346 lines
10 KiB
PHP
346 lines
10 KiB
PHP
<?php
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namespace PrivateBin\Data;
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use Exception;
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use Google\Cloud\Core\Exception\NotFoundException;
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use Google\Cloud\Storage\StorageClient;
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use PrivateBin\Json;
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class GoogleCloudStorage extends AbstractData
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{
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/**
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* GCS client
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*
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* @access private
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* @static
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* @var StorageClient
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*/
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private static $_client = null;
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/**
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* GCS bucket
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*
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* @access private
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* @static
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* @var Bucket
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*/
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private static $_bucket = null;
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/**
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* object prefix
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*
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* @access private
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* @static
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* @var string
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*/
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private static $_prefix = 'pastes';
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/**
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* returns a Google Cloud Storage data backend.
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*
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* @access public
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* @static
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* @param array $options
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* @return GoogleCloudStorage
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*/
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public static function getInstance(array $options)
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{
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// if needed initialize the singleton
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if (!(self::$_instance instanceof self)) {
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self::$_instance = new self;
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}
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$bucket = null;
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if (getenv('PRIVATEBIN_GCS_BUCKET')) {
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$bucket = getenv('PRIVATEBIN_GCS_BUCKET');
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}
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if (is_array($options) && array_key_exists('bucket', $options)) {
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$bucket = $options['bucket'];
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}
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if (is_array($options) && array_key_exists('prefix', $options)) {
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self::$_prefix = $options['prefix'];
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}
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if (empty(self::$_client)) {
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self::$_client = class_exists('StorageClientStub', false) ?
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new \StorageClientStub(array()) :
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new StorageClient(array('suppressKeyFileNotice' => true));
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}
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self::$_bucket = self::$_client->bucket($bucket);
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return self::$_instance;
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}
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/**
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* returns the google storage object key for $pasteid in self::$_bucket.
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*
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* @access private
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* @param $pasteid string to get the key for
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* @return string
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*/
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private function _getKey($pasteid)
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{
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if (self::$_prefix != '') {
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return self::$_prefix . '/' . $pasteid;
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}
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return $pasteid;
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}
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/**
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* Uploads the payload in the self::$_bucket under the specified key.
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* The entire payload is stored as a JSON document. The metadata is replicated
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* as the GCS object's metadata except for the fields attachment, attachmentname
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* and salt.
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*
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* @param $key string to store the payload under
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* @param $payload array to store
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* @return bool true if successful, otherwise false.
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*/
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private function _upload($key, $payload)
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{
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$metadata = array_key_exists('meta', $payload) ? $payload['meta'] : array();
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unset($metadata['attachment'], $metadata['attachmentname'], $metadata['salt']);
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foreach ($metadata as $k => $v) {
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$metadata[$k] = strval($v);
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}
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try {
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self::$_bucket->upload(Json::encode($payload), array(
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'name' => $key,
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'chunkSize' => 262144,
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'predefinedAcl' => 'private',
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'metadata' => array(
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'content-type' => 'application/json',
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'metadata' => $metadata,
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),
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));
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} catch (Exception $e) {
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error_log('failed to upload ' . $key . ' to ' . self::$_bucket->name() . ', ' .
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trim(preg_replace('/\s\s+/', ' ', $e->getMessage())));
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return false;
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}
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return true;
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}
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/**
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* @inheritDoc
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*/
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public function create($pasteid, array $paste)
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{
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if ($this->exists($pasteid)) {
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return false;
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}
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return $this->_upload($this->_getKey($pasteid), $paste);
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}
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/**
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* @inheritDoc
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*/
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public function read($pasteid)
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{
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try {
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$o = self::$_bucket->object($this->_getKey($pasteid));
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$data = $o->downloadAsString();
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return Json::decode($data);
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} catch (NotFoundException $e) {
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return false;
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} catch (Exception $e) {
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error_log('failed to read ' . $pasteid . ' from ' . self::$_bucket->name() . ', ' .
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trim(preg_replace('/\s\s+/', ' ', $e->getMessage())));
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return false;
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}
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}
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/**
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* @inheritDoc
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*/
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public function delete($pasteid)
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{
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$name = $this->_getKey($pasteid);
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try {
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foreach (self::$_bucket->objects(array('prefix' => $name . '/discussion/')) as $comment) {
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try {
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self::$_bucket->object($comment->name())->delete();
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} catch (NotFoundException $e) {
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// ignore if already deleted.
