224 lines
8.8 KiB
PHP
224 lines
8.8 KiB
PHP
<?php
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if (!defined('GNUSOCIAL')) { exit(1); }
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// FIXME: To support remote video/whatever files, this plugin needs reworking.
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class StoreRemoteMediaPlugin extends Plugin
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{
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const PLUGIN_VERSION = '2.0.0';
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// settings which can be set in config.php with addPlugin('Embed', array('param'=>'value', ...));
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// WARNING, these are _regexps_ (slashes added later). Always escape your dots and end your strings
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public $domain_whitelist = [
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// hostname => service provider
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'^i\d*\.ytimg\.com$' => 'YouTube',
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'^i\d*\.vimeocdn\.com$' => 'Vimeo',
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];
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public $append_whitelist = []; // fill this array as domain_whitelist to add more trusted sources
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public $check_whitelist = false; // security/abuse precaution
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public $domain_blacklist = [];
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public $check_blacklist = false;
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public $max_image_bytes = 10 * 1024 * 1024; // 10MiB max image size by default
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protected $imgData = [];
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// these should be declared protected everywhere
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public function initialize()
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{
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parent::initialize();
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$this->domain_whitelist = array_merge($this->domain_whitelist, $this->append_whitelist);
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}
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public function onCreateFileImageThumbnailSource(File $file, &$imgPath, $media=null)
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{
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// If we are on a private node, we won't do any remote calls (just as a precaution until
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// we can configure this from config.php for the private nodes)
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if (common_config('site', 'private')) {
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return true;
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}
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if ($media !== 'image') {
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return true;
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}
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// If there is a local filename, it is either a local file already or has already been downloaded.
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if (!empty($file->filename)) {
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return true;
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}
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$remoteUrl = $file->getUrl();
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if (empty($remoteUrl)) {
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return true;
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}
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if (!$this->checkWhiteList($remoteUrl) ||
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!$this->checkBlackList($remoteUrl)) {
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return true;
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}
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// Relative URL, something's off
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if (empty(parse_url($remoteUrl, PHP_URL_HOST))) {
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common_err("StoreRemoteMedia found a url without host (\"{$remoteUrl}\") for file with id = {$file->id}");
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return true;
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}
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try {
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$http = new HTTPClient();
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common_debug(sprintf('Performing HEAD request for remote file id==%u to avoid '.
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'unnecessarily downloading too large files. URL: %s',
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$file->getID(), $remoteUrl));
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$url = $remoteUrl;
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$head = $http->head($remoteUrl);
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$remoteUrl = $head->getEffectiveUrl(); // to avoid going through redirects again
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if (empty($remoteUrl)) {
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common_log(LOG_ERR, "URL after redirects is somehow empty, for URL {$url}");
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return true;
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}
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if (!$this->checkBlackList($remoteUrl)) {
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common_log(LOG_WARN, sprintf('%s: Non-blacklisted URL %s redirected to blacklisted URL %s',
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__CLASS__, $file->getUrl(), $remoteUrl));
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return true;
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}
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$headers = $head->getHeader();
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$headers = array_change_key_case($headers, CASE_LOWER);
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$filesize = isset($headers['content-length']) ?: $file->getSize();
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if (empty($filesize)) {
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// file size not specified on remote server
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common_debug(sprintf('%s: Ignoring remote media because we did not get a ' .
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'content length for file id==%u', __CLASS__, $file->getID()));
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return true;
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} elseif ($filesize > $this->max_image_bytes) {
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//FIXME: When we perhaps start fetching videos etc. we'll need to
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// differentiate max_image_bytes from that...
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// file too big according to plugin configuration
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common_debug(sprintf('%s: Skipping remote media because content length (%u) ' .
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'is larger than plugin configured max_image_bytes (%u) ' .
