backend/feature/auth/src/adapter/delivery/auth_controller.rs

@@ -11,6 +11,7 @@ use crate::{
         use_case::{
             exchange_auth_code_use_case::ExchangeAuthCodeUseCase,
             get_auth_url_use_case::{AuthUrl, GetAuthUrlUseCase},
+            get_user_use_case::GetUserUseCase,
         },
     },
 };
@@ -25,21 +26,26 @@ pub trait AuthController: Send + Sync {
         expected_state: &str,
         expected_nonce: &str,
     ) -> Result<UserResponseDto, AuthError>;
+
+    async fn get_user(&self, user_id: i32) -> Result<UserResponseDto, AuthError>;
 }
 
 pub struct AuthControllerImpl {
     get_auth_url_use_case: Arc<dyn GetAuthUrlUseCase>,
     exchange_auth_code_use_case: Arc<dyn ExchangeAuthCodeUseCase>,
+    get_user_use_case: Arc<dyn GetUserUseCase>,
 }
 
 impl AuthControllerImpl {
     pub fn new(
         get_auth_url_use_case: Arc<dyn GetAuthUrlUseCase>,
         exchange_auth_code_use_case: Arc<dyn ExchangeAuthCodeUseCase>,
+        get_user_use_case: Arc<dyn GetUserUseCase>,
     ) -> Self {
         Self {
             get_auth_url_use_case,
             exchange_auth_code_use_case,
+            get_user_use_case,
         }
     }
 }
@@ -63,4 +69,9 @@ impl AuthController for AuthControllerImpl {
 
         result.map(|user| UserResponseDto::from(user))
     }
+
+    async fn get_user(&self, user_id: i32) -> Result<UserResponseDto, AuthError> {
+        let user = self.get_user_use_case.execute(user_id).await?;
+        Ok(UserResponseDto::from(user))
+    }
 }

backend/feature/auth/src/adapter/gateway/auth_repository_impl.rs

@@ -4,7 +4,8 @@ use async_trait::async_trait;
 
 use crate::{
     adapter::gateway::{
-        auth_oidc_service::AuthOidcService, user_db_service::UserDbService, user_db_mapper::UserMapper,
+        auth_oidc_service::AuthOidcService, user_db_mapper::UserMapper,
+        user_db_service::UserDbService,
     },
     application::{
         error::auth_error::AuthError, gateway::auth_repository::AuthRepository,
@@ -47,6 +48,13 @@ impl AuthRepository for AuthRepositoryImpl {
             .map(|dto| dto.into_entity())
     }
 
+    async fn get_user_by_id(&self, user_id: i32) -> Result<User, AuthError> {
+        self.user_db_service
+            .get_user_by_id(user_id)
+            .await
+            .map(|mapper| mapper.into_entity())
+    }
+
     async fn get_user_by_source_id(
         &self,
         issuer: &str,

backend/feature/auth/src/adapter/gateway/user_db_service.rs

@@ -1,9 +1,13 @@
 use async_trait::async_trait;
 
-use crate::{adapter::gateway::user_db_mapper::UserMapper, application::error::auth_error::AuthError};
+use crate::{
+    adapter::gateway::user_db_mapper::UserMapper, application::error::auth_error::AuthError,
+};
 
 #[async_trait]
 pub trait UserDbService: Send + Sync {
+    async fn get_user_by_id(&self, user_id: i32) -> Result<UserMapper, AuthError>;
+
     async fn get_user_by_source_id(
         &self,
         issuer: &str,

backend/feature/auth/src/application/gateway/auth_repository.rs

@@ -12,6 +12,8 @@ pub trait AuthRepository: Send + Sync {
     async fn exchange_auth_code(&self, code: &str, expected_nonce: &str)
     -> Result<User, AuthError>;
 
