Auth api completed

2026-08-22 10:31:09 +05:30
commit 3d5b148f4c
25 changed files with 1463 additions and 0 deletions
--- a/.idea/.gitignore
+++ b/.idea/.gitignore
@@ -0,0 +1,10 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Ignored default folder with query files
+/queries/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
--- a/.idea/kafm-backend.iml
+++ b/.idea/kafm-backend.iml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" project-jdk-name="17" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
--- a/.idea/modules.xml
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/kafm-backend.iml" filepath="$PROJECT_DIR$/.idea/kafm-backend.iml" />
+    </modules>
+  </component>
+</project>
--- a/.idea/vcs.xml
+++ b/.idea/vcs.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/kafm-backend" vcs="Git" />
+  </component>
+</project>
--- a/kafm-backend/.gitattributes
+++ b/kafm-backend/.gitattributes
@@ -0,0 +1,2 @@
+/mvnw text eol=lf
+*.cmd text eol=crlf
--- a/kafm-backend/.gitignore
+++ b/kafm-backend/.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/
--- a/kafm-backend/.mvn/wrapper/maven-wrapper.properties
+++ b/kafm-backend/.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
--- a/kafm-backend/mvnw
+++ b/kafm-backend/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${scriptName#mvnw}" _MVNW_REPO_PATTERN=/org/apache/maven/ ;;
+esac
+
+# apply MVNW_REPOURL and calculate MAVEN_HOME
+# maven home pattern: ~/.m2/wrapper/dists/{apache-maven-<version>,maven-mvnd-<version>-<platform>}/<hash>
+[ -z "${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 "$@"
--- a/kafm-backend/mvnw.cmd
+++ b/kafm-backend/mvnw.cmd
@@ -0,0 +1,189 @@
+<# : batch portion
+@REM ----------------------------------------------------------------------------
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements.  See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership.  The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License.  You may obtain a copy of the License at
+@REM
+@REM    http://www.apache.org/licenses/LICENSE-2.0
+@REM
+@REM Unless required by applicable law or agreed to in writing,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied.  See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+@REM ----------------------------------------------------------------------------
+
+@REM ----------------------------------------------------------------------------
+@REM Apache Maven Wrapper startup batch script, version 3.3.4
+@REM
+@REM Optional ENV vars
+@REM   MVNW_REPOURL - repo url base for downloading maven distribution
+@REM   MVNW_USERNAME/MVNW_PASSWORD - user and password for downloading maven
+@REM   MVNW_VERBOSE - true: enable verbose log; others: silence the output
+@REM ----------------------------------------------------------------------------
+
+@IF "%__MVNW_ARG0_NAME__%"=="" (SET __MVNW_ARG0_NAME__=%~nx0)
+@SET __MVNW_CMD__=
+@SET __MVNW_ERROR__=
+@SET __MVNW_PSMODULEP_SAVE=%PSModulePath%
+@SET PSModulePath=
+@FOR /F "usebackq tokens=1* delims==" %%A IN (`powershell -noprofile "& {$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 = $script -replace '^mvnw','mvn'
+    break
+  }
+}
+
+# apply MVNW_REPOURL and calculate MAVEN_HOME
+# maven home pattern: ~/.m2/wrapper/dists/{apache-maven-<version>,maven-mvnd-<version>-<platform>}/<hash>
+if ($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"
--- a/kafm-backend/pom.xml
+++ b/kafm-backend/pom.xml
@@ -0,0 +1,104 @@
+<?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>3.5.3</version>
+		<relativePath/>
+	</parent>
+
+	<groupId>com.example</groupId>
+	<artifactId>auth-system</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+
+	<properties>
+		<java.version>17</java.version>
+	</properties>
+
+	<dependencies>
+
+		<!-- REST API -->
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+
+		<!-- Spring Security -->
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-security</artifactId>
+		</dependency>
+
+		<!-- MongoDB -->
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-mongodb</artifactId>