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}
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}
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} catch (NotFoundException $e) {
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// there are no discussions associated with the paste
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}
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try {
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self::$_bucket->object($name)->delete();
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} catch (NotFoundException $e) {
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// ignore if already deleted
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}
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}
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/**
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* @inheritDoc
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*/
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public function exists($pasteid)
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{
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$o = self::$_bucket->object($this->_getKey($pasteid));
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return $o->exists();
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}
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/**
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* @inheritDoc
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*/
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public function createComment($pasteid, $parentid, $commentid, array $comment)
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{
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if ($this->existsComment($pasteid, $parentid, $commentid)) {
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return false;
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}
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$key = $this->_getKey($pasteid) . '/discussion/' . $parentid . '/' . $commentid;
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return $this->_upload($key, $comment);
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}
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/**
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* @inheritDoc
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*/
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public function readComments($pasteid)
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{
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$comments = array();
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$prefix = $this->_getKey($pasteid) . '/discussion/';
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try {
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foreach (self::$_bucket->objects(array('prefix' => $prefix)) as $key) {
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$comment = JSON::decode(self::$_bucket->object($key->name())->downloadAsString());
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$comment['id'] = basename($key->name());
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$slot = $this->getOpenSlot($comments, (int) $comment['meta']['created']);
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$comments[$slot] = $comment;
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}
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} catch (NotFoundException $e) {
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// no comments found
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}
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return $comments;
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}
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/**
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* @inheritDoc
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*/
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public function existsComment($pasteid, $parentid, $commentid)
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{
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$name = $this->_getKey($pasteid) . '/discussion/' . $parentid . '/' . $commentid;
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$o = self::$_bucket->object($name);
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return $o->exists();
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}
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/**
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* @inheritDoc
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*/
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public function purgeValues($namespace, $time)
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{
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$path = 'config/' . $namespace;
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try {
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foreach (self::$_bucket->objects(array('prefix' => $path)) as $object) {
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$name = $object->name();
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if (strlen($name) > strlen($path) && substr($name, strlen($path), 1) !== '/') {
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continue;
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}
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$info = $object->info();
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if (key_exists('metadata', $info) && key_exists('value', $info['metadata'])) {
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$value = $info['metadata']['value'];
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if (is_numeric($value) && intval($value) < $time) {
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try {
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$object->delete();
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} catch (NotFoundException $e) {
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// deleted by another instance.
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}
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}
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}
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}
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} catch (NotFoundException $e) {
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// no objects in the bucket yet
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}
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}
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/**
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* For GoogleCloudStorage, the value will also be stored in the metadata for the
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* namespaces traffic_limiter and purge_limiter.
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* @inheritDoc
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*/
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public function setValue($value, $namespace, $key = '')
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{
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if ($key === '') {
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$key = 'config/' . $namespace;
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} else {
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$key = 'config/' . $namespace . '/' . $key;
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}
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$metadata = array('namespace' => $namespace);
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if ($namespace != 'salt') {
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$metadata['value'] = strval($value);
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}
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try {
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self::$_bucket->upload($value, array(
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'name' => $key,
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'chunkSize' => 262144,
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'predefinedAcl' => 'private',
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'metadata' => array(
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'content-type' => 'application/json',
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'metadata' => $metadata,
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),
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));
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} catch (Exception $e) {
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error_log('failed to set key ' . $key . ' to ' . self::$_bucket->name() . ', ' .
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trim(preg_replace('/\s\s+/', ' ', $e->getMessage())));
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return false;
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}
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return true;
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}
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/**
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* @inheritDoc
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*/
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public function getValue($namespace, $key = '')
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{
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if ($key === '') {
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$key = 'config/' . $namespace;
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} else {
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$key = 'config/' . $namespace . '/' . $key;
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}
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try {
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$o = self::$_bucket->object($key);
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return $o->downloadAsString();
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} catch (NotFoundException $e) {
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return '';
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}
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}
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/**
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* @inheritDoc
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*/
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protected function _getExpiredPastes($batchsize)
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{
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$expired = array();
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$now = time();
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$prefix = self::$_prefix;
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if ($prefix != '') {
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$prefix .= '/';
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}
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try {
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foreach (self::$_bucket->objects(array('prefix' => $prefix)) as $object) {
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$metadata = $object->info()['metadata'];
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if ($metadata != null && array_key_exists('expire_date', $metadata)) {
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$expire_at = intval($metadata['expire_date']);
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if ($expire_at != 0 && $expire_at < $now) {
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array_push($expired, basename($object->name()));
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}
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}
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if (count($expired) > $batchsize) {
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break;
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}
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}
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} catch (NotFoundException $e) {
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// no objects in the bucket yet
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}
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return $expired;
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}
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}
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