init: scaffold from k-template with postgres + worker

crates/application/src/lib.rs

@@ -0,0 +1,2 @@
+pub mod testing;
+pub mod use_cases;

crates/application/src/testing.rs

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+use std::collections::HashMap;
+use async_trait::async_trait;
+use tokio::sync::Mutex;
+use domain::{
+    entities::User,
+    errors::DomainError,
+    ports::{PasswordHasher, TokenIssuer, UserRepository},
+    value_objects::{Email, PasswordHash, Role, UserId},
+};
+
+pub struct InMemoryUserRepository {
+    users: Mutex<HashMap<String, User>>,
+}
+
+impl InMemoryUserRepository {
+    pub fn new() -> Self {
+        Self { users: Mutex::new(HashMap::new()) }
+    }
+
+    pub async fn all(&self) -> Vec<User> {
+        self.users.lock().await.values().cloned().collect()
+    }
+}
+
+impl Default for InMemoryUserRepository {
+    fn default() -> Self { Self::new() }
+}
+
+#[async_trait]
+impl UserRepository for InMemoryUserRepository {
+    async fn find_by_id(&self, id: &UserId) -> Result<Option<User>, DomainError> {
+        Ok(self.users.lock().await.get(&id.to_string()).cloned())
+    }
+
+    async fn find_by_email(&self, email: &Email) -> Result<Option<User>, DomainError> {
+        Ok(self.users.lock().await.values()
+            .find(|u| u.email.as_str() == email.as_str())
+            .cloned())
+    }
+
+    async fn save(&self, user: &User) -> Result<(), DomainError> {
+        self.users.lock().await.insert(user.id.to_string(), user.clone());
+        Ok(())
+    }
+
+    async fn delete(&self, id: &UserId) -> Result<(), DomainError> {
+        self.users.lock().await.remove(&id.to_string());
+        Ok(())
+    }
+}
+
+pub struct StubPasswordHasher;
+
+#[async_trait]
+impl PasswordHasher for StubPasswordHasher {
+    async fn hash(&self, password: &str) -> Result<PasswordHash, DomainError> {
+        Ok(PasswordHash::from_hash(format!("hashed:{password}")))
+    }
+    async fn verify(&self, password: &str, hash: &PasswordHash) -> Result<bool, DomainError> {
+        Ok(hash.as_str() == format!("hashed:{password}"))
+    }
+}
+
+pub struct StubTokenIssuer;
+
+#[async_trait]
+impl TokenIssuer for StubTokenIssuer {
+    async fn issue(&self, user_id: &UserId, _role: &Role) -> Result<String, DomainError> {
+        Ok(format!("token:{user_id}"))
+    }
+    async fn verify(&self, token: &str) -> Result<(UserId, Role), DomainError> {
+        let id_str = token.strip_prefix("token:").ok_or_else(|| {
+            DomainError::Unauthorized("Invalid stub token".to_string())
+        })?;
+        let uuid = uuid::Uuid::parse_str(id_str)
+            .map_err(|_| DomainError::Unauthorized("Bad UUID in stub token".to_string()))?;
+        Ok((UserId::from_uuid(uuid), Role::User))
+    }
+}

crates/application/src/use_cases/get_profile.rs

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+use std::sync::Arc;
+use domain::{entities::User, errors::DomainError, ports::UserRepository, value_objects::UserId};
+
+pub struct GetProfile {
+    repo: Arc<dyn UserRepository>,
+}
+
+impl GetProfile {
+    pub fn new(repo: Arc<dyn UserRepository>) -> Self { Self { repo } }
+
+    pub async fn execute(&self, user_id: &UserId) -> Result<User, DomainError> {
+        self.repo.find_by_id(user_id).await?
+            .ok_or_else(|| DomainError::NotFound(format!("User {user_id} not found")))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::testing::{InMemoryUserRepository, StubPasswordHasher};
+    use crate::use_cases::register::RegisterUser;
+
+    #[tokio::test]
+    async fn get_profile_returns_existing_user() {
+        let repo = Arc::new(InMemoryUserRepository::new());
+        let r = RegisterUser::new(repo.clone(), Arc::new(StubPasswordHasher));
+        let user = r.execute("user@example.com", "password123").await.unwrap();
+        let uc = GetProfile::new(repo);
+        let found = uc.execute(&user.id).await.unwrap();
+        assert_eq!(found.id, user.id);
+    }
+
+    #[tokio::test]
+    async fn get_profile_returns_not_found() {
+        let repo = Arc::new(InMemoryUserRepository::new());
+        let uc = GetProfile::new(repo);
+        let result = uc.execute(&UserId::new()).await;
+        assert!(matches!(result, Err(DomainError::NotFound(_))));
+    }
+}

