无法读取 null + passport.js 的属性“正文”

Question

我正在尝试在 Node/Express/Sequelize 应用程序中实现 passport.js。我试图尽可能忠实于the official documentation 和Scotch.io tutorial，目前我的脚手架中有以下相关代码段：

app.js

const express = require('express');
const http = require('http');
const https = require('https');
const sequelize = require('sequelize');
const db = require('./config/sequelize');
const config = require('./config/config');
const passport = require('./config/passport');

const app = express();

const port = 3000;

app.use(passport.initialize());
app.use(passport.session());
app.set('view engine', 'ejs');

app.listen(port);

app.post('/signup', passport.authenticate('local', function(req, res, next, err){
    if (err) { console.log(err); }
    res.json(req.body);
})); 

./config/passport.js

const db = require('./sequelize');

const passport = require('passport'), 
LocalStrategy = require('passport-local').Strategy;

passport.serializeUser(function(user, done) {
    done(null, user.id);
});

passport.deserializeUser(function(user, done) {
    db.User.findById(id, function(err, user) {
        done(err, user);
    });
});

passport.use('local', new LocalStrategy({
    usernameField : 'email',
    passwordField : 'password',
    passReqToCallback : true  
    }, 
    function(email, password, done){
        process.nextTick(function() {
            db.User.findOne({ email : 'local.email' }, function(err, user) {
                if (err)
                    return done(err);
                if (user) {
                    return done(null, false, req.flash('signupMessage', 'That email is already taken.'));
                } 
                else {
                    db.User.create({
                        username: 'local.email',
                        password: 'local.password'
                    });
                }
            });    
         });
      }
 ));

 module.exports = passport;

./views/signup.ejs

<!-- LOGIN FORM -->
<form action="/signup" method="post">
    <div class="form-group">
        <label>Email</label>
        <input type="text" name="username">
    </div>
    <div class="form-group">
        <label>Password</label>
        <input type="password" name="password">
    </div>

    <button type="submit">Signup</button>
</form>

有了这个实现，我启动应用程序，输入电子邮件地址和密码以在 ./views/signup.ejs 上注册，然后收到以下错误：

TypeError: Cannot read property 'body' of null
at C:\Users\Adam\Desktop\repos\chinese-democracy\app.js:45:15
at allFailed (C:\Users\Adam\Desktop\repos\chinese-democracy\node_modules\passport\lib\middleware\authenticate.js:94:18)
at attempt (C:\Users\Adam\Desktop\repos\chinese-democracy\node_modules\passport\lib\middleware\authenticate.js:167:28)
...

这表明 req.body 被返回为 null，我怀疑它与 deserializeUser 和 serializeUser 函数在 ./config/passport.js 中定义的方式有关，但我怎样才能得到详细的错误输出以确定确切的原因是什么？此外，我已经对我的 Sequelize 数据库进行了健全的 CRUD 检查，因此我省略了该文件，但如果你们中的任何人认为这对解决此问题有用，我会将其作为编辑提供。

Answer 1

请在您的app.js 中试试这个：

app.post('/signup', passport.authenticate('local'), function(req, res, next, err){
                                               //^ close
    // If this function gets called, authentication was successful.
    res.redirect('/users/' + req.user.username);
}); 

如果您需要自定义回调：

app.post('/signup', function(req, res, next){
    passport.authenticate('local', function(err, user, info) {
       //Your code here       
    })(req, res, next);
}); 

详情请咨询http://passportjs.org/docs/authenticate。