refactor: implement partial JWT authentication; migrate to reactive spring/mongodb

Signed-off-by: Alan Brault <alan.brault@visus.io>

.env.example

@@ -0,0 +1,23 @@
+# ════════════════════════════════════════════════════════════════════════════════
+# Environment Configuration Template
+# ════════════════════════════════════════════════════════════════════════════════
+# Copy this file to .env and fill in your actual values
+# .env is gitignored and will not be committed to version control
+
+# ════════════════════════════════════════════════════════════════════════════════
+# Database Configuration
+# ════════════════════════════════════════════════════════════════════════════════
+# MongoDB connection string
+# Default: mongodb://localhost:27017/kotlin-api
+MONGODB_URI=mongodb://localhost:27017/kotlin-api
+
+# ════════════════════════════════════════════════════════════════════════════════
+# JWT Security Configuration
+# ════════════════════════════════════════════════════════════════════════════════
+# REQUIRED: Generate a secure base64-encoded secret for JWT token signing
+# MUST be base64-encoded (your code uses Decoders.BASE64.decode)
+#
+# Generate a secure base64-encoded secret (single line, no newlines):
+#   openssl rand -base64 64 | tr -d '\n'
+#
+JWT_SECRET=your-base64-encoded-secret-here

.gitignore

@@ -38,3 +38,6 @@ out/
 
 ### Kotlin ###
 .kotlin
+
+### Environment Variables ###
+.env

build.gradle.kts

@@ -3,8 +3,9 @@ plugins {
     kotlin("plugin.spring") version "2.2.21"
     id("org.springframework.boot") version "4.1.0-M2"
     id("io.spring.dependency-management") version "1.1.7"
-    id("org.jlleitschuh.gradle.ktlint") version "12.1.0"
+    id("org.jlleitschuh.gradle.ktlint") version "14.2.0"
     id("tech.mappie.plugin") version "2.2.21-2.1.1"
+    id("com.github.ben-manes.versions") version "0.53.0"
 }
 
 group = "io.visus.demos"
@@ -22,7 +23,7 @@ repositories {
 }
 
 ktlint {
-    version.set("1.4.1")
+    version.set("1.8.0")
     android.set(false)
     ignoreFailures.set(false)
     reporters {
@@ -35,37 +36,101 @@ ktlint {
 }
 
 dependencies {
+    // ════════════════════════════════════════════════════════════════════════════════
+    // Environment Configuration (.env file support)
+    // ════════════════════════════════════════════════════════════════════════════════
+    developmentOnly("me.paulschwarz:springboot4-dotenv:5.1.0")
+
+    // ════════════════════════════════════════════════════════════════════════════════
+    // Core Spring Boot & Kotlin
+    // ════════════════════════════════════════════════════════════════════════════════
+    implementation("org.springframework.boot:spring-boot-starter-webflux")
+    implementation("org.jetbrains.kotlin:kotlin-reflect")
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.10.2")
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-reactor:1.10.2")
+
+    // ════════════════════════════════════════════════════════════════════════════════
+    // JSON Processing (Jackson)
+    // ════════════════════════════════════════════════════════════════════════════════
+    // Spring Boot 4.x uses Jackson 3.x (tools.jackson.core)
+    // Third-party libs still use Jackson 2.x (see resolutionStrategy below)
     implementation("tools.jackson.core:jackson-core:3.1.0")
     implementation("tools.jackson.core:jackson-databind:3.1.0")
     implementation("tools.jackson.module:jackson-module-kotlin:3.1.0")
 
