init commit

.gitignore

@@ -0,0 +1,5 @@
+build
+.gradle
+.idea
+gradle/wrapper
+.DS_Store

build.gradle.kts

@@ -0,0 +1,32 @@
+plugins {
+    id("java")
+    kotlin("jvm")
+}
+
+group = "org.example"
+version = "1.0-SNAPSHOT"
+
+repositories {
+    mavenCentral()
+    maven {
+        name = "papermc"
+        url = uri("https://repo.papermc.io/repository/maven-public/")
+    }
+}
+
+dependencies {
+    testImplementation(platform("org.junit:junit-bom:5.10.0"))
+    testImplementation("org.junit.jupiter:junit-jupiter")
+    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+    compileOnly("io.papermc.paper:paper-api:1.21.8-R0.1-SNAPSHOT")
+    implementation(kotlin("stdlib-jdk8"))
+    implementation("org.xerial:sqlite-jdbc:3.50.3.0")
+}
+
+java {
+    toolchain.languageVersion.set(JavaLanguageVersion.of(21))
+}
+
+tasks.test {
+    useJUnitPlatform()
+}

gradlew

@@ -0,0 +1,234 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle.kts

@@ -0,0 +1,9 @@
+pluginManagement {
+    plugins {
+        kotlin("jvm") version "2.2.0"
+    }
+}
+plugins {
+    id("org.gradle.toolchains.foojay-resolver-convention") version "0.8.0"
+}
+rootProject.name = "fetmcplugin"

src/main/java/de/sebastianvonhelmersen/AuthInfos.java

@@ -0,0 +1,32 @@
+package de.sebastianvonhelmersen;
+
+import java.util.UUID;
+
+public class AuthInfos {
+    private UUID uuid;
+    private AuthState state;
+    private String username = null;
+    private Database db;
+
+    public AuthInfos(Database db, UUID uuid) {
+        this.uuid = uuid;
+        assert db != null;
+        this.db = db;
+        this.state = checkState();
+    }
+
+    /**
+     * Checks the authstate in the Database
+     * @return The determined AuthState
+     */
+    private AuthState checkState() {
+        return db.isAuthenticated(this.uuid.toString()) ? AuthState.AUTHENTICATED : AuthState.AUTH_WAITING_USERNAME;
+    }
+    public void setUsername(String username) {
+        this.username = username;
+        this.state = AuthState.AUTH_WAITING_PASSWORD;
+    }
+    public AuthState getState() { return this.state; }
+    public String getUsername() { return this.username; }
+    public void reset() { this.state = AuthState.AUTH_WAITING_USERNAME; }
+}

src/main/java/de/sebastianvonhelmersen/AuthState.java

@@ -0,0 +1,8 @@
+package de.sebastianvonhelmersen;
+
+public enum AuthState {
+    AUTHENTICATED,
+    AUTH_FAILED,
+    AUTH_WAITING_USERNAME,
+    AUTH_WAITING_PASSWORD
+}

src/main/java/de/sebastianvonhelmersen/Database.java

@@ -0,0 +1,64 @@
+package de.sebastianvonhelmersen;
+
+import java.io.File;
+import java.sql.*;
+
+public class Database {
+    private Statement statement;
+    public Database(File dbFile) {
+        try
+        {
+            String path = "jdbc:sqlite:" + dbFile.getAbsolutePath();
+            // create a database connection
+            Connection connection = DriverManager.getConnection(path);
+            Statement statement = connection.createStatement();
+            this.statement = statement;
+
+            statement.setQueryTimeout(30);  // set timeout to 30 sec.
+
+            statement.executeUpdate(
+                    "CREATE TABLE IF NOT EXISTS players (" +
+                            "uuid VARCHAR(36) PRIMARY KEY, " +
+                            "uid VARCHAR(50), " +
+                            "mcusername VARCHAR(50), " +
+                            "ladp_username VARCHAR(50), " +
+                            "firstName VARCHAR(50), " +
+                            "lastName VARCHAR(50)," +
+                            "mail VARCHAR(320))"
+            );
+        }
+        catch(SQLException e)
+        {
+            // if the error message is "out of memory",
+            // it probably means no database file is found
+            e.printStackTrace(System.err);
+        }
+    }
+
+    public boolean isAuthenticated(String uuid) {
+        String query = "select * from players where uuid = ?";
+        try(PreparedStatement prep_query = this.statement.getConnection().prepareStatement(query)){
+            prep_query.setString(1, uuid);
+            ResultSet rs = prep_query.executeQuery();
+            return rs.next();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public void addPlayer(String uuid, String mcusername, LdapUser user) {
+        String query = "insert into players values (?, ?, ?, ?, ?, ?, ?)";
+        try(PreparedStatement prep_query = this.statement.getConnection().prepareStatement(query)){
+            prep_query.setString(1, uuid);
+            prep_query.setString(2, String.valueOf(user.uid));
+            prep_query.setString(3, mcusername);
+            prep_query.setString(4, user.ldapName);
+            prep_query.setString(5, user.firstName);
+            prep_query.setString(6, user.lastName);
+            prep_query.setString(7, user.email);
+            prep_query.executeUpdate();
+        } catch ( SQLException e ) {
+            throw new RuntimeException(e);
+        }
+    }
+}

