Implemented the forcelogin command

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

@@ -236,7 +236,20 @@ public class CommandManager {
                 "Get the IP address of the specified online player.",
                 authMeCommand);
         getIpCommand.setCommandPermissions("authme.admin.getip", CommandPermissions.DefaultPermission.OP_ONLY);
-        getIpCommand.addArgument(new CommandArgumentDescription("player", "Online player name", false));
+        getIpCommand.addArgument(new CommandArgumentDescription("player", "Online player name", true));
+
+        // Register the forcelogin command
+        CommandDescription forceLoginCommand = new CommandDescription(
+                new ForceLoginCommand(),
+                new ArrayList<String>() {{
+                    add("forcelogin");
+                    add("login");
+                }},
+                "Force login player",
+                "Force the specified player to login.",
+                authMeCommand);
+        forceLoginCommand.setCommandPermissions("authme.admin.forcelogin", CommandPermissions.DefaultPermission.OP_ONLY);
+        forceLoginCommand.addArgument(new CommandArgumentDescription("player", "Online player name", true));
 
         // Register the spawn command
         CommandDescription spawnCommand = new CommandDescription(

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;
+    }
+}