450 lines
19 KiB
PHP
450 lines
19 KiB
PHP
<?php
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if (!defined('GNUSOCIAL')) { exit(1); }
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class OembedPlugin extends Plugin
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{
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// settings which can be set in config.php with addPlugin('Oembed', 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 $domain_whitelist = array( // hostname => service provider
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'^i\d*\.ytimg\.com$' => '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 $imgData = array();
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// these should be declared protected everywhere
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public function initialize()
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{
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parent::initialize();
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$this->domain_whitelist = array_merge($this->domain_whitelist, $this->append_whitelist);
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}
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public function onCheckSchema()
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{
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$schema = Schema::get();
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$schema->ensureTable('file_oembed', File_oembed::schemaDef());
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return true;
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}
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public function onRouterInitialized(URLMapper $m)
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{
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$m->connect('main/oembed', array('action' => 'oembed'));
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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 $e) {
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common_log(LOG_INFO, 'Could not find an oEmbed endpoint using link headers, trying OpenGraph from HTML.');
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// Just ignore it!
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$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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}
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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('attachment',
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array('attachment' => $action->attachment->getID())))),
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'title'=>'oEmbed'),null);
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$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('attachment',
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array('attachment' => $action->attachment->getID())))),
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'title'=>'oEmbed'),null);
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break;
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case 'shownotice':
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if (!$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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'title'=>'oEmbed'),null);
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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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'title'=>'oEmbed'),null);
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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 $action) {
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$action->cssLink($this->path('css/oembed.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_oembed::getKV('file_id', $file->getID());
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if ($fo instanceof File_oembed) {
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common_log(LOG_WARNING, "Strangely, a File_oembed 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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$oembed_data = File_oembed::_getOembed($file->url);
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if ($oembed_data === false) {
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throw new Exception('Did not get oEmbed data from URL');
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}
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} catch (Exception $e) {
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return true;
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}
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File_oembed::saveNew($oembed_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 $file)
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{
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$oembed = File_oembed::getKV('file_id', $file->getID());
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if (empty($oembed->author_name) && empty($oembed->provider)) {
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return true;
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}
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$out->elementStart('div', array('id'=>'oembed_info', 'class'=>'e-content'));
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if (!empty($oembed->author_name)) {
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$out->elementStart('div', 'fn vcard author');
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if (empty($oembed->author_url)) {
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$out->text($oembed->author_name);
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} else {
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$out->element('a', array('href' => $oembed->author_url,
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'class' => 'url'),
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$oembed->author_name);
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}
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}
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if (!empty($oembed->provider)) {
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$out->elementStart('div', 'fn vcard');
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if (empty($oembed->provider_url)) {
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$out->text($oembed->provider);
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} else {
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$out->element('a', array('href' => $oembed->provider_url,
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'class' => 'url'),
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$oembed->provider);
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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 oEmbed info, we'll consider it golden.
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$oembed = File_oembed::getKV('file_id', $file->getID());
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if (!$oembed instanceof File_oembed || !in_array($oembed->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 $key) {
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if (isset($oembed->{$key}) && !empty($oembed->{$key})) {
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$enclosure->{$key} = $oembed->{$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 $file)
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{
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try {
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$oembed = File_oembed::getByFile($file);
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} catch (NoResultException $e) {
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return true;
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}
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// Show thumbnail as usual if it's a photo.
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if ($oembed->type === 'photo') {
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return true;
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}
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$out->elementStart('article', ['class'=>'h-entry oembed']);
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$out->elementStart('header');
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try {
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$thumb = $file->getThumbnail(128, 128);
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$out->element('img', $thumb->getHtmlAttrs(['class'=>'u-photo oembed']));
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unset($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 oembed']);
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$out->element('a', ['class'=>'u-url', 'href'=>$file->getUrl()], common_strip_html($oembed->title));
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$out->elementEnd('h5');
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$out->elementStart('div', ['class'=>'p-author oembed']);
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if (!empty($oembed->author_name)) {
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// TRANS: text before the author name of oEmbed 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($oembed->author_url)) {
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$attrs['href'] = $oembed->author_url;
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$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, $oembed->author_name);
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}
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if (!empty($oembed->provider)) {
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// TRANS: text between the oEmbed 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($oembed->provider_url)) {
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$attrs['href'] = $oembed->provider_url;
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$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, $oembed->provider);
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}
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$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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$out->raw(common_purify($oembed->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 $file)
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{
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try {
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$oembed = File_oembed::getByFile($file);
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} catch (NoResultException $e) {
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return true;
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}
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// the 'photo' type is shown through ordinary means, using StartShowAttachmentRepresentation!
