651 lines
26 KiB
PHP
651 lines
26 KiB
PHP
<?php
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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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* OEmbed and OpenGraph implementation for GNU social
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*
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* @package GNUsocial
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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 Diogo Cordeiro <diogo@fc.up.pt>
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* @author Miguel Dantas <biodantasgs@gmail.com>
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* @copyright 2019 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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defined('GNUSOCIAL') || die();
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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 2019 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 EmbedPlugin extends Plugin
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{
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const PLUGIN_VERSION = '0.1.0';
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// settings which can be set in config.php with addPlugin('Embed', array('param'=>'value', ...));
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// WARNING, these are _regexps_ (slashes added later). Always escape your dots and end ('$') your strings
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public $domain_whitelist = [
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// hostname => service provider
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'^i\d*\.ytimg\.com$' => 'YouTube',
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'^i\d*\.vimeocdn\.com$' => 'Vimeo',
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];
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public $append_whitelist = array(); // fill this array as domain_whitelist to add more trusted sources
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public $check_whitelist = false; // security/abuse precaution
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protected $imgData = array();
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/**
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* Initialize the Embed plugin and set up the environment it needs for it.
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* Returns true if it initialized properly, the exception object if it
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* doesn't.
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*/
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public function initialize()
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{
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parent::initialize();
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$this->domain_whitelist = array_merge($this->domain_whitelist, $this->append_whitelist);
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}
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/**
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* The code executed on GNU social checking the database schema, which in
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* this case is to make sure we have the plugin table we need.
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*
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* @return bool true if it ran successfully, the exception object if it doesn't.
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*/
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public function onCheckSchema()
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{
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$this->onEndUpgrade(); // Ensure rename
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$schema = Schema::get();
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$schema->ensureTable('file_embed', File_embed::schemaDef());
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return true;
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}
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public function onEndUpgrade()
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{
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$schema = Schema::get();
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return $schema->renameTable('file_oembed', 'file_embed');
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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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* @return bool true if successful, the exception object if it isn't.
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*/
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public function onRouterInitialized(URLMapper $m)
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{
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$m->connect('main/embed', ['action' => 'embed']);
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}
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/**
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* This event executes when GNU social encounters a remote URL we then decide
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* to interrogate for metadata. Embed gloms onto it to see if we have an
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* oEmbed endpoint or image to try to represent in the post.
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*
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* @param $url string the remote URL we're looking at
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* @param $dom DOMDocument the document we're getting metadata from
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* @param $metadata stdClass class representing the metadata
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* @return bool true if successful, the exception object if it isn't.
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*/
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public function onGetRemoteUrlMetadataFromDom($url, DOMDocument $dom, stdClass &$metadata)
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{
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try {
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common_log(LOG_INFO, 'Trying to discover an oEmbed endpoint using link headers.');
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$api = oEmbedHelper::oEmbedEndpointFromHTML($dom);
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common_log(LOG_INFO, 'Found oEmbed API endpoint ' . $api . ' for URL ' . $url);
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$params = array(
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'maxwidth' => common_config('thumbnail', 'width'),
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'maxheight' => common_config('thumbnail', 'height'),
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);
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$metadata = oEmbedHelper::getOembedFrom($api, $url, $params);
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// Facebook just gives us javascript in its oembed html,
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// so use the content of the title element instead
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if (strpos($url, 'https://www.facebook.com/') === 0) {
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$metadata->html = @$dom->getElementsByTagName('title')->item(0)->nodeValue;
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}
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// Wordpress sometimes also just gives us javascript, use og:description if it is available
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$xpath = new DomXpath($dom);
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$generatorNode = @$xpath->query('//meta[@name="generator"][1]')->item(0);
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if ($generatorNode instanceof DomElement) {
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// when wordpress only gives us javascript, the html stripped from tags
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// is the same as the title, so this helps us to identify this (common) case
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if (strpos($generatorNode->getAttribute('content'), 'WordPress') === 0
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&& trim(strip_tags($metadata->html)) == trim($metadata->title)) {
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$propertyNode = @$xpath->query('//meta[@property="og:description"][1]')->item(0);
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if ($propertyNode instanceof DomElement) {
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$metadata->html = $propertyNode->getAttribute('content');
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}
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}
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}
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} catch (Exception $e) {
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// FIXME - make sure the error was because we couldn't get metadata, not something else! -mb
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common_log(LOG_INFO, 'Could not find an oEmbed endpoint using link headers, trying OpenGraph from HTML.');
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// Just ignore it!
