sz-rust-auth-facade 0.6.3

//! SSO 认证中心
//!
//! 对齐 spec.md FR-5 ~ FR-7，design.md §3。
//!
//! ## 核心组件
//!
//! - [`UserAuthService`]：用户认证后端 trait 抽象
//! - [`SsoService`]：SSO 认证中心核心逻辑
//! - [`UserInfo`]：用户信息
//!
//! ## axum 集成（需启用 `axum` feature）
//!
//! ```ignore
//! use sz_rust_auth_facade::sso::axum_routes::sso_routes;
//! ```

use crate::refresh::{
    RefreshTokenError, RefreshTokenIssuer, RefreshTokenRevoker, RefreshTokenVerifier, SsoClaims,
    TokenPair,
};
use std::sync::Arc;

// ── 用户信息 ──

/// 用户信息
#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
pub struct UserInfo {
    /// 用户 ID
    pub user_id: i64,
    /// 用户名
    pub username: String,
    /// 角色
    #[serde(default, skip_serializing_if = "Vec::is_empty")]
    pub roles: Vec<String>,
    /// 权限
    #[serde(default, skip_serializing_if = "Vec::is_empty")]
    pub permissions: Vec<String>,
}

// ── UserAuthService trait ──

/// 用户认证后端 trait 抽象
///
/// 实现者负责具体的用户名密码校验（如 DB 查询 + bcrypt）。
#[async_trait::async_trait]
pub trait UserAuthService: Send + Sync {
    /// 用户名密码认证，返回用户信息
    async fn authenticate(
        &self,
        username: &str,
        password: &str,
    ) -> Result<UserInfo, RefreshTokenError>;
    /// 按 user_id 获取用户信息
    async fn get_user_info(&self, user_id: i64) -> Result<UserInfo, RefreshTokenError>;
}

// ── LoginResponse ──

/// 登录响应
#[derive(Debug, Clone, serde::Serialize)]
pub struct LoginResponse {
    /// 双 Token
    #[serde(flatten)]
    pub tokens: TokenPair,
    /// 用户 ID
    pub user_id: i64,
    /// 用户名
    pub username: String,
}

// ── SsoService ──

/// SSO 认证中心核心服务
///
/// 组合 Issuer/Verifier/Revoker + UserAuthService，
/// 提供 login/refresh/revoke/validate/me 五大操作。
pub struct SsoService {
    issuer: RefreshTokenIssuer,
    verifier: RefreshTokenVerifier,
    revoker: RefreshTokenRevoker,
    user_auth: Arc<dyn UserAuthService>,
}

impl SsoService {
    /// 创建 SSO 服务
    pub fn new(
        issuer: RefreshTokenIssuer,
        verifier: RefreshTokenVerifier,
        revoker: RefreshTokenRevoker,
        user_auth: Arc<dyn UserAuthService>,
    ) -> Self {
        Self {
            issuer,
            verifier,
            revoker,
            user_auth,
        }
    }

    /// 登录：用户名密码认证 → 签发双 Token
    #[tracing::instrument(skip(self, password), fields(username = username))]
    pub async fn login(
        &self,
        username: &str,
        password: &str,
    ) -> Result<LoginResponse, RefreshTokenError> {
        if username.is_empty() || password.is_empty() {
            return Err(RefreshTokenError::InvalidCredentials);
        }

        let user_info = self.user_auth.authenticate(username, password).await?;
        let tokens = self
            .issuer
            .issue(user_info.user_id, &user_info.username)
            .await?;

        Ok(LoginResponse {
            tokens,
            user_id: user_info.user_id,
            username: user_info.username,
        })
    }

    /// 刷新：旧 refreshToken → 新 TokenPair
    #[tracing::instrument(skip(self, refresh_token))]
    pub async fn refresh(&self, refresh_token: &str) -> Result<TokenPair, RefreshTokenError> {
        self.issuer.rotate(refresh_token).await
    }

    /// 撤销单个 Token
    #[tracing::instrument(skip(self, token))]
    pub async fn revoke(&self, token: &str) -> Result<(), RefreshTokenError> {
        self.revoker.revoke(token).await
    }

    /// 撤销用户所有 Token
    #[tracing::instrument(skip(self), fields(user_id = user_id))]
    pub async fn revoke_all(&self, user_id: i64) -> Result<(), RefreshTokenError> {
        self.revoker.revoke_all(user_id).await
    }

    /// 校验 accessToken
    #[tracing::instrument(skip(self, access_token))]
    pub async fn validate(&self, access_token: &str) -> Result<SsoClaims, RefreshTokenError> {
        self.verifier.verify_access(access_token).await
    }

    /// 获取用户信息
    #[tracing::instrument(skip(self), fields(user_id = user_id))]
    pub async fn me(&self, user_id: i64) -> Result<UserInfo, RefreshTokenError> {
        self.user_auth.get_user_info(user_id).await
    }
}

