diff --git a/chat-app/.gitattributes b/chat-app/.gitattributes
new file mode 100644
index 00000000..3b41682a
--- /dev/null
+++ b/chat-app/.gitattributes
@@ -0,0 +1,2 @@
+/mvnw text eol=lf
+*.cmd text eol=crlf
diff --git a/chat-app/.gitignore b/chat-app/.gitignore
new file mode 100644
index 00000000..667aaef0
--- /dev/null
+++ b/chat-app/.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/
diff --git a/chat-app/.mvn/wrapper/maven-wrapper.properties b/chat-app/.mvn/wrapper/maven-wrapper.properties
new file mode 100644
index 00000000..216df058
--- /dev/null
+++ b/chat-app/.mvn/wrapper/maven-wrapper.properties
@@ -0,0 +1,3 @@
+wrapperVersion=3.3.4
+distributionType=only-script
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.16/apache-maven-3.9.16-bin.zip
diff --git a/chat-app/frontend/index.html b/chat-app/frontend/index.html
new file mode 100644
index 00000000..04de4403
--- /dev/null
+++ b/chat-app/frontend/index.html
@@ -0,0 +1,49 @@
+
+
+
+
+
+
+ Chat App
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/chat-app/frontend/script.js b/chat-app/frontend/script.js
new file mode 100644
index 00000000..f794bbb6
--- /dev/null
+++ b/chat-app/frontend/script.js
@@ -0,0 +1,134 @@
+const usernameInput = document.getElementById("usernameInput");
+const messageInput = document.getElementById("messageInput");
+const sendButton = document.getElementById("sendButton");
+const messagesDiv = document.getElementById("messages");
+const feedback = document.getElementById("feedback");
+
+
+sendButton.addEventListener("click", sendMessage);
+
+
+messageInput.addEventListener("keydown", function (event) {
+
+ if (event.key === "Enter") {
+ event.preventDefault();
+ sendMessage();
+ }
+
+});
+
+
+function sendMessage() {
+
+ const username = usernameInput.value.trim();
+ const content = messageInput.value.trim();
+
+ if (username === "") {
+ feedback.textContent = "Please enter your name.";
+ return;
+ }
+
+ if (content === "") {
+ feedback.textContent = "Message cannot be empty.";
+ return;
+ }
+
+ fetch(`http://localhost:8081/messages?username=${encodeURIComponent(username)}`, {
+ method: "POST",
+ headers: {
+ "Content-Type": "application/json"
+ },
+ body: JSON.stringify({
+ content: content
+ })
+ })
+ .then(response => {
+
+ if (!response.ok) {
+ throw new Error("Message could not be sent.");
+ }
+
+ return response.json();
+ })
+ .then(() => {
+
+ messageInput.value = "";
+ feedback.textContent = "";
+
+ loadMessages();
+ })
+ .catch(error => {
+
+ feedback.textContent = error.message;
+ });
+}
+
+
+function loadMessages() {
+
+ fetch("http://localhost:8081/messages")
+ .then(response => {
+
+ if (!response.ok) {
+ throw new Error("Could not load messages.");
+ }
+
+ return response.json();
+ })
+ .then(messages => {
+
+ messagesDiv.innerHTML = "";
+
+ messages.forEach(message => {
+
+ const messageElement = document.createElement("div");
+ messageElement.classList.add("message");
+
+ const usernameElement = document.createElement("span");
+ usernameElement.classList.add("username");
+
+ const contentElement = document.createElement("span");
+ contentElement.classList.add("content");
+
+ const timestampElement = document.createElement("span");
+ timestampElement.classList.add("timestamp");
+
+
+ if (message.user) {
+
+ usernameElement.textContent =
+ message.user.username + ":";
+
+ } else {
+
+ usernameElement.textContent = "Unknown user:";
+ }
+
+
+ contentElement.textContent = message.content;
+
+ timestampElement.textContent =
+ message.createdAt
+ ? new Date(message.createdAt).toLocaleString()
+ : "";
+
+
+ messageElement.appendChild(usernameElement);
+ messageElement.appendChild(contentElement);
+ messageElement.appendChild(timestampElement);
+
+ messagesDiv.appendChild(messageElement);
+ });
+
+ messagesDiv.scrollTop = messagesDiv.scrollHeight;
+ })
+ .catch(error => {
+
+ feedback.textContent = error.message;
+ });
+}
+
+
+loadMessages();
+
+setInterval(loadMessages, 2000);
\ No newline at end of file
diff --git a/chat-app/frontend/style.css b/chat-app/frontend/style.css
new file mode 100644
index 00000000..41a4e2f8
--- /dev/null
+++ b/chat-app/frontend/style.css
@@ -0,0 +1,111 @@
+
+* {
+ box-sizing: border-box;
+}
+
+body {
+ margin: 0;
+ font-family: Arial, sans-serif;
+ background-color: #f2f2f2;
+ height: 100vh;
+}
+
+.chat-container {
+ width: 90%;
+ max-width: 1000px;
+ height: 90vh;
+ margin: 5vh auto;
+ background-color: white;
+ border: 1px solid #ccc;
+ border-radius: 10px;
+
+ display: flex;
+ flex-direction: column;
+ overflow: hidden;
+}
+
+/* Top of chat */
+
+.chat-header {
+ background-color: #4a76a8;
+ color: white;
+ padding: 15px 20px;
+}
+
+.chat-header h1 {
+ margin: 0;
+ font-size: 24px;
+}
+
+/* Message area */
+
+.messages {
+ flex: 1;
+ padding: 20px;
+ overflow-y: auto;
+ background-color: #ffffff;
+}
+
+/* Individual message */
+
+.message {
+ margin-bottom: 12px;
+ font-size: 16px;
+}
+
+.username {
+ font-weight: bold;
+ margin-right: 8px;
+ color: #4a76a8;
+}
+
+.content {
+ color: #333;
+}
+
+.timestamp {
+ display: block;
+ margin-top: 4px;
+ font-size: 12px;
+ color: #888;
+}
+
+/* Error/success message */
+
+.feedback {
+ padding: 5px 20px;
+ color: #d9534f;
+ min-height: 25px;
+}
+
+/* Bottom input area */
+
+.message-area {
+ display: flex;
+ padding: 15px;
+ border-top: 1px solid #ccc;
+ background-color: #f5f5f5;
+ gap: 10px;
+}
+
+.message-area input {
+ flex: 1;
+ padding: 12px;
+ font-size: 16px;
+ border: 1px solid #bbb;
+ border-radius: 5px;
+}
+
+.message-area button {
+ padding: 12px 25px;
+ font-size: 16px;
+ background-color: #4a76a8;
+ color: white;
+ border: none;
+ border-radius: 5px;
+ cursor: pointer;
+}
+
+.message-area button:hover {
+ background-color: #365f8a;
+}
diff --git a/chat-app/mvnw b/chat-app/mvnw
new file mode 100644
index 00000000..bd8896bf
--- /dev/null
+++ b/chat-app/mvnw
@@ -0,0 +1,295 @@
+#!/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
+#
+# http://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.