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$metadata = OpenGraphHelper::ogFromHtml($dom);
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}
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if (isset($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 (substr($metadata->thumbnail_url, 0, 1) == '/') {
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$thumbnail_url_parsed = parse_url($metadata->url);
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$metadata->thumbnail_url = $thumbnail_url_parsed['scheme']."://".$thumbnail_url_parsed['host'].$metadata->thumbnail_url;
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}
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// some wordpress opengraph implementations sometimes return a white blank image
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// no need for us to save that!
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if ($metadata->thumbnail_url == 'https://s0.wp.com/i/blank.jpg') {
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unset($metadata->thumbnail_url);
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}
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// FIXME: this is also true of locally-installed wordpress so we should watch out for that.
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}
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return true;
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}
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public function onEndShowHeadElements(Action $action)
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{
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switch ($action->getActionName()) {
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case 'attachment':
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$action->element('link', array('rel'=>'alternate',
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'type'=>'application/json+oembed',
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'href'=>common_local_url(
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'oembed',
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array(),
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array('format'=>'json', 'url'=>
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common_local_url(
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'attachment',
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array('attachment' => $action->attachment->getID())
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))
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),
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'title'=>'oEmbed'));
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$action->element('link', array('rel'=>'alternate',
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'type'=>'text/xml+oembed',
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'href'=>common_local_url(
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'oembed',
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array(),
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array('format'=>'xml','url'=>
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common_local_url(
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'attachment',
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array('attachment' => $action->attachment->getID())
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))
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),
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'title'=>'oEmbed'));
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break;
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case 'shownotice':
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if (!$action->notice->isLocal()) {
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break;
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}
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try {
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$action->element('link', array('rel'=>'alternate',
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'type'=>'application/json+oembed',
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'href'=>common_local_url(
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'oembed',
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array(),
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array('format'=>'json','url'=>$action->notice->getUrl())
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),
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'title'=>'oEmbed'));
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$action->element('link', array('rel'=>'alternate',
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'type'=>'text/xml+oembed',
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'href'=>common_local_url(
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'oembed',
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array(),
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array('format'=>'xml','url'=>$action->notice->getUrl())
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),
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'title'=>'oEmbed'));
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} catch (InvalidUrlException $e) {
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// The notice is probably a share or similar, which don't
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// have a representational URL of their own.
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}
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break;
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}
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return true;
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}
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public function onEndShowStylesheets(Action $action)
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{
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$action->cssLink($this->path('css/embed.css'));
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return true;
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}
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/**
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* Save embedding information for a File, 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 File $file The newly inserted File object.