-    implementation("org.springframework.boot:spring-boot-starter-mongodb")
+    // ════════════════════════════════════════════════════════════════════════════════
-    implementation("org.springframework.boot:spring-boot-starter-restclient")
+    // Data Persistence (MongoDB)
+    // ════════════════════════════════════════════════════════════════════════════════
+    implementation("org.springframework.boot:spring-boot-starter-data-mongodb-reactive")
+
+    // ════════════════════════════════════════════════════════════════════════════════
+    // Security & Authentication
+    // ════════════════════════════════════════════════════════════════════════════════
     implementation("org.springframework.boot:spring-boot-starter-security")
-    implementation("com.password4j:password4j:1.8.2")
+    implementation("com.password4j:password4j:1.8.4")
-    implementation("org.springframework.boot:spring-boot-starter-webmvc")
+
-    implementation("org.jetbrains.kotlin:kotlin-reflect")
+    // JWT Token Management
+    implementation("io.jsonwebtoken:jjwt-api:0.13.0")
+    runtimeOnly("io.jsonwebtoken:jjwt-impl:0.13.0")
+    runtimeOnly("io.jsonwebtoken:jjwt-jackson:0.13.0")
+
+    // ════════════════════════════════════════════════════════════════════════════════
+    // Validation
+    // ════════════════════════════════════════════════════════════════════════════════
+    implementation("org.hibernate.validator:hibernate-validator:9.1.0.Final")
+
+    // ════════════════════════════════════════════════════════════════════════════════
+    // API Documentation (OpenAPI/Swagger)
+    // ════════════════════════════════════════════════════════════════════════════════
+    implementation("org.springdoc:springdoc-openapi-starter-webflux-ui:3.0.2")
+
+    // ════════════════════════════════════════════════════════════════════════════════
+    // Mapping & Utilities
+    // ════════════════════════════════════════════════════════════════════════════════
     implementation("tech.mappie:mappie-api:2.2.21-2.1.1")
-    implementation("org.springdoc:springdoc-openapi-starter-webmvc-ui:2.8.4")
+
-    implementation("org.springframework.boot:spring-boot-starter-data-mongodb")
+    // ════════════════════════════════════════════════════════════════════════════════
+    // Testing
+    // ════════════════════════════════════════════════════════════════════════════════
+    // Core Spring Boot testing support (includes JUnit 5, AssertJ, Mockito, JSONPath, etc.)
+    testImplementation("org.springframework.boot:spring-boot-starter-test")
+
+    // Spring Boot domain-specific test modules
     testImplementation("org.springframework.boot:spring-boot-starter-mongodb-test")
-    testImplementation("org.springframework.boot:spring-boot-starter-restclient-test")
     testImplementation("org.springframework.boot:spring-boot-starter-security-test")
-    testImplementation("org.springframework.boot:spring-boot-starter-webmvc-test")
+    testImplementation("org.springframework.boot:spring-boot-starter-webflux-test")
+
+    // Kotlin testing support
     testImplementation("org.jetbrains.kotlin:kotlin-test-junit5")
+    testImplementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.10.2")
+
+    // Kotlin-native mocking (more idiomatic than Mockito for Kotlin)
+    testImplementation("io.mockk:mockk:1.14.9")
+    testImplementation("com.ninja-squad:springmockk:5.0.1")
+
     testRuntimeOnly("org.junit.platform:junit-platform-launcher")
 }
 
+// ════════════════════════════════════════════════════════════════════════════════
+// Dependency Resolution Strategy
+// ════════════════════════════════════════════════════════════════════════════════
+// Force Jackson version alignment to prevent conflicts between:
+// - Spring Boot 4.x (uses Jackson 3.x / tools.jackson.core)
+// - Third-party libs still on Jackson 2.x (com.fasterxml.jackson):
+//   * springdoc-openapi:3.0.2 → brings Jackson 2.19.2
+//   * jjwt-jackson:0.12.6 → brings Jackson 2.12.7.1
 configurations.all {
     resolutionStrategy.eachDependency {
+        // Ensure Jackson 3.x is at latest stable version
         if (requested.group == "tools.jackson.core") {
             useVersion("3.1.0")
         }
+        // Upgrade legacy Jackson 2.x dependencies for security and compatibility
         if (requested.group == "com.fasterxml.jackson.core") {
             if (requested.name == "jackson-annotations") {
-                useVersion("2.21")
+                useVersion("2.21") // Annotations compatibility layer
             } else {
-                useVersion("2.21.1")
+                useVersion("2.21.1") // Core Jackson 2.x libraries
             }
         }
     }

src/main/kotlin/io/visus/demos/kotlinapi/api/dto/AuthResponse.kt

@@ -0,0 +1,15 @@
+package io.visus.demos.kotlinapi.api.dto
+
+import io.swagger.v3.oas.annotations.media.Schema
+
+@Schema(description = "Authentication response containing tokens and user information")
+data class AuthResponse(
+    @Schema(description = "JWT access token", example = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...")
+    val accessToken: String,
+    @Schema(description = "JWT refresh token", example = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...")
+    val refreshToken: String,
+    @Schema(description = "Token type", example = "Bearer")
+    val tokenType: String = "Bearer",
+    @Schema(description = "Access token expiration time in seconds", example = "3600")
+    val expiresIn: Long,
+)

src/main/kotlin/io/visus/demos/kotlinapi/api/dto/ErrorResponse.kt

@@ -0,0 +1,16 @@
+package io.visus.demos.kotlinapi.api.dto
+
+import io.swagger.v3.oas.annotations.media.Schema
+import java.time.Instant
+
+@Schema(description = "Error response")
+data class ErrorResponse(
+    @Schema(description = "HTTP status code", example = "403")
+    val status: Int,
+    @Schema(description = "Error message", example = "Forbidden: You don't have permission to access this resource")
+    val message: String,
+    @Schema(description = "Timestamp of the error occurrence", example = "2024-01-01T12:00:00Z")
+    val timestamp: Instant = Instant.now(),
+    @Schema(description = "Request path", example = "/api/v1/users/me")
+    val path: String? = null,
+)

