forked from GNUsocial/gnu-social
100 lines
3.9 KiB
PHP
100 lines
3.9 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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* OembedPlugin implementation for GNU social
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*
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* @package GNUsocial
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* @author Mikael Nordfeldth
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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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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* Utility class to get OpenGraph data from HTML DOMs etc.
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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 OpenGraphHelper
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{
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const KEY_REGEX = '/^og\:(\w+(?:\:\w+)?)/';
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protected static $property_map = [
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'site_name' => 'provider_name',
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'title' => 'title',
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'description' => 'html',
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'type' => 'type',
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'url' => 'url',
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'image' => 'thumbnail_url',
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'image:height' => 'thumbnail_height',
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'image:width' => 'thumbnail_width',
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];
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// This regex map has: /pattern(match)/ => matchindex | string
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protected static $type_regex_map = [
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'/^(video)/' => 1,
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'/^image/' => 'photo',
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];
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public static function ogFromHtml(DOMDocument $dom)
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{
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$obj = new stdClass();
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$obj->version = '1.0'; // fake it til u make it
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$nodes = $dom->getElementsByTagName('meta');
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for ($i = 0; $i < $nodes->length; $i++) {
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$node = $nodes->item($i);
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if (!$node->hasAttributes()) {
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continue;
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}
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$property = $node->attributes->getNamedItem('property');
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$matches = array();
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if ($property === null || !preg_match(self::KEY_REGEX, $property->value, $matches)) {
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// not property="og:something"
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continue;
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}
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if (!isset(self::$property_map[$matches[1]])) {
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// unknown metadata property, nothing we would care about anyway
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continue;
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}
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$prop = self::$property_map[$matches[1]];
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$obj->{$prop} = $node->attributes->getNamedItem('content')->value;
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// I don't care right now if they're empty
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}
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if (isset($obj->type)) {
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// Loop through each known OpenGraph type where we have a match in oEmbed
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foreach (self::$type_regex_map as $pattern=>$replacement) {
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$matches = array();
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if (preg_match($pattern, $obj->type, $matches)) {
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$obj->type = is_int($replacement)
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? $matches[$replacement]
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: $replacement;
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break;
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}
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}
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// If it's not known to our type map, we just pass it through in hopes of it getting handled anyway
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} elseif (isset($obj->url)) {
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// If no type is set but we have a URL, let's set type=link
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$obj->type = 'link';
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}
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return $obj;
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}
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}
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