ForbiddenError：无效的 csrf 令牌，表达 js 但存储在数据库中

编程问答 2022-05-11

问题描述

我试图让 csurf 工作，但似乎偶然发现了一些东西。到目前为止的代码如下所示：

index.ejs

<form method="post" action="/add">
        <input type="hidden" name="_csrf" value="<%= csrftoken %>"></form>

app.js

    var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
const mongoose = require('mongoose');
var session = require('express-session');
var MongoDBStore = require('connect-mongodb-session')(session);
var flash        = require('req-flash');
var multer  = require('multer');
var csrf = require('csurf');
var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var store = new MongoDBStore ({
  uri: 'mongodb+srv:',collection: 'my Session'
});

var app = express();

// view engine setup
app.set('views',path.join(__dirname,'views'));
app.set('view engine','ejs');

var csrfProtection  = csrf({});

app.use(session({
  secret: 'keyboard cat',resave: false,saveUninitialized: false,store: store,// cookie: { secure: true }
}))

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname,'public')));
app.use('/images',express.static(path.join(__dirname,'images')));

app.use(csrfProtection);
app.use(flash());

app.use('/',indexRouter);
app.use('/users',usersRouter);

// catch 404 and forward to error handler
app.use(function(req,res,next) {
  next(createError(404));
});

// error handler
app.use(function(err,req,next) {
  // set locals,only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

index.js

exports.getStudent = (req,next) => {
Student.find()
.then(students => {
    console.log(students);
    res.render('studentList',{
        studentlist: students,title : 'Student List',path: '/studentList',isAuth : req.session.isLoggedIn,csrftoken : req.csrftoken()
    });
    // console.log( req.session.isLoggedIn,'32')
})

};

提交表单后得到的结果，无论我输入的用户名和密码是否正确，仍然出现相同的错误：

无效的 csrf 令牌

403

禁止错误：无效的 csrf 令牌

解决方法

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csrf-tokenexpressexpressexpressjavascriptmongodbmongodb