Initial commit

.gitignore

@@ -0,0 +1,33 @@
+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

.gitlab-ci.yml

@@ -0,0 +1,4 @@
+include:
+  - project: 'gitlab/gitlab'
+    ref: 'main'
+    file: 'ci-templates/maven_deps.yml'

.mvn/wrapper/maven-wrapper.properties

@@ -0,0 +1,18 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.8.7/apache-maven-3.8.7-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.1/maven-wrapper-3.1.1.jar

mvnw

@@ -0,0 +1,316 @@
+#!/bin/sh
+# ----------------------------------------------------------------------------
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# Maven Start Up Batch script
+#
+# Required ENV vars:
+# ------------------
+#   JAVA_HOME - location of a JDK home dir
+#
+# Optional ENV vars
+# -----------------
+#   M2_HOME - location of maven2's installed home dir
+#   MAVEN_OPTS - parameters passed to the Java VM when running Maven
+#     e.g. to debug Maven itself, use
+#       set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+#   MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+# ----------------------------------------------------------------------------
+
+if [ -z "$MAVEN_SKIP_RC" ] ; then
+
+  if [ -f /usr/local/etc/mavenrc ] ; then
+    . /usr/local/etc/mavenrc
+  fi
+
+  if [ -f /etc/mavenrc ] ; then
+    . /etc/mavenrc
+  fi
+
+  if [ -f "$HOME/.mavenrc" ] ; then
+    . "$HOME/.mavenrc"
+  fi
+
+fi
+
+# OS specific support.  $var _must_ be set to either true or false.
+cygwin=false;
+darwin=false;
+mingw=false
+case "`uname`" in
+  CYGWIN*) cygwin=true ;;
+  MINGW*) mingw=true;;
+  Darwin*) darwin=true
+    # Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home
+    # See https://developer.apple.com/library/mac/qa/qa1170/_index.html
+    if [ -z "$JAVA_HOME" ]; then
+      if [ -x "/usr/libexec/java_home" ]; then
+        export JAVA_HOME="`/usr/libexec/java_home`"
+      else
+        export JAVA_HOME="/Library/Java/Home"
+      fi
+    fi
+    ;;
+esac
+
+if [ -z "$JAVA_HOME" ] ; then
+  if [ -r /etc/gentoo-release ] ; then
+    JAVA_HOME=`java-config --jre-home`
+  fi
+fi
+
+if [ -z "$M2_HOME" ] ; then
+  ## resolve links - $0 may be a link to maven's home
+  PRG="$0"
+
+  # need this for relative symlinks
+  while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+      PRG="$link"
+    else
+      PRG="`dirname "$PRG"`/$link"
+    fi
+  done
+
+  saveddir=`pwd`
+
+  M2_HOME=`dirname "$PRG"`/..
+
+  # make it fully qualified
+  M2_HOME=`cd "$M2_HOME" && pwd`
+
+  cd "$saveddir"
+  # echo Using m2 at $M2_HOME
+fi
+
+# For Cygwin, ensure paths are in UNIX format before anything is touched
+if $cygwin ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --unix "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --unix "$CLASSPATH"`
+fi
+
+# For Mingw, ensure paths are in UNIX format before anything is touched
+if $mingw ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME="`(cd "$M2_HOME"; pwd)`"
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`"
+fi
+
+if [ -z "$JAVA_HOME" ]; then
+  javaExecutable="`which javac`"
+  if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then
+    # readlink(1) is not available as standard on Solaris 10.
+    readLink=`which readlink`
+    if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then
+      if $darwin ; then
+        javaHome="`dirname \"$javaExecutable\"`"
+        javaExecutable="`cd \"$javaHome\" && pwd -P`/javac"
+      else
+        javaExecutable="`readlink -f \"$javaExecutable\"`"
+      fi
+      javaHome="`dirname \"$javaExecutable\"`"
+      javaHome=`expr "$javaHome" : '\(.*\)/bin'`
+      JAVA_HOME="$javaHome"
+      export JAVA_HOME
+    fi
+  fi
+fi
+
+if [ -z "$JAVACMD" ] ; then
+  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
+  else
+    JAVACMD="`\\unset -f command; \\command -v java`"
+  fi
+fi
+
+if [ ! -x "$JAVACMD" ] ; then
+  echo "Error: JAVA_HOME is not defined correctly." >&2
+  echo "  We cannot execute $JAVACMD" >&2
+  exit 1
+fi
+
+if [ -z "$JAVA_HOME" ] ; then
+  echo "Warning: JAVA_HOME environment variable is not set."
+fi
+
+CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher
+
+# traverses directory structure from process work directory to filesystem root
+# first directory with .mvn subdirectory is considered project base directory
+find_maven_basedir() {
+
+  if [ -z "$1" ]
+  then
+    echo "Path not specified to find_maven_basedir"
+    return 1
+  fi
+
+  basedir="$1"
+  wdir="$1"
+  while [ "$wdir" != '/' ] ; do
+    if [ -d "$wdir"/.mvn ] ; then
+      basedir=$wdir
+      break
+    fi