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# Apache Maven Wrapper startup batch script, version 3.3.4
+#
+# Optional ENV vars
+# -----------------
+# JAVA_HOME - location of a JDK home dir, required when download maven via java source
+# MVNW_REPOURL - repo url base for downloading maven distribution
+# MVNW_USERNAME/MVNW_PASSWORD - user and password for downloading maven
+# MVNW_VERBOSE - true: enable verbose log; debug: trace the mvnw script; others: silence the output
+# ----------------------------------------------------------------------------
+
+set -euf
+[ "${MVNW_VERBOSE-}" != debug ] || set -x
+
+# OS specific support.
+native_path() { printf %s\\n "$1"; }
+case "$(uname)" in
+CYGWIN* | MINGW*)
+ [ -z "${JAVA_HOME-}" ] || JAVA_HOME="$(cygpath --unix "$JAVA_HOME")"
+ native_path() { cygpath --path --windows "$1"; }
+ ;;
+esac
+
+# set JAVACMD and JAVACCMD
+set_java_home() {
+ # For Cygwin and MinGW, ensure paths are in Unix format before anything is touched
+ if [ -n "${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"
+ JAVACCMD="$JAVA_HOME/jre/sh/javac"
+ else
+ JAVACMD="$JAVA_HOME/bin/java"
+ JAVACCMD="$JAVA_HOME/bin/javac"
+
+ if [ ! -x "$JAVACMD" ] || [ ! -x "$JAVACCMD" ]; then
+ echo "The JAVA_HOME environment variable is not defined correctly, so mvnw cannot run." >&2
+ echo "JAVA_HOME is set to \"$JAVA_HOME\", but \"\$JAVA_HOME/bin/java\" or \"\$JAVA_HOME/bin/javac\" does not exist." >&2
+ return 1
+ fi
+ fi
+ else
+ JAVACMD="$(
+ 'set' +e
+ 'unset' -f command 2>/dev/null
+ 'command' -v java
+ )" || :
+ JAVACCMD="$(
+ 'set' +e
+ 'unset' -f command 2>/dev/null
+ 'command' -v javac
+ )" || :
+
+ if [ ! -x "${JAVACMD-}" ] || [ ! -x "${JAVACCMD-}" ]; then
+ echo "The java/javac command does not exist in PATH nor is JAVA_HOME set, so mvnw cannot run." >&2
+ return 1
+ fi
+ fi
+}
+
+# hash string like Java String::hashCode
+hash_string() {
+ str="${1:-}" h=0
+ while [ -n "$str" ]; do
+ char="${str%"${str#?}"}"
+ h=$(((h * 31 + $(LC_CTYPE=C printf %d "'$char")) % 4294967296))
+ str="${str#?}"
+ done
+ printf %x\\n $h
+}
+
+verbose() { :; }
+[ "${MVNW_VERBOSE-}" != true ] || verbose() { printf %s\\n "${1-}"; }
+
+die() {
+ printf %s\\n "$1" >&2
+ exit 1
+}
+
+trim() {
+ # MWRAPPER-139:
+ # Trims trailing and leading whitespace, carriage returns, tabs, and linefeeds.
+ # Needed for removing poorly interpreted newline sequences when running in more
+ # exotic environments such as mingw bash on Windows.