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*
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* @return boolean success
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*/
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public function onEndFileSaveNew(File $file)
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{
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$fo = File_embed::getKV('file_id', $file->getID());
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if ($fo instanceof File_embed) {
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common_log(LOG_WARNING, "Strangely, a File_embed object exists for new file {$file->getID()}", __FILE__);
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return true;
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}
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if (isset($file->mimetype)
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&& (('text/html' === substr($file->mimetype, 0, 9)
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|| 'application/xhtml+xml' === substr($file->mimetype, 0, 21)))) {
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try {
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$embed_data = File_embed::_getEmbed($file->url);
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if ($embed_data === false) {
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throw new Exception('Did not get embed data from URL');
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}
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$file->setTitle($embed_data->title);
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} catch (Exception $e) {
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common_log(LOG_WARNING, sprintf(__METHOD__.': %s thrown when getting embed data: %s', get_class($e), _ve($e->getMessage())));
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return true;
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}
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File_embed::saveNew($embed_data, $file->getID());
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}
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return true;
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}
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public function onEndShowAttachmentLink(HTMLOutputter $out, File $file)
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{
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$embed = File_embed::getKV('file_id', $file->getID());
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if (empty($embed->author_name) && empty($embed->provider)) {
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return true;
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}
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$out->elementStart('div', array('id'=>'oembed_info', 'class'=>'e-content'));
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if (!empty($embed->author_name)) {
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$out->elementStart('div', 'fn vcard author');
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if (empty($embed->author_url)) {
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$out->text($embed->author_name);
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} else {
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$out->element(
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'a',
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array('href' => $embed->author_url,
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'class' => 'url'),
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$embed->author_name
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);
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}
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}
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if (!empty($embed->provider)) {
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$out->elementStart('div', 'fn vcard');
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if (empty($embed->provider_url)) {
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$out->text($embed->provider);
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} else {
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$out->element(
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'a',
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array('href' => $embed->provider_url,
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'class' => 'url'),
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$embed->provider
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);
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}
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}
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$out->elementEnd('div');
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}
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public function onFileEnclosureMetadata(File $file, &$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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$embed = File_embed::getKV('file_id', $file->getID());
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if (!$embed instanceof File_embed || !in_array($embed->type, array('photo', 'video'))) {
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return true;
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}
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foreach (array('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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public function onStartShowAttachmentRepresentation(HTMLOutputter $out, File $file)
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{
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try {
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$embed = File_embed::getByFile($file);
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} catch (NoResultException $e) {
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return true;
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}
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// Show thumbnail as usual if it's a photo.
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if ($embed->type === 'photo') {
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return true;
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}
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$out->elementStart('article', ['class'=>'h-entry embed']);
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$out->elementStart('header');
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try {
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$thumb = $file->getThumbnail(128, 128);
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$out->element('img', $thumb->getHtmlAttrs(['class'=>'u-photo embed']));
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unset($thumb);
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} catch (Exception $e) {
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$out->element('div', ['class'=>'error'], $e->getMessage());
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}
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$out->elementStart('h5', ['class'=>'p-name embed']);
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$out->element('a', ['class'=>'u-url', 'href'=>$file->getUrl()], common_strip_html($embed->title));
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$out->elementEnd('h5');
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$out->elementStart('div', ['class'=>'p-author embed']);
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if (!empty($embed->author_name)) {
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// TRANS: text before the author name of embed attachment representation
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// FIXME: The whole "By x from y" should be i18n because of different language constructions.
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$out->text(_('By '));
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$attrs = ['class'=>'h-card p-author'];
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if (!empty($embed->author_url)) {
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$attrs['href'] = $embed->author_url;
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$tag = 'a';
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} else {
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$tag = 'span';
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}
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$out->element($tag, $attrs, $embed->author_name);
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}
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if (!empty($embed->provider)) {
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// TRANS: text between the embed author name and provider url
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// FIXME: The whole "By x from y" should be i18n because of different language constructions.
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$out->text(_(' from '));
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$attrs = ['class'=>'h-card'];
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if (!empty($embed->provider_url)) {
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$attrs['href'] = $embed->provider_url;
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$tag = 'a';
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} else {
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$tag = 'span';
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}
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$out->element($tag, $attrs, $embed->provider);
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}
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$out->elementEnd('div');
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$out->elementEnd('header');
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$out->elementStart('div', ['class'=>'p-summary oembed']);
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$out->raw(common_purify($embed->html));
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$out->elementEnd('div');
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$out->elementStart('footer');
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$out->elementEnd('footer');
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$out->elementEnd('article');
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return false;
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}
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public function onShowUnsupportedAttachmentRepresentation(HTMLOutputter $out, File $file)
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{
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try {
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$embed = File_embed::getByFile($file);
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} catch (NoResultException $e) {
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return true;
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}
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// the 'photo' type is shown through ordinary means, using StartShowAttachmentRepresentation!
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switch ($embed->type) {
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case 'video':
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case 'link':
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if (!empty($embed->html)
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&& (GNUsocial::isAjax() || common_config('attachments', 'show_html'))) {
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require_once INSTALLDIR.'/extlib/HTMLPurifier/HTMLPurifier.auto.php';
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$purifier = new HTMLPurifier();
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// FIXME: do we allow <object> and <embed> here? we did that when we used htmLawed, but I'm not sure anymore...
