Use Express+mongodb to build multiplayer blog learning (4) Login and Logout

Login

Modify Index.ejs

<%-include header%>    <% if (locals.error) {%>        <span><%= locals.error%></span >    <%}%>    <form method= "POST" >         User name:<input type= "text" name= "name"/> <br/>         Password:<input type= "password" name= "password"/><br/> <input        type= "Submit" value= "Login"/>    </form><%-include footer%>

Modify Index.js

Router.post ('/login ',function(req,res,next) {    var md5=crypto.createhash ("MD5");    Password=md5.update (Req.body.password). Digest (' Hex ');    Console.log (req.body.name);    User.get (Req.body.name,function (err,user) {        if (!user) {            req.flash (' Error ', "User does not exist");            Return Res.redirect ("/login");        }        Console.log (User.password,password);        if (User.password!==password) {            Req.flash ("Error", "Bad password");            Return Res.redirect ("/login");        }        Req.session.user=user;        Req.flash (' success ', "Login Successful");        Res.redirect ("/");    })});

Log out

New in Index.js:

Router.get ("/logout",function(req,res) {    Req.session.user=null;    Req.flash ("Success", "logout Success");    Res.redirect ("/");});

Now login in the browser after entering: localhost:3000/logout

Modify a template

Login.ejs Index.ejs and Req.ejs.

<% if (locals.xxx) {%>
<span><%= locals.xxx%></span>
<%}%>

This kind of code, remove them.

Modify the Header.ejs as follows:

<! DOCTYPE html><% if (locals.user) {%> <span><a title= "published" Href= "/post" >post</a></span> & Lt;span><a title= "Logout" href= "/logout" >logout</a></span> <%}else{%> <span>& Lt;a title= "Login" href= "/login" >login</a></span> <span><a title= "register" href= "/reg" >register& Lt;/a></span> <%}%></nav> <article><% if (locals.error) {%> <span><%= locals.error%></span> <%}%> <% if (locals.success) {%> <span><%= locals.success%></span> <%}%> ;

Modify Index.js

Router.post ('/login ',function(req,res,next) {varMd5=crypto.createhash ("MD5"); Password=md5.update (Req.body.password). Digest (' Hex '));    Console.log (Req.body.name); User.get (Req.body.name,function(err,user) {if(!user) {Req.flash (' Error ', ' User not present '); returnRes.redirect ("/login");        } console.log (User.password,password); if(user.password!==password) {Req.flash ("Error", "Password Wrong"); returnRes.redirect ("/login"); } Req.flash ( "User", req.session.user= user); Req.flash (' Success ', ' login successful '); Res.redirect ("/"); }); Router.get ("/logout",function(req,res) { Req.flash ( "User", Req.session.user=null); Req.flash ("Success", "Log Out Success"); Res.redirect ("/");});

Modify App.js

App.use (function(req, res, next) {    = Req.flash (' ERROR '). toString ();     = Req.flash (' Success '). toString ();    Res.locals.user  =req.flash ("user"). toString ();    Next ();});

Use Express+mongodb to build multiplayer blog learning (4) Login and Logout