+ printf "%s" "${1}" | tr -d '[:space:]'
+}
+
+scriptDir="$(dirname "$0")"
+scriptName="$(basename "$0")"
+
+# parse distributionUrl and optional distributionSha256Sum, requires .mvn/wrapper/maven-wrapper.properties
+while IFS="=" read -r key value; do
+ case "${key-}" in
+ distributionUrl) distributionUrl=$(trim "${value-}") ;;
+ distributionSha256Sum) distributionSha256Sum=$(trim "${value-}") ;;
+ esac
+done <"$scriptDir/.mvn/wrapper/maven-wrapper.properties"
+[ -n "${distributionUrl-}" ] || die "cannot read distributionUrl property in $scriptDir/.mvn/wrapper/maven-wrapper.properties"
+
+case "${distributionUrl##*/}" in
+maven-mvnd-*bin.*)
+ MVN_CMD=mvnd.sh _MVNW_REPO_PATTERN=/maven/mvnd/
+ case "${PROCESSOR_ARCHITECTURE-}${PROCESSOR_ARCHITEW6432-}:$(uname -a)" in
+ *AMD64:CYGWIN* | *AMD64:MINGW*) distributionPlatform=windows-amd64 ;;
+ :Darwin*x86_64) distributionPlatform=darwin-amd64 ;;
+ :Darwin*arm64) distributionPlatform=darwin-aarch64 ;;
+ :Linux*x86_64*) distributionPlatform=linux-amd64 ;;
+ *)
+ echo "Cannot detect native platform for mvnd on $(uname)-$(uname -m), use pure java version" >&2
+ distributionPlatform=linux-amd64
+ ;;
+ esac
+ distributionUrl="${distributionUrl%-bin.*}-$distributionPlatform.zip"
+ ;;
+maven-mvnd-*) MVN_CMD=mvnd.sh _MVNW_REPO_PATTERN=/maven/mvnd/ ;;
+*) MVN_CMD="mvn${scriptName#mvnw}" _MVNW_REPO_PATTERN=/org/apache/maven/ ;;
+esac
+
+# apply MVNW_REPOURL and calculate MAVEN_HOME
+# maven home pattern: ~/.m2/wrapper/dists/{apache-maven-,maven-mvnd--}/
+[ -z "${MVNW_REPOURL-}" ] || distributionUrl="$MVNW_REPOURL$_MVNW_REPO_PATTERN${distributionUrl#*"$_MVNW_REPO_PATTERN"}"
+distributionUrlName="${distributionUrl##*/}"
+distributionUrlNameMain="${distributionUrlName%.*}"
+distributionUrlNameMain="${distributionUrlNameMain%-bin}"
+MAVEN_USER_HOME="${MAVEN_USER_HOME:-${HOME}/.m2}"
+MAVEN_HOME="${MAVEN_USER_HOME}/wrapper/dists/${distributionUrlNameMain-}/$(hash_string "$distributionUrl")"
+
+exec_maven() {
+ unset MVNW_VERBOSE MVNW_USERNAME MVNW_PASSWORD MVNW_REPOURL || :
+ exec "$MAVEN_HOME/bin/$MVN_CMD" "$@" || die "cannot exec $MAVEN_HOME/bin/$MVN_CMD"
+}
+
+if [ -d "$MAVEN_HOME" ]; then
+ verbose "found existing MAVEN_HOME at $MAVEN_HOME"
+ exec_maven "$@"
+fi
+
+case "${distributionUrl-}" in
+*?-bin.zip | *?maven-mvnd-?*-?*.zip) ;;
+*) die "distributionUrl is not valid, must match *-bin.zip or maven-mvnd-*.zip, but found '${distributionUrl-}'" ;;
+esac
+
+# prepare tmp dir
+if TMP_DOWNLOAD_DIR="$(mktemp -d)" && [ -d "$TMP_DOWNLOAD_DIR" ]; then
+ clean() { rm -rf -- "$TMP_DOWNLOAD_DIR"; }
+ trap clean HUP INT TERM EXIT
+else
+ die "cannot create temp dir"
+fi
+
+mkdir -p -- "${MAVEN_HOME%/*}"
+
+# Download and Install Apache Maven
+verbose "Couldn't find MAVEN_HOME, downloading and installing it ..."
+verbose "Downloading from: $distributionUrl"
+verbose "Downloading to: $TMP_DOWNLOAD_DIR/$distributionUrlName"
+
+# select .zip or .tar.gz
+if ! command -v unzip >/dev/null; then
+ distributionUrl="${distributionUrl%.zip}.tar.gz"
+ distributionUrlName="${distributionUrl##*/}"
+fi
+
+# verbose opt
+__MVNW_QUIET_WGET=--quiet __MVNW_QUIET_CURL=--silent __MVNW_QUIET_UNZIP=-q __MVNW_QUIET_TAR=''
+[ "${MVNW_VERBOSE-}" != true ] || __MVNW_QUIET_WGET='' __MVNW_QUIET_CURL='' __MVNW_QUIET_UNZIP='' __MVNW_QUIET_TAR=v
+
+# normalize http auth
+case "${MVNW_PASSWORD:+has-password}" in
+'') MVNW_USERNAME='' MVNW_PASSWORD='' ;;
+has-password) [ -n "${MVNW_USERNAME-}" ] || MVNW_USERNAME='' MVNW_PASSWORD='' ;;
+esac
+
+if [ -z "${MVNW_USERNAME-}" ] && command -v wget >/dev/null; then
+ verbose "Found wget ... using wget"
+ wget ${__MVNW_QUIET_WGET:+"$__MVNW_QUIET_WGET"} "$distributionUrl" -O "$TMP_DOWNLOAD_DIR/$distributionUrlName" || die "wget: Failed to fetch $distributionUrl"
+elif [ -z "${MVNW_USERNAME-}" ] && command -v curl >/dev/null; then
+ verbose "Found curl ... using curl"
+ curl ${__MVNW_QUIET_CURL:+"$__MVNW_QUIET_CURL"} -f -L -o "$TMP_DOWNLOAD_DIR/$distributionUrlName" "$distributionUrl" || die "curl: Failed to fetch $distributionUrl"
+elif set_java_home; then
+ verbose "Falling back to use Java to download"
+ javaSource="$TMP_DOWNLOAD_DIR/Downloader.java"
+ targetZip="$TMP_DOWNLOAD_DIR/$distributionUrlName"
+ cat >"$javaSource" <<-END
+ public class Downloader extends java.net.Authenticator
+ {
+ protected java.net.PasswordAuthentication getPasswordAuthentication()
+ {
+ return new java.net.PasswordAuthentication( System.getenv( "MVNW_USERNAME" ), System.getenv( "MVNW_PASSWORD" ).toCharArray() );
+ }
+ public static void main( String[] args ) throws Exception
+ {
+ setDefault( new Downloader() );
+ java.nio.file.Files.copy( java.net.URI.create( args[0] ).toURL().openStream(), java.nio.file.Paths.get( args[1] ).toAbsolutePath().normalize() );
+ }
+ }
+ END
+ # For Cygwin/MinGW, switch paths to Windows format before running javac and java
+ verbose " - Compiling Downloader.java ..."
