94 lines
3.0 KiB
Python
94 lines
3.0 KiB
Python
from datetime import datetime, timedelta
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from typing import Optional
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from fastapi import Depends, Request
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from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
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from jose import JWTError, jwt
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from passlib.context import CryptContext
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from core.exceptions import PermissionsError, TokenAuthFailure
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from dbhelper.menu import get_apis
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from dbhelper.user import get_user, get_user_info
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from models import UserModel
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# JWT
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SECRET_KEY = "lLNiBWPGiEmCLLR9kRGidgLY7Ac1rpSWwfGzTJpTmCU"
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ALGORITHM = "HS256"
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ACCESS_TOKEN_EXPIRE_MINUTES = 60 * 24 * 7
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pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
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bearer = HTTPBearer()
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def verify_password(plain_password: str, hashed_password: str) -> bool:
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"""
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验证明文密码 vs hash密码
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:param plain_password: 明文密码
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:param hashed_password: hash密码
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:return:
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"""
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return pwd_context.verify(plain_password, hashed_password)
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def get_password_hash(password: str) -> str:
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"""
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加密明文
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:param password: 明文密码
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:return:
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"""
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return pwd_context.hash(password)
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def generate_token(username: str, expires_delta: Optional[timedelta] = None):
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"""生成token"""
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to_encode = {"sub": username}.copy()
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if expires_delta:
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expire = datetime.utcnow() + expires_delta
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else:
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expire = datetime.utcnow() + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
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to_encode.update(dict(exp=expire))
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encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
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return encoded_jwt
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async def check_token(security: HTTPAuthorizationCredentials = Depends(bearer)):
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"""检查用户token"""
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token = security.credentials
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try:
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payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
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username: str = payload.get("sub")
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return await get_user({"username": username})
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except JWTError:
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raise TokenAuthFailure(403, "认证失败")
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async def check_permissions(request: Request, user: UserModel = Depends(check_token)):
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"""检查接口权限"""
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# 查询当前激活角色
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result = await get_user_info(user)
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active_rid = result["roles"][0]["id"]
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# 白名单 登录用户信息， 登录用户菜单信息
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whitelist = [(f"/user/{user.id}", "GET"), (f"/role/{active_rid}/menu", "GET")] + [
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(f"/user/role/{rid['id']}", "PUT") for rid in result["roles"]
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]
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if (request.url.path, request.method) in whitelist:
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return user
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api = request.url.path
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for k, v in request.path_params.items():
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api = api.replace(v, "{%s}" % k)
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# 2. 登录之后查一次 后面去结果查 todo 更新权限时需要更新 , 最好结果放redis
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cache_key = f"{user.username}_{active_rid}"
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# 缓存到fastapi 应用实例中
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if not hasattr(request.app.state, cache_key):
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setattr(request.app.state, cache_key, await get_apis(active_rid))
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if {"api": api, "method": request.method} not in getattr(
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request.app.state, cache_key
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):
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raise PermissionsError(403, detail="无权访问")
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