Google Authentication using PHP Fails

Question

I am trying to allow users to sign in to my website using Google's library in PHP. Their example is Here. However, using the code they provided, I get the same error every time. My First file is signin.php :

<?php
require_once __DIR__.'/google-api-php-client/vendor/autoload.php';

session_start();

$client = new Google_Client();
$client->setAuthConfigFile('client_secrets.json');
$client->setRedirectUri('https://' . $_SERVER['HTTP_HOST'] . '/authenticate.php');
$client->addScope("profile");
$client->addScope("email");
$client->addScope("openid");

if (isset($_SESSION['access_token']) && $_SESSION['access_token']) {
  $client->setAccessToken($_SESSION['access_token']);
} else {
  $redirect_uri = 'http://' . $_SERVER['HTTP_HOST'] . '/authenticate.php';
  header('Location: ' . filter_var($redirect_uri, FILTER_SANITIZE_URL));
}

And the second file is authenticate.php:

<?php
require_once __DIR__.'/google-api-php-client/vendor/autoload.php';

session_start();

$client = new Google_Client();
$client->setAuthConfigFile('client_secrets.json');
$client->setRedirectUri('https://' . $_SERVER['HTTP_HOST'] . '/authenticate.php');
$client->addScope("profile");
$client->addScope("email");
$client->addScope("openid");

if (! isset($_GET['code'])) {
  $auth_url = $client->createAuthUrl();
  header('Location: ' . filter_var($auth_url, FILTER_SANITIZE_URL));
} else {
  $yo = $client->authenticate($_GET['code']);
  print_r($yo);
  //$_SESSION['access_token'] = $client->getAccessToken();
   $token = $client->fetchAccessTokenWithAuthCode($_GET['code']);
  print_r($token);
  $redirect_uri = 'http://' . $_SERVER['HTTP_HOST'] . '/signin.php';
  //header('Location: ' . filter_var($redirect_uri, FILTER_SANITIZE_URL));
}

Every time I run this, I select my account and I am returned to the page. There is the necessary code returned, but it fails to authenticate it with the following error:

Array ( [error] => invalid_request [error_description] => Could not determine client ID from request. ) Array ( [error] => invalid_request [error_description] => Could not determine client ID from request. )

Martin Zeitler · Accepted Answer · 2019-02-02 18:00:33Z

1

manually generate a client_secrets.json and make sure the path is correct.

edited Feb 2, 2019 at 18:00

answered Feb 2, 2019 at 17:56

Martin Zeitler

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2 Comments

Daniel H Over a year ago

I have tried this, even setting the client_id through a command as well. Also, the authentication page loads, which requires a client_id on its own. So unfortunately, this is not the problem.

Martin Zeitler Over a year ago

@DanielH you might have generated the wrong type of account; for a service account there should be no authentication page. see developers.google.com/api-client-library/php/auth/…

LanternCode · Accepted Answer · 2021-01-16 16:52:02Z

1

When you redirect using header(location:...) the session data that you've established is lost. Try doing a var_dump of your session variable after you're redirected back into your application and you should see it empty, at least that's what happened in my situation. Everything else you do appears correct to me.

answered Jan 16, 2021 at 16:52

LanternCode

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