+    async fn get_user_by_id(&self, user_id: i32) -> Result<User, AuthError>;
+
     async fn get_user_by_source_id(&self, issuer: &str, source_id: &str)
     -> Result<User, AuthError>;
 

backend/feature/auth/src/application/use_case.rs

@@ -1,2 +1,3 @@
 pub mod exchange_auth_code_use_case;
 pub mod get_auth_url_use_case;
+pub mod get_user_use_case;

backend/feature/auth/src/application/use_case/get_user_use_case.rs

@@ -0,0 +1,30 @@
+use std::sync::Arc;
+
+use async_trait::async_trait;
+
+use crate::{
+    application::{error::auth_error::AuthError, gateway::auth_repository::AuthRepository},
+    domain::entity::user::User,
+};
+
+#[async_trait]
+pub trait GetUserUseCase: Send + Sync {
+    async fn execute(&self, user_id: i32) -> Result<User, AuthError>;
+}
+
+pub struct GetUserUseCaseImpl {
+    auth_repository: Arc<dyn AuthRepository>,
+}
+
+impl GetUserUseCaseImpl {
+    pub fn new(auth_repository: Arc<dyn AuthRepository>) -> Self {
+        Self { auth_repository }
+    }
+}
+
+#[async_trait]
+impl GetUserUseCase for GetUserUseCaseImpl {
+    async fn execute(&self, user_id: i32) -> Result<User, AuthError> {
+        self.auth_repository.get_user_by_id(user_id).await
+    }
+}

backend/feature/auth/src/framework/db/user_db_service_impl.rs

@@ -2,7 +2,7 @@ use async_trait::async_trait;
 use sqlx::{Pool, Postgres};
 
 use crate::{
-    adapter::gateway::{user_db_service::UserDbService, user_db_mapper::UserMapper},
+    adapter::gateway::{user_db_mapper::UserMapper, user_db_service::UserDbService},
     application::error::auth_error::AuthError,
     framework::db::user_record::UserRecord,
 };
@@ -19,6 +19,26 @@ impl UserDbServiceImpl {
 
 #[async_trait]
 impl UserDbService for UserDbServiceImpl {
+    async fn get_user_by_id(&self, user_id: i32) -> Result<UserMapper, AuthError> {
+        let record = sqlx::query_as!(
+            UserRecord,
+            r#"
+            SELECT id, issuer, source_id, displayed_name, email
+            FROM "user"
+            WHERE id = $1
+            "#,
+            user_id
+        )
+        .fetch_optional(&self.db_pool)
+        .await
+        .map_err(|e| AuthError::DatabaseError(e.to_string()))?;
+
+        match record {
+            Some(record) => Ok(record.into_mapper()),
+            None => Err(AuthError::UserNotFound),
+        }
+    }
+
     async fn get_user_by_source_id(
         &self,
         issuer: &str,

backend/feature/auth/src/framework/web/auth_web_routes.rs

@@ -101,6 +101,17 @@ async fn logout_handler(session: Session) -> impl Responder {
         .finish()
 }
 
-async fn get_logged_in_user_handler(user_id: UserId) -> impl Responder {
+async fn get_logged_in_user_handler(
-    HttpResponse::Ok().body(format!("Logged in user ID: {}", user_id.get()))
+    auth_controller: web::Data<dyn AuthController>,
+    user_id: UserId,
+) -> impl Responder {
+    let result = auth_controller.get_user(user_id.get()).await;
+
+    match result {
+        Ok(user) => HttpResponse::Ok().json(user),
+        Err(e) => {
+            log::error!("{e:?}");
+            HttpResponse::InternalServerError().finish()
+        }
+    }
 }

backend/server/src/container.rs

@@ -7,7 +7,7 @@ use auth::{
     },
     application::use_case::{
         exchange_auth_code_use_case::ExchangeAuthCodeUseCaseImpl,
-        get_auth_url_use_case::LoginUseCaseImpl,
+        get_auth_url_use_case::LoginUseCaseImpl, get_user_use_case::GetUserUseCaseImpl,
     },
     framework::{
         db::user_db_service_impl::UserDbServiceImpl,
@@ -68,9 +68,11 @@ impl Container {
         let get_auth_url_use_case = Arc::new(LoginUseCaseImpl::new(auth_repository.clone()));
         let exchange_auth_code_use_case =
             Arc::new(ExchangeAuthCodeUseCaseImpl::new(auth_repository.clone()));
+        let get_user_use_case = Arc::new(GetUserUseCaseImpl::new(auth_repository.clone()));
         let auth_controller = Arc::new(AuthControllerImpl::new(
             get_auth_url_use_case,
             exchange_auth_code_use_case,
+            get_user_use_case,
         ));
 
         let post_db_service = Arc::new(PostDbServiceImpl::new(db_pool.clone()));