施工(HEL-226): 实现登录门户与本机免密切换账号

用设备 Cookie 和授权表记住本机已验证账号，登录页按确认样图做成门户，不再把密码写进浏览器。

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

backend/features/accounts/application.py

@@ -28,11 +28,11 @@ class AccountApplicationMixin:
     def update_membership(self, payload: dict[str, Any]) -> None:
         self.accounts.update_membership(payload)
 
-    def register_account(self, username: str, password: str) -> dict[str, Any]:
-        return self.accounts.register(username, password)
+    def register_account(self, username: str, password: str, device_hash: str = "") -> dict[str, Any]:
+        return self.accounts.register(username, password, device_hash)
 
-    def login_account(self, username: str, password: str) -> dict[str, Any]:
-        return self.accounts.login(username, password)
+    def login_account(self, username: str, password: str, device_hash: str = "") -> dict[str, Any]:
+        return self.accounts.login(username, password, device_hash)
 
     def change_password(self, current_password: str, new_password: str) -> None:
         self.accounts.change_password(current_password, new_password)

backend/features/accounts/http.py

@@ -1,49 +1,108 @@
 from __future__ import annotations
 
 import json
+import secrets
 from http import HTTPStatus
 
+from backend.features.accounts.security import token_hash
+
 
 class AccountHttpMixin:
+    def _device_hash(self) -> str:
+        raw = self.device_token()
+        return token_hash(raw) if raw else ""
+
+    def _ensure_device_token(self) -> str:
+        return self.device_token() or secrets.token_urlsafe(32)
+
+    def _auth_success_headers(self, session_token: str, device_raw: str) -> list[tuple[str, str]]:
+        return [
+            ("Set-Cookie", self.session_cookie(session_token)),
+            ("Set-Cookie", self.device_cookie(device_raw)),
+        ]
+
+    def _send_authenticated_session(self, result: dict, status: HTTPStatus, device_raw: str) -> None:
+        self.send_json(
+            {
+                "ok": True,
+                "authenticated": True,
+                "user": result["user"],
+                "csrf_token": result["csrf_token"],
+            },
+            status,
+            self._auth_success_headers(result["session_token"], device_raw),
+        )
+
     def auth_register(self) -> None:
         try:
             body = self.read_json_body()
+            device_raw = self._ensure_device_token()
             result = self.application_service.register_account(
                 str(body.get("username") or ""),
                 str(body.get("password") or ""),
+                token_hash(device_raw),
             )
-            self.send_json(
-                {
-                    "ok": True,
-                    "authenticated": True,
-                    "user": result["user"],
-                    "csrf_token": result["csrf_token"],
-                },
-                HTTPStatus.CREATED,
-                {"Set-Cookie": self.session_cookie(result["session_token"])},
-            )
+            self._send_authenticated_session(result, HTTPStatus.CREATED, device_raw)
         except (ValueError, json.JSONDecodeError) as exc:
             self.send_json({"error": str(exc)}, HTTPStatus.BAD_REQUEST)
 
     def auth_login(self) -> None:
         try:
             body = self.read_json_body()
+            device_raw = self._ensure_device_token()
             result = self.application_service.login_account(
                 str(body.get("username") or ""),
                 str(body.get("password") or ""),
+                token_hash(device_raw),
             )
-            self.send_json(
-                {
-                    "ok": True,
-                    "authenticated": True,
-                    "user": result["user"],
-                    "csrf_token": result["csrf_token"],
-                },
-                headers={"Set-Cookie": self.session_cookie(result["session_token"])},
-            )
+            self._send_authenticated_session(result, HTTPStatus.OK, device_raw)
         except (ValueError, json.JSONDecodeError) as exc:
             self.send_json({"error": str(exc)}, HTTPStatus.UNAUTHORIZED)
 
