add project

.gitattributes

@@ -0,0 +1,3 @@
+/gradlew text eol=lf
+*.bat text eol=crlf
+*.jar binary

.gitignore

@@ -0,0 +1,40 @@
+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/
+
+### Kotlin ###
+.kotlin

Dockerfile

@@ -0,0 +1,23 @@
+# 1단계: 빌드 스테이지
+FROM eclipse-temurin:21-jdk-alpine AS build
+WORKDIR /app
+COPY . .
+# Gradle 빌드 (실행 가능한 bootJar만 생성하도록 함)
+RUN ./gradlew clean bootJar -x test
+
+# 2단계: 실행 스테이지
+FROM eclipse-temurin:21-jre-alpine
+WORKDIR /app
+
+# 보안을 위해 비루트 사용자 생성
+RUN addgroup -S spring && adduser -S spring -G spring
+
+# 중요: 파일을 복사할 때 소유권을 spring 사용자에게 부여합니다.
+# 경로를 /app/app.jar로 명시하거나, WORKDIR 내의 상대 경로를 사용합니다.
+COPY --from=build --chown=spring:spring /app/build/libs/*.jar app.jar
+
+# 사용자 전환
+USER spring:spring
+
+# 실행 경로 수정: /app.jar가 아니라 app.jar (현재 위치) 또는 /app/app.jar를 사용해야 합니다.
+ENTRYPOINT ["java", "-jar", "-Dspring.profiles.active=prod", "app.jar"]

build.gradle.kts

@@ -0,0 +1,55 @@
+plugins {
+    kotlin("jvm") version "1.9.25"
+    kotlin("plugin.spring") version "1.9.25"
+    id("org.springframework.boot") version "3.5.9"
+    id("io.spring.dependency-management") version "1.1.7"
+    kotlin("plugin.jpa") version "1.9.25"
+}
+
+group = "me.wypark"
+version = "0.0.1-SNAPSHOT"
+description = "blog-backend"
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(21)
+    }
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation("org.springframework.boot:spring-boot-starter-data-jpa")
+    implementation("org.springframework.boot:spring-boot-starter-security")
+    implementation("org.springframework.boot:spring-boot-starter-web")
+    implementation("org.springframework.boot:spring-boot-starter-data-redis")
+    implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
+    implementation("org.jetbrains.kotlin:kotlin-reflect")
+    developmentOnly("org.springframework.boot:spring-boot-devtools")
+    runtimeOnly("org.postgresql:postgresql")
+    testImplementation("org.springframework.boot:spring-boot-starter-test")
+    testImplementation("org.jetbrains.kotlin:kotlin-test-junit5")
+    testImplementation("org.springframework.security:spring-security-test")
+    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+    implementation("io.jsonwebtoken:jjwt-api:0.12.3")
+    runtimeOnly("io.jsonwebtoken:jjwt-impl:0.12.3")
+    runtimeOnly("io.jsonwebtoken:jjwt-jackson:0.12.3")
+}
+
+kotlin {
+    compilerOptions {
+        freeCompilerArgs.addAll("-Xjsr305=strict")
+    }
+}
+
+allOpen {
+    annotation("jakarta.persistence.Entity")
+    annotation("jakarta.persistence.MappedSuperclass")
+    annotation("jakarta.persistence.Embeddable")
+}
+
+tasks.withType<Test> {
+    useJUnitPlatform()
+}

docker-compose.yml

@@ -0,0 +1,53 @@
+services:
+  # 백엔드 애플리케이션
+  blog-api:
+    build: .
+    container_name: blog-api
+    restart: always
+    environment:
+      - SPRING_DATASOURCE_URL=jdbc:postgresql://db:5432/blog_db
+      - SPRING_DATASOURCE_USERNAME=wypark
+      - SPRING_DATASOURCE_PASSWORD=your_password
+      - SPRING_DATA_REDIS_HOST=redis
+      - SPRING_DATA_REDIS_PORT=6379
+    depends_on:
+      db:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    networks:
+      - blog-net
+
+  # 데이터베이스 (PostgreSQL 17 추천)
+  db:
+    image: postgres:17-alpine
+    container_name: blog-db
+    restart: always
+    environment:
+      POSTGRES_USER: wypark
+      POSTGRES_PASSWORD: your_password
+      POSTGRES_DB: blog_db
+    volumes:
+      - ./postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U wypark -d blog_db"]
+      interval: 5s
+      retries: 5
+    networks:
+      - blog-net
+
+  # 캐시 서버 (Redis 7)
+  redis:
+    image: redis:7-alpine
+    container_name: blog-redis
+    restart: always
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 5s
+      retries: 5
+    networks:
+      - blog-net
+
+networks:
+  blog-net:
+    driver: bridge