src/main/java/de/sebastianvonhelmersen/Ldap.java

@@ -0,0 +1,102 @@
+package de.sebastianvonhelmersen;
+
+import javax.naming.Context;
+import javax.naming.NamingEnumeration;
+import javax.naming.directory.*;
+import java.util.Hashtable;
+
+public class Ldap {
+
+    /*
+    private static final String LDAP_URL = "ldap://192.168.1.11:389";
+    private static final String BASE_DN = "dc=authentik,dc=vonhelmersen,dc=online";
+    private static final String ADMIN_DN = "cn=akadmin,ou=users,dc=authentik,dc=vonhelmersen,dc=online"; // service account
+    private static final String ADMIN_PASSWORD = "cuwgoH-9biqto-xiddin";
+    */
+
+    private static final String LDAP_URL = "ldap://juri:389";
+    private static final String BASE_DN = "dc=fet,dc=htu,dc=tuwien,dc=ac,dc=at";
+    private static final String ADMIN_DN = "cn=admin,dc=fet,dc=htu,dc=tuwien,dc=ac,dc=at"; // service account
+    public static LdapUser authenticate(String username, String password) {
+
+        try {
+            // 1. Bind as admin/service account
+            Hashtable<String, String> env = new Hashtable<>();
+            env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
+            env.put(Context.PROVIDER_URL, LDAP_URL);
+            env.put(Context.SECURITY_AUTHENTICATION, "simple");
+            env.put(Context.SECURITY_PRINCIPAL, ADMIN_DN);
+            env.put(Context.SECURITY_CREDENTIALS, ADMIN_PASSWORD);
+
+            DirContext ctx = new InitialDirContext(env);
+
+            // 2. Search for user DN
+            String filter = "(uid=" + escapeLDAPSearchFilter(username) + ")";
+            SearchControls controls = new SearchControls();
+            controls.setSearchScope(SearchControls.SUBTREE_SCOPE);
+            NamingEnumeration<SearchResult> results = ctx.search(BASE_DN, filter, controls);
+
+            if (!results.hasMore()) {
+                ctx.close();
+                return null; // user not found
+            }
+
+            /*
+            {
+                givenname=givenName: Sebastian,
+                sn=sn: Helmersen,
+                userpassword=userPassword: [B@2b6cb5b5,
+                loginshell=loginShell: /bin/bash,
+                gidnumber=gidNumber: 2000,
+                uidnumber=uidNumber: 1196,
+                mail=mail: helmi@fet.at,
+                objectclass=objectClass: posixAccount,
+                inetOrgPerson,
+                organizationalPerson,
+                person,
+                uid=uid: helmi,
+                cn=cn: Sebastian Helmersen,
+                homedirectory=homeDirectory: /home/helmi
+            }
+             */
+            // System.out.println("Results: " + results.toString());
+
+
+            SearchResult result = results.next();
+            String userDN = result.getNameInNamespace();
+            ctx.close();
+
+            // 3. Try binding with userDN + password
+            Hashtable<String, String> authEnv = new Hashtable<>();
+            authEnv.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
+            authEnv.put(Context.PROVIDER_URL, LDAP_URL);
+            authEnv.put(Context.SECURITY_AUTHENTICATION, "simple");
+            authEnv.put(Context.SECURITY_PRINCIPAL, userDN);
+            authEnv.put(Context.SECURITY_CREDENTIALS, password);
+
+            new InitialDirContext(authEnv).close(); // bind attempt
+
+            return new LdapUser(result.getAttributes()); // success
+
+        } catch (Exception e) {
+            e.printStackTrace();
+            return null; // failed (invalid credentials or LDAP error)
+        }
+    }
+
+    public static String escapeLDAPSearchFilter(String input) {
+        StringBuilder sb = new StringBuilder();
+        for (int i = 0; i < input.length(); i++) {
+            char c = input.charAt(i);
+            switch (c) {
+                case '\\': sb.append("\\5c"); break;
+                case '*': sb.append("\\2a"); break;
+                case '(': sb.append("\\28"); break;
+                case ')': sb.append("\\29"); break;
+                case '\u0000': sb.append("\\00"); break;
+                default: sb.append(c);
+            }
+        }
+        return sb.toString();
+    }
+}

