gnu-social/plugins/StoreRemoteMedia/StoreRemoteMedia.php

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<?php
declare(strict_types = 1);
// {{{ License
// 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/>.
// }}}
namespace Plugin\StoreRemoteMedia;
use App\Core\DB\DB;
use App\Core\Event;
use App\Core\GSFile;
use App\Core\HTTPClient;
use function App\Core\I18n\_m;
use App\Core\Log;
use App\Core\Modules\Plugin;
use App\Entity\Note;
use App\Util\Common;
use App\Util\Exception\DuplicateFoundException;
use App\Util\Exception\ServerException;
use App\Util\Exception\TemporaryFileException;
use App\Util\TemporaryFile;
use Component\Attachment\Entity\AttachmentThumbnail;
use Component\Attachment\Entity\AttachmentToLink;
use Component\Attachment\Entity\AttachmentToNote;
use Component\Link\Entity\Link;
use Symfony\Contracts\HttpClient\Exception\ClientExceptionInterface;
use Symfony\Contracts\HttpClient\Exception\RedirectionExceptionInterface;
use Symfony\Contracts\HttpClient\Exception\ServerExceptionInterface;
use Symfony\Contracts\HttpClient\Exception\TransportExceptionInterface;
/**
* 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 StoreRemoteMedia extends Plugin
{
public function version(): string
{
return '3.0.0';
}
/**
* Settings which can be set in social.local.yaml
* WARNING, these are _regexps_ (slashes added later). Always escape your dots and end ('$') your strings
*/
public bool $check_whitelist = false;
public bool $check_blacklist = false;
public array $domain_whitelist = [
// hostname
'.*', // Default to allowing any host
];
public array $domain_blacklist = [];
2021-02-21 10:35:02 +00:00
// Whether to maintain a copy of the original media or only a thumbnail of it
private function getStoreOriginal(): bool
{
return Common::config('plugin_store_remote_media', 'store_original');
}
private function getMaxFileSize(): int
{
return min(Common::config('plugin_store_remote_media', 'max_file_size'), Common::config('attachments', 'file_quota'));
}
private function getSmartCrop(): bool
{
return Common::config('plugin_store_remote_media', 'smart_crop');
}
/**
* @throws DuplicateFoundException
* @throws ServerException
* @throws TemporaryFileException
*/
public function onNewLinkFromNote(Link $link, Note $note): bool
{
// Embed is the plugin to handle these
if ($link->getMimetypeMajor() === 'text') {
return Event::next;
}
// Is this URL trusted?
if (!$this->allowedLink($link->getUrl())) {
Log::info("Blocked URL ({$link->getUrl()}) in StoreRemoteMedia->onNewLinkFromNote.");
return Event::next;
}
// Have we handled it already?
$attachment_to_link = DB::find(
'attachment_to_link',
['link_id' => $link->getId()],
);
// If it was handled already
// XXX: Maybe it would be interesting to have retroactive application of $this->getOriginal here
if (!\is_null($attachment_to_link)) {
// Relate the note with the existing attachment
DB::persist(AttachmentToNote::create([
'attachment_id' => $attachment_to_link->getAttachmentId(),
'note_id' => $note->getId(),
]));
DB::flush();
return Event::stop;
} else {
// Validate if the URL really does point to a remote image
$head = HTTPClient::head($link->getUrl());
try {
$headers = $head->getHeaders();
} catch (ClientExceptionInterface|RedirectionExceptionInterface|ServerExceptionInterface|TransportExceptionInterface $e) {
Log::debug('StoreRemoteMedia->onNewLinkFromNote@HTTPHead->getHeaders: ' . $e->getMessage(), [$e]);
return Event::next;
}
// Does it respect the file quota?
$file_size = $headers['content-length'][0] ?? null;
$max_size = $this->getMaxFileSize();
if (\is_null($file_size) || $file_size > $max_size) {
Log::debug("Went to download remote media of size {$file_size} but the plugin's filesize limit is {$max_size} so we aborted in StoreRemoteMedia->onNewLinkFromNote.");
return Event::next;
}
// Retrieve media
$get_response = HTTPClient::get($link->getUrl());
$media = $get_response->getContent();
$mimetype = $get_response->getHeaders()['content-type'][0] ?? null;
unset($get_response);
// TODO: Add functionality to specify allowed content types to retrieve here
// Ensure we still want to handle it
if ($mimetype != $link->getMimetype()) {
$link->setMimetype($mimetype);
DB::persist($link);
DB::flush();
if ($link->getMimetypeMajor() === 'text') {
return Event::next;
}
}
// We can ignore empty files safely, the user can guess them (:
if (!empty($media)) {
// Create an attachment for this
$temp_file = new TemporaryFile();
$temp_file->write($media);
$attachment = GSFile::storeFileAsAttachment($temp_file);
// Relate the link with the attachment
// TODO: Create a function that gets the title from content disposition or URL when such header isn't available
DB::persist(AttachmentToLink::create([
'link_id' => $link->getId(),
'attachment_id' => $attachment->getId(),
]));
// Relate the note with the attachment
DB::persist(AttachmentToNote::create([
'attachment_id' => $attachment->getId(),
'note_id' => $note->getId(),
]));
DB::flush();
// Should we create a thumb and delete the original file?
if (!$this->getStoreOriginal()) {
$thumbnail = AttachmentThumbnail::getOrCreate(
attachment: $attachment,
size: 'medium',
crop: $this->getSmartCrop(),
);
$attachment->deleteStorage();
}
}
return Event::stop;
}
}
/**
* @return bool true if allowed by the lists, false otherwise
*/
private function allowedLink(string $url): bool
{
$passed_whitelist = !$this->check_whitelist;
$passed_blacklist = !$this->check_blacklist;
if ($this->check_whitelist) {
$passed_whitelist = false; // don't trust be default
$host = parse_url($url, \PHP_URL_HOST);
foreach ($this->domain_whitelist as $regex => $provider) {
if (preg_match("/{$regex}/", $host)) {
$passed_whitelist = true; // we trust this source
}
}
}
if ($this->check_blacklist) {
// assume it passed by default
$host = parse_url($url, \PHP_URL_HOST);
foreach ($this->domain_blacklist as $regex => $provider) {
if (preg_match("/{$regex}/", $host)) {
$passed_blacklist = false; // we blocked this source
}
}
}
return $passed_whitelist && $passed_blacklist;
}
/**
* Event raised when GNU social polls the plugin for information about it.
* Adds this plugin's version information to $versions array
*
* @param array $versions inherited from parent
*
* @return bool true hook value
*/
public function onPluginVersion(array &$versions): bool
{
$versions[] = [
'name' => 'StoreRemoteMedia',
'version' => $this->version(),
'author' => 'Mikael Nordfeldth, Diogo Peralta Cordeiro',
'homepage' => GNUSOCIAL_PROJECT_URL,
'description', // TRANS: Plugin description. => _m('Plugin for downloading remotely attached files to local server.'),
];
return Event::next;
}
}