+ "$(native_path "$JAVACCMD")" "$(native_path "$javaSource")" || die "Failed to compile Downloader.java"
+ verbose " - Running Downloader.java ..."
+ "$(native_path "$JAVACMD")" -cp "$(native_path "$TMP_DOWNLOAD_DIR")" Downloader "$distributionUrl" "$(native_path "$targetZip")"
+fi
+
+# If specified, validate the SHA-256 sum of the Maven distribution zip file
+if [ -n "${distributionSha256Sum-}" ]; then
+ distributionSha256Result=false
+ if [ "$MVN_CMD" = mvnd.sh ]; then
+ echo "Checksum validation is not supported for maven-mvnd." >&2
+ echo "Please disable validation by removing 'distributionSha256Sum' from your maven-wrapper.properties." >&2
+ exit 1
+ elif command -v sha256sum >/dev/null; then
+ if echo "$distributionSha256Sum $TMP_DOWNLOAD_DIR/$distributionUrlName" | sha256sum -c - >/dev/null 2>&1; then
+ distributionSha256Result=true
+ fi
+ elif command -v shasum >/dev/null; then
+ if echo "$distributionSha256Sum $TMP_DOWNLOAD_DIR/$distributionUrlName" | shasum -a 256 -c >/dev/null 2>&1; then
+ distributionSha256Result=true
+ fi
+ else
+ echo "Checksum validation was requested but neither 'sha256sum' or 'shasum' are available." >&2
+ echo "Please install either command, or disable validation by removing 'distributionSha256Sum' from your maven-wrapper.properties." >&2
+ exit 1
+ fi
+ if [ $distributionSha256Result = false ]; then
+ echo "Error: Failed to validate Maven distribution SHA-256, your Maven distribution might be compromised." >&2
+ echo "If you updated your Maven version, you need to update the specified distributionSha256Sum property." >&2
+ exit 1
+ fi
+fi
+
+# unzip and move
+if command -v unzip >/dev/null; then
+ unzip ${__MVNW_QUIET_UNZIP:+"$__MVNW_QUIET_UNZIP"} "$TMP_DOWNLOAD_DIR/$distributionUrlName" -d "$TMP_DOWNLOAD_DIR" || die "failed to unzip"
+else
+ tar xzf${__MVNW_QUIET_TAR:+"$__MVNW_QUIET_TAR"} "$TMP_DOWNLOAD_DIR/$distributionUrlName" -C "$TMP_DOWNLOAD_DIR" || die "failed to untar"
+fi
+
+# Find the actual extracted directory name (handles snapshots where filename != directory name)
+actualDistributionDir=""
+
+# First try the expected directory name (for regular distributions)
+if [ -d "$TMP_DOWNLOAD_DIR/$distributionUrlNameMain" ]; then
+ if [ -f "$TMP_DOWNLOAD_DIR/$distributionUrlNameMain/bin/$MVN_CMD" ]; then
+ actualDistributionDir="$distributionUrlNameMain"
+ fi
+fi
+
+# If not found, search for any directory with the Maven executable (for snapshots)
+if [ -z "$actualDistributionDir" ]; then
+ # enable globbing to iterate over items
+ set +f
+ for dir in "$TMP_DOWNLOAD_DIR"/*; do
+ if [ -d "$dir" ]; then
+ if [ -f "$dir/bin/$MVN_CMD" ]; then
+ actualDistributionDir="$(basename "$dir")"
+ break
+ fi
+ fi
+ done
+ set -f
+fi
+
+if [ -z "$actualDistributionDir" ]; then
+ verbose "Contents of $TMP_DOWNLOAD_DIR:"
+ verbose "$(ls -la "$TMP_DOWNLOAD_DIR")"
+ die "Could not find Maven distribution directory in extracted archive"
+fi
+
+verbose "Found extracted Maven distribution directory: $actualDistributionDir"
+printf %s\\n "$distributionUrl" >"$TMP_DOWNLOAD_DIR/$actualDistributionDir/mvnw.url"
+mv -- "$TMP_DOWNLOAD_DIR/$actualDistributionDir" "$MAVEN_HOME" || [ -d "$MAVEN_HOME" ] || die "fail to move MAVEN_HOME"
+
+clean || :
+exec_maven "$@"
diff --git a/chat-app/mvnw.cmd b/chat-app/mvnw.cmd
new file mode 100644
index 00000000..92450f93
--- /dev/null
+++ b/chat-app/mvnw.cmd
@@ -0,0 +1,189 @@
+<# : batch portion
+@REM ----------------------------------------------------------------------------
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements. See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership. The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License. You may obtain a copy of the License at
+@REM
+@REM http://www.apache.org/licenses/LICENSE-2.0