+    # workaround for JBEAP-8937 (on Solaris 10/Sparc)
+    if [ -d "${wdir}" ]; then
+      wdir=`cd "$wdir/.."; pwd`
+    fi
+    # end of workaround
+  done
+  echo "${basedir}"
+}
+
+# concatenates all lines of a file
+concat_lines() {
+  if [ -f "$1" ]; then
+    echo "$(tr -s '\n' ' ' < "$1")"
+  fi
+}
+
+BASE_DIR=`find_maven_basedir "$(pwd)"`
+if [ -z "$BASE_DIR" ]; then
+  exit 1;
+fi
+
+##########################################################################################
+# Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+# This allows using the maven wrapper in projects that prohibit checking in binary data.
+##########################################################################################
+if [ -r "$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" ]; then
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Found .mvn/wrapper/maven-wrapper.jar"
+    fi
+else
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Couldn't find .mvn/wrapper/maven-wrapper.jar, downloading it ..."
+    fi
+    if [ -n "$MVNW_REPOURL" ]; then
+      jarUrl="$MVNW_REPOURL/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+    else
+      jarUrl="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+    fi
+    while IFS="=" read key value; do
+      case "$key" in (wrapperUrl) jarUrl="$value"; break ;;
+      esac
+    done < "$BASE_DIR/.mvn/wrapper/maven-wrapper.properties"
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Downloading from: $jarUrl"
+    fi
+    wrapperJarPath="$BASE_DIR/.mvn/wrapper/maven-wrapper.jar"
+    if $cygwin; then
+      wrapperJarPath=`cygpath --path --windows "$wrapperJarPath"`
+    fi
+
+    if command -v wget > /dev/null; then
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found wget ... using wget"
+        fi
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            wget "$jarUrl" -O "$wrapperJarPath" || rm -f "$wrapperJarPath"
+        else
+            wget --http-user=$MVNW_USERNAME --http-password=$MVNW_PASSWORD "$jarUrl" -O "$wrapperJarPath" || rm -f "$wrapperJarPath"
+        fi
+    elif command -v curl > /dev/null; then
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found curl ... using curl"
+        fi
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            curl -o "$wrapperJarPath" "$jarUrl" -f
+        else
+            curl --user $MVNW_USERNAME:$MVNW_PASSWORD -o "$wrapperJarPath" "$jarUrl" -f
+        fi
+
+    else
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Falling back to using Java to download"
+        fi
+        javaClass="$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.java"
+        # For Cygwin, switch paths to Windows format before running javac
+        if $cygwin; then
+          javaClass=`cygpath --path --windows "$javaClass"`
+        fi
+        if [ -e "$javaClass" ]; then
+            if [ ! -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Compiling MavenWrapperDownloader.java ..."
+                fi
+                # Compiling the Java class
+                ("$JAVA_HOME/bin/javac" "$javaClass")
+            fi
+            if [ -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+                # Running the downloader
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Running MavenWrapperDownloader.java ..."
+                fi
+                ("$JAVA_HOME/bin/java" -cp .mvn/wrapper MavenWrapperDownloader "$MAVEN_PROJECTBASEDIR")
+            fi
+        fi
+    fi
+fi
+##########################################################################################
+# End of extension
+##########################################################################################
+
+export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"}
+if [ "$MVNW_VERBOSE" = true ]; then
+  echo $MAVEN_PROJECTBASEDIR
+fi
+MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --path --windows "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --windows "$CLASSPATH"`
+  [ -n "$MAVEN_PROJECTBASEDIR" ] &&
+    MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"`
+fi
+
+# Provide a "standardized" way to retrieve the CLI args that will
+# work with both Windows and non-Windows executions.
+MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $@"
+export MAVEN_CMD_LINE_ARGS
+
+WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+exec "$JAVACMD" \
+  $MAVEN_OPTS \
+  $MAVEN_DEBUG_OPTS \
+  -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
+  "-Dmaven.home=${M2_HOME}" \
+  "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
+  ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"

