adding user authentication

src/domain/entities/file.rs

@@ -50,6 +50,22 @@ pub struct File {
 
 // Ya no necesitamos este módulo, ahora usamos un String directamente
 
+impl Default for File {
+    fn default() -> Self {
+        Self {
+            id: "stub-id".to_string(),
+            name: "stub-file.txt".to_string(),
+            storage_path: StoragePath::from_string("/"),
+            path_string: "/".to_string(),
+            size: 0,
+            mime_type: "application/octet-stream".to_string(),
+            folder_id: None,
+            created_at: 0,
+            modified_at: 0,
+        }
+    }
+}
+
 impl File {
     /// Crea un nuevo archivo con validación
     pub fn new(

src/domain/entities/folder.rs

@@ -44,6 +44,20 @@ pub struct Folder {
 
 // Ya no necesitamos este módulo, ahora usamos un String directamente
 
+impl Default for Folder {
+    fn default() -> Self {
+        Self {
+            id: "stub-id".to_string(),
+            name: "stub-folder".to_string(),
+            storage_path: StoragePath::from_string("/"),
+            path_string: "/".to_string(),
+            parent_id: None,
+            created_at: 0,
+            modified_at: 0,
+        }
+    }
+}
+
 impl Folder {
     /// Creates a new folder with validation
     pub fn new(

src/domain/entities/mod.rs

@@ -1,3 +1,5 @@
 pub mod file;
 pub mod folder;
+pub mod user;
+pub mod session;
 

src/domain/entities/session.rs

@@ -0,0 +1,70 @@
+use serde::{Serialize, Deserialize};
+use uuid::Uuid;
+use chrono::{DateTime, Utc, Duration};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Session {
+    pub id: String,
+    pub user_id: String,
+    pub refresh_token: String,
+    pub expires_at: DateTime<Utc>,
+    pub ip_address: Option<String>,
+    pub user_agent: Option<String>,
+    pub created_at: DateTime<Utc>,
+    pub revoked: bool,
+}
+
+impl Session {
+    pub fn new(
+        user_id: String,
+        refresh_token: String,
+        ip_address: Option<String>,
+        user_agent: Option<String>,
+        expires_in_days: i64,
+    ) -> Self {
+        let now = Utc::now();
+        Self {
+            id: Uuid::new_v4().to_string(),
+            user_id,
+            refresh_token,
+            expires_at: now + Duration::days(expires_in_days),
+            ip_address,
+            user_agent,
+            created_at: now,
+            revoked: false,
+        }
+    }
+    
+    // Getters
+    pub fn id(&self) -> &str {
+        &self.id
+    }
+    
+    pub fn user_id(&self) -> &str {
+        &self.user_id
+    }
+    
+    pub fn refresh_token(&self) -> &str {
+        &self.refresh_token
+    }
+    
+    pub fn expires_at(&self) -> DateTime<Utc> {
+        self.expires_at
+    }
+    
+    pub fn created_at(&self) -> DateTime<Utc> {
+        self.created_at
+    }
+    
+    pub fn is_expired(&self) -> bool {
+        Utc::now() > self.expires_at
+    }
+    
+    pub fn is_revoked(&self) -> bool {
+        self.revoked
+    }
+    
+    pub fn revoke(&mut self) {
+        self.revoked = true;
+    }
+}

