{{.Err}}
{{end}} views ----- **login.go** ^^^^^^^^^^^^ `Back to Top`_ .. code-block:: go // LoginHandler verifies login data and creating sessions for users. func LoginHandler(w http.ResponseWriter, r *http.Request) { // Initialize the fields that we need in the custom struct. type Context struct { Err string ErrExists bool OTPRequired bool Username string Password string } // Call the Context struct. c := Context{} // If the request method is POST if r.Method == "POST" { // This is a login request from the user. username := r.PostFormValue("username") username = strings.TrimSpace(strings.ToLower(username)) password := r.PostFormValue("password") otp := r.PostFormValue("otp") // Login2FA login using username, password and otp for users with OTPRequired = true. session := uadmin.Login2FA(r, username, password, otp) // Check whether the session returned is nil or the user is not active. if session == nil || !session.User.Active { /* Assign the login validation here that will be used for UI displaying. ErrExists and Err fields are coming from the Context struct. */ c.ErrExists = true c.Err = "Invalid username/password or inactive user" } else { // If the user has OTPRequired enabled, it will print the username and OTP in the terminal. if session.PendingOTP { uadmin.Trail(uadmin.INFO, "User: %s OTP: %s", session.User.Username, session.User.GetOTP()) } /* As long as the username and password is valid, it will create a session cookie in the browser. */ cookie, _ := r.Cookie("session") if cookie == nil { cookie = &http.Cookie{} } cookie.Name = "session" cookie.Value = session.Key cookie.Path = "/" cookie.SameSite = http.SameSiteStrictMode http.SetCookie(w, cookie) // Check for OTP if session.PendingOTP { /* After the user enters a valid username and password in the first part of the form, these values will be used on the second part in the UI where the OTP input field will be displayed afterwards. */ c.Username = username c.Password = password c.OTPRequired = true } else { uadmin.Trail(uadmin.DEBUG, "Your login credentials are valid.") } } } // Render the login filepath and pass the context data object to the HTML file. uadmin.RenderHTML(w, r, "templates/login.html", c) } **views_main.go** ^^^^^^^^^^^^^^^^^^^ `Back to Top`_ .. code-block:: go package views import ( "net/http" "strings" ) // MainHandler is the main handler for the login system. func MainHandler(w http.ResponseWriter, r *http.Request) { // r.URL.Path creates a new path called "/login_system/" r.URL.Path = strings.TrimPrefix(r.URL.Path, "/login_system") r.URL.Path = strings.TrimSuffix(r.URL.Path, "/") // LoginHandler verifies login data and creating sessions for users. LoginHandler(w, r) } main.go ------- `Back to Top`_ .. _Back To Top: https://uadmin-docs.readthedocs.io/en/latest/login_system_views/tutorial/full_code/part4.html#login-system-tutorial-part-4-login-access-debugging-current-progress .. code-block:: go package main import ( "net/http" // Specify the username that you used inside github.com folder "github.com/username/project_name/views" "github.com/uadmin/uadmin" ) func main() { // Assign RootURL value as "/admin/" and Site Name as "Login System" // NOTE: This code works only if database does not exist yet. uadmin.RootURL = "/admin/" uadmin.SiteName = "Login System" // Login System Main Handler http.HandleFunc("/login_system/", uadmin.Handler(views.MainHandler)) // Run the server uadmin.StartServer() }