Golang-Loginserver

SIgnuppage

Package: main

Imports:

• “fmt”
• “html/template”
• “net/http”
• “github.com/gorilla/sessions”
• “github.com/tawesoft/golib/v2 v2.6.1 // indirect”

Type: page

• Status: bool
• Header1: interface{}
• IsLoggedin: bool
• Valid: bool

Var:

• tpl: *template.Template
• Store: sessions.NewCookieStore([]byte(“session”))
• P: page{ Status: false }
• userData: map[string]string{ “username”: “abhinand”, “password”: “123”, }

functions :

• func init
• func login
• func loginHandler
• func logoutHandler
• func middleware
• func index
• func main

Main-func Working

• http.HandleFunc(“/”, index)
• http.HandleFunc(“/login-submit”, loginHandler)
• http.HandleFunc(“/login”, login)
• http.HandleFunc(“/logout”, Logouthandler)
• http.ListenAndServe(“localhost:8080”, nil)

Func: init

• Initializes the template by parsing the templates located in the “template/*.html” glob pattern.

Func: index

• Handles the “/” route.
• Executes the “index.html” template and sends the output to the http.ResponseWriter.
• Calls the Middleware function to check if the user is logged in.
• If the user is logged in, sets the page.Status value to true.

Func: login

• Handles the “/login” route.
• Executes the “login.html” template and sends the output to the http.ResponseWriter.
• Calls the Middleware function to check if the user is logged in.
• If the user is logged in, redirects to the “/login-submit” route.

Func: loginHandler

• Handles the “/login-submit” route.
• If the request method is GET, calls the Middleware function to check if the user is logged in.
• If the user is logged in, redirects to the “/” route.
• Parses the form data from the request.
• Gets the email and password values from the request form data.
• If the email and password match the ones in the userData map and the request method is POST, creates a new session and sets the “id” value to “AKSHAY”.
• Sets the page.Header1 value to the session “id” value.
• Saves the session and redirects to the “/” route.
• If the email and password don’t match or the request method is not POST, redirects to the “/login” route.

Func: logoutHandler

• Handles the “/logout” route.
• If the user is logged in (page.Status is true), gets the session and sets the MaxAge value to -1 to expire the session.
• Saves the session and redirects to the “/” route.
• If the user is not logged in (page.Status is false), redirects to the “/login” route.

Func: Middleware

• Takes an http.ResponseWriter and an http.Request as arguments.
• Gets the session and checks if the “id” value is set.
• If the “id” value is set, returns true.
• If the “id” value is not set, returns false.