<?php

namespace App\Http\Controllers;

use Illuminate\Support\Facades\Auth;

class LoginController extends Controller
{
 /**
  * Handle an authentication attempt.
  *
  * @return Response
  */
 public function authenticate()
 {
  if (Auth::attempt(['email' => $email, 'password' => $password])) {
   // Authentication passed...
   return redirect()->intended('dashboard');
  }
 }
}

/**
  * Handle a login request to the application.
  *
  * @param \Illuminate\Http\Request $request
  * @return \Illuminate\Http\RedirectResponse|\Illuminate\Http\Response
  */
 public function login(Request $request)
 {
  // 表單驗(yàn)證
  $this->validateLogin($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.
  // 防止暴力破解，多次登錄失敗會根據(jù)IP鎖定
  if ($this->hasTooManyLoginAttempts($request)) {
   $this->fireLockoutEvent($request);

   return $this->sendLockoutResponse($request);
  }
  
  // 這個就是主要的負(fù)責(zé)判斷數(shù)據(jù)庫中是否存在相應(yīng)的賬號和密碼的地方，我們需要重寫的就是attemptLogin方法
  if ($this->attemptLogin($request)) {
   return $this->sendLoginResponse($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.
  // 登錄失敗，失敗次數(shù)++，防止暴力破解
  $this->incrementLoginAttempts($request);

  // 返回失敗響應(yīng)
  return $this->sendFailedLoginResponse($request);
 }

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

public function attemptLogin(Request $request)
 {
  $username = $request->input('username');
  $password = $request->input('password');

  // 驗(yàn)證用戶名登錄方式
  $usernameLogin = $this->guard()->attempt(
   ['username' => $username, 'password' => $password], $request->has('remember')
  );
  if ($usernameLogin) {
   return true;
  }

  // 驗(yàn)證手機(jī)號登錄方式
  $mobileLogin = $this->guard()->attempt(
   ['mobile' => $username, 'password' => $password], $request->has('remember')
  );
  if ($mobileLogin) {
   return true;
  }

  // 驗(yàn)證郵箱登錄方式
  $emailLogin = $this->guard()->attempt(
   ['email' => $username, 'password' => $password], $request->has('remember')
  );
  if ($emailLogin) {
   return true;
  }

  return false;
 }