Token is used in nodejs

@ Yue Yan Shao Falcon

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and java equally ,token Generation / There are many ways to store , Now let's focus on one way :
That is to use :jwt ; Download dependency npm install jsonwebtoken --save
(ps: Because front end and back end separation often involves cross domain , I have already talked about . introduce cors Wait for the operation ).

For convenience I will jwt The usage of is separately encapsulated into js file
// Introducing module dependencies
var jwt = require('jsonwebtoken');
var secretOrPrivateKey="jwtSecret",// secret key , It's usually complicated , Can be stored locally on the server ; And get ;
    duringTime={expiresIn:60*30};// 1 Hours expired ;
var  Jwt={
    setJwt:function (content) {
        var token=jwt.sign(content, secretOrPrivateKey,duringTime);
        return token
    },
    getJwt:function (token,callback) {
        jwt.verify(token,secretOrPrivateKey, function(err, decode){
            callback(err,decode);
        });
    }
};
module.exports = Jwt;

Next use :
// One : Obtain and authenticate . I'm used to app.js In the middle of token authentication
app.use(function (request,response,next) {
    if(request.url=='/routers/load/doLogin'||request.url=='/routers/load/doRegist'){// Can be more . Don't list
      next();
    }else{
      var token=request.body.token;
      if(token&&token!=''){
        // verification token
          Jwt.getJwt(token,function (err,decode) {
              if (err) {
                // When time lapses || fake token
                  response.send({'msgCode':-1});
              } else {
                // Get access
                  next();
              }
          })
      }else{
        //token non-existent
        response.send({"msgCode":-1});
      }
    }
});

// Two : Generate and pass
I personally like and java The back end is the same , Separate routing from logical processing , Create a new one service Folder ; This will make the route look clean , The business process is service layer
controller layer --routers route
var express=require("express");
var routers=express.Router();
var userService=require("../../services/userService");
routers.post("/doLogin",function (request,response) {
    var data={
        username:request.body.username,
        password:request.body.password
    };
    userService.findUser(data,function (res) {
        response.send(res)
    });
});
routers.post("/doRegist",function (request,response) {
    var data={
        username:request.body.username,
        password:request.body.password
    };
    userService.addUser(data,function (res) {
        response.send(res)
    });
});
module.exports=routers;

service layer -- Will be generated here token.
var dbName='dbUser';
var collectionName='user';
var connect=require("../myUtils/dbUtils/connet");
var sortData={};
var Jwt=require("../myUtils/jwtUtils/jwt");

var userService={
    findUser:function (data,callback) {
        connect.find(dbName,collectionName,data,sortData,function (res) {
            if(res.length>0){
                var token=Jwt.setJwt({username:data.username});
                callback({
                    msgCode:0,
                    message:' Landing successful !',
                    token:token
                });
            }else{
               callback({
                    msgCode:-1,
                    message:' Login failed ! Wrong user name or password '
                });
            }
        })
    },
    addUser:function (data,callback) {
        connect.find(dbName,collectionName,data,sortData,function (res) {
            if(res.length>0){
                callback({
                    msgCode:-1,
                    message:" Registration failed ! The user name is already registered "
                })
            }else{
                var token=Jwt.setJwt({username:data.username});
                connect.add(dbName,collectionName,data,function (res) {
                    if(res.result.n>=1){
                        callback({
                            msgCode:0,
                            message:" Registered successfully !",
                            token:token
                        });
                    }else{
                        callback({
                            msgCode:-1,
                            message:" Exception error , Registration failed !"
                        });
                    }
                })
            }
        })
    }
};
module.exports=userService;

Finally, what the front end needs to do is , Receive the message on the login and registration page token, Save to local (localStorage etc. ), Then you can take it with you when you get data from other pages and request data from the server

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