mvnw.cmd

@@ -0,0 +1,188 @@
+@REM ----------------------------------------------------------------------------
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements.  See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership.  The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License.  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,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied.  See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+@REM ----------------------------------------------------------------------------
+
+@REM ----------------------------------------------------------------------------
+@REM Maven Start Up Batch script
+@REM
+@REM Required ENV vars:
+@REM JAVA_HOME - location of a JDK home dir
+@REM
+@REM Optional ENV vars
+@REM M2_HOME - location of maven2's installed home dir
+@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
+@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending
+@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
+@REM     e.g. to debug Maven itself, use
+@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+@REM ----------------------------------------------------------------------------
+
+@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
+@echo off
+@REM set title of command window
+title %0
+@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
+@if "%MAVEN_BATCH_ECHO%" == "on"  echo %MAVEN_BATCH_ECHO%
+
+@REM set %HOME% to equivalent of $HOME
+if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
+
+@REM Execute a user defined script before this one
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
+@REM check for pre script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_pre.bat" call "%USERPROFILE%\mavenrc_pre.bat" %*
+if exist "%USERPROFILE%\mavenrc_pre.cmd" call "%USERPROFILE%\mavenrc_pre.cmd" %*
+:skipRcPre
+
+@setlocal
+
+set ERROR_CODE=0
+
+@REM To isolate internal variables from possible post scripts, we use another setlocal
+@setlocal
+
+@REM ==== START VALIDATION ====
+if not "%JAVA_HOME%" == "" goto OkJHome
+
+echo.
+echo Error: JAVA_HOME not found in your environment. >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+:OkJHome
+if exist "%JAVA_HOME%\bin\java.exe" goto init
+
+echo.
+echo Error: JAVA_HOME is set to an invalid directory. >&2
+echo JAVA_HOME = "%JAVA_HOME%" >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+@REM ==== END VALIDATION ====
+
+:init
+
+@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
+@REM Fallback to current working directory if not found.
+
+set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
+IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
+
+set EXEC_DIR=%CD%
+set WDIR=%EXEC_DIR%
+:findBaseDir
+IF EXIST "%WDIR%"\.mvn goto baseDirFound
+cd ..
+IF "%WDIR%"=="%CD%" goto baseDirNotFound
+set WDIR=%CD%
+goto findBaseDir
+
+:baseDirFound
+set MAVEN_PROJECTBASEDIR=%WDIR%
+cd "%EXEC_DIR%"
+goto endDetectBaseDir
+
+:baseDirNotFound
+set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
+cd "%EXEC_DIR%"
+
+:endDetectBaseDir
+
+IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
+
+@setlocal EnableExtensions EnableDelayedExpansion
+for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
+@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
+
+:endReadAdditionalConfig
+
+SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
+set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar"
+set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+set DOWNLOAD_URL="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+
+FOR /F "usebackq tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
+    IF "%%A"=="wrapperUrl" SET DOWNLOAD_URL=%%B
+)
+
+@REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+@REM This allows using the maven wrapper in projects that prohibit checking in binary data.
+if exist %WRAPPER_JAR% (
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Found %WRAPPER_JAR%
+    )
+) else (
+    if not "%MVNW_REPOURL%" == "" (
+        SET DOWNLOAD_URL="%MVNW_REPOURL%/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+    )
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Couldn't find %WRAPPER_JAR%, downloading it ...
+        echo Downloading from: %DOWNLOAD_URL%
+    )
+
+    powershell -Command "&{"^
+		"$webclient = new-object System.Net.WebClient;"^
+		"if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and [string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^
+		"$webclient.Credentials = new-object System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^
+		"}"^
+		"[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%DOWNLOAD_URL%', '%WRAPPER_JAR%')"^
+		"}"
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Finished downloading %WRAPPER_JAR%
+    )
+)
+@REM End of extension
+
+@REM Provide a "standardized" way to retrieve the CLI args that will
+@REM work with both Windows and non-Windows executions.
+set MAVEN_CMD_LINE_ARGS=%*
+
+%MAVEN_JAVA_EXE% ^
+  %JVM_CONFIG_MAVEN_PROPS% ^
+  %MAVEN_OPTS% ^
+  %MAVEN_DEBUG_OPTS% ^
+  -classpath %WRAPPER_JAR% ^
+  "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" ^
+  %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
+if ERRORLEVEL 1 goto error
+goto end
+
+:error
+set ERROR_CODE=1
+
+:end
+@endlocal & set ERROR_CODE=%ERROR_CODE%
+
+if not "%MAVEN_SKIP_RC%"=="" goto skipRcPost
+@REM check for post script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_post.bat" call "%USERPROFILE%\mavenrc_post.bat"
+if exist "%USERPROFILE%\mavenrc_post.cmd" call "%USERPROFILE%\mavenrc_post.cmd"
+:skipRcPost
+
+@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
+if "%MAVEN_BATCH_PAUSE%"=="on" pause
+
+if "%MAVEN_TERMINATE_CMD%"=="on" exit %ERROR_CODE%
+
+cmd /C exit /B %ERROR_CODE%

