feat(desktop): 支持桌面端三十天免登录

backend/app/api/v1/auth.py

@@ -1,5 +1,6 @@
 from datetime import datetime, timedelta, timezone
-from fastapi import APIRouter, Depends, HTTPException, Query, Response, status
+from dataclasses import dataclass
+from fastapi import APIRouter, Depends, HTTPException, Query, Request, Response, status
 from fastapi import File, UploadFile
 from pydantic import BaseModel, EmailStr, Field
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -70,12 +71,50 @@ AVATAR_ALLOWED_CONTENT_TYPES = {
 }
 
 
-def issue_user_token(db_user) -> Token:
+@dataclass(frozen=True)
+class SessionPolicy:
+    access_minutes: int
+    absolute_max_seconds: int
+
+
+def normalize_session_client_type(value: str | None) -> str:
+    return "desktop" if (value or "").strip().lower() == "desktop" else "web"
+
+
+def get_session_policy_for_client_type(client_type: str) -> SessionPolicy:
+    if client_type == "desktop":
+        max_seconds = settings.DESKTOP_SESSION_MAX_DAYS * 24 * 3600
+        return SessionPolicy(
+            access_minutes=settings.DESKTOP_SESSION_MAX_DAYS * 24 * 60,
+            absolute_max_seconds=max_seconds,
+        )
+    return SessionPolicy(
+        access_minutes=settings.JWT_EXPIRE_MINUTES,
+        absolute_max_seconds=settings.ABSOLUTE_SESSION_MAX_HOURS * 3600,
+    )
+
+
+def get_request_session_client_type(request: Request) -> str:
+    return normalize_session_client_type(request.headers.get("x-ctms-client-type"))
+
+
+def policy_expires_at(issued_at: datetime, session_start: datetime, policy: SessionPolicy) -> datetime:
+    access_expires_at = issued_at + timedelta(minutes=policy.access_minutes)
+    session_expires_at = session_start + timedelta(seconds=policy.absolute_max_seconds)
+    return min(access_expires_at, session_expires_at)
+
+
+def issue_user_token(db_user, request: Request) -> Token:
     session_start = datetime.now(timezone.utc)
+    client_type = get_request_session_client_type(request)
+    policy = get_session_policy_for_client_type(client_type)
     access_token = create_access_token(
         user_id=str(db_user.id),
-        expires_minutes=None,
+        expires_minutes=policy.access_minutes,
         session_start=session_start,
+        max_age_seconds=policy.absolute_max_seconds,
+        issued_at=session_start,
+        client_type=client_type,
     )
     return Token(access_token=access_token, token_type="bearer")
 
@@ -240,23 +279,23 @@ async def get_login_key() -> LoginKeyResponse:
 
 @router.post("/login", response_model=Token)
 async def login_for_access_token(
-    payload: LoginRequest, db: AsyncSession = Depends(get_db_session)
+    payload: LoginRequest, request: Request, db: AsyncSession = Depends(get_db_session)
 ) -> Token:
     db_user = await authenticate_encrypted_password(payload, db)
     ensure_user_active(db_user)
 
-    return issue_user_token(db_user)
+    return issue_user_token(db_user, request)
 
 
 @router.post("/dev-login", response_model=Token)
 async def dev_login_for_access_token(
-    payload: DevLoginRequest, db: AsyncSession = Depends(get_db_session)
+    payload: DevLoginRequest, request: Request, db: AsyncSession = Depends(get_db_session)
 ) -> Token:
     if settings.ENV != "development":
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Not found")
     db_user = await authenticate_plain_password(payload, db)
     ensure_user_active(db_user)
-    return issue_user_token(db_user)
+    return issue_user_token(db_user, request)
 
 
 @router.get("/me", response_model=UserRead)
@@ -285,19 +324,23 @@ async def extend_access_token(
     if db_user.status != UserStatus.ACTIVE:
         raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="账号已停用")
     session_start_ts = payload.get("orig_iat") or payload.get("iat")
+    policy = get_session_policy_for_client_type(normalize_session_client_type(payload.get("client_type")))
     if session_start_ts:
-        max_seconds = settings.ABSOLUTE_SESSION_MAX_HOURS * 3600
-        if now_ts - int(session_start_ts) > max_seconds:
+        if now_ts - int(session_start_ts) > policy.absolute_max_seconds:
             raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="会话已到期，请重新登录")
         session_start = datetime.fromtimestamp(int(session_start_ts), tz=timezone.utc)
     else:
         session_start = datetime.now(timezone.utc)
+    issued_at = datetime.now(timezone.utc)
     new_token = create_access_token(
         user_id=str(db_user.id),
-        expires_minutes=None,
+        expires_minutes=policy.access_minutes,
         session_start=session_start,
+        max_age_seconds=policy.absolute_max_seconds,
+        issued_at=issued_at,
+        client_type=normalize_session_client_type(payload.get("client_type")),
     )
-    expires_at = datetime.now(timezone.utc) + timedelta(minutes=settings.JWT_EXPIRE_MINUTES)
+    expires_at = policy_expires_at(issued_at, session_start, policy)
     return ExtendResponse(accessToken=new_token, expiresAt=expires_at)