#10 feat: jwt 비즈니스 로직 구현

core/src/main/kotlin/org/doorip/core/auth/JwtService.kt

@@ -1,13 +1,19 @@
 package org.doorip.core.auth
 
 import org.doorip.domain.UserId
-import org.springframework.stereotype.Component
+import org.doorip.support.jwt.JwtProvider
+import org.doorip.support.jwt.JwtSecretKey
+import org.springframework.stereotype.Service
 
-@Component
-internal class JwtService : AccessTokenUseCase {
+@Service
+internal class JwtService(
+    private val jwtProvider: JwtProvider,
+    private val jwtSecretKey: JwtSecretKey,
+) : AccessTokenUseCase {
 
     override fun getUserId(token: String): UserId? {
-        // TODO
-        return null
+        val subject = jwtProvider.validateAndGetSubject(token, jwtSecretKey) ?: return null
+
+        return UserId(subject.toLong())
     }
 }

core/src/main/kotlin/org/doorip/core/config/JwtConfig.kt

@@ -0,0 +1,18 @@
+package org.doorip.core.config
+
+import org.doorip.support.jwt.JwtProvider
+import org.doorip.support.jwt.JwtSecretKey
+import org.springframework.boot.context.properties.EnableConfigurationProperties
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+
+@EnableConfigurationProperties(JwtProperties::class)
+@Configuration
+internal class JwtConfig {
+
+    @Bean
+    fun jwtProvider(): JwtProvider = JwtProvider()
+
+    @Bean
+    fun jwtSecretKey(jwtProperties: JwtProperties): JwtSecretKey = JwtSecretKey(jwtProperties.secret)
+}

core/src/main/kotlin/org/doorip/core/config/JwtProperties.kt

@@ -0,0 +1,8 @@
+package org.doorip.core.config
+
+import org.springframework.boot.context.properties.ConfigurationProperties
+
+@ConfigurationProperties(prefix = "jwt")
+data class JwtProperties(
+    val secret: String,
+)

core/src/main/resources/application-jwt.yml

@@ -0,0 +1,2 @@
+jwt:
+    secret: ${JWT_SECRET_KEY}