pom.xml

@@ -0,0 +1,68 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>3.0.5</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <groupId>com.knecon.fforesight</groupId>
+    <artifactId>keycloak-commons</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <name>keycloak-commons</name>
+    <description>keycloak-commons</description>
+    <properties>
+        <java.version>17</java.version>
+        <keycloak.version>21.0.1</keycloak.version>
+        <commons-validator.version>1.7</commons-validator.version>
+        <tennat-commons.version>1.0-SNAPSHOT</tennat-commons.version>
+    </properties>
+    <dependencies>
+
+        <dependency>
+            <groupId>com.knecon.fforesight</groupId>
+            <artifactId>tenant-commons</artifactId>
+            <version>${tennat-commons.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.keycloak</groupId>
+            <artifactId>keycloak-admin-client</artifactId>
+            <version>${keycloak.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-oauth2-resource-server</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-security</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-configuration-processor</artifactId>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+</project>

src/main/java/com/knecon/fforesight/keycloakcommons/DefaultKeyCloakCommonsAutoConfiguration.java

@@ -0,0 +1,14 @@
+package com.knecon.fforesight.keycloakcommons;
+
+import org.springframework.boot.autoconfigure.AutoConfiguration;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.ComponentScan;
+
+import com.knecon.fforesight.keycloakcommons.security.properties.CommonsKeyCloakProperties;
+
+@ComponentScan
+@AutoConfiguration
+@EnableConfigurationProperties(CommonsKeyCloakProperties.class)
+public class DefaultKeyCloakCommonsAutoConfiguration {
+
+}

src/main/java/com/knecon/fforesight/keycloakcommons/security/CustomJwtAuthoritiesConverter.java

