Merge pull request #60 from timvisee/master

Added intelligent command manager and help system

pom.xml

@@ -502,5 +502,12 @@
 			<optional>true</optional>
 		</dependency>
 
+        <!-- String comparison library. Used for dynamic help system. -->
+        <dependency>
+            <groupId>net.ricecode</groupId>
+            <artifactId>string-similarity</artifactId>
+            <version>1.0.0</version>
+        </dependency>
+
 	</dependencies>
 </project>

src/main/java/fr/xephi/authme/AuthMe.java

@@ -11,11 +11,13 @@ import java.util.List;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.logging.Logger;
 
+import fr.xephi.authme.command.CommandHandler;
 import org.apache.logging.log4j.LogManager;
 import org.bukkit.Bukkit;
 import org.bukkit.Location;
 import org.bukkit.Server;
 import org.bukkit.World;
+import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
 import org.bukkit.plugin.PluginManager;
@@ -73,10 +75,21 @@ import net.minelink.ctplus.CombatTagPlus;
 
 public class AuthMe extends JavaPlugin {
 
+    /** Defines the name of the plugin. */
+    // TODO: Create a getter method for this constant, and make it private
+    public static final String PLUGIN_NAME = "AuthMeReloaded";
+    /** Defines the current AuthMeReloaded version name. */
+    private static final String PLUGIN_VERSION_NAME = "5.1-SNAPSHOT";
+    /** Defines the current AuthMeReloaded version code. */
+    private static final int PLUGIN_VERSION_CODE = 100; // Increase this number by one when an update is released
+
     private static AuthMe authme;
     private static Server server;
     private Logger authmeLogger;
 
+    // TODO: Move this to a better place! -- timvisee
+    private CommandHandler commandHandler = null;
+
     public Management management;
     public NewAPI api;
     public SendMailSSL mail;
@@ -140,6 +153,10 @@ public class AuthMe extends JavaPlugin {
         authmeLogger = Logger.getLogger("AuthMe");
         authme = this;
 
+        // Set up and initialize the command handler
+        this.commandHandler = new CommandHandler(false);
+        this.commandHandler.init();
+
         // TODO: split the plugin in more modules
         moduleManager = new ModuleManager(this);
         @SuppressWarnings("unused")
@@ -327,16 +344,17 @@ public class AuthMe extends JavaPlugin {
         pm.registerEvents(new AuthMeEntityListener(this), this);
         pm.registerEvents(new AuthMeServerListener(this), this);
 
+        // TODO: This is moved to CommandManager.registerCommands() handled by AuthMe.onCommand() -- timvisee
         // Register commands
-        getCommand("authme").setExecutor(new AdminCommand(this));
-        getCommand("register").setExecutor(new RegisterCommand(this));
-        getCommand("login").setExecutor(new LoginCommand(this));
-        getCommand("changepassword").setExecutor(new ChangePasswordCommand(this));
-        getCommand("logout").setExecutor(new LogoutCommand(this));
-        getCommand("unregister").setExecutor(new UnregisterCommand(this));
-        getCommand("email").setExecutor(new EmailCommand(this));
-        getCommand("captcha").setExecutor(new CaptchaCommand(this));
-        getCommand("converter").setExecutor(new ConverterCommand(this));
+        //getCommand("authme").setExecutor(new AdminCommand(this));
+        //getCommand("register").setExecutor(new RegisterCommand(this));
+        //getCommand("login").setExecutor(new LoginCommand(this));
+        //getCommand("changepassword").setExecutor(new ChangePasswordCommand(this));
+        //getCommand("logout").setExecutor(new LogoutCommand(this));
+        //getCommand("unregister").setExecutor(new UnregisterCommand(this));
+        //getCommand("email").setExecutor(new EmailCommand(this));
+        //getCommand("captcha").setExecutor(new CaptchaCommand(this));
+        //getCommand("converter").setExecutor(new ConverterCommand(this));
 
         // Purge on start if enabled
         autoPurge();
@@ -703,6 +721,10 @@ public class AuthMe extends JavaPlugin {
         Settings.switchAntiBotMod(mode);
     }
 
+    public boolean getAntiBotModMode() {
+        return this.antibotMod;
+    }
+
     private void recallEmail() {
         if (!Settings.recallEmail)
             return;
@@ -808,4 +830,52 @@ public class AuthMe extends JavaPlugin {
     public String getCountryName(String ip) {
         return Utils.getCountryName(ip);
     }
+
+    /**
+     * Get the command handler instance.
+     *
+     * @return Command handler.
+     */
+    public CommandHandler getCommandHandler() {
+        return this.commandHandler;
+    }
+
+    /**
+     * Handle Bukkit commands.
+     *
+     * @param sender The command sender (Bukkit).
+     * @param cmd The command (Bukkit).
+     * @param commandLabel The command label (Bukkit).
+     * @param args The command arguments (Bukkit).
+     *
+     * @return True if the command was executed, false otherwise.
+     */
+    @Override
+    public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String[] args) {
+        // Get the command handler, and make sure it's valid
+        CommandHandler commandHandler = this.getCommandHandler();
+        if(commandHandler == null)
+            return false;
+
+        // Handle the command, return the result
+        return commandHandler.onCommand(sender, cmd, commandLabel, args);
+    }
+
+    /**
+     * Get the current installed AuthMeReloaded version name.
+     *
+     * @return The version name of the currently installed AuthMeReloaded instance.
+     */
+    public static String getVersionName() {
+        return PLUGIN_VERSION_NAME;
+    }
+
+    /**
+     * Get the current installed AuthMeReloaded version code.
+     *
+     * @return The version code of the currently installed AuthMeReloaded instance.
+     */
+    public static int getVersionCode() {
+        return PLUGIN_VERSION_CODE;
+    }
 }

src/main/java/fr/xephi/authme/SendMailSSL.java

@@ -112,10 +112,10 @@ public class SendMailSSL {
                     if (file != null)
                         file.delete();
 
-                } catch (RuntimeException e) {
-                    ConsoleLogger.showError("Some error occured while trying to send a email to " + mail);
-                } catch (Exception e) {
-                    ConsoleLogger.showError("Some error occured while trying to send a email to " + mail);
+                } catch(Exception e) {
+                    // Print the stack trace
+                    e.printStackTrace();
+                    ConsoleLogger.showError("Some error occurred while trying to send a email to " + mail);
                 }
             }
 

src/main/java/fr/xephi/authme/command/CommandArgumentDescription.java

@@ -0,0 +1,91 @@
+package fr.xephi.authme.command;
+
+public class CommandArgumentDescription {
+
+    // TODO: Allow argument to consist of infinite parts. <label ...>
+
+    /** Argument label. */
+    private String label;
+    /** Argument description. */
+    private String description;
+    /** Defines whether the argument is optional. */
+    private boolean optional = false;
+
+    /**
+     * Constructor.
+     *
+     * @param label The argument label.
+     * @param description The argument description.
+     */
+    @SuppressWarnings("UnusedDeclaration")
+    public CommandArgumentDescription(String label, String description) {
+        this(label, description, false);
+    }
+
+    /**
+     * Constructor.
+     *
+     * @param label The argument label.
+     * @param description The argument description.
+     * @param optional True if the argument is optional, false otherwise.
+     */
+    public CommandArgumentDescription(String label, String description, boolean optional) {
+        setLabel(label);
+        setDescription(description);
+        setOptional(optional);
+    }
+
+    /**
+     * Get the argument label.
+     *
+     * @return Argument label.
+     */
+    public String getLabel() {
+        return this.label;
+    }
+
+    /**
+     * Set the argument label.
+     *
+     * @param label Argument label.
+     */
+    public void setLabel(String label) {
+        this.label = label;
+    }
+
+    /**
+     * Get the argument description.
+     *
+     * @return Argument description.
+     */
+    public String getDescription() {
+        return description;
+    }
+
+    /**
+     * Set the argument description.
+     *
+     * @param description Argument description.
+     */
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    /**
+     * Check whether the argument is optional.
+     *
+     * @return True if the argument is optional, false otherwise.
+     */
+    public boolean isOptional() {
+        return optional;
+    }
+
+    /**
+     * Set whether the argument is optional.
+     *
+     * @param optional True if the argument is optional, false otherwise.
+     */
+    public void setOptional(boolean optional) {
+        this.optional = optional;
+    }
+}

