353 lines
15 KiB
PHP
353 lines
15 KiB
PHP
<?php
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// This file is part of GNU social - https://www.gnu.org/software/social
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//
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// GNU social is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// GNU social is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
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/**
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* The StoreRemoteMedia plugin downloads remotely attached files to local server.
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*
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* @package GNUsocial
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* @author Mikael Nordfeldth
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* @author Stephen Paul Weber
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* @author Mikael Nordfeldth
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* @author Miguel Dantas
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* @author Diogo Peralta Cordeiro
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* @copyright 2015-2016, 2019-2021 Free Software Foundation, Inc http://www.fsf.org
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
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class StoreRemoteMediaPlugin extends Plugin
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{
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const PLUGIN_VERSION = '3.0.0';
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// settings which can be set in config.php with addPlugin('StoreRemoteMedia', 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 $thumbnail_width = null;
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public $thumbnail_height = 128;
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public $thumbnail_crop = true;
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public $max_size = 10 * 1024 * 1024; // 10MiB max image size by default
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protected $imgData = [];
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/**
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* Initialize the StoreRemoteMedia plugin and set up the environment it needs for it.
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* Returns true if it initialized properly, the exception object if it
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* doesn't.
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*/
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public function initialize()
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{
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parent::initialize();
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if (is_null($this->thumbnail_width)) {
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$this->thumbnail_width = common_config('thumbnail', 'width');
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$this->thumbnail_height = common_config('thumbnail', 'height');
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$this->thumbnail_crop = common_config('thumbnail', 'crop');
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$this->max_size = common_get_preferred_php_upload_limit();
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}
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$this->domain_whitelist = array_merge($this->domain_whitelist, $this->append_whitelist);
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}
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/**
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* This event executes when GNU social is creating a file thumbnail entry in
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* the database. We glom onto this to fetch remote attachments.
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*
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* @param $file File the file of the created thumbnail
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* @param &$imgPath string = the path to the created thumbnail
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* @param $media string = media type
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* @return bool
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* @throws AlreadyFulfilledException
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* @throws FileNotFoundException
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* @throws FileNotStoredLocallyException
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* @throws HTTP_Request2_Exception
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* @throws ServerException
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*/
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public function onCreateFileImageThumbnailSource(File $file, &$imgPath, string $media): bool
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{
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// If we are on a private node, we won't do any remote calls (just as a precaution until
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// we can configure this from config.php for the private nodes)
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if (common_config('site', 'private')) {
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return true;
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}
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// If there is a local filename, it is either a local file already or has already been downloaded.
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if (!$file->isStoredRemotely()) {
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common_debug(sprintf('File id==%d isn\'t a non-fetched remote file (%s), so nothing StoreRemoteMedia '.
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'should handle.', $file->getID(), _ve($file->filename)));
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return true;
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}
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try {
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File_thumbnail::byFile($file);
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// If we don't get the exception `No result found on File_thumbnail lookup.` then Embed has already handled it most likely.
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return true;
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} catch (NoResultException $e) {
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// We can move on
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}
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$url = $file->getUrl();
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if (substr($url, 0, 7) == 'file://') {
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$filename = substr($url, 7);
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$info = getimagesize($filename);
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$filename = basename($filename);
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$width = $info[0];
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$height = $info[1];
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} else {
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$this->checkWhitelist($url);
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$head = (new HTTPClient())->head($url);
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$headers = $head->getHeader();
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$headers = array_change_key_case($headers, CASE_LOWER);
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try {
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$is_image = $this->isRemoteImage($url, $headers);
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if ($is_image == true) {
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$file_size = $this->getRemoteFileSize($url, $headers);
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if (($file_size!=false) && ($file_size > $this->max_size)) {
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common_debug("Went to store remote thumbnail of size " . $file_size .
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" but the upload limit is " . $this->max_size . " so we aborted.");
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return false;
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}
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} else {
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return false;
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}
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} catch (Exception $err) {
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common_debug("Could not determine size of remote image, aborted local storage.");
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throw $err;
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}
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// First we download the file to memory and test whether it's actually an image file
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// FIXME: To support remote video/whatever files, this needs reworking.
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common_debug(sprintf(
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'Downloading remote image for file id==%u with URL: %s',
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$file->getID(),
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$url
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));
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try {
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$imgData = HTTPClient::quickGet($url);
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if (isset($imgData)) {
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list($filename, $filehash, $width, $height) = $this->validateAndWriteImage(
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$imgData,
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$url,
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$headers,
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$file->getID()
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);
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} else {
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throw new UnsupportedMediaException('HTTPClient returned an empty result');
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}
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} catch (UnsupportedMediaException $e) {
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// Couldn't find anything that looks like an image, nothing to do
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common_debug("StoreRemoteMedia was not able to find an image for URL `{$url}`: " . $e->getMessage());
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return false;
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}
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}
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try {
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// Update our database for the file record
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$orig = clone($file);
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$file->filename = $filename;
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$file->filehash = $filehash;
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$file->width = $width;
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$file->height = $height;
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// Throws exception on failure.
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$file->updateWithKeys($orig);
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} catch (Exception $err) {
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common_log(LOG_ERR, "Went to update a file entry to the database in " .
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"StoreRemoteMediaPlugin::storeRemoteThumbnail but encountered error: ".$err);
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throw $err;
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}
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// Out
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$imgPath = $file->getPath();
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return !file_exists($imgPath);
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}
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/**
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* Check the file size of a remote file using a HEAD request and checking
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* the content-length variable returned. This isn't 100% foolproof but is
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* reliable enough for our purposes.
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*
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* @return string|bool the file size if it succeeds, false otherwise.
