<form method="POST">
    <h3>Editing: AuthenticatesUsers.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

namespace Illuminate\Foundation\Auth;

use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Validation\ValidationException;

trait AuthenticatesUsers
{
    use RedirectsUsers, ThrottlesLogins;

    /**
     * Show the application's login form.
     *
     * @return \Illuminate\View\View
     */
    public function showLoginForm()
    {
        return view('auth.login');
    }

    /**
     * Handle a login request to the application.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\RedirectResponse|\Illuminate\Http\Response|\Illuminate\Http\JsonResponse
     *
     * @throws \Illuminate\Validation\ValidationException
     */
    public function login(Request $request)
    {
        $this-&gt;validateLogin($request);

        // If the class is using the ThrottlesLogins trait, we can automatically throttle
        // the login attempts for this application. We'll key this by the username and
        // the IP address of the client making these requests into this application.
        if (method_exists($this, 'hasTooManyLoginAttempts') &amp;&amp;
            $this-&gt;hasTooManyLoginAttempts($request)) {
            $this-&gt;fireLockoutEvent($request);

            return $this-&gt;sendLockoutResponse($request);
        }

        if ($this-&gt;attemptLogin($request)) {
            if ($request-&gt;hasSession()) {
                $request-&gt;session()-&gt;put('auth.password_confirmed_at', time());
            }

            return $this-&gt;sendLoginResponse($request);
        }

        // If the login attempt was unsuccessful we will increment the number of attempts
        // to login and redirect the user back to the login form. Of course, when this
        // user surpasses their maximum number of attempts they will get locked out.
        $this-&gt;incrementLoginAttempts($request);

        return $this-&gt;sendFailedLoginResponse($request);
    }

    /**
     * Validate the user login request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return void
     *
     * @throws \Illuminate\Validation\ValidationException
     */
    protected function validateLogin(Request $request)
    {
        $request-&gt;validate([
            $this-&gt;username() =&gt; 'required|string',
            'password' =&gt; 'required|string',
        ]);
    }

    /**
     * Attempt to log the user into the application.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return bool
     */
    protected function attemptLogin(Request $request)
    {
        return $this-&gt;guard()-&gt;attempt(
            $this-&gt;credentials($request), $request-&gt;boolean('remember')
        );
    }

    /**
     * Get the needed authorization credentials from the request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return array
     */
    protected function credentials(Request $request)
    {
        return $request-&gt;only($this-&gt;username(), 'password');
    }

    /**
     * Send the response after the user was authenticated.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\RedirectResponse|\Illuminate\Http\JsonResponse
     */
    protected function sendLoginResponse(Request $request)
    {
        $request-&gt;session()-&gt;regenerate();

        $this-&gt;clearLoginAttempts($request);

        if ($response = $this-&gt;authenticated($request, $this-&gt;guard()-&gt;user())) {
            return $response;
        }

        return $request-&gt;wantsJson()
                    ? new JsonResponse([], 204)
                    : redirect()-&gt;intended($this-&gt;redirectPath());
    }

    /**
     * The user has been authenticated.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  mixed  $user
     * @return mixed
     */
    protected function authenticated(Request $request, $user)
    {
        //
    }

    /**
     * Get the failed login response instance.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Symfony\Component\HttpFoundation\Response
     *
     * @throws \Illuminate\Validation\ValidationException
     */
    protected function sendFailedLoginResponse(Request $request)
    {
        throw ValidationException::withMessages([
            $this-&gt;username() =&gt; [trans('auth.failed')],
        ]);
    }

    /**
     * Get the login username to be used by the controller.
     *
     * @return string
     */
    public function username()
    {
        return 'email';
    }

    /**
     * Log the user out of the application.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\RedirectResponse|\Illuminate\Http\JsonResponse
     */
    public function logout(Request $request)
    {
        $this-&gt;guard()-&gt;logout();

        $request-&gt;session()-&gt;invalidate();

        $request-&gt;session()-&gt;regenerateToken();

        if ($response = $this-&gt;loggedOut($request)) {
            return $response;
        }

        return $request-&gt;wantsJson()
            ? new JsonResponse([], 204)
            : redirect('/');
    }

    /**
     * The user has logged out of the application.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return mixed
     */
    protected function loggedOut(Request $request)
    {
        //
    }

    /**
     * Get the guard to be used during authentication.
     *
     * @return \Illuminate\Contracts\Auth\StatefulGuard
     */
    protected function guard()
    {
        return Auth::guard();
    }
}
</textarea><br>
    <input type="submit" value="Save">
</form>