src/main/java/fr/xephi/authme/command/CommandDescription.java

@@ -0,0 +1,918 @@
+package fr.xephi.authme.command;
+
+import fr.xephi.authme.util.StringUtils;
+import org.bukkit.command.CommandSender;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+
+@SuppressWarnings("UnusedDeclaration")
+public class CommandDescription {
+
+    /** Defines the acceptable labels. */
+    private List<String> labels = new ArrayList<>();
+    /** Command description. */
+    private String description = "";
+    /** Detailed description. */
+    private String detailedDescription = "";
+    /** The executable command instance. */
+    private ExecutableCommand executableCommand;
+    /** The parent command. */
+    private CommandDescription parent = null;
+    /** The child labels. */
+    private List<CommandDescription> children = new ArrayList<>();
+    /** The command arguments. */
+    private List<CommandArgumentDescription> arguments = new ArrayList<>();
+    /** Defines whether there is an argument maximum or not. */
+    private boolean noArgumentMaximum = false;
+    /** Defines the command permissions. */
+    private CommandPermissions permissions = new CommandPermissions();
+
+    /**
+     * Constructor.
+     *
+     * @param executableCommand The executable command, or null.
+     * @param label Command label.
+     * @param description Command description.
+     * @param detailedDescription Detailed comment description.
+     * @param parent Parent command.
+     */
+    public CommandDescription(ExecutableCommand executableCommand, String label, String description, String detailedDescription, CommandDescription parent) {
+        this(executableCommand, label, description, parent, detailedDescription, null);
+    }
+
+    /**
+     * Constructor.
+     *
+     * @param executableCommand The executable command, or null.
+     * @param labels List of command labels.
+     * @param description Command description.
+     * @param detailedDescription Detailed comment description.
+     * @param parent Parent command.
+     */
+    public CommandDescription(ExecutableCommand executableCommand, List<String> labels, String description, String detailedDescription, CommandDescription parent) {
+        this(executableCommand, labels, description, detailedDescription, parent, null);
+    }
+
+    /**
+     * Constructor.
+     *
+     * @param executableCommand The executable command, or null.
+     * @param label Command label.
+     * @param description Command description.
+     * @param parent Parent command.
+     * @param detailedDescription Detailed comment description.
+     * @param arguments Command arguments.
+     */
+    public CommandDescription(ExecutableCommand executableCommand, String label, String description, CommandDescription parent, String detailedDescription, List<CommandArgumentDescription> arguments) {
+        setExecutableCommand(executableCommand);
+        setLabel(label);
+        setDescription(description);
+        setDetailedDescription(detailedDescription);
+        setParent(parent);
+        setArguments(arguments);
+    }
+
+    /**
+     * Constructor.
+     *
+     * @param executableCommand The executable command, or null.
+     * @param labels List of command labels.
+     * @param description Command description.
+     * @param detailedDescription Detailed comment description.
+     * @param parent Parent command.
+     * @param arguments Command arguments.
+     */
+    public CommandDescription(ExecutableCommand executableCommand, List<String> labels, String description, String detailedDescription, CommandDescription parent, List<CommandArgumentDescription> arguments) {
+        setExecutableCommand(executableCommand);
+        setLabels(labels);
+        setDescription(description);
+        setDetailedDescription(detailedDescription);
+        setParent(parent);
+        setArguments(arguments);
+    }
+
+    /**
+     * Get the first relative command label.
+     *
+     * @return First relative command label.
+     */
+    public String getLabel() {
+        // Ensure there's any item in the command list
+        if(this.labels.size() == 0)
+            return "";
+
+        // Return the first command on the list
+        return this.labels.get(0);
+    }
+
+    /**
+     * Get the label most similar to the reference. The first label will be returned if no reference was supplied.
+     *
+     * @param reference The command reference.
+     *
+     * @return The most similar label, or the first label. An empty label will be returned if no label was set.
+     */
+    public String getLabel(CommandParts reference) {
+        // Ensure there's any item in the command list
+        if(this.labels.size() == 0)
+            return "";
+
+        // Return the first label if we can't use the reference
+        if(reference == null)
+            return this.labels.get(0);
+
+        // Get the correct label from the reference
+        String preferred = reference.get(getParentCount());
+
+        // Check whether the preferred label is in the label list
+        double currentDifference = -1;
+        String currentLabel = this.labels.get(0);
+        for(String entry : this.labels) {
+            double entryDifference = StringUtils.getDifference(entry, preferred);
+            if(entryDifference < currentDifference || currentDifference < 0) {
+                currentDifference = entryDifference;
+                currentLabel = entry;
+            }
+        }
+
+        // Return the most similar label
+        return currentLabel;
+    }
+
+    /**
+     * Get all relative command labels.
+     *
+     * @return All relative labels labels.
+     */
+    public List<String> getLabels() {
+        return this.labels;
+    }
+
+    /**
+     * Set the list of command labels.
+     *
+     * @param labels New list of command labels. Null to clear the list of labels.
+     */
+    public void setLabels(List<String> labels) {
+        // Check whether the command label list should be cleared
+        if(labels == null)
+            this.labels.clear();
+
+        else
+            this.labels = labels;
+    }
+
+    /**
+     * Set the command label, this will append the command label to already existing ones.
+     *
+     * @param commandLabel Command label to set or add.
+     */
+    public void setLabel(String commandLabel) {
+        setLabel(commandLabel, false);
+    }
+
+    /**
+     * Set the command label.
+     *
+     * @param commandLabel Command label to set.
+     * @param overwrite True to replace all old command labels, false to append this command label to the currently
+     *                  existing labels.
+     *
+     * @return Trie if the command label is added, or if it was added already. False on failure.
+     */
+    public boolean setLabel(String commandLabel, boolean overwrite) {
+        // Check whether this new command should overwrite the previous ones
+        if(!overwrite)
+            return addLabel(commandLabel);
+
+        // Replace all labels with this new one
+        this.labels.clear();
+        return this.labels.add(commandLabel);
+    }
+
+    /**
+     * Add a command label to the list.
+     *
+     * @param commandLabel Command label to add.
+     *
+     * @return True if the label was added, or if it was added already. False on error.
+     */
+    public boolean addLabel(String commandLabel) {
+        // Verify the label
+        if(!isValidLabel(commandLabel))
+            return false;
+
+        // Ensure this command isn't a duplicate
+        if(hasLabel(commandLabel))
+            return true;
+
+        // Add the command to the list
+        return this.labels.add(commandLabel);
+    }
+
+    /**
+     * Add a list of command labels.
+     *
+     * @param commandLabels List of command labels to add.
+     *
+     * @return True if succeed, false on failure.
+     */
+    public boolean addLabels(List<String> commandLabels) {
+        // Add each command label separately
+        for(String cmd : commandLabels)
+            if(!addLabel(cmd))
+                return false;
+        return true;
+    }
+
+    /**
+     * Check whether this command description has a specific command.
+     *
+     * @param commandLabel Command to check for.
+     *
+     * @return True if this command label equals to the param command.
+     */
+    public boolean hasLabel(String commandLabel) {
+        // Check whether any command matches with the argument
+        for(String entry : this.labels)
+            if(commandLabelEquals(entry, commandLabel))
+                return true;
+
+        // No match found, return false
+        return false;
+    }
+
+    /**
+     * Check whether this command description has a list of labels
+     * @param commandLabels List of labels
+     * @return True if all labels match, false otherwise
+     */
+    public boolean hasLabels(List<String> commandLabels) {
+        // Check if there's a match for every command
+        for(String cmd : commandLabels)
+            if(!hasLabel(cmd))
+                return false;
+
+        // There seems to be a match for every command, return true
+        return true;
+    }
+
+    /**
+     * Check whether this command label is applicable with a command reference. This doesn't check if the parent
+     * are suitable too.
+     *
+     * @param commandReference The command reference.
+     *
+     * @return True if the command reference is suitable to this command label, false otherwise.
+     */
+    public boolean isSuitableLabel(CommandParts commandReference) {
+        // Make sure the command reference is valid
+        if(commandReference.getCount() <= 0)
+            return false;
+
+        // Get the parent count
+        String element = commandReference.get(getParentCount());
+
+        // Check whether this command description has this command label
+        return hasLabel(element);
+    }
+
+    /**
+     * Check whether a label is valid to use.
+     *
+     * @param label The label to test.
+     *
+     * @return True if the label is valid to use, false otherwise.
+     */
+    public static boolean isValidLabel(String label) {
+        // Make sure the label isn't null
+        if(label == null)
+            return false;
+
+        // Trim the label
+        label = label.trim();
+
+        // Make sure the label is at least one character long
+        if(label.length() <= 0)
+            return false;
+
+        // Make sure the label doesn't contain any spaces, return the result
+        return !label.contains(" ");
+    }
+
+    /**
+     * Get the absolute command label, without a slash.
+     */
+    public String getAbsoluteLabel() {
+        return getAbsoluteLabel(false);
+    }
+
+    /**
+     * Get the absolute command label.
+     *
+     * @return Absolute command label.
+     */
+    public String getAbsoluteLabel(boolean includeSlash) {
+        return getAbsoluteLabel(includeSlash, null);
+    }
+
+    /**
+     * Get the absolute command label.
+     *
+     * @return Absolute command label.
+     */
+    public String getAbsoluteLabel(boolean includeSlash, CommandParts reference) {
+        // Get the command reference, and make sure it is valid
+        CommandParts out = getCommandReference(reference);
+        if(out == null)
+            return "";
+
+        // Return the result
+        return (includeSlash ? "/" : "") + out.toString();
+    }
+
+    /**
+     * Get the command reference.
+     *
+     * @param reference The reference to use as template, which is used to choose the most similar reference.
+     *
+     * @return Command reference.
+     */
+    public CommandParts getCommandReference(CommandParts reference) {
+        // Build the reference
+        List<String> referenceList = new ArrayList<>();
+
+        // Check whether this command has a parent, if so, add the absolute parent command
+        if(getParent() != null)
+            referenceList.addAll(getParent().getCommandReference(reference).getList());
+
+        // Get the current label
+        referenceList.add(getLabel(reference));
+
+        // Return the reference
+        return new CommandParts(referenceList);
+    }
+
+    /**
+     * Get the difference between this command and another command reference.
+     *
+     * @param other The other command reference.
+     *
+     * @return The command difference. Zero if there's no difference. A negative number on error.
+     */
+    public double getCommandDifference(CommandParts other) {
+        return getCommandDifference(other, false);
+    }
+
+    /**
+     * Get the difference between this command and another command reference.
+     *
+     * @param other The other command reference.
+     * @param fullCompare True to fully compare both command references.
+     *
+     * @return The command difference. Zero if there's no difference. A negative number on error.
+     */
+    public double getCommandDifference(CommandParts other, boolean fullCompare) {
+        // Make sure the reference is valid
+        if(other == null)
+            return -1;
+
+        // Get the command reference
+        CommandParts reference = getCommandReference(other);
+
+        // Compare the two references, return the result
+        return reference.getDifference(new CommandParts(other.getRange(0, reference.getCount())), fullCompare);
+    }
+
+    /**
+     * Get the executable command.
+     *
+     * @return The executable command.
+     */
+    public ExecutableCommand getExecutableCommand() {
+        return this.executableCommand;
+    }
+
+    /**
+     * Set the executable command.
+     *
+     * @param executableCommand The executable command.
+     */
+    public void setExecutableCommand(ExecutableCommand executableCommand) {
+        this.executableCommand = executableCommand;
+    }
+
+    /**
+     * Check whether this command is executable, based on the assigned executable command.
+     *
+     * @return True if this command is executable.
+     */
+    public boolean isExecutable() {
+        return this.executableCommand != null;
+    }
+
+    /**
+     * Execute the command, if possible.
+     *
+     * @param sender The command sender that triggered the execution of this command.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True on success, false on failure.
+     */
+    public boolean execute(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // Make sure the command is executable
+        if(!isExecutable())
+            return false;
+
+        // Execute the command, return the result
+        return getExecutableCommand().executeCommand(sender, commandReference, commandArguments);
+    }
+
+    /**
+     * Get the parent command if this command description has a parent.
+     *
+     * @return Parent command, or null
+     */
+    public CommandDescription getParent() {
+        return this.parent;
+    }
+
+    /**
+     * Get the number of parent this description has.
+     *
+     * @return The number of parents.
+     */
+    public int getParentCount() {
+        // Check whether the this description has a parent
+        if(!hasParent())
+            return 0;
+
+        // Get the parent count of the parent, return the result
+        return getParent().getParentCount() + 1;
+    }
+
+    /**
+     * Set the parent command.
+     *
+     * @param parent Parent command.
+     *
+     * @return True on success, false on failure.
+     */
+    public boolean setParent(CommandDescription parent) {
+        // Make sure the parent is different
+        if(this.parent == parent)
+            return true;
+
+        // Set the parent
+        this.parent = parent;
+
+        // Make sure the parent isn't null
+        if(parent == null)
+            return true;
+
+        // Add this description as a child to the parent
+        return parent.addChild(this);
+    }
+
+    /**
+     * Check whether the plugin description has a parent command.
+     *
+     * @return True if the description has a parent command, false otherwise.
+     */
+    public boolean hasParent() {
+        return this.parent != null;
+    }
+
+    /**
+     * Get all command children.
+     *
+     * @return Command children.
+     */
+    public List<CommandDescription> getChildren() {
+        return this.children;
+    }
+
+    /**
+     * Add a child to the command description.
+     *
+     * @param commandDescription The child to add.
+     *
+     * @return True on success, false on failure.
+     */
+    public boolean addChild(CommandDescription commandDescription) {
+        // Make sure the description is valid
+        if(commandDescription == null)
+            return false;
+        if(!commandDescription.isValid())
+            return false;
+
+        // Make sure the child doesn't exist already
+        if(isChild(commandDescription))
+            return true;
+
+        // The command description to add as a child
+        if(!this.children.add(commandDescription))
+            return false;
+
+        // Set this description as parent on the child
+        return commandDescription.setParent(this);
+    }
+
+    /**
+     * Set the children of this command.
+     *
+     * @param children New command children. Null to remove all children.
+     */
+    public void setChildren(List<CommandDescription> children) {
+        // Check whether the children list should be cleared
+        if(children == null)
+            this.children.clear();
+
+        else
+            this.children = children;
+    }
+
+    /**
+     * Check whether this command has any child labels.
+     *
+     * @return True if this command has any child labels.
+     */
+    public boolean hasChilds() {
+        return (this.children.size() != 0);
+    }
+
+    /**
+     * Check if this command description has a specific child.
+     *
+     * @param commandDescription The command description to check for.
+     *
+     * @return True if this command description has the specific child, false otherwise.
+     */
+    public boolean isChild(CommandDescription commandDescription) {
+        // Make sure the description is valid
+        if(commandDescription == null)
+            return false;
+        if(!commandDescription.isValid())
+            return false;
+
+        // Check whether this child exists, return the result
+        return this.children.contains(commandDescription);
+    }
+
+    /**
+     * Add an argument.
+     *
+     * @param argument The argument to add.
+     *
+     * @return True if succeed, false if failed.
+     */
+    public boolean addArgument(CommandArgumentDescription argument) {
+        // Make sure the argument is valid
+        if(argument == null)
+            return false;
+
+        // Make sure the argument isn't added already
+        if(hasArgument(argument))
+            return true;
+
+        // Add the argument, return the result
+        return this.arguments.add(argument);
+    }
+
+    /**
+     * Get all command arguments.
+     *
+     * @return Command arguments.
+     */
+    public List<CommandArgumentDescription> getArguments() {
+        return this.arguments;
+    }
+
+    /**
+     * Set the arguments of this command.
+     *
+     * @param arguments New command arguments. Null to clear the list of arguments.
+     */
+    public void setArguments(List<CommandArgumentDescription> arguments) {
+        // Convert null into an empty argument list
+        if(arguments == null)
+            this.arguments.clear();
+
+        else
+            this.arguments = arguments;
+    }
+
+    /**
+     * Check whether an argument exists.
+     *
+     * @param argument The argument to check for.
+     *
+     * @return True if this argument already exists, false otherwise.
+     */
+    public boolean hasArgument(CommandArgumentDescription argument) {
+        // Make sure the argument is valid
+        if(argument == null)
+            return false;
+
+        // Check whether the argument exists, return the result
+        return this.arguments.contains(argument);
+    }
+
+    /**
+     * Check whether this command has any arguments.
+     *
+     * @return True if this command has any arguments.
+     */
+    public boolean hasArguments() {
+        return (this.arguments.size() != 0);
+    }
+
+    /**
+     * The minimum number of arguments required for this command.
+     *
+     * @return The minimum number of required arguments.
+     */
+    public int getMinimumArguments() {
+        // Get the number of required and optional arguments
+        int requiredArguments = 0;
+        int optionalArgument = 0;
+
+        // Loop through each argument
+        for(CommandArgumentDescription argument : this.arguments) {
+            // Check whether the command is optional
+            if(!argument.isOptional()) {
+                requiredArguments += optionalArgument + 1;
+                optionalArgument = 0;
+
+            } else
+                optionalArgument++;
+        }
+
+        // Return the number of required arguments
+        return requiredArguments;
+    }
+
+    /**
+     * Get the maximum number of arguments.
+     *
+     * @return The maximum number of arguments. A negative number will be returned if there's no maximum.
+     */
+    public int getMaximumArguments() {
+        // Check whether there is a maximum set
+        if(this.noArgumentMaximum)
+            return -1;
+
+        // Return the maximum based on the registered arguments
+        return this.arguments.size();
+    }
+
+    /**
+     * Set whether there is an argument maximum.
+     *
+     * @param maximumArguments True if there is an argument maximum, based on the number of registered arguments.
+     */
+    public void setMaximumArguments(boolean maximumArguments) {
+        this.noArgumentMaximum = !maximumArguments;
+    }
+
+    /**
+     * Get the command description.
+     *
+     * @return Command description.
+     */
+    public String getDescription() {
+        return hasDescription() ? this.description : this.detailedDescription;
+    }
+
+    /**
+     * Set the command description.
+     *
+     * @param description New command description. Null to reset the description.
+     */
+    public void setDescription(String description) {
+        if(description == null)
+            this.description = "";
+
+        else
+            this.description = description;
+    }
+
+    /**
+     * Check whether this command has any description.
+     *
+     * @return True if this command has any description.
+     */
+    public boolean hasDescription() {
+        return (this.description.trim().length() != 0);
+    }
+
+    /**
+     * Get the command detailed description.
+     *
+     * @return Command detailed description.
+     */
+    public String getDetailedDescription() {
+        return hasDetailedDescription() ? this.detailedDescription : this.description;
+    }
+
+    /**
+     * Set the command detailed description.
+     *
+     * @param detailedDescription New command description. Null to reset the description.
+     */
+    public void setDetailedDescription(String detailedDescription) {
+        if(detailedDescription == null)
+            this.detailedDescription = "";
+
+        else
+            this.detailedDescription = detailedDescription;
+    }
+
+    /**
+     * Check whether this command has any detailed description.
+     *
+     * @return True if this command has any detailed description.
+     */
+    public boolean hasDetailedDescription() {
+        return (this.detailedDescription.trim().length() != 0);
+    }
+
+    /**
+     * Find the best suitable command for a query reference.
+     *
+     * @param queryReference The query reference to find a command for.
+     *
+     * @return The command found, or null.
+     */
+    public FoundCommandResult findCommand(final CommandParts queryReference) {
+        // Make sure the command reference is valid
+        if(queryReference.getCount() <= 0)
+            return null;
+
+        // Check whether this description is for the last element in the command reference, if so return the current command
+        if(queryReference.getCount() <= getParentCount() + 1)
+            return new FoundCommandResult(
+                    this,
+                    getCommandReference(queryReference),
+                    new CommandParts(),
+                    queryReference);
+
+        // Get the new command reference and arguments
+        CommandParts newReference = new CommandParts(queryReference.getRange(0, getParentCount() + 1));
+        CommandParts newArguments = new CommandParts(queryReference.getRange(getParentCount() + 1));
+
+        // Handle the child's, if this command has any
+        if(getChildren().size() > 0) {
+            // Get a new instance of the child's list, and sort them by their difference in comparison to the query reference
+            List<CommandDescription> commandChildren = new ArrayList<>(getChildren());
+            Collections.sort(commandChildren, new Comparator<CommandDescription>() {
+                @Override
+                public int compare(CommandDescription o1, CommandDescription o2) {
+                    return Double.compare(
+                            o1.getCommandDifference(queryReference),
+                            o2.getCommandDifference(queryReference));
+                }
+            });
+
+            // Get the difference of the first child in the list
+            double firstChildDifference = commandChildren.get(0).getCommandDifference(queryReference, true);
+
+            // Check if the reference perfectly suits the arguments of the current command if it doesn't perfectly suits a child command
+            if(firstChildDifference > 0.0)
+                if(getSuitableArgumentsDifference(queryReference) == 0)
+                    return new FoundCommandResult(this, newReference, newArguments, queryReference);
+
+            // Loop through each child
+            for(CommandDescription child : commandChildren) {
+                // Get the best suitable command
+                FoundCommandResult result = child.findCommand(queryReference);
+                if(result != null)
+                    return result;
+            }
+        }
+
+        // Check if the remaining command reference elements fit the arguments for this command
+        if(getSuitableArgumentsDifference(queryReference) >= 0)
+            return new FoundCommandResult(this, newReference, newArguments, queryReference);
+
+        // No command found, return null
+        return null;
+    }
+
+    /**
+     * Check whether there's any command description that matches the specified command reference.
+     *
+     * @param commandReference The command reference.
+     *
+     * @return True if so, false otherwise.
+     */
+    public boolean hasSuitableCommand(CommandParts commandReference) {
+        return findCommand(commandReference) != null;
+    }
+
+    /**
+     * Check if the remaining command reference elements are suitable with arguments of the current command description.
+     *
+     * @param commandReference The command reference.
+     *
+     * @return True if the arguments are suitable, false otherwise.
+     */
+    public boolean hasSuitableArguments(CommandParts commandReference) {
+        return getSuitableArgumentsDifference(commandReference) == 0;
+    }
+
+    /**
+     * Check if the remaining command reference elements are suitable with arguments of the current command description,
+     * and get the difference in argument count.
+     *
+     * @param commandReference The command reference.
+     *
+     * @return The difference in argument count between the reference and the actual command.
+     */
+    public int getSuitableArgumentsDifference(CommandParts commandReference) {
+        // Make sure the command reference is valid
+        if(commandReference.getCount() <= 0)
+            return -1;
+
+        // Get the remaining command reference element count
+        int remainingElementCount = commandReference.getCount() - getParentCount() - 1;
+
+        // Check if there are too less arguments
+        if(getMinimumArguments() > remainingElementCount)
+            return Math.abs(getMinimumArguments() - remainingElementCount);
+
+        // Check if there are too many arguments
+        if(getMaximumArguments() < remainingElementCount && getMaximumArguments() >= 0)
+            return Math.abs(remainingElementCount - getMaximumArguments());
+
+        // The arguments seem to be EQUALS, return the result
+        return 0;
+    }
+
+    /**
+     * Get the command permissions.
+     *
+     * @return The command permissions.
+     */
+    public CommandPermissions getCommandPermissions() {
+        return this.permissions;
+    }
+
+    /**
+     * Set the command permissions.
+     *
+     * @param commandPermissions The command permissions.
+     */
+    public void setCommandPermissions(CommandPermissions commandPermissions) {
+        this.permissions = commandPermissions;
+    }
+
+    /**
+     * Set the command permissions.
+     *
+     * @param permissionNode The permission node required.
+     * @param defaultPermission The default permission.
+     */
+    public void setCommandPermissions(String permissionNode, CommandPermissions.DefaultPermission defaultPermission) {
+        this.permissions = new CommandPermissions(permissionNode, defaultPermission);
+    }
+
+    /**
+     * Check whether two labels equal to each other.
+     *
+     * @param commandLabel The first command label.
+     * @param otherCommandLabel The other command label.
+     *
+     * @return True if the labels are equal to each other.
+     */
+    private static boolean commandLabelEquals(String commandLabel, String otherCommandLabel) {
+        // Trim the command labels from unwanted whitespaces
+        commandLabel = commandLabel.trim();
+        otherCommandLabel = otherCommandLabel.trim();
+
+        // Check whether the the two command labels are equal (case insensitive)
+        return (commandLabel.equalsIgnoreCase(otherCommandLabel));
+    }
+
+    /**
+     * Check whether the command description has been set up properly.
+     *
+     * @return True if the command description is valid, false otherwise.
+     */
+    public boolean isValid() {
+        // Make sure any command label is set
+        if(getLabels().size() == 0)
+            return false;
+
+        // Make sure the permissions are set up properly
+        if(this.permissions == null)
+            return false;
+
+        // Everything seems to be correct, return the result
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/CommandHandler.java

@@ -0,0 +1,207 @@
+package fr.xephi.authme.command;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.command.help.HelpProvider;
+import org.bukkit.ChatColor;
+import org.bukkit.command.CommandSender;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+public class CommandHandler {
+
+    /** The command manager instance. */
+    private CommandManager commandManager;
+
+    /**
+     * Constructor.
+     *
+     * @param init True to immediately initialize.
+     */
+    public CommandHandler(boolean init) {
+        // Initialize
+        if(init)
+            init();
+    }
+
+    /**
+     * Initialize the command handler.
+     *
+     * @return True if succeed, false on failure. True will also be returned if the command handler was already
+     * initialized.
+     */
+    public boolean init() {
+        // Make sure the handler isn't initialized already
+        if(isInit())
+            return true;
+
+        // Initialize the command manager
+        this.commandManager = new CommandManager(false);
+        this.commandManager.registerCommands();
+
+        // Return the result
+        return true;
+    }
+
+    /**
+     * Check whether the command handler is initialized.
+     *
+     * @return True if the command handler is initialized.
+     */
+    public boolean isInit() {
+        return this.commandManager != null;
+    }
+
+    /**
+     * Destroy the command handler.
+     *
+     * @return True if the command handler was destroyed successfully, false otherwise. True will also be returned if
+     * the command handler wasn't initialized.
+     */
+    public boolean destroy() {
+        // Make sure the command handler is initialized
+        if(!isInit())
+            return true;
+
+        // Unset the command manager
+        this.commandManager = null;
+        return true;
+    }
+
+    /**
+     * Get the command manager.
+     *
+     * @return Command manager instance.
+     */
+    public CommandManager getCommandManager() {
+        return this.commandManager;
+    }
+
+    /**
+     * Process a command.
+     *
+     * @param sender The command sender (Bukkit).
+     * @param bukkitCommand The command (Bukkit).
+     * @param bukkitCommandLabel The command label (Bukkit).
+     * @param bukkitArgs The command arguments (Bukkit).
+     *
+     * @return True if the command was executed, false otherwise.
+     */
+    @SuppressWarnings("unused")
+    public boolean onCommand(CommandSender sender, @SuppressWarnings("UnusedParameters") org.bukkit.command.Command bukkitCommand, String bukkitCommandLabel, String[] bukkitArgs) {
+        // Process the arguments
+        List<String> args = processArguments(bukkitArgs);
+
+        // Create a command reference, and make sure at least one command part is available
+        CommandParts commandReference = new CommandParts(bukkitCommandLabel, args);
+        if(commandReference.getCount() == 0)
+            return false;
+
+        // Get a suitable command for this reference, and make sure it isn't null
+        FoundCommandResult result = this.commandManager.findCommand(commandReference);
+        if(result == null) {
+            sender.sendMessage(ChatColor.DARK_RED + "Failed to parse " + AuthMe.PLUGIN_NAME + " command!");
+            return false;
+        }
+
+        // Get the base command
+        String baseCommand = commandReference.get(0);
+
+        // Make sure the difference between the command reference and the actual command isn't too big
+        final double commandDifference = result.getDifference();
+        if(commandDifference > 0.12) {
+            // Show the unknown command warning
+            sender.sendMessage(ChatColor.DARK_RED + "Unknown command!");
+
+            // Show a command suggestion if available and the difference isn't too big
+            if(commandDifference < 0.75)
+                if(result.getCommandDescription() != null)
+                    sender.sendMessage(ChatColor.YELLOW + "Did you mean " + ChatColor.GOLD + "/" + result.getCommandDescription().getCommandReference(commandReference) + ChatColor.YELLOW + "?");
+
+            // Show the help command
+            sender.sendMessage(ChatColor.YELLOW + "Use the command " + ChatColor.GOLD + "/" + baseCommand + " help" + ChatColor.YELLOW + " to view help.");
+            return true;
+        }
+
+        // Show a message when the command handler is assuming a command
+        if(commandDifference > 0) {
+            // Get the suggested command
+            CommandParts suggestedCommandParts = new CommandParts(result.getCommandDescription().getCommandReference(commandReference));
+
+            // Show the suggested command
+            sender.sendMessage(ChatColor.DARK_RED + "Unknown command, assuming " + ChatColor.GOLD + "/" + suggestedCommandParts +
+                    ChatColor.DARK_RED + "!");
+        }
+
+        // Make sure the command is executable
+        if(!result.isExecutable()) {
+            // Get the command reference
+            CommandParts helpCommandReference = new CommandParts(result.getCommandReference().getRange(1));
+
+            // Show the unknown command warning
+            sender.sendMessage(ChatColor.DARK_RED + "Invalid command!");
+
+            // Show the help command
+            sender.sendMessage(ChatColor.YELLOW + "Use the command " + ChatColor.GOLD + "/" + baseCommand + " help " + helpCommandReference + ChatColor.YELLOW + " to view help.");
+            return true;
+        }
+
+        // Make sure the command sender has permission
+        if(!result.hasPermission(sender)) {
+            // Show the no permissions warning
+            sender.sendMessage(ChatColor.DARK_RED + "You don't have permission to use this command!");
+            return true;
+        }
+
+        // Make sure the command sender has permission
+        if(!result.hasProperArguments()) {
+            // Get the command and the suggested command reference
+            CommandParts suggestedCommandReference = new CommandParts(result.getCommandDescription().getCommandReference(commandReference));
+            CommandParts helpCommandReference = new CommandParts(suggestedCommandReference.getRange(1));
+
+            // Show the invalid arguments warning
+            sender.sendMessage(ChatColor.DARK_RED + "Incorrect command arguments!");
+
+            // Show the command argument help
+            HelpProvider.showHelp(sender, commandReference, suggestedCommandReference, true, false, true, false, false, false);
+
+            // Show the command to use for detailed help
+            sender.sendMessage(ChatColor.GOLD + "Detailed help: " + ChatColor.WHITE + "/" + baseCommand + " help " + helpCommandReference);
+            return true;
+        }
+
+        // Execute the command if it's suitable
+        return result.executeCommand(sender);
+    }
+
+    /**
+     * Process the command arguments, and return them as an array list.
+     *
+     * @param args The command arguments to process.
+     *
+     * @return The processed command arguments.
+     */
+    private List<String> processArguments(String[] args) {
+        // Convert the array into a list of arguments
+        List<String> arguments = new ArrayList<>(Arrays.asList(args));
+
+        /// Remove all empty arguments
+        for(int i = 0; i < arguments.size(); i++) {
+            // Get the argument value
+            final String arg = arguments.get(i);
+
+            // Check whether the argument value is empty
+            if(arg.trim().length() == 0) {
+                // Remove the current argument
+                arguments.remove(i);
+
+                // Decrease the index by one, continue to the next argument
+                i--;
+            }
+        }
+
+        // Return the argument
+        return arguments;
+    }
+}

