485 lines
18 KiB
PHP
485 lines
18 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 Diogo Peralta Cordeiro <mail@diogo.site>
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* @authir Hugo Sales <hugo@hsal.es>
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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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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 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\Core\Security;
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use App\Entity\Attachment;
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use App\Entity\AttachmentThumbnail;
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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\TemporaryFile;
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use Embed\Embed as LibEmbed;
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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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/**
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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 $domain_allowlist = [
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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 URLMapper the router that was initialized.
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*
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* @throws Exception
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*
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* @return void true if successful, the exception object if it isn't.
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*/
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public function onAddRoute(RouteLoader $m)
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{
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$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 $result)
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{
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$matches = [];
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preg_match(',/?([^/]+)/?.*,', $request->getPathInfo(), $matches);
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switch ($matches[1]) {
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case 'attachment':
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$url = "{$matches[1]}/{$matches[2]}";
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break;
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}
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if (isset($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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* Save embedding information for an Attachment, if applicable.
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*
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* Normally this event is called through File::saveNew()
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*
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* @param Attachment $attachment The newly inserted Attachment object.
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*
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* @return bool success
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*/
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public function onAttachmentStoreNew(Attachment $attachment)
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{
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try {
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DB::findOneBy('attachment_embed', ['attachment_id' => $attachment->getId()]);
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} catch (NotFoundException) {
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} catch (DuplicateFoundException) {
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Log::warning("Strangely, an attachment_embed object exists for new file {$attachment->getID()}");
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return Event::next;
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}
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if (!is_null($attachment->getRemoteUrl()) || (!is_null($mimetype = $attachment->getMimetype()) && (('text/html' === substr($mimetype, 0, 9) || 'application/xhtml+xml' === substr($mimetype, 0, 21))))) {
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try {
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$embed_data = $this->getEmbed($attachment->getRemoteUrl(), $attachment);
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$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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} catch (Exception $e) {
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Log::warning($e);
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return Event::next;
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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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* Replace enclosure representation of an attachment with the data from embed
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*
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* @param mixed $enclosure
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*/
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public function onFileEnclosureMetadata(Attachment $attachment, &$enclosure)
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{
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// Never treat generic HTML links as an enclosure type!
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// But if we have embed info, we'll consider it golden.
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try {
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$embed = DB::findOneBy('attachment_embed', ['attachment_id' => $attachment->getId()]);
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} catch (NotFoundException) {
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return Event::next;
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}
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foreach (['mimetype', 'url', 'title', 'modified', 'width', 'height'] as $key) {
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if (isset($embed->{$key}) && !empty($embed->{$key})) {
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$enclosure->{$key} = $embed->{$key};
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}
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}
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return true;
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}
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/** Placeholder */
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public function onShowAttachment(Attachment $attachment, array &$res)
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{
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try {
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$embed = Cache::get('attachment-embed-' . $attachment->getId(),
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fn () => DB::findOneBy('attachment_embed', ['attachment_id' => $attachment->getId()]));
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} catch (DuplicateFoundException $e) {
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Log::waring($e);
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return Event::next;
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} catch (NotFoundException) {
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return Event::next;
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}
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if (is_null($embed) && empty($embed->getAuthorName()) && empty($embed->getProvider())) {
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return Event::next;
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}
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$thumbnail = AttachmentThumbnail::getOrCreate(attachment: $attachment, width: $width, height: $height, crop: $smart_crop);
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$attributes = $thumbnail->getHTMLAttributes(['class' => 'u-photo embed']);
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$res[] = Formatting::twigRender(<<<END
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<article class="h-entry embed">
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<header>
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<img class="u-photo embed" width="{{attributes['width']}}" height="{{attributes['height']}}" src="{{attributes['src']}}" />
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<h5 class="p-name embed">
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<a class="u-url" href="{{attachment.getUrl()}}">{{embed.getTitle() | escape}}</a>
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</h5>
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<div class="p-author embed">
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{% if embed.getAuthorName() is not null %}
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<div class="fn vcard author">
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{% if embed.getAuthorUrl() is null %}
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<p>{{embed.getAuthorName()}}</p>
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{% else %}
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<a href="{{embed.getAuthorUrl()}}" class="url">{{embed.getAuthorName()}}</a>
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{% endif %}
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</div>
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{% endif %}
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{% if embed.getProvider() is not null %}
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<div class="fn vcard">
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{% if embed.getProviderUrl() is null %}
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<p>{{embed.getProvider()}}</p>
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{% else %}
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<a href="{{embed.getProviderUrl()}}" class="url">{{embed.getProvider()}}</a>
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{% endif %}
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</div>
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{% endif %}
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</div>
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</header>
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<div class="p-summary embed">
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{{ embed.getHtml() | escape }}
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</div>
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</article>
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END, ['embed' => $embed, 'thumbnail' => $thumbnail, 'attributes' => $attributes]);
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return Event::stop;
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}
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/**
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* @throws ServerException if check is made but fails
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*
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* @return bool false on no check made, provider name on success
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*/
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protected function checkAllowlist(string $url)
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{
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if ($this->check_allowlist ?? 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_allowlist 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(_m('Domain not in remote thumbnail source allowlist: {host}', ['host' => $host]));
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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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* @param string $url
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* @param array $headers - if we already made a request
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*
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* @return bool|string the file size if it succeeds, false otherwise.