+@REM
+@REM Unless required by applicable law or agreed to in writing,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied. See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+@REM ----------------------------------------------------------------------------
+
+@REM ----------------------------------------------------------------------------
+@REM Apache Maven Wrapper startup batch script, version 3.3.4
+@REM
+@REM Optional ENV vars
+@REM MVNW_REPOURL - repo url base for downloading maven distribution
+@REM MVNW_USERNAME/MVNW_PASSWORD - user and password for downloading maven
+@REM MVNW_VERBOSE - true: enable verbose log; others: silence the output
+@REM ----------------------------------------------------------------------------
+
+@IF "%__MVNW_ARG0_NAME__%"=="" (SET __MVNW_ARG0_NAME__=%~nx0)
+@SET __MVNW_CMD__=
+@SET __MVNW_ERROR__=
+@SET __MVNW_PSMODULEP_SAVE=%PSModulePath%
+@SET PSModulePath=
+@FOR /F "usebackq tokens=1* delims==" %%A IN (`powershell -noprofile "& {$scriptDir='%~dp0'; $script='%__MVNW_ARG0_NAME__%'; icm -ScriptBlock ([Scriptblock]::Create((Get-Content -Raw '%~f0'))) -NoNewScope}"`) DO @(
+ IF "%%A"=="MVN_CMD" (set __MVNW_CMD__=%%B) ELSE IF "%%B"=="" (echo %%A) ELSE (echo %%A=%%B)
+)
+@SET PSModulePath=%__MVNW_PSMODULEP_SAVE%
+@SET __MVNW_PSMODULEP_SAVE=
+@SET __MVNW_ARG0_NAME__=
+@SET MVNW_USERNAME=
+@SET MVNW_PASSWORD=
+@IF NOT "%__MVNW_CMD__%"=="" ("%__MVNW_CMD__%" %*)
+@echo Cannot start maven from wrapper >&2 && exit /b 1
+@GOTO :EOF
+: end batch / begin powershell #>
+
+$ErrorActionPreference = "Stop"
+if ($env:MVNW_VERBOSE -eq "true") {
+ $VerbosePreference = "Continue"
+}
+
+# calculate distributionUrl, requires .mvn/wrapper/maven-wrapper.properties
+$distributionUrl = (Get-Content -Raw "$scriptDir/.mvn/wrapper/maven-wrapper.properties" | ConvertFrom-StringData).distributionUrl
+if (!$distributionUrl) {
+ Write-Error "cannot read distributionUrl property in $scriptDir/.mvn/wrapper/maven-wrapper.properties"
+}
+
+switch -wildcard -casesensitive ( $($distributionUrl -replace '^.*/','') ) {
+ "maven-mvnd-*" {
+ $USE_MVND = $true
+ $distributionUrl = $distributionUrl -replace '-bin\.[^.]*$',"-windows-amd64.zip"
+ $MVN_CMD = "mvnd.cmd"
+ break
+ }
+ default {
+ $USE_MVND = $false
+ $MVN_CMD = $script -replace '^mvnw','mvn'
+ break
+ }
+}
+
+# apply MVNW_REPOURL and calculate MAVEN_HOME
+# maven home pattern: ~/.m2/wrapper/dists/{apache-maven-,maven-mvnd--}/
+if ($env:MVNW_REPOURL) {
+ $MVNW_REPO_PATTERN = if ($USE_MVND -eq $False) { "/org/apache/maven/" } else { "/maven/mvnd/" }
+ $distributionUrl = "$env:MVNW_REPOURL$MVNW_REPO_PATTERN$($distributionUrl -replace "^.*$MVNW_REPO_PATTERN",'')"
+}
+$distributionUrlName = $distributionUrl -replace '^.*/',''
+$distributionUrlNameMain = $distributionUrlName -replace '\.[^.]*$','' -replace '-bin$',''
+
+$MAVEN_M2_PATH = "$HOME/.m2"
+if ($env:MAVEN_USER_HOME) {
+ $MAVEN_M2_PATH = "$env:MAVEN_USER_HOME"
+}
+
+if (-not (Test-Path -Path $MAVEN_M2_PATH)) {
+ New-Item -Path $MAVEN_M2_PATH -ItemType Directory | Out-Null
+}
+
+$MAVEN_WRAPPER_DISTS = $null
+if ((Get-Item $MAVEN_M2_PATH).Target[0] -eq $null) {
+ $MAVEN_WRAPPER_DISTS = "$MAVEN_M2_PATH/wrapper/dists"
+} else {
+ $MAVEN_WRAPPER_DISTS = (Get-Item $MAVEN_M2_PATH).Target[0] + "/wrapper/dists"
+}
+
+$MAVEN_HOME_PARENT = "$MAVEN_WRAPPER_DISTS/$distributionUrlNameMain"
+$MAVEN_HOME_NAME = ([System.Security.Cryptography.SHA256]::Create().ComputeHash([byte[]][char[]]$distributionUrl) | ForEach-Object {$_.ToString("x2")}) -join ''
+$MAVEN_HOME = "$MAVEN_HOME_PARENT/$MAVEN_HOME_NAME"
+
+if (Test-Path -Path "$MAVEN_HOME" -PathType Container) {
+ Write-Verbose "found existing MAVEN_HOME at $MAVEN_HOME"
+ Write-Output "MVN_CMD=$MAVEN_HOME/bin/$MVN_CMD"
+ exit $?