src/domain/entities/user.rs

@@ -0,0 +1,232 @@
+use serde::{Serialize, Deserialize};
+use argon2::{Argon2, PasswordHash, PasswordHasher, PasswordVerifier};
+use argon2::password_hash::SaltString;
+use rand_core::OsRng;
+use uuid::Uuid;
+use chrono::{DateTime, Utc};
+
+#[derive(Debug, thiserror::Error)]
+pub enum UserError {
+    #[error("Username inválido: {0}")]
+    InvalidUsername(String),
+    
+    #[error("Password inválido: {0}")]
+    InvalidPassword(String),
+    
+    #[error("Error en la validación: {0}")]
+    ValidationError(String),
+    
+    #[error("Error en la autenticación: {0}")]
+    AuthenticationError(String),
+}
+
+pub type UserResult<T> = Result<T, UserError>;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, sqlx::Type)]
+#[sqlx(rename_all = "lowercase")]
+pub enum UserRole {
+    Admin,
+    User,
+}
+
+impl std::fmt::Display for UserRole {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        match self {
+            UserRole::Admin => write!(f, "admin"),
+            UserRole::User => write!(f, "user"),
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct User {
+    id: String,
+    username: String, 
+    email: String,
+    #[serde(skip_serializing)]
+    password_hash: String,
+    role: UserRole,
+    storage_quota_bytes: i64,
+    storage_used_bytes: i64,
+    created_at: DateTime<Utc>,
+    updated_at: DateTime<Utc>,
+    last_login_at: Option<DateTime<Utc>>,
+    active: bool,
+}
+
+impl User {
+    pub fn new(
+        username: String,
+        email: String, 
+        password: String,
+        role: UserRole,
+        storage_quota_bytes: i64,
+    ) -> UserResult<Self> {
+        // Validaciones
+        if username.is_empty() || username.len() < 3 || username.len() > 32 {
+            return Err(UserError::InvalidUsername(format!(
+                "Username debe tener entre 3 y 32 caracteres"
+            )));
+        }
+        
+        if !email.contains('@') || email.len() < 5 {
+            return Err(UserError::ValidationError(format!(
+                "Email inválido"
+            )));
+        }
+        
+        if password.len() < 8 {
+            return Err(UserError::InvalidPassword(format!(
+                "Password debe tener al menos 8 caracteres"
+            )));
+        }
+        
+        // Generar hash con Argon2id (recomendado para 2023+)
+        let salt = SaltString::generate(&mut OsRng);
+        let argon2 = Argon2::default();
+        let password_hash = argon2.hash_password(password.as_bytes(), &salt)
+            .map_err(|e| UserError::ValidationError(format!("Error al generar hash: {}", e)))?
+            .to_string();
+        
+        let now = Utc::now();
+        
+        Ok(Self {
+            id: Uuid::new_v4().to_string(),
+            username,
+            email,
+            password_hash,
+            role,
+            storage_quota_bytes,
+            storage_used_bytes: 0,
+            created_at: now,
+            updated_at: now,
+            last_login_at: None,
+            active: true,
+        })
+    }
+    
+    // Crear desde valores existentes (para reconstrucción desde BD)
+    pub fn from_data(
+        id: String,
+        username: String,
+        email: String,
+        password_hash: String,
+        role: UserRole,
+        storage_quota_bytes: i64,
+        storage_used_bytes: i64,
+        created_at: DateTime<Utc>,
+        updated_at: DateTime<Utc>,
+        last_login_at: Option<DateTime<Utc>>,
+        active: bool,
+    ) -> Self {
+        Self {
+            id,
+            username,
+            email,
+            password_hash,
+            role,
+            storage_quota_bytes,
+            storage_used_bytes,
+            created_at,
+            updated_at,
+            last_login_at,
+            active,
+        }
+    }
+    
+    // Getters
+    pub fn id(&self) -> &str {
+        &self.id
+    }
+    
+    pub fn username(&self) -> &str {
+        &self.username
+    }
+    
+    pub fn email(&self) -> &str {
+        &self.email
+    }
+    
+    pub fn role(&self) -> UserRole {
+        self.role
+    }
+    
+    pub fn storage_quota_bytes(&self) -> i64 {
+        self.storage_quota_bytes
+    }
+    
+    pub fn storage_used_bytes(&self) -> i64 {
+        self.storage_used_bytes
+    }
+    
+    pub fn created_at(&self) -> DateTime<Utc> {
+        self.created_at
+    }
+    
+    pub fn updated_at(&self) -> DateTime<Utc> {
+        self.updated_at
+    }
+    
+    pub fn last_login_at(&self) -> Option<DateTime<Utc>> {
+        self.last_login_at
+    }
+    
+    pub fn is_active(&self) -> bool {
+        self.active
+    }
+    
+    pub fn password_hash(&self) -> &str {
+        &self.password_hash
+    }
+    
+    // Verificación de password
+    pub fn verify_password(&self, password: &str) -> UserResult<bool> {
+        let parsed_hash = PasswordHash::new(&self.password_hash)
+            .map_err(|e| UserError::AuthenticationError(format!("Error al procesar hash: {}", e)))?;
+        
+        Ok(Argon2::default().verify_password(password.as_bytes(), &parsed_hash).is_ok())
+    }
+    
+    // Cambiar contraseña
+    pub fn update_password(&mut self, new_password: String) -> UserResult<()> {
+        if new_password.len() < 8 {
+            return Err(UserError::InvalidPassword(format!(
+                "Password debe tener al menos 8 caracteres"
+            )));
+        }
+        
+        let salt = SaltString::generate(&mut OsRng);
+        let argon2 = Argon2::default();
+        self.password_hash = argon2.hash_password(new_password.as_bytes(), &salt)
+            .map_err(|e| UserError::ValidationError(format!("Error al generar hash: {}", e)))?
+            .to_string();
+        
+        self.updated_at = Utc::now();
+        Ok(())
+    }
+    
+    // Actualizar uso de almacenamiento
+    pub fn update_storage_used(&mut self, storage_used_bytes: i64) {
+        self.storage_used_bytes = storage_used_bytes;
+        self.updated_at = Utc::now();
+    }
+    
+    // Registrar login
+    pub fn register_login(&mut self) {
+        let now = Utc::now();
+        self.last_login_at = Some(now);
+        self.updated_at = now;
+    }
+    
+    // Desactivar usuario
+    pub fn deactivate(&mut self) {
+        self.active = false;
+        self.updated_at = Utc::now();
+    }
+    
+    // Activar usuario
+    pub fn activate(&mut self) {
+        self.active = true;
+        self.updated_at = Utc::now();
+    }
+}