dingdanquanliucheng/backend/app/services/auth_service.py

import json
from datetime import datetime, timezone
from pathlib import Path

from sqlalchemy.exc import SQLAlchemyError
from sqlalchemy.orm import Session

from backend.app.core.config import get_settings
from backend.app.core.error_codes import ErrorCode
from backend.app.core.exceptions import AppException
from backend.app.core.security import create_access_token, decode_access_token, verify_password
from backend.app.repositories.system_repository import SystemRepository
from backend.app.services.demo_store import demo_store


class AuthService:
    DEFAULT_ROLE_MENUS = {
        "salesman": [{"menu_name": "我的订单", "menu_path": "/orders"}],
        "manager": [{"menu_name": "审批中心", "menu_path": "/pages/approve-list"}],
        "driver": [{"menu_name": "我的任务", "menu_path": "/pages/task-list"}],
        "admin": [{"menu_name": "后台首页", "menu_path": "/dashboard"}],
    }

    DEFAULT_ROLE_PERMISSIONS = {
        "salesman": ["order:create", "order:list", "order:submit", "customer:list"],
        "manager": [
            "order:list",
            "order:approve",
            "order:cancel-approve",
            "logistics:task:list",
            "logistics:task:create",
            "logistics:trace:list",
            "logistics:trace:create",
            "report:performance:view",
            "report:performance:export",
            "ai:recognize",
            "ai:correct",
        ],
        "driver": [
            "driver:task:list",
            "driver:task:accept",
            "driver:task:pickup",
            "driver:task:deliver",
            "logistics:trace:list",
        ],
        "admin": [
            "system:view",
            "system:user:list",
            "system:user:create",
            "system:user:update",
            "system:user:reset-password",
            "system:role:list",
            "system:role:create",
            "system:role:update",
            "system:role:assign-menus",
            "system:menu:list",
            "system:menu:create",
            "system:menu:update",
            "report:performance:view",
            "report:performance:export",
            "logistics:task:list",
            "logistics:task:create",
            "logistics:trace:list",
            "logistics:trace:create",
            "ai:recognize",
            "ai:correct",
            "order:list",
        ],
    }

    def __init__(self) -> None:
        self.repository = SystemRepository()
        self.settings = get_settings()
        self.token_store_path = Path(self.settings.auth_token_store_path)
        self.token_store_path.parent.mkdir(parents=True, exist_ok=True)
        self.revoked_tokens = self._load_revoked_tokens()

    def login(self, username: str, password: str, role_type: str, session: Session | None = None) -> dict | None:
        if session is not None:
            try:
                user = self.repository.get_user_by_username(session, username)
                if user is None or not verify_password(password, user.password_hash):
                    raise AppException(
                        code=ErrorCode.UNAUTHORIZED,
                        message="账号不存在或密码错误",
                        status_code=401,
                    )

                role = self.repository.get_role(session, user.role_id)
                if role is None:
                    raise AppException(code=ErrorCode.NOT_FOUND, message="角色不存在", status_code=404)
                if user.status != 1:
                    raise AppException(code=ErrorCode.FORBIDDEN, message="账号已停用", status_code=403)
                if role.status != 1 or role.role_code != role_type:
                    raise AppException(code=ErrorCode.FORBIDDEN, message="登录角色与账号不匹配", status_code=403)

                return self._build_profile(session, user, role, include_token=True)
            except AppException:
                raise
            except SQLAlchemyError:
                pass

        return demo_store.login(username, role_type)

    def get_me(self, token: str, session: Session | None = None) -> dict | None:
        if self._is_token_revoked(token):
            return None

        if session is not None:
            try:
                payload = decode_access_token(token)
                if payload is not None:
                    user_id = int(payload["user_id"])
                    role_code = str(payload["role_code"])
                    user = self.repository.get_user(session, user_id)
                    if user is None or user.status != 1:
                        return None
                    role = self.repository.get_role(session, user.role_id)
                    if role is None or role.status != 1 or role.role_code != role_code:
                        return None
                    return self._build_profile(session, user, role, include_token=False)
            except (SQLAlchemyError, ValueError, KeyError, TypeError):
                pass

        return demo_store.get_me(token)

    def logout(self, token: str) -> dict:
        if token:
            # token 失效需要跨进程持久化，避免服务重启后已退出的 token 又重新可用。
            self._revoke_token(token)
        return {"success": True}