+    def auth_accounts(self) -> None:
+        current_user_id = None
+        if self.require_auth(send_error=False):
+            current_user_id = int(self.auth_user["id"])
+        payload = self.application_service.accounts.list_device_accounts(
+            self._device_hash(),
+            current_user_id,
+        )
+        self.send_json({"ok": True, **payload})
+
+    def auth_switch(self) -> None:
+        try:
+            body = self.read_json_body()
+            try:
+                user_id = int(body.get("user_id"))
+            except (TypeError, ValueError):
+                user_id = 0
+            device_raw = self.device_token()
+            result = self.application_service.accounts.switch_account(
+                token_hash(device_raw) if device_raw else "",
+                user_id,
+            )
+            self._send_authenticated_session(
+                result,
+                HTTPStatus.OK,
+                device_raw or self._ensure_device_token(),
+            )
+        except PermissionError as exc:
+            self.send_json({"error": str(exc)}, HTTPStatus.UNAUTHORIZED)
+        except (ValueError, json.JSONDecodeError) as exc:
+            self.send_json({"error": str(exc)}, HTTPStatus.BAD_REQUEST)
+
+    def auth_forget(self) -> None:
+        try:
+            body = self.read_json_body()
+            try:
+                user_id = int(body.get("user_id"))
+            except (TypeError, ValueError):
+                user_id = 0
+            self.application_service.accounts.forget_account(self._device_hash(), user_id)
+        except (ValueError, json.JSONDecodeError):
+            pass
+        self.send_json({"ok": True})
+
     def auth_me(self) -> None:
         service = self.application_service
         if not self.require_auth(send_error=False):
@@ -55,6 +114,15 @@ class AccountHttpMixin:
                 }
             )
             return
+        headers = None
+        if not self.device_token():
+            device_raw = secrets.token_urlsafe(32)
+            service.accounts.remember_account(
+                token_hash(device_raw),
+                int(self.auth_user["id"]),
+                fresh=True,
+            )
+            headers = [("Set-Cookie", self.device_cookie(device_raw))]
         self.send_json(
             {
                 "ok": True,
@@ -66,15 +134,19 @@ class AccountHttpMixin:
                     "membership": service.membership(),
                 },
                 "csrf_token": str(self.auth_user["csrf_token"]),
-            }
+            },
+            headers=headers,
         )
 
     def auth_logout(self) -> None:
         raw_token = self.session_token()
+        user_id = int(getattr(self, "auth_user", {}).get("id") or 0)
         if raw_token:
-            from backend.features.accounts.security import token_hash
-
             self.application_service.database.delete_session(token_hash(raw_token))
+        self.application_service.accounts.revoke_current_device_grant(
+            self._device_hash(),
+            user_id,
+        )
         self.send_json(
             {"ok": True},
             headers={"Set-Cookie": self.session_cookie("", clear=True)},