src/main/java/fr/xephi/authme/command/CommandManager.java

@@ -0,0 +1,667 @@
+package fr.xephi.authme.command;
+
+import fr.xephi.authme.command.executable.*;
+import fr.xephi.authme.command.executable.authme.*;
+import fr.xephi.authme.command.executable.authme.ChangePasswordCommand;
+import fr.xephi.authme.command.executable.authme.RegisterCommand;
+import fr.xephi.authme.command.executable.authme.UnregisterCommand;
+import fr.xephi.authme.command.executable.captcha.CaptchaCommand;
+import fr.xephi.authme.command.executable.converter.ConverterCommand;
+import fr.xephi.authme.command.executable.email.AddEmailCommand;
+import fr.xephi.authme.command.executable.email.ChangeEmailCommand;
+import fr.xephi.authme.command.executable.email.RecoverEmailCommand;
+import fr.xephi.authme.command.executable.login.LoginCommand;
+import fr.xephi.authme.command.executable.logout.LogoutCommand;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@SuppressWarnings("UnusedDeclaration")
+public class CommandManager {
+
+    /** The list of commandDescriptions. */
+    private List<CommandDescription> commandDescriptions = new ArrayList<>();
+
+    /**
+     * Constructor.
+     *
+     * @param registerCommands True to register the commands, false otherwise.
+     */
+    public CommandManager(boolean registerCommands) {
+        // Register the commands
+        if(registerCommands)
+            registerCommands();
+    }
+
+    /**
+     * Register all commands.
+     */
+    @SuppressWarnings("SpellCheckingInspection")
+    public void registerCommands() {
+        // Register the base AuthMe Reloaded command
+        CommandDescription authMeBaseCommand = new CommandDescription(
+                new AuthMeCommand(),
+                new ArrayList<String>() {{
+                    add("authme");
+                }},
+                "Main command",
+                "The main AuthMeReloaded command. The root for all admin commands.", null);
+
+        // Register the help command
+        CommandDescription authMeHelpCommand = new CommandDescription(
+                new HelpCommand(),
+                new ArrayList<String>() {{
+                    add("help");
+                    add("hlp");
+                    add("h");
+                    add("sos");
+                    add("?");
+                }},
+                "View help",
+                "View detailed help pages about AuthMeReloaded commands.",
+                authMeBaseCommand);
+        authMeHelpCommand.addArgument(new CommandArgumentDescription("query", "The command or query to view help for.", true));
+        authMeHelpCommand.setMaximumArguments(false);
+
+        // Register the register command
+        CommandDescription registerCommand = new CommandDescription(
+                new RegisterCommand(),
+                new ArrayList<String>() {{
+                    add("register");
+                    add("reg");
+                    add("r");
+                }},
+                "Register a player",
+                "Register the specified player with the specified password.",
+                authMeBaseCommand);
+        registerCommand.setCommandPermissions("authme.admin.register", CommandPermissions.DefaultPermission.OP_ONLY);
+        registerCommand.addArgument(new CommandArgumentDescription("player", "Player name", false));
+        registerCommand.addArgument(new CommandArgumentDescription("password", "Password", false));
+
+        // Register the unregister command
+        CommandDescription unregisterCommand = new CommandDescription(
+                new UnregisterCommand(),
+                new ArrayList<String>() {{
+                    add("unregister");
+                    add("unreg");
+                    add("unr");
+                    add("delete");
+                    add("del");
+                }},
+                "Unregister a player",
+                "Unregister the specified player.",
+                authMeBaseCommand);
+        unregisterCommand.setCommandPermissions("authme.admin.unregister", CommandPermissions.DefaultPermission.OP_ONLY);
+        unregisterCommand.addArgument(new CommandArgumentDescription("player", "Player name", false));
+
+        // Register the forcelogin command
+        CommandDescription forceLoginCommand = new CommandDescription(
+                new ForceLoginCommand(),
+                new ArrayList<String>() {{
+                    add("forcelogin");
+                    add("login");
+                }},
+                "Enforce login player",
+                "Enforce the specified player to login.",
+                authMeBaseCommand);
+        forceLoginCommand.setCommandPermissions("authme.admin.forcelogin", CommandPermissions.DefaultPermission.OP_ONLY);
+        forceLoginCommand.addArgument(new CommandArgumentDescription("player", "Online player name", true));
+
+        // Register the changepassword command
+        CommandDescription changePasswordCommand = new CommandDescription(
+                new ChangePasswordCommand(),
+                new ArrayList<String>() {{
+                    add("password");
+                    add("changepassword");
+                    add("changepass");
+                    add("cp");
+                }},
+                "Change player's password",
+                "Change the password of a player.",
+                authMeBaseCommand);
+        changePasswordCommand.setCommandPermissions("authme.admin.changepassword", CommandPermissions.DefaultPermission.OP_ONLY);
+        changePasswordCommand.addArgument(new CommandArgumentDescription("player", "Player name", false));
+        changePasswordCommand.addArgument(new CommandArgumentDescription("pwd", "New password", false));
+
+        // Register the purge command
+        CommandDescription lastLoginCommand = new CommandDescription(
+                new LastLoginCommand(),
+                new ArrayList<String>() {{
+                    add("lastlogin");
+                    add("ll");
+                }},
+                "Player's last login",
+                "View the date of the specified players last login",
+                authMeBaseCommand);
+        lastLoginCommand.setCommandPermissions("authme.admin.lastlogin", CommandPermissions.DefaultPermission.OP_ONLY);
+        lastLoginCommand.addArgument(new CommandArgumentDescription("player", "Player name", true));
+
+        // Register the accounts command
+        CommandDescription accountsCommand = new CommandDescription(
+                new AccountsCommand(),
+                new ArrayList<String>() {{
+                    add("accounts");
+                    add("account");
+                }},
+                "Display player accounts",
+                "Display all accounts of a player by it's player name or IP.",
+                authMeBaseCommand);
+        accountsCommand.setCommandPermissions("authme.admin.accounts", CommandPermissions.DefaultPermission.OP_ONLY);
+        accountsCommand.addArgument(new CommandArgumentDescription("player", "Player name or IP", true));
+
+        // Register the getemail command
+        CommandDescription getEmailCommand = new CommandDescription(
+                new GetEmailCommand(),
+                new ArrayList<String>() {{
+                    add("getemail");
+                    add("getmail");
+                    add("email");
+                    add("mail");
+                }},
+                "Display player's email",
+                "Display the email address of the specified player if set.",
+                authMeBaseCommand);
+        getEmailCommand.setCommandPermissions("authme.admin.getemail", CommandPermissions.DefaultPermission.OP_ONLY);
+        getEmailCommand.addArgument(new CommandArgumentDescription("player", "Player name", true));
+
+        // Register the setemail command
+        CommandDescription setEmailCommand = new CommandDescription(
+                new SetEmailCommand(),
+                new ArrayList<String>() {{
+                    add("chgemail");
+                    add("chgmail");
+                    add("setemail");
+                    add("setmail");
+                }},
+                "Change player's email",
+                "Change the email address of the specified player.",
+                authMeBaseCommand);
+        setEmailCommand.setCommandPermissions("authme.admin.chgemail", CommandPermissions.DefaultPermission.OP_ONLY);
+        setEmailCommand.addArgument(new CommandArgumentDescription("player", "Player name", false));
+        setEmailCommand.addArgument(new CommandArgumentDescription("email", "Player email", false));
+
+        // Register the getip command
+        CommandDescription getIpCommand = new CommandDescription(
+                new GetIpCommand(),
+                new ArrayList<String>() {{
+                    add("getip");
+                    add("ip");
+                }},
+                "Get player's IP",
+                "Get the IP address of the specified online player.",
+                authMeBaseCommand);
+        getIpCommand.setCommandPermissions("authme.admin.getip", CommandPermissions.DefaultPermission.OP_ONLY);
+        getIpCommand.addArgument(new CommandArgumentDescription("player", "Online player name", true));
+
+        // Register the spawn command
+        CommandDescription spawnCommand = new CommandDescription(
+                new SpawnCommand(),
+                new ArrayList<String>() {{
+                    add("spawn");
+                    add("home");
+                }},
+                "Teleport to spawn",
+                "Teleport to the spawn.",
+                authMeBaseCommand);
+        spawnCommand.setCommandPermissions("authme.admin.spawn", CommandPermissions.DefaultPermission.OP_ONLY);
+
+        // Register the setspawn command
+        CommandDescription setSpawnCommand = new CommandDescription(
+                new SetSpawnCommand(),
+                new ArrayList<String>() {{
+                    add("setspawn");
+                    add("chgspawn");
+                }},
+                "Change the spawn",
+                "Change the player's spawn to your current position.",
+                authMeBaseCommand);
+        setSpawnCommand.setCommandPermissions("authme.admin.setspawn", CommandPermissions.DefaultPermission.OP_ONLY);
+
+        // Register the firstspawn command
+        CommandDescription firstSpawnCommand = new CommandDescription(
+                new FirstSpawnCommand(),
+                new ArrayList<String>() {{
+                    add("firstspawn");
+                    add("firsthome");
+                }},
+                "Teleport to first spawn",
+                "Teleport to the first spawn.",
+                authMeBaseCommand);
+        firstSpawnCommand.setCommandPermissions("authme.admin.firstspawn", CommandPermissions.DefaultPermission.OP_ONLY);
+
+        // Register the setfirstspawn command
+        CommandDescription setFirstSpawnCommand = new CommandDescription(
+                new SetFirstSpawnCommand(),
+                new ArrayList<String>() {{
+                    add("setfirstspawn");
+                    add("chgfirstspawn");
+                }},
+                "Change the first spawn",
+                "Change the first player's spawn to your current position.",
+                authMeBaseCommand);
+        setFirstSpawnCommand.setCommandPermissions("authme.admin.setfirstspawn", CommandPermissions.DefaultPermission.OP_ONLY);
+
+        // Register the purge command
+        CommandDescription purgeCommand = new CommandDescription(
+                new PurgeCommand(),
+                new ArrayList<String>() {{
+                    add("purge");
+                    add("delete");
+                }},
+                "Purge old data",
+                "Purge old AuthMeReloaded data longer than the specified amount of days ago.",
+                authMeBaseCommand);
+        purgeCommand.setCommandPermissions("authme.admin.purge", CommandPermissions.DefaultPermission.OP_ONLY);
+        purgeCommand.addArgument(new CommandArgumentDescription("days", "Number of days", false));
+
+        // Register the purgelastposition command
+        CommandDescription purgeLastPositionCommand = new CommandDescription(
+                new PurgeLastPositionCommand(),
+                new ArrayList<String>() {{
+                    add("resetpos");
+                    add("purgelastposition");
+                    add("purgelastpos");
+                    add("resetposition");
+                    add("resetlastposition");
+                    add("resetlastpos");
+                }},
+                "Purge player's last position",
+                "Purge the last know position of the specified player.",
+                authMeBaseCommand);
+        purgeLastPositionCommand.setCommandPermissions("authme.admin.purgelastpos", CommandPermissions.DefaultPermission.OP_ONLY);
+        purgeLastPositionCommand.addArgument(new CommandArgumentDescription("player", "Player name", true));
+
+        // Register the purgebannedplayers command
+        CommandDescription purgeBannedPlayersCommand = new CommandDescription(
+                new PurgeBannedPlayersCommand(),
+                new ArrayList<String>() {{
+                    add("purgebannedplayers");
+                    add("purgebannedplayer");
+                    add("deletebannedplayers");
+                    add("deletebannedplayer");
+                }},
+                "Purge banned palyers data",
+                "Purge all AuthMeReloaded data for banned players.",
+                authMeBaseCommand);
+        purgeBannedPlayersCommand.setCommandPermissions("authme.admin.purgebannedplayers", CommandPermissions.DefaultPermission.OP_ONLY);
+
+        // Register the switchantibot command
+        CommandDescription switchAntiBotCommand = new CommandDescription(
+                new SwitchAntiBotCommand(),
+                new ArrayList<String>() {{
+                    add("switchantibot");
+                    add("toggleantibot");
+                    add("antibot");
+                }},
+                "Switch AntiBot mode",
+                "Switch or toggle the AntiBot mode to the specified state.",
+                authMeBaseCommand);
+        switchAntiBotCommand.setCommandPermissions("authme.admin.switchantibot", CommandPermissions.DefaultPermission.OP_ONLY);
+        switchAntiBotCommand.addArgument(new CommandArgumentDescription("mode", "ON / OFF", true));
+
+//        // Register the resetname command
+//        CommandDescription resetNameCommand = new CommandDescription(
+//                new ResetNameCommand(),
+//                new ArrayList<String>() {{
+//                    add("resetname");
+//                    add("resetnames");
+//                }},
+//                "Reset name",
+//                "Reset name",
+//                authMeCommand);
+//        resetNameCommand.setCommandPermissions("authme.admin.resetname", CommandPermissions.DefaultPermission.OP_ONLY);
+
+        // Register the reload command
+        CommandDescription reloadCommand = new CommandDescription(
+                new ReloadCommand(),
+                new ArrayList<String>() {{
+                    add("reload");
+                    add("rld");
+                }},
+                "Reload plugin",
+                "Reload the AuthMeReloaded plugin.",
+                authMeBaseCommand);
+        reloadCommand.setCommandPermissions("authme.admin.reload", CommandPermissions.DefaultPermission.OP_ONLY);
+
+        // Register the version command
+        CommandDescription versionCommand = new CommandDescription(
+                new VersionCommand(),
+                new ArrayList<String>() {{
+                    add("version");
+                    add("ver");
+                    add("v");
+                    add("about");
+                    add("info");
+                }},
+                "Version info",
+                "Show detailed information about the installed AuthMeReloaded version, and shows the developers, contributors, license and other information.",
+                authMeBaseCommand);
+        versionCommand.setMaximumArguments(false);
+
+        // Register the base Dungeon Maze command
+        CommandDescription loginBaseCommand = new CommandDescription(
+                new LoginCommand(),
+                new ArrayList<String>() {{
+                    add("login");
+                }},
+                "Login command",
+                "Command to login using AuthMeReloaded.", null);
+        loginBaseCommand.setCommandPermissions("authme.login", CommandPermissions.DefaultPermission.ALLOWED);
+        loginBaseCommand.addArgument(new CommandArgumentDescription("password", "Login password", false));
+
+        // Register the help command
+        CommandDescription loginHelpCommand = new CommandDescription(
+                new HelpCommand(),
+                new ArrayList<String>() {{
+                    add("help");
+                    add("hlp");
+                    add("h");
+                    add("sos");
+                    add("?");
+                }},
+                "View help",
+                "View detailed help pages about AuthMeReloaded login commands.",
+                loginBaseCommand);
+        loginHelpCommand.addArgument(new CommandArgumentDescription("query", "The command or query to view help for.", true));
+        loginHelpCommand.setMaximumArguments(false);
+
+        // Register the base logout command
+        CommandDescription logoutBaseCommand = new CommandDescription(
+                new LogoutCommand(),
+                new ArrayList<String>() {{
+                    add("logout");
+                }},
+                "Logout command",
+                "Command to logout using AuthMeReloaded.", null);
+        logoutBaseCommand.setCommandPermissions("authme.logout", CommandPermissions.DefaultPermission.ALLOWED);
+
+        // Register the help command
+        CommandDescription logoutHelpCommand = new CommandDescription(
+                new HelpCommand(),
+                new ArrayList<String>() {{
+                    add("help");
+                    add("hlp");
+                    add("h");
+                    add("sos");
+                    add("?");
+                }},
+                "View help",
+                "View detailed help pages about AuthMeReloaded logout commands.",
+                logoutBaseCommand);
+        logoutHelpCommand.addArgument(new CommandArgumentDescription("query", "The command or query to view help for.", true));
+        logoutHelpCommand.setMaximumArguments(false);
+
+        // Register the base register command
+        CommandDescription registerBaseCommand = new CommandDescription(
+                new fr.xephi.authme.command.executable.register.RegisterCommand(),
+                new ArrayList<String>() {{
+                    add("register");
+                    add("reg");
+                }},
+                "Registration command",
+                "Command to register using AuthMeReloaded.", null);
+        registerBaseCommand.setCommandPermissions("authme.register", CommandPermissions.DefaultPermission.ALLOWED);
+        registerBaseCommand.addArgument(new CommandArgumentDescription("password", "Password", false));
+        registerBaseCommand.addArgument(new CommandArgumentDescription("verifyPassword", "Verify password", false));
+        registerBaseCommand.setMaximumArguments(false);
+
+        // Register the help command
+        CommandDescription registerHelpCommand = new CommandDescription(
+                new HelpCommand(),
+                new ArrayList<String>() {{
+                    add("help");
+                    add("hlp");
+                    add("h");
+                    add("sos");
+                    add("?");
+                }},
+                "View help",
+                "View detailed help pages about AuthMeReloaded register commands.",
+                registerBaseCommand);
+        registerHelpCommand.addArgument(new CommandArgumentDescription("query", "The command or query to view help for.", true));
+        registerHelpCommand.setMaximumArguments(false);
+
+        // Register the base unregister command
+        CommandDescription unregisterBaseCommand = new CommandDescription(
+                new fr.xephi.authme.command.executable.unregister.UnregisterCommand(),
+                new ArrayList<String>() {{
+                    add("unregister");
+                    add("unreg");
+                }},
+                "Unregistration command",
+                "Command to unregister using AuthMeReloaded.", null);
+        unregisterBaseCommand.setCommandPermissions("authme.unregister", CommandPermissions.DefaultPermission.ALLOWED);
+        unregisterBaseCommand.addArgument(new CommandArgumentDescription("password", "Password", false));
+
+        // Register the help command
+        CommandDescription unregisterHelpCommand = new CommandDescription(
+                new HelpCommand(),
+                new ArrayList<String>() {{
+                    add("help");
+                    add("hlp");
+                    add("h");
+                    add("sos");
+                    add("?");
+                }},
+                "View help",
+                "View detailed help pages about AuthMeReloaded unregister commands.",
+                unregisterBaseCommand);
+        unregisterHelpCommand.addArgument(new CommandArgumentDescription("query", "The command or query to view help for.", true));
+        unregisterHelpCommand.setMaximumArguments(false);
+
+        // Register the base changepassword command
+        CommandDescription changePasswordBaseCommand = new CommandDescription(
+                new fr.xephi.authme.command.executable.changepassword.ChangePasswordCommand(),
+                new ArrayList<String>() {{
+                    add("changepassword");
+                    add("changepass");
+                }},
+                "Change password command",
+                "Command to change your password using AuthMeReloaded.", null);
+        changePasswordBaseCommand.setCommandPermissions("authme.changepassword", CommandPermissions.DefaultPermission.ALLOWED);
+        changePasswordBaseCommand.addArgument(new CommandArgumentDescription("password", "Password", false));
+        changePasswordBaseCommand.addArgument(new CommandArgumentDescription("verifyPassword", "Verify password", false));
+        changePasswordBaseCommand.setMaximumArguments(false);
+
+        // Register the help command
+        CommandDescription changePasswordHelpCommand = new CommandDescription(
+                new HelpCommand(),
+                new ArrayList<String>() {{
+                    add("help");
+                    add("hlp");
+                    add("h");
+                    add("sos");
+                    add("?");
+                }},
+                "View help",
+                "View detailed help pages about AuthMeReloaded change password commands.",
+                changePasswordBaseCommand);
+        changePasswordHelpCommand.addArgument(new CommandArgumentDescription("query", "The command or query to view help for.", true));
+        changePasswordHelpCommand.setMaximumArguments(false);
+
+        // Register the base Dungeon Maze command
+        CommandDescription emailBaseCommand = new CommandDescription(
+                new HelpCommand(),
+                new ArrayList<String>() {{
+                    add("email");
+                    add("mail");
+                }},
+                "E-mail command",
+                "The AuthMe Reloaded E-mail command. The root for all E-mail commands.", null);
+
+        // Register the help command
+        CommandDescription emailHelpCommand = new CommandDescription(
+                new HelpCommand(),
+                new ArrayList<String>() {{
+                    add("help");
+                    add("hlp");
+                    add("h");
+                    add("sos");
+                    add("?");
+                }},
+                "View help",
+                "View detailed help pages about AuthMeReloaded help commands.",
+                emailBaseCommand);
+        emailHelpCommand.addArgument(new CommandArgumentDescription("query", "The command or query to view help for.", true));
+        emailHelpCommand.setMaximumArguments(false);
+
+        // Register the add command
+        CommandDescription addEmailCommand = new CommandDescription(
+                new AddEmailCommand(),
+                new ArrayList<String>() {{
+                    add("add");
+                    add("addemail");
+                    add("addmail");
+                }},
+                "Add E-mail",
+                "Add an new E-Mail address to your account.",
+                emailBaseCommand);
+        addEmailCommand.setCommandPermissions("authme.email.add", CommandPermissions.DefaultPermission.ALLOWED);
+        addEmailCommand.addArgument(new CommandArgumentDescription("email", "Email address", false));
+        addEmailCommand.addArgument(new CommandArgumentDescription("verifyEmail", "Email address verification", false));
+
+        // Register the change command
+        CommandDescription changeEmailCommand = new CommandDescription(
+                new ChangeEmailCommand(),
+                new ArrayList<String>() {{
+                    add("change");
+                    add("changeemail");
+                    add("changemail");
+                }},
+                "Change E-mail",
+                "Change an E-Mail address of your account.",
+                emailBaseCommand);
+        changeEmailCommand.setCommandPermissions("authme.email.change", CommandPermissions.DefaultPermission.ALLOWED);
+        changeEmailCommand.addArgument(new CommandArgumentDescription("oldEmail", "Old email address", false));
+        changeEmailCommand.addArgument(new CommandArgumentDescription("newEmail", "New email address", false));
+
+        // Register the recover command
+        CommandDescription recoverEmailCommand = new CommandDescription(
+                new RecoverEmailCommand(),
+                new ArrayList<String>() {{
+                    add("recover");
+                    add("recovery");
+                    add("recoveremail");
+                    add("recovermail");
+                }},
+                "Recover using E-mail",
+                "Recover your account using an E-mail address.",
+                emailBaseCommand);
+        recoverEmailCommand.setCommandPermissions("authme.email.recover", CommandPermissions.DefaultPermission.ALLOWED);
+        recoverEmailCommand.addArgument(new CommandArgumentDescription("email", "Email address", false));
+
+        // Register the base captcha command
+        CommandDescription captchaBaseCommand = new CommandDescription(
+                new CaptchaCommand(),
+                new ArrayList<String>() {{
+                    add("captcha");
+                    add("capt");
+                }},
+                "Captcha command",
+                "Captcha command for AuthMeReloaded.", null);
+        captchaBaseCommand.setCommandPermissions("authme.captcha", CommandPermissions.DefaultPermission.ALLOWED);
+        captchaBaseCommand.addArgument(new CommandArgumentDescription("captcha", "The captcha", false));
+        captchaBaseCommand.setMaximumArguments(false);
+
+        // Register the help command
+        CommandDescription captchaHelpCommand = new CommandDescription(
+                new HelpCommand(),
+                new ArrayList<String>() {{
+                    add("help");
+                    add("hlp");
+                    add("h");
+                    add("sos");
+                    add("?");
+                }},
+                "View help",
+                "View detailed help pages about AuthMeReloaded change captcha commands.",
+                captchaBaseCommand);
+        captchaHelpCommand.addArgument(new CommandArgumentDescription("query", "The command or query to view help for.", true));
+        captchaHelpCommand.setMaximumArguments(false);
+
+        // Register the base converter command
+        CommandDescription converterBaseCommand = new CommandDescription(
+                new ConverterCommand(),
+                new ArrayList<String>() {{
+                    add("converter");
+                    add("convert");
+                    add("conv");
+                }},
+                "Convert command",
+                "Convert command for AuthMeReloaded.", null);
+        converterBaseCommand.setCommandPermissions("authme.converter", CommandPermissions.DefaultPermission.OP_ONLY);
+        converterBaseCommand.addArgument(new CommandArgumentDescription("job", "Conversion job: flattosql / flattosqlite /| xauth / crazylogin / rakamak / royalauth / vauth / sqltoflat", false));
+        converterBaseCommand.setMaximumArguments(false);
+
+        // Register the help command
+        CommandDescription converterHelpCommand = new CommandDescription(
+                new HelpCommand(),
+                new ArrayList<String>() {{
+                    add("help");
+                    add("hlp");
+                    add("h");
+                    add("sos");
+                    add("?");
+                }},
+                "View help",
+                "View detailed help pages about AuthMeReloaded change captcha commands.",
+                converterBaseCommand);
+        converterHelpCommand.addArgument(new CommandArgumentDescription("query", "The command or query to view help for.", true));
+        converterHelpCommand.setMaximumArguments(false);
+
+        // Add the base commands to the commands array
+        this.commandDescriptions.add(authMeBaseCommand);
+        this.commandDescriptions.add(loginBaseCommand);
+        this.commandDescriptions.add(logoutBaseCommand);
+        this.commandDescriptions.add(registerBaseCommand);
+        this.commandDescriptions.add(unregisterBaseCommand);
+        this.commandDescriptions.add(changePasswordBaseCommand);
+        this.commandDescriptions.add(emailBaseCommand);
+        this.commandDescriptions.add(captchaBaseCommand);
+        this.commandDescriptions.add(converterBaseCommand);
+    }
+
+    /**
+     * Get the list of command descriptions
+     *
+     * @return List of command descriptions.
+     */
+    public List<CommandDescription> getCommandDescriptions() {
+        return this.commandDescriptions;
+    }
+
+    /**
+     * Get the number of command description count.
+     *
+     * @return Command description count.
+     */
+    public int getCommandDescriptionCount() {
+        return this.getCommandDescriptions().size();
+    }
+
+    /**
+     * Find the best suitable command for the specified reference.
+     *
+     * @param queryReference The query reference to find a command for.
+     *
+     * @return The command found, or null.
+     */
+    public FoundCommandResult findCommand(CommandParts queryReference) {
+        // Make sure the command reference is valid
+        if(queryReference.getCount() <= 0)
+            return null;
+
+        // Get the base command description
+        for(CommandDescription commandDescription : this.commandDescriptions) {
+            // Check whether there's a command description available for the current command
+            if(!commandDescription.isSuitableLabel(queryReference))
+                continue;
+
+            // Find the command reference, return the result
+            return commandDescription.findCommand(queryReference);
+        }
+
+        // No applicable command description found, return false
+        return null;
+    }
+}

