gnu-social/plugins/StoreRemoteMedia/StoreRemoteMediaPlugin.php

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