[PHP] Google SNS 로그인 Composer 이용

• composer.json

"require":{
  "google/apiclient" : "^2.0"
}

• routes/web.php

Route::get('googleLoginPage',['as'=>'googleLoginPage', 'uses'=> 'GoogleController@googleLoginPage'])
Route::get('callbackGoogle',['as'=>'callbackGoogle', 'uses'=> 'GoogleController@callbackGoogle'])

• GoogleController

use Google/Client as Google_Client;

# 구글 로그인 페이지
public function googleLoginPage(){
  $this->getGoogleOauthClient("login");
}

# 구글 유저 정보 가져오기
public function callbackGoogle(){
  $client = $this->getGoogleOauthClient("auth");
  $plus = new \Google_Service_Oauth2($client);
  
  $userData = $plus->userinfo->get();
  
  # 유저 정보
  $social_id    = $userData->id; 
  $social_email = $userData->email;
  $social_name  = $userData->name;  
  
}

private function getGoogleOauthClient($type){
  $client_id = $this->client_id;
  $client_secret = $this->client_secret;
  $authCode = $_GET['code'];
  $redirectURI = '도메인/callbacokGoogle';
  
  $client = new Google_Client();
  $client->setScopse(
    array(
      \Google_service_Oauth2::USERINFO_PRIFILE,
      \Google_service_Oauth2::USERINFO_EMAIL
    )
  );
  
  $client->setClientId($client_id);
  $client->setRedirectUri($redirectURI);
  $client->setAccessType('offline');
  $client->setPrompt('select_account consent');
  
  if(!empty($authCode) && $type == 'auth'){
    # 로그인 페이지가 아닌, 인증 받은 후 유저 정보를 가져올때 $client_secret 필요
    $client->setClientSecret($client_secret);
  }
  
  if($client->isAccessTokenExpired()){
    if($client->getRefreshToken()){
      $client->fetchAccessTokenWithRefreshToken($client->getRefreshToken());
    }else{
       if(!empty($authCode) && $type == 'auth'){
          $accessToken = $client->fetchAccessTokenWithAuthCode($authCode);
          $client->setAccessToken($accessToken);
          if(array_ket_exists('error', $accessToken)){
            throw new Exception(join(',',$accessToken));
          }
       }elseif($type =='login'){
         # 구글 로그인 페이지로 리다이렉트
         header("location".$client->createAuthUrl());
       }
    }
  }  
  if($type != "login"){
    return $client;
  }  
}