+		</dependency>
+
+		<!-- Validation -->
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-validation</artifactId>
+		</dependency>
+
+		<!-- JWT -->
+		<dependency>
+			<groupId>io.jsonwebtoken</groupId>
+			<artifactId>jjwt-api</artifactId>
+			<version>0.12.6</version>
+		</dependency>
+
+		<dependency>
+			<groupId>io.jsonwebtoken</groupId>
+			<artifactId>jjwt-impl</artifactId>
+			<version>0.12.6</version>
+			<scope>runtime</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>io.jsonwebtoken</groupId>
+			<artifactId>jjwt-jackson</artifactId>
+			<version>0.12.6</version>
+			<scope>runtime</scope>
+		</dependency>
+
+		<!-- TOTP / Authenticator -->
+		<dependency>
+			<groupId>dev.samstevens.totp</groupId>
+			<artifactId>totp</artifactId>
+			<version>1.7.1</version>
+		</dependency>
+
+		<!-- Lombok - optional -->
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</artifactId>
+			<optional>true</optional>
+		</dependency>
+
+		<!-- Testing -->
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>
--- a/kafm-backend/src/main/java/com/example/kafm_backend/KafmBackendApplication.java
+++ b/kafm-backend/src/main/java/com/example/kafm_backend/KafmBackendApplication.java
@@ -0,0 +1,14 @@
+package com.example.kafm_backend;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class KafmBackendApplication {
+
+	public static void main(String[] args) {
+
+		SpringApplication.run(KafmBackendApplication.class, args);
+	}
+
+}
--- a/kafm-backend/src/main/java/com/example/kafm_backend/config/SecurityConfig.java
+++ b/kafm-backend/src/main/java/com/example/kafm_backend/config/SecurityConfig.java
@@ -0,0 +1,67 @@
+package com.example.kafm_backend.config;
+
+import com.example.kafm_backend.security.JwtAuthenticationFilter;
+
+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.config.annotation.web.configuration.EnableWebSecurity;
+import org.springframework.security.config.http.SessionCreationPolicy;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.security.web.SecurityFilterChain;
+import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
+
+@Configuration
+@EnableWebSecurity
+public class SecurityConfig {
+
+    private final JwtAuthenticationFilter jwtAuthenticationFilter;
+
+    public SecurityConfig(
+            JwtAuthenticationFilter jwtAuthenticationFilter) {
+
+        this.jwtAuthenticationFilter = jwtAuthenticationFilter;
+    }
+
+    @Bean
+    public PasswordEncoder passwordEncoder() {
+        return new BCryptPasswordEncoder();
+    }
+
+    @Bean
+    public SecurityFilterChain securityFilterChain(
+            HttpSecurity http) throws Exception {
+
+        http
+                // Disable CSRF because we are using JWT
+                .csrf(csrf -> csrf.disable())
+
+                // Disable CORS temporarily while testing Postman
+                .cors(cors -> cors.disable())
+
+                // JWT authentication = stateless
+                .sessionManagement(session ->
+                        session.sessionCreationPolicy(
+                                SessionCreationPolicy.STATELESS
+                        )
+                )
+
+                .authorizeHttpRequests(auth -> auth
+                        .requestMatchers(
+                                "/api/auth/login",
+                                "/api/auth/verify-login-2fa"
+                        ).permitAll()
+
+                        .anyRequest().authenticated()
+                )
+
+                // Check JWT before Spring's username/password filter
+                .addFilterBefore(
+                        jwtAuthenticationFilter,
+                        UsernamePasswordAuthenticationFilter.class
+                );
+
+        return http.build();
+    }
+}
--- a/kafm-backend/src/main/java/com/example/kafm_backend/config/TotpConfig.java
+++ b/kafm-backend/src/main/java/com/example/kafm_backend/config/TotpConfig.java
@@ -0,0 +1,50 @@
+package com.example.kafm_backend.config;
+
+import dev.samstevens.totp.code.CodeGenerator;
+import dev.samstevens.totp.code.CodeVerifier;
