375 lines
13 KiB
PHP
375 lines
13 KiB
PHP
<?php
|
|
|
|
// {{{ 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/>.
|
|
// }}}
|
|
|
|
/**
|
|
* OEmbed and OpenGraph implementation for GNU social
|
|
*
|
|
* @package GNUsocial
|
|
*
|
|
* @author Mikael Nordfeldth
|
|
* @author Stephen Paul Weber
|
|
* @author hannes
|
|
* @author Mikael Nordfeldth
|
|
* @author Miguel Dantas
|
|
* @author Hugo Sales <hugo@hsal.es>
|
|
* @author Diogo Peralta Cordeiro <mail@diogo.site>
|
|
* @copyright 2014-2021 Free Software Foundation, Inc http://www.fsf.org
|
|
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
|
|
*/
|
|
|
|
namespace Plugin\Embed;
|
|
|
|
use App\Core\Cache;
|
|
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\Core\Router\RouteLoader;
|
|
use App\Core\Router\Router;
|
|
use App\Entity\Attachment;
|
|
use App\Entity\Note;
|
|
use App\Entity\RemoteURL;
|
|
use App\Util\Common;
|
|
use App\Util\Exception\DuplicateFoundException;
|
|
use App\Util\Exception\NotFoundException;
|
|
use App\Util\Exception\ServerException;
|
|
use App\Util\Formatting;
|
|
use App\Util\TemporaryFile;
|
|
use Embed\Embed as LibEmbed;
|
|
use Exception;
|
|
use Symfony\Component\HttpFoundation\Request;
|
|
|
|
/**
|
|
* Base class for the Embed plugin that does most of the heavy lifting to get
|
|
* and display representations for remote content.
|
|
*
|
|
* @copyright 2014-2021 Free Software Foundation, Inc http://www.fsf.org
|
|
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
|
|
*/
|
|
class Embed 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 array $domain_whitelist = [
|
|
// hostname => service provider
|
|
'.*' => '', // Default to allowing any host
|
|
];
|
|
|
|
/**
|
|
* This code executes when GNU social creates the page routing, and we hook
|
|
* on this event to add our action handler for Embed.
|
|
*
|
|
* @param $m RouteLoader the router that was initialized.
|
|
*
|
|
* @throws Exception
|
|
*
|
|
* @return bool
|
|
*
|
|
*
|
|
*/
|
|
public function onAddRoute(RouteLoader $m): bool
|
|
{
|
|
$m->connect('oembed', 'main/oembed', Controller\Embed::class);
|
|
$m->connect('embed', 'main/embed', Controller\Embed::class);
|
|
return Event::next;
|
|
}
|
|
|
|
/**
|
|
* Insert oembed and opengraph tags in all HTML head elements
|
|
*/
|
|
public function onShowHeadElements(Request $request, array &$result): bool
|
|
{
|
|
$matches = [];
|
|
preg_match(',/?([^/]+)/?(.*),', $request->getPathInfo(), $matches);
|
|
$url = match ($matches[1]) {
|
|
'attachment' => "{$matches[1]}/{$matches[2]}",
|
|
default => null,
|
|
};
|
|
|
|
if (is_null($url)) {
|
|
foreach (['xml', 'json'] as $format) {
|
|
$result[] = [
|
|
'link' => [
|
|
'rel' => 'alternate',
|
|
'type' => "application/{$format}+oembed",
|
|
'href' => Router::url('embed', ['format' => $format, 'url' => $url]),
|
|
'title' => 'oEmbed',
|
|
], ];
|
|
}
|
|
}
|
|
return Event::next;
|
|
}
|
|
|
|
/**
|
|
* Show this attachment enhanced with the corresponding Embed data, if available
|
|
*
|
|
* @param array $vars
|
|
* @param array $res
|
|
*
|
|
* @return bool
|
|
*/
|
|
public function onViewRemoteUrl(array $vars, array &$res): bool
|
|
{
|
|
$remote_url = $vars['remote_url'];
|
|
try {
|
|
$embed = Cache::get('attachment-embed-' . $remote_url->getId(),
|
|
fn () => DB::findOneBy('attachment_embed', ['remoteurl_id' => $remote_url->getId()]));
|
|
} catch (DuplicateFoundException $e) {
|
|
Log::warning($e);
|
|
return Event::next;
|
|
} catch (NotFoundException) {
|
|
Log::debug("Embed doesn\\'t have a representation for the remote_url id={$remote_url->getId()}. Must have been stored before the plugin was enabled.");
|
|
return Event::next;
|
|
}
|
|
|
|
$attributes = $embed->getImageHTMLAttributes(['class' => 'u-photo embed']);
|
|
|
|
$res[] = Formatting::twigRenderFile('embed/embedView.html.twig',
|
|
['embed' => $embed, 'attributes' => $attributes, 'remote_url' => $remote_url]);
|
|
|
|
return Event::stop;
|
|
}
|
|
|
|
/**
|
|
* Save embedding information for an Attachment, if applicable.