    def _build_profile(self, session: Session, user, role, include_token: bool) -> dict:
        menus = self._load_role_menus(session, role.role_code)
        permissions = self._load_role_permissions(session, role.role_code)
        return {
            "user_id": user.id,
            "username": user.username,
            "real_name": user.real_name,
            "mobile": user.mobile,
            "role_id": role.id,
            "role_name": role.role_name,
            "role_code": role.role_code,
            "token": create_access_token({"user_id": user.id, "role_code": role.role_code}) if include_token else None,
            "menus": menus,
            "permissions": permissions,
        }

    def _load_role_menus(self, session: Session, role_code: str) -> list[dict]:
        menus = self.repository.list_menus(session, {"status": 1})
        if not menus:
            return self.DEFAULT_ROLE_MENUS.get(role_code, [])

        if role_code == "admin":
            return [{"menu_name": menu.menu_name, "menu_path": menu.menu_path} for menu in menus]

        role = self.repository.get_role_by_code(session, role_code)
        if role is not None:
            relations = self.repository.list_role_menu_relations(session, role.id)
            if relations:
                allowed_menu_ids = {item.menu_id for item in relations}
                filtered = [
                    {"menu_name": menu.menu_name, "menu_path": menu.menu_path}
                    for menu in menus
                    if menu.id in allowed_menu_ids and menu.menu_path
                ]
                if filtered:
                    return filtered

        allowed_paths = {item["menu_path"] for item in self.DEFAULT_ROLE_MENUS.get(role_code, [])}
        filtered = [
            {"menu_name": menu.menu_name, "menu_path": menu.menu_path}
            for menu in menus
            if menu.menu_path in allowed_paths
        ]
        return filtered or self.DEFAULT_ROLE_MENUS.get(role_code, [])

    def _load_role_permissions(self, session: Session, role_code: str) -> list[str]:
        menus = self.repository.list_menus(session, {"status": 1})
        if not menus:
            return self.DEFAULT_ROLE_PERMISSIONS.get(role_code, [])

        if role_code == "admin":
            permissions = [menu.permission_code for menu in menus if menu.permission_code]
            default_permissions = self.DEFAULT_ROLE_PERMISSIONS.get(role_code, [])
            merged = list(dict.fromkeys([*default_permissions, *permissions]))
            return merged or default_permissions

        role = self.repository.get_role_by_code(session, role_code)
        if role is not None:
            relations = self.repository.list_role_menu_relations(session, role.id)
            if relations:
                allowed_menu_ids = {item.menu_id for item in relations}
                permissions = [
                    menu.permission_code
                    for menu in menus
                    if menu.id in allowed_menu_ids and menu.permission_code
                ]
                if permissions:
                    return permissions

        allowed = set(self.DEFAULT_ROLE_PERMISSIONS.get(role_code, []))
        permissions = [menu.permission_code for menu in menus if menu.permission_code in allowed]
        return permissions or self.DEFAULT_ROLE_PERMISSIONS.get(role_code, [])

    def _load_revoked_tokens(self) -> dict[str, int]:
        if not self.token_store_path.exists():
            return {}
        try:
            payload = json.loads(self.token_store_path.read_text(encoding="utf-8"))
        except (OSError, json.JSONDecodeError):
            return {}
        now_ts = int(datetime.now(timezone.utc).timestamp())
        tokens = {
            token: int(exp)
            for token, exp in payload.items()
            if isinstance(token, str) and isinstance(exp, int) and exp > now_ts
        }
        if len(tokens) != len(payload):
            self._save_revoked_tokens(tokens)
        return tokens

    def _save_revoked_tokens(self, tokens: dict[str, int]) -> None:
        self.token_store_path.write_text(json.dumps(tokens, ensure_ascii=False, indent=2), encoding="utf-8")

    def _is_token_revoked(self, token: str) -> bool:
        if not token:
            return False
        now_ts = int(datetime.now(timezone.utc).timestamp())
        expired_tokens = [item for item, exp in self.revoked_tokens.items() if exp <= now_ts]
        if expired_tokens:
            for item in expired_tokens:
                self.revoked_tokens.pop(item, None)
            self._save_revoked_tokens(self.revoked_tokens)
        return token in self.revoked_tokens

    def _revoke_token(self, token: str) -> None:
        payload = decode_access_token(token)
        expire_at = int(payload.get("exp", 0)) if payload else int(datetime.now(timezone.utc).timestamp()) + 60
        self.revoked_tokens[token] = expire_at
        self._save_revoked_tokens(self.revoked_tokens)


auth_service = AuthService()