src/main/java/de/sebastianvonhelmersen/LdapUser.java

@@ -0,0 +1,32 @@
+package de.sebastianvonhelmersen;
+
+import javax.naming.directory.Attribute;
+import javax.naming.directory.Attributes;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class LdapUser {
+    public String firstName;
+    public String lastName;
+    public String email;
+    public int uid;
+    public int gid;
+    public String ldapName;
+
+    public LdapUser(Attributes attributes) {
+        firstName = trimAttribute(attributes.get("givenname"));
+        lastName = trimAttribute(attributes.get("sn"));
+        email = trimAttribute(attributes.get("mail"));
+        uid = Integer.parseInt(trimAttribute(attributes.get("uidnumber")));
+        gid = Integer.parseInt(trimAttribute(attributes.get("gidnumber")));
+        ldapName = trimAttribute(attributes.get("uid"));
+    }
+
+    private String trimAttribute(Attribute raw) {
+        Pattern pattern = Pattern.compile("^[^:]+:\\s*(.+)$");
+        Matcher matcher = pattern.matcher(raw.toString());
+        if (!matcher.find()) return "";
+
+        return matcher.group(1).trim();
+    }
+}

src/main/java/de/sebastianvonhelmersen/fetmcplugin.java

@@ -0,0 +1,187 @@
+package de.sebastianvonhelmersen;
+
+import net.kyori.adventure.text.Component;
+import org.bukkit.Bukkit;
+import org.bukkit.GameMode;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.block.BlockPlaceEvent;
+import org.bukkit.event.entity.EntityDamageEvent;
+import org.bukkit.event.entity.EntityTargetLivingEntityEvent;
+import org.bukkit.event.player.AsyncPlayerChatEvent;
+import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.event.player.PlayerMoveEvent;
+import org.bukkit.plugin.java.JavaPlugin;
+
+import java.io.File;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+import java.util.logging.Level;
+
+public class fetmcplugin extends JavaPlugin implements Listener {
+    private Database db;
+    private Map<UUID, AuthInfos> allInfos = HashMap.newHashMap(0);
+
+    @Override
+    public void onEnable() {
+        // Make sure the plugin's data folder exists
+        File dataFolder = this.getDataFolder();
+
+        if (!dataFolder.exists()) {
+            dataFolder.mkdirs();
+        }
+
+        // Define the actual SQLite database file
+        File dbFile = new File(dataFolder, "auth.db");
+
+        Bukkit.getPluginManager().registerEvents(this, this);
+        this.db = new Database(dbFile);
+    }
+
+    @EventHandler
+    public void onPlayerJoin(PlayerJoinEvent event) {
+        UUID uuid = event.getPlayer().getUniqueId();
+        AuthInfos authInfos = new AuthInfos(db, uuid);
+        getLogger().log(Level.INFO,"Detected new Player with Auth State " + authInfos.getState().toString());
+
+        if( authInfos.getState() == AuthState.AUTHENTICATED ) {
+            return;
+        }
+
+        allInfos.put(uuid, authInfos);
+        String greeting = "Hallo, " + event.getPlayer().getName() +"! Willkommen auf dem MC Server der FET!\nBitte registriere dich mit deinen Anmeldedaten um zu beginnen!";
+        // Set timings: fadeIn = 0, stay = very long, fadeOut = 0
+        event.getPlayer().sendTitlePart(net.kyori.adventure.title.TitlePart.TIMES,
+                net.kyori.adventure.title.Title.Times.times(
+                        java.time.Duration.ZERO,
+                        java.time.Duration.ofSeconds(9999), // basically "forever"
+                        java.time.Duration.ZERO
+                )
+        );
+
+        // Send the title text
+        event.getPlayer().sendTitlePart(net.kyori.adventure.title.TitlePart.TITLE,
+                Component.text("§cBenutzername"));
+
+        // Send the subtitle text
+        event.getPlayer().sendTitlePart(net.kyori.adventure.title.TitlePart.SUBTITLE,
+                Component.text("§eBitte gib den Benutzernamen deines FET Accounts ein!"));
+
+        event.getPlayer().sendMessage(greeting);
+        event.getPlayer().setGameMode(GameMode.ADVENTURE);
+
+    }
+
+    @EventHandler
+    public void onPlayerMove(PlayerMoveEvent event) {
+        UUID uuid = event.getPlayer().getUniqueId();
+        event.getPlayer().setAllowFlight(true);
+
+        if ( allInfos.containsKey(uuid) ) {
+            event.setCancelled(true);
+            return;
+        }
+    }
+
+    @EventHandler
+    public void onPlayerDamage(EntityDamageEvent event) {
+        if ( event.getEntity() instanceof Player) {
+            UUID uuid = event.getEntity().getUniqueId();
+            if ( allInfos.containsKey(uuid) ) {