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*/
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private function getRemoteFileSize($url, $headers = null)
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{
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try {
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if ($headers === null) {
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if (!common_valid_http_url($url)) {
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common_log(LOG_ERR, "Invalid URL in StoreRemoteMedia::getRemoteFileSize()");
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return false;
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}
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$head = (new HTTPClient())->head($url);
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$headers = $head->getHeader();
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$headers = array_change_key_case($headers, CASE_LOWER);
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}
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return isset($headers['content-length']) ? $headers['content-length'] : false;
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} catch (Exception $err) {
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common_log(LOG_ERR, __CLASS__.': getRemoteFileSize on URL : '._ve($url).
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' threw exception: '.$err->getMessage());
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return false;
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}
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}
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/**
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* A private helper function that uses a CURL lookup to check the mime type
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* of a remote URL to see it it's an image.
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*
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* @return bool true if the remote URL is an image, or false otherwise.
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*/
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private function isRemoteImage($url, $headers = null)
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{
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if (empty($headers)) {
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if (!common_valid_http_url($url)) {
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common_log(LOG_ERR, "Invalid URL in StoreRemoteMedia::isRemoteImage()");
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return false;
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}
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$head = (new HTTPClient())->head($url);
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$headers = $head->getHeader();
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$headers = array_change_key_case($headers, CASE_LOWER);
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}
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return !empty($headers['content-type']) && common_get_mime_media($headers['content-type']) === 'image';
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}
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/**
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* Validate that $imgData is a valid image before writing it to
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* disk, as well as resizing it to at most $this->thumbnail_width
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* by $this->thumbnail_height
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*
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* @param $imgData - The image data to validate. Taken by reference to avoid copying
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* @param string|null $url - The url where the image came from, to fetch metadata
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* @param array|null $headers - The headers possible previous request to $url
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* @param int|null $file_id - The id of the file this image belongs to, used for logging
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*/
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protected function validateAndWriteImage(&$imgData, ?string $url = null, ?array $headers = null, ?int $file_id = null) : array
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{
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$info = @getimagesizefromstring($imgData);
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// array indexes documented on php.net:
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// https://php.net/manual/en/function.getimagesize.php
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if ($info === false) {
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throw new UnsupportedMediaException(_m('Remote file format was not identified as an image.'), $url);
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} elseif (!$info[0] || !$info[1]) {
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throw new UnsupportedMediaException(_m('Image file had impossible geometry (0 width or height)'));
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}
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$width = min($info[0], $this->thumbnail_width);
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$height = min($info[1], $this->thumbnail_height);
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$filehash = hash(File::FILEHASH_ALG, $imgData);
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try {
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if (!empty($url)) {
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$original_name = HTTPClient::get_filename($url, $headers);
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}
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$filename = MediaFile::encodeFilename($original_name ?? _m('Untitled attachment'), $filehash);
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$filepath = File::path($filename);
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// Write the file to disk. Throw Exception on failure
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if (!file_exists($filepath)) {
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if (strpos($filepath, INSTALLDIR) !== 0 || file_put_contents($filepath, $imgData) === false) {
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throw new ServerException(_m('Could not write downloaded file to disk.'));
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}
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if (common_get_mime_media(MediaFile::getUploadedMimeType($filepath)) !== 'image') {
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@unlink($filepath);
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throw new UnsupportedMediaException(
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_m('Remote file format was not identified as an image.'),
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$url
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);
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}
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// If the image is not of the desired size, resize it
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if ($info[0] > $this->thumbnail_width || $info[1] > $this->thumbnail_height) {
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// Temporary object, not stored in DB
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$img = new ImageFile(-1, $filepath);
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// Get proper aspect ratio width and height before lookup
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// We have to do it through an ImageFile object because of orientation etc.
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// Only other solution would've been to rotate + rewrite uploaded files
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// which we don't want to do because we like original, untouched data!
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list($width, $height, $x, $y, $w, $h) = $img->scaleToFit($this->thumbnail_width, $this->thumbnail_height, $this->thumbnail_crop);
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// The boundary box for our resizing
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$box = [
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'width' => $width, 'height' => $height,
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'x' => $x, 'y' => $y,
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'w' => $w, 'h' => $h,
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];
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$width = $box['width'];
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$height = $box['height'];
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$img->resizeTo($filepath, $box);
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}
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} else {
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throw new AlreadyFulfilledException('A thumbnail seems to already exist for remote file' .
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($file_id ? 'with id==' . $file_id : '') . ' at path ' . $filepath);
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}
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} catch (AlreadyFulfilledException $e) {
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// Carry on
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} catch (Exception $err) {
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common_log(LOG_ERR, "Went to write a thumbnail to disk in StoreRemoteMediaPlugin::storeRemoteThumbnail " .
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"but encountered error: {$err}");
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throw $err;
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} finally {
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unset($imgData);
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}
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return [$filename, $filehash, $width, $height];
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}
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/**
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* @return bool false on no check made, provider name on success
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* @throws ServerException if check is made but fails
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*/
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protected function checkWhitelist($url)
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{
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if (!$this->check_whitelist) {
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return false; // indicates "no check made"
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}
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$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 $provider; // we trust this source, return provider name
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}
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}
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throw new ServerException(sprintf(_m('Domain not in remote thumbnail source whitelist: %s'), $host));
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}
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/**
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* Event raised when GNU social polls the plugin for information about it.
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* Adds this plugin's version information to $versions array
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*
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* @param &$versions array inherited from parent
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* @return bool true hook value
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*/
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public function onPluginVersion(array &$versions): bool
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{
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$versions[] = ['name' => 'StoreRemoteMedia',
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'version' => self::PLUGIN_VERSION,
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'author' => 'Mikael Nordfeldth, Diogo Peralta Cordeiro',
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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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} |