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$out->raw($purifier->purify($embed->html));
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}
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return false;
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}
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return true;
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}
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/**
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* This event executes when GNU social is creating a file thumbnail entry in
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* the database. We glom onto this to create proper information for Embed
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* object thumbnails.
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*
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* @param $file File the file of the created thumbnail
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* @param &$imgPath string = the path to the created thumbnail
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* @return bool true if it succeeds (including non-action
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* states where it isn't oEmbed data, so it doesn't mess up the event handle
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* for other things hooked into it), or the exception if it fails.
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*/
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public function onCreateFileImageThumbnailSource(File $file, &$imgPath, $media)
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{
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// If we are on a private node, we won't do any remote calls (just as a precaution until
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// we can configure this from config.php for the private nodes)
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if (common_config('site', 'private')) {
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return true;
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}
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// All our remote Embed images lack a local filename property in the File object
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if (!is_null($file->filename)) {
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common_debug(sprintf('Filename of file id==%d is not null (%s), so nothing Embed '.
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'should handle.', $file->getID(), _ve($file->filename)));
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return true;
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}
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try {
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// If we have proper Embed data, there should be an entry in the File_embed
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// and File_thumbnail tables respectively. If not, we're not going to do anything.
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$thumbnail = File_thumbnail::byFile($file);
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} catch (NoResultException $e) {
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// Not Embed data, or at least nothing we either can or want to use.
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common_debug('No Embed data found for file id=='.$file->getID());
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return true;
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}
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try {
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$this->storeRemoteFileThumbnail($thumbnail);
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} catch (AlreadyFulfilledException $e) {
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// aw yiss!
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} catch (Exception $e) {
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common_debug(sprintf('Embed encountered an exception (%s) for file id==%d: %s',
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get_class($e), $file->getID(), _ve($e->getMessage())));
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throw $e;
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}
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// Out
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$imgPath = $thumbnail->getPath();
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return false;
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}
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/**
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* @return bool false on no check made, provider name on success
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* @throws ServerException if check is made but fails
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*/
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protected function checkWhitelist($url)
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{
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if (!$this->check_whitelist) {
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return false; // indicates "no check made"
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}
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$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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throw new ServerException(sprintf(_('Domain not in remote thumbnail source whitelist: %s'), $host));
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}
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/**
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* Check the file size of a remote file using a HEAD request and checking
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* the content-length variable returned. This isn't 100% foolproof but is
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* reliable enough for our purposes.
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*
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* @return string|bool the file size if it succeeds, false otherwise.
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*/
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private function getRemoteFileSize($url)
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{
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try {
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if (empty($url)) {
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return false;
|
|
}
|
|
stream_context_set_default(array('http' => array('method' => 'HEAD')));
|
|
$head = @get_headers($url, 1);
|
|
if (gettype($head)=="array") {
|
|
$head = array_change_key_case($head);
|
|
$size = isset($head['content-length']) ? $head['content-length'] : 0;
|
|
|
|
if (!$size) {
|
|
return false;
|
|
}
|
|
} else {
|
|
return false;
|
|
}
|
|
return $size; // return formatted size
|
|
} 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)
|
|
{
|
|
if (!filter_var($url, FILTER_VALIDATE_URL)) {
|
|
common_log(LOG_ERR, "Invalid URL in Embed::isRemoteImage()");
|
|
return false;
|
|
}
|
|
if ($url==null) {
|
|
common_log(LOG_ERR, "URL not specified in Embed::isRemoteImage()");
|
|
return false;
|
|
}
|
|
try {
|
|
$curl = curl_init($url);
|
|
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
|
|
curl_setopt($curl, CURLOPT_HEADER, true);
|
|
curl_setopt($curl, CURLOPT_NOBODY, true);
|
|
curl_exec($curl);
|
|
$type = curl_getinfo($curl, CURLINFO_CONTENT_TYPE);
|
|
if (strpos($type, 'image') !== false) {
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
} finally {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Function to create and store a thumbnail representation of a remote image
|
|
*
|
|
* @param $thumbnail File_thumbnail object containing the file thumbnail
|
|
* @return bool true if it succeeded, the exception if it fails, or false if it
|
|
* is limited by system limits (ie the file is too large.)