src/main/kotlin/io/visus/demos/kotlinapi/api/dto/LoginRequest.kt

@@ -0,0 +1,16 @@
+package io.visus.demos.kotlinapi.api.dto
+
+import io.swagger.v3.oas.annotations.media.Schema
+import jakarta.validation.constraints.Email
+import jakarta.validation.constraints.NotBlank
+
+@Schema(description = "Login request")
+data class LoginRequest(
+    @field:Email(message = "Invalid email format")
+    @field:NotBlank(message = "Email is required")
+    @Schema(description = "User email address", example = "user@example.com")
+    val email: String,
+    @field:NotBlank(message = "Password is required")
+    @Schema(description = "User password", example = "P@ssw0rd!")
+    val password: String,
+)

src/main/kotlin/io/visus/demos/kotlinapi/api/dto/RefreshTokenRequest.kt

@@ -0,0 +1,11 @@
+package io.visus.demos.kotlinapi.api.dto
+
+import io.swagger.v3.oas.annotations.media.Schema
+import jakarta.validation.constraints.NotBlank
+
+@Schema(description = "Refresh token request")
+data class RefreshTokenRequest(
+    @field:NotBlank(message = "Refresh token is required")
+    @Schema(description = "JWT refresh token", example = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...")
+    val refreshToken: String,
+)

src/main/kotlin/io/visus/demos/kotlinapi/api/dto/UserDto.kt

@@ -0,0 +1,13 @@
+package io.visus.demos.kotlinapi.api.dto
+
+import io.swagger.v3.oas.annotations.media.Schema
+
+@Schema(description = "User information")
+data class UserDto(
+    @Schema(description = "Unique identifier of the user", example = "507f1f77bcf86cd799439011")
+    val id: String,
+    @Schema(description = "User email address", example = "user@example.com")
+    val email: String,
+    @Schema(description = "User role", example = "ROLE_USER")
+    val role: String,
+)

src/main/kotlin/io/visus/demos/kotlinapi/api/mappers/HealthResponseMapper.kt

@@ -5,7 +5,8 @@ import io.visus.demos.kotlinapi.domain.model.HealthStatus
 import tech.mappie.api.ObjectMappie
 
 object HealthResponseMapper : ObjectMappie<HealthStatus, HealthResponse>() {
-    override fun map(from: HealthStatus): HealthResponse = mapping {
+    override fun map(from: HealthStatus): HealthResponse =
+        mapping {
             HealthResponse::status fromProperty HealthStatus::status transform { it.name }
             HealthResponse::components fromProperty HealthStatus::components transform {
                 it.mapValues { (_, value) -> ComponentHealthDtoMapper.map(value) }

src/main/kotlin/io/visus/demos/kotlinapi/config/ApiVersionConfig.kt

@@ -4,15 +4,15 @@ import io.visus.demos.kotlinapi.api.ApiVersion
 import org.springframework.context.annotation.Configuration
 import org.springframework.core.annotation.AnnotatedElementUtils
 import org.springframework.web.bind.annotation.RestController
-import org.springframework.web.servlet.config.annotation.PathMatchConfigurer
+import org.springframework.web.reactive.config.PathMatchConfigurer
-import org.springframework.web.servlet.config.annotation.WebMvcConfigurer
+import org.springframework.web.reactive.config.WebFluxConfigurer
 
 @Configuration
-class ApiVersionConfig : WebMvcConfigurer {
+class ApiVersionConfig : WebFluxConfigurer {
-    override fun configurePathMatch(configurer: PathMatchConfigurer) {
+    override fun configurePathMatching(configurer: PathMatchConfigurer) {
         configurer.addPathPrefix("/api/v1") { controller ->
             val apiVersion = AnnotatedElementUtils.findMergedAnnotation(controller, ApiVersion::class.java)
-            controller.isAnnotationPresent(RestController::class.java) && apiVersion?.version == 1
+            AnnotatedElementUtils.hasAnnotation(controller, RestController::class.java) && apiVersion?.version == 1
         }
     }
 }

src/main/kotlin/io/visus/demos/kotlinapi/config/JwtProperties.kt

@@ -0,0 +1,13 @@
+package io.visus.demos.kotlinapi.config
+
+import org.springframework.boot.context.properties.ConfigurationProperties
+import org.springframework.stereotype.Component
+
+@Component
+@ConfigurationProperties("jwt")
+data class JwtProperties(
+    var secret: String = "",
+    var accessTokenExpiration: Long = 3600000, // 1 hour
+    var refreshTokenExpiration: Long = 2592000000, // 30 days
+    var issuer: String = "kotlin-api",
+)

src/main/kotlin/io/visus/demos/kotlinapi/config/SecurityConfig.kt

@@ -2,19 +2,19 @@ package io.visus.demos.kotlinapi.config
 
 import org.springframework.context.annotation.Bean
 import org.springframework.context.annotation.Configuration
-import org.springframework.security.config.annotation.method.configuration.EnableMethodSecurity
+import org.springframework.security.config.annotation.method.configuration.EnableReactiveMethodSecurity
-import org.springframework.security.config.annotation.web.builders.HttpSecurity
+import org.springframework.security.config.annotation.web.reactive.EnableWebFluxSecurity
-import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity
+import org.springframework.security.config.web.server.ServerHttpSecurity
 import org.springframework.security.crypto.password.PasswordEncoder
 import org.springframework.security.crypto.password4j.Argon2Password4jPasswordEncoder
-import org.springframework.security.web.SecurityFilterChain
+import org.springframework.security.web.server.SecurityWebFilterChain
 import org.springframework.web.cors.CorsConfiguration
-import org.springframework.web.cors.CorsConfigurationSource
+import org.springframework.web.cors.reactive.CorsConfigurationSource
-import org.springframework.web.cors.UrlBasedCorsConfigurationSource
+import org.springframework.web.cors.reactive.UrlBasedCorsConfigurationSource
 
