Login System Tutorial Part 4 - Login Access Debugging (Full Source Code)ΒΆ

package handlers

import (
    "net/http"
    "strings"

    "github.com/uadmin/uadmin"
)

// UserContext !
type UserContext struct {
    User    *uadmin.User
    OTP     bool
    Message string
}

// LoginHandler !
func LoginHandler(w http.ResponseWriter, r *http.Request) {
    // r.URL.Path creates a new path called /login
    r.URL.Path = strings.TrimPrefix(r.URL.Path, "/login")

    // Initialize the User model from uAdmin
    user := uadmin.User{}

    // Initialize the UserContext struct that we have created
    userContext := UserContext{}

    // Check if the user submits request in HTML form
    if r.Method == "POST" {
        // Check if the value of the request is login
        if r.FormValue("request") == "login" {
            // Create the parameter of "username"
            username := r.FormValue("username")

            // Get the user record where username is the assigned value
            uadmin.Get(&user, "username=?", username)

            // Check if the fetched record is existing in the User model
            if user.ID > 0 {
                // Create the parameters of "password" and "otp_pass"
                password := r.FormValue("password")
                otpPass := r.FormValue("otp_pass")

                // Pass the requested username and password in Login function to
                // return the full name of the User and the boolean value for
                // IsOTPRequired
                login, otp := uadmin.Login(r, username, password)

                // Initialize Login2FA that returns the User
                login2fa := &uadmin.User{}

                // Check whether the OTP value from Login function is true
                // and the OTP Password is valid
                if otp == true && user.VerifyOTP(otpPass) {
                    // Pass the requested username, password, and OTP Password in
                    // Login2FA function to return the full name of the User
                    login2fa = uadmin.Login2FA(r, username, password, otpPass)

                    // Print the result
                    uadmin.Trail(uadmin.DEBUG, "Login with 2FA as: %s", login2fa)
                }

                // Print results
                uadmin.Trail(uadmin.DEBUG, "Login as: %s", login)
                uadmin.Trail(uadmin.DEBUG, "OTP: %t", otp)
            }
        }
    }

    // Pass the userContext data object to the HTML file
    uadmin.HTMLContext(w, userContext, "views/login.html")
    return
}