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*/
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private function getRemoteFileSize(string $url, ?array $headers = null): ?int
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{
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try {
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if ($headers === null) {
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if (!Common::isValidHttpUrl($url)) {
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Log::error('Invalid URL in Embed::getRemoteFileSize()');
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return false;
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}
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$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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}
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return $headers['content-length'][0] ?? false;
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} catch (Exception $e) {
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Loog::error($e);
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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 HEAD request 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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* @param mixed $url
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* @param null|mixed $headers
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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(string $url, ?array $headers = null): ?int
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{
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try {
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if ($headers === null) {
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if (!Common::isValidHttpUrl($url)) {
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Log::error('Invalid URL in Embed::getRemoteFileSize()');
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return false;
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}
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$head = HTTPClient::head($url);
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$headers = $head->getHeaders();
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$headers = array_change_key_case($headers, CASE_LOWER);
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}
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return !empty($headers['content-type']) && GSFile::mimetypeMajor($headers['content-type'][0]) === 'image';
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} catch (Exception $e) {
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Loog::error($e);
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return false;
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}
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}
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/**
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* Validate that $imgData is a valid image, place it in it's folder and resize
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*
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* @param $imgData - The image data to validate
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* @param null|string $url - The url where the image came from, to fetch metadata
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* @param null|array $headers - The headers possible previous request to $url
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*/
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protected function validateAndWriteImage($imgData, string $url, array $headers): array
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{
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$file = new TemporaryFile();
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$file->write($imgData);
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$mimetype = $headers['content-type'][0];
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Event::handle('AttachmentValidation', [&$file, &$mimetype]);
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Event::handle('HashFile', [$file->getPathname(), &$hash]);
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$filename = Common::config('attachments', 'dir') . "embed/{$hash}";
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$file->commit($filename);
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unset($file);
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if (array_key_exists('content-disposition', $headers) && preg_match('/^.+; filename="(.+?)"$/', $headers['content-disposition'][0], $matches) === 1) {
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$original_name = $matches[1];
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}
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$info = getimagesize($filename);
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$width = $info[0];
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$height = $info[1];
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return [$filename, $width, $height, $original_name ?? null, $mimetype];
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}
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/**
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* Create and store a thumbnail representation of a remote image
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*/
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protected function storeRemoteThumbnail(Attachment $attachment): array | bool
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{
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if ($attachment->haveFilename() && file_exists($attachment->getPath())) {
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throw new AlreadyFulfilledException(_m('A thumbnail seems to already exist for remote file with id=={id}', ['id' => $attachment->getId()]));
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}
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$url = $attachment->getRemoteUrl();
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if (substr($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->checkAllowlist($url);
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$head = HTTPClient::head($url);
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$headers = $head->getHeaders();
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$headers = array_change_key_case($headers, CASE_LOWER);
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try {
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$is_image = $this->isRemoteImage($url, $headers);
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if ($is_image == true) {
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$file_size = $this->getRemoteFileSize($url, $headers);
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$max_size = Common::config('attachments', 'file_quota');
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if (($file_size != false) && ($file_size > $max_size)) {
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throw new \Exception("Wanted to store remote thumbnail of size {$file_size} but the upload limit is {$max_size} so we aborted.");
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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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Log::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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Log::debug('Downloading remote thumbnail for file id==' . $attachment->getId() . " with thumbnail URL: {$url}");
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try {
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$imgData = HTTPClient::get($url)->getContent();
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if (isset($imgData)) {
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[$filename, $width, $height, $original_name, $mimetype] = $this->validateAndWriteImage($imgData, $url, $headers);
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} else {
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throw new UnsupportedMediaException(_m('HTTPClient returned an empty result'));
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}
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} catch (UnsupportedMediaException $e) {
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// Couldn't find anything that looks like an image, nothing to do
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Log::debug($e);
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return false;
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}
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}
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DB::persist(AttachmentThumbnail::create(['attachment_id' => $attachment->getId(), 'width' => $width, 'height' => $height]));
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$attachment->setFilename($filename);
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DB::flush();
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return [$filename, $width, $height, $original_name, $mimetype];
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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 allowlisted 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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* @throws EmbedHelper_BadHtmlException
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* @throws HTTP_Request2_Exception
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*
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* @return object
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*/
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public function getEmbed(string $url, Attachment $attachment): array
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{
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Log::info('Checking for remote URL metadata for ' . $url);
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try {
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Log::info("Trying to find Embed data for {$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['html'] = Security::sanitize($info->description);
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$metadata['url'] = $info->url;
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$metadata['author_name'] = $info->authorName;
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$metadata['author_url'] = $info->authorUrl;
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$metadata['provider_name'] = $info->providerName;
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$metadata['provider_url'] = $info->providerUrl;
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if (!is_null($info->image)) {
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if (substr($info->image, 0, 4) === 'data') {
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// Inline image
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$imgData = base64_decode(substr($info->image, stripos($info->image, 'base64,') + 7));
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[$filename, $width, $height, $original_name, $mimetype] = $this->validateAndWriteImage($imgData);
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} else {
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$attachment->setRemoteUrl((string) $info->image);
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[$filename, $width, $height, $original_name, $mimetype] = $this->storeRemoteThumbnail($attachment);
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}
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$metadata['width'] = $height;
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$metadata['height'] = $width;
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$metadata['mimetype'] = $mimetype;
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}
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} catch (Exception $e) {
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Log::info("Failed to find Embed data for {$url} with 'oscarotero/Embed', got exception: " . get_class($e));
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}
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$metadata = self::normalize($metadata);
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$attachment->setTitle($metadata['title']);
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return $metadata;
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}
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/**
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* Normalize fetched info.
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*/
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public static function normalize(array $data): array
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{
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if (isset($metadata['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 ($metadata['url'][0] == '/') {
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$thumbnail_url_parsed = parse_url($metadata['url']);
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$metadata['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['url'] == 'https://s0.wp.com/i/blank.jpg') {
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$metadata['url'] = null;
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}
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if (!isset($data['width'])) {
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$data['width'] = Common::config('thumbnail', 'width');
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$data['height'] = Common::config('thumbnail', 'height');
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}
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}
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return $data;
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}
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}
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