src/main/java/fr/xephi/authme/command/CommandParts.java

@@ -0,0 +1,204 @@
+package fr.xephi.authme.command;
+
+import fr.xephi.authme.util.ListUtils;
+import fr.xephi.authme.util.StringUtils;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class CommandParts {
+
+    /** The list of parts for this command. */
+    private List<String> parts = new ArrayList<>();
+
+    /**
+     * Constructor.
+     */
+    public CommandParts() { }
+
+    /**
+     * Constructor.
+     *
+     * @param part The part to add.
+     */
+    public CommandParts(String part) {
+        this.parts.add(part);
+    }
+
+    /**
+     * Constructor.
+     *
+     * @param commandParts The command parts instance.
+     */
+    public CommandParts(CommandParts commandParts) {
+        this.parts.addAll(commandParts.getList());
+    }
+
+    /**
+     * Constructor.
+     *
+     * @param parts The list of parts.
+     */
+    public CommandParts(List<String> parts) {
+        this.parts.addAll(parts);
+    }
+
+    /**
+     * Constructor.
+     *
+     * @param base The base part.
+     * @param parts The list of additional parts.
+     */
+    public CommandParts(String base, List<String> parts) {
+        this.parts.add(base);
+        this.parts.addAll(parts);
+    }
+
+    /**
+     * Get the command parts.
+     *
+     * @return Command parts.
+     */
+    public List<String> getList() {
+        return this.parts;
+    }
+
+    /**
+     * Add a part.
+     *
+     * @param part The part to add.
+     *
+     * @return The result.
+     */
+    public boolean add(String part) {
+        return this.parts.add(part);
+    }
+
+    /**
+     * Add some parts.
+     *
+     * @param parts The parts to add.
+     *
+     * @return The result.
+     */
+    public boolean add(List<String> parts) {
+        return this.parts.addAll(parts);
+    }
+
+    /**
+     * Add some parts.
+     *
+     * @param parts The parts to add.
+     *
+     * @return The result.
+     */
+    public boolean add(String[] parts) {
+        for(String entry : parts)
+            add(entry);
+        return true;
+    }
+
+    /**
+     * Get the number of parts.
+     *
+     * @return Part count.
+     */
+    public int getCount() {
+        return this.parts.size();
+    }
+
+    /**
+     * Get a part by it's index.
+     *
+     * @param i Part index.
+     *
+     * @return The part.
+     */
+    public String get(int i) {
+        // Make sure the index is in-bound
+        if(i < 0 || i >= getCount())
+            return null;
+
+        // Get and return the argument
+        return this.parts.get(i);
+    }
+
+    /**
+     * Get a range of the parts starting at the specified index up to the end of the range.
+     *
+     * @param start The starting index.
+     *
+     * @return The parts range. Arguments that were out of bound are not included.
+     */
+    public List<String> getRange(int start) {
+        return getRange(start, getCount() - start);
+    }
+
+    /**
+     * Get a range of the parts.
+     *
+     * @param start The starting index.
+     * @param count The number of parts to get.
+     *
+     * @return The parts range. Parts that were out of bound are not included.
+     */
+    public List<String> getRange(int start, int count) {
+        // Create a new list to put the range into
+        List<String> elements = new ArrayList<>();
+
+        // Get the range
+        for(int i = start; i < start + count; i++) {
+            // Get the part and add it if it's valid
+            String element = get(i);
+            if(element != null)
+                elements.add(element);
+        }
+
+        // Return the list of parts
+        return elements;
+    }
+
+    /**
+     * Get the difference value between two references. This won't do a full compare, just the last reference parts instead.
+     *
+     * @param other The other reference.
+     *
+     * @return The result from zero to above. A negative number will be returned on error.
+     */
+    @SuppressWarnings("UnusedDeclaration")
+    public double getDifference(CommandParts other) {
+        return getDifference(other, false);
+    }
+
+    /**
+     * Get the difference value between two references.
+     *
+     * @param other The other reference.
+     * @param fullCompare True to compare the full references as far as the range reaches.
+     *
+     * @return The result from zero to above. A negative number will be returned on error.
+     */
+    public double getDifference(CommandParts other, boolean fullCompare) {
+        // Make sure the other reference is correct
+        if(other == null)
+            return -1;
+
+        // Get the range to use
+        int range = Math.min(this.getCount(), other.getCount());
+
+        // Get and the difference
+        if(fullCompare)
+            return StringUtils.getDifference(this.toString(), other.toString());
+        return StringUtils.getDifference(this.getRange(range - 1, 1).toString(), other.getRange(range - 1, 1).toString());
+    }
+
+    /**
+     * Convert the parts to a string.
+     *
+     * @return The part as a string.
+     */
+    @Override
+    public String toString() {
+        return ListUtils.implode(this.parts, " ");
+    }
+}

src/main/java/fr/xephi/authme/command/CommandPermissions.java

@@ -0,0 +1,183 @@
+package fr.xephi.authme.command;
+
+//import com.timvisee.dungeonmaze.Core;
+//import com.timvisee.dungeonmaze.permission.PermissionsManager;
+import fr.xephi.authme.AuthMe;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@SuppressWarnings("UnusedDeclaration")
+public class CommandPermissions {
+
+    /** Defines the permission nodes required to have permission to execute this command. */
+    private List<String> permissionNodes = new ArrayList<>();
+    /** Defines the default permission if the permission nodes couldn't be used. */
+    private DefaultPermission defaultPermission = DefaultPermission.NOT_ALLOWED;
+
+    /**
+     * Constructor.
+     */
+    public CommandPermissions() { }
+
+    /**
+     * Constructor.
+     *
+     * @param permissionNode The permission node required to execute a command.
+     * @param defaultPermission The default permission if the permission nodes couldn't be used.
+     */
+    public CommandPermissions(String permissionNode, DefaultPermission defaultPermission) {
+        this.permissionNodes.add(permissionNode);
+        this.defaultPermission = defaultPermission;
+    }
+
+    /**
+     * Constructor.
+     *
+     * @param permissionNodes The permission nodes required to execute a command.
+     * @param defaultPermission The default permission if the permission nodes couldn't be used.
+     */
+    public CommandPermissions(List<String> permissionNodes, DefaultPermission defaultPermission) {
+        this.permissionNodes.addAll(permissionNodes);
+    }
+
+    /**
+     * Add a permission node required to execute this command.
+     *
+     * @param permissionNode The permission node to add.
+     *
+     * @return True on success, false on failure.
+     */
+    public boolean addPermissionNode(String permissionNode) {
+        // Trim the permission node
+        permissionNode = permissionNode.trim();
+
+        // Make sure the permission node is valid
+        if(permissionNode.length() == 0)
+            return false;
+
+        // Make sure this permission node hasn't been added already
+        if(hasPermissionNode(permissionNode))
+            return true;
+
+        // Add the permission node, return the result
+        return this.permissionNodes.add(permissionNode);
+    }
+
+    /**
+     * Check whether this command requires a specified permission node to execute.
+     *
+     * @param permissionNode The permission node to check for.
+     *
+     * @return True if this permission node is required, false if not.
+     */
+    public boolean hasPermissionNode(String permissionNode) {
+        return this.permissionNodes.contains(permissionNode);
+    }
+
+    /**
+     * Get the permission nodes required to execute this command.
+     *
+     * @return The permission nodes required to execute this command.
+     */
+    public List<String> getPermissionNodes() {
+        return this.permissionNodes;
+    }
+
+    /**
+     * Get the number of permission nodes set.
+     *
+     * @return Permission node count.
+     */
+    public int getPermissionNodeCount() {
+        return this.permissionNodes.size();
+    }
+
+    /**
+     * Set the permission nodes required to execute this command.
+     *
+     * @param permissionNodes The permission nodes required to execute this command.
+     */
+    public void setPermissionNodes(List<String> permissionNodes) {
+        this.permissionNodes = permissionNodes;
+    }
+
+    /**
+     * Check whether this command requires any permission to be executed. This is based on the getPermission() method.
+     *
+     * @return True if this command requires any permission to be executed by a player.
+     */
+    public boolean hasPermission(CommandSender sender) {
+        // Make sure any permission node is set
+        if(getPermissionNodeCount() == 0)
+            return true;
+
+        // Get the default permission
+        final boolean defaultPermission = getDefaultPermissionCommandSender(sender);
+
+        // Make sure the command sender is a player, if not use the default
+        if(!(sender instanceof Player))
+            return defaultPermission;
+
+        // Get the player instance
+        Player player = (Player) sender;
+
+//        // Get the permissions manager, and make sure it's instance is valid
+//        PermissionsManager permissionsManager = Core.getPermissionsManager();
+//        if(permissionsManager == null)
+//            return false;
+
+        // Check whether the player has permission, return the result
+        for(String node : this.permissionNodes)
+            if(!AuthMe.getInstance().authmePermissible(player, node))
+                return false;
+        return true;
+    }
+
+    /**
+     * Get the default permission if the permission nodes couldn't be used.
+     *
+     * @return The default permission.
+     */
+    public DefaultPermission getDefaultPermission() {
+        return this.defaultPermission;
+    }
+
+    /**
+     * Set the default permission used if the permission nodes couldn't be used.
+     *
+     * @param defaultPermission The default permission.
+     */
+    public void setDefaultPermission(DefaultPermission defaultPermission) {
+        this.defaultPermission = defaultPermission;
+    }
+
+    /**
+     * Get the default permission for a specified command sender.
+     *
+     * @param sender The command sender to get the default permission for.
+     *
+     * @return True if the command sender has permission by default, false otherwise.
+     */
+    public boolean getDefaultPermissionCommandSender(CommandSender sender) {
+        switch(getDefaultPermission()) {
+        case ALLOWED:
+            return true;
+
+        case OP_ONLY:
+            return sender.isOp();
+
+        case NOT_ALLOWED:
+        default:
+            return false;
+        }
+    }
+
+    public enum DefaultPermission {
+        NOT_ALLOWED,
+        OP_ONLY,
+        ALLOWED
+    }
+}

src/main/java/fr/xephi/authme/command/ExecutableCommand.java

@@ -0,0 +1,17 @@
+package fr.xephi.authme.command;
+
+import org.bukkit.command.CommandSender;
+
+public abstract class ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    public abstract boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments);
+}

src/main/java/fr/xephi/authme/command/FoundCommandResult.java

@@ -0,0 +1,151 @@
+package fr.xephi.authme.command;
+
+import org.bukkit.command.CommandSender;
+
+public class FoundCommandResult {
+
+    /** The command description instance. */
+    private CommandDescription commandDescription;
+    /** The command reference. */
+    private CommandParts commandReference;
+    /** The command arguments. */
+    private CommandParts commandArguments;
+    /** The original search query reference. */
+    private CommandParts queryReference;
+
+    /**
+     * Constructor.
+     *
+     * @param commandDescription The command description.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     * @param queryReference The original query reference.
+     */
+    public FoundCommandResult(CommandDescription commandDescription, CommandParts commandReference, CommandParts commandArguments, CommandParts queryReference) {
+        this.commandDescription = commandDescription;
+        this.commandReference = commandReference;
+        this.commandArguments = commandArguments;
+        this.queryReference = queryReference;
+    }
+
+    /**
+     * Check whether the command was suitable.
+     *
+     * @return True if the command was suitable, false otherwise.
+     */
+    public boolean hasProperArguments() {
+        // Make sure the command description is set
+        if(this.commandDescription == null)
+            return false;
+
+        // Get and return the result
+        return getCommandDescription().getSuitableArgumentsDifference(this.queryReference) == 0;
+    }
+
+    /**
+     * Get the command description.
+     *
+     * @return Command description.
+     */
+    public CommandDescription getCommandDescription() {
+        return this.commandDescription;
+    }
+
+    /**
+     * Set the command description.
+     *
+     * @param commandDescription The command description.
+     *
+     */
+    @SuppressWarnings("UnusedDeclaration")
+    public void setCommandDescription(CommandDescription commandDescription) {
+        this.commandDescription = commandDescription;
+    }
+
+    /**
+     * Check whether the command is executable.
+     *
+     * @return True if the command is executable, false otherwise.
+     */
+    public boolean isExecutable() {
+        // Make sure the command description is valid
+        if(this.commandDescription == null)
+            return false;
+
+        // Check whether the command is executable, return the result
+        return this.commandDescription.isExecutable();
+    }
+
+    /**
+     * Execute the command.
+     *
+     * @param sender The command sender that executed the command.
+     *
+     * @return True on success, false on failure.
+     */
+    public boolean executeCommand(CommandSender sender) {
+        // Make sure the command description is valid
+        if(this.commandDescription == null)
+            return false;
+
+        // Execute the command
+        return this.commandDescription.execute(sender, this.commandReference, this.commandArguments);
+    }
+
+    /**
+     * Check whether a command sender has permission to execute the command.
+     *
+     * @param sender The command sender.
+     *
+     * @return True if the command sender has permission, false otherwise.
+     */
+    public boolean hasPermission(CommandSender sender) {
+        // Make sure the command description is valid
+        if(this.commandDescription == null)
+            return false;
+
+        // Get and return the permission
+        return this.commandDescription.getCommandPermissions().hasPermission(sender);
+    }
+
+    /**
+     * Get the command reference.
+     *
+     * @return The command reference.
+     */
+    public CommandParts getCommandReference() {
+        return this.commandReference;
+    }
+
+    /**
+     * Get the command arguments.
+     *
+     * @return The command arguments.
+     */
+    public CommandParts getCommandArguments() {
+        return this.commandArguments;
+    }
+
+    /**
+     * Get the original query reference.
+     *
+     * @return Original query reference.
+     */
+    public CommandParts getQueryReference() {
+        return this.queryReference;
+    }
+
+    /**
+     * Get the difference value between the original query and the result reference.
+     *
+     * @return The difference value.
+     */
+    public double getDifference() {
+        // Get the difference through the command found
+        if(this.commandDescription != null)
+            return this.commandDescription.getCommandDifference(this.queryReference);
+
+        // Get the difference from the query reference
+        return this.queryReference.getDifference(commandReference, true);
+    }
+}

src/main/java/fr/xephi/authme/command/executable/HelpCommand.java

@@ -0,0 +1,37 @@
+package fr.xephi.authme.command.executable;
+
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.command.help.HelpProvider;
+import org.bukkit.command.CommandSender;
+
+public class HelpCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // Check whether quick help should be shown
+        boolean quickHelp = commandArguments.getCount() == 0;
+
+        // Set the proper command arguments for the quick help
+        if(quickHelp)
+            commandArguments = new CommandParts(commandReference.get(0));
+
+        // Show the new help
+        if(quickHelp)
+            HelpProvider.showHelp(sender, commandReference, commandArguments, false, false, false, false, false, true);
+        else
+            HelpProvider.showHelp(sender, commandReference, commandArguments);
+
+        // Return the result
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/authme/AccountsCommand.java