+import dev.samstevens.totp.code.DefaultCodeGenerator;
+import dev.samstevens.totp.code.DefaultCodeVerifier;
+import dev.samstevens.totp.qr.QrGenerator;
+import dev.samstevens.totp.qr.ZxingPngQrGenerator;
+import dev.samstevens.totp.secret.DefaultSecretGenerator;
+import dev.samstevens.totp.secret.SecretGenerator;
+import dev.samstevens.totp.time.SystemTimeProvider;
+import dev.samstevens.totp.time.TimeProvider;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class TotpConfig {
+
+    @Bean
+    public SecretGenerator secretGenerator() {
+        return new DefaultSecretGenerator();
+    }
+
+    @Bean
+    public CodeGenerator codeGenerator() {
+        return new DefaultCodeGenerator();
+    }
+
+    @Bean
+    public TimeProvider timeProvider() {
+        return new SystemTimeProvider();
+    }
+
+    @Bean
+    public CodeVerifier codeVerifier(
+            CodeGenerator codeGenerator,
+            TimeProvider timeProvider) {
+
+        return new DefaultCodeVerifier(
+                codeGenerator,
+                timeProvider
+        );
+    }
+
+    @Bean
+    public QrGenerator qrGenerator() {
+        return new ZxingPngQrGenerator();
+    }
+}
--- a/kafm-backend/src/main/java/com/example/kafm_backend/controller/AuthController.java
+++ b/kafm-backend/src/main/java/com/example/kafm_backend/controller/AuthController.java
@@ -0,0 +1,45 @@
+package com.example.kafm_backend.controller;
+
+import com.example.kafm_backend.dto.LoginRequest;
+import com.example.kafm_backend.dto.Verify2FARequest;
+import com.example.kafm_backend.dto.AuthResponse;
+import com.example.kafm_backend.service.AuthService;
+
+import jakarta.validation.Valid;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequestMapping("/api/auth")
+@CrossOrigin(origins = "*")
+public class AuthController {
+
+    private final AuthService authService;
+
+    public AuthController(AuthService authService) {
+        this.authService = authService;
+    }
+
+
+
+    @PostMapping("/login")
+    public ResponseEntity<AuthResponse> login(
+            @Valid @RequestBody LoginRequest request) {
+
+        return ResponseEntity.ok(
+                authService.login(request)
+        );
+    }
+
+
+
+    @PostMapping("/verify-login-2fa")
+    public ResponseEntity<AuthResponse> verifyLogin2FA(
+            @Valid @RequestBody Verify2FARequest request) {
+
+        return ResponseEntity.ok(
+                authService.verifyLogin2FA(request)
+        );
+    }
+}
--- a/kafm-backend/src/main/java/com/example/kafm_backend/dto/AuthResponse.java
+++ b/kafm-backend/src/main/java/com/example/kafm_backend/dto/AuthResponse.java
@@ -0,0 +1,77 @@
+package com.example.kafm_backend.dto;
+
+public class AuthResponse {
+
+    private boolean success;
+
+    private boolean isAuthenticated;
+
+    private boolean requiresTwoFactor;
+
+    private boolean requiresTwoFactorSetup;
+
+    private String message;
+
+    private String token;
+
+    private String qrCode;
+
+    public AuthResponse() {
+    }
+
+    public boolean isSuccess() {
+        return success;
+    }
+
+    public void setSuccess(boolean success) {
+        this.success = success;
+    }
+
+    public boolean isAuthenticated() {
+        return isAuthenticated;
+    }
+
+    public void setAuthenticated(boolean authenticated) {
+        isAuthenticated = authenticated;
+    }
+
+    public boolean isRequiresTwoFactor() {
+        return requiresTwoFactor;
+    }
+
+    public void setRequiresTwoFactor(boolean requiresTwoFactor) {
+        this.requiresTwoFactor = requiresTwoFactor;
+    }
+
+    public boolean isRequiresTwoFactorSetup() {
+        return requiresTwoFactorSetup;
+    }
+
+    public void setRequiresTwoFactorSetup(boolean requiresTwoFactorSetup) {
+        this.requiresTwoFactorSetup = requiresTwoFactorSetup;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public void setMessage(String message) {
+        this.message = message;
+    }
+
+    public String getToken() {
+        return token;
+    }
+
+    public void setToken(String token) {