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.3-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,251 @@
+#!/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.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   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/HEAD/platforms/jvm/plugins-application/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
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# 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 "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH="\\\"\\\""
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$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: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$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
+
+
+# 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"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,94 @@
+@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
+@rem SPDX-License-Identifier: Apache-2.0
+@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=.
+@rem This is normally unused
+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% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 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!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle.kts

@@ -0,0 +1 @@
+rootProject.name = "blog-backend"

src/main/kotlin/me/wypark/blogbackend/BlogBackendApplication.kt

@@ -0,0 +1,11 @@
+package me.wypark.blogbackend
+
+import org.springframework.boot.autoconfigure.SpringBootApplication
+import org.springframework.boot.runApplication
+
+@SpringBootApplication
+class BlogBackendApplication
+
+fun main(args: Array<String>) {
+    runApplication<BlogBackendApplication>(*args)
+}

src/main/kotlin/me/wypark/blogbackend/api/dto/TokenDto.kt

@@ -0,0 +1,8 @@
+package me.wypark.blogbackend.api.dto
+
+data class TokenDto(
+    val grantType: String = "Bearer",
+    val accessToken: String,
+    val refreshToken: String,
+    val accessTokenExpiresIn: Long
+)

src/main/kotlin/me/wypark/blogbackend/core/config/CorsConfig.kt

@@ -0,0 +1,24 @@
+package me.wypark.blogbackend.core.config
+
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+import org.springframework.web.cors.CorsConfiguration
+import org.springframework.web.cors.UrlBasedCorsConfigurationSource
+import org.springframework.web.filter.CorsFilter
+
+@Configuration
+class CorsConfig {
+    @Bean
+    fun corsFilter(): CorsFilter {
+        val source = UrlBasedCorsConfigurationSource()
+        val config = CorsConfiguration()
+
+        config.allowCredentials = true // 쿠키/토큰 허용
+        config.addAllowedOriginPattern("*") // 개발용 (배포 시 프론트 도메인으로 변경 추천)
+        config.addAllowedHeader("*")
+        config.addAllowedMethod("*") // GET, POST, PUT, DELETE 등 모두 허용
+
+        source.registerCorsConfiguration("/api/**", config)
+        return CorsFilter(source)
+    }
+}

src/main/kotlin/me/wypark/blogbackend/core/config/JpaConfig.kt

@@ -0,0 +1,8 @@
+package me.wypark.blogbackend.core.config
+
+import org.springframework.context.annotation.Configuration
+import org.springframework.data.jpa.repository.config.EnableJpaAuditing
+
+@Configuration
+@EnableJpaAuditing // 엔티티의 생성일/수정일 자동 주입 활성화
+class JpaConfig

src/main/kotlin/me/wypark/blogbackend/core/config/PasswordConfig.kt

@@ -0,0 +1,14 @@
+package me.wypark.blogbackend.core.config
+
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder
+import org.springframework.security.crypto.password.PasswordEncoder
+
+@Configuration
+class PasswordConfig {
+    @Bean
+    fun passwordEncoder(): PasswordEncoder {
+        return BCryptPasswordEncoder()
+    }
+}

src/main/kotlin/me/wypark/blogbackend/core/config/SecurityConfig.kt

@@ -0,0 +1,43 @@
+package me.wypark.blogbackend.core.config
+
+import me.wypark.blogbackend.core.config.jwt.JwtAuthenticationFilter
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+import org.springframework.http.HttpMethod
+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.web.SecurityFilterChain
+import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter
+import org.springframework.web.filter.CorsFilter
+
+@Configuration
+@EnableWebSecurity
+class SecurityConfig(
+    private val corsFilter: CorsFilter,
+    private val jwtAuthenticationFilter: JwtAuthenticationFilter // 주입 추가
+) {
+
+    @Bean
+    fun filterChain(http: HttpSecurity): SecurityFilterChain {
+        http
+            .csrf { it.disable() }
+            .httpBasic { it.disable() }
+            .formLogin { it.disable() }
+            .addFilter(corsFilter)
+            .sessionManagement {
+                it.sessionCreationPolicy(SessionCreationPolicy.STATELESS)
+            }
+            .authorizeHttpRequests { auth ->
+                auth.requestMatchers("/api/auth/**").permitAll()
+                auth.requestMatchers(HttpMethod.GET, "/api/posts/**", "/api/categories/**", "/api/tags/**").permitAll()
+                auth.requestMatchers(HttpMethod.POST, "/api/comments/**").permitAll() // 비회원 댓글 허용
+                auth.requestMatchers("/api/admin/**").hasRole("ADMIN")
+                auth.anyRequest().authenticated()
+            }
+            // 필터 등록: UsernamePasswordAuthenticationFilter 앞에 JwtFilter를 실행
+            .addFilterBefore(jwtAuthenticationFilter, UsernamePasswordAuthenticationFilter::class.java)
+
+        return http.build()
+    }
+}