backend/features/accounts/repository.py

@@ -234,3 +234,96 @@ class AccountRepositoryMixin:
                 (user_id,),
             )
             return cursor.rowcount > 0
+
+    def cleanup_expired_switch_grants(self, now: str) -> int:
+        with self.connect() as connection:
+            cursor = connection.execute(
+                "DELETE FROM account_switch_grants WHERE expires_at <= ?",
+                (now,),
+            )
+        return int(cursor.rowcount)
+
+    def list_switch_grants(self, device_hash: str, now: str) -> list[dict[str, Any]]:
+        with self.connect() as connection:
+            rows = connection.execute(
+                """
+                SELECT u.id, u.username, u.role, u.llm_mode, u.membership_status,
+                       u.membership_plan, u.membership_starts_at, u.membership_expires_at,
+                       u.created_at, g.last_used_at, g.granted_at, g.expires_at
+                FROM account_switch_grants AS g
+                JOIN users AS u ON u.id = g.user_id
+                WHERE g.device_hash = ? AND g.expires_at > ?
+                ORDER BY g.last_used_at DESC, g.id DESC
+                """,
+                (device_hash, now),
+            ).fetchall()
+        return [dict(row) for row in rows]
+
+    def get_switch_grant(self, device_hash: str, user_id: int) -> dict[str, Any] | None:
+        with self.connect() as connection:
+            row = connection.execute(
+                """
+                SELECT device_hash, user_id, granted_at, last_used_at, expires_at
+                FROM account_switch_grants
+                WHERE device_hash = ? AND user_id = ?
+                """,
+                (device_hash, user_id),
+            ).fetchone()
+        return dict(row) if row else None
+
+    def upsert_switch_grant(
+        self,
+        device_hash: str,
+        user_id: int,
+        granted_at: str,
+        last_used_at: str,
+        expires_at: str,
+    ) -> None:
+        with self.connect() as connection:
+            connection.execute(
+                """
+                INSERT INTO account_switch_grants
+                    (device_hash, user_id, granted_at, last_used_at, expires_at)
+                VALUES (?, ?, ?, ?, ?)
+                ON CONFLICT(device_hash, user_id) DO UPDATE SET
+                    granted_at = excluded.granted_at,
+                    last_used_at = excluded.last_used_at,
+                    expires_at = excluded.expires_at
+                """,
+                (device_hash, user_id, granted_at, last_used_at, expires_at),
+            )
+
+    def prune_switch_grants(self, device_hash: str, keep: int) -> int:
+        with self.connect() as connection:
+            rows = connection.execute(
+                """
+                SELECT id FROM account_switch_grants
+                WHERE device_hash = ?
+                ORDER BY last_used_at DESC, id DESC
+                """,
+                (device_hash,),
+            ).fetchall()
+            extra = [int(row["id"]) for row in rows[keep:]]
+            if not extra:
+                return 0
+            connection.execute(
+                f"DELETE FROM account_switch_grants WHERE id IN ({','.join('?' * len(extra))})",
+                extra,
+            )
+        return len(extra)
+
+    def delete_switch_grant(self, device_hash: str, user_id: int) -> bool:
+        with self.connect() as connection:
+            cursor = connection.execute(
+                "DELETE FROM account_switch_grants WHERE device_hash = ? AND user_id = ?",
+                (device_hash, user_id),
+            )
+        return cursor.rowcount > 0
+
+    def delete_switch_grants_for_user(self, user_id: int) -> int:
+        with self.connect() as connection:
+            cursor = connection.execute(
+                "DELETE FROM account_switch_grants WHERE user_id = ?",
+                (user_id,),
+            )
+        return int(cursor.rowcount)

backend/features/accounts/routes.py

@@ -6,6 +6,9 @@ class AccountRoutesMixin:
         if parsed.path == "/api/auth/me":
             self.auth_me()
             return True
+        if parsed.path == "/api/auth/accounts":
+            self.auth_accounts()
+            return True
         return False
 
     def _handle_accounts_get(self, parsed) -> bool:

backend/features/accounts/service.py

@@ -77,15 +77,22 @@ class AccountService:
         access = self.access_supplier() or self.database.user_access(self.current_user_id) or {}
         return self.membership_for_access(access)
 
-    def register(self, username: str, password: str) -> dict[str, Any]:
+    GRANT_SLIDE_DAYS = 30
+    GRANT_HARD_DAYS = 180
+    MAX_GRANTS_PER_DEVICE = 5
+    SWITCH_REAUTH_MESSAGE = "该账号需重新验证"
+
+    def register(self, username: str, password: str, device_hash: str = "") -> dict[str, Any]:
         username = username.strip()
         self.validate_input(username, password)
         with self.auth_lock:
             salt, password_digest = hash_password(password)
             user = self.database.create_user(username, salt, password_digest)
-        return self.create_session(user)
+        result = self.create_session(user)
+        self.remember_account(device_hash, int(user["id"]), fresh=True)
+        return result
 
