diff --git a/Backend/.gitignore b/Backend/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..c2065bc26202b2d072aca3efc3d1c2efad3afcbf
--- /dev/null
+++ b/Backend/.gitignore
@@ -0,0 +1,37 @@
+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
diff --git a/Backend/build.gradle b/Backend/build.gradle
new file mode 100644
index 0000000000000000000000000000000000000000..7393bcd640dd20583d0c9601f3e95f6438e16e48
--- /dev/null
+++ b/Backend/build.gradle
@@ -0,0 +1,35 @@
+plugins {
+ id 'org.springframework.boot' version '2.6.7'
+ id 'io.spring.dependency-management' version '1.0.11.RELEASE'
+ id 'java'
+}
+
+group = 'hsrt.inf2p'
+version = '0.0.1-SNAPSHOT'
+sourceCompatibility = '11'
+
+configurations {
+ compileOnly {
+ extendsFrom annotationProcessor
+ }
+}
+
+repositories {
+ mavenCentral()
+}
+
+dependencies {
+ implementation 'org.springframework.boot:spring-boot-starter-web'
+ implementation 'org.springframework.boot:spring-boot-starter-web-services'
+ implementation 'org.springframework.boot:spring-boot-starter-validation'
+ implementation 'org.springframework.session:spring-session-core'
+ implementation 'org.jetbrains:annotations:23.0.0'
+ compileOnly 'org.projectlombok:lombok'
+ developmentOnly 'org.springframework.boot:spring-boot-devtools'
+ annotationProcessor 'org.projectlombok:lombok'
+ testImplementation 'org.springframework.boot:spring-boot-starter-test'
+}
+
+tasks.named('test') {
+ useJUnitPlatform()
+}
diff --git a/Backend/gradle/wrapper/gradle-wrapper.jar b/Backend/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000000000000000000000000000000000000..41d9927a4d4fb3f96a785543079b8df6723c946b
Binary files /dev/null and b/Backend/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/Backend/gradle/wrapper/gradle-wrapper.properties b/Backend/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000000000000000000000000000000000000..41dfb87909a877d96c3af4adccce4c7a301b55a2
--- /dev/null
+++ b/Backend/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/Backend/gradlew b/Backend/gradlew
new file mode 100644
index 0000000000000000000000000000000000000000..1b6c787337ffb79f0e3cf8b1e9f00f680a959de1
--- /dev/null
+++ b/Backend/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 "$JAVACMD" "$@"
diff --git a/Backend/gradlew.bat b/Backend/gradlew.bat
new file mode 100644
index 0000000000000000000000000000000000000000..107acd32c4e687021ef32db511e8a206129b88ec
--- /dev/null
+++ b/Backend/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
diff --git a/Backend/settings.gradle b/Backend/settings.gradle
new file mode 100644
index 0000000000000000000000000000000000000000..99c8523c5dadc522a57001b289da07d3a63b63bf
--- /dev/null
+++ b/Backend/settings.gradle
@@ -0,0 +1 @@
+rootProject.name = 'backendApi'
diff --git a/Backend/src/main/java/hsrt/VSundSOA/backendapi/Field.java b/Backend/src/main/java/hsrt/VSundSOA/backendapi/Field.java
new file mode 100644
index 0000000000000000000000000000000000000000..9d8094c843c83b34778ede02183aaace6735af9f
--- /dev/null
+++ b/Backend/src/main/java/hsrt/VSundSOA/backendapi/Field.java
@@ -0,0 +1,49 @@
+package hsrt.VSundSOA.backendapi;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class Field {
+ private int[][] startField = new int[9][9];
+ private int[][] solutionField = new int[9][9];
+
+ private int cellsToFill;
+
+ public void field(){
+ int[] sampleStart =
+ {-1,-1,-1, 1,-1,-1,-1,-1, 4,
+ 8,-1, 5, 3,-1, 6,-1,-1, 9,
+ 2,-1,-1,-1, 9, 5,-1, 6,-1,
+ 5, 3, 8,-1, 6,-1,-1,-1, 2,
+ 4,-1, 2,-1,-1, 9, 8,-1,-1,
+ -1,-1,-1,-1,-1, 4,-1,-1, 3,
+ -1,-1, 3, 6, 2,-1, 4,-1, 1,
+ 6, 8,-1, 4, 1,-1, 7,-1,-1,
+ -1,-1, 4, 9,-1,-1,-1,-1, 8};
+ int[] sampleSolution =
+ { 3, 9, 6, 1, 7, 2, 5, 8, 4,
+ 8, 7, 5, 3, 4, 6, 2, 1, 9,
+ 2, 4, 1, 8, 9, 5, 3, 6, 7,
+ 5, 3, 8, 7, 6, 1, 9, 4, 2,
