/**
* Downloads the file from external repository and saves it in moodle filepool.
* This function is different from {@link repository::sync_external_file()} because it has
* bigger request timeout and always downloads the content.
*
* This function is invoked when we try to unlink the file from the source and convert
* a reference into a true copy.
*
* @throws exception when file could not be imported
*
* @param stored_file $file
* @param int $maxbytes throw an exception if file size is bigger than $maxbytes (0 means no limit)
*/
public function import_external_file_contents(stored_file $file, $maxbytes = 0)
{
if (!$file->is_external_file()) {
// nothing to import if the file is not a reference
return;
} else {
if ($file->get_repository_id() != $this->id) {
// error
debugging('Repository instance id does not match');
return;
} else {
if ($this->has_moodle_files()) {
// files that are references to local files are already in moodle filepool
// just validate the size
if ($maxbytes > 0 && $file->get_filesize() > $maxbytes) {
throw new file_exception('maxbytes');
}
return;
} else {
if ($maxbytes > 0 && $file->get_filesize() > $maxbytes) {
// note that stored_file::get_filesize() also calls synchronisation
throw new file_exception('maxbytes');
}
$fs = get_file_storage();
$contentexists = $fs->content_exists($file->get_contenthash());
if ($contentexists && $file->get_filesize() && $file->get_contenthash() === sha1('')) {
// even when 'file_storage::content_exists()' returns true this may be an empty
// content for the file that was not actually downloaded
$contentexists = false;
}
$now = time();
if ($file->get_referencelastsync() + $file->get_referencelifetime() >= $now && !$file->get_status() && $contentexists) {
// we already have the content in moodle filepool and it was synchronised recently.
// Repositories may overwrite it if they want to force synchronisation anyway!
return;
} else {
// attempt to get a file
try {
$fileinfo = $this->get_file($file->get_reference());
if (isset($fileinfo['path'])) {
list($contenthash, $filesize, $newfile) = $fs->add_file_to_pool($fileinfo['path']);
// set this file and other similar aliases synchronised
$lifetime = $this->get_reference_file_lifetime($file->get_reference());
$file->set_synchronized($contenthash, $filesize, 0, $lifetime);
} else {
throw new moodle_exception('errorwhiledownload', 'repository', '', '');
}
} catch (Exception $e) {
if ($contentexists) {
// better something than nothing. We have a copy of file. It's sync time
// has expired but it is still very likely that it is the last version
} else {
throw $e;
}
}
}
}
}
}
}