crates/application/src/use_cases/login.rs

@@ -0,0 +1,74 @@
+use std::sync::Arc;
+use domain::{
+    entities::User,
+    errors::DomainError,
+    ports::{PasswordHasher, TokenIssuer, UserRepository},
+    value_objects::Email,
+};
+
+pub struct LoginUser {
+    repo: Arc<dyn UserRepository>,
+    hasher: Arc<dyn PasswordHasher>,
+    issuer: Arc<dyn TokenIssuer>,
+}
+
+impl LoginUser {
+    pub fn new(
+        repo: Arc<dyn UserRepository>,
+        hasher: Arc<dyn PasswordHasher>,
+        issuer: Arc<dyn TokenIssuer>,
+    ) -> Self {
+        Self { repo, hasher, issuer }
+    }
+
+    pub async fn execute(&self, email: &str, password: &str) -> Result<(User, String), DomainError> {
+        let email = Email::new(email)?;
+        let user = self.repo.find_by_email(&email).await?
+            .ok_or_else(|| DomainError::Unauthorized("Invalid credentials".to_string()))?;
+        let valid = self.hasher.verify(password, &user.password_hash).await?;
+        if !valid {
+            return Err(DomainError::Unauthorized("Invalid credentials".to_string()));
+        }
+        let token = self.issuer.issue(&user.id, &user.role).await?;
+        Ok((user, token))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::testing::{InMemoryUserRepository, StubPasswordHasher, StubTokenIssuer};
+    use crate::use_cases::register::RegisterUser;
+
+    async fn seeded_repo() -> Arc<InMemoryUserRepository> {
+        let repo = Arc::new(InMemoryUserRepository::new());
+        let r = RegisterUser::new(repo.clone(), Arc::new(StubPasswordHasher));
+        r.execute("user@example.com", "password123").await.unwrap();
+        repo
+    }
+
+    #[tokio::test]
+    async fn login_returns_user_and_token() {
+        let repo = seeded_repo().await;
+        let uc = LoginUser::new(repo, Arc::new(StubPasswordHasher), Arc::new(StubTokenIssuer));
+        let (user, token) = uc.execute("user@example.com", "password123").await.unwrap();
+        assert_eq!(user.email.as_str(), "user@example.com");
+        assert!(token.starts_with("token:"));
+    }
+
+    #[tokio::test]
+    async fn login_rejects_wrong_password() {
+        let repo = seeded_repo().await;
+        let uc = LoginUser::new(repo, Arc::new(StubPasswordHasher), Arc::new(StubTokenIssuer));
+        let result = uc.execute("user@example.com", "wrongpassword").await;
+        assert!(matches!(result, Err(DomainError::Unauthorized(_))));
+    }
+
+    #[tokio::test]
+    async fn login_rejects_unknown_email() {
+        let repo = seeded_repo().await;
+        let uc = LoginUser::new(repo, Arc::new(StubPasswordHasher), Arc::new(StubTokenIssuer));
+        let result = uc.execute("nobody@example.com", "password123").await;
+        assert!(matches!(result, Err(DomainError::Unauthorized(_))));
+    }
+}

crates/application/src/use_cases/mod.rs

@@ -0,0 +1,7 @@
+pub mod get_profile;
+pub mod login;
+pub mod register;
+
+pub use get_profile::GetProfile;
+pub use login::LoginUser;
+pub use register::RegisterUser;

crates/application/src/use_cases/register.rs

@@ -0,0 +1,72 @@
+use std::sync::Arc;
+use domain::{
+    entities::User,
+    errors::DomainError,
+    ports::{PasswordHasher, UserRepository},
+    value_objects::{Email, UserId},
+};
+
+pub struct RegisterUser {
+    repo: Arc<dyn UserRepository>,
+    hasher: Arc<dyn PasswordHasher>,
+}
+
+impl RegisterUser {
+    pub fn new(repo: Arc<dyn UserRepository>, hasher: Arc<dyn PasswordHasher>) -> Self {
+        Self { repo, hasher }
+    }
+
+    pub async fn execute(&self, email: &str, password: &str) -> Result<User, DomainError> {
+        if password.len() < 8 {
+            return Err(DomainError::Validation("Password must be at least 8 characters".to_string()));
+        }
+        let email = Email::new(email)?;
+        if self.repo.find_by_email(&email).await?.is_some() {
+            return Err(DomainError::Conflict(format!("Email {} is already registered", email.as_str())));
+        }
+        let hash = self.hasher.hash(password).await?;
+        let user = User::new(UserId::new(), email, hash);
+        self.repo.save(&user).await?;
+        Ok(user)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::testing::{InMemoryUserRepository, StubPasswordHasher};
+
+    #[tokio::test]
+    async fn register_creates_user() {
+        let repo = Arc::new(InMemoryUserRepository::new());
+        let uc = RegisterUser::new(repo.clone(), Arc::new(StubPasswordHasher));
+        let user = uc.execute("test@example.com", "password123").await.unwrap();
+        assert_eq!(user.email.as_str(), "test@example.com");
+        assert_eq!(repo.all().await.len(), 1);
+    }
+
+    #[tokio::test]
+    async fn register_rejects_duplicate_email() {
+        let repo = Arc::new(InMemoryUserRepository::new());
+        let uc = RegisterUser::new(repo.clone(), Arc::new(StubPasswordHasher));
+        uc.execute("test@example.com", "password123").await.unwrap();
+        let result = uc.execute("test@example.com", "different1").await;
+        assert!(matches!(result, Err(DomainError::Conflict(_))));
+    }
+
+    #[tokio::test]
+    async fn register_rejects_short_password() {
+        let repo = Arc::new(InMemoryUserRepository::new());
+        let uc = RegisterUser::new(repo, Arc::new(StubPasswordHasher));
+        let result = uc.execute("test@example.com", "short").await;
+        assert!(matches!(result, Err(DomainError::Validation(_))));
+    }
+
+    #[tokio::test]
+    async fn register_rejects_invalid_email() {
+        let repo = Arc::new(InMemoryUserRepository::new());
+        let uc = RegisterUser::new(repo, Arc::new(StubPasswordHasher));
+        let result = uc.execute("notanemail", "password123").await;
+        assert!(matches!(result, Err(DomainError::Validation(_))));
+    }
+}