@@ -0,0 +1,111 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.cache.auth.PlayerAuth;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.settings.Messages;
+import org.bukkit.Bukkit;
+import org.bukkit.command.CommandSender;
+
+import java.util.List;
+
+public class AccountsCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(final CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        final AuthMe plugin = AuthMe.getInstance();
+
+        // Messages instance
+        final Messages m = Messages.getInstance();
+
+        // Get the player query
+        String playerQuery = sender.getName();
+        if(commandArguments.getCount() >= 1)
+            playerQuery = commandArguments.get(0);
+        final String playerQueryFinal = playerQuery;
+
+        // Command logic
+        if (!playerQuery.contains(".")) {
+            Bukkit.getScheduler().scheduleSyncDelayedTask(plugin, new Runnable() {
+
+                @Override
+                public void run() {
+                    PlayerAuth auth;
+                    StringBuilder message = new StringBuilder("[AuthMe] ");
+                    try {
+                        auth = plugin.database.getAuth(playerQueryFinal.toLowerCase());
+                    } catch (NullPointerException npe) {
+                        m.send(sender, "unknown_user");
+                        return;
+                    }
+                    if (auth == null) {
+                        m.send(sender, "unknown_user");
+                        return;
+                    }
+                    List<String> accountList = plugin.database.getAllAuthsByName(auth);
+                    if (accountList == null || accountList.isEmpty()) {
+                        m.send(sender, "user_unknown");
+                        return;
+                    }
+                    if (accountList.size() == 1) {
+                        sender.sendMessage("[AuthMe] " + playerQueryFinal + " is a single account player");
+                        return;
+                    }
+                    int i = 0;
+                    for (String account : accountList) {
+                        i++;
+                        message.append(account);
+                        if (i != accountList.size()) {
+                            message.append(", ");
+                        } else {
+                            message.append(".");
+                        }
+                    }
+                    sender.sendMessage("[AuthMe] " + playerQueryFinal + " has " + String.valueOf(accountList.size()) + " accounts");
+                    sender.sendMessage(message.toString());
+                }
+            });
+            return true;
+        } else {
+            Bukkit.getScheduler().scheduleSyncDelayedTask(plugin, new Runnable() {
+                @Override
+                public void run() {
+                    StringBuilder message = new StringBuilder("[AuthMe] ");
+                    List<String> accountList = plugin.database.getAllAuthsByIp(playerQueryFinal);
+                    if (accountList == null || accountList.isEmpty()) {
+                        sender.sendMessage("[AuthMe] This IP does not exist in the database");
+                        return;
+                    }
+                    if (accountList.size() == 1) {
+                        sender.sendMessage("[AuthMe] " + playerQueryFinal + " is a single account player");
+                        return;
+                    }
+                    int i = 0;
+                    for (String account : accountList) {
+                        i++;
+                        message.append(account);
+                        if (i != accountList.size()) {
+                            message.append(", ");
+                        } else {
+                            message.append(".");
+                        }
+                    }
+                    sender.sendMessage("[AuthMe] " + playerQueryFinal + " has " + String.valueOf(accountList.size()) + " accounts");
+                    sender.sendMessage(message.toString());
+                }
+            });
+            return true;
+        }
+    }
+}

src/main/java/fr/xephi/authme/command/executable/authme/AuthMeCommand.java

@@ -0,0 +1,29 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import org.bukkit.ChatColor;
+import org.bukkit.command.CommandSender;
+
+public class AuthMeCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // Show some version info
+        // TODO: Use plugin name and version constants here!
+        sender.sendMessage(ChatColor.GREEN + "This server is running " + AuthMe.PLUGIN_NAME + " v" + AuthMe.getVersionName() + "! " + ChatColor.RED + "<3");
+        sender.sendMessage(ChatColor.YELLOW + "Use the command " + ChatColor.GOLD + "/" + commandReference.get(0) + " help" + ChatColor.YELLOW + " to view help.");
+        sender.sendMessage(ChatColor.YELLOW + "Use the command " + ChatColor.GOLD + "/" + commandReference.get(0) + " about" + ChatColor.YELLOW + " to view about.");
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/authme/ChangePasswordCommand.java

@@ -0,0 +1,100 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.ConsoleLogger;
+import fr.xephi.authme.cache.auth.PlayerAuth;
+import fr.xephi.authme.cache.auth.PlayerCache;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.security.PasswordSecurity;
+import fr.xephi.authme.settings.Messages;
+import fr.xephi.authme.settings.Settings;
+import org.bukkit.Bukkit;
+import org.bukkit.command.CommandSender;
+
+import java.security.NoSuchAlgorithmException;
+
+public class ChangePasswordCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(final CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        final AuthMe plugin = AuthMe.getInstance();
+
+        // Messages instance
+        final Messages m = Messages.getInstance();
+
+        // Get the player and password
+        String playerName = commandArguments.get(0);
+        final String playerPass = commandArguments.get(1);
+
+        // Validate the password
+        String playerPassLowerCase = playerPass.toLowerCase();
+        if (playerPassLowerCase.contains("delete") || playerPassLowerCase.contains("where") || playerPassLowerCase.contains("insert") || playerPassLowerCase.contains("modify") || playerPassLowerCase.contains("from") || playerPassLowerCase.contains("select") || playerPassLowerCase.contains(";") || playerPassLowerCase.contains("null") || !playerPassLowerCase.matches(Settings.getPassRegex)) {
+            m.send(sender, "password_error");
+            return true;
+        }
+        if (playerPassLowerCase.equalsIgnoreCase(playerName)) {
+            m.send(sender, "password_error_nick");
+            return true;
+        }
+        if (playerPassLowerCase.length() < Settings.getPasswordMinLen || playerPassLowerCase.length() > Settings.passwordMaxLength) {
+            m.send(sender, "pass_len");
+            return true;
+        }
+        if (!Settings.unsafePasswords.isEmpty()) {
+            if (Settings.unsafePasswords.contains(playerPassLowerCase)) {
+                m.send(sender, "password_error_unsafe");
+                return true;
+            }
+        }
+
+        // Set the password
+        final String playerNameLowerCase = playerName.toLowerCase();
+        Bukkit.getScheduler().runTaskAsynchronously(plugin, new Runnable() {
+
+            @Override
+            public void run() {
+                String hash;
+                try {
+                    hash = PasswordSecurity.getHash(Settings.getPasswordHash, playerPass, playerNameLowerCase);
+                } catch (NoSuchAlgorithmException e) {
+                    m.send(sender, "error");
+                    return;
+                }
+                PlayerAuth auth = null;
+                if (PlayerCache.getInstance().isAuthenticated(playerNameLowerCase)) {
+                    auth = PlayerCache.getInstance().getAuth(playerNameLowerCase);
+                } else if (plugin.database.isAuthAvailable(playerNameLowerCase)) {
+                    auth = plugin.database.getAuth(playerNameLowerCase);
+                }
+                if (auth == null) {
+                    m.send(sender, "unknown_user");
+                    return;
+                }
+                auth.setHash(hash);
+                if (PasswordSecurity.userSalt.containsKey(playerNameLowerCase)) {
+                    auth.setSalt(PasswordSecurity.userSalt.get(playerNameLowerCase));
+                    plugin.database.updateSalt(auth);
+                }
+                if (!plugin.database.updatePassword(auth)) {
+                    m.send(sender, "error");
+                    return;
+                }
+                sender.sendMessage("pwd_changed");
+                ConsoleLogger.info(playerNameLowerCase + "'s password changed");
+            }
+
+        });
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/authme/FirstSpawnCommand.java

@@ -0,0 +1,37 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.ConsoleLogger;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.settings.Spawn;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public class FirstSpawnCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // Make sure the command executor is a player
+        try {
+            if (sender instanceof Player) {
+                if (Spawn.getInstance().getFirstSpawn() != null)
+                    ((Player) sender).teleport(Spawn.getInstance().getFirstSpawn());
+                else sender.sendMessage("[AuthMe] First spawn has failed, please try to define the first spawn");
+            } else {
+                sender.sendMessage("[AuthMe] Please use that command in game");
+            }
+        } catch (NullPointerException ex) {
+            ConsoleLogger.showError(ex.getMessage());
+        }
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/authme/ForceLoginCommand.java

@@ -0,0 +1,51 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import org.bukkit.Bukkit;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public class ForceLoginCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        final AuthMe plugin = AuthMe.getInstance();
+
+        // Get the player query
+        String playerName = sender.getName();
+        if(commandArguments.getCount() >= 1)
+            playerName = commandArguments.get(0);
+
+        // Command logic
+        try {
+            @SuppressWarnings("deprecation")
+            Player player = Bukkit.getPlayer(playerName);
+            if (player == null || !player.isOnline()) {
+                sender.sendMessage("Player needs to be online!");
+                return true;
+            }
+            if (!plugin.authmePermissible(player, "authme.canbeforced")) {
+                sender.sendMessage("You cannot force login for the player " + playerName + "!");
+                return true;
+            }
+            plugin.management.performLogin(player, "dontneed", true);
+            sender.sendMessage("Force Login for " + playerName + " performed!");
+        } catch (Exception e) {
+            sender.sendMessage("An error occurred while trying to get that player!");
+        }
+
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/authme/GetEmailCommand.java

@@ -0,0 +1,45 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.cache.auth.PlayerAuth;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.settings.Messages;
+import org.bukkit.command.CommandSender;
+
+public class GetEmailCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        AuthMe plugin = AuthMe.getInstance();
+
+        // Messages instance
+        Messages m = Messages.getInstance();
+
+        // Get the player name
+        String playerName = sender.getName();
+        if(commandArguments.getCount() >= 1)
+            playerName = commandArguments.get(0);
+
+        // Get the authenticated user
+        PlayerAuth auth = plugin.database.getAuth(playerName.toLowerCase());
+        if (auth == null) {
+            m.send(sender, "unknown_user");
+            return true;
+        }
+
+        // Show the email address
+        sender.sendMessage("[AuthMe] " + playerName + "'s email: " + auth.getEmail());
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/authme/GetIpCommand.java

@@ -0,0 +1,41 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import org.bukkit.Bukkit;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public class GetIpCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        final AuthMe plugin = AuthMe.getInstance();
+
+        // Get the player query
+        String playerName = sender.getName();
+        if(commandArguments.getCount() >= 1)
+            playerName = commandArguments.get(0);
+
+        @SuppressWarnings("deprecation")
+        Player player = Bukkit.getPlayer(playerName);
+        if (player == null) {
+            sender.sendMessage("This player is not actually online");
+            return true;
+        }
+        sender.sendMessage(player.getName() + "'s actual IP is : " + player.getAddress().getAddress().getHostAddress() + ":" + player.getAddress().getPort());
+        sender.sendMessage(player.getName() + "'s real IP is : " + plugin.getIP(player));
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/authme/LastLoginCommand.java

@@ -0,0 +1,68 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.cache.auth.PlayerAuth;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.settings.Messages;
+import org.bukkit.command.CommandSender;
+
+import java.util.Date;
+
+public class LastLoginCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        AuthMe plugin = AuthMe.getInstance();
+
+        // Messages instance
+        Messages m = Messages.getInstance();
+
+        // Get the player
+        String playerName = sender.getName();
+        if(commandArguments.getCount() >= 1)
+            playerName = commandArguments.get(0);
+
+        // Validate the player
+        PlayerAuth auth;
+        try {
+            auth = plugin.database.getAuth(playerName.toLowerCase());
+        } catch (NullPointerException e) {
+            m.send(sender, "unknown_user");
+            return true;
+        }
+        if (auth == null) {
+            m.send(sender, "user_unknown");
+            return true;
+        }
+
+        // Get the last login date
+        long lastLogin = auth.getLastLogin();
+        Date date = new Date(lastLogin);
+
+        // Get the difference
+        final long diff = System.currentTimeMillis() - lastLogin;
+
+        // Build the message
+        final String msg = (int) (diff / 86400000) + " days " + (int) (diff / 3600000 % 24) + " hours " + (int) (diff / 60000 % 60) + " mins " + (int) (diff / 1000 % 60) + " secs.";
+
+        // Get the player's last IP
+        String lastIP = auth.getIp();
+
+        // Show the player status
+        sender.sendMessage("[AuthMe] " + playerName + " last login : " + date.toString());
+        sender.sendMessage("[AuthMe] The player " + auth.getNickname() + " is unlogged since " + msg);
+        sender.sendMessage("[AuthMe] Last Player's IP: " + lastIP);
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/authme/PurgeBannedPlayersCommand.java

@@ -0,0 +1,50 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.settings.Settings;
+import org.bukkit.OfflinePlayer;
+import org.bukkit.command.CommandSender;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class PurgeBannedPlayersCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        final AuthMe plugin = AuthMe.getInstance();
+
+        // Get the list of banned players
+        List<String> bannedPlayers = new ArrayList<>();
+        for (OfflinePlayer offlinePlayer : plugin.getServer().getBannedPlayers()) {
+            bannedPlayers.add(offlinePlayer.getName().toLowerCase());
+        }
+
+        // Purge the banned players
+        plugin.database.purgeBanned(bannedPlayers);
+        if (Settings.purgeEssentialsFile && plugin.ess != null)
+            plugin.dataManager.purgeEssentials(bannedPlayers);
+        if (Settings.purgePlayerDat)
+            plugin.dataManager.purgeDat(bannedPlayers);
+        if (Settings.purgeLimitedCreative)
+            plugin.dataManager.purgeLimitedCreative(bannedPlayers);
+        if (Settings.purgeAntiXray)
+            plugin.dataManager.purgeAntiXray(bannedPlayers);
+
+        // Show a status message
+        sender.sendMessage("[AuthMe] Database has been purged correctly");
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/authme/PurgeCommand.java

@@ -0,0 +1,72 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.settings.Settings;
+import org.bukkit.ChatColor;
+import org.bukkit.command.CommandSender;
+
+import java.util.Calendar;
+import java.util.List;
+
+public class PurgeCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        AuthMe plugin = AuthMe.getInstance();
+
+        // Get the days parameter
+        String daysStr = commandArguments.get(0);
+
+        // Convert the days string to an integer value, and make sure it's valid
+        int days;
+        try {
+            days = Integer.valueOf(daysStr);
+        } catch(Exception ex) {
+            sender.sendMessage(ChatColor.RED + "The value you've entered is invalid!");
+            return true;
+        }
+
+        // Validate the value
+        if(days < 30) {
+            sender.sendMessage(ChatColor.RED + "You can only purge data older than 30 days");
+            return true;
+        }
+
+        // Create a calender instance to determine the date
+        Calendar calendar = Calendar.getInstance();
+        calendar.add(Calendar.DATE, -days);
+        long until = calendar.getTimeInMillis();
+
+        // Purge the data, get the purged values
+        List<String> purged = plugin.database.autoPurgeDatabase(until);
+
+        // Show a status message
+        sender.sendMessage(ChatColor.GOLD + "Deleted " + purged.size() + " user accounts");
+
+        // Purge other data
+        if(Settings.purgeEssentialsFile && plugin.ess != null)
+            plugin.dataManager.purgeEssentials(purged);
+        if(Settings.purgePlayerDat)
+            plugin.dataManager.purgeDat(purged);
+        if(Settings.purgeLimitedCreative)
+            plugin.dataManager.purgeLimitedCreative(purged);
+        if(Settings.purgeAntiXray)
+            plugin.dataManager.purgeAntiXray(purged);
+
+        // Show a status message
+        sender.sendMessage(ChatColor.GREEN + "[AuthMe] Database has been purged correctly");
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/authme/PurgeLastPositionCommand.java

@@ -0,0 +1,64 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.ConsoleLogger;
+import fr.xephi.authme.cache.auth.PlayerAuth;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.settings.Messages;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public class PurgeLastPositionCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(final CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        final AuthMe plugin = AuthMe.getInstance();
+
+        // Messages instance
+        final Messages m = Messages.getInstance();
+
+        // Get the player
+        String playerName = sender.getName();
+        if(commandArguments.getCount() >= 1)
+            playerName = commandArguments.get(0);
+        String playerNameLowerCase = playerName.toLowerCase();
+
+        // Purge the last position of the player
+        try {
+            // Get the user auth and make sure the user exists
+            PlayerAuth auth = plugin.database.getAuth(playerNameLowerCase);
+            if (auth == null) {
+                m.send(sender, "unknown_user");
+                return true;
+            }
+
+            // Set the last position
+            auth.setQuitLocX(0D);
+            auth.setQuitLocY(0D);
+            auth.setQuitLocZ(0D);
+            auth.setWorld("world");
+            plugin.database.updateQuitLoc(auth);
+
+            // Show a status message
+            sender.sendMessage(playerNameLowerCase + "'s last position location is now reset");
+
+        } catch (Exception e) {
+            ConsoleLogger.showError("An error occurred while trying to reset location or player do not exist, please see below: ");
+            ConsoleLogger.showError(e.getMessage());
+            if (sender instanceof Player)
+                sender.sendMessage("An error occurred while trying to reset location or player do not exist, please see logs");
+        }
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/authme/RegisterCommand.java

@@ -0,0 +1,92 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.ConsoleLogger;
+import fr.xephi.authme.cache.auth.PlayerAuth;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.security.PasswordSecurity;
+import fr.xephi.authme.settings.Messages;
+import fr.xephi.authme.settings.Settings;
+import org.bukkit.Bukkit;
+import org.bukkit.command.CommandSender;
+
+import java.security.NoSuchAlgorithmException;
+
+public class RegisterCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(final CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        final AuthMe plugin = AuthMe.getInstance();
+
+        // Messages instance
+        final Messages m = Messages.getInstance();
+
+        // Get the player name and password
+        final String playerName = commandArguments.get(0);
+        final String playerPass = commandArguments.get(1);
+        final String playerNameLowerCase = playerName.toLowerCase();
+        final String playerPassLowerCase = playerPass.toLowerCase();
+
+        // Command logic
+        if (playerPassLowerCase.contains("delete") || playerPassLowerCase.contains("where") || playerPassLowerCase.contains("insert") || playerPassLowerCase.contains("modify") || playerPassLowerCase.contains("from") || playerPassLowerCase.contains("select") || playerPassLowerCase.contains(";") || playerPassLowerCase.contains("null") || !playerPassLowerCase.matches(Settings.getPassRegex)) {
+            m.send(sender, "password_error");
+            return true;
+        }
+        if (playerPassLowerCase.equalsIgnoreCase(playerName)) {
+            m.send(sender, "password_error_nick");
+            return true;
+        }
+        if (playerPassLowerCase.length() < Settings.getPasswordMinLen || playerPassLowerCase.length() > Settings.passwordMaxLength) {
+            m.send(sender, "pass_len");
+            return true;
+        }
+        if (!Settings.unsafePasswords.isEmpty()) {
+            if (Settings.unsafePasswords.contains(playerPassLowerCase)) {
+                m.send(sender, "password_error_unsafe");
+                return true;
+            }
+        }
+        plugin.getServer().getScheduler().runTaskAsynchronously(plugin, new Runnable() {
+            @SuppressWarnings("deprecation")
+            @Override
+            public void run() {
+                try {
+                    if (plugin.database.isAuthAvailable(playerNameLowerCase)) {
+                        m.send(sender, "user_regged");
+                        return;
+                    }
+                    String hash = PasswordSecurity.getHash(Settings.getPasswordHash, playerPassLowerCase, playerNameLowerCase);
+                    PlayerAuth auth = new PlayerAuth(playerNameLowerCase, hash, "192.168.0.1", 0L, "your@email.com", playerName);
+                    if (PasswordSecurity.userSalt.containsKey(playerNameLowerCase) && PasswordSecurity.userSalt.get(playerNameLowerCase) != null)
+                        auth.setSalt(PasswordSecurity.userSalt.get(playerNameLowerCase));
+                    else auth.setSalt("");
+                    if (!plugin.database.saveAuth(auth)) {
+                        m.send(sender, "error");
+                        return;
+                    }
+                    plugin.database.setUnlogged(playerNameLowerCase);
+                    if (Bukkit.getPlayerExact(playerName) != null)
+                        Bukkit.getPlayerExact(playerName).kickPlayer("An admin just registered you, please log again");
+                    m.send(sender, "registered");
+                    ConsoleLogger.info(playerNameLowerCase + " registered");
+                } catch (NoSuchAlgorithmException ex) {
+                    ConsoleLogger.showError(ex.getMessage());
+                    m.send(sender, "error");
+                }
+
+            }
+        });
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/authme/ReloadCommand.java

