fastapi+react实现第三方登录功能示例
介绍
推荐:一个实现各个平台OAuth2的GitHub开源项目
实现使用第三方登录功能(例如 Google、GitHub、WeChat 等)通常涉及前后端的协同工作。
以下是一个基本的实现方案,使用 FastAPI 作为后端,React 作为前端。
后端(FastAPI)
用 PostgreSQL 作为数据库,并且登录 URL 将从后端动态获取。以下是详细的实现步骤:
-
安装依赖
pip install fastapi uvicorn httpx python-jose passlib bcrypt sqlalchemy psycopg2
-
配置 PostgreSQL 数据库
from sqlalchemy import create_engine from sqlalchemy.ext.declarative import declarative_base from sqlalchemy.orm import sessionmaker SQLALCHEMY_DATABASE_URL = "postgresql://user:password@localhost/dbname" engine = create_engine(SQLALCHEMY_DATABASE_URL) SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine) Base = declarative_base()
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创建 FastAPI 应用
from fastapi import FastAPI, HTTPException, Depends, Request from fastapi.security import OAuth2PasswordBearer from sqlalchemy import create_engine, Column, Integer, String, ForeignKey from sqlalchemy.ext.declarative import declarative_base from sqlalchemy.orm import sessionmaker, relationship from passlib.context import CryptContext from jose import JWTError, jwt import httpx app = FastAPI() # 数据库配置 SQLALCHEMY_DATABASE_URL = "postgresql://user:password@localhost/dbname" engine = create_engine(SQLALCHEMY_DATABASE_URL) SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine) Base = declarative_base() # 密码加密 pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto") # JWT 配置 SECRET_KEY = "your-secret-key" ALGORITHM = "HS256" # OAuth2 配置 oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token") class User(Base): __tablename__ = "users" id = Column(Integer, primary_key=True, index=True) email = Column(String, unique=True, index=True) hashed_password = Column(String) oauth_accounts = relationship("OAuthAccount", back_populates="user") class OAuthAccount(Base): __tablename__ = "oauth_accounts" id = Column(Integer, primary_key=True, index=True) user_id = Column(Integer, ForeignKey("users.id")) provider = Column(String, index=True) provider_id = Column(String, index=True) user = relationship("User", back_populates="oauth_accounts") Base.metadata.create_all(bind=engine) def get_db(): db = SessionLocal() try: yield db finally: db.close() async def get_current_user(token: str = Depends(oauth2_scheme)): credentials_exception = HTTPException(status_code=401, detail="Could not validate credentials") try: payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM]) email: str = payload.get("sub") if email is None: raise credentials_exception except JWTError: raise credentials_exception db = next(get_db()) user = db.query(User).filter(User.email == email).first() if user is None: raise credentials_exception return user @app.post("/token") async def login_for_access_token(form_data: OAuth2PasswordRequestForm = Depends()): db = next(get_db()) user = authenticate_user(db, form_data.username, form_data.password) if not user: raise HTTPException(status_code=400, detail="Incorrect username or password") access_token = create_access_token(data={"sub": user.email}) return {"access_token": access_token, "token_type": "bearer"} def authenticate_user(db, email: str, password: str): user = db.query(User).filter(User.email == email).first() if not user: return False if not verify_password(password, user.hashed_password): return False return user def verify_password(plain_password, hashed_password): return pwd_context.verify(plain_password, hashed_password) def create_access_token(data: dict): to_encode = data.copy() encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM) return encoded_jwt @app.get("/users/me") async def read_users_me(current_user: User = Depends(get_current_user)): return current_user @app.get("/oauth/{provider}/login-url") async def get_oauth_login_url(provider: str): redirect_uri = "http://localhost:3000/oauth/{provider}/callback" if provider == "google": return { "url": f"https://accounts.google.com/o/oauth2/v2/auth?client_id=your-google-client-id&redirect_uri={redirect_uri}&response_type=code&scope=email profile" } elif provider == "github": return { "url": f"https://github.com/login/oauth/authorize?client_id=your-github-client-id&redirect_uri={redirect_uri}&scope=user:email" } elif