为什么对每个请求都执行 passport.serializeUser？

Question

我正在使用 passport.js + passport-facebook-token 来保护我使用 Strongloop 的 Loopback Framework 构建的 API。

为什么passport反序列化成功后又要对反序列化的用户进行序列化？每个请求都会调用 passport.authenticate 方法！我做错了什么？

这是节点的日志：

deserializeUser, id: XXXXXXXXXXXXXXXX
User found.
serializeUser, id: XXXXXXXXXXXXXXXX
GET /api/events?access_token=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 304 182ms

这里是js代码：

passport.use(new FacebookTokenStrategy({
    clientID: XXXXXXXXXXXXXXXX,
    clientSecret: 'XXXXXXXXXXXXXXXXXXXXXXXXXXXX'
  },
  function(accessToken, refreshToken, profile, done) {
    //check user table for anyone with a facebook ID of profile.id
    User.findOne({
      'facebookId': profile.id
    }, function(err, user) {
      if (err) {
        return done(err);
      }
      if (user) {
        console.log("User found.");
        return done(err, user);
      } else {
        console.log("User not found.");
        User.create({
          email: profile.emails[0].value,
          facebookId: profile.id,
          password: 'secret'
        }, function(err, user) {
          console.log(user.id);
          console.log(user.email);
          console.log(user.facebookId);
          console.log("User created");
          return done(err, user);
        });
      }
    });
  }));

passport.serializeUser(function(user, done) {
  console.log('serializeUser, id: ' + user.facebookId);
  done(null, user.facebookId);
});

passport.deserializeUser(function(id, done) {
  console.log('deserializeUser, id: ' + id);
  User.findOne({
    'facebookId': id
  }, function(err, user) {
    if (!err) {
      done(null, user);
    } else {
      done(err, user);
    }
  });
});

Answer 1

关于您关于为什么在每个请求上调用passport.authenticate 的问题，这是因为您可能在任何路由逻辑发生之前将其定义为中间件。

如果你的应用有私有和公共部分，你可以这样做：

// Define a specific that will handle authentication logic
app.get("/auth", passport.authenticate('facebook-token',function(){...});

// Public sections which do not require authentication
app.get("/public1",...);
app.post("/public2",...);

// Private sections which do require authentication
app.get("/private1", function(req,res,next){
   if (req.isAuthenticated()){ // Check if user is authenticated
       // do things...
   }else{ // Wow, this guy is not authenticated. Kick him out of here !
       res.redirect("/auth");
   }
});

现在，如果您有多个私人部分，您可能会发现为每个私人部分做同样的事情有点繁琐。 您可以定义一个自定义函数来检查用户是否已通过身份验证，如果是，则允许请求继续进行。 类似的东西

function isThisGuyAuthenticated(req,res,next){
   if (req.isAuthenticated()){
      return next(); // Ok this guy is clean, please go on !
   }else{
      res.redirect("/auth"); // This guy is shady, please authenticate !
   }
}

并像这样使用它：

app.get("/private1",isThisGuyAuthenticated, doCrazySecretStuff); // doCrazySecretStuff will not be called if the user is not authenticated
app.get("/private2", isThisGuyAuthenticated, getCocaColaRecipe);
app.get("/private3", isThisGuyAuthenticated, flyToMars);
app.get("/public", showInfo); // showInfo will be called whether the user is authenticated or not

现在，如果您的应用只有私有部分，您可以通过将 isThisGuyAuthenticated 定义为中间件来避免重复调用它（但不能将 passport.authenticate 本身定义为中间件！）；

// Endpoint that will be hit is the user is redirected to /auth
// BEWARE it needs to be above the middleware, otherwise you'll end up with an infinite redirection loop
app.get("/auth", passport.authenticate('facebook-token',function(){...});

// Middleware that will be called on every request
app.use(isThisGuyAuthenticated);

// You app's endpoints
app.get("/private1", doCrazySecretStuff); // doCrazySecretStuff will not be called if the user is not authenticated
app.get("/private2", getCocaColaRecipe);
app.get("/private3", flyToMars);

清楚吗？

EDIT ：我错误地将中间件放在“/auth”端点之前。确保它放置在

之后