@@ -0,0 +1,58 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.ConsoleLogger;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+
+import fr.xephi.authme.settings.Messages;
+import fr.xephi.authme.settings.Settings;
+import fr.xephi.authme.util.Profiler;
+//import org.bukkit.ChatColor;
+import org.bukkit.command.CommandSender;
+
+public class ReloadCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // Profile the reload process
+        Profiler p = new Profiler(true);
+
+        // AuthMe plugin instance
+        AuthMe plugin = AuthMe.getInstance();
+
+        // Messages instance
+        Messages m = Messages.getInstance();
+
+        // Show a status message
+        //sender.sendMessage(ChatColor.YELLOW + "Reloading AuthMeReloaded...");
+
+        try {
+            Settings.reload();
+            plugin.getModuleManager().reloadModules();
+            Messages.getInstance().reloadMessages();
+            plugin.setupDatabase();
+        } catch (Exception e) {
+            ConsoleLogger.showError("Fatal error occurred! AuthMe instance ABORTED!");
+            ConsoleLogger.writeStackTrace(e);
+            plugin.stopOrUnload();
+            return false;
+        }
+
+        // Show a status message
+        m.send(sender, "reload");
+
+        // AuthMeReloaded reloaded, show a status message
+        //sender.sendMessage(ChatColor.GREEN + "AuthMeReloaded has been reloaded successfully, took " + p.getTimeFormatted() + "!");
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/authme/ResetNameCommand.java

@@ -0,0 +1,42 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.cache.auth.PlayerAuth;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import org.bukkit.Bukkit;
+import org.bukkit.command.CommandSender;
+
+import java.util.List;
+
+public class ResetNameCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        final AuthMe plugin = AuthMe.getInstance();
+
+        // Command logic
+        Bukkit.getScheduler().runTaskAsynchronously(plugin, new Runnable() {
+            @Override
+            public void run() {
+                List<PlayerAuth> authentications = plugin.database.getAllAuths();
+                for(PlayerAuth auth : authentications) {
+                    auth.setRealName("Player");
+                    plugin.database.updateSession(auth);
+                }
+            }
+        });
+
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/authme/SetEmailCommand.java

@@ -0,0 +1,63 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.cache.auth.PlayerAuth;
+import fr.xephi.authme.cache.auth.PlayerCache;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.settings.Messages;
+import fr.xephi.authme.settings.Settings;
+import org.bukkit.command.CommandSender;
+
+public class SetEmailCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        AuthMe plugin = AuthMe.getInstance();
+
+        // Messages instance
+        Messages m = Messages.getInstance();
+
+        // Get the player name and email address
+        String playerName = commandArguments.get(0);
+        String playerEmail = commandArguments.get(1);
+
+        // Validate the email address
+        if (!Settings.isEmailCorrect(playerEmail)) {
+            m.send(sender, "email_invalid");
+            return true;
+        }
+
+        // Validate the user
+        PlayerAuth auth = plugin.database.getAuth(playerName.toLowerCase());
+        if (auth == null) {
+            m.send(sender, "unknown_user");
+            return true;
+        }
+
+        // Set the email address
+        auth.setEmail(playerEmail);
+        if (!plugin.database.updateEmail(auth)) {
+            m.send(sender, "error");
+            return true;
+        }
+
+        // Update the player cache
+        if (PlayerCache.getInstance().getAuth(playerName.toLowerCase()) != null)
+            PlayerCache.getInstance().updatePlayer(auth);
+
+        // Show a status message
+        m.send(sender, "email_changed");
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/authme/SetFirstSpawnCommand.java

@@ -0,0 +1,36 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.ConsoleLogger;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.settings.Spawn;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public class SetFirstSpawnCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        try {
+            if (sender instanceof Player) {
+                if (Spawn.getInstance().setFirstSpawn(((Player) sender).getLocation()))
+                    sender.sendMessage("[AuthMe] Correctly defined new first spawn point");
+                else sender.sendMessage("[AuthMe] SetFirstSpawn has failed, please retry");
+            } else {
+                sender.sendMessage("[AuthMe] Please use that command in game");
+            }
+        } catch (NullPointerException ex) {
+            ConsoleLogger.showError(ex.getMessage());
+        }
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/authme/SetSpawnCommand.java

@@ -0,0 +1,39 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.ConsoleLogger;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.settings.Spawn;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public class SetSpawnCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // Make sure the command executor is a player
+        try {
+            if (sender instanceof Player) {
+                if (Spawn.getInstance().setSpawn(((Player) sender).getLocation())) {
+                    sender.sendMessage("[AuthMe] Correctly defined new spawn point");
+                } else {
+                    sender.sendMessage("[AuthMe] SetSpawn has failed, please retry");
+                }
+            } else {
+                sender.sendMessage("[AuthMe] Please use that command in game");
+            }
+        } catch (NullPointerException ex) {
+            ConsoleLogger.showError(ex.getMessage());
+        }
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/authme/SpawnCommand.java

@@ -0,0 +1,37 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.ConsoleLogger;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.settings.Spawn;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public class SpawnCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // Make sure the command executor is a player
+        try {
+            if (sender instanceof Player) {
+                if (Spawn.getInstance().getSpawn() != null)
+                    ((Player) sender).teleport(Spawn.getInstance().getSpawn());
+                else sender.sendMessage("[AuthMe] Spawn has failed, please try to define the spawn");
+            } else {
+                sender.sendMessage("[AuthMe] Please use that command in game");
+            }
+        } catch (NullPointerException ex) {
+            ConsoleLogger.showError(ex.getMessage());
+        }
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/authme/SwitchAntiBotCommand.java

@@ -0,0 +1,56 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.command.help.HelpProvider;
+import org.bukkit.ChatColor;
+import org.bukkit.command.CommandSender;
+
+public class SwitchAntiBotCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(final CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        final AuthMe plugin = AuthMe.getInstance();
+
+        // Get the new state
+        String newState = plugin.getAntiBotModMode() ? "OFF" : "ON";
+        if(commandArguments.getCount() >= 1)
+            newState = commandArguments.get(0);
+
+        // Enable the mod
+        if(newState.equalsIgnoreCase("ON")) {
+            plugin.switchAntiBotMod(true);
+            sender.sendMessage("[AuthMe] AntiBotMod enabled");
+            return true;
+        }
+
+        // Disable the mod
+        if(newState.equalsIgnoreCase("OFF")) {
+            plugin.switchAntiBotMod(false);
+            sender.sendMessage("[AuthMe] AntiBotMod disabled");
+            return true;
+        }
+
+        // Show the invalid arguments warning
+        sender.sendMessage(ChatColor.DARK_RED + "Invalid AntiBot mode!");
+
+        // Show the command argument help
+        HelpProvider.showHelp(sender, commandReference, commandReference, true, false, true, false, false, false);
+
+        // Show the command to use for detailed help
+        CommandParts helpCommandReference = new CommandParts(commandReference.getRange(1));
+        sender.sendMessage(ChatColor.GOLD + "Detailed help: " + ChatColor.WHITE + "/" + commandReference.get(0) + " help " + helpCommandReference);
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/authme/UnregisterCommand.java

@@ -0,0 +1,98 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.ConsoleLogger;
+import fr.xephi.authme.Utils;
+import fr.xephi.authme.cache.auth.PlayerCache;
+import fr.xephi.authme.cache.limbo.LimboCache;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.events.SpawnTeleportEvent;
+import fr.xephi.authme.settings.Messages;
+import fr.xephi.authme.settings.Settings;
+import fr.xephi.authme.task.MessageTask;
+import fr.xephi.authme.task.TimeoutTask;
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.bukkit.potion.PotionEffect;
+import org.bukkit.potion.PotionEffectType;
+import org.bukkit.scheduler.BukkitScheduler;
+import org.bukkit.scheduler.BukkitTask;
+
+public class UnregisterCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(final CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        final AuthMe plugin = AuthMe.getInstance();
+
+        // Messages instance
+        final Messages m = Messages.getInstance();
+
+        // Get the player name
+        String playerName = commandArguments.get(0);
+        String playerNameLowerCase = playerName.toLowerCase();
+
+        // Make sure the user is valid
+        if (!plugin.database.isAuthAvailable(playerNameLowerCase)) {
+            m.send(sender, "user_unknown");
+            return true;
+        }
+
+        // Remove the player
+        if (!plugin.database.removeAuth(playerNameLowerCase)) {
+            m.send(sender, "error");
+            return true;
+        }
+
+        // Unregister the player
+        @SuppressWarnings("deprecation")
+        Player target = Bukkit.getPlayer(playerNameLowerCase);
+        PlayerCache.getInstance().removePlayer(playerNameLowerCase);
+        Utils.setGroup(target, Utils.GroupType.UNREGISTERED);
+        if (target != null) {
+            if (target.isOnline()) {
+                if (Settings.isTeleportToSpawnEnabled && !Settings.noTeleport) {
+                    Location spawn = plugin.getSpawnLocation(target);
+                    SpawnTeleportEvent tpEvent = new SpawnTeleportEvent(target, target.getLocation(), spawn, false);
+                    plugin.getServer().getPluginManager().callEvent(tpEvent);
+                    if (!tpEvent.isCancelled()) {
+                        target.teleport(tpEvent.getTo());
+                    }
+                }
+                LimboCache.getInstance().addLimboPlayer(target);
+                int delay = Settings.getRegistrationTimeout * 20;
+                int interval = Settings.getWarnMessageInterval;
+                BukkitScheduler scheduler = sender.getServer().getScheduler();
+                if (delay != 0) {
+                    BukkitTask id = scheduler.runTaskLaterAsynchronously(plugin, new TimeoutTask(plugin, playerNameLowerCase, target), delay);
+                    LimboCache.getInstance().getLimboPlayer(playerNameLowerCase).setTimeoutTaskId(id);
+                }
+                LimboCache.getInstance().getLimboPlayer(playerNameLowerCase).setMessageTaskId(scheduler.runTaskAsynchronously(plugin, new MessageTask(plugin, playerNameLowerCase, m.send("reg_msg"), interval)));
+                if (Settings.applyBlindEffect)
+                    target.addPotionEffect(new PotionEffect(PotionEffectType.BLINDNESS, Settings.getRegistrationTimeout * 20, 2));
+                if (!Settings.isMovementAllowed && Settings.isRemoveSpeedEnabled) {
+                    target.setWalkSpeed(0.0f);
+                    target.setFlySpeed(0.0f);
+                }
+                m.send(target, "unregistered");
+            }
+        }
+
+        // Show a status message
+        m.send(sender, "unregistered");
+        ConsoleLogger.info(playerName + " unregistered");
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/authme/VersionCommand.java

@@ -0,0 +1,79 @@
+package fr.xephi.authme.command.executable.authme;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import org.bukkit.Bukkit;
+import org.bukkit.ChatColor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public class VersionCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender           The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // Show some version info
+        sender.sendMessage(ChatColor.GOLD + "==========[ " + AuthMe.PLUGIN_NAME.toUpperCase() + " ABOUT ]==========");
+        sender.sendMessage(ChatColor.GOLD + "Version: " + ChatColor.WHITE + AuthMe.PLUGIN_NAME + " v" + AuthMe.getVersionName() + ChatColor.GRAY + " (code: " + AuthMe.getVersionCode() + ")");
+        sender.sendMessage(ChatColor.GOLD + "Developers:");
+        printDeveloper(sender, "Xephi", "xephi", "Lead Developer");
+        printDeveloper(sender, "Sgdc3", "sgdc3", "Code Contributor");
+        printDeveloper(sender, "Tim Visee", "timvisee", "Code Contributor");
+        sender.sendMessage(ChatColor.GOLD + "Website: " + ChatColor.WHITE + "http://dev.bukkit.org/bukkit-plugins/authme-reloaded/");
+        sender.sendMessage(ChatColor.GOLD + "License: " + ChatColor.WHITE + "GNU GPL v3.0" + ChatColor.GRAY + ChatColor.ITALIC + " (See LICENSE file)");
+        sender.sendMessage(ChatColor.GOLD + "Copyright: " + ChatColor.WHITE + "Copyright (c) Xephi 2015. All rights reserved.");
+        return true;
+    }
+
+    /**
+     * Print a developer with proper styling.
+     *
+     * @param sender The command sender.
+     * @param name The display name of the developer.
+     * @param minecraftName The Minecraft username of the developer, if available.
+     * @param function The function of the developer.
+     */
+    @SuppressWarnings("StringConcatenationInsideStringBufferAppend")
+    private void printDeveloper(CommandSender sender, String name, String minecraftName, String function) {
+        // Print the name
+        StringBuilder msg = new StringBuilder();
+        msg.append(" " + ChatColor.WHITE);
+        msg.append(name);
+
+        // Append the Minecraft name, if available
+        if(minecraftName.length() != 0)
+            msg.append(ChatColor.GRAY + " // " + ChatColor.WHITE + minecraftName);
+        msg.append(ChatColor.GRAY + "" + ChatColor.ITALIC + " (" + function + ")");
+
+        // Show the online status
+        if(minecraftName.length() != 0)
+            if(isPlayerOnline(minecraftName))
+                msg.append(ChatColor.GREEN + "" + ChatColor.ITALIC + " (In-Game)");
+
+        // Print the message
+        sender.sendMessage(msg.toString());
+    }
+
+    /**
+     * Check whether a player is online.
+     *
+     * @param minecraftName The Minecraft player name.
+     *
+     * @return True if the player is online, false otherwise.
+     */
+    private boolean isPlayerOnline(String minecraftName) {
+        for(Player player : Bukkit.getOnlinePlayers())
+            if(player.getName().equalsIgnoreCase(minecraftName))
+                return true;
+        return false;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/captcha/CaptchaCommand.java

@@ -0,0 +1,82 @@
+package fr.xephi.authme.command.executable.captcha;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.cache.auth.PlayerCache;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.security.RandomString;
+import fr.xephi.authme.settings.Messages;
+import fr.xephi.authme.settings.Settings;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public class CaptchaCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        final AuthMe plugin = AuthMe.getInstance();
+
+        // Messages instance
+        final Messages m = Messages.getInstance();
+
+        // Random string instance, for captcha generation (I think) -- timvisee
+        RandomString randStr = new RandomString(Settings.captchaLength);
+
+        // Get the parameter values
+        String captcha = commandArguments.get(0);
+
+        // Make sure the current command executor is a player
+        if(!(sender instanceof Player)) {
+            return true;
+        }
+
+        // Get the player instance and name
+        final Player player = (Player) sender;
+        final String playerNameLowerCase = player.getName().toLowerCase();
+
+        // Command logic
+        if (PlayerCache.getInstance().isAuthenticated(playerNameLowerCase)) {
+            m.send(player, "logged_in");
+            return true;
+        }
+
+        if (!Settings.useCaptcha) {
+            m.send(player, "usage_log");
+            return true;
+        }
+
+        if (!plugin.cap.containsKey(playerNameLowerCase)) {
+            m.send(player, "usage_log");
+            return true;
+        }
+
+        if (Settings.useCaptcha && !captcha.equals(plugin.cap.get(playerNameLowerCase))) {
+            plugin.cap.remove(playerNameLowerCase);
+            plugin.cap.put(playerNameLowerCase, randStr.nextString());
+            for (String s : m.send("wrong_captcha")) {
+                player.sendMessage(s.replace("THE_CAPTCHA", plugin.cap.get(playerNameLowerCase)));
+            }
+            return true;
+        }
+
+        try {
+            plugin.captcha.remove(playerNameLowerCase);
+            plugin.cap.remove(playerNameLowerCase);
+        } catch (NullPointerException ignored) { }
+
+        // Show a status message
+        m.send(player, "valid_captcha");
+        m.send(player, "login_msg");
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/changepassword/ChangePasswordCommand.java

@@ -0,0 +1,74 @@
+package fr.xephi.authme.command.executable.changepassword;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.cache.auth.PlayerCache;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.settings.Messages;
+import fr.xephi.authme.settings.Settings;
+import fr.xephi.authme.task.ChangePasswordTask;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public class ChangePasswordCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        final AuthMe plugin = AuthMe.getInstance();
+
+        // Messages instance
+        final Messages m = Messages.getInstance();
+
+        // Get the passwords
+        String playerPass = commandArguments.get(0);
+        String playerPassVerify = commandArguments.get(1);
+
+        // Make sure the current command executor is a player
+        if(!(sender instanceof Player)) {
+            return true;
+        }
+
+        // Get the player instance and make sure it's authenticated
+        Player player = (Player) sender;
+        String name = player.getName().toLowerCase();
+        if (!PlayerCache.getInstance().isAuthenticated(name)) {
+            m.send(player, "not_logged_in");
+            return true;
+        }
+
+        // Make sure the password is allowed
+        String playerPassLowerCase = playerPass.toLowerCase();
+        if (playerPassLowerCase.contains("delete") || playerPassLowerCase.contains("where") || playerPassLowerCase.contains("insert") || playerPassLowerCase.contains("modify") || playerPassLowerCase.contains("from") || playerPassLowerCase.contains("select") || playerPassLowerCase.contains(";") || playerPassLowerCase.contains("null") || !playerPassLowerCase.matches(Settings.getPassRegex)) {
+            m.send(player, "password_error");
+            return true;
+        }
+        if (playerPassLowerCase.equalsIgnoreCase(name)) {
+            m.send(player, "password_error_nick");
+            return true;
+        }
+        if (playerPassLowerCase.length() < Settings.getPasswordMinLen || playerPassLowerCase.length() > Settings.passwordMaxLength) {
+            m.send(player, "pass_len");
+            return true;
+        }
+        if (!Settings.unsafePasswords.isEmpty()) {
+            if (Settings.unsafePasswords.contains(playerPassLowerCase)) {
+                m.send(player, "password_error_unsafe");
+                return true;
+            }
+        }
+
+        // Set the password
+        plugin.getServer().getScheduler().runTaskAsynchronously(plugin, new ChangePasswordTask(plugin, player, playerPass, playerPassVerify));
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/converter/ConverterCommand.java