|
|
*/
|
|
protected function storeRemoteFileThumbnail(File_thumbnail $thumbnail)
|
|
{
|
|
if (!empty($thumbnail->filename) && file_exists($thumbnail->getPath())) {
|
|
throw new AlreadyFulfilledException(
|
|
sprintf('A thumbnail seems to already exist for remote file with id==%u', $thumbnail->file_id));
|
|
}
|
|
|
|
$url = $thumbnail->getUrl();
|
|
$this->checkWhitelist($url);
|
|
|
|
try {
|
|
$isImage = $this->isRemoteImage($url);
|
|
if ($isImage==true) {
|
|
$max_size = common_get_preferred_php_upload_limit();
|
|
$file_size = $this->getRemoteFileSize($url);
|
|
if (($file_size!=false) && ($file_size > $max_size)) {
|
|
common_debug("Went to store remote thumbnail of size " . $file_size .
|
|
" but the upload limit is " . $max_size . " so we aborted.");
|
|
return false;
|
|
}
|
|
}
|
|
} catch (Exception $err) {
|
|
common_debug("Could not determine size of remote image, aborted local storage.");
|
|
return $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 thumbnail for file id==%u with thumbnail URL: %s',
|
|
$thumbnail->file_id, $url));
|
|
$imgData = HTTPClient::quickGet($url);
|
|
$info = @getimagesizefromstring($imgData);
|
|
if ($info === false) {
|
|
throw new UnsupportedMediaException(_('Remote file format was not identified as an image.'), $url);
|
|
} elseif (!$info[0] || !$info[1]) {
|
|
throw new UnsupportedMediaException(_('Image file had impossible geometry (0 width or height)'));
|
|
}
|
|
|
|
$ext = File::guessMimeExtension($info['mime']);
|
|
|
|
try {
|
|
// We'll trust sha256 (File::FILEHASH_ALG) not to have collision issues any time soon :)
|
|
$original_filename = bin2hex('embed.' . $ext);
|
|
$filehash = hash(File::FILEHASH_ALG, $imgData);
|
|
$filename = "{$original_filename}-{$filehash}";
|
|
$fullpath = File_thumbnail::path($filename);
|
|
// Write the file to disk. Throw Exception on failure
|
|
if (!file_exists($fullpath) && file_put_contents($fullpath, $imgData) === false) {
|
|
throw new ServerException(_('Could not write downloaded file to disk.'));
|
|
}
|
|
} catch (Exception $err) {
|
|
common_log(LOG_ERROR, "Went to write a thumbnail to disk in EmbedPlugin::storeRemoteThumbnail " .
|
|
"but encountered error: {$err}");
|
|
return $err;
|
|
} finally {
|
|
unset($imgData);
|
|
}
|
|
|
|
try {
|
|
// Updated our database for the file record
|
|
$orig = clone($thumbnail);
|
|
$thumbnail->filename = $filename;
|
|
$thumbnail->width = $info[0]; // array indexes documented on php.net:
|
|
$thumbnail->height = $info[1]; // https://php.net/manual/en/function.getimagesize.php
|
|
// Throws exception on failure.
|
|
$thumbnail->updateWithKeys($orig);
|
|
} catch (exception $err) {
|
|
common_log(LOG_ERROR, "Went to write a thumbnail entry to the database in " .
|
|
"EmbedPlugin::storeRemoteThumbnail but encountered error: ".$err);
|
|
return $err;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
$versions[] = array('name' => 'Embed',
|
|
'version' => self::PLUGIN_VERSION,
|
|
'author' => 'Mikael Nordfeldth',
|
|
'homepage' => 'http://gnu.io/social/',
|
|
'description' =>
|
|
// TRANS: Plugin description.
|
|
_m('Plugin for using and representing oEmbed, OpenGraph and other data.'));
|
|
return true;
|
|
}
|
|
}
|