无法读取未定义的属性“isLoggedIn”
[英]Cannot read property 'isLoggedIn' of undefined
问题描述
此代码用于添加产品，然后在后端使用 mongodb 创建 pdf 的购物车和订单。 实际上 session.isLoggedIn 是在 auth js 检查代码中定义的，但仍然在 app.js 中它给出了这个错误！
app.JS 代码
const path = require('path');
const express = require('express');
const bodyParser = require('body-parser');
const mongoose = require('mongoose');
const session = require('express-session');
const MongoDBStore = require('connect-mongodb-session')(session);
const csrf = require('csurf');
const flash = require('connect-flash');
const multer = require('multer');
const errorController = require('./controllers/error');
const User = require('./models/user');
const MONGODB_URI =
'mongodb....url';
const app = express();
const store = new MongoDBStore({
uri: MONGODB_URI,
collection: 'sessions'
});
const csrfProtection = csrf();
const fileStorage = multer.diskStorage({
destination: (req, file, cb) => {
cb(null, 'images');
},
filename: (req, file, cb) => {
cb(null, new Date().toISOString() + '-' + file.originalname);
}
});
const fileFilter = (req, file, cb) => {
if (
file.mimetype === 'image/png' ||
file.mimetype === 'image/jpg' ||
file.mimetype === 'image/jpeg'
) {
cb(null, true);
} else {
cb(null, false);
}
};
app.set('view engine', 'ejs');
app.set('views', 'views');
const adminRoutes = require('./routes/admin');
const shopRoutes = require('./routes/shop');
const authRoutes = require('./routes/auth');
app.use(bodyParser.urlencoded({ extended: false }));
app.use(
multer({ storage: fileStorage, fileFilter: fileFilter }).single('image')
);
app.use(express.static(path.join(__dirname, 'public')));
app.use('/images', express.static(path.join(__dirname, 'images')));
app.use(
session({
secret: 'my secret',
resave: false,
saveUninitialized: false,
store: store
})
);
app.use(csrfProtection);
app.use(flash());
app.use((req, res, next) => {
res.locals.isAuthenticated = req.session.isLoggedIn;
res.locals.csrfToken = req.csrfToken();
next();
});
app.use((req, res, next) => {
// throw new Error('Sync Dummy');
if (!req.session.user) {
return next();
}
User.findById(req.session.user._id)
.then(user => {
if (!user) {
return next();
}
req.user = user;
next();
})
.catch(err => {
next(new Error(err));
});
});
app.use('/admin', adminRoutes);
app.use(shopRoutes);
app.use(authRoutes);
app.get('/500', errorController.get500);
app.use(errorController.get404);
app.use((error, req, res, next) => {
// res.status(error.httpStatusCode).render(...);
// res.redirect('/500');
res.status(500).render('500', {
pageTitle: 'Error!',
path: '/500',
isAuthenticated: req.session.isLoggedIn
});
});
mongoose
.connect(MONGODB_URI, { useNewUrlParser: true })
.then(result => {
app.listen(3000);
})
.catch(err => {
console.log(err);
});
auth.js 用于控制 isAuthenticated
const crypto = require('crypto');
const bcrypt = require('bcryptjs');
const nodemailer = require('nodemailer');
const sendgridTransport = require('nodemailer-sendgrid-transport');
const { validationResult } = require('express-validator/check');
const User = require('../models/user');
const transporter = nodemailer.createTransport(
sendgridTransport({
auth: {
api_key:
'api.........key'
}
})
);
exports.getLogin = (req, res, next) => {
let message = req.flash('error');
if (message.length > 0) {
message = message[0];
} else {
message = null;
}
res.render('auth/login', {
path: '/login',
pageTitle: 'Login',
errorMessage: message,
oldInput: {
email: '',
password: ''
},
validationErrors: []
});
};
exports.getSignup = (req, res, next) => {
let message = req.flash('error');
if (message.length > 0) {
message = message[0];
} else {
message = null;
}
res.render('auth/signup', {
path: '/signup',
pageTitle: 'Signup',
errorMessage: message,
oldInput: {
email: '',
password: '',
confirmPassword: ''
},
validationErrors: []
});
};
exports.postLogin = (req, res, next) => {
const email = req.body.email;
