PHP 및 OAuth: Google 로그인 통합 구현

$authUrl = 'https://accounts.google.com/o/oauth2/auth';
$client_id = 'YOUR_CLIENT_ID';
$redirect_uri = 'YOUR_REDIRECT_URI';
$scope = 'email profile';
$response_type = 'code';

$url = $authUrl . '?' . http_build_query([
    'client_id' => $client_id,
    'redirect_uri' => $redirect_uri,
    'scope' => $scope,
    'response_type' => $response_type,
]);

header("Location: $url");
exit();

$tokenUrl = 'https://www.googleapis.com/oauth2/v4/token';
$client_id = 'YOUR_CLIENT_ID';
$client_secret = 'YOUR_CLIENT_SECRET';
$redirect_uri = 'YOUR_REDIRECT_URI';
$code = $_GET['code'];

$data = [
    'code' => $code,
    'client_id' => $client_id,
    'client_secret' => $client_secret,
    'redirect_uri' => $redirect_uri,
    'grant_type' => 'authorization_code',
];

$options = [
    'http' => [
        'header' => "Content-type: application/x-www-form-urlencoded
",
        'method' => 'POST',
        'content' => http_build_query($data),
    ],
];

$context = stream_context_create($options);
$response = file_get_contents($tokenUrl, false, $context);

$token = json_decode($response, true);
$access_token = $token['access_token'];

$userInfoUrl = 'https://www.googleapis.com/oauth2/v2/userinfo';

$options = [
    'http' => [
        'header' => "Authorization: Bearer $access_token
",
    ],
];

$context = stream_context_create($options);
$response = file_get_contents($userInfoUrl, false, $context);

$userInfo = json_decode($response, true);
$email = $userInfo['email'];
$name = $userInfo['name'];