 @Configuration
-@EnableWebSecurity
+@EnableWebFluxSecurity
-@EnableMethodSecurity
+@EnableReactiveMethodSecurity
 class SecurityConfig {
     @Bean
     fun corsConfigurationSource(): CorsConfigurationSource {
@@ -35,20 +35,23 @@ class SecurityConfig {
     fun passwordEncoder(): PasswordEncoder = Argon2Password4jPasswordEncoder()
 
     @Bean
-    fun securityFilterChain(http: HttpSecurity): SecurityFilterChain {
+    fun securityFilterChain(http: ServerHttpSecurity): SecurityWebFilterChain {
         http
             .csrf { it.disable() }
             .cors { it.configurationSource(corsConfigurationSource()) }
-            .authorizeHttpRequests { authorize ->
+            .authorizeExchange { authorize ->
                 authorize
-                    .requestMatchers(
+                    .pathMatchers(
                         "/swagger-ui.html",
                         "/swagger-ui/**",
                         "/v3/api-docs/**",
                         "/api-docs/**",
                         "/api/v1/health",
+                        "/api/v1/auth/login",
+                        "/api/v1/auth/refresh",
+                        "/api/v1/auth/register",
                     ).permitAll()
-                    .anyRequest()
+                    .anyExchange()
                     .authenticated()
             }
 

src/main/kotlin/io/visus/demos/kotlinapi/controller/AuthController.kt

@@ -0,0 +1,61 @@
+package io.visus.demos.kotlinapi.controller
+
+import io.swagger.v3.oas.annotations.Operation
+import io.swagger.v3.oas.annotations.media.Content
+import io.swagger.v3.oas.annotations.media.Schema
+import io.swagger.v3.oas.annotations.responses.ApiResponse
+import io.swagger.v3.oas.annotations.responses.ApiResponses
+import io.swagger.v3.oas.annotations.tags.Tag
+import io.visus.demos.kotlinapi.api.ApiVersion
+import io.visus.demos.kotlinapi.api.dto.AuthResponse
+import io.visus.demos.kotlinapi.api.dto.LoginRequest
+import io.visus.demos.kotlinapi.domain.service.AuthService
+import jakarta.validation.Valid
+import org.springframework.http.MediaType
+import org.springframework.http.ResponseEntity
+import org.springframework.web.bind.annotation.PostMapping
+import org.springframework.web.bind.annotation.RequestBody
+import org.springframework.web.bind.annotation.RestController
+
+@RestController
+@ApiVersion(version = 1)
+@Tag(name = "Authentication", description = "Endpoints for user authentication and authorization")
+class AuthController(
+    private val authService: AuthService,
+) {
+    @PostMapping("/auth/login", produces = [MediaType.APPLICATION_JSON_VALUE])
+    @Operation(
+        summary = "Login",
+        description = "Authenticate user with email and password, returns JWT tokens",
+        security = [],
+    )
+    @ApiResponses(
+        value = [
+            ApiResponse(
+                responseCode = "200",
+                description = "Successful login, returns access and refresh tokens",
+                content = [Content(schema = Schema(implementation = AuthResponse::class))],
+            ),
+            ApiResponse(
+                responseCode = "400",
+                description = "Invalid request payload",
+                content = [Content(schema = Schema(implementation = AuthResponse::class))],
+            ),
+            ApiResponse(
+                responseCode = "401",
+                description = "Unauthorized, invalid email or password",
+                content = [Content(schema = Schema(implementation = AuthResponse::class))],
+            ),
+            ApiResponse(
+                responseCode = "403",
+                description = "Forbidden",
+            ),
+        ],
+    )
+    suspend fun login(
+        @Valid @RequestBody request: LoginRequest,
+    ): ResponseEntity<AuthResponse> =
+        authService.login(request.email, request.password).let {
+            ResponseEntity.ok(it)
+        }
+}

