rest - Google Api for PHP (Drive API) Export as .pdf uploaded .docx file -

i cannot obtain stable script when try upload docx file google drive, , download file pdf.

code:

//google api require_once('vendor/autoload.php');  putenv('google_application_credentials='.__dir__.'/2ab4ece19bd5.json'); $client = new google_client(); $client->setapplicationname('sp-gen'); $client->setscopes(array('https://www.googleapis.com/auth/drive')); $client->useapplicationdefaultcredentials(); $service = new google_service_drive($client);  $filemetadata = new google_service_drive_drivefile(array(   'name' => '281e2399740c88957143507721bd0f25.docx',   'mimetype' => 'application/vnd.google-apps.document'   ));  $content = file_get_contents('281e2399740c88957143507721bd0f25.docx');  $file = $service->files->create($filemetadata, array(   'data' => $content,   'mimetype' => 'application/vnd.google-apps.document',   'uploadtype' => 'multipart',   'fields' => 'id') );  $content = $service->files->export($file->id, 'application/pdf', array( 'alt' => 'media' )); file_put_contents(str_replace('.docx', '.pdf', '281e2399740c88957143507721bd0f25.docx'), $content->getbody()->getcontents()); 

this code works in.. 20-30% of uses. sometimes, $service->files->export() return error code 500 in many cases request return normal response (200) content-length 0.

am doing wrong? or should kind of loop, try download file until success?

ok. spend 2 days looking solution , came several conclusions:

1. using server-to-server authentication, must create service account, "separate" google drive account. that's means if create file via script, file created on service account, , can access file via api.

2. you can assign permissions created file, connect real google account file, , can access file via google drive. can not transfer ownership file service account google account, because google php api @ moment not have proper method. or not see way setup this. class summary.

3. key use exponential backoff. in other words try unless success. ( ͡° ͜ʖ ͡°)

code:

//google api require_once('vendor/autoload.php');  putenv('google_application_credentials='.__dir__.'/2ab4ece19bd5.json'); $client = new google_client(); $client->setapplicationname('sp-gen'); $client->setscopes(array('https://www.googleapis.com/auth/drive')); $client->useapplicationdefaultcredentials(); $service = new google_service_drive($client);  $filemetadata = new google_service_drive_drivefile(array(   'name' => '281e2399740c88957143507721bd0f25.docx',   'mimetype' => 'application/vnd.google-apps.document'   ));  $content = file_get_contents('281e2399740c88957143507721bd0f25.docx');  $file = $service->files->create($filemetadata, array(   'data' => $content,   'uploadtype' => 'multipart' );  //create new permission $newpermission = new google_service_drive_permission();  //set email of account, have access file. $newpermission->setemailaddress('<email here>');  //must user or group, if pass email adress // user | group | domain | $newpermission->settype('user');  //could owner can not set transferownership  // organizer | owner | reader | writer $newpermission->setrole('writer');  $service->permissions->create($file->getid(), $newpermission);  $file_name = str_replace('.docx', '.pdf', '281e2399740c88957143507721bd0f25.docx');  $attempt = 1; do{   //wait 5000ms   usleep(500000*$attempt);    //try pdf file.   $content = $service->files->export($file->getid(), 'application/pdf', array( 'alt' => 'media' ));    //save fetched data.   file_put_contents($file_name, $content->getbody()->getcontents());    if(filesize($file_name)) break;   else $attempt++;  }while(true);