src/main/kotlin/me/wypark/blogbackend/core/config/jwt/JwtAuthenticationFilter.kt

@@ -0,0 +1,48 @@
+package me.wypark.blogbackend.core.config.jwt
+
+import jakarta.servlet.FilterChain
+import jakarta.servlet.http.HttpServletRequest
+import jakarta.servlet.http.HttpServletResponse
+import org.springframework.security.core.context.SecurityContextHolder
+import org.springframework.util.StringUtils
+import org.springframework.web.filter.OncePerRequestFilter
+import org.springframework.stereotype.Component
+
+@Component
+class JwtAuthenticationFilter(
+    private val jwtProvider: JwtProvider
+) : OncePerRequestFilter() {
+
+    override fun doFilterInternal(
+        request: HttpServletRequest,
+        response: HttpServletResponse,
+        filterChain: FilterChain
+    ) {
+        // 1. Request Header에서 토큰 추출
+        val token = resolveToken(request)
+
+        // 2. 토큰 유효성 검사
+        // 토큰이 존재하고 유효하다면 인증 정보를 가져와 Context에 저장
+        if (StringUtils.hasText(token) && jwtProvider.validateToken(token!!)) {
+            val authentication = jwtProvider.getAuthentication(token)
+            SecurityContextHolder.getContext().authentication = authentication
+        }
+
+        // 3. 다음 필터로 진행
+        filterChain.doFilter(request, response)
+    }
+
+    // Request Header에서 토큰 정보 추출
+    private fun resolveToken(request: HttpServletRequest): String? {
+        val bearerToken = request.getHeader(AUTHORIZATION_HEADER)
+        if (StringUtils.hasText(bearerToken) && bearerToken.startsWith(BEARER_PREFIX)) {
+            return bearerToken.substring(7) // "Bearer " 이후의 문자열만 반환
+        }
+        return null
+    }
+
+    companion object {
+        const val AUTHORIZATION_HEADER = "Authorization"
+        const val BEARER_PREFIX = "Bearer "
+    }
+}

src/main/kotlin/me/wypark/blogbackend/core/config/jwt/JwtProvider.kt

@@ -0,0 +1,96 @@
+package me.wypark.blogbackend.core.config.jwt
+
+import io.jsonwebtoken.*
+import io.jsonwebtoken.io.Decoders
+import io.jsonwebtoken.security.Keys
+import me.wypark.blogbackend.api.dto.TokenDto
+import org.springframework.beans.factory.annotation.Value
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken
+import org.springframework.security.core.Authentication
+import org.springframework.security.core.GrantedAuthority
+import org.springframework.security.core.authority.SimpleGrantedAuthority
+import org.springframework.security.core.userdetails.User
+import org.springframework.stereotype.Component
+import java.util.*
+import javax.crypto.SecretKey
+
+@Component
+class JwtProvider(
+    @Value("\${jwt.secret}") secretKey: String,
+    @Value("\${jwt.access-token-validity}") private val accessTokenValidity: Long,
+    @Value("\${jwt.refresh-token-validity}") private val refreshTokenValidity: Long
+) {
+    private val key: SecretKey = Keys.hmacShaKeyFor(Decoders.BASE64.decode(secretKey))
+
+    // 1. 토큰 생성 (Access + Refresh 동시 발급)
+    fun generateTokenDto(authentication: Authentication): TokenDto {
+        val authorities = authentication.authorities.joinToString(",") { it.authority }
+        val now = Date().time
+
+        // Access Token 생성
+        val accessTokenExpiresIn = Date(now + accessTokenValidity)
+        val accessToken = Jwts.builder()
+            .subject(authentication.name) // email 또는 id
+            .claim("auth", authorities)   // 권한 정보 (ROLE_USER 등)
+            .expiration(accessTokenExpiresIn)
+            .signWith(key)
+            .compact()
+
+        // Refresh Token 생성 (권한 정보 등은 제외하고 만료일만 설정)
+        val refreshToken = Jwts.builder()
+            .subject(authentication.name)
+            .expiration(Date(now + refreshTokenValidity))
+            .signWith(key)
+            .compact()
+
+        return TokenDto(
+            accessToken = accessToken,
+            refreshToken = refreshToken,
+            accessTokenExpiresIn = accessTokenExpiresIn.time
+        )
+    }
+
+    // 2. 토큰에서 인증 정보(Authentication) 추출
+    fun getAuthentication(accessToken: String): Authentication {
+        val claims = parseClaims(accessToken)
+
+        if (claims["auth"] == null) {
+            throw RuntimeException("권한 정보가 없는 토큰입니다.")
+        }
+
+        val authorities: Collection<GrantedAuthority> =
+            claims["auth"].toString()
+                .split(",")
+                .map { SimpleGrantedAuthority(it) }
+
+        val principal = User(claims.subject, "", authorities)
+        return UsernamePasswordAuthenticationToken(principal, "", authorities)
+    }
+
+    // 3. 토큰 검증 (만료 여부, 위변조 여부 확인)
+    fun validateToken(token: String): Boolean {
+        try {
+            Jwts.parser().verifyWith(key).build().parseSignedClaims(token)
+            return true
+        } catch (e: SecurityException) {
+            // log.info("잘못된 JWT 서명입니다.")
+        } catch (e: MalformedJwtException) {
+            // log.info("잘못된 JWT 서명입니다.")
+        } catch (e: ExpiredJwtException) {
+            // log.info("만료된 JWT 토큰입니다.")
+        } catch (e: UnsupportedJwtException) {
+            // log.info("지원되지 않는 JWT 토큰입니다.")
+        } catch (e: IllegalArgumentException) {
+            // log.info("JWT 토큰이 잘못되었습니다.")
+        }
+        return false
+    }
+
+    private fun parseClaims(accessToken: String): Claims {
+        return try {
+            Jwts.parser().verifyWith(key).build().parseSignedClaims(accessToken).payload
+        } catch (e: ExpiredJwtException) {
+            e.claims
+        }
+    }
+}

