Log in with Username or Email in Laravel 5 - AuthController->postLogin()

laravel-5-tweak-login-authcontroller.php

<?php
/**
 * This snippet goes into your
 * \app\Http\Controllers\Auth\AuthController.php
 * 
 * Make sure to update your login view as well
 * (\resources\views\auth\login.blade.php). Just
 * change
 */

/**
 * Handle a login request to the application.
 *
 * @param  \Illuminate\Http\Request  $request
 * @return \Illuminate\Http\Response
 */
public function postLogin(Request $request)
{
    // get our login input
    $login = $request->input('login');

    // check login field
    $login_type = filter_var( $login, FILTER_VALIDATE_EMAIL ) ? 'email' : 'username';

    // merge our login field into the request with either email or username as key
    $request->merge([ $login_type => $login ]);

    // let's validate and set our credentials
    if ( $login_type == 'email' ) {

        $this->validate($request, [
            'email'    => 'required|email',
            'password' => 'required',
        ]);

        $credentials = $request->only( 'email', 'password' );

    } else {

        $this->validate($request, [
            'username' => 'required',
            'password' => 'required',
        ]);

        $credentials = $request->only( 'username', 'password' );

    }

    if ($this->auth->attempt($credentials, $request->has('remember')))
    {
        return redirect()->intended($this->redirectPath());
    }

    return redirect($this->loginPath())
        ->withInput($request->only('login', 'remember'))
        ->withErrors([
            'login' => $this->getFailedLoginMessage(),
        ]);
}