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'for file id==%u', __CLASS__, intval($filesize),
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$this->max_image_bytes, $file->getID()));
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return true;
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} elseif ($filesize > common_config('attachments', 'file_quota')) {
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// file too big according to site configuration
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common_debug(sprintf('%s: Skipping remote media because content length (%u) ' .
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'is larger than file_quota (%u) for file id==%u',
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__CLASS__, intval($filesize),
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common_config('attachments', 'file_quota'), $file->getID()));
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return true;
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}
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// Then we download the file to memory and test whether it's actually an image file
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common_debug(sprintf('Downloading remote file id=%u (should be size %u) ' .
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'with effective URL: %s', $file->getID(), $filesize, _ve($remoteUrl)));
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$imgData = HTTPClient::quickGet($remoteUrl);
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} catch (HTTP_Request2_ConnectionException $e) {
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common_log(LOG_ERR, __CLASS__.': '._ve(get_class($e)).' on URL: ' .
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_ve($file->getUrl()).' threw exception: '.$e->getMessage());
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return true;
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}
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$info = @getimagesizefromstring($imgData);
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if ($info === false) {
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throw new UnsupportedMediaException(_('Remote file format was not identified as an image.'), $remoteUrl);
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} elseif (!$info[0] || !$info[1]) {
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throw new UnsupportedMediaException(_('Image file had impossible geometry (0 width or height)'));
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}
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$filehash = hash(File::FILEHASH_ALG, $imgData);
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try {
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// Exception will be thrown before $file is set to anything, so old $file value will be kept
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$file = File::getByHash($filehash);
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//FIXME: Add some code so we don't have to store duplicate File rows for same hash files.
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} catch (NoResultException $e) {
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$original_name = HTTPClient::get_filename($remoteUrl, $headers);
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$filename = MediaFile::encodeFilename($original_name, $filehash);
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$fullpath = File::path($filename);
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common_debug("StoreRemoteMedia retrieved url {$remoteUrl} for file with id={$file->id} " .
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"and will store in {$fullpath}");
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// Write the file to disk if it doesn't exist yet. Throw Exception on failure.
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if ((!file_exists($fullpath) || substr($fullpath, 0, strlen(INSTALLDIR)) != INSTALLDIR) &&
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file_put_contents($fullpath, $imgData) === false) {
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throw new ServerException(_('Could not write downloaded file to disk.'));
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}
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// Updated our database for the file record
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$orig = clone($file);
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$file->filehash = $filehash;
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$file->filename = $filename;
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$file->width = $info[0]; // array indexes documented on php.net:
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$file->height = $info[1]; // https://php.net/manual/en/function.getimagesize.php
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// Throws exception on failure.
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$file->updateWithKeys($orig);
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}
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// Get rid of the file from memory
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unset($imgData);
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// Output
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$imgPath = $file->getPath();
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return false;
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}
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/**
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* @return boolean true if given url passes blacklist check
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*/
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protected function checkBlackList($url)
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{
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if (!$this->check_blacklist) {
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return true;
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}
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$host = parse_url($url, PHP_URL_HOST);
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foreach ($this->domain_blacklist as $regex => $provider) {
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if (preg_match("/$regex/", $host)) {
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return false;
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}
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}
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return true;
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}
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/***
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* @return boolean true if given url passes whitelist check
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*/
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protected function checkWhiteList($url)
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{
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if (!$this->check_whitelist) {
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return true;
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}
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$host = parse_url($url, PHP_URL_HOST);
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foreach ($this->domain_whitelist as $regex => $provider) {
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if (preg_match("/$regex/", $host)) {
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return true;
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}
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}
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return false;
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}
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public function onPluginVersion(array &$versions): bool
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{
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$versions[] = array('name' => 'StoreRemoteMedia',
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'version' => self::PLUGIN_VERSION,
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'author' => 'Mikael Nordfeldth',
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'homepage' => GNUSOCIAL_ENGINE_URL,
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'description' =>
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// TRANS: Plugin description.
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_m('Plugin for downloading remotely attached files to local server.'));
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return true;
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}
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}
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