nodejs渐入佳境[25]-express-middleware+mongoDB实现用户权限验证

查找token

查找数据库Token是否存在

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UserSchema.statics.findByToken = function (token) {
var User = this;
var decoded;

try {
decoded = jwt.verify(token, 'abc123');
} catch (e) {
return Promise.reject();
}

return User.findOne({
'_id': decoded._id,
'tokens.token': token,
'tokens.access': 'auth'
});
};

auth-middleware

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//auth middlewire,代码重用性高。
var authenticate = (req, res, next) => {
var token = req.header('x-auth');

User.findByToken(token).then((user) => {
if (!user) {
return Promise.reject();
}

req.user = user;
req.token = token;
next();
}).catch((e) => {
res.status(401).send();
});
};

url

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app.get('/users/me', authenticate, (req, res) => {
res.send(req.user);
});

完整代码

postman.js

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var mongoose = require('mongoose');
var express = require('express');
var bodyParser = require('body-parser');
const {ObjectID} = require('mongodb');
var _ = require('lodash');

const validator = require('validator');


const jwt = require('jsonwebtoken');
//app
var app = express();
const port = process.env.PORT || 3000;
//express middleware Jonson对象与字符串转换。
app.use(bodyParser.json());

//
mongoose.Promise = global.Promise;
//连接mogodb
mongoose.connect(process.env.MONGODB_URI || 'mongodb://localhost:27017/TodoApp');

//模版
var Todo = mongoose.model('Todo',{
text:{
type:String, //类型
required:true, //必须要有
minlength:1, //最小长度
trim:true //去除空格
},
completed:{
type:Boolean,
default:false //默认值
},
completedAt:{
type:Number,
default:null
}
});





var UserSchema = new mongoose.Schema({
email: {
type: String,
required: true,
trim: true,
minlength: 1,
unique: true,
validate: {
validator: validator.isEmail,
message: '{VALUE} is not a valid email'
}
},
password: {
type: String,
require: true,
minlength: 6
},
tokens: [{
access: {
type: String,
required: true
},
token: {
type: String,
required: true
}
}]
});

UserSchema.methods.toJSON = function () {
var user = this;
var userObject = user.toObject();

return _.pick(userObject, ['_id', 'email']);
};

UserSchema.methods.generateAuthToken = function () {
var user = this;
var access = 'auth';
var token = jwt.sign({_id: user._id.toHexString(), access}, 'abc123').toString();

user.tokens = user.tokens.concat([{access,token}]);

return user.save().then(() => {
return token; //返回token
});
};


UserSchema.statics.findByToken = function (token) {
var User = this;
var decoded;

try {
decoded = jwt.verify(token, 'abc123');
} catch (e) {
return Promise.reject();
}

return User.findOne({
'_id': decoded._id,
'tokens.token': token,
'tokens.access': 'auth'
});
};


var User = mongoose.model('User', UserSchema);





//auth middlewire

var authenticate = (req, res, next) => {
var token = req.header('x-auth');

User.findByToken(token).then((user) => {
if (!user) {
return Promise.reject();
}

req.user = user;
req.token = token;
next();
}).catch((e) => {
res.status(401).send();
});
};



app.get('/users/me', authenticate, (req, res) => {
res.send(req.user);
});



//express route
app.post('/todos',(req,res)=>{
// console.log(req.body);

//建立对象document
var todo = new Todo({
text:req.body.text
});
//保存
todo.save().then((doc)=>{
res.send(doc);
},(e)=>{
res.status(400).send(e);
});

})
//获取所有属性

app.get('/todos', (req, res) => {
Todo.find().then((todos) => {
res.send({todos});
}, (e) => {
res.status(400).send(e);
})
});


//查询id
app.get('/todos/:id', (req, res) => {
var id = req.params.id;

if (!ObjectID.isValid(id)) {
return res.status(404).send();
}

Todo.findById(id).then((todo) => {
if (!todo) {
return res.status(404).send();
}

res.send({todo});
}).catch((e) => {
res.status(400).send();
});
});


//删除
app.delete('/todos/:id', (req, res) => {
var id = req.params.id;

if (!ObjectID.isValid(id)) {
return res.status(404).send();
}

Todo.findByIdAndRemove(id).then((todo) => {
if (!todo) {
return res.status(404).send();
}

res.send({todo});
}).catch((e) => {
res.status(400).send();
});
});

//更新
app.patch('/todos/:id', (req, res) => {
var id = req.params.id;
var body = _.pick(req.body, ['text', 'completed']);

if (!ObjectID.isValid(id)) {
return res.status(404).send();
}

if (_.isBoolean(body.completed) && body.completed) {
body.completedAt = new Date().getTime();
} else {
body.completed = false;
body.completedAt = null;
}

Todo.findByIdAndUpdate(id, {$set: body}, {new: true}).then((todo) => {
if (!todo) {
return res.status(404).send();
}

res.send({todo});
}).catch((e) => {
res.status(400).send();
})
});


// POST /users
app.post('/users', (req, res) => {
var body = _.pick(req.body, ['email', 'password']);
var user = new User(body);

user.save().then(() => {
return user.generateAuthToken(); //调用方法,产生auth token并保存。
}).then((token) => {
res.header('x-auth', token).send(user); //设置了响应头
}).catch((e) => {
res.status(400).send(e);
})
});

//监听
app.listen(port,()=>{
console.log(`Start on port ${port}`);
});
module.exports = {
app,
Todo
}

测试

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1、打开mongoDB > ./mongod -dbpath /Users/jackson/Downloads/mongodb-data
2、运行 >node postman.js
3、打开postman 选择post 输入 >localhost:3000/users
Body中填入:
{
"email": "zhuimengshaonian07@gmail.com",
"password" : "123abc!"
}
返回:
{
"_id": "5bfe716591e78c6a4ad8c164",
"email": "zhuimengshaonian07@gmail.com"
}

header:
x-auth →eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJfaWQiOiI1YmZlNzE2NTkxZTc4YzZhNGFkOGMxNjQiLCJhY2Nlc3MiOiJhdXRoIiwiaWF0IjoxNTQzNDAxODI5fQ.wOKNzkls_w_jA5YVkCo0r9gFZ4-KtD6GarRiCDpAPr8

4、localhost:3000/users/me
增加header:
x-auth →eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJfaWQiOiI1YmZlNzE2NTkxZTc4YzZhNGFkOGMxNjQiLCJhY2Nlc3MiOiJhdXRoIiwiaWF0IjoxNTQzNDAxODI5fQ.wOKNzkls_w_jA5YVkCo0r9gFZ4-KtD6GarRiCDpAPr8

查询后返回:
{
"_id": "5bfe716591e78c6a4ad8c164",
"email": "zhuimengshaonian07@gmail.com"
}