+        this.token = token;
+    }
+
+    public String getQrCode() {
+        return qrCode;
+    }
+
+    public void setQrCode(String qrCode) {
+        this.qrCode = qrCode;
+    }
+}
--- a/kafm-backend/src/main/java/com/example/kafm_backend/dto/LoginRequest.java
+++ b/kafm-backend/src/main/java/com/example/kafm_backend/dto/LoginRequest.java
@@ -0,0 +1,30 @@
+package com.example.kafm_backend.dto;
+
+import jakarta.validation.constraints.Email;
+import jakarta.validation.constraints.NotBlank;
+
+public class LoginRequest {
+
+    @Email
+    @NotBlank
+    private String email;
+
+    @NotBlank
+    private String password;
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+}
--- a/kafm-backend/src/main/java/com/example/kafm_backend/dto/Verify2FARequest.java
+++ b/kafm-backend/src/main/java/com/example/kafm_backend/dto/Verify2FARequest.java
@@ -0,0 +1,30 @@
+package com.example.kafm_backend.dto;
+
+import jakarta.validation.constraints.Email;
+import jakarta.validation.constraints.NotBlank;
+
+public class Verify2FARequest {
+
+    @Email
+    @NotBlank
+    private String email;
+
+    @NotBlank
+    private String code;
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    public String getCode() {
+        return code;
+    }
+
+    public void setCode(String code) {
+        this.code = code;
+    }
+}
--- a/kafm-backend/src/main/java/com/example/kafm_backend/model/User.java
+++ b/kafm-backend/src/main/java/com/example/kafm_backend/model/User.java
@@ -0,0 +1,76 @@
+package com.example.kafm_backend.model;
+
+import org.springframework.data.annotation.Id;
+import org.springframework.data.mongodb.core.index.Indexed;
+import org.springframework.data.mongodb.core.mapping.Document;
+
+@Document(collection = "users")
+public class User {
+
+    @Id
+    private String id;
+
+    @Indexed(unique = true)
+    private String email;
+
+    private String password;
+
+    private boolean twoFactorEnabled;
+
+    private String twoFactorSecret;
+
+    public User() {
+    }
+
+    public User(
+            String email,
+            String password,
+            boolean twoFactorEnabled,
+            String twoFactorSecret) {
+
+        this.email = email;
+        this.password = password;
+        this.twoFactorEnabled = twoFactorEnabled;
+        this.twoFactorSecret = twoFactorSecret;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public boolean isTwoFactorEnabled() {
+        return twoFactorEnabled;
+    }
+
+    public void setTwoFactorEnabled(boolean twoFactorEnabled) {
+        this.twoFactorEnabled = twoFactorEnabled;
+    }
+
+    public String getTwoFactorSecret() {
+        return twoFactorSecret;
+    }
+
+    public void setTwoFactorSecret(String twoFactorSecret) {
+        this.twoFactorSecret = twoFactorSecret;
+    }
+}
--- a/kafm-backend/src/main/java/com/example/kafm_backend/repository/UserRepository.java
+++ b/kafm-backend/src/main/java/com/example/kafm_backend/repository/UserRepository.java
@@ -0,0 +1,13 @@
+package com.example.kafm_backend.repository;
+
+import com.example.kafm_backend.model.User;
+import org.springframework.data.mongodb.repository.MongoRepository;
+
+import java.util.Optional;
+
+public interface UserRepository extends MongoRepository<User, String> {
+
+    Optional<User> findByEmail(String email);
+
+    boolean existsByEmail(String email);
+}
--- a/kafm-backend/src/main/java/com/example/kafm_backend/security/JwtAuthenticationFilter.java
+++ b/kafm-backend/src/main/java/com/example/kafm_backend/security/JwtAuthenticationFilter.java
@@ -0,0 +1,104 @@
+package com.example.kafm_backend.security;
+
+import com.example.kafm_backend.repository.UserRepository;
+import jakarta.servlet.FilterChain;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.security.core.userdetails.User;
+import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
+import org.springframework.stereotype.Component;
+import org.springframework.web.filter.OncePerRequestFilter;
+
+import java.io.IOException;
+import java.util.Collections;
+
+@Component