|
|
*
|
|
* @param RemoteURL $remote_url
|
|
* @param Note $note
|
|
*
|
|
* @throws DuplicateFoundException
|
|
*
|
|
* @return bool
|
|
*/
|
|
public function onNewRemoteURLFromNote(RemoteURL $remote_url, Note $note): bool
|
|
{
|
|
// Only handle text mime
|
|
$mimetype = $remote_url->getMimetype();
|
|
if (!(Formatting::startsWith($mimetype, 'text/html') || Formatting::startsWith($mimetype, 'application/xhtml+xml'))) {
|
|
return Event::next;
|
|
}
|
|
|
|
// Ignore if already handled
|
|
$attachment_embed = DB::find('attachment_embed', ['remoteurl_id' => $remote_url->getId()]);
|
|
if (!is_null($attachment_embed)) {
|
|
return Event::next;
|
|
}
|
|
|
|
// If an attachment already exist, do not create an Embed for it. Some other plugin must have done things
|
|
$remote_url_to_attachment = DB::find('remoteurl_to_attachment', ['remoteurl_id' => $remote_url->getId()]);
|
|
if (!is_null($remote_url_to_attachment)) {
|
|
$attachment_id = $remote_url_to_attachment->getAttachmentId();
|
|
try {
|
|
$attachment = DB::findOneBy('attachment', ['id' => $attachment_id]);
|
|
$attachment->livesIncrementAndGet();
|
|
return Event::next;
|
|
} catch (DuplicateFoundException | NotFoundException $e) {
|
|
Log::error($e);
|
|
}
|
|
}
|
|
|
|
// Create an Embed representation for this URL
|
|
$embed_data = $this->getEmbedLibMetadata($remote_url->getRemoteUrl());
|
|
$embed_data['remoteurl_id'] = $remote_url->getId();
|
|
$img_data = $this->downloadThumbnail($embed_data['thumbnail_url']);
|
|
switch ($img_data) {
|
|
case null: // URL isn't usable
|
|
$embed_data['thumbnail_url'] = null;
|
|
// no break
|
|
case false: // Thumbnail isn't acceptable
|
|
DB::persist($attachment = Attachment::create(['mimetype' => $remote_url->getMimetype()]));
|
|
Event::handle('AttachmentStoreNew', [&$attachment]);
|
|
break;
|
|
default: // String is valid image data
|
|
$temp_file = new TemporaryFile();
|
|
$temp_file->write($img_data);
|
|
$attachment = GSFile::sanitizeAndStoreFileAsAttachment($temp_file);
|
|
$embed_data['attachment_id'] = $attachment->getId();
|
|
}
|
|
$embed_data['attachment_id'] = $attachment->getId();
|
|
DB::persist(Entity\AttachmentEmbed::create($embed_data));
|
|
DB::flush();
|
|
return Event::stop;
|
|
}
|
|
|
|
/**
|
|
* Perform an oEmbed or OpenGraph lookup for the given $url.
|
|
*
|
|
* Some known hosts are whitelisted with API endpoints where we
|
|
* know they exist but autodiscovery data isn't available.
|
|
*
|
|
* Throws exceptions on failure.
|
|
*
|
|
* @param string $url
|
|
*
|
|
* @return array
|
|
*/
|
|
private function getEmbedLibMetadata(string $url): array
|
|
{
|
|
Log::info("Trying to find Embed data for {$url} with 'oscarotero/Embed'");
|
|
$embed = new LibEmbed();
|
|
$info = $embed->get($url);
|
|
$metadata['title'] = $info->title;
|
|
$metadata['description'] = $info->description;
|
|
$metadata['author_name'] = $info->authorName;
|
|
$metadata['author_url'] = (string) $info->authorUrl;
|
|
$metadata['provider_name'] = $info->providerName;
|
|
$metadata['provider_url'] = (string) $info->providerUrl;
|
|
|
|
if (!is_null($info->image)) {
|
|
$thumbnail_url = (string) $info->image;
|
|
} else {
|
|
$thumbnail_url = (string) $info->favicon;
|
|
}
|
|
|
|
// Check thumbnail URL validity
|
|
$metadata['thumbnail_url'] = $thumbnail_url;
|
|
|
|
return self::normalizeEmbedLibMetadata($metadata);
|
|
}
|
|
|
|
/**
|
|
* Normalize fetched info.
