376 lines
13 KiB
PHP
376 lines
13 KiB
PHP
<?php
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// {{{ License
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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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/**
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* OEmbed and OpenGraph implementation for GNU social
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*
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* @package GNUsocial
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*
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* @author Mikael Nordfeldth
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* @author Stephen Paul Weber
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* @author hannes
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* @author Mikael Nordfeldth
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* @author Miguel Dantas
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* @author Hugo Sales <hugo@hsal.es>
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* @author Diogo Peralta Cordeiro <mail@diogo.site>
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* @copyright 2014-2021 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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namespace Plugin\Embed;
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use App\Core\Cache;
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use App\Core\DB\DB;
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use App\Core\Event;
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use App\Core\GSFile;
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use App\Core\HTTPClient;
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use function App\Core\I18n\_m;
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use App\Core\Log;
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use App\Core\Modules\Plugin;
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use App\Core\Router\RouteLoader;
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use App\Core\Router\Router;
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use App\Entity\Attachment;
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use App\Entity\Link;
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use App\Entity\Note;
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use App\Util\Common;
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use App\Util\Exception\DuplicateFoundException;
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use App\Util\Exception\NotFoundException;
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use App\Util\Exception\ServerException;
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use App\Util\Formatting;
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use App\Util\TemporaryFile;
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use Embed\Embed as LibEmbed;
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use Exception;
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use Symfony\Component\HttpFoundation\Request;
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/**
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* Base class for the Embed plugin that does most of the heavy lifting to get
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* and display representations for remote content.
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*
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* @copyright 2014-2021 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 Embed extends Plugin
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{
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public function version(): string
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{
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return '3.0.0';
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}
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/**
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* Settings which can be set in social.local.yaml
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* WARNING, these are _regexps_ (slashes added later). Always escape your dots and end ('$') your strings
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*/
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public array $domain_whitelist = [
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// hostname => service provider
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'.*' => '', // Default to allowing any host
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];
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/**
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* This code executes when GNU social creates the page routing, and we hook
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* on this event to add our action handler for Embed.
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*
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* @param $m RouteLoader the router that was initialized.
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*
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* @throws Exception
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*
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* @return bool
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*
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*
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*/
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public function onAddRoute(RouteLoader $m): bool
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{
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$m->connect('oembed', 'main/oembed', Controller\Embed::class);
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$m->connect('embed', 'main/embed', Controller\Embed::class);
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return Event::next;
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}
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/**
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* Insert oembed and opengraph tags in all HTML head elements
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*/
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public function onShowHeadElements(Request $request, array &$result): bool
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{
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$matches = [];
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preg_match(',/?([^/]+)/?(.*),', $request->getPathInfo(), $matches);
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$url = match ($matches[1]) {
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'attachment' => "{$matches[1]}/{$matches[2]}",
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default => null,
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};
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if (is_null($url)) {
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foreach (['xml', 'json'] as $format) {
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$result[] = [
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'link' => [
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'rel' => 'alternate',
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'type' => "application/{$format}+oembed",
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'href' => Router::url('embed', ['format' => $format, 'url' => $url]),
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'title' => 'oEmbed',
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], ];
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}
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}
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return Event::next;
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}
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/**
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* Show this attachment enhanced with the corresponding Embed data, if available
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*
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* @param array $vars
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* @param array $res
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*
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* @return bool
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*/
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public function onViewLink(array $vars, array &$res): bool
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{
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$link = $vars['link'];
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try {
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$embed = Cache::get('attachment-embed-' . $link->getId(),
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fn () => DB::findOneBy('attachment_embed', ['link_id' => $link->getId()]));
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} catch (DuplicateFoundException $e) {
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Log::warning($e);
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return Event::next;
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} catch (NotFoundException) {
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Log::debug("Embed doesn't have a representation for the link id={$link->getId()}. Must have been stored before the plugin was enabled.");
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return Event::next;
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}
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$attributes = $embed->getImageHTMLAttributes(['class' => 'u-photo embed']);
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$res[] = Formatting::twigRenderFile('embed/embedView.html.twig',
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['embed' => $embed, 'attributes' => $attributes, 'link' => $link]);
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return Event::stop;
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}
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/**
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* Save embedding information for an Attachment, if applicable.
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*
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* @param Link $link
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* @param Note $note
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*
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*@throws DuplicateFoundException
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*
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* @return bool
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*
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*/
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public function onNewLinkFromNote(Link $link, Note $note): bool
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{
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// Only handle text mime
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$mimetype = $link->getMimetype();
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if (!(Formatting::startsWith($mimetype, 'text/html') || Formatting::startsWith($mimetype, 'application/xhtml+xml'))) {
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return Event::next;
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}
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// Ignore if already handled
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$attachment_embed = DB::find('attachment_embed', ['link_id' => $link->getId()]);
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if (!is_null($attachment_embed)) {
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return Event::next;
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}
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// If an attachment already exist, do not create an Embed for it. Some other plugin must have done things
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$link_to_attachment = DB::find('link_to_attachment', ['link_id' => $link->getId()]);
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if (!is_null($link_to_attachment)) {
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$attachment_id = $link_to_attachment->getAttachmentId();
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try {
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$attachment = DB::findOneBy('attachment', ['id' => $attachment_id]);
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$attachment->livesIncrementAndGet();
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return Event::next;
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} catch (DuplicateFoundException | NotFoundException $e) {
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Log::error($e);
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}
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}
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// Create an Embed representation for this URL
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$embed_data = $this->getEmbedLibMetadata($link->getUrl());
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$embed_data['link_id'] = $link->getId();
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$img_data = $this->downloadThumbnail($embed_data['thumbnail_url']);
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switch ($img_data) {
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case null: // URL isn't usable
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$embed_data['thumbnail_url'] = null;
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// no break
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case false: // Thumbnail isn't acceptable
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DB::persist($attachment = Attachment::create(['mimetype' => $link->getMimetype()]));
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Event::handle('AttachmentStoreNew', [&$attachment]);
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break;
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default: // String is valid image data
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$temp_file = new TemporaryFile();
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$temp_file->write($img_data);
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$attachment = GSFile::sanitizeAndStoreFileAsAttachment($temp_file);
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$embed_data['attachment_id'] = $attachment->getId();
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}
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$embed_data['attachment_id'] = $attachment->getId();
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DB::persist(Entity\AttachmentEmbed::create($embed_data));
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DB::flush();
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return Event::stop;
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}
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/**
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* Perform an oEmbed or OpenGraph lookup for the given $url.
