511 lines
14 KiB
PHP
511 lines
14 KiB
PHP
<?php
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/**
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* @file src/Util/ParseUrl.php
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* @brief Get informations about a given URL
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*/
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namespace Friendica\Util;
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use DOMDocument;
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use DOMXPath;
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use Friendica\Content\OEmbed;
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use Friendica\Core\Addon;
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use Friendica\Core\Logger;
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use Friendica\Database\DBA;
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use Friendica\Object\Image;
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use Friendica\Util\Strings;
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/**
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* @brief Class with methods for extracting certain content from an url
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*/
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class ParseUrl
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{
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/**
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* @brief Search for chached embeddable data of an url otherwise fetch it
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*
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* @param string $url The url of the page which should be scraped
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* @param bool $no_guessing If true the parse doens't search for
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* preview pictures
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* @param bool $do_oembed The false option is used by the function fetch_oembed()
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* to avoid endless loops
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*
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* @return array which contains needed data for embedding
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* string 'url' => The url of the parsed page
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* string 'type' => Content type
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* string 'title' => The title of the content
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* string 'text' => The description for the content
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* string 'image' => A preview image of the content (only available
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* if $no_geuessing = false
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* array'images' = Array of preview pictures
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* string 'keywords' => The tags which belong to the content
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*
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* @see ParseUrl::getSiteinfo() for more information about scraping
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* embeddable content
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*/
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public static function getSiteinfoCached($url, $no_guessing = false, $do_oembed = true)
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{
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if ($url == "") {
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return false;
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}
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$parsed_url = DBA::selectFirst('parsed_url', ['content'],
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['url' => Strings::normaliseLink($url), 'guessing' => !$no_guessing, 'oembed' => $do_oembed]
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);
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if (!empty($parsed_url['content'])) {
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$data = unserialize($parsed_url['content']);
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return $data;
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}
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$data = self::getSiteinfo($url, $no_guessing, $do_oembed);
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DBA::insert(
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'parsed_url',
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[
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'url' => Strings::normaliseLink($url), 'guessing' => !$no_guessing,
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'oembed' => $do_oembed, 'content' => serialize($data),
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'created' => DateTimeFormat::utcNow()
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],
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true
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);
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return $data;
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}
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/**
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* @brief Parse a page for embeddable content information
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*
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* This method parses to url for meta data which can be used to embed
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* the content. If available it prioritizes Open Graph meta tags.
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* If this is not available it uses the twitter cards meta tags.
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* As fallback it uses standard html elements with meta informations
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* like \<title\>Awesome Title\</title\> or
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* \<meta name="description" content="An awesome description"\>
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*
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* @param string $url The url of the page which should be scraped
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* @param bool $no_guessing If true the parse doens't search for
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* preview pictures
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* @param bool $do_oembed The false option is used by the function fetch_oembed()
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* to avoid endless loops
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* @param int $count Internal counter to avoid endless loops
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*
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* @return array which contains needed data for embedding
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* string 'url' => The url of the parsed page
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* string 'type' => Content type
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* string 'title' => The title of the content
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* string 'text' => The description for the content
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* string 'image' => A preview image of the content (only available
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* if $no_geuessing = false
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* array'images' = Array of preview pictures
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* string 'keywords' => The tags which belong to the content
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*
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* @todo https://developers.google.com/+/plugins/snippet/
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* @verbatim
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* <meta itemprop="name" content="Awesome title">
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* <meta itemprop="description" content="An awesome description">
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* <meta itemprop="image" content="http://maple.libertreeproject.org/images/tree-icon.png">
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*
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* <body itemscope itemtype="http://schema.org/Product">
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* <h1 itemprop="name">Shiny Trinket</h1>
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* <img itemprop="image" src="{image-url}" />
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* <p itemprop="description">Shiny trinkets are shiny.</p>
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* </body>
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* @endverbatim