+public class JwtAuthenticationFilter
+        extends OncePerRequestFilter {
+
+    private final JwtService jwtService;
+    private final UserRepository userRepository;
+
+    public JwtAuthenticationFilter(
+            JwtService jwtService,
+            UserRepository userRepository) {
+
+        this.jwtService = jwtService;
+        this.userRepository = userRepository;
+    }
+
+    @Override
+    protected void doFilterInternal(
+            HttpServletRequest request,
+            HttpServletResponse response,
+            FilterChain filterChain)
+            throws ServletException, IOException {
+
+        String authHeader = request.getHeader("Authorization");
+
+        // No JWT → continue normally
+        if (authHeader == null ||
+                !authHeader.startsWith("Bearer ")) {
+
+            filterChain.doFilter(request, response);
+            return;
+        }
+
+        String token = authHeader.substring(7);
+
+        // Invalid JWT → continue without authentication
+        if (!jwtService.isTokenValid(token)) {
+
+            filterChain.doFilter(request, response);
+            return;
+        }
+
+        String email = jwtService.extractEmail(token);
+
+        if (email == null || email.isBlank()) {
+            filterChain.doFilter(request, response);
+            return;
+        }
+
+        // Don't overwrite an existing authentication
+        if (SecurityContextHolder
+                .getContext()
+                .getAuthentication() != null) {
+
+            filterChain.doFilter(request, response);
+            return;
+        }
+
+        var userOptional = userRepository.findByEmail(email);
+
+        if (userOptional.isPresent()) {
+
+            User springUser = new User(
+                    email,
+                    "",
+                    Collections.emptyList()
+            );
+
+            UsernamePasswordAuthenticationToken authentication =
+                    new UsernamePasswordAuthenticationToken(
+                            springUser,
+                            null,
+                            springUser.getAuthorities()
+                    );
+
+            authentication.setDetails(
+                    new WebAuthenticationDetailsSource()
+                            .buildDetails(request)
+            );
+
+            SecurityContextHolder
+                    .getContext()
+                    .setAuthentication(authentication);
+        }
+
+        filterChain.doFilter(request, response);
+    }
+}
--- a/kafm-backend/src/main/java/com/example/kafm_backend/security/JwtService.java
+++ b/kafm-backend/src/main/java/com/example/kafm_backend/security/JwtService.java
@@ -0,0 +1,97 @@
+package com.example.kafm_backend.security;
+
+import io.jsonwebtoken.Claims;
+import io.jsonwebtoken.Jwts;
+import io.jsonwebtoken.io.Decoders;
+import io.jsonwebtoken.security.Keys;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+
+import javax.crypto.SecretKey;
+import java.util.Date;
+
+@Service
+public class JwtService {
+
+    private final SecretKey secretKey;
+    private final long expiration;
+
+    public JwtService(
+            @Value("${jwt.secret}") String secret,
+            @Value("${jwt.expiration}") long expiration) {
+
+        this.secretKey = Keys.hmacShaKeyFor(
+                Decoders.BASE64.decode(secret)
+        );
+
+        this.expiration = expiration;
+    }
+
+    /**
+     * Generate JWT after complete authentication.
+     *
+     * The JWT should only be generated after:
+     * 1. Email/password is correct
+     * 2. If 2FA is enabled, Authenticator code is correct
+     */
+    public String generateToken(String email) {
+
+        Date now = new Date();
+
+        Date expiryDate =
+                new Date(now.getTime() + expiration);
+
+        return Jwts.builder()
+                .subject(email)
+                .issuedAt(now)
+                .expiration(expiryDate)
+                .signWith(secretKey)
+                .compact();
+    }
+
+    /**
+     * Extract email from JWT.
