/**
* Construct an object of CloudStorageClient.
*
* @param string $bucket The name of the bucket.
* @param string $object The name of the object, or null if there is no
* object.
* @param resource $context The stream context to use.
*/
public function __construct($bucket, $object = null, $context = null)
{
$this->bucket_name = $bucket;
$this->object_name = $object;
if (!isset($context)) {
$context = stream_context_get_default();
}
$context_array = stream_context_get_options($context);
if (array_key_exists("gs", $context_array)) {
$this->context_options = array_merge(self::$default_gs_context_options, $context_array["gs"]);
} else {
$this->context_options = self::$default_gs_context_options;
}
$this->anonymous = util\FindByKeyOrNull($this->context_options, "anonymous");
$this->url = $this->createObjectUrl($bucket, $object);
}
/**
* Serve a Google Cloud Storage file as the response.
*
* @param string $gcs_filename The name of the Google Cloud Storage object to
* serve.
* @param mixed $options Array of additional options for serving the object.
* content_type: Content-Type to override when known.
* save_as: If True then send the file as an attachment.
* start: Start index of content-range to send.
* end: End index of content-range to send. End index is inclusive.
* use_range: Use provided content range from the request's Range header.
* Mutually exclusive with start and end.
*
* @throws InvalidArgumentException If invalid options are supplied.
*/
public static function serve($gcs_filename, $options = [])
{
$extra_options = array_diff(array_keys($options), self::$serve_options);
if (!empty($extra_options)) {
throw new \InvalidArgumentException('Invalid options supplied: ' . implode(',', $extra_options));
}
// Determine the range to send
$start = util\FindByKeyOrNull($options, "start");
$end = util\FindByKeyOrNull($options, "end");
$use_range = util\FindByKeyOrNull($options, "use_range");
$request_range_header = util\FindByKeyOrNull($_SERVER, "HTTP_RANGE");
$range_header = BlobstoreService::checkRanges($start, $end, $use_range, $request_range_header);
$save_as = util\FindByKeyOrNull($options, "save_as");
if (isset($save_as) && !is_string($save_as)) {
throw new \InvalidArgumentException("Unexpected value for save_as.");
}
$blob_key = BlobstoreService::createGsKey($gcs_filename);
BlobstoreService::sendHeader(self::BLOB_KEY_HEADER, $blob_key);
if (isset($range_header)) {
BlobstoreService::sendHeader(self::BLOB_RANGE_HEADER, $range_header);
}
$content_type = util\FindByKeyOrNull($options, "content_type");
if (isset($content_type)) {
BlobstoreService::sendHeader("Content-Type", $content_type);
}
if (isset($save_as)) {
BlobstoreService::sendHeader("Content-Disposition", sprintf("attachment; filename=%s", $save_as));
}
}
/**
* Parse the supplied path and extract the bucket and object names from it.
* It is possible that there is no object name in the path and a null will be
* returned in the $object parameters if this is the case.
*/
private function getBucketAndObjectFromPath($path, &$bucket, &$object)
{
// Decompose the $path into the GCS url components and check
$url_parts = parse_url($path);
if ($url_parts === false) {
return false;
}
if ($url_parts['scheme'] !== 'gs' || empty($url_parts['host'])) {
trigger_error(sprintf("Invalid Google Cloud Storage path: %s", $path), E_USER_ERROR);
return false;
}
$bucket = $url_parts['host'];
$object = null;
$path = util\FindByKeyOrNull($url_parts, 'path');
if (isset($path) && $path !== "/") {
$object = $path;
}
return true;
}
