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POinvalid_grant error when requesting OAuth2 access token for Google Cloud Storage REST API using Service Account
 

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  1. POinvalid_grant error when requesting OAuth2 access token for Google Cloud Storage REST API using Service Account
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    <p>I am creating an API request (GET bucket) for the storage API and one of the required parameter is the "Authorization" header.</p> <p>Please note that I am using a <strong>Service Account</strong> to access the API.</p> <p>I followed the document <a href="https://developers.google.com/accounts/docs/OAuth2ServiceAccount" rel="nofollow">https://developers.google.com/accounts/docs/OAuth2ServiceAccount</a> to get the access token for the "Authorization" header so I could send an authorized request to their REST API. The problem is I am always getting the "invalid_grant" error.</p> <p>Use this code to check it out:</p> <pre><code>&lt;?php error_reporting(E_ERROR); const CLIENT_ID = 'XXXXXXXXXXXX.apps.googleusercontent.com'; const SERVICE_ACCOUNT = 'XXXXXXXXXXXX@developer.gserviceaccount.com'; const KEY_FILE = 'XXX.p12'; function get_oauth_access_token() { $header[alg] = 'RS256'; $header[typ] = 'JWT'; $header = urlencode(base64_encode(utf8_encode(json_encode($header)))); $assertion_time = time(); $claim[iss] = CLIENT_ID; //also tried SERVICE_ACCOUNT here, no improvement $claim[scope] = 'https://www.googleapis.com/auth/devstorage.read_only'; $claim[aud] = 'https://accounts.google.com/o/oauth2/token'; $claim[exp] = $assertion_time + 3600; $claim[iat] = $assertion_time; $claim = urlencode(base64_encode(utf8_encode(json_encode($claim)))); $data = $header . '.' . $claim; $p12 = file_get_contents(KEY_FILE); $cert = array(); openssl_pkcs12_read($p12, $cert, 'notasecret'); $priv_key_id = openssl_get_privatekey($cert[pkey]); openssl_sign($data, $signature, $priv_key_id, 'sha256'); $signature = urlencode(base64_encode($signature)); $assertion = $data . '.' . $signature; $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, 'https://accounts.google.com/o/oauth2/token'); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); curl_setopt($ch, CURLOPT_POST, true); curl_setopt($ch, CURLOPT_POSTFIELDS, array('grant_type'=&gt;'assertion', 'assertion_type'=&gt;'http://oauth.net/grant_type/jwt/1.0/bearer', 'assertion'=&gt;$assertion)); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); $result = curl_exec($ch); $error = curl_error($ch); curl_close($ch); var_dump($result); var_dump($error); } get_oauth_access_token(); </code></pre> <p>Is there anything wrong in this code that causes the "invalid_grant" error?</p>
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