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*/
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public static function getSiteinfo($url, $no_guessing = false, $do_oembed = true, $count = 1)
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{
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$a = \get_app();
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$siteinfo = [];
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// Check if the URL does contain a scheme
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$scheme = parse_url($url, PHP_URL_SCHEME);
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if ($scheme == '') {
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$url = 'http://' . trim($url, '/');
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}
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if ($count > 10) {
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Logger::log('Endless loop detected for ' . $url, Logger::DEBUG);
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return $siteinfo;
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}
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$url = trim($url, "'");
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$url = trim($url, '"');
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$url = Network::stripTrackingQueryParams($url);
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$siteinfo['url'] = $url;
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$siteinfo['type'] = 'link';
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$curlResult = Network::curl($url);
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if (!$curlResult->isSuccess()) {
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return $siteinfo;
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}
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// If the file is too large then exit
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if (defaults($curlResult->getInfo(), 'download_content_length', 0) > 1000000) {
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return $siteinfo;
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}
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// If it isn't a HTML file then exit
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if (($curlResult->getContentType() != '') && !strstr(strtolower($curlResult->getContentType()), 'html')) {
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return $siteinfo;
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}
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$header = $curlResult->getHeader();
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$body = $curlResult->getBody();
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if ($do_oembed) {
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$oembed_data = OEmbed::fetchURL($url);
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if (!empty($oembed_data->type)) {
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if (!in_array($oembed_data->type, ['error', 'rich', ''])) {
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$siteinfo['type'] = $oembed_data->type;
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}
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// See https://github.com/friendica/friendica/pull/5763#discussion_r217913178
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if ($siteinfo['type'] != 'photo') {
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if (isset($oembed_data->title)) {
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$siteinfo['title'] = trim($oembed_data->title);
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}
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if (isset($oembed_data->description)) {
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$siteinfo['text'] = trim($oembed_data->description);
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}
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if (isset($oembed_data->thumbnail_url)) {
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$siteinfo['image'] = $oembed_data->thumbnail_url;
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}
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}
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}
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}
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// Fetch the first mentioned charset. Can be in body or header
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$charset = '';
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if (preg_match('/charset=(.*?)[\'"\s\n]/', $header, $matches)) {
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$charset = trim(trim(trim(array_pop($matches)), ';,'));
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}
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if ($charset && strtoupper($charset) != 'UTF-8') {
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// See https://github.com/friendica/friendica/issues/5470#issuecomment-418351211
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$charset = str_ireplace('latin-1', 'latin1', $charset);
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Logger::log('detected charset ' . $charset, Logger::DEBUG);
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$body = iconv($charset, 'UTF-8//TRANSLIT', $body);
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}
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$body = mb_convert_encoding($body, 'HTML-ENTITIES', 'UTF-8');
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$doc = new DOMDocument();
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@$doc->loadHTML($body);
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XML::deleteNode($doc, 'style');
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XML::deleteNode($doc, 'script');
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XML::deleteNode($doc, 'option');
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XML::deleteNode($doc, 'h1');
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XML::deleteNode($doc, 'h2');
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XML::deleteNode($doc, 'h3');
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XML::deleteNode($doc, 'h4');
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XML::deleteNode($doc, 'h5');
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XML::deleteNode($doc, 'h6');
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XML::deleteNode($doc, 'ol');
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XML::deleteNode($doc, 'ul');
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$xpath = new DOMXPath($doc);
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$list = $xpath->query('//meta[@content]');
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foreach ($list as $node) {
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$meta_tag = [];
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if ($node->attributes->length) {
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foreach ($node->attributes as $attribute) {
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$meta_tag[$attribute->name] = $attribute->value;
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}
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}
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if (@$meta_tag['http-equiv'] == 'refresh') {
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$path = $meta_tag['content'];
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$pathinfo = explode(';', $path);
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$content = '';
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foreach ($pathinfo as $value) {
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if (substr(strtolower($value), 0, 4) == 'url=') {
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$content = substr($value, 4);
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}
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}
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if ($content != '') {
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$siteinfo = self::getSiteinfo($content, $no_guessing, $do_oembed, ++$count);
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return $siteinfo;
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}
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}
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}
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$list = $xpath->query('//title');
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if ($list->length > 0) {
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$siteinfo['title'] = trim($list->item(0)->nodeValue);
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}
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$list = $xpath->query('//meta[@name]');
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foreach ($list as $node) {
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$meta_tag = [];