const password = req.body.password;
const errors = validationResult(req);
if (!errors.isEmpty()) {
return res.status(422).render('auth/login', {
path: '/login',
pageTitle: 'Login',
errorMessage: errors.array()[0].msg,
oldInput: {
email: email,
password: password
},
validationErrors: errors.array()
});
}
User.findOne({ email: email })
.then(user => {
if (!user) {
return res.status(422).render('auth/login', {
path: '/login',
pageTitle: 'Login',
errorMessage: 'Invalid email or password.',
oldInput: {
email: email,
password: password
},
validationErrors: []
});
}
bcrypt
.compare(password, user.password)
.then(doMatch => {
if (doMatch) {
req.session.isLoggedIn = true;
req.session.user = user;
return req.session.save(err => {
console.log(err);
res.redirect('/');
});
}
return res.status(422).render('auth/login', {
path: '/login',
pageTitle: 'Login',
errorMessage: 'Invalid email or password.',
oldInput: {
email: email,
password: password
},
validationErrors: []
});
})
.catch(err => {
console.log(err);
res.redirect('/login');
});
})
.catch(err => {
const error = new Error(err);
error.httpStatusCode = 500;
return next(error);
});
};
exports.postSignup = (req, res, next) => {
const email = req.body.email;
const password = req.body.password;
const errors = validationResult(req);
if (!errors.isEmpty()) {
console.log(errors.array());
return res.status(422).render('auth/signup', {
path: '/signup',
pageTitle: 'Signup',
errorMessage: errors.array()[0].msg,
oldInput: {
email: email,
password: password,
confirmPassword: req.body.confirmPassword
},
validationErrors: errors.array()
});
}
bcrypt
.hash(password, 12)
.then(hashedPassword => {
const user = new User({
email: email,
password: hashedPassword,
cart: { items: [] }
});
return user.save();
})
.then(result => {
res.redirect('/login');
return transporter.sendMail({
to: email,
from: 'shop@node-complete.com',
subject: 'Signup succeeded!',
html: '<h1>You successfully signed up!</h1>'
});
})
.catch(err => {
const error = new Error(err);
error.httpStatusCode = 500;
return next(error);
});
};
exports.postLogout = (req, res, next) => {
req.session.destroy(err => {
console.log(err);
res.redirect('/');
});
};
exports.getReset = (req, res, next) => {
let message = req.flash('error');
if (message.length > 0) {
message = message[0];
} else {
message = null;
}
res.render('auth/reset', {
path: '/reset',
pageTitle: 'Reset Password',
errorMessage: message
});
};
exports.postReset = (req, res, next) => {
crypto.randomBytes(32, (err, buffer) => {
if (err) {
console.log(err);
return res.redirect('/reset');
}
const token = buffer.toString('hex');
User.findOne({ email: req.body.email })
.then(user => {
if (!user) {
req.flash('error', 'No account with that email found.');
return res.redirect('/reset');
}
user.resetToken = token;
user.resetTokenExpiration = Date.now() + 3600000;
return user.save();
})
.then(result => {
res.redirect('/');
transporter.sendMail({
to: req.body.email,
from: 'shop@node-complete.com',
subject: 'Password reset',
html: `
<p>You requested a password reset</p>
<p>Click this <a href="http://localhost:3000/reset/${token}">link</a> to set a new password.</p>
`
});
})
.catch(err => {
const error = new Error(err);
error.httpStatusCode = 500;
return next(error);
});
});
};
exports.getNewPassword = (req, res, next) => {
const token = req.params.token;
User.findOne({ resetToken: token, resetTokenExpiration: { $gt: Date.now() } })
.then(user => {
let message = req.flash('error');
if (message.length > 0) {
message = message[0];
} else {
message = null;
}
res.render('auth/new-password', {
path: '/new-password',
pageTitle: 'New Password',
errorMessage: message,
userId: user._id.toString(),
passwordToken: token
});
})
.catch(err => {
const error = new Error(err);
error.httpStatusCode = 500;
return next(error);
});
};