@@ -0,0 +1,108 @@
+package fr.xephi.authme.command.executable.converter;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.converter.*;
+import fr.xephi.authme.settings.Messages;
+import org.bukkit.Bukkit;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public class ConverterCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        final AuthMe plugin = AuthMe.getInstance();
+
+        // Messages instance
+        final Messages m = Messages.getInstance();
+
+        // Get the conversion job
+        String job = commandArguments.get(0);
+
+        // Determine the job type
+        ConvertType jobType = ConvertType.fromName(job);
+        if (jobType == null) {
+            m.send(sender, "error");
+            return true;
+        }
+
+        // Get the proper converter instance
+        Converter converter = null;
+        switch (jobType) {
+        case ftsql:
+            converter = new FlatToSql();
+            break;
+        case ftsqlite:
+            converter = new FlatToSqlite(sender);
+            break;
+        case xauth:
+            converter = new xAuthConverter(plugin, sender);
+            break;
+        case crazylogin:
+            converter = new CrazyLoginConverter(plugin, sender);
+            break;
+        case rakamak:
+            converter = new RakamakConverter(plugin, sender);
+            break;
+        case royalauth:
+            converter = new RoyalAuthConverter(plugin);
+            break;
+        case vauth:
+            converter = new vAuthConverter(plugin, sender);
+            break;
+        case sqltoflat:
+            converter = new SqlToFlat(plugin, sender);
+            break;
+        default:
+            break;
+        }
+
+        // Run the convert job
+        Bukkit.getScheduler().runTaskAsynchronously(plugin, converter);
+
+        // Show a status message
+        sender.sendMessage("[AuthMe] Successfully converted from " + jobType.getName());
+        return true;
+    }
+
+    public enum ConvertType {
+        ftsql("flattosql"),
+        ftsqlite("flattosqlite"),
+        xauth("xauth"),
+        crazylogin("crazylogin"),
+        rakamak("rakamak"),
+        royalauth("royalauth"),
+        vauth("vauth"),
+        sqltoflat("sqltoflat");
+
+        String name;
+
+        ConvertType(String name) {
+            this.name = name;
+        }
+
+        String getName() {
+            return this.name;
+        }
+
+        public static ConvertType fromName(String name) {
+            for (ConvertType type : ConvertType.values()) {
+                if (type.getName().equalsIgnoreCase(name))
+                    return type;
+            }
+            return null;
+        }
+    }
+}

src/main/java/fr/xephi/authme/command/executable/email/AddEmailCommand.java

@@ -0,0 +1,90 @@
+package fr.xephi.authme.command.executable.email;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.cache.auth.PlayerAuth;
+import fr.xephi.authme.cache.auth.PlayerCache;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.settings.Messages;
+import fr.xephi.authme.settings.Settings;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public class AddEmailCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        final AuthMe plugin = AuthMe.getInstance();
+
+        // Messages instance
+        final Messages m = Messages.getInstance();
+
+        // Get the parameter values
+        String playerMail = commandArguments.get(0);
+        String playerMailVerify = commandArguments.get(1);
+
+        // Make sure the current command executor is a player
+        if(!(sender instanceof Player)) {
+            return true;
+        }
+
+        // Get the player instance and name
+        final Player player = (Player) sender;
+        final String playerName = player.getName();
+
+        // Command logic
+        if (Settings.getmaxRegPerEmail > 0) {
+            if (!plugin.authmePermissible(sender, "authme.allow2accounts") && plugin.database.getAllAuthsByEmail(playerMail).size() >= Settings.getmaxRegPerEmail) {
+                m.send(player, "max_reg");
+                return true;
+            }
+        }
+
+        if (playerMail.equals(playerMailVerify) && PlayerCache.getInstance().isAuthenticated(playerName)) {
+            PlayerAuth auth = PlayerCache.getInstance().getAuth(playerName);
+
+            if (auth.getEmail() == null || (!auth.getEmail().equals("your@email.com") && !auth.getEmail().isEmpty())) {
+                m.send(player, "usage_email_change");
+                return true;
+            }
+
+            if (!Settings.isEmailCorrect(playerMail)) {
+                m.send(player, "email_invalid");
+                return true;
+            }
+
+            auth.setEmail(playerMail);
+
+            if (!plugin.database.updateEmail(auth)) {
+                m.send(player, "error");
+                return true;
+            }
+
+            PlayerCache.getInstance().updatePlayer(auth);
+            m.send(player, "email_added");
+            player.sendMessage(auth.getEmail());
+
+        } else if (PlayerCache.getInstance().isAuthenticated(playerName)) {
+            m.send(player, "email_confirm");
+
+        } else {
+            if (!plugin.database.isAuthAvailable(playerName)) {
+                m.send(player, "login_msg");
+            } else {
+                m.send(player, "reg_email_msg");
+            }
+        }
+
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/email/ChangeEmailCommand.java

@@ -0,0 +1,88 @@
+package fr.xephi.authme.command.executable.email;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.cache.auth.PlayerAuth;
+import fr.xephi.authme.cache.auth.PlayerCache;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.settings.Messages;
+import fr.xephi.authme.settings.Settings;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+import java.util.Arrays;
+
+public class ChangeEmailCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        final AuthMe plugin = AuthMe.getInstance();
+
+        // Messages instance
+        final Messages m = Messages.getInstance();
+
+        // Get the parameter values
+        String playerMailOld = commandArguments.get(0);
+        String playerMailNew = commandArguments.get(1);
+
+        // Make sure the current command executor is a player
+        if(!(sender instanceof Player)) {
+            return true;
+        }
+
+        // Get the player instance and name
+        final Player player = (Player) sender;
+        final String playerName = player.getName();
+
+        // Command logic
+        if (Settings.getmaxRegPerEmail > 0) {
+            if (!plugin.authmePermissible(sender, "authme.allow2accounts") && plugin.database.getAllAuthsByEmail(playerMailNew).size() >= Settings.getmaxRegPerEmail) {
+                m.send(player, "max_reg");
+                return true;
+            }
+        }
+        if (PlayerCache.getInstance().isAuthenticated(playerName)) {
+            PlayerAuth auth = PlayerCache.getInstance().getAuth(playerName);
+            if (auth.getEmail() == null || auth.getEmail().equals("your@email.com") || auth.getEmail().isEmpty()) {
+                m.send(player, "usage_email_add");
+                return true;
+            }
+            if (!playerMailOld.equals(auth.getEmail())) {
+                m.send(player, "old_email_invalid");
+                return true;
+            }
+            if (!Settings.isEmailCorrect(playerMailNew)) {
+                m.send(player, "new_email_invalid");
+                return true;
+            }
+            auth.setEmail(playerMailNew);
+            if (!plugin.database.updateEmail(auth)) {
+                m.send(player, "error");
+                return true;
+            }
+            PlayerCache.getInstance().updatePlayer(auth);
+            m.send(player, "email_changed");
+            player.sendMessage(Arrays.toString(m.send("email_defined")) + auth.getEmail());
+        } else if (PlayerCache.getInstance().isAuthenticated(playerName)) {
+            m.send(player, "email_confirm");
+        } else {
+            if (!plugin.database.isAuthAvailable(playerName)) {
+                m.send(player, "login_msg");
+            } else {
+                m.send(player, "reg_email_msg");
+            }
+        }
+
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/email/RecoverEmailCommand.java

@@ -0,0 +1,96 @@
+package fr.xephi.authme.command.executable.email;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.ConsoleLogger;
+import fr.xephi.authme.cache.auth.PlayerAuth;
+import fr.xephi.authme.cache.auth.PlayerCache;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.security.PasswordSecurity;
+import fr.xephi.authme.security.RandomString;
+import fr.xephi.authme.settings.Messages;
+import fr.xephi.authme.settings.Settings;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+import java.security.NoSuchAlgorithmException;
+
+public class RecoverEmailCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        final AuthMe plugin = AuthMe.getInstance();
+
+        // Messages instance
+        final Messages m = Messages.getInstance();
+
+        // Get the parameter values
+        String playerMail = commandArguments.get(0);
+
+        // Make sure the current command executor is a player
+        if(!(sender instanceof Player)) {
+            return true;
+        }
+
+        // Get the player instance and name
+        final Player player = (Player) sender;
+        final String playerName = player.getName();
+
+        // Command logic
+        if (plugin.mail == null) {
+            m.send(player, "error");
+            return true;
+        }
+        if (plugin.database.isAuthAvailable(playerName)) {
+            if (PlayerCache.getInstance().isAuthenticated(playerName)) {
+                m.send(player, "logged_in");
+                return true;
+            }
+            try {
+                RandomString rand = new RandomString(Settings.getRecoveryPassLength);
+                String thePass = rand.nextString();
+                String hashNew = PasswordSecurity.getHash(Settings.getPasswordHash, thePass, playerName);
+                PlayerAuth auth;
+                if (PlayerCache.getInstance().isAuthenticated(playerName)) {
+                    auth = PlayerCache.getInstance().getAuth(playerName);
+                } else if (plugin.database.isAuthAvailable(playerName)) {
+                    auth = plugin.database.getAuth(playerName);
+                } else {
+                    m.send(player, "unknown_user");
+                    return true;
+                }
+                if (Settings.getmailAccount.equals("") || Settings.getmailAccount.isEmpty()) {
+                    m.send(player, "error");
+                    return true;
+                }
+
+                if (!playerMail.equalsIgnoreCase(auth.getEmail()) || playerMail.equalsIgnoreCase("your@email.com") || auth.getEmail().equalsIgnoreCase("your@email.com")) {
+                    m.send(player, "email_invalid");
+                    return true;
+                }
+                auth.setHash(hashNew);
+                plugin.database.updatePassword(auth);
+                plugin.mail.main(auth, thePass);
+                m.send(player, "email_send");
+            } catch (NoSuchAlgorithmException | NoClassDefFoundError ex) {
+                ex.printStackTrace();
+                ConsoleLogger.showError(ex.getMessage());
+                m.send(sender, "error");
+            }
+        } else {
+            m.send(player, "reg_email_msg");
+        }
+
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/login/LoginCommand.java

@@ -0,0 +1,40 @@
+package fr.xephi.authme.command.executable.login;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public class LoginCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        final AuthMe plugin = AuthMe.getInstance();
+
+        // Make sure the current command executor is a player
+        if(!(sender instanceof Player)) {
+            return true;
+        }
+
+        // Get the player instance
+        final Player player = (Player) sender;
+
+        // Get the password
+        String playerPass = commandArguments.get(0);
+
+        // Login the player
+        plugin.management.performLogin(player, playerPass, false);
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/logout/LogoutCommand.java

@@ -0,0 +1,37 @@
+package fr.xephi.authme.command.executable.logout;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public class LogoutCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        final AuthMe plugin = AuthMe.getInstance();
+
+        // Make sure the current command executor is a player
+        if(!(sender instanceof Player)) {
+            return true;
+        }
+
+        // Get the player instance
+        final Player player = (Player) sender;
+
+        // Logout the player
+        plugin.management.performLogout(player);
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/register/RegisterCommand.java

@@ -0,0 +1,69 @@
+package fr.xephi.authme.command.executable.register;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.security.RandomString;
+import fr.xephi.authme.settings.Messages;
+import fr.xephi.authme.settings.Settings;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public class RegisterCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        final AuthMe plugin = AuthMe.getInstance();
+
+        // Messages instance
+        final Messages m = Messages.getInstance();
+
+        // Make sure the sender is a player
+        if (!(sender instanceof Player)) {
+            sender.sendMessage("Player Only! Use 'authme register <playername> <password>' instead");
+            return true;
+        }
+
+        // Make sure the command arguments are valid
+        final Player player = (Player) sender;
+        if (commandArguments.getCount() == 0 || (Settings.getEnablePasswordVerifier && commandArguments.getCount() < 2)) {
+            m.send(player, "usage_reg");
+            return true;
+        }
+
+        if (Settings.emailRegistration && !Settings.getmailAccount.isEmpty()) {
+            if (Settings.doubleEmailCheck) {
+                if (commandArguments.getCount() < 2 || !commandArguments.get(0).equals(commandArguments.get(1))) {
+                    m.send(player, "usage_reg");
+                    return true;
+                }
+            }
+            final String email = commandArguments.get(0);
+            if (!Settings.isEmailCorrect(email)) {
+                m.send(player, "email_invalid");
+                return true;
+            }
+            RandomString rand = new RandomString(Settings.getRecoveryPassLength);
+            final String thePass = rand.nextString();
+            plugin.management.performRegister(player, thePass, email);
+            return true;
+        }
+        if (commandArguments.getCount() > 1 && Settings.getEnablePasswordVerifier)
+            if (!commandArguments.get(0).equals(commandArguments.get(1))) {
+                m.send(player, "password_error");
+                return true;
+            }
+        plugin.management.performRegister(player, commandArguments.get(0), "");
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/executable/unregister/UnregisterCommand.java

@@ -0,0 +1,52 @@
+package fr.xephi.authme.command.executable.unregister;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.cache.auth.PlayerCache;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.ExecutableCommand;
+import fr.xephi.authme.settings.Messages;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public class UnregisterCommand extends ExecutableCommand {
+
+    /**
+     * Execute the command.
+     *
+     * @param sender The command sender.
+     * @param commandReference The command reference.
+     * @param commandArguments The command arguments.
+     *
+     * @return True if the command was executed successfully, false otherwise.
+     */
+    @Override
+    public boolean executeCommand(CommandSender sender, CommandParts commandReference, CommandParts commandArguments) {
+        // AuthMe plugin instance
+        final AuthMe plugin = AuthMe.getInstance();
+
+        // Messages instance
+        final Messages m = Messages.getInstance();
+
+        // Make sure the current command executor is a player
+        if(!(sender instanceof Player)) {
+            return true;
+        }
+
+        // Get the password
+        String playerPass = commandArguments.get(0);
+
+        // Get the player instance and name
+        final Player player = (Player) sender;
+        final String playerNameLowerCase = player.getName().toLowerCase();
+
+        // Make sure the player is authenticated
+        if (!PlayerCache.getInstance().isAuthenticated(playerNameLowerCase)) {
+            m.send(player, "not_logged_in");
+            return true;
+        }
+
+        // Unregister the player
+        plugin.management.performUnregister(player, playerPass, false);
+        return true;
+    }
+}

src/main/java/fr/xephi/authme/command/help/HelpPrinter.java

@@ -0,0 +1,195 @@
+package fr.xephi.authme.command.help;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.command.CommandArgumentDescription;
+import fr.xephi.authme.command.CommandDescription;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.command.CommandPermissions;
+import fr.xephi.authme.util.StringUtils;
+import org.bukkit.ChatColor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+
+public class HelpPrinter {
+
+    /**
+     * Print the command help information.
+     *
+     * @param sender The command sender to print the help to.
+     * @param command The command to print.
+     * @param commandReference The command reference used.
+     */
+    public static void printCommand(CommandSender sender, CommandDescription command, CommandParts commandReference) {
+        // Print the proper command syntax
+        sender.sendMessage(ChatColor.GOLD + "Command: " + HelpSyntaxHelper.getCommandSyntax(command, commandReference, null, true));
+    }
+
+    /**
+     * Print the command help description information. This will print both the short, as the detailed description if available.
+     *
+     * @param sender The command sender to print the help to.
+     * @param command The command to print the description help for.
+     */
+    public static void printCommandDescription(CommandSender sender, CommandDescription command) {
+        // Print the regular description, if available
+        if(command.hasDescription())
+            sender.sendMessage(ChatColor.GOLD + "Short Description: " + ChatColor.WHITE + command.getDescription());
+
+        // Print the detailed description, if available
+        if(command.hasDetailedDescription()) {
+            sender.sendMessage(ChatColor.GOLD + "Detailed Description:");
+            sender.sendMessage(ChatColor.WHITE + " " + command.getDetailedDescription());
+        }
+    }
+
+    /**
+     * Print the command help arguments information if available.
+     *
+     * @param sender The command sender to print the help to.
+     * @param command The command to print the argument help for.
+     */
+    @SuppressWarnings("StringConcatenationInsideStringBufferAppend")
+    public static void printArguments(CommandSender sender, CommandDescription command) {
+        // Make sure there are any commands to print
+        if(!command.hasArguments() && command.getMaximumArguments() >= 0)
+            return;
+
+        // Print the header
+        sender.sendMessage(ChatColor.GOLD + "Arguments:");
+
+        // Print each argument
+        for(CommandArgumentDescription arg : command.getArguments()) {
+            // Create a string builder to build the syntax in
+            StringBuilder argString = new StringBuilder();
+            argString.append(" " + ChatColor.YELLOW + ChatColor.ITALIC + arg.getLabel() + " : " + ChatColor.WHITE + arg.getDescription());
+
+            // Suffix a note if the command is optional
+            if(arg.isOptional())
+                argString.append(ChatColor.GRAY + "" + ChatColor.ITALIC + " (Optional)");
+
+            // Print the syntax
+            sender.sendMessage(argString.toString());
+        }
+
+        // Show the unlimited arguments argument
+        if(command.getMaximumArguments() < 0)
+            sender.sendMessage(" " + ChatColor.YELLOW + ChatColor.ITALIC + "... : " + ChatColor.WHITE + "Any additional arguments." + ChatColor.GRAY + ChatColor.ITALIC + " (Optional)");
+    }
+
+    /**
+     * Print the command help permissions information if available.
+     *
+     * @param sender The command sender to print the help to.
+     * @param command The command to print the permissions help for.
+     */
+    public static void printPermissions(CommandSender sender, CommandDescription command) {
+        // Get the permissions and make sure it isn't null
+        CommandPermissions permissions = command.getCommandPermissions();
+        if(permissions == null)
+            return;
+
+        // Make sure any permission node is set
+        if(permissions.getPermissionNodeCount() <= 0)
+            return;
+
+        // Print the header
+        sender.sendMessage(ChatColor.GOLD + "Permissions:");
+
+        // Print each node
+        for(String node : permissions.getPermissionNodes()) {
+            boolean nodePermission = true;
+            if(sender instanceof Player)
+                nodePermission = AuthMe.getInstance().authmePermissible((Player) sender, node);
+            final String nodePermsString = ChatColor.GRAY + (nodePermission ? ChatColor.ITALIC + " (Permission!)" : ChatColor.ITALIC + " (No Permission!)");
+            sender.sendMessage(" " + ChatColor.YELLOW + ChatColor.ITALIC + node + nodePermsString);
+        }
+
+        // Print the default permission
+        switch(permissions.getDefaultPermission()) {
+        case ALLOWED:
+            sender.sendMessage(ChatColor.GOLD + " Default: " + ChatColor.GRAY + ChatColor.ITALIC + "Permission!");
+            break;
+
+        case OP_ONLY:
+            final String defaultPermsString = ChatColor.GRAY + (permissions.getDefaultPermissionCommandSender(sender) ? ChatColor.ITALIC + " (Permission!)" : ChatColor.ITALIC + " (No Permission!)");
+            sender.sendMessage(ChatColor.GOLD + " Default: " + ChatColor.YELLOW + ChatColor.ITALIC + "OP's Only!" + defaultPermsString);
+            break;
+
+        case NOT_ALLOWED:
+        default:
+            sender.sendMessage(ChatColor.GOLD + " Default: " + ChatColor.GRAY + ChatColor.ITALIC + "No Permission!");
+            break;
+        }
+
+        // Print the permission result
+        if(permissions.hasPermission(sender))
+            sender.sendMessage(ChatColor.GOLD + " Result: " + ChatColor.GREEN + ChatColor.ITALIC + "Permission!");
+        else
+            sender.sendMessage(ChatColor.GOLD + " Result: " + ChatColor.DARK_RED + ChatColor.ITALIC + "No Permission!");
+    }
+
+    /**
+     * Print the command help alternatives information if available.
+     *
+     * @param sender The command sender to print the help to.
+     * @param command The command used.
+     * @param commandReference The original command reference used for this command.
+     */
+    public static void printAlternatives(CommandSender sender, CommandDescription command, CommandParts commandReference) {
+        // Make sure there are any alternatives
+        if(command.getLabels().size() <= 1)
+            return;
+
+        // Print the header
+        sender.sendMessage(ChatColor.GOLD + "Alternatives:");
+
+        // Get the label used
+        final String usedLabel = commandReference.get(command.getParentCount());
+
+        // Create a list of alternatives
+        List<String> alternatives = new ArrayList<>();
+        for(String entry : command.getLabels()) {
+            // Exclude the proper argument
+            if(entry.equalsIgnoreCase(usedLabel))
+                continue;
+            alternatives.add(entry);
+        }
+
+        // Sort the alternatives
+        Collections.sort(alternatives, new Comparator<String>() {
+            @Override
+            public int compare(String o1, String o2) {
+                return Double.compare(StringUtils.getDifference(usedLabel, o1), StringUtils.getDifference(usedLabel, o2));
+            }
+        });
+
+        // Print each alternative with proper syntax
+        for(String alternative : alternatives)
+            sender.sendMessage(" " + HelpSyntaxHelper.getCommandSyntax(command, commandReference, alternative, true));
+    }
+
+    /**
+     * Print the command help child's information if available.
+     *
+     * @param sender The command sender to print the help to.
+     * @param command The command to print the help for.
+     * @param commandReference The original command reference used for this command.
+     */
+    public static void printChildren(CommandSender sender, CommandDescription command, CommandParts commandReference) {
+        // Make sure there are child's
+        if(command.getChildren().size() <= 0)
+            return;
+
+        // Print the header
+        sender.sendMessage(ChatColor.GOLD + "Commands:");
+
+        // Loop through each child
+        for(CommandDescription child : command.getChildren())
+            sender.sendMessage(" " + HelpSyntaxHelper.getCommandSyntax(child, commandReference, null, false) + ChatColor.GRAY + ChatColor.ITALIC + " : " + child.getDescription());
+    }
+}