+}
+
+if (! $distributionUrlNameMain -or ($distributionUrlName -eq $distributionUrlNameMain)) {
+ Write-Error "distributionUrl is not valid, must end with *-bin.zip, but found $distributionUrl"
+}
+
+# prepare tmp dir
+$TMP_DOWNLOAD_DIR_HOLDER = New-TemporaryFile
+$TMP_DOWNLOAD_DIR = New-Item -Itemtype Directory -Path "$TMP_DOWNLOAD_DIR_HOLDER.dir"
+$TMP_DOWNLOAD_DIR_HOLDER.Delete() | Out-Null
+trap {
+ if ($TMP_DOWNLOAD_DIR.Exists) {
+ try { Remove-Item $TMP_DOWNLOAD_DIR -Recurse -Force | Out-Null }
+ catch { Write-Warning "Cannot remove $TMP_DOWNLOAD_DIR" }
+ }
+}
+
+New-Item -Itemtype Directory -Path "$MAVEN_HOME_PARENT" -Force | Out-Null
+
+# Download and Install Apache Maven
+Write-Verbose "Couldn't find MAVEN_HOME, downloading and installing it ..."
+Write-Verbose "Downloading from: $distributionUrl"
+Write-Verbose "Downloading to: $TMP_DOWNLOAD_DIR/$distributionUrlName"
+
+$webclient = New-Object System.Net.WebClient
+if ($env:MVNW_USERNAME -and $env:MVNW_PASSWORD) {
+ $webclient.Credentials = New-Object System.Net.NetworkCredential($env:MVNW_USERNAME, $env:MVNW_PASSWORD)
+}
+[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
+$webclient.DownloadFile($distributionUrl, "$TMP_DOWNLOAD_DIR/$distributionUrlName") | Out-Null
+
+# If specified, validate the SHA-256 sum of the Maven distribution zip file
+$distributionSha256Sum = (Get-Content -Raw "$scriptDir/.mvn/wrapper/maven-wrapper.properties" | ConvertFrom-StringData).distributionSha256Sum
+if ($distributionSha256Sum) {
+ if ($USE_MVND) {
+ Write-Error "Checksum validation is not supported for maven-mvnd. `nPlease disable validation by removing 'distributionSha256Sum' from your maven-wrapper.properties."
+ }
+ Import-Module $PSHOME\Modules\Microsoft.PowerShell.Utility -Function Get-FileHash
+ if ((Get-FileHash "$TMP_DOWNLOAD_DIR/$distributionUrlName" -Algorithm SHA256).Hash.ToLower() -ne $distributionSha256Sum) {
+ Write-Error "Error: Failed to validate Maven distribution SHA-256, your Maven distribution might be compromised. If you updated your Maven version, you need to update the specified distributionSha256Sum property."
+ }
+}
+
+# unzip and move
+Expand-Archive "$TMP_DOWNLOAD_DIR/$distributionUrlName" -DestinationPath "$TMP_DOWNLOAD_DIR" | Out-Null
+
+# Find the actual extracted directory name (handles snapshots where filename != directory name)
+$actualDistributionDir = ""
+
+# First try the expected directory name (for regular distributions)
+$expectedPath = Join-Path "$TMP_DOWNLOAD_DIR" "$distributionUrlNameMain"
+$expectedMvnPath = Join-Path "$expectedPath" "bin/$MVN_CMD"
+if ((Test-Path -Path $expectedPath -PathType Container) -and (Test-Path -Path $expectedMvnPath -PathType Leaf)) {
+ $actualDistributionDir = $distributionUrlNameMain
+}
+
+# If not found, search for any directory with the Maven executable (for snapshots)
+if (!$actualDistributionDir) {
+ Get-ChildItem -Path "$TMP_DOWNLOAD_DIR" -Directory | ForEach-Object {
+ $testPath = Join-Path $_.FullName "bin/$MVN_CMD"
+ if (Test-Path -Path $testPath -PathType Leaf) {
+ $actualDistributionDir = $_.Name
+ }
+ }
+}
+
+if (!$actualDistributionDir) {
+ Write-Error "Could not find Maven distribution directory in extracted archive"
+}
+
+Write-Verbose "Found extracted Maven distribution directory: $actualDistributionDir"
+Rename-Item -Path "$TMP_DOWNLOAD_DIR/$actualDistributionDir" -NewName $MAVEN_HOME_NAME | Out-Null
+try {
+ Move-Item -Path "$TMP_DOWNLOAD_DIR/$MAVEN_HOME_NAME" -Destination $MAVEN_HOME_PARENT | Out-Null
+} catch {
+ if (! (Test-Path -Path "$MAVEN_HOME" -PathType Container)) {
+ Write-Error "fail to move MAVEN_HOME"
+ }
+} finally {
+ try { Remove-Item $TMP_DOWNLOAD_DIR -Recurse -Force | Out-Null }
+ catch { Write-Warning "Cannot remove $TMP_DOWNLOAD_DIR" }
+}
+
+Write-Output "MVN_CMD=$MAVEN_HOME/bin/$MVN_CMD"
diff --git a/chat-app/pom.xml b/chat-app/pom.xml
new file mode 100644
index 00000000..3280da7a
--- /dev/null
+++ b/chat-app/pom.xml
@@ -0,0 +1,88 @@
+
+
+ 4.0.0
+
+ org.springframework.boot
+ spring-boot-starter-parent
+ 4.1.1
+
+
+ com.shaghayegh
+ chat_app
+ 0.0.1-SNAPSHOT
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ 26
+
+
+
+ org.springframework.boot
+ spring-boot-starter
+
+
+
+ org.springframework.boot
+ spring-boot-starter-test
+ test
+
+
+
+
+ org.springframework.boot
+ spring-boot-starter-security
+
+
+
+
+
+
+ org.springframework.boot
+ spring-boot-starter-web
+
+
+
+
+ org.springframework.boot
+ spring-boot-starter-data-jpa
+
+
+
+
+ org.postgresql
+ postgresql
+ runtime
+
+
+
+
+ org.springframework.boot
+ spring-boot-starter-validation
+
+
+
+
+
+
+
+ org.springframework.boot
+ spring-boot-maven-plugin
+
+
+
+
+
diff --git a/chat-app/src/main/java/com/shaghayegh/chat_app/ChatAppApplication.java b/chat-app/src/main/java/com/shaghayegh/chat_app/ChatAppApplication.java
new file mode 100644
index 00000000..a98d1283
--- /dev/null
+++ b/chat-app/src/main/java/com/shaghayegh/chat_app/ChatAppApplication.java