+     */
+    public String extractEmail(String token) {
+
+        try {
+            return getClaims(token).getSubject();
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    /**
+     * Check whether JWT is valid and not expired.
+     */
+    public boolean isTokenValid(String token) {
+
+        try {
+
+            Claims claims = getClaims(token);
+
+            String email = claims.getSubject();
+
+            return email != null
+                    && !email.isBlank()
+                    && claims.getExpiration() != null
+                    && claims.getExpiration().after(new Date());
+
+        } catch (Exception e) {
+
+            return false;
+        }
+    }
+
+    /**
+     * Parse and verify JWT.
+     */
+    private Claims getClaims(String token) {
+
+        return Jwts.parser()
+                .verifyWith(secretKey)
+                .build()
+                .parseSignedClaims(token)
+                .getPayload();
+    }
+}
--- a/kafm-backend/src/main/java/com/example/kafm_backend/service/AuthService.java
+++ b/kafm-backend/src/main/java/com/example/kafm_backend/service/AuthService.java
@@ -0,0 +1,172 @@
+package com.example.kafm_backend.service;
+
+import com.example.kafm_backend.dto.AuthResponse;
+import com.example.kafm_backend.dto.LoginRequest;
+import com.example.kafm_backend.dto.Verify2FARequest;
+import com.example.kafm_backend.model.User;
+import com.example.kafm_backend.repository.UserRepository;
+import com.example.kafm_backend.security.JwtService;
+
+import dev.samstevens.totp.code.CodeVerifier;
+import dev.samstevens.totp.secret.SecretGenerator;
+import dev.samstevens.totp.qr.QrData;
+import dev.samstevens.totp.qr.QrGenerator;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.stereotype.Service;
+import org.springframework.web.server.ResponseStatusException;
+
+import java.util.Base64;
+import java.util.Optional;
+
+import static dev.samstevens.totp.qr.QrData.Builder;
+
+@Service
+public class AuthService {
+
+    private final UserRepository userRepository;
+    private final PasswordEncoder passwordEncoder;
+    private final JwtService jwtService;
+
+    private final SecretGenerator secretGenerator;
+    private final QrGenerator qrGenerator;
+    private final CodeVerifier codeVerifier;
+
+    public AuthService(
+            UserRepository userRepository,
+            PasswordEncoder passwordEncoder,
+            JwtService jwtService,
+            SecretGenerator secretGenerator,
+            QrGenerator qrGenerator,
+            CodeVerifier codeVerifier) {
+
+        this.userRepository = userRepository;
+        this.passwordEncoder = passwordEncoder;
+        this.jwtService = jwtService;
+        this.secretGenerator = secretGenerator;
+        this.qrGenerator = qrGenerator;
+        this.codeVerifier = codeVerifier;
+    }
+
+    public AuthResponse login(LoginRequest request) {
+        Optional<User> userOptional = userRepository.findByEmail(request.getEmail());
+
+        // FIRST TIME USER: Auto-register and grant direct entry to dashboard
+        if (userOptional.isEmpty()) {
+            User newUser = new User();
+            newUser.setEmail(request.getEmail());
+            newUser.setPassword(passwordEncoder.encode(request.getPassword()));
+
+            // Generate 2FA secret now so it's ready for their 2nd login
+            String secret = secretGenerator.generate();
+            newUser.setTwoFactorSecret(secret);
+            newUser.setTwoFactorEnabled(false);
+
+            userRepository.save(newUser);
+
+            String token = jwtService.generateToken(newUser.getEmail());
+
+            AuthResponse response = new AuthResponse();
+            response.setSuccess(true);
+            response.setAuthenticated(true);
+            response.setRequiresTwoFactor(false);
+            response.setRequiresTwoFactorSetup(false);
+            response.setMessage("First time login successful. Welcome!");
+            response.setToken(token);
+            return response;
+        }
+
+        // EXISTING USER: Verify password