src/main/java/fr/xephi/authme/command/help/HelpProvider.java

@@ -0,0 +1,114 @@
+package fr.xephi.authme.command.help;
+
+import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.command.*;
+import org.bukkit.ChatColor;
+import org.bukkit.command.CommandSender;
+
+public class HelpProvider {
+
+    /**
+     * Show help for a specific command.
+     *
+     * @param sender The command sender the help needs to be shown to.
+     * @param reference The command reference to the help command.
+     * @param helpQuery The query to show help for.
+     */
+    public static void showHelp(CommandSender sender, CommandParts reference, CommandParts helpQuery) {
+        showHelp(sender, reference, helpQuery, true, true, true, true, true, true);
+    }
+
+    /**
+     * Show help for a specific command.
+     *
+     * @param sender The command sender the help needs to be shown to.
+     * @param reference The command reference to the help command.
+     * @param helpQuery The query to show help for.
+     * @param showCommand True to show the command.
+     * @param showDescription True to show the command description, both the short and detailed description.
+     * @param showArguments True to show the command argument help.
+     * @param showPermissions True to show the command permission help.
+     * @param showAlternatives True to show the command alternatives.
+     * @param showCommands True to show the child commands.
+     */
+    public static void showHelp(CommandSender sender, CommandParts reference, CommandParts helpQuery, boolean showCommand, boolean showDescription, boolean showArguments, boolean showPermissions, boolean showAlternatives, boolean showCommands) {
+        // Find the command for this help query, one with and one without a prefixed base command
+        FoundCommandResult result = AuthMe.getInstance().getCommandHandler().getCommandManager().findCommand(new CommandParts(helpQuery.getList()));
+        CommandParts commandReferenceOther = new CommandParts(reference.get(0), helpQuery.getList());
+        FoundCommandResult resultOther = AuthMe.getInstance().getCommandHandler().getCommandManager().findCommand(commandReferenceOther);
+        if(resultOther != null) {
+            if(result == null)
+                result = resultOther;
+
+            else if(result.getDifference() > resultOther.getDifference())
+                result = resultOther;
+        }
+
+        // Make sure a result was found
+        if(result == null) {
+            // Show a warning message
+            sender.sendMessage(ChatColor.DARK_RED + "" + ChatColor.ITALIC + helpQuery);
+            sender.sendMessage(ChatColor.DARK_RED + "Couldn't show any help information for this help query.");
+            return;
+        }
+
+        // Get the command description, and make sure it's valid
+        CommandDescription command = result.getCommandDescription();
+        if(command == null) {
+            // Show a warning message
+            sender.sendMessage(ChatColor.DARK_RED + "Failed to retrieve any help information!");
+            return;
+        }
+
+        // Get the proper command reference to use for the help page
+        CommandParts commandReference = command.getCommandReference(result.getQueryReference());
+
+        // Get the base command
+        String baseCommand = commandReference.get(0);
+
+        // Make sure the difference between the command reference and the actual command isn't too big
+        final double commandDifference = result.getDifference();
+        if(commandDifference > 0.20) {
+            // Show the unknown command warning
+            sender.sendMessage(ChatColor.DARK_RED + "No help found for '" + helpQuery + "'!");
+
+            // Get the suggested command
+            CommandParts suggestedCommandParts = new CommandParts(result.getCommandDescription().getCommandReference(commandReference).getRange(1));
+
+            // Show a command suggestion if available and the difference isn't too big
+            if(commandDifference < 0.75)
+                if(result.getCommandDescription() != null)
+                    sender.sendMessage(ChatColor.YELLOW + "Did you mean " + ChatColor.GOLD + "/" + baseCommand + " help " + suggestedCommandParts + ChatColor.YELLOW + "?");
+
+            // Show the help command
+            sender.sendMessage(ChatColor.YELLOW + "Use the command " + ChatColor.GOLD + "/" + baseCommand + " help" + ChatColor.YELLOW + " to view help.");
+            return;
+        }
+
+        // Show a message when the command handler is assuming a command
+        if(commandDifference > 0) {
+            // Get the suggested command
+            CommandParts suggestedCommandParts = new CommandParts(result.getCommandDescription().getCommandReference(commandReference).getRange(1));
+
+            // Show the suggested command
+            sender.sendMessage(ChatColor.DARK_RED + "No help found, assuming '" + ChatColor.GOLD + suggestedCommandParts + ChatColor.DARK_RED + "'!");
+        }
+
+        // Print the help header
+        sender.sendMessage(ChatColor.GOLD + "==========[ " + AuthMe.PLUGIN_NAME.toUpperCase() + " HELP ]==========");
+
+        // Print the command help information
+        if(showCommand)
+            HelpPrinter.printCommand(sender, command, commandReference);
+        if(showDescription)
+            HelpPrinter.printCommandDescription(sender, command);
+        if(showArguments)
+            HelpPrinter.printArguments(sender, command);
+        if(showPermissions)
+            HelpPrinter.printPermissions(sender, command);
+        if(showAlternatives)
+            HelpPrinter.printAlternatives(sender, command, commandReference);
+        if(showCommands)
+            HelpPrinter.printChildren(sender, command, commandReference);
+    }
+}

src/main/java/fr/xephi/authme/command/help/HelpSyntaxHelper.java

@@ -0,0 +1,60 @@
+package fr.xephi.authme.command.help;
+
+import fr.xephi.authme.command.CommandArgumentDescription;
+import fr.xephi.authme.command.CommandDescription;
+import fr.xephi.authme.command.CommandParts;
+import fr.xephi.authme.util.ListUtils;
+import org.bukkit.ChatColor;
+
+public class HelpSyntaxHelper {
+
+    /**
+     * Get the proper syntax for a command.
+     *
+     * @param commandDescription The command to get the syntax for.
+     * @param commandReference The reference of the command.
+     * @param alternativeLabel The alternative label to use for this command syntax.
+     * @param highlight True to highlight the important parts of this command.
+     *
+     * @return The command with proper syntax.
+     */
+    @SuppressWarnings("StringConcatenationInsideStringBufferAppend")
+    public static String getCommandSyntax(CommandDescription commandDescription, CommandParts commandReference, String alternativeLabel, boolean highlight) {
+        // Create a string builder to build the command
+        StringBuilder sb = new StringBuilder();
+
+        // Set the color and prefix a slash
+        sb.append(ChatColor.WHITE + "/");
+
+        // Get the help command reference, and the command label
+        CommandParts helpCommandReference = commandDescription.getCommandReference(commandReference);
+        final String parentCommand = (new CommandParts(helpCommandReference.getRange(0, helpCommandReference.getCount() - 1))).toString();
+        String commandLabel = helpCommandReference.get(helpCommandReference.getCount() - 1);
+
+        // Check whether the alternative label should be used
+        if(alternativeLabel != null)
+            if(alternativeLabel.trim().length() > 0)
+                commandLabel = alternativeLabel;
+
+        // Show the important bit of the command, highlight this part if required
+        sb.append(ListUtils.implode(parentCommand, (highlight ? ChatColor.YELLOW + "" + ChatColor.BOLD : "") + commandLabel, " "));
+        if(highlight)
+            sb.append(ChatColor.YELLOW);
+
+        // Add each command arguments
+        for(CommandArgumentDescription arg : commandDescription.getArguments()) {
+            // Add the argument as optional or non-optional argument
+            if(!arg.isOptional())
+                sb.append(ChatColor.ITALIC + " <" + arg.getLabel() + ">");
+            else
+                sb.append(ChatColor.ITALIC + " [" + arg.getLabel() + "]");
+        }
+
+        // Add some dots if the command allows unlimited arguments
+        if(commandDescription.getMaximumArguments() < 0)
+            sb.append(ChatColor.ITALIC + " ...");
+
+        // Return the build command syntax
+        return sb.toString();
+    }
+}

src/main/java/fr/xephi/authme/util/ListUtils.java

@@ -0,0 +1,75 @@
+package fr.xephi.authme.util;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ListUtils {
+
+    /**
+     * Implode a list of elements into a single string, with a specified separator.
+     *
+     * @param elements The elements to implode.
+     * @param separator The separator to use.
+     *
+     * @return The result string.
+     */
+    public static String implode(List<String> elements, String separator) {
+        // Create a string builder
+        StringBuilder sb = new StringBuilder();
+
+        // Append each element
+        for(String element : elements) {
+            // Make sure the element isn't empty
+            if(element.trim().length() == 0)
+                continue;
+
+            // Prefix the separator if it isn't the first element
+            if(sb.length() > 0)
+                sb.append(separator);
+
+            // Append the element
+            sb.append(element);
+        }
+
+        // Return the result
+        return sb.toString();
+    }
+
+    /**
+     * Implode two lists of elements into a single string, with a specified separator.
+     *
+     * @param elements The first list of elements to implode.
+     * @param otherElements The second list of elements to implode.
+     * @param separator The separator to use.
+     *
+     * @return The result string.
+     */
+    public static String implode(List<String> elements, List<String> otherElements, String separator) {
+        // Combine the lists
+        List<String> combined = new ArrayList<>();
+        combined.addAll(elements);
+        combined.addAll(otherElements);
+
+        // Implode and return the result
+        return implode(combined, separator);
+    }
+
+    /**
+     * Implode two elements into a single string, with a specified separator.
+     *
+     * @param element The first element to implode.
+     * @param otherElement The second element to implode.
+     * @param separator The separator to use.
+     *
+     * @return The result string.
+     */
+    public static String implode(String element, String otherElement, String separator) {
+        // Combine the lists
+        List<String> combined = new ArrayList<>();
+        combined.add(element);
+        combined.add(otherElement);
+
+        // Implode and return the result
+        return implode(combined, separator);
+    }
+}

src/main/java/fr/xephi/authme/util/Profiler.java

@@ -0,0 +1,132 @@
+package fr.xephi.authme.util;
+
+import java.text.DecimalFormat;
+
+@SuppressWarnings("UnusedDeclaration")
+public class Profiler {
+
+    /** Defines the past time in milliseconds. */
+    private long time = 0;
+    /** Defines the time in milliseconds the profiler last started at. */
+    private long start = -1;
+
+    /**
+     * Constructor. This won't start the profiler immediately.
+     */
+    public Profiler() {
+        this(false);
+    }
+
+    /**
+     * Constructor.
+     *
+     * @param start True to immediately start the profiler.
+     */
+    public Profiler(boolean start) {
+        // Should the timer be started
+        if(start)
+            start();
+    }
+
+    /**
+     * Start the profiler.
+     *
+     * @return True if the profiler was started, false otherwise possibly due to an error.
+     * True will also be returned if the profiler was started already.
+     */
+    public boolean start() {
+        // Make sure the timer isn't started already
+        if(isActive())
+            return true;
+
+        // Set the start time
+        this.start = System.currentTimeMillis();
+        return true;
+    }
+
+    /**
+     * This will start the profiler if it's not active, or will stop the profiler if it's currently active.
+     *
+     * @return True if the profiler has been started, false if the profiler has been stopped.
+     */
+    public boolean pause() {
+        // Toggle the profiler state
+        if(isStarted())
+            stop();
+        else
+            start();
+
+        // Return the result
+        return isStarted();
+    }
+
+    /**
+     * Stop the profiler if it's active.
+     *
+     * @return True will be returned if the profiler was stopped while it was active. False will be returned if the
+     * profiler was stopped already.
+     */
+    public boolean stop() {
+        // Make sure the profiler is active
+        if(!isActive())
+            return false;
+
+        // Stop the profiler, calculate the passed time
+        this.time += System.currentTimeMillis() - this.start;
+        this.start = -1;
+        return true;
+    }
+
+    /**
+     * Check whether the profiler has been started. The profiler doesn't need to be active right now.
+     *
+     * @return True if the profiler was started, false otherwise.
+     */
+    public boolean isStarted() {
+        return isActive() || this.time > 0;
+    }
+
+    /**
+     * Check whether the profiler is currently active.
+     *
+     * @return True if the profiler is active, false otherwise.
+     */
+    public boolean isActive() {
+        return this.start >= 0;
+    }
+
+    /**
+     * Get the passed time in milliseconds.
+     *
+     * @return The passed time in milliseconds.
+     */
+    public long getTime() {
+        // Check whether the profiler is currently active
+        if(isActive())
+            return this.time + (System.currentTimeMillis() - this.start);
+        return this.time;
+    }
+
+    /**
+     * Get the passed time in a formatted string.
+     *
+     * @return The passed time in a formatted string.
+     */
+    public String getTimeFormatted() {
+        // Get the passed time
+        long time = getTime();
+
+        // Return the time if it's less than one millisecond
+        if(time <= 0)
+            return "<1 ms";
+
+        // Return the time in milliseconds
+        if(time < 1000)
+            return time + " ms";
+
+        // Convert the time into seconds with a single decimal
+        double timeSeconds = ((double) time) / 1000;
+        DecimalFormat df = new DecimalFormat("#0.0");
+        return df.format(timeSeconds) + " s";
+    }
+}

src/main/java/fr/xephi/authme/util/StringUtils.java

@@ -0,0 +1,28 @@
+package fr.xephi.authme.util;
+
+import net.ricecode.similarity.LevenshteinDistanceStrategy;
+import net.ricecode.similarity.StringSimilarityService;
+import net.ricecode.similarity.StringSimilarityServiceImpl;
+
+public class StringUtils {
+
+    /**
+     * Get the difference of two strings.
+     *
+     * @param first First string.
+     * @param second Second string.
+     *
+     * @return The difference value.
+     */
+    public static double getDifference(String first, String second) {
+        // Make sure the strings are valid.
+        if(first == null || second == null)
+            return 1.0;
+
+        // Create a string similarity service instance, to allow comparison
+        StringSimilarityService service = new StringSimilarityServiceImpl(new LevenshteinDistanceStrategy());
+
+        // Determine the difference value, return the result
+        return Math.abs(service.score(first, second) - 1.0);
+    }
+}

src/main/resources/messages/messages_nl.yml

@@ -1,56 +1,56 @@
-unknown_user: Gebruiker is niet gevonden in database
-unsafe_spawn: De locatie waar je de vorige keer het spel verlied was gevaarlijk, je bent geteleporteert naar de Spawn
+unknown_user: Gebruiker is niet gevonden in de database
+unsafe_spawn: De locatie waar je de vorige keer het spel verliet was gevaarlijk, je bent geteleporteerd naar de spawn
 not_logged_in: '&cNiet ingelogt!'
 reg_voluntarily: Je kunt je gebruikersnaam registreren met "/register <wachtwoord> <herhaalWachtwoord>"
 usage_log: '&cGebruik: /login <wachtwoord>'
 wrong_pwd: '&cFout wachtwoord'
 unregistered: '&cRegistratie succesvol ongedaan gemaakt!'
 reg_disabled: '&cRegistratie is uitgeschakeld'
-valid_session: '&cSessie ingelogt'
-login: '&cSuccesvol ingelogt!'
-password_error_nick: '&fYou can''t use your name as password'
-password_error_unsafe: '&fYou can''t use unsafe passwords'
+valid_session: '&cSessie ingelogd'
+login: '&cSuccesvol ingelogd!'
+password_error_nick: '&fJe kunt je gebruikersnaam niet als wachtwoord gebruiken'
+password_error_unsafe: '&fJe kunt geen onveilige wachtwoorden gebruiken'
 vb_nonActiv: Je accound is nog niet geactiveerd, controleer je mailbox!
 user_regged: '&cGebruikersnaam is al geregistreerd'
 usage_reg: '&cGebruik: /register <wachtwoord> <herhaalWachtwoord>'
 max_reg: Je hebt de maximale registraties van jouw account overschreden.
 no_perm: '&cGeen toegang!'
-error: Error; neem contact op met een ADMIN!
+error: Error: neem contact op met een administrator!
 login_msg: '&cLog in met "/login <wachtwoord>"'
 reg_msg: '&cRegistreer met "/register <wachtwoord> <herhaalWachtwoord>"'
 usage_unreg: '&cGebruik: /unregister password'
 pwd_changed: '&cWachtwoord aangepast!'
 user_unknown: '&cGebruikersnaam niet geregistreerd'
 password_error: Wachtwoord incorrect!
-invalid_session: Sessie beschadigt, wacht tot de sessie is verlopen en join opnieuw.
+invalid_session: Sessie beschadigd, wacht tot de sessie is verlopen en verbindt opnieuw.
 reg_only: Alleen voor geregistreerde spelers! Bezoek http://example.com om te registreren
-logged_in: '&cJe bent al ingelogt!'
-logout: '&cJe bent succesvol uitgelogt'
+logged_in: '&cJe bent al ingelogd!'
+logout: '&cJe bent succesvol uitgelogd'
 same_nick: Er is al iemand met jou gebruikersnaam online.
 registered: '&cSuccesvol geregistreerd!'
 pass_len: Je gekozen wachtwoord voldoet niet aan de minimum of maximum lengte
 reload: Configuratie en database is opnieuw opgestard
-timeout: Login time-out; het duurde telang voor je je inlogde.
+timeout: Login time-out: het duurde telang voor je je inlogde.
 usage_changepassword: 'Gebruik: /changepassword <oudWachtwoord> <nieuwWachtwoord>'
-name_len: '&cJouw gebruikersnaam is te kort'
-regex: '&cJouw gebruikersnaam bestaat uit illegale tekens. tegestaan chars: REG_EX'
-add_email: '&cVoeg uw email toe Alstublieft met: /email add jouw wachtwoord herhaalwachtwoord'
-recovery_email: '&cWachtwoord vergeten? gebruik alstublieft  /email recovery <Jouwemail>'
-usage_captcha: '&cGebruik: /captcha <deCaptcha>'
-wrong_captcha: '&cverkeerde Captcha, Gebruik alstublieft : /captcha THE_CAPTCHA'
-valid_captcha: '&cJouw captcha is geldig!'
-kick_forvip: '&cA VIP Gebruiker ga naar de volledige server!'
-kick_fullserver: '&cDe server is eigenlijk vol, Sorry!'
-usage_email_add: '&fGebruik: /email add <email> <herhaalEmail> '
-usage_email_change: '&fGebruik: /email change <oudeEmail> <nieuweEmail> '
-usage_email_recovery: '&fGebruik: /email recovery <Email>'
-new_email_invalid: '[AuthMe] Nieuw email ongeldig!'
-old_email_invalid: '[AuthMe] Oud email ongeldig!'
-email_invalid: '[AuthMe] ongeldig Email'
-email_added: '[AuthMe] Bevestig jouw Email !'
-email_confirm: '[AuthMe] Bevestig jouw Email !'
-email_changed: '[AuthMe] Email Veranderd !'
-email_send: '[AuthMe] Herstel Email Verzonden !'
-country_banned: 'Your country is banned from this server'
-antibot_auto_enabled: '[AuthMe] AntiBotMod automatically enabled due to massive connections!'
-antibot_auto_disabled: '[AuthMe] AntiBotMod automatically disabled after %m Minutes, hope invasion stopped'
+name_len: '&cJe gebruikersnaam is te kort'
+regex: '&cJouw gebruikersnaam bevat illegale tekens. Toegestaane karakters: REG_EX'
+add_email: '&cVoeg uw E-mail alstublieft toe met: /email add <E-mail> <wachtwoord> <herhaalWachtwoord>'
+recovery_email: '&cWachtwoord vergeten? Gebruik alstublieft "/email recovery <E-mail>"'
+usage_captcha: '&cGebruik: /captcha <captcha>'
+wrong_captcha: '&cVerkeerde Captcha, gebruik alstublieft: /captcha THE_CAPTCHA'
+valid_captcha: '&cDe captcha is geldig!'
+kick_forvip: '&cEen VIP Gebruiker ga naar de volledige server!'
+kick_fullserver: '&cDe server is vol, sorry!'
+usage_email_add: '&fGebruik: /email add <E-mail> <herhaalE-mail>'
+usage_email_change: '&fGebruik: /email change <oudeE-mail> <nieuweE-mail>'
+usage_email_recovery: '&fGebruik: /email recovery <E-mail>'
+new_email_invalid: '[AuthMe] Nieuwe E-mail ongeldig!'
+old_email_invalid: '[AuthMe] Oude E-mail ongeldig!'
+email_invalid: '[AuthMe] Ongeldige E-mail'
+email_added: '[AuthMe] Bevestig jouw E-mail!'
+email_confirm: '[AuthMe] Bevestig jouw E-mail!'
+email_changed: '[AuthMe] Email Veranderd!'
+email_send: '[AuthMe] Herstel E-mail Verzonden!'
+country_banned: 'Jouw land is geband op deze server'
+antibot_auto_enabled: '[AuthMe] AntiBotMod automatisch aangezet vanewge veel verbindingen!'
+antibot_auto_disabled: '[AuthMe] AntiBotMod automatisch uitgezet na %m minuten, hopelijk is de invasie gestopt'