#1119 email show permission and privacy improvements (#1312)

* #1119 new permission and email hider

* Updated commands.md

* Improved email hiding method

* Revert "Improved email hiding method"

This reverts commit cb60d7b

* New config option, updated tests, config.md and permission_nodes.md

* Moved to service import, fixed typo and updated config.md

* Removed unused imports O.o

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

@@ -456,6 +456,7 @@ public class CommandInitializer {
             .labels("show", "myemail")
             .description("Show Email")
             .detailedDescription("Show your current email address.")
+            .permission(PlayerPermission.SEE_EMAIL)
             .executableCommand(ShowEmailCommand.class)
             .register();
 

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

@@ -5,6 +5,7 @@ import fr.xephi.authme.data.auth.PlayerAuth;
 import fr.xephi.authme.data.auth.PlayerCache;
 import fr.xephi.authme.message.MessageKey;
 import fr.xephi.authme.service.CommonService;
+import fr.xephi.authme.settings.properties.SecuritySettings;
 import fr.xephi.authme.util.Utils;
 import org.bukkit.entity.Player;
 
@@ -26,9 +27,22 @@ public class ShowEmailCommand extends PlayerCommand {
     public void runCommand(Player player, List<String> arguments) {
         PlayerAuth auth = playerCache.getAuth(player.getName());
         if (auth != null && !Utils.isEmailEmpty(auth.getEmail())) {
-            commonService.send(player, MessageKey.EMAIL_SHOW, auth.getEmail());
+            if(commonService.getProperty(SecuritySettings.USE_EMAIL_MASKING)){
+                commonService.send(player, MessageKey.EMAIL_SHOW, emailMask(auth.getEmail()));
+            } else {
+                commonService.send(player, MessageKey.EMAIL_SHOW, auth.getEmail());
+            }
         } else {
             commonService.send(player, MessageKey.SHOW_NO_EMAIL);
         }
     }
+
+    private String emailMask(String email){
+        String[] frag = email.split("@");   //Split id and domain
+        int sid = frag[0].length() / 3 + 1;     //Define the id view (required length >= 1)
+        int sdomain = frag[1].length() / 3;   //Define the domain view (required length >= 0)
+        String id = frag[0].substring(0, sid) + "***";  //Build the id
+        String domain = "***" + frag[1].substring(sdomain);  //Build the domain
+        return id + "@" + domain;
+    }
 }