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switch ($oembed->type) {
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case 'video':
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case 'link':
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if (!empty($oembed->html)
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&& (GNUsocial::isAjax() || common_config('attachments', 'show_html'))) {
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require_once INSTALLDIR.'/extlib/HTMLPurifier/HTMLPurifier.auto.php';
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$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($oembed->html));
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}
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return false;
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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 onCreateFileImageThumbnailSource(File $file, &$imgPath, $media=null)
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{
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// If we are on a private node, we won't do any remote calls (just as a precaution until
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// we can configure this from config.php for the private nodes)
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if (common_config('site', 'private')) {
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return true;
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}
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// All our remote Oembed images lack a local filename property in the File object
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if (!is_null($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 oEmbed data, there should be an entry in the File_oembed
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// and File_thumbnail tables respectively. If not, we're not going to do anything.
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$file_oembed = File_oembed::getByFile($file);
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$thumbnail = File_thumbnail::byFile($file);
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} catch (NoResultException $e) {
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// Not Oembed data, or at least nothing we either can or want to use.
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return true;
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}
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try {
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$this->storeRemoteFileThumbnail($thumbnail);
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} catch (AlreadyFulfilledException $e) {
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// aw yiss!
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}
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$imgPath = $thumbnail->getPath();
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return false;
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}
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/**
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* @return boolean false on no check made, provider name on success
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* @throws ServerException if check is made but fails
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*/
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protected function checkWhitelist($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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protected function storeRemoteFileThumbnail(File_thumbnail $thumbnail)
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{
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if (!empty($thumbnail->filename) && file_exists($thumbnail->getPath())) {
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throw new AlreadyFulfilledException(sprintf('A thumbnail seems to already exist for remote file with id==%u', $thumbnail->getFileId()));
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}
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$remoteUrl = $thumbnail->getUrl();
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$this->checkWhitelist($remoteUrl);
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$http = new HTTPClient();
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// First see if it's too large for us
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common_debug(__METHOD__ . ': '.sprintf('Performing HEAD request for remote file id==%u to avoid unnecessarily downloading too large files. URL: %s', $thumbnail->getFileId(), $remoteUrl));
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$head = $http->head($remoteUrl);
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$remoteUrl = $head->getEffectiveUrl(); // to avoid going through redirects again
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$headers = $head->getHeader();
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$filesize = isset($headers['content-length']) ? $headers['content-length'] : null;
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// FIXME: I just copied some checks from StoreRemoteMedia, maybe we should have other checks for thumbnails? Or at least embed into some class somewhere.
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if (empty($filesize)) {
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// file size not specified on remote server
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common_debug(sprintf('%s: Ignoring remote thumbnail because we did not get a content length for thumbnail for file id==%u', __CLASS__, $thumbnail->getFileId()));
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return true;
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} elseif ($filesize > common_config('attachments', 'file_quota')) {
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// file too big according to site configuration
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common_debug(sprintf('%s: Skip downloading remote thumbnail because content length (%u) is larger than file_quota (%u) for file id==%u', __CLASS__, intval($filesize), common_config('attachments', 'file_quota'), $thumbnail->getFileId()));
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return true;
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}
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// Then we download the file to memory and test whether it's actually an image file
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// FIXME: To support remote video/whatever files, this needs reworking.
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common_debug(sprintf('Downloading remote thumbnail for file id==%u (should be size %u) with effective URL: %s', $thumbnail->getFileId(), $filesize, _ve($remoteUrl)));
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$imgData = HTTPClient::quickGet($remoteUrl);
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$info = @getimagesizefromstring($imgData);
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if ($info === false) {
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throw new UnsupportedMediaException(_('Remote file format was not identified as an image.'), $url);
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} elseif (!$info[0] || !$info[1]) {
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throw new UnsupportedMediaException(_('Image file had impossible geometry (0 width or height)'));
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}
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$ext = File::guessMimeExtension($info['mime']);
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// We'll trust sha256 (File::FILEHASH_ALG) not to have collision issues any time soon :)
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$filename = 'oembed-'.hash(File::FILEHASH_ALG, $imgData) . ".{$ext}";
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$fullpath = File_thumbnail::path($filename);
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// Write the file to disk. Throw Exception on failure
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if (!file_exists($fullpath) && file_put_contents($fullpath, $imgData) === false) {
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throw new ServerException(_('Could not write downloaded file to disk.'));
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}
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// Get rid of the file from memory
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unset($imgData);
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// Updated our database for the file record
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$orig = clone($thumbnail);
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$thumbnail->filename = $filename;
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$thumbnail->width = $info[0]; // array indexes documented on php.net:
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$thumbnail->height = $info[1]; // https://php.net/manual/en/function.getimagesize.php
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// Throws exception on failure.
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$thumbnail->updateWithKeys($orig);
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}
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public function onPluginVersion(array &$versions)
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{
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$versions[] = array('name' => 'Oembed',
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'version' => GNUSOCIAL_VERSION,
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'author' => 'Mikael Nordfeldth',
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'homepage' => 'http://gnu.io/',
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'description' =>
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// TRANS: Plugin description.
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_m('Plugin for using and representing Oembed data.'));
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return true;
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}
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}
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