// ── axum HTTP 端点（feature = "axum"） ──

/// axum 路由集成
#[cfg(feature = "axum")]
pub mod axum_routes {
    use super::*;
    use axum::extract::{Path, State};
    use axum::http::StatusCode;
    use axum::response::{IntoResponse, Response};
    use axum::routing::{get, post};
    use axum::Json;
    use axum::Router;
    use serde::Deserialize;

    /// SSO 共享状态
    pub type SsoState = Arc<SsoService>;

    /// 构建 SSO 路由
    pub fn sso_routes() -> Router<SsoState> {
        Router::new()
            .route("/sso/login", post(login))
            .route("/sso/refresh", post(refresh))
            .route("/sso/revoke", post(revoke))
            .route("/sso/validate", get(validate))
            .route("/sso/me/:user_id", get(me))
    }

    #[derive(Deserialize)]
    struct LoginRequest {
        username: String,
        password: String,
    }

    #[derive(Deserialize)]
    struct TokenRequest {
        token: String,
    }

    #[derive(serde::Serialize)]
    struct ErrorResponse {
        code: i32,
        msg: String,
    }

    #[derive(serde::Serialize)]
    struct SuccessResponse<T: serde::Serialize> {
        code: i32,
        msg: String,
        data: T,
    }

    #[derive(serde::Serialize)]
    struct ValidateResponse {
        valid: bool,
        user_id: i64,
        expires_at: i64,
    }

    fn error_response(err: RefreshTokenError) -> Response {
        let (status, msg) = match &err {
            RefreshTokenError::InvalidCredentials => (StatusCode::UNAUTHORIZED, err.to_string()),
            RefreshTokenError::Expired | RefreshTokenError::Revoked => {
                (StatusCode::UNAUTHORIZED, err.to_string())
            }
            RefreshTokenError::WrongTokenType { .. } => (StatusCode::UNAUTHORIZED, err.to_string()),
            RefreshTokenError::IssuerMismatch { .. } => (StatusCode::UNAUTHORIZED, err.to_string()),
            RefreshTokenError::VersionMismatch { .. } => {
                (StatusCode::UNAUTHORIZED, err.to_string())
            }
            RefreshTokenError::ReuseDetected => (StatusCode::UNAUTHORIZED, err.to_string()),
            RefreshTokenError::InvalidSignature => (StatusCode::UNAUTHORIZED, err.to_string()),
            RefreshTokenError::UserNotFound => (StatusCode::NOT_FOUND, err.to_string()),
            _ => (StatusCode::INTERNAL_SERVER_ERROR, err.to_string()),
        };
        (
            status,
            [("Cache-Control", "no-store"), ("Pragma", "no-cache")],
            Json(ErrorResponse { code: -1, msg }),
        )
            .into_response()
    }

    fn success_response<T: serde::Serialize>(data: T) -> Response {
        (
            StatusCode::OK,
            [("Cache-Control", "no-store"), ("Pragma", "no-cache")],
            Json(SuccessResponse {
                code: 0,
                msg: "success".to_string(),
                data,
            }),
        )
            .into_response()
    }

    /// POST /sso/login
    async fn login(State(sso): State<SsoState>, Json(req): Json<LoginRequest>) -> Response {
        match sso.login(&req.username, &req.password).await {
            Ok(resp) => success_response(resp),
            Err(err) => error_response(err),
        }
    }

    /// POST /sso/refresh
    async fn refresh(State(sso): State<SsoState>, Json(req): Json<TokenRequest>) -> Response {
        match sso.refresh(&req.token).await {
            Ok(pair) => success_response(pair),
            Err(err) => error_response(err),
        }
    }

    /// POST /sso/revoke
    async fn revoke(State(sso): State<SsoState>, Json(req): Json<TokenRequest>) -> Response {
        match sso.revoke(&req.token).await {
            Ok(()) => success_response(serde_json::json!({ "revoked": true })),
            Err(err) => error_response(err),
        }
    }

    /// GET /sso/validate
    async fn validate(
        State(sso): State<SsoState>,
        axum::extract::Query(params): axum::extract::Query<ValidateQuery>,
    ) -> Response {
        match sso.validate(&params.token).await {
            Ok(claims) => success_response(ValidateResponse {
                valid: true,
                user_id: claims.user_id.unwrap_or(0),
                expires_at: claims.exp,
            }),
            Err(err) => error_response(err),
        }
    }