@@ -0,0 +1,13 @@
+package com.shaghayegh.chat_app;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class ChatAppApplication {
+
+ public static void main(String[] args) {
+ SpringApplication.run(ChatAppApplication.class, args);
+ }
+
+}
diff --git a/chat-app/src/main/java/com/shaghayegh/chat_app/config/SecurityConfig.java b/chat-app/src/main/java/com/shaghayegh/chat_app/config/SecurityConfig.java
new file mode 100644
index 00000000..99c55b78
--- /dev/null
+++ b/chat-app/src/main/java/com/shaghayegh/chat_app/config/SecurityConfig.java
@@ -0,0 +1,30 @@
+package com.shaghayegh.chat_app.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.security.web.SecurityFilterChain;
+
+@Configuration
+public class SecurityConfig {
+
+ @Bean
+ public PasswordEncoder passwordEncoder() {
+ return new BCryptPasswordEncoder();
+ }
+
+ @Bean
+ public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
+
+ http
+ .csrf(csrf -> csrf.disable())
+ .authorizeHttpRequests(auth -> auth
+ .requestMatchers("/messages").permitAll()
+ .anyRequest().authenticated()
+ );
+
+ return http.build();
+ }
+}
\ No newline at end of file
diff --git a/chat-app/src/main/java/com/shaghayegh/chat_app/controller/MessageController.java b/chat-app/src/main/java/com/shaghayegh/chat_app/controller/MessageController.java
new file mode 100644
index 00000000..7fdcf2df
--- /dev/null
+++ b/chat-app/src/main/java/com/shaghayegh/chat_app/controller/MessageController.java
@@ -0,0 +1,35 @@
+package com.shaghayegh.chat_app.controller;
+
+import com.shaghayegh.chat_app.model.Message;
+import com.shaghayegh.chat_app.service.MessageService;
+import jakarta.validation.Valid;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.*;
+
+
+import java.util.List;
+
+@RestController
+@CrossOrigin(origins= "http://localhost:63342")
+public class MessageController {
+
+ private final MessageService messageService;
+
+ public MessageController(MessageService messageService) {
+ this.messageService = messageService;
+ }
+
+ @GetMapping("/messages")
+ public List getMessages() {
+ return messageService.getAllMessages();
+ }
+
+
+ @PostMapping("/messages")
+ public Message createMessage(
+ @Valid @RequestBody Message message,
+ @RequestParam String username) {
+
+ return messageService.createMessage(message, username);
+ }
+}
\ No newline at end of file
diff --git a/chat-app/src/main/java/com/shaghayegh/chat_app/controller/UserController.java b/chat-app/src/main/java/com/shaghayegh/chat_app/controller/UserController.java
new file mode 100644
index 00000000..762a8188
--- /dev/null
+++ b/chat-app/src/main/java/com/shaghayegh/chat_app/controller/UserController.java
@@ -0,0 +1,27 @@
+package com.shaghayegh.chat_app.controller;
+
+import com.shaghayegh.chat_app.model.User;
+import com.shaghayegh.chat_app.service.UserService;
+import jakarta.validation.Valid;
+import org.springframework.web.bind.annotation.CrossOrigin;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@CrossOrigin(origins="http://localhost:63342")
+public class UserController {
+
+
+ private final UserService userService;
+
+ public UserController(UserService userService) {
+ this.userService = userService;
+ }
+
+ @PostMapping("/users")
+ public User createUser(@Valid @RequestBody User user){
+ return userService.createUser(user);
+
+ }
+}
diff --git a/chat-app/src/main/java/com/shaghayegh/chat_app/model/Message.java b/chat-app/src/main/java/com/shaghayegh/chat_app/model/Message.java
new file mode 100644
index 00000000..2298ec79
--- /dev/null
+++ b/chat-app/src/main/java/com/shaghayegh/chat_app/model/Message.java
@@ -0,0 +1,55 @@
+package com.shaghayegh.chat_app.model;
+
+import jakarta.persistence.*;
+import jakarta.validation.constraints.NotBlank;
+
+import java.time.LocalDateTime;
+
+@Entity
+@Table(name = "messages")
+public class Message {
+
+ @Id
+ @GeneratedValue
+ private Long id;
+
+ @NotBlank
+ private String content;
+
+ @ManyToOne
+ @JoinColumn(name = "user_id")
+ private User user;
+
+ private LocalDateTime createdAt;
+
+ public Message() {
+ }
+
+ public Long getId() {
+ return id;
+ }
+
+ public String getContent() {
+ return content;
+ }
+
+ public void setContent(String content) {
+ this.content = content;
+ }
+
+ public User getUser() {
+ return user;
+ }
+
+ public void setUser(User user) {
+ this.user = user;
+ }
+
+ public LocalDateTime getCreatedAt() {
+ return createdAt;
+ }
+
+ public void setCreatedAt(LocalDateTime createdAt) {
+ this.createdAt = createdAt;
+ }
+}
\ No newline at end of file
diff --git a/chat-app/src/main/java/com/shaghayegh/chat_app/model/User.java b/chat-app/src/main/java/com/shaghayegh/chat_app/model/User.java
new file mode 100644
index 00000000..884c394c
--- /dev/null
+++ b/chat-app/src/main/java/com/shaghayegh/chat_app/model/User.java
@@ -0,0 +1,33 @@
+package com.shaghayegh.chat_app.model;
+
+import jakarta.persistence.*;
+import jakarta.validation.constraints.NotBlank;
+
+@Entity
+@Table(name = "users")