@@ -0,0 +1,41 @@
+package com.knecon.fforesight.keycloakcommons.security;
+
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.security.core.GrantedAuthority;
+import org.springframework.security.core.authority.SimpleGrantedAuthority;
+import org.springframework.security.oauth2.jwt.Jwt;
+
+import com.knecon.fforesight.tenantcommons.model.AuthDetails;
+
+public class CustomJwtAuthoritiesConverter implements Converter<Jwt, Collection<GrantedAuthority>> {
+
+    private final AuthDetails authDetails;
+
+
+    public CustomJwtAuthoritiesConverter(AuthDetails authDetails) {
+
+        this.authDetails = authDetails;
+    }
+
+
+    @Override
+    public Collection<GrantedAuthority> convert(Jwt source) {
+
+        Map<String, Map<String, List<String>>> resourceAccess = source.getClaim("resource_access");
+
+        var unfilteredPermissions = resourceAccess.values().stream().map(Map::values).flatMap(Collection::stream).flatMap(List::stream).toList();
+
+        var allValidRoles = new HashSet<>();
+        allValidRoles.addAll(authDetails.getClientRoles());
+        allValidRoles.addAll(authDetails.getRealmRoles());
+
+        return unfilteredPermissions.stream().filter(allValidRoles::contains).map(SimpleGrantedAuthority::new).collect(Collectors.toList());
+    }
+
+}

src/main/java/com/knecon/fforesight/keycloakcommons/security/KeycloakSecurity.java

@@ -0,0 +1,40 @@
+package com.knecon.fforesight.keycloakcommons.security;
+
+import java.util.Optional;
+
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.security.oauth2.server.resource.authentication.JwtAuthenticationToken;
+
+import lombok.experimental.UtilityClass;
+import lombok.extern.slf4j.Slf4j;
+
+/**
+ * Collection of helpful functions to easily access information about an authenticated user.
+ */
+@Slf4j
+@UtilityClass
+public class KeycloakSecurity {
+
+    /**
+     * Determines the unique identifier for the currently logged in user.
+     *
+     * @return The unique user identifier. Never {@code null}.
+     */
+    public String getUserId() {
+
+        Authentication auth = SecurityContextHolder.getContext().getAuthentication();
+        if (auth == null) {
+            return "anonymousUser";
+        }
+        return auth.getName();
+    }
+
+
+    public Optional<String> getRealm() {
+
+        var authentication = (JwtAuthenticationToken) SecurityContextHolder.getContext().getAuthentication();
+        return Optional.of(TokenUtils.toTenant(authentication.getToken().getTokenValue()));
+    }
+
+}

src/main/java/com/knecon/fforesight/keycloakcommons/security/SecuredKeyCloakConfiguration.java

