function mwp_format_memory_limit($limit)
{
if ((string) (int) $limit === (string) $limit) {
// The number is numeric.
return mwp_format_bytes($limit);
}
$units = strtolower(substr($limit, -1));
if (!in_array($units, array('b', 'k', 'm', 'g'))) {
// Invalid size unit.
return $limit;
}
$number = substr($limit, 0, -1);
if ((string) (int) $number !== $number) {
// The number isn't numeric.
return $number;
}
switch ($units) {
case 'g':
return $number . ' GB';
case 'm':
return $number . ' MB';
case 'k':
return $number . ' KB';
case 'b':
default:
return $number . ' B';
}
}
/**
* Downloads backup file from Google Drive to root folder on local server.
*
* @param array $args arguments passed to the function
* [google_drive_token] -> user's Google drive token in json form
* [google_drive_directory] -> folder on user's Google Drive account which backup file should be downloaded from
* [google_drive_site_folder] -> subfolder with site name in google_drive_directory which backup file should be downloaded from
* [backup_file] -> absolute path of backup file on local server
* [file_id] -> google file id
*
* @return bool|array absolute path to downloaded file is successful, array with error message if not
*/
public function get_google_drive_backup($args)
{
mwp_register_autoload_google();
$googleClient = new Google_ApiClient();
$googleClient->setAccessToken($args['google_drive_token']);
$driveService = new Google_Service_Drive($googleClient);
mwp_logger()->info('Connecting to Google Drive');
try {
$about = $driveService->about->get();
$rootFolderId = $about->getRootFolderId();
} catch (Exception $e) {
mwp_logger()->error('Error while connecting to Google Drive', array('exception' => $e));
return array('error' => 'Error while connecting to Google Drive: ' . $e->getMessage());
}
if (empty($args['file_id'])) {
mwp_logger()->info('Looking for backup directory');
try {
$backupFolderFiles = $driveService->files->listFiles(array('q' => sprintf("title='%s' and '%s' in parents and trashed = false", addslashes($args['google_drive_directory']), $rootFolderId)));
} catch (Exception $e) {
mwp_logger()->error('Error while looking for backup directory', array('exception' => $e));
return array('error' => 'Error while looking for backup directory: ' . $e->getMessage());
}
if (!$backupFolderFiles->offsetExists(0)) {
mwp_logger()->error('Backup directory ("{directory}") does not exist', array('directory' => $args['google_drive_directory']));
return array('error' => sprintf("The backup directory (%s) does not exist.", $args['google_drive_directory']));
}
/** @var Google_Service_Drive_DriveFile $backupFolder */
$backupFolder = $backupFolderFiles->offsetGet(0);
if ($args['google_drive_site_folder']) {
mwp_logger()->info('Looking into the site folder');
try {
$siteFolderFiles = $driveService->files->listFiles(array('q' => sprintf("title='%s' and '%s' in parents and trashed = false", addslashes($this->site_name), $backupFolder->getId())));
} catch (Exception $e) {
mwp_logger()->error('Error while looking for the site folder', array('exception' => $e));
return array('error' => 'Error while looking for the site folder: ' . $e->getMessage());
}
if ($siteFolderFiles->offsetExists(0)) {
$backupFolder = $siteFolderFiles->offsetGet(0);
}
}
try {
$backupFiles = $driveService->files->listFiles(array('q' => sprintf("title='%s' and '%s' in parents and trashed = false", addslashes($args['backup_file']), $backupFolder->getId())));
} catch (Exception $e) {
mwp_logger()->error('Error while fetching Google Drive backup file', array('file_name' => $args['backup_file'], 'exception' => $e));
return array('error' => 'Error while fetching Google Drive backup file: ' . $e->getMessage());
}
if (!$backupFiles->offsetExists(0)) {
return array('error' => sprintf('Backup file "%s" was not found on your Google Drive account.', $args['backup_file']));
}
/** @var Google_Service_Drive_DriveFile $backupFile */
$backupFile = $backupFiles->offsetGet(0);
} else {
try {
/** @var Google_Service_Drive_DriveFile $backupFile */
$backupFile = $driveService->files->get($args['file_id']);
} catch (Exception $e) {
mwp_logger()->error('Error while fetching Google Drive backup file by id', array('file_id' => $args['file_id'], 'exception' => $e));
return array('error' => 'Error while fetching Google Drive backup file: ' . $e->getMessage());
}
}
$downloadUrl = $backupFile->getDownloadUrl();
$downloadLocation = ABSPATH . 'mwp_temp_backup.zip';
$fileSize = $backupFile->getFileSize();
$downloaded = 0;
$chunkSize = 1024 * 1024 * 4;
$fh = fopen($downloadLocation, 'w+');
if (!is_resource($fh)) {
return array('error' => 'Temporary backup download location is not writable (location: "%s").', $downloadLocation);
}
while ($downloaded < $fileSize) {
$request = new Google_Http_Request($downloadUrl);
$googleClient->getAuth()->sign($request);
$toDownload = min($chunkSize, $fileSize - $downloaded);
mwp_logger()->info('Downloading: {downloaded}/{size}', array('downloaded' => mwp_format_bytes($downloaded), 'size' => mwp_format_bytes($fileSize)));
$request->setRequestHeaders($request->getRequestHeaders() + array('Range' => 'bytes=' . $downloaded . '-' . ($downloaded + $toDownload - 1)));
$googleClient->getIo()->makeRequest($request);
if ($request->getResponseHttpCode() !== 206) {
mwp_logger()->error('Google Drive has returned an invalid response', array('response_headers' => $request->getResponseHeaders(), 'response_body' => $request->getResponseBody()));
return array('error' => sprintf('Google Drive service has returned an invalid response code (%s)', $request->getResponseHttpCode()));
}
fwrite($fh, $request->getResponseBody());
$downloaded += $toDownload;
}
fclose($fh);
$fileMd5 = md5_file($downloadLocation);
if ($backupFile->getMd5Checksum() !== $fileMd5) {
mwp_logger()->error('File checksum does not match, downloaded file is corrupted.', array('original' => $backupFile->getMd5Checksum(), 'downloaded' => $fileMd5));
return array('error' => 'File downloaded was corrupted.');
}
return $downloadLocation;
}