    #[derive(Deserialize)]
    struct ValidateQuery {
        token: String,
    }

    /// GET /sso/me/:user_id
    async fn me(State(sso): State<SsoState>, Path(user_id): Path<i64>) -> Response {
        match sso.me(user_id).await {
            Ok(info) => success_response(info),
            Err(err) => error_response(err),
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::refresh::{
        MemoryRefreshTokenStore, MemoryTokenBlacklist, RefreshTokenConfig, RefreshTokenStore,
        SsoJwtCodec, TokenBlacklist,
    };

    struct MockUserAuth {
        users: parking_lot::RwLock<std::collections::HashMap<String, (String, UserInfo)>>,
    }

    impl MockUserAuth {
        fn new() -> Self {
            let users = std::collections::HashMap::from([(
                "user1".to_string(),
                (
                    "pass1".to_string(),
                    UserInfo {
                        user_id: 1,
                        username: "user1".to_string(),
                        roles: vec!["admin".to_string()],
                        permissions: vec![],
                    },
                ),
            )]);
            Self {
                users: parking_lot::RwLock::new(users),
            }
        }
    }

    #[async_trait::async_trait]
    impl UserAuthService for MockUserAuth {
        async fn authenticate(
            &self,
            username: &str,
            password: &str,
        ) -> Result<UserInfo, RefreshTokenError> {
            let users = self.users.read();
            match users.get(username) {
                Some((stored_pass, info)) if stored_pass == password => Ok(info.clone()),
                _ => Err(RefreshTokenError::InvalidCredentials),
            }
        }

        async fn get_user_info(&self, user_id: i64) -> Result<UserInfo, RefreshTokenError> {
            let users = self.users.read();
            users
                .values()
                .find(|(_, info)| info.user_id == user_id)
                .map(|(_, info)| info.clone())
                .ok_or(RefreshTokenError::UserNotFound)
        }
    }

    fn make_sso_service() -> SsoService {
        let codec = SsoJwtCodec::new("test-secret");
        let blacklist: Arc<dyn TokenBlacklist> = Arc::new(MemoryTokenBlacklist::new());
        let store: Arc<dyn RefreshTokenStore> = Arc::new(MemoryRefreshTokenStore::new());
        let config = RefreshTokenConfig::default();
        let issuer = RefreshTokenIssuer::new(
            codec.clone(),
            blacklist.clone(),
            store.clone(),
            config.clone(),
        );
        let verifier = RefreshTokenVerifier::new(
            codec.clone(),
            blacklist.clone(),
            store.clone(),
            config.issuer.clone(),
        );
        let revoker = RefreshTokenRevoker::new(codec, blacklist, store);
        let user_auth: Arc<dyn UserAuthService> = Arc::new(MockUserAuth::new());
        SsoService::new(issuer, verifier, revoker, user_auth)
    }

    #[tokio::test]
    async fn test_sso_login_success() {
        let sso = make_sso_service();
        let resp = sso.login("user1", "pass1").await.unwrap();
        assert_eq!(resp.user_id, 1);
        assert_eq!(resp.username, "user1");
        assert!(!resp.tokens.access_token.is_empty());
        assert!(!resp.tokens.refresh_token.is_empty());
    }

    #[tokio::test]
    async fn test_sso_login_wrong_password() {
        let sso = make_sso_service();
        let result = sso.login("user1", "wrong").await;
        assert!(matches!(result, Err(RefreshTokenError::InvalidCredentials)));
    }

    #[tokio::test]
    async fn test_sso_login_empty_credentials() {
        let sso = make_sso_service();
        assert!(matches!(
            sso.login("", "pass").await,
            Err(RefreshTokenError::InvalidCredentials)
        ));
        assert!(matches!(
            sso.login("user", "").await,
            Err(RefreshTokenError::InvalidCredentials)
        ));
    }

    #[tokio::test]
    async fn test_sso_refresh_and_validate() {
        let sso = make_sso_service();
        let login_resp = sso.login("user1", "pass1").await.unwrap();

        let claims = sso.validate(&login_resp.tokens.access_token).await.unwrap();
        assert_eq!(claims.user_id, Some(1));

        let new_tokens = sso.refresh(&login_resp.tokens.refresh_token).await.unwrap();
        let new_claims = sso.validate(&new_tokens.access_token).await.unwrap();
        assert_eq!(new_claims.user_id, Some(1));
    }

    #[tokio::test]
    async fn test_sso_revoke_and_me() {
        let sso = make_sso_service();
        let login_resp = sso.login("user1", "pass1").await.unwrap();

        sso.revoke(&login_resp.tokens.refresh_token).await.unwrap();
        let result = sso.refresh(&login_resp.tokens.refresh_token).await;
        assert!(matches!(result, Err(RefreshTokenError::ReuseDetected)));

        let user_info = sso.me(1).await.unwrap();
        assert_eq!(user_info.username, "user1");
    }

    #[tokio::test]
    async fn test_sso_revoke_all() {
        let sso = make_sso_service();
        let login_resp = sso.login("user1", "pass1").await.unwrap();

        sso.revoke_all(1).await.unwrap();
        let result = sso.validate(&login_resp.tokens.access_token).await;
        assert!(matches!(
            result,
            Err(RefreshTokenError::VersionMismatch { .. })
        ));
    }
}