provider == "wechat": return { "url": f"https://open.weixin.qq.com/connect/qrconnect?appid=your-wechat-app-id&redirect_uri={redirect_uri}&response_type=code&scope=snsapi_login" } else: raise HTTPException(status_code=404, detail="Provider not found") @app.get("/oauth/{provider}/callback") async def oauth_callback(provider: str, request: Request): code = request.query_params.get("code") if not code: raise HTTPException(status_code=400, detail="Missing code") # 获取 access_token async with httpx.AsyncClient() as client: response = await client.post(f"https://{provider}.com/oauth/token", data={ "client_id": "your-client-id", "client_secret": "your-client-secret", "code": code, "redirect_uri": "your-redirect-uri" }) token_data = response.json() access_token = token_data.get("access_token") # 获取用户信息 async with httpx.AsyncClient() as client: response = await client.get(f"https://{provider}.com/user", headers={"Authorization": f"Bearer {access_token}"}) user_data = response.json() db = next(get_db()) oauth_account = db.query(OAuthAccount).filter(OAuthAccount.provider == provider, OAuthAccount.provider_id == user_data["id"]).first() if oauth_account: user = oauth_account.user else: user = db.query(User).filter(User.email == user_data["email"]).first() if not user: user = User(email=user_data["email"], hashed_password=pwd_context.hash("default_password")) db.add(user) db.commit() db.refresh(user) oauth_account = OAuthAccount(provider=provider, provider_id=user_data["id"], user=user) db.add(oauth_account) db.commit() db.refresh(oauth_account) access_token = create_access_token(data={"sub": user.email}) return {"access_token": access_token, "token_type": "bearer"}
前端(React)
-
安装依赖
npm install axios react-router-dom
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创建 React 组件
import React from 'react'; import { BrowserRouter as Router, Route, Switch, Link } from 'react-router-dom'; import axios from 'axios'; const Login = () => { const [loginUrls, setLoginUrls] = React.useState({}); React.useEffect(() => { const fetchLoginUrls = async () => { const providers = ['google', 'github', 'wechat']; const urls = {}; for (const provider of providers) { const response = await axios.get(`/oauth/${provider}/login-url`); urls[provider] = response.data.url; } setLoginUrls(urls); }; fetchLoginUrls(); }, []); const handleLogin = (provider) => { window.location.href = loginUrls[provider]; }; return ( <div> <button onClick={() => handleLogin('google')}>Login with Google</button> <button onClick={() => handleLogin('github')}>Login with GitHub</button> <button onClick={() => handleLogin('wechat')}>Login with WeChat</button> </div> ); }; const Callback = ({ match }) => { const { provider } = match.params; React.useEffect(() => { const params = new URLSearchParams(window.location.search); const code = params.get('code'); axios.get(`/oauth/${provider}/callback?code=${code}`) .then(response => { const { access_token } = response.data; localStorage.setItem('access_token', access_token); window.location.href = '/profile'; }) .catch(error => { console.error(error); }); }, [provider]); return <div>Loading...</div>; }; const Profile = () => { const [user, setUser] = React.useState(null); React.useEffect(() => { const access_token = localStorage.getItem('access_token'); axios.get('/users/me', { headers: { Authorization: `Bearer ${access_token}` } }) .then(response => { setUser(response.data); }) .catch(error => { console.error(error); }); }, []); if (!user) return <div>Loading...</div>; return ( <div> <h1>Profile</h1> <p>Email: {user.email}</p> </div> ); }; const App = () => { return ( <Router> <nav> <Link to="/">Home</Link> <Link to="/profile">Profile</Link> </nav> <Switch> <Route path="/" exact component={Login} /> <Route path="/oauth/:provider/callback" component={Callback} /> <Route path="/profile" component={Profile} /> </Switch> </Router> ); }; export default App;
总结
- 后端:使用 FastAPI 处理 OAuth2 回调,获取用户信息,并将其与现有用户关联或创建新用户。同时,提供动态获取登录 URL 的接口。
- 前端:使用 React 处理登录按钮和回调逻辑,从后端动态获取登录 URL,并将获取的
access_token
存储在localStorage
中,并在用户访问个人资料页面时使用该access_token
获取用户信息。
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