+public class User {
+
+ @Id
+ @GeneratedValue
+ private Long userId;
+
+ @NotBlank
+ private String username;
+
+
+ public User() {
+ }
+
+ public Long getUserId() {
+ return userId;
+ }
+
+ public String getUsername() {
+ return username;
+ }
+
+ public void setUsername(String username) {
+ this.username = username;
+ }
+
+}
\ No newline at end of file
diff --git a/chat-app/src/main/java/com/shaghayegh/chat_app/repository/MessageRepository.java b/chat-app/src/main/java/com/shaghayegh/chat_app/repository/MessageRepository.java
new file mode 100644
index 00000000..c7cd6893
--- /dev/null
+++ b/chat-app/src/main/java/com/shaghayegh/chat_app/repository/MessageRepository.java
@@ -0,0 +1,6 @@
+package com.shaghayegh.chat_app.repository;
+import com.shaghayegh.chat_app.model.Message;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface MessageRepository extends JpaRepository {
+}
diff --git a/chat-app/src/main/java/com/shaghayegh/chat_app/repository/UserRepository.java b/chat-app/src/main/java/com/shaghayegh/chat_app/repository/UserRepository.java
new file mode 100644
index 00000000..9198f2fd
--- /dev/null
+++ b/chat-app/src/main/java/com/shaghayegh/chat_app/repository/UserRepository.java
@@ -0,0 +1,11 @@
+package com.shaghayegh.chat_app.repository;
+
+import com.shaghayegh.chat_app.model.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface UserRepository extends JpaRepository {
+
+ Optional findByUsername(String username);
+}
\ No newline at end of file
diff --git a/chat-app/src/main/java/com/shaghayegh/chat_app/service/MessageService.java b/chat-app/src/main/java/com/shaghayegh/chat_app/service/MessageService.java
new file mode 100644
index 00000000..43616c6c
--- /dev/null
+++ b/chat-app/src/main/java/com/shaghayegh/chat_app/service/MessageService.java
@@ -0,0 +1,38 @@
+package com.shaghayegh.chat_app.service;
+
+import com.shaghayegh.chat_app.model.Message;
+import com.shaghayegh.chat_app.model.User;
+import com.shaghayegh.chat_app.repository.MessageRepository;
+import org.springframework.stereotype.Service;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+@Service
+public class MessageService {
+
+ private final MessageRepository messageRepository;
+ private final UserService userService;
+
+ public MessageService(
+ MessageRepository messageRepository,
+ UserService userService) {
+
+ this.messageRepository = messageRepository;
+ this.userService = userService;
+ }
+
+ public List getAllMessages() {
+ return messageRepository.findAll();
+ }
+
+ public Message createMessage(Message message, String username) {
+
+ User user = userService.findOrCreateUser(username);
+
+ message.setUser(user);
+ message.setCreatedAt(LocalDateTime.now());
+
+ return messageRepository.save(message);
+ }
+}
\ No newline at end of file
diff --git a/chat-app/src/main/java/com/shaghayegh/chat_app/service/UserService.java b/chat-app/src/main/java/com/shaghayegh/chat_app/service/UserService.java
new file mode 100644
index 00000000..e549745c
--- /dev/null
+++ b/chat-app/src/main/java/com/shaghayegh/chat_app/service/UserService.java
@@ -0,0 +1,34 @@
+package com.shaghayegh.chat_app.service;
+
+import com.shaghayegh.chat_app.model.User;
+import com.shaghayegh.chat_app.repository.UserRepository;
+import org.springframework.stereotype.Service;
+
+import java.util.Optional;
+
+@Service
+public class UserService {
+
+ private final UserRepository userRepository;
+
+ public UserService(UserRepository userRepository) {
+ this.userRepository = userRepository;
+ }
+
+ public User createUser(User user) {
+ return userRepository.save(user);
+ }
+
+ public User findOrCreateUser(String username) {
+ Optional existingUser = userRepository.findByUsername(username);
+
+ if (existingUser.isPresent()) {
+ return existingUser.get();
+ }
+
+ User newUser = new User();
+ newUser.setUsername(username);
+
+ return userRepository.save(newUser);
+ }
+}
\ No newline at end of file
diff --git a/chat-app/src/main/resources/application.properties b/chat-app/src/main/resources/application.properties
new file mode 100644
index 00000000..caf5778a
--- /dev/null
+++ b/chat-app/src/main/resources/application.properties
@@ -0,0 +1,10 @@
+spring.application.name=chat_app
+
+server.port=8081
+
+spring.datasource.url=jdbc:postgresql://localhost:5432/chat_app
+spring.datasource.username=postgres
+spring.datasource.password=123
+
+spring.jpa.hibernate.ddl-auto=update
+spring.jpa.show-sql=true
\ No newline at end of file
diff --git a/chat-app/src/test/java/com/shaghayegh/chat_app/ChatAppApplicationTests.java b/chat-app/src/test/java/com/shaghayegh/chat_app/ChatAppApplicationTests.java
new file mode 100644
index 00000000..518405e4
--- /dev/null
+++ b/chat-app/src/test/java/com/shaghayegh/chat_app/ChatAppApplicationTests.java
@@ -0,0 +1,13 @@
+package com.shaghayegh.chat_app;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class ChatAppApplicationTests {
+
+ @Test
+ void contextLoads() {
+ }
+
+}