feat : (#31) add oauth2UserService

Author: qkrwndnjs1075

src/main/kotlin/entry/dsm/gitauth/equusgithubauth/global/oauth/service/CustomOauth2UserService.kt

@@ -0,0 +1,64 @@
+package entry.dsm.gitauth.equusgithubauth.global.oauth.service
+
+import entry.dsm.gitauth.equusgithubauth.domain.user.entity.User
+import entry.dsm.gitauth.equusgithubauth.domain.user.entity.enums.UserRole
+import entry.dsm.gitauth.equusgithubauth.domain.user.entity.repository.UserRepository
+import entry.dsm.gitauth.equusgithubauth.domain.user.presentation.dto.response.TokenResponse
+import entry.dsm.gitauth.equusgithubauth.global.oauth.OAuth2UserInfo
+import entry.dsm.gitauth.equusgithubauth.global.security.auth.CustomOauth2UserDetails
+import entry.dsm.gitauth.equusgithubauth.global.security.auth.GoogleUserDetails
+import entry.dsm.gitauth.equusgithubauth.global.security.jwt.JwtTokenProvider
+import org.springframework.security.oauth2.client.userinfo.DefaultOAuth2UserService
+import org.springframework.security.oauth2.client.userinfo.OAuth2UserRequest
+import org.springframework.security.oauth2.core.OAuth2AuthenticationException
+import org.springframework.security.oauth2.core.user.OAuth2User
+import org.springframework.stereotype.Service
+
+@Service
+class CustomOauth2UserService(
+    private val userRepository: UserRepository,
+    private val jwtTokenProvider: JwtTokenProvider
+) : DefaultOAuth2UserService() {
+
+    override fun loadUser(userRequest: OAuth2UserRequest): OAuth2User {
+        val oAuth2User = super.loadUser(userRequest)
+        val provider = userRequest.clientRegistration.registrationId
+
+
+        val oAuth2UserInfo: OAuth2UserInfo = when(provider) {
+            "google" -> GoogleUserDetails(oAuth2User.attributes)
+            else -> throw OAuth2AuthenticationException("지원하지 않는 provider: $provider")
+        }
+
+        val providerId = oAuth2UserInfo.getProviderId()
+        val loginId = "$provider$providerId"
+        val email = oAuth2UserInfo.getEmail()
+        val name = oAuth2UserInfo.getName()
+
+
+        val user = userRepository.findByLoginId(loginId) ?: run {
+            User(
+                loginId = loginId,
+                email = email,
+                password = "", // OAuth는 비밀번호가 필요 없음
+                name = name,
+                provider = provider,
+                providerId = providerId,
+                role = UserRole.USER
+            ).also { userRepository.save(it) }
+        }
+
+
+        val tokenResponse: TokenResponse = jwtTokenProvider.generateToken(loginId)
+
+        // OAuth2User의 attributes에 토큰 정보를 추가하여 클라이언트 전달에 사용
+        val updatedAttributes = oAuth2User.attributes.toMutableMap().apply {
+            put("accessToken", tokenResponse.accessToken)
+            put("accessTokenExpiration", tokenResponse.accessTokenExpiration.toString())
+            put("refreshToken", tokenResponse.refreshToken)
+            put("refreshTokenExpiration", tokenResponse.refreshTokenExpiration.toString())
+        }
+
+        return CustomOauth2UserDetails(user, updatedAttributes)
+    }
+}