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