exports.postNewPassword = (req, res, next) => {
const newPassword = req.body.password;
const userId = req.body.userId;
const passwordToken = req.body.passwordToken;
let resetUser;
User.findOne({
resetToken: passwordToken,
resetTokenExpiration: { $gt: Date.now() },
_id: userId
})
.then(user => {
resetUser = user;
return bcrypt.hash(newPassword, 12);
})
.then(hashedPassword => {
resetUser.password = hashedPassword;
resetUser.resetToken = undefined;
resetUser.resetTokenExpiration = undefined;
return resetUser.save();
})
.then(result => {
res.redirect('/login');
})
.catch(err => {
const error = new Error(err);
error.httpStatusCode = 500;
return next(error);
});
};
控制台中的错误：-
TypeError: Cannot read property 'isLoggedIn' of undefined
at app.use (D:\Udemy Courses\Node Js\19 Error Handling\04-status-codes\app.js:92:34)
at Layer.handle_error (D:\Udemy Courses\Node Js\19 Error Handling\04-status-codes\node_modules\express\lib\router\layer.js:71:5)
at trim_prefix (D:\Udemy Courses\Node Js\19 Error Handling\04-status-codes\node_modules\express\lib\router\index.js:315:13)
at D:\Udemy Courses\Node Js\19 Error Handling\04-status-codes\node_modules\express\lib\router\index.js:284:7
at Function.process_params (D:\Udemy Courses\Node Js\19 Error Handling\04-status-codes\node_modules\express\lib\router\index.js:335:12)
at next (D:\Udemy Courses\Node Js\19 Error Handling\04-status-codes\node_modules\express\lib\router\index.js:275:10)
at Layer.handle_error (D:\Udemy Courses\Node Js\19 Error Handling\04-status-codes\node_modules\express\lib\router\layer.js:67:12)
at trim_prefix (D:\Udemy Courses\Node Js\19 Error Handling\04-status-codes\node_modules\express\lib\router\index.js:315:13)
at D:\Udemy Courses\Node Js\19 Error Handling\04-status-codes\node_modules\express\lib\router\index.js:284:7
at Function.process_params (D:\Udemy Courses\Node Js\19 Error Handling\04-status-codes\node_modules\express\lib\router\index.js:335:12)
at next (D:\Udemy Courses\Node Js\19 Error Handling\04-status-codes\node_modules\express\lib\router\index.js:275:10)
at Layer.handle_error (D:\Udemy Courses\Node Js\19 Error Handling\04-status-codes\node_modules\express\lib\router\layer.js:67:12)
at trim_prefix (D:\Udemy Courses\Node Js\19 Error Handling\04-status-codes\node_modules\express\lib\router\index.js:315:13)
at D:\Udemy Courses\Node Js\19 Error Handling\04-status-codes\node_modules\express\lib\router\index.js:284:7
at Function.process_params (D:\Udemy Courses\Node Js\19 Error Handling\04-status-codes\node_modules\express\lib\router\index.js:335:12)
at next (D:\Udemy Courses\Node Js\19 Error Handling\04-status-codes\node_modules\express\lib\router\index.js:275:10)
我试图通过在 LoggedIn 中分配值来编辑代码，但它随后给出了未定义的 crsf 代码的错误，请帮助我解决此代码，因为很多时候它仍然给出相同的错误。
代码运行得非常好，在我将 multer 包添加到我的节点应用程序以进行文件上传后抛出此错误，现在此错误不会发生。
3 个解决方案
解决方案1
5 已采纳 2019-05-13 14:51:01
我也跟着他的教程遇到了这个问题，还检查了它的root是Express错误处理还是multer。 经过 4 小时的调试和谷歌搜索，这是我找到的解决方案：
和这个：
https://github.com/expressjs/multer/issues/513#issuecomment-422573221
基本上，Windows 操作系统文件不接受以“:”命名。 他使用Mac OS。 所以你必须在new Date().toISOString()前面添加.replace(/:/g, '-') new Date().toISOString()即：
new Date().toISOString() .replace(/:/g, '-')
我希望它也能解决你的问题:)
解决方案2
1 2020-08-13 03:06:30
我遇到过同样的问题，在课程的常见问题部分给出了答案。如果你没有得到它，请按照以下步骤操作..
使用以下命令安装 uuid 包： npm install --save uuid
需要使用： const { v4: uuidv4 } = require('uuid')
将您的代码重写为：
const fileStorage = multer.diskStorage({
destination: (req, file, cb) => {
cb(null, 'images');
},
filename: (req, file, cb) => {
cb(null, uuidv4() + '-' + file.originalname);
}
});
我希望这也能解决你的问题。 谢谢 ：）
解决方案3
1 2020-08-25 10:07:51
为此使用uuid而不是newDate().toIsoString()
const fileStorage = multer.diskStorage({
destination: (req, file, cb) => {
cb(null, 'images');
},
filename: (req, file, cb) => {
cb(null, uuidv4() + '-' + file.originalname);
}
});
无法读取未定义的属性“ then”
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