src/main/kotlin/io/visus/demos/kotlinapi/controller/HealthController.kt

@@ -4,8 +4,6 @@ import io.swagger.v3.oas.annotations.Operation
 import io.swagger.v3.oas.annotations.media.Content
 import io.swagger.v3.oas.annotations.media.Schema
 import io.swagger.v3.oas.annotations.responses.ApiResponse
-import io.swagger.v3.oas.annotations.security.SecurityRequirement
-import io.swagger.v3.oas.annotations.security.SecurityRequirements
 import io.swagger.v3.oas.annotations.tags.Tag
 import io.visus.demos.kotlinapi.api.ApiVersion
 import io.visus.demos.kotlinapi.api.HttpStatusCodes
@@ -23,7 +21,6 @@ import org.springframework.web.bind.annotation.RestController
 @RestController
 @ApiVersion(version = 1)
 @PreAuthorize("permitAll()")
-@SecurityRequirements(SecurityRequirement(name = "bearerAuth"))
 @Tag(name = "Health", description = "Health check endpoints")
 class HealthController(
     private val healthCheckService: HealthService,
@@ -32,6 +29,7 @@ class HealthController(
     @Operation(
         summary = "Health check",
         description = "Returns the health status of the API",
+        security = [],
         responses = [
             ApiResponse(
                 responseCode = HttpStatusCodes.OK,
@@ -55,7 +53,7 @@ class HealthController(
             ),
         ],
     )
-    fun health(): ResponseEntity<HealthResponse> {
+    suspend fun health(): ResponseEntity<HealthResponse> {
         val result = healthCheckService.check()
         val response = HealthResponseMapper.map(result)
 

src/main/kotlin/io/visus/demos/kotlinapi/domain/HealthIndicator.kt

@@ -3,5 +3,5 @@ package io.visus.demos.kotlinapi.domain
 import io.visus.demos.kotlinapi.domain.model.ComponentHealth
 
 interface HealthIndicator {
-    fun check(): ComponentHealth
+    suspend fun check(): ComponentHealth
 }

src/main/kotlin/io/visus/demos/kotlinapi/domain/exception/ExpiredTokenException.kt

@@ -0,0 +1,5 @@
+package io.visus.demos.kotlinapi.domain.exception
+
+class ExpiredTokenException(
+    message: String,
+) : RuntimeException(message)

src/main/kotlin/io/visus/demos/kotlinapi/domain/exception/InvalidTokenException.kt

@@ -0,0 +1,5 @@
+package io.visus.demos.kotlinapi.domain.exception
+
+class InvalidTokenException(
+    message: String,
+) : RuntimeException(message)

src/main/kotlin/io/visus/demos/kotlinapi/domain/exception/SecurityException.kt

@@ -0,0 +1,5 @@
+package io.visus.demos.kotlinapi.domain.exception
+
+class SecurityException(
+    message: String,
+) : RuntimeException(message)

src/main/kotlin/io/visus/demos/kotlinapi/domain/exception/TokenRevokedException.kt

@@ -0,0 +1,5 @@
+package io.visus.demos.kotlinapi.domain.exception
+
+class TokenRevokedException(
+    message: String,
+) : RuntimeException(message)

src/main/kotlin/io/visus/demos/kotlinapi/domain/model/JwtTokenType.kt

@@ -0,0 +1,13 @@
+package io.visus.demos.kotlinapi.domain.model
+
+enum class JwtTokenType(
+    val value: String,
+) {
+    ACCESS("access"),
+    REFRESH("refresh"),
+    ;
+
+    companion object {
+        fun fromValue(value: String?): JwtTokenType? = entries.find { it.value == value }
+    }
+}

src/main/kotlin/io/visus/demos/kotlinapi/domain/model/RefreshToken.kt

@@ -0,0 +1,28 @@
+package io.visus.demos.kotlinapi.domain.model
+
+import org.springframework.data.annotation.CreatedDate
+import org.springframework.data.annotation.Id
+import org.springframework.data.annotation.LastModifiedDate
+import org.springframework.data.mongodb.core.index.Indexed
+import org.springframework.data.mongodb.core.mapping.Document
+import java.time.Instant
+import java.util.Date
+
+@Document(collection = "refresh_tokens")
+data class RefreshToken(
+    @Id
+    val id: String? = null,
+    @Indexed(unique = true)
+    val tokenHash: String,
+    @Indexed
+    val userId: String,
+    @Indexed(expireAfter = "30d")
+    val expiresAt: Date,
+    var isRevoked: Boolean = false,
+    @Indexed
+    val familyId: String,
+    @CreatedDate
+    val createdAt: Instant? = null,
+    @LastModifiedDate
+    val updatedAt: Instant? = null,
+)

src/main/kotlin/io/visus/demos/kotlinapi/domain/service/AuthService.kt

@@ -0,0 +1,17 @@
+package io.visus.demos.kotlinapi.domain.service
+
+import io.visus.demos.kotlinapi.api.dto.AuthResponse
+
+interface AuthService {
+    suspend fun login(
+        email: String,
+        password: String,
+    ): AuthResponse
+
+    suspend fun refreshToken(refreshToken: String): AuthResponse
+
+    suspend fun register(
+        email: String,
+        password: String,
+    ): AuthResponse
+}