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*
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* Some known hosts are whitelisted with API endpoints where we
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* know they exist but autodiscovery data isn't available.
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*
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* Throws exceptions on failure.
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*
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* @param string $url
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*
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* @return array
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*/
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private function getEmbedLibMetadata(string $url): array
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{
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Log::info("Trying to find Embed data for {$url} with 'oscarotero/Embed'");
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$embed = new LibEmbed();
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$info = $embed->get($url);
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$metadata['title'] = $info->title;
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$metadata['description'] = $info->description;
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$metadata['author_name'] = $info->authorName;
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$metadata['author_url'] = (string) $info->authorUrl;
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$metadata['provider_name'] = $info->providerName;
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$metadata['provider_url'] = (string) $info->providerUrl;
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if (!is_null($info->image)) {
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$thumbnail_url = (string) $info->image;
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} else {
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$thumbnail_url = (string) $info->favicon;
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}
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// Check thumbnail URL validity
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$metadata['thumbnail_url'] = $thumbnail_url;
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return self::normalizeEmbedLibMetadata($metadata);
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}
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/**
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* Normalize fetched info.
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*
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* @param array $metadata
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*
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* @return array
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*/
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private static function normalizeEmbedLibMetadata(array $metadata): array
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{
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if (isset($metadata['thumbnail_url'])) {
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// sometimes sites serve the path, not the full URL, for images
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// let's "be liberal in what you accept from others"!
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// add protocol and host if the thumbnail_url starts with /
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if ($metadata['thumbnail_url'][0] == '/') {
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$thumbnail_url_parsed = parse_url($metadata['thumbnail_url']);
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$metadata['thumbnail_url'] = "{$thumbnail_url_parsed['scheme']}://{$thumbnail_url_parsed['host']}{$metadata['url']}";
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}
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// Some wordpress opengraph implementations sometimes return a white blank image
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// no need for us to save that!
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if ($metadata['thumbnail_url'] == 'https://s0.wp.com/i/blank.jpg') {
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$metadata['thumbnail_url'] = null;
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}
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}
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return $metadata;
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}
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/**
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* @param string $url
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*
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* @return bool true if allowed by the lists, false otherwise
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*/
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private function allowedLink(string $url): bool
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{
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return true;
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if ($this->check_whitelist ?? false) {
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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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return false;
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}
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/**
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* Private helper that:
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* - checks if given URL is valid and is in fact an image (basic test), returns null if not;
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* - checks if respects file quota and whitelist/blacklist, returns false if not;
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* - downloads the thumbnail, returns a string if successful.
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*
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* @param string $url URL to the remote thumbnail
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*
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* @return null|bool|string
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*/
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private function downloadThumbnail(string $url): bool|string|null
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{
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// Is this a valid URL?
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if (!Common::isValidHttpUrl($url)) {
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Log::debug("Invalid URL ({$url}) in Embed->downloadThumbnail.");
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return null;
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}
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// Is this URL trusted?
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if (!$this->allowedLink($url)) {
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Log::info("Blocked URL ({$url}) in Embed->downloadThumbnail.");
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return false;
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}
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// Validate if the URL really does point to a remote image
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$head = HTTPClient::head($url);
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$headers = $head->getHeaders();
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$headers = array_change_key_case($headers, CASE_LOWER);
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if (empty($headers['content-type']) || GSFile::mimetypeMajor($headers['content-type'][0]) !== 'image') {
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Log::debug("URL ({$url}) doesn't point to an image (content-type: " . (!empty($headers['content-type'][0]) ? $headers['content-type'][0] : 'not available') . ') in Embed->downloadThumbnail.');
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return null;
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}
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// Does it respect the file quota?
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$file_size = $headers['content-length'][0];
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$max_size = Common::config('attachments', 'file_quota');
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if ($file_size > $max_size) {
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Log::debug("Went to download remote thumbnail of size {$file_size} but the upload limit is {$max_size} so we aborted in Embed->downloadThumbnail.");
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return false;
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}
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// Download and return the file
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Log::debug("Downloading remote thumbnail from URL: {$url} in Embed->downloadThumbnail.");
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return HTTPClient::get($url)->getContent();
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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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*
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* @throws ServerException
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*
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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[] = [
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'name' => 'Embed',
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'version' => $this->version(),
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'author' => 'Mikael Nordfeldth, Hugo Sales, Diogo Peralta Cordeiro',
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'homepage' => GNUSOCIAL_PROJECT_URL,
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'description' => // TRANS: Plugin description.
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_m('Plugin for using and representing oEmbed, OpenGraph and other data.'),
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];
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return Event::next;
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}
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}
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