+ 4, 1, 2, 5, 3, 9, 8, 7, 6,
+ 9, 6, 7, 2, 8, 4, 1, 5, 3,
+ 7, 5, 3, 6, 2, 8, 4, 9, 1,
+ 6, 8, 9, 4, 1, 3, 7, 2, 5,
+ 1, 2, 4, 9, 5, 7, 6, 3, 8};
+
+ cellsToFill = 0;
+ int iterator = 0;
+ for (int row = 0; row < 9; row++){
+ for (int col = 0; col < 9; col++){
+ startField[row][col] = sampleStart[iterator];
+ solutionField[row][col] = sampleSolution[iterator];
+ iterator++;
+ if (startField[row][col] == -1){
+ cellsToFill++;
+ }
+ }
+ }
+ }
+}
diff --git a/Backend/src/main/java/hsrt/VSundSOA/backendapi/GameAPI.java b/Backend/src/main/java/hsrt/VSundSOA/backendapi/GameAPI.java
new file mode 100644
index 0000000000000000000000000000000000000000..34790f981e7a8153c516a6af85801f6946840297
--- /dev/null
+++ b/Backend/src/main/java/hsrt/VSundSOA/backendapi/GameAPI.java
@@ -0,0 +1,12 @@
+package hsrt.VSundSOA.backendapi;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication //startet das backend
+public class GameAPI {
+ public static void main(String[] args) {
+ SpringApplication.run(GameAPI.class, args);
+ }
+
+}
diff --git a/Backend/src/main/java/hsrt/VSundSOA/backendapi/GameController.java b/Backend/src/main/java/hsrt/VSundSOA/backendapi/GameController.java
new file mode 100644
index 0000000000000000000000000000000000000000..b5edf7acbf41e9d9d70e50cec172b8fd2ac720f9
--- /dev/null
+++ b/Backend/src/main/java/hsrt/VSundSOA/backendapi/GameController.java
@@ -0,0 +1,60 @@
+package hsrt.VSundSOA.backendapi;
+
+import org.jetbrains.annotations.NotNull;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.*;
+
+import javax.annotation.PostConstruct;
+import javax.validation.Valid;
+import java.util.*;
+
+@CrossOrigin(origins = "*")
+@RestController
+public class GameController {
+ private ArrayList<String> history = new ArrayList<>();
+ private Field field = new Field();
+
+ @PostConstruct
+ private void init(){
+ field.field();
+ }
+
+ @ResponseStatus(HttpStatus.OK)
+ @GetMapping("/fields")
+ public ArrayList<int[][]> GetFields(){
+ ArrayList<int[][]> fields = new ArrayList<>();
+ fields.add(field.getStartField());
+ fields.add(field.getSolutionField());
+ return fields;
+ }
+
+ @ResponseStatus(HttpStatus.OK)
+ @PutMapping("/game/{username}")
+ public Boolean ValidatePlacement(@PathVariable(name = "username") String username, @Valid @RequestBody @NotNull String placement){
+ String[] placementValues = placement.split(" ", 3);
+ int x = Integer.parseInt(placementValues[0]);
+ int y = Integer.parseInt(placementValues[1]);
+ int value = Integer.parseInt(placementValues[2]);
+
+ if (field.getSolutionField()[x][y] == value){
+ history.add(username.concat(" " + placement));
+ return true;
+ }
+ return false;
+ }
+
+ @ResponseStatus(HttpStatus.OK)
+ @GetMapping("/game/win")
+ public Boolean VerifyWin(){
+ if (field.getCellsToFill() <= history.size()){
+ return true;
+ }
+ return false;
+ }
+
+ @ResponseStatus(HttpStatus.OK)
+ @GetMapping("/game/history")
+ private ArrayList<String> getHistory(){
+ return history;
+ }
+}
diff --git a/Backend/src/main/resources/application.properties b/Backend/src/main/resources/application.properties
new file mode 100644
index 0000000000000000000000000000000000000000..8b137891791fe96927ad78e64b0aad7bded08bdc
--- /dev/null
+++ b/Backend/src/main/resources/application.properties
@@ -0,0 +1 @@
+
diff --git a/Backend/src/test/java/hsrt/VSundSOA/backendapi/RunTest.java b/Backend/src/test/java/hsrt/VSundSOA/backendapi/RunTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..a5de68549d26e9382691da45dd3811186af7c3e8
--- /dev/null
+++ b/Backend/src/test/java/hsrt/VSundSOA/backendapi/RunTest.java
@@ -0,0 +1,9 @@
+package hsrt.VSundSOA.backendapi;
+
+import java.io.IOException;
+
+public class RunTest {
+ public static void main(String[] args) throws IOException {
+ System.out.println("Test geht los\n");
+ }
+}