src/main/kotlin/io/visus/demos/kotlinapi/domain/service/AuthServiceImpl.kt

@@ -0,0 +1,57 @@
+package io.visus.demos.kotlinapi.domain.service
+
+import io.visus.demos.kotlinapi.api.dto.AuthResponse
+import io.visus.demos.kotlinapi.config.JwtProperties
+import io.visus.demos.kotlinapi.domain.model.User
+import io.visus.demos.kotlinapi.infrastructure.security.JwtTokenProvider
+import io.visus.demos.kotlinapi.infrastructure.user.UserRepository
+import org.springframework.security.authentication.BadCredentialsException
+import org.springframework.security.core.userdetails.UsernameNotFoundException
+import org.springframework.security.crypto.password.PasswordEncoder
+import org.springframework.stereotype.Service
+
+@Service
+class AuthServiceImpl(
+    private val userRepository: UserRepository,
+    private val passwordEncoder: PasswordEncoder,
+    private val jwtTokenProvider: JwtTokenProvider,
+    private val jwtProperties: JwtProperties,
+) : AuthService {
+    override suspend fun login(
+        email: String,
+        password: String,
+    ): AuthResponse {
+        val user =
+            userRepository.findByEmail(email)
+                ?: throw UsernameNotFoundException("User not found with email: $email")
+
+        if (!passwordEncoder.matches(password, user.password)) {
+            throw BadCredentialsException("Invalid password for email: $email")
+        }
+
+        return generateAuthResponse(user)
+    }
+
+    override suspend fun refreshToken(refreshToken: String): AuthResponse {
+        TODO("Not yet implemented")
+    }
+
+    override suspend fun register(
+        email: String,
+        password: String,
+    ): AuthResponse {
+        TODO("Not yet implemented")
+    }
+
+    private fun generateAuthResponse(user: User): AuthResponse {
+        val accessToken = jwtTokenProvider.generateAccessToken(user)
+        val refreshToken = jwtTokenProvider.generateRefreshToken(user)
+
+        return AuthResponse(
+            accessToken = accessToken,
+            refreshToken = refreshToken,
+            tokenType = "Bearer",
+            expiresIn = jwtProperties.accessTokenExpiration / 1000,
+        )
+    }
+}

src/main/kotlin/io/visus/demos/kotlinapi/domain/service/HealthService.kt

@@ -1,15 +1,7 @@
 package io.visus.demos.kotlinapi.domain.service
 
-import io.visus.demos.kotlinapi.domain.HealthIndicator
 import io.visus.demos.kotlinapi.domain.model.HealthStatus
-import org.springframework.stereotype.Service
 
-@Service
+interface HealthService {
-class HealthService(
+    suspend fun check(): HealthStatus
-    private val healthIndicators: List<HealthIndicator>,
-) {
-    fun check(): HealthStatus {
-        val componentHealths = healthIndicators.map { it.check() }
-        return HealthStatus.fromComponents(componentHealths)
-    }
 }

src/main/kotlin/io/visus/demos/kotlinapi/domain/service/HealthServiceImpl.kt

@@ -0,0 +1,15 @@
+package io.visus.demos.kotlinapi.domain.service
+
+import io.visus.demos.kotlinapi.domain.HealthIndicator
+import io.visus.demos.kotlinapi.domain.model.HealthStatus
+import org.springframework.stereotype.Service
+
+@Service
+class HealthServiceImpl(
+    private val healthIndicators: List<HealthIndicator>,
+) : HealthService {
+    override suspend fun check(): HealthStatus {
+        val componentHealths = healthIndicators.map { it.check() }
+        return HealthStatus.fromComponents(componentHealths)
+    }
+}

src/main/kotlin/io/visus/demos/kotlinapi/domain/service/RefreshTokenService.kt

@@ -0,0 +1,16 @@
+package io.visus.demos.kotlinapi.domain.service
+
+import io.visus.demos.kotlinapi.domain.model.RefreshToken
+
+interface RefreshTokenService {
+    fun createRefreshToken(
+        userId: String,
+        familyId: String,
+    ): String
+
+    fun validateAndRotate(tokenString: String): RefreshToken
+
+    fun revokeAllUserTokens(userId: String)
+
+    fun revokeTokenFamily(familyId: String)
+}

src/main/kotlin/io/visus/demos/kotlinapi/domain/service/UserService.kt

@@ -1,19 +1,5 @@
 package io.visus.demos.kotlinapi.domain.service
 
-import io.visus.demos.kotlinapi.infrastructure.user.UserRepository
-import org.springframework.security.core.userdetails.UserDetails
 import org.springframework.security.core.userdetails.UserDetailsService
-import org.springframework.security.core.userdetails.UsernameNotFoundException
-import org.springframework.stereotype.Service
 