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if ($node->attributes->length) {
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foreach ($node->attributes as $attribute) {
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$meta_tag[$attribute->name] = $attribute->value;
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}
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}
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if (empty($meta_tag['content'])) {
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continue;
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}
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$meta_tag['content'] = trim(html_entity_decode($meta_tag['content'], ENT_QUOTES, 'UTF-8'));
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switch (strtolower($meta_tag['name'])) {
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case 'fulltitle':
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$siteinfo['title'] = trim($meta_tag['content']);
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break;
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case 'description':
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$siteinfo['text'] = trim($meta_tag['content']);
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break;
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case 'thumbnail':
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$siteinfo['image'] = $meta_tag['content'];
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break;
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case 'twitter:image':
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$siteinfo['image'] = $meta_tag['content'];
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break;
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case 'twitter:image:src':
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$siteinfo['image'] = $meta_tag['content'];
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break;
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case 'twitter:card':
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// Detect photo pages
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if ($meta_tag['content'] == 'summary_large_image') {
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$siteinfo['type'] = 'photo';
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}
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break;
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case 'twitter:description':
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$siteinfo['text'] = trim($meta_tag['content']);
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break;
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case 'twitter:title':
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$siteinfo['title'] = trim($meta_tag['content']);
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break;
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case 'dc.title':
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$siteinfo['title'] = trim($meta_tag['content']);
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break;
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case 'dc.description':
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$siteinfo['text'] = trim($meta_tag['content']);
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break;
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case 'keywords':
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$keywords = explode(',', $meta_tag['content']);
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break;
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case 'news_keywords':
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$keywords = explode(',', $meta_tag['content']);
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break;
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}
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}
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if (isset($keywords)) {
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$siteinfo['keywords'] = [];
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foreach ($keywords as $keyword) {
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if (!in_array(trim($keyword), $siteinfo['keywords'])) {
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$siteinfo['keywords'][] = trim($keyword);
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}
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}
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}
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$list = $xpath->query('//meta[@property]');
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foreach ($list as $node) {
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$meta_tag = [];
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if ($node->attributes->length) {
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foreach ($node->attributes as $attribute) {
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$meta_tag[$attribute->name] = $attribute->value;
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}
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}
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if (!empty($meta_tag['content'])) {
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$meta_tag['content'] = trim(html_entity_decode($meta_tag['content'], ENT_QUOTES, 'UTF-8'));
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switch (strtolower($meta_tag['property'])) {
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case 'og:image':
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$siteinfo['image'] = $meta_tag['content'];
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break;
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case 'og:title':
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$siteinfo['title'] = trim($meta_tag['content']);
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break;
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case 'og:description':
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$siteinfo['text'] = trim($meta_tag['content']);
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break;
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}
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}
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}
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// Prevent to have a photo type without an image
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if ((empty($siteinfo['image']) || !empty($siteinfo['text'])) && ($siteinfo['type'] == 'photo')) {
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$siteinfo['type'] = 'link';
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}
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if (empty($siteinfo['image']) && !$no_guessing) {
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$list = $xpath->query('//img[@src]');
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foreach ($list as $node) {
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$img_tag = [];
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if ($node->attributes->length) {
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foreach ($node->attributes as $attribute) {
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$img_tag[$attribute->name] = $attribute->value;
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}
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}
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$src = self::completeUrl($img_tag['src'], $url);
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$photodata = Image::getInfoFromURL($src);
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if (($photodata) && ($photodata[0] > 150) && ($photodata[1] > 150)) {
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if ($photodata[0] > 300) {
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$photodata[1] = round($photodata[1] * (300 / $photodata[0]));
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$photodata[0] = 300;
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}
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if ($photodata[1] > 300) {
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$photodata[0] = round($photodata[0] * (300 / $photodata[1]));
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$photodata[1] = 300;
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}
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$siteinfo['images'][] = [
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'src' => $src,
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'width' => $photodata[0],
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'height' => $photodata[1]
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];
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}
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}
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} elseif (!empty($siteinfo['image'])) {
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$src = self::completeUrl($siteinfo['image'], $url);