@@ -0,0 +1,90 @@
+package com.knecon.fforesight.keycloakcommons.security;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.HttpStatus;
+import org.springframework.security.authentication.AuthenticationManager;
+import org.springframework.security.config.annotation.method.configuration.EnableMethodSecurity;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
+import org.springframework.security.config.annotation.web.configuration.WebSecurityCustomizer;
+import org.springframework.security.config.http.SessionCreationPolicy;
+import org.springframework.security.oauth2.core.DelegatingOAuth2TokenValidator;
+import org.springframework.security.oauth2.core.OAuth2TokenValidator;
+import org.springframework.security.oauth2.jwt.Jwt;
+import org.springframework.security.oauth2.jwt.JwtDecoder;
+import org.springframework.security.oauth2.jwt.JwtValidators;
+import org.springframework.security.oauth2.jwt.NimbusJwtDecoder;
+import org.springframework.security.web.SecurityFilterChain;
+import org.springframework.security.web.authentication.HttpStatusEntryPoint;
+
+import com.knecon.fforesight.keycloakcommons.security.properties.CommonsKeyCloakProperties;
+import com.nimbusds.jose.proc.SecurityContext;
+import com.nimbusds.jwt.proc.ConfigurableJWTProcessor;
+import com.nimbusds.jwt.proc.DefaultJWTProcessor;
+import com.nimbusds.jwt.proc.JWTProcessor;
+
+import lombok.RequiredArgsConstructor;
+
+@Configuration
+@EnableWebSecurity
+@RequiredArgsConstructor
+@EnableMethodSecurity
+public class SecuredKeyCloakConfiguration {
+
+    private final TenantAuthenticationManagerResolver tenantAuthenticationManagerResolver;
+
+
+    @Bean
+    JWTProcessor jwtProcessor(TenantJWSKeySelector keySelector) {
+
+        ConfigurableJWTProcessor<SecurityContext> jwtProcessor = new DefaultJWTProcessor<>();
+        jwtProcessor.setJWTClaimsSetAwareJWSKeySelector(keySelector);
+        return jwtProcessor;
+    }
+
+
+    @Bean
+    JwtDecoder jwtDecoder(JWTProcessor jwtProcessor, OAuth2TokenValidator<Jwt> jwtValidator) {
+
+        NimbusJwtDecoder decoder = new NimbusJwtDecoder(jwtProcessor);
+        OAuth2TokenValidator<Jwt> validator = new DelegatingOAuth2TokenValidator<>(JwtValidators.createDefault(), jwtValidator);
+        decoder.setJwtValidator(validator);
+        return decoder;
+    }
+
+
+    @Bean
+    AuthenticationManager mockAuthenticationManager() {
+
+        return authentication -> null;
+    }
+
+
+    @Bean
+    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
+
+        http.anonymous().disable();
+        http.httpBasic().disable();
+        http.csrf().disable();
+
+        http.oauth2ResourceServer(oauth2 -> oauth2.authenticationManagerResolver(tenantAuthenticationManagerResolver));
+        http.authorizeHttpRequests().anyRequest().authenticated();
+        http.sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS);
+        http.exceptionHandling().authenticationEntryPoint(new HttpStatusEntryPoint(HttpStatus.UNAUTHORIZED));
+
+        return http.build();
+    }
+
+
+    @Bean
+    public WebSecurityCustomizer webSecurityCustomizer(CommonsKeyCloakProperties commonsKeyCloakProperties) {
+
+        return (web) -> web.debug(false)
+                .ignoring()
+                .requestMatchers(commonsKeyCloakProperties.getIgnoredEndpoints().toArray(new String[0]))
+                .requestMatchers(HttpMethod.OPTIONS, "/**");
+    }
+
+}

src/main/java/com/knecon/fforesight/keycloakcommons/security/TenantAuthenticationManagerResolver.java