-@Service
+interface UserService : UserDetailsService
-class UserService(
-    private val userRepository: UserRepository,
-) : UserDetailsService {
-    override fun loadUserByUsername(username: String): UserDetails {
-        if (username.isBlank()) throw UsernameNotFoundException("Username must not be null or empty")
-
-        return userRepository.findByEmail(username)
-            ?: throw UsernameNotFoundException("User not found with email: $username")
-    }
-}

src/main/kotlin/io/visus/demos/kotlinapi/domain/service/UserServiceImpl.kt

@@ -0,0 +1,21 @@
+package io.visus.demos.kotlinapi.domain.service
+
+import io.visus.demos.kotlinapi.infrastructure.user.UserRepository
+import kotlinx.coroutines.runBlocking
+import org.springframework.security.core.userdetails.UserDetails
+import org.springframework.security.core.userdetails.UsernameNotFoundException
+import org.springframework.stereotype.Service
+
+@Service
+class UserServiceImpl(
+    private val userRepository: UserRepository,
+) : UserService {
+    override fun loadUserByUsername(username: String): UserDetails {
+        if (username.isBlank()) throw UsernameNotFoundException("Username must not be null or empty")
+
+        return runBlocking {
+            userRepository.findByEmail(username)
+                ?: throw UsernameNotFoundException("User not found with email: $username")
+        }
+    }
+}

src/main/kotlin/io/visus/demos/kotlinapi/infrastructure/health/MongoHealthService.kt

@@ -4,6 +4,8 @@ import com.mongodb.client.MongoClient
 import io.visus.demos.kotlinapi.domain.HealthIndicator
 import io.visus.demos.kotlinapi.domain.model.ComponentHealth
 import io.visus.demos.kotlinapi.domain.model.ComponentStatus
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
 import org.bson.Document
 import org.springframework.stereotype.Service
 
@@ -11,10 +13,13 @@ import org.springframework.stereotype.Service
 class MongoHealthService(
     private val mongoClient: MongoClient,
 ) : HealthIndicator {
-    override fun check(): ComponentHealth =
+    override suspend fun check(): ComponentHealth =
         try {
             val command = Document("ping", 1)
+
+            withContext(Dispatchers.IO) {
                 mongoClient.getDatabase("admin").runCommand(command)
+            }
 
             ComponentHealth(
                 name = "mongodb",

src/main/kotlin/io/visus/demos/kotlinapi/infrastructure/security/JwtTokenProvider.kt

@@ -0,0 +1,127 @@
+package io.visus.demos.kotlinapi.infrastructure.security
+
+import io.jsonwebtoken.Claims
+import io.jsonwebtoken.ExpiredJwtException
+import io.jsonwebtoken.Jwts
+import io.jsonwebtoken.MalformedJwtException
+import io.jsonwebtoken.UnsupportedJwtException
+import io.jsonwebtoken.io.Decoders
+import io.jsonwebtoken.security.Keys
+import io.visus.demos.kotlinapi.config.JwtProperties
+import io.visus.demos.kotlinapi.domain.model.JwtTokenType
+import org.slf4j.LoggerFactory
+import org.springframework.security.core.userdetails.UserDetails
+import org.springframework.stereotype.Component
+import java.security.SignatureException
+import java.util.Date
+import javax.crypto.SecretKey
+
+@Component
+class JwtTokenProvider(
+    private val jwtProperties: JwtProperties,
+) {
+    private val logger = LoggerFactory.getLogger(JwtTokenProvider::class.java)
+
+    private val secretKey: SecretKey by lazy {
+        val bytes = Decoders.BASE64.decode(jwtProperties.secret)
+        Keys.hmacShaKeyFor(bytes)
+    }
+
+    fun <T> extractClaim(
+        token: String,
+        claimsResolver: (Claims) -> T,
+    ): T {
+        val claims =
+            Jwts
+                .parser()
+                .verifyWith(secretKey)
+                .build()
+                .parseSignedClaims(token)
+                .payload
+
+        return claimsResolver(claims)
+    }
+
+    fun extractExpiration(token: String): Date = extractClaim(token, Claims::getExpiration)
+
+    fun extractUsername(token: String): String = extractClaim(token, Claims::getSubject)
+
+    fun extractTokenType(token: String): JwtTokenType? =
+        extractClaim(token) { claims ->
+            val typeValue = claims["type"] as? String
+            JwtTokenType.fromValue(typeValue)
+        }
+
+    fun generateAccessToken(userDetails: UserDetails): String {
+        val now = Date()
+        val expiry = Date(now.time + jwtProperties.accessTokenExpiration)
+
+        return Jwts
+            .builder()
+            .subject(userDetails.username)
+            .claim("type", JwtTokenType.ACCESS.value)
+            .claim("authorities", userDetails.authorities.map { it.authority })
+            .issuedAt(now)
+            .expiration(expiry)
+            .issuer(jwtProperties.issuer)
+            .signWith(secretKey, Jwts.SIG.HS512)
+            .compact()
+    }
+
+    fun generateRefreshToken(userDetails: UserDetails): String {
+        val now = Date()
+        val expiry = Date(now.time + jwtProperties.refreshTokenExpiration)
+
+        return Jwts
+            .builder()
+            .subject(userDetails.username)
+            .claim("type", JwtTokenType.REFRESH.value)
+            .issuedAt(now)
+            .expiration(expiry)
+            .signWith(secretKey, Jwts.SIG.HS512)
+            .compact()
+    }
+
+    fun isTokenValid(
+        token: String,
+        userDetails: UserDetails,
+        tokenType: JwtTokenType,
+    ): Boolean {
+        val username = extractUsername(token)
+        val type = extractTokenType(token)
+
+        return username == userDetails.username &&
+            type == tokenType &&
+            !isTokenExpired(token) &&
+            validateToken(token)
+    }
+
+    fun isTokenExpired(token: String): Boolean {
+        val expiration = extractExpiration(token)
+        return expiration.before(Date())
+    }
+
+    private fun validateToken(token: String): Boolean {
+        try {
+            Jwts
+                .parser()
+                .verifyWith(secretKey)
+                .build()
+                .parseSignedClaims(token)
+
+            return true
+        } catch (ex: SignatureException) {
+            logger.error("Invalid JWT signature: {}", ex.message)
+        } catch (ex: MalformedJwtException) {
+            logger.error("Invalid JWT token: {}", ex.message)
+        } catch (ex: ExpiredJwtException) {
+            logger.error("Expired JWT token: {}", ex.message)
+        } catch (ex: UnsupportedJwtException) {
+            logger.error("Unsupported JWT token: {}", ex.message)
+        } catch (ex: IllegalArgumentException) {
+            logger.error("JWT claims string is empty: {}", ex.message)
+        }
+
+        return false
+    }
+}