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unset($siteinfo['image']);
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$photodata = Image::getInfoFromURL($src);
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if (($photodata) && ($photodata[0] > 10) && ($photodata[1] > 10)) {
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$siteinfo['images'][] = ['src' => $src,
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'width' => $photodata[0],
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'height' => $photodata[1]];
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}
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}
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if ((@$siteinfo['text'] == '') && (@$siteinfo['title'] != '') && !$no_guessing) {
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$text = '';
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$list = $xpath->query('//div[@class="article"]');
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foreach ($list as $node) {
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if (strlen($node->nodeValue) > 40) {
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$text .= ' ' . trim($node->nodeValue);
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}
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}
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if ($text == '') {
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$list = $xpath->query('//div[@class="content"]');
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foreach ($list as $node) {
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if (strlen($node->nodeValue) > 40) {
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$text .= ' ' . trim($node->nodeValue);
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}
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}
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}
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// If none text was found then take the paragraph content
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if ($text == '') {
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$list = $xpath->query('//p');
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foreach ($list as $node) {
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if (strlen($node->nodeValue) > 40) {
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$text .= ' ' . trim($node->nodeValue);
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}
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}
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}
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if ($text != '') {
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$text = trim(str_replace(["\n", "\r"], [' ', ' '], $text));
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while (strpos($text, ' ')) {
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$text = trim(str_replace(' ', ' ', $text));
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}
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$siteinfo['text'] = trim(html_entity_decode(substr($text, 0, 350), ENT_QUOTES, 'UTF-8') . '...');
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}
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}
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Logger::log('Siteinfo for ' . $url . ' ' . print_r($siteinfo, true), Logger::DEBUG);
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Addon::callHooks('getsiteinfo', $siteinfo);
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return $siteinfo;
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}
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/**
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* @brief Convert tags from CSV to an array
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*
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* @param string $string Tags
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* @return array with formatted Hashtags
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*/
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public static function convertTagsToArray($string)
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{
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$arr_tags = str_getcsv($string);
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if (count($arr_tags)) {
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// add the # sign to every tag
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array_walk($arr_tags, ["self", "arrAddHashes"]);
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return $arr_tags;
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}
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}
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/**
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* @brief Add a hasht sign to a string
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*
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* This method is used as callback function
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*
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* @param string $tag The pure tag name
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* @param int $k Counter for internal use
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* @return void
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*/
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private static function arrAddHashes(&$tag, $k)
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{
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$tag = "#" . $tag;
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}
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/**
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* @brief Add a scheme to an url
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*
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* The src attribute of some html elements (e.g. images)
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* can miss the scheme so we need to add the correct
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* scheme
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*
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* @param string $url The url which possibly does have
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* a missing scheme (a link to an image)
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* @param string $scheme The url with a correct scheme
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* (e.g. the url from the webpage which does contain the image)
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*
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* @return string The url with a scheme
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*/
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private static function completeUrl($url, $scheme)
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{
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$urlarr = parse_url($url);
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// If the url does allready have an scheme
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// we can stop the process here
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if (isset($urlarr["scheme"])) {
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return($url);
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}
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$schemearr = parse_url($scheme);
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$complete = $schemearr["scheme"]."://".$schemearr["host"];
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if (!empty($schemearr["port"])) {
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$complete .= ":".$schemearr["port"];
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}
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if (!empty($urlarr["path"])) {
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if (strpos($urlarr["path"], "/") !== 0) {
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$complete .= "/";
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}
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$complete .= $urlarr["path"];
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}
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if (!empty($urlarr["query"])) {
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$complete .= "?".$urlarr["query"];
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}
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if (!empty($urlarr["fragment"])) {
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$complete .= "#".$urlarr["fragment"];
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}
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return($complete);
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}
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}
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