-    def login(self, username: str, password: str) -> dict[str, Any]:
+    def login(self, username: str, password: str, device_hash: str = "") -> dict[str, Any]:
         username = username.strip()
         if not username or not password:
             raise ValueError("账号名和密码不能为空。")
@@ -96,7 +103,9 @@ class AccountService:
             str(user.get("password_hash") or ""),
         ):
             raise ValueError("账号名或密码不正确。")
-        return self.create_session(user)
+        result = self.create_session(user)
+        self.remember_account(device_hash, int(user["id"]), fresh=True)
+        return result
 
     def change_password(self, current_password: str, new_password: str) -> None:
         current_password = str(current_password or "")
@@ -112,6 +121,86 @@ class AccountService:
         salt, digest = hash_password(new_password)
         if not self.database.update_user_password(self.current_user_id, salt, digest):
             raise ValueError("账号不存在。")
+        self.database.delete_switch_grants_for_user(self.current_user_id)
+
+    @staticmethod
+    def _utc_now() -> datetime:
+        return datetime.now(timezone.utc)
+
+    @classmethod
+    def _iso(cls, value: datetime) -> str:
+        return value.isoformat(timespec="seconds")
+
+    def remember_account(self, device_hash: str, user_id: int, *, fresh: bool = False) -> None:
+        if not device_hash or user_id <= 0:
+            return
+        now = self._utc_now()
+        now_text = self._iso(now)
+        self.database.cleanup_expired_switch_grants(now_text)
+        existing = None if fresh else self.database.get_switch_grant(device_hash, user_id)
+        granted_at = parse_iso_datetime(existing["granted_at"]) if existing else now
+        if granted_at is None:
+            granted_at = now
+        expires = min(
+            now + timedelta(days=self.GRANT_SLIDE_DAYS),
+            granted_at + timedelta(days=self.GRANT_HARD_DAYS),
+        )
+        if not existing:
+            self.database.prune_switch_grants(device_hash, self.MAX_GRANTS_PER_DEVICE - 1)
+        self.database.upsert_switch_grant(
+            device_hash,
+            user_id,
+            self._iso(granted_at),
+            now_text,
+            self._iso(expires),
+        )
+
+    def list_device_accounts(
+        self, device_hash: str, current_user_id: int | None = None
+    ) -> dict[str, Any]:
+        if not device_hash:
+            return {"accounts": [], "current_user_id": current_user_id}
+        now_text = self._iso(self._utc_now())
+        self.database.cleanup_expired_switch_grants(now_text)
+        accounts = []
+        for row in self.database.list_switch_grants(device_hash, now_text):
+            accounts.append(
+                {
+                    "user_id": int(row["id"]),
+                    "username": str(row["username"]),
+                    "role": str(row.get("role") or "user"),
+                    "membership": self.membership_for_access(row),
+                    "last_used_at": str(row.get("last_used_at") or ""),
+                }
+            )
+        return {"accounts": accounts, "current_user_id": current_user_id}
+
+    def switch_account(self, device_hash: str, user_id: int) -> dict[str, Any]:
+        if not device_hash or user_id <= 0:
+            raise PermissionError(self.SWITCH_REAUTH_MESSAGE)
+        now = self._utc_now()
+        now_text = self._iso(now)
+        self.database.cleanup_expired_switch_grants(now_text)
+        grant = self.database.get_switch_grant(device_hash, user_id)
+        expires = parse_iso_datetime(grant.get("expires_at")) if grant else None
+        if not grant or not expires or expires <= now:
+            if grant:
+                self.database.delete_switch_grant(device_hash, user_id)
+            raise PermissionError(self.SWITCH_REAUTH_MESSAGE)
+        user = self.database.user_access(user_id)
+        if not user:
+            raise PermissionError(self.SWITCH_REAUTH_MESSAGE)
+        result = self.create_session(user)
+        self.remember_account(device_hash, user_id)
+        return result
+
+    def forget_account(self, device_hash: str, user_id: int) -> None:
+        if device_hash and user_id > 0:
+            self.database.delete_switch_grant(device_hash, user_id)
+
+    def revoke_current_device_grant(self, device_hash: str, user_id: int) -> None:
+        if device_hash and user_id > 0:
+            self.database.delete_switch_grant(device_hash, user_id)
 
     def create_session(self, user: dict[str, Any]) -> dict[str, Any]:
         session_token = secrets.token_urlsafe(32)