src/main/kotlin/io/visus/demos/kotlinapi/infrastructure/user/RefreshTokenRepository.kt

@@ -0,0 +1,28 @@
+package io.visus.demos.kotlinapi.infrastructure.user
+
+import io.visus.demos.kotlinapi.domain.model.RefreshToken
+import org.springframework.data.mongodb.repository.Query
+import org.springframework.data.mongodb.repository.Update
+import org.springframework.data.repository.kotlin.CoroutineCrudRepository
+
+interface RefreshTokenRepository : CoroutineCrudRepository<RefreshToken, String> {
+    suspend fun deleteByUserId(userId: String): Long
+
+    @Query("{ 'userId': ?0, 'isRevoked': false }")
+    suspend fun countActive(userId: String): Long
+
+    suspend fun findByFamilyId(familyId: String): List<RefreshToken>
+
+    suspend fun findByTokenHash(tokenHash: String): RefreshToken?
+
+    @Query("{ 'userId': ?0, 'isRevoked': false }")
+    suspend fun findActive(userId: String): List<RefreshToken>
+
+    @Query("{ 'familyId': ?0 }")
+    @Update($$"{ '$set': { 'isRevoked': true } }")
+    suspend fun revokeByFamilyId(familyId: String): Long
+
+    @Query("{ 'tokenHash': ?0 }")
+    @Update($$"{ '$set': { 'isRevoked': true } }")
+    suspend fun revokeByTokenHash(tokenHash: String): Long
+}

src/main/kotlin/io/visus/demos/kotlinapi/infrastructure/user/UserRepository.kt

@@ -1,10 +1,10 @@
 package io.visus.demos.kotlinapi.infrastructure.user
 
 import io.visus.demos.kotlinapi.domain.model.User
-import org.springframework.data.mongodb.repository.MongoRepository
+import org.springframework.data.repository.kotlin.CoroutineCrudRepository
 import org.springframework.stereotype.Repository
 
 @Repository
-interface UserRepository : MongoRepository<User, String> {
+interface UserRepository : CoroutineCrudRepository<User, String> {
-    fun findByEmail(email: String): User?
+    suspend fun findByEmail(email: String): User?
 }

src/main/kotlin/io/visus/demos/kotlinapi/seed/DataSeeder.kt

@@ -2,6 +2,7 @@ package io.visus.demos.kotlinapi.seed
 
 import io.visus.demos.kotlinapi.domain.model.User
 import io.visus.demos.kotlinapi.infrastructure.user.UserRepository
+import kotlinx.coroutines.runBlocking
 import org.springframework.boot.ApplicationArguments
 import org.springframework.boot.ApplicationRunner
 import org.springframework.security.crypto.password.PasswordEncoder
@@ -30,10 +31,10 @@ class DataSeeder(
         email: String,
         rawPassword: String,
         role: String,
-    ) {
+    ) = runBlocking {
         if (userRepository.findByEmail(email) != null) {
             println("User '$email' already exists — skipping.")
-            return
+            return@runBlocking
         }
 
         val hashedPassword =

src/main/resources/application.yaml

@@ -7,6 +7,12 @@ spring:
   mongodb:
     uri: ${MONGODB_URI:mongodb://localhost:27017/kotlin-api}
 
+jwt:
+  secret: ${JWT_SECRET}
+  access-token-expiration: 3600000 # 1 hour in milliseconds
+  refresh-token-expiration: 2592000000 # 30 days in milliseconds
+  issuer: kotlin-api
+
 springdoc:
   api-docs:
     path: /api-docs