src/main/kotlin/me/wypark/blogbackend/domain/auth/RefreshTokenRepository.kt

@@ -0,0 +1,33 @@
+package me.wypark.blogbackend.domain.auth
+
+import org.springframework.beans.factory.annotation.Value
+import org.springframework.data.redis.core.RedisTemplate
+import org.springframework.stereotype.Repository
+import java.util.concurrent.TimeUnit
+
+@Repository
+class RefreshTokenRepository(
+    private val redisTemplate: RedisTemplate<String, String>,
+    @Value("\${jwt.refresh-token-validity}") private val refreshTokenValidity: Long
+) {
+    // 저장 (Key: Email, Value: RefreshToken)
+    // RTR 핵심: 사용자가 로그인을 새로 하거나 토큰을 재발급 받을 때마다 덮어씌움
+    fun save(email: String, refreshToken: String) {
+        redisTemplate.opsForValue().set(
+            "RT:$email",
+            refreshToken,
+            refreshTokenValidity,
+            TimeUnit.MILLISECONDS
+        )
+    }
+
+    // 조회
+    fun findByEmail(email: String): String? {
+        return redisTemplate.opsForValue().get("RT:$email")
+    }
+
+    // 삭제 (로그아웃 시)
+    fun delete(email: String) {
+        redisTemplate.delete("RT:$email")
+    }
+}

src/main/resources/application-prod.yml

@@ -0,0 +1,19 @@
+spring:
+  datasource:
+    url: jdbc:postgresql://db:5432/blog_db
+    username: wypark
+    password: your_password
+  jpa:
+    hibernate:
+      ddl-auto: update
+    properties:
+      hibernate:
+        format_sql: true
+  data:
+    redis:
+      host: redis
+      port: 6379
+jwt:
+  secret: "v3ryS3cr3tK3yF0rMyB10gPr0j3ctM4k3ItL0ng3rTh4n32Byt3s!!" # 32바이트 이상 필수
+  access-token-validity: 1800000  # 30분 (ms)
+  refresh-token-validity: 604800000 # 7일 (ms)

src/main/resources/application.yml

@@ -0,0 +1,5 @@
+spring:
+  application:
+    name: blog-backend
+  profiles:
+    default: prod

src/test/kotlin/me/wypark/blogbackend/BlogBackendApplicationTests.kt

@@ -0,0 +1,13 @@
+package me.wypark.blogbackend
+
+import org.junit.jupiter.api.Test
+import org.springframework.boot.test.context.SpringBootTest
+
+@SpringBootTest
+class BlogBackendApplicationTests {
+
+    @Test
+    fun contextLoads() {
+    }
+
+}