@@ -0,0 +1,58 @@
+package com.knecon.fforesight.keycloakcommons.security;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+
+import org.springframework.security.authentication.AuthenticationManager;
+import org.springframework.security.authentication.AuthenticationManagerResolver;
+import org.springframework.security.oauth2.jwt.JwtDecoders;
+import org.springframework.security.oauth2.server.resource.authentication.JwtAuthenticationConverter;
+import org.springframework.security.oauth2.server.resource.authentication.JwtAuthenticationProvider;
+import org.springframework.security.oauth2.server.resource.web.BearerTokenResolver;
+import org.springframework.security.oauth2.server.resource.web.DefaultBearerTokenResolver;
+import org.springframework.stereotype.Component;
+
+import com.knecon.fforesight.tenantcommons.TenantProvider;
+
+import jakarta.servlet.http.HttpServletRequest;
+import lombok.RequiredArgsConstructor;
+
+@Component
+@RequiredArgsConstructor
+public class TenantAuthenticationManagerResolver implements AuthenticationManagerResolver<HttpServletRequest> {
+
+    private final BearerTokenResolver resolver = new DefaultBearerTokenResolver();
+    private final TenantProvider tenantProvider;
+
+    private final Map<String, AuthenticationManager> authenticationManagers = new HashMap<>();
+
+
+    @Override
+    public AuthenticationManager resolve(HttpServletRequest request) {
+
+        return this.authenticationManagers.computeIfAbsent(toTenant(request), this::fromTenant);
+    }
+
+
+    private String toTenant(HttpServletRequest request) {
+
+        return TokenUtils.toTenant(this.resolver.resolve(request));
+    }
+
+
+    private AuthenticationManager fromTenant(String tenant) {
+
+        return Optional.ofNullable(this.tenantProvider.getTenant(tenant)).map(tt ->
+
+        {
+            var provider = new JwtAuthenticationProvider(JwtDecoders.fromIssuerLocation(tt.getAuthDetails().getIssuer()));
+            var converter = new JwtAuthenticationConverter();
+            converter.setJwtGrantedAuthoritiesConverter(new CustomJwtAuthoritiesConverter(tt.getAuthDetails()));
+            provider.setJwtAuthenticationConverter(converter);
+            return provider;
+        }).orElseThrow(() -> new IllegalArgumentException("unknown tenant"))::authenticate;
+    }
+
+}
+

src/main/java/com/knecon/fforesight/keycloakcommons/security/TenantJWSKeySelector.java

@@ -0,0 +1,62 @@
+package com.knecon.fforesight.keycloakcommons.security;
+
+import java.net.URL;
+import java.security.Key;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.springframework.stereotype.Component;
+
+import com.knecon.fforesight.tenantcommons.TenantProvider;
+import com.nimbusds.jose.JWSHeader;
+import com.nimbusds.jose.KeySourceException;
+import com.nimbusds.jose.proc.JWSAlgorithmFamilyJWSKeySelector;
+import com.nimbusds.jose.proc.JWSKeySelector;
+import com.nimbusds.jose.proc.SecurityContext;
+import com.nimbusds.jwt.JWTClaimsSet;
+import com.nimbusds.jwt.proc.JWTClaimsSetAwareJWSKeySelector;
+
+import lombok.RequiredArgsConstructor;
+
+@Component
+@RequiredArgsConstructor
+public class TenantJWSKeySelector implements JWTClaimsSetAwareJWSKeySelector<SecurityContext> {
+
+    private final TenantProvider tenants;
+    private final Map<String, JWSKeySelector<SecurityContext>> selectors = new ConcurrentHashMap<>();
+
+
+    @Override
+    public List<? extends Key> selectKeys(JWSHeader jwsHeader, JWTClaimsSet jwtClaimsSet, SecurityContext securityContext) throws KeySourceException {
+
+        return this.selectors.computeIfAbsent(toTenant(jwtClaimsSet), this::fromTenant).selectJWSKeys(jwsHeader, securityContext);
+    }
+
+
+    private String toTenant(JWTClaimsSet claimSet) {
+
+        return TokenUtils.toTenant(claimSet);
+    }
+
+
+    private JWSKeySelector<SecurityContext> fromTenant(String tenant) {
+
+        return Optional.ofNullable(this.tenants.getTenant(tenant))
+                .map(t -> t.getAuthDetails().getJwksUri())
+                .map(this::fromUri)
+                .orElseThrow(() -> new IllegalArgumentException("unknown tenant"));
+    }
+
+
+    private JWSKeySelector<SecurityContext> fromUri(String uri) {
+
+        try {
+            return JWSAlgorithmFamilyJWSKeySelector.fromJWKSetURL(new URL(uri));
+        } catch (Exception ex) {
+            throw new IllegalArgumentException(ex);
+        }
+    }
+
+}

src/main/java/com/knecon/fforesight/keycloakcommons/security/TenantJwtIssuerValidator.java

