69 lines
2.6 KiB
PHP
69 lines
2.6 KiB
PHP
<?php
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if (!defined('GNUSOCIAL')) { exit(1); }
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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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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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];
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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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static function ogFromHtml(DOMDocument $dom) {
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$obj = new stdClass();
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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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