+        User user = userOptional.get();
+        if (!passwordEncoder.matches(request.getPassword(), user.getPassword())) {
+            throw new ResponseStatusException(
+                    HttpStatus.UNAUTHORIZED,
+                    "Invalid email or password"
+            );
+        }
+
+        // RETURNING USER: Require 2FA verification on subsequent logins
+        AuthResponse response = new AuthResponse();
+        response.setSuccess(true);
+        response.setAuthenticated(false);
+        response.setRequiresTwoFactor(true);
+
+        // If they haven't set up 2FA in Authenticator app yet, send QR code
+        if (!user.isTwoFactorEnabled()) {
+            response.setRequiresTwoFactorSetup(true);
+            response.setQrCode(generateQrCode(user.getEmail(), user.getTwoFactorSecret()));
+            response.setMessage("Please scan the QR code in your Authenticator app and enter the code.");
+        } else {
+            response.setRequiresTwoFactorSetup(false);
+            response.setMessage("Enter the code from your Authenticator app");
+        }
+
+        return response;
+    }
+
+    public AuthResponse verifyLogin2FA(Verify2FARequest request) {
+        User user = userRepository.findByEmail(request.getEmail())
+                .orElseThrow(() -> new ResponseStatusException(
+                        HttpStatus.UNAUTHORIZED,
+                        "User not found"
+                ));
+
+        if (user.getTwoFactorSecret() == null || user.getTwoFactorSecret().isBlank()) {
+            throw new ResponseStatusException(
+                    HttpStatus.BAD_REQUEST,
+                    "Authenticator setup has not been initialized"
+            );
+        }
+
+        boolean valid = codeVerifier.isValidCode(
+                user.getTwoFactorSecret(),
+                request.getCode()
+        );
+
+        if (!valid) {
+            throw new ResponseStatusException(
+                    HttpStatus.UNAUTHORIZED,
+                    "Invalid Authenticator code"
+            );
+        }
+
+        // Enable 2FA permanently once verified
+        if (!user.isTwoFactorEnabled()) {
+            user.setTwoFactorEnabled(true);
+            userRepository.save(user);
+        }
+
+        String token = jwtService.generateToken(user.getEmail());
+
+        AuthResponse response = new AuthResponse();
+        response.setSuccess(true);
+        response.setAuthenticated(true);
+        response.setRequiresTwoFactor(false);
+        response.setRequiresTwoFactorSetup(false);
+        response.setMessage("Login successful");
+        response.setToken(token);
+
+        return response;
+    }
+
+    private String generateQrCode(String email, String secret) {
+        try {
+            QrData qrData = new Builder()
+                    .label(email)
+                    .secret(secret)
+                    .issuer("KAFM")
+                    .build();
+
+            byte[] image = qrGenerator.generate(qrData);
+            return "data:image/png;base64," + Base64.getEncoder().encodeToString(image);
+
+        } catch (Exception e) {
+            throw new ResponseStatusException(
+                    HttpStatus.INTERNAL_SERVER_ERROR,
+                    "Could not generate QR code",
+                    e
+            );
+        }
+    }
+}
--- a/kafm-backend/src/main/resources/application.properties
+++ b/kafm-backend/src/main/resources/application.properties
@@ -0,0 +1,9 @@
+spring.application.name=auth-system
+
+server.port=8080
+
+spring.data.mongodb.uri=mongodb://localhost:27017/KAFM-Auth
+
+# JWT secret
+jwt.secret=VGhpc0lzQVN1cGVyU2VjcmV0S2V5Rm9ySldUX1Rva2VuU2lnbmluZw==
+jwt.expiration=86400000
--- a/kafm-backend/src/test/java/com/example/kafm_backend/KafmBackendApplicationTests.java
+++ b/kafm-backend/src/test/java/com/example/kafm_backend/KafmBackendApplicationTests.java
@@ -0,0 +1,13 @@
+package com.example.kafm_backend;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class KafmBackendApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}