@@ -0,0 +1,46 @@
+package com.knecon.fforesight.keycloakcommons.security;
+
+import java.util.Map;
+import java.util.Optional;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.springframework.security.oauth2.core.OAuth2TokenValidator;
+import org.springframework.security.oauth2.core.OAuth2TokenValidatorResult;
+import org.springframework.security.oauth2.jwt.Jwt;
+import org.springframework.security.oauth2.jwt.JwtIssuerValidator;
+import org.springframework.stereotype.Component;
+
+import com.knecon.fforesight.tenantcommons.TenantProvider;
+
+import lombok.RequiredArgsConstructor;
+
+@Component
+@RequiredArgsConstructor
+public class TenantJwtIssuerValidator implements OAuth2TokenValidator<Jwt> {
+
+    private final TenantProvider tenants;
+    private final Map<String, JwtIssuerValidator> validators = new ConcurrentHashMap<>();
+
+
+    @Override
+    public OAuth2TokenValidatorResult validate(Jwt token) {
+
+        return this.validators.computeIfAbsent(toTenant(token), this::fromTenant).validate(token);
+    }
+
+
+    private String toTenant(Jwt jwt) {
+
+        return jwt.getIssuer().toString();
+    }
+
+
+    private JwtIssuerValidator fromTenant(String tenant) {
+
+        return Optional.ofNullable(this.tenants.getTenant(tenant))
+                .map(t -> t.getAuthDetails().getIssuer())
+                .map(JwtIssuerValidator::new)
+                .orElseThrow(() -> new IllegalArgumentException("unknown tenant"));
+    }
+
+}

src/main/java/com/knecon/fforesight/keycloakcommons/security/TokenUtils.java

@@ -0,0 +1,37 @@
+package com.knecon.fforesight.keycloakcommons.security;
+
+import com.nimbusds.jwt.JWT;
+import com.nimbusds.jwt.JWTClaimsSet;
+import com.nimbusds.jwt.JWTParser;
+
+import lombok.SneakyThrows;
+
+public class TokenUtils {
+
+    @SneakyThrows
+    public static String toTenant(String token) {
+
+        return toTenant(JWTParser.parse(token));
+    }
+
+
+    public static String toTenant(JWT jwt) {
+
+        try {
+            var claims = jwt.getJWTClaimsSet();
+            return toTenant(claims);
+        } catch (Exception e) {
+            throw new IllegalArgumentException(e);
+        }
+    }
+
+
+    public static String toTenant(JWTClaimsSet claims) {
+
+        var issuer = claims.getClaim("iss");
+        var issuerString = issuer.toString();
+        var realm = issuerString.substring(issuerString.lastIndexOf("/") + 1);
+        return realm;
+    }
+
+}

src/main/java/com/knecon/fforesight/keycloakcommons/security/properties/CommonsKeyCloakProperties.java

@@ -0,0 +1,27 @@
+package com.knecon.fforesight.keycloakcommons.security.properties;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+import lombok.Data;
+
+@Data
+@ConfigurationProperties("commons.keycloak")
+public class CommonsKeyCloakProperties {
+
+    private String serverUrl;
+    private String realm;
+    private String applicationClientId;
+    private String clientId;
+    private String clientSecret;
+    private String basePath = "/";
+    private List<String> ignoredEndpoints = new ArrayList<>();
+    private int connectionPoolSize = 10;
+    private String applicationName;
+    private Integer tenantAccessTokenLifeSpan = 300;
+    private String defaultTheme = "fforesight";
+    private List<String> validRedirectUris = new ArrayList<>();
+
+}

src/main/resources/META-INF/spring.factories

@@ -0,0 +1 @@
+org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.knecon.fforesight.keycloakcommons.DefaultKeyCloakCommonsAutoConfiguration

src/test/java/com/knecon/fforesight/keycloakcommons/KeycloakCommonsApplicationTests.java

@@ -0,0 +1,14 @@
+package com.knecon.fforesight.keycloakcommons;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class KeycloakCommonsApplicationTests {
+
+    @Test
+    void contextLoads() {
+
+    }
+
+}