+                event.setCancelled(true);
+                return;
+            }
+        }
+    }
+
+    @EventHandler
+    public void onBlockPlace(BlockPlaceEvent event) {
+        UUID uuid = event.getPlayer().getUniqueId();
+        if ( allInfos.containsKey(uuid) ) {
+            event.setCancelled(true);
+            return;
+        }
+    }
+
+    @EventHandler
+    public void onEntityTarget(EntityTargetLivingEntityEvent event) {
+        if (event.getTarget() instanceof Player) {
+            UUID uuid = event.getTarget().getUniqueId();
+            if ( allInfos.containsKey(uuid) ) {
+                event.setCancelled(true);
+                return;
+            }
+        }
+    }
+
+    @EventHandler
+    public void onChat(AsyncPlayerChatEvent event) {
+        UUID uuid = event.getPlayer().getUniqueId();
+
+        if (!allInfos.containsKey(uuid)) {
+            return;
+        }
+
+        AuthInfos info = allInfos.get(uuid);
+        String message = event.getMessage();
+
+        switch ( info.getState() ) {
+            case AUTHENTICATED, AUTH_FAILED:
+                break;
+            case AUTH_WAITING_USERNAME:
+                getLogger().log(Level.INFO, "Auth Waiting for Player " + event.getPlayer().getName());
+                allInfos.get(uuid).setUsername(message.trim());
+                getLogger().log(Level.INFO, "Got Username '" + message.trim() + "'");
+                event.setCancelled(true);
+                event.getRecipients().clear();
+                // Send the title text
+                event.getPlayer().sendTitlePart(net.kyori.adventure.title.TitlePart.TITLE,
+                        Component.text("§cPasswort"));
+
+                // Send the subtitle text
+                event.getPlayer().sendTitlePart(net.kyori.adventure.title.TitlePart.SUBTITLE,
+                        Component.text("§eBitte gib das Password deines FET Accounts ein!"));
+                break;
+            case AUTH_WAITING_PASSWORD:
+                LdapUser user = checkLdap(info.getUsername(), message.trim());
+                event.setCancelled(true);
+                event.getRecipients().clear();
+                if(user != null) {
+                    allInfos.remove(uuid);
+                    this.db.addPlayer(uuid.toString(), event.getPlayer().getName(), user);
+                    Bukkit.getScheduler().runTask(this, () -> {
+                        event.getPlayer().sendMessage(
+                                "Der Account " + event.getPlayer().getName() + " wurde erfolgreich mit dem FET Account " + user.ldapName + " verbunden!\r\n" +
+                                "Danke " + user.firstName + " " + user.lastName + " das du dich für den FET Server angemeldet hast! Ab jetzt kannst du so spielen wie du es gewohnt bist!");
+                        event.getPlayer().setGameMode(GameMode.SURVIVAL);
+                        event.getPlayer().setHealth(20);
+                        event.getPlayer().setFoodLevel(20);
+                        event.getPlayer().setAllowFlight(false);
+                        event.getPlayer().resetTitle();
+                    });
+                } else {
+                    event.getPlayer().sendMessage("That did not work, please try again!\nPlease enter your Username");
+                    // Send the title text
+                    event.getPlayer().sendTitlePart(net.kyori.adventure.title.TitlePart.TITLE,
+                            Component.text("§cBenutzername"));
+
+                    // Send the subtitle text
+                    event.getPlayer().sendTitlePart(net.kyori.adventure.title.TitlePart.SUBTITLE,
+                            Component.text("§eBitte gib den Benutzernamen deines FET Accounts ein!"));
+                    allInfos.get(uuid).reset();
+                }
+                break;
+        }
+        return;
+
+    }
+
+    private LdapUser checkLdap(String username, String password) {
+        getLogger().log(Level.INFO, "Checking LDAP for user " + username);
+        return Ldap.authenticate(username, password);
+        //return true;
+    }
+
+}

src/main/resources/plugin.yml

@@ -0,0 +1,11 @@
+name: FetMCPlugin
+version: 1.0.0
+main: de.sebastianvonhelmersen.fetmcplugin
+description: Plugin handeling logging in and authorization for FET
+author: Sebastian von Helmersen
+website: https://sebastianvonhelmersen.de
+api-version: '1.21.10'
+commands:
+  fetAuthPlayer:
+    description: Registriert einen Minecraft UUID
+    usage: /hello