|
|
*
|
|
* @param array $metadata
|
|
*
|
|
* @return array
|
|
*/
|
|
private static function normalizeEmbedLibMetadata(array $metadata): array
|
|
{
|
|
if (isset($metadata['thumbnail_url'])) {
|
|
// sometimes sites serve the path, not the full URL, for images
|
|
// let's "be liberal in what you accept from others"!
|
|
// add protocol and host if the thumbnail_url starts with /
|
|
if ($metadata['thumbnail_url'][0] == '/') {
|
|
$thumbnail_url_parsed = parse_url($metadata['thumbnail_url']);
|
|
$metadata['thumbnail_url'] = "{$thumbnail_url_parsed['scheme']}://{$thumbnail_url_parsed['host']}{$metadata['url']}";
|
|
}
|
|
|
|
// Some wordpress opengraph implementations sometimes return a white blank image
|
|
// no need for us to save that!
|
|
if ($metadata['thumbnail_url'] == 'https://s0.wp.com/i/blank.jpg') {
|
|
$metadata['thumbnail_url'] = null;
|
|
}
|
|
}
|
|
|
|
return $metadata;
|
|
}
|
|
|
|
/**
|
|
* @param string $url
|
|
*
|
|
* @return bool true if allowed by the lists, false otherwise
|
|
*/
|
|
private function allowedRemoteUrl(string $url): bool
|
|
{
|
|
return true;
|
|
if ($this->check_whitelist ?? false) {
|
|
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
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Private helper that:
|
|
* - checks if given URL is valid and is in fact an image (basic test), returns null if not;
|
|
* - checks if respects file quota and whitelist/blacklist, returns false if not;
|
|
* - downloads the thumbnail, returns a string if successful.
|
|
*
|
|
* @param string $remote_url URL to the remote thumbnail
|
|
*
|
|
* @return null|bool|string
|
|
*/
|
|
private function downloadThumbnail(string $remote_url): bool|string|null
|
|
{
|
|
// Is this a valid URL?
|
|
if (!Common::isValidHttpUrl($remote_url)) {
|
|
Log::debug("Invalid URL ({$remote_url}) in Embed->downloadThumbnail.");
|
|
return null;
|
|
}
|
|
|
|
// Is this URL trusted?
|
|
if (!$this->allowedRemoteUrl($remote_url)) {
|
|
Log::info("Blocked URL ({$remote_url}) in Embed->downloadThumbnail.");
|
|
return false;
|
|
}
|
|
|
|
// Validate if the URL really does point to a remote image
|
|
$head = HTTPClient::head($remote_url);
|
|
$headers = $head->getHeaders();
|
|
$headers = array_change_key_case($headers, CASE_LOWER);
|
|
if (empty($headers['content-type']) || GSFile::mimetypeMajor($headers['content-type'][0]) !== 'image') {
|
|
Log::debug("URL ({$remote_url}) doesn't point to an image (content-type: " . (!empty($headers['content-type'][0]) ? $headers['content-type'][0] : 'not available') . ') in Embed->downloadThumbnail.');
|
|
return null;
|
|
}
|
|
|
|
// Does it respect the file quota?
|
|
$file_size = $headers['content-length'][0];
|
|
$max_size = Common::config('attachments', 'file_quota');
|
|
if ($file_size > $max_size) {
|
|
Log::debug("Went to download remote thumbnail of size {$file_size} but the upload limit is {$max_size} so we aborted in Embed->downloadThumbnail.");
|
|
return false;
|
|
}
|
|
|
|
// Download and return the file
|
|
Log::debug("Downloading remote thumbnail from URL: {$remote_url} in Embed->downloadThumbnail.");
|
|
return HTTPClient::get($remote_url)->getContent();
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*
|
|
* @throws ServerException
|
|
*
|
|
* @return bool true hook value
|
|
*/
|
|
public function onPluginVersion(array &$versions): bool
|
|
{
|
|
$versions[] = [
|
|
'name' => 'Embed',
|
|
'version' => $this->version(),
|
|
'author' => 'Mikael Nordfeldth, Hugo Sales, Diogo Peralta Cordeiro',
|
|
'homepage' => GNUSOCIAL_PROJECT_URL,
|
|
'description' => // TRANS: Plugin description.
|
|
_m('Plugin for using and representing oEmbed, OpenGraph and other data.'),
|
|
];
|
|
return Event::next;
|
|
}
|
|
}
|