Implemented the purge command

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

@@ -123,6 +123,19 @@ public class CommandManager {
                 dungeonMazeCommand);
         listWorldCommand.setCommandPermissions("dungeonmaze.command.listworlds", CommandPermissions.DefaultPermission.OP_ONLY);*/
 
+        // Register the purge command
+        CommandDescription purgeCommand = new CommandDescription(
+                new ReloadCommand(),
+                new ArrayList<String>() {{
+                    add("purge");
+                    add("delete");
+                }},
+                "Purge AuthMeReloaded data",
+                "Purge old AuthMeReloaded data longer than the specified amount of days ago.",
+                authMeCommand);
+        purgeCommand.setCommandPermissions("authme.admin.purge", CommandPermissions.DefaultPermission.OP_ONLY);
+        purgeCommand.addArgument(new CommandArgumentDescription("days", "Number of days", false));
+
         // Register the reload command
         CommandDescription reloadCommand = new CommandDescription(
                 new ReloadCommand(),

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

@@ -0,0 +1,72 @@
+package fr.xephi.authme.command.executable;
+
+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;
+    }
+}