513 lines
14 KiB
PHP
513 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 Friendica\Content\OEmbed;
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use Friendica\Core\Addon;
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use Friendica\Object\Image;
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use Friendica\Util\Network;
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use Friendica\Util\XML;
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use dba;
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use DOMXPath;
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use DOMDocument;
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require_once 'include/dba.php';
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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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$r = q(
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"SELECT * FROM `parsed_url` WHERE `url` = '%s' AND `guessing` = %d AND `oembed` = %d",
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dbesc(normalise_link($url)),
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intval(!$no_guessing),
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intval($do_oembed)
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);
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if ($r) {
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$data = $r[0]["content"];
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}
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if (!is_null($data)) {
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$data = unserialize($data);
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return $data;
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}
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$data = self::getSiteinfo($url, $no_guessing, $do_oembed);
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dba::insert(
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'parsed_url',
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[
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'url' => normalise_link($url), 'guessing' => !$no_guessing,
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'oembed' => $do_oembed, 'content' => serialize($data),
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'created' => datetime_convert()],
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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 ($count > 10) {
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logger("parseurl_getsiteinfo: Endless loop detected for ".$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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$data = Network::curl($url);
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if (!$data['success']) {
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return($siteinfo);
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}
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// If the file is too large then exit
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if ($data["info"]["download_content_length"] > 1000000) {
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return($siteinfo);
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}
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// If it isn't a HTML file then exit
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if (($data["info"]["content_type"] != "") && !strstr(strtolower($data["info"]["content_type"]), "html")) {
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return($siteinfo);
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}
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$header = $data["header"];
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$body = $data["body"];
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if ($do_oembed) {
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$oembed_data = OEmbed::fetchURL($url);
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if (!in_array($oembed_data->type, ["error", "rich", ""])) {
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$siteinfo["type"] = $oembed_data->type;
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}
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if (($oembed_data->type == "link") && ($siteinfo["type"] != "photo")) {
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if (isset($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"] = $oembed_data->thumbnail_url;
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}
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}
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}
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// Fetch the first mentioned charset. Can be in body or header
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$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 == "") {
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$charset = "utf-8";
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}
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if (($charset != "") && (strtoupper($charset) != "UTF-8")) {
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logger("parseurl_getsiteinfo: detected charset ".$charset, LOGGER_DEBUG);
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//$body = mb_convert_encoding($body, "UTF-8", $charset);
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$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 $node) {
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$attr = [];
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if ($node->attributes->length) {
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foreach ($node->attributes as $attribute) {
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$attr[$attribute->name] = $attribute->value;
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}
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}
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if (@$attr["http-equiv"] == "refresh") {
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$path = $attr["content"];
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$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 = $xpath->query("head/meta[@name]");
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$list = $xpath->query("//meta[@name]");
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foreach ($list as $node) {
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$attr = [];
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if ($node->attributes->length) {
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foreach ($node->attributes as $attribute) {
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$attr[$attribute->name] = $attribute->value;
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}
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}
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$attr["content"] = trim(html_entity_decode($attr["content"], ENT_QUOTES, "UTF-8"));
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if ($attr["content"] != "") {
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switch (strtolower($attr["name"])) {
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case "fulltitle":
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$siteinfo["title"] = trim($attr["content"]);
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break;
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case "description":
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$siteinfo["text"] = trim($attr["content"]);
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break;
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case "thumbnail":
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$siteinfo["image"] = $attr["content"];
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break;
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case "twitter:image":
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$siteinfo["image"] = $attr["content"];
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break;
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case "twitter:image:src":
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$siteinfo["image"] = $attr["content"];
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break;
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case "twitter:card":
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if (($siteinfo["type"] == "") || ($attr["content"] == "photo")) {
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$siteinfo["type"] = $attr["content"];
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}
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break;
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case "twitter:description":
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$siteinfo["text"] = trim($attr["content"]);
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break;
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case "twitter:title":
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$siteinfo["title"] = trim($attr["content"]);
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break;
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case "dc.title":
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$siteinfo["title"] = trim($attr["content"]);
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break;
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case "dc.description":
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$siteinfo["text"] = trim($attr["content"]);
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break;
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case "keywords":
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$keywords = explode(",", $attr["content"]);
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break;
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case "news_keywords":
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$keywords = explode(",", $attr["content"]);
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break;
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}
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}
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if ($siteinfo["type"] == "summary") {
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$siteinfo["type"] = "link";
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}
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}
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if (isset($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 = $xpath->query("head/meta[@property]");
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$list = $xpath->query("//meta[@property]");
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foreach ($list as $node) {
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$attr = [];
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if ($node->attributes->length) {
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foreach ($node->attributes as $attribute) {
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$attr[$attribute->name] = $attribute->value;
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}
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}
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$attr["content"] = trim(html_entity_decode($attr["content"], ENT_QUOTES, "UTF-8"));
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if ($attr["content"] != "") {
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switch (strtolower($attr["property"])) {
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case "og:image":
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$siteinfo["image"] = $attr["content"];
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break;
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case "og:title":
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$siteinfo["title"] = trim($attr["content"]);
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break;
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case "og:description":
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$siteinfo["text"] = trim($attr["content"]);
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break;
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}
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}
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}
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if ((@$siteinfo["image"] == "") && !$no_guessing) {
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$list = $xpath->query("//img[@src]");
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foreach ($list as $node) {
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$attr = [];
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if ($node->attributes->length) {
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foreach ($node->attributes as $attribute) {
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$attr[$attribute->name] = $attribute->value;
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}
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}
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$src = self::completeUrl($attr["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"][] = ["src" => $src,
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"width" => $photodata[0],
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"height" => $photodata[1]];
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}
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}
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} elseif ($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($text, 0, 350), ENT_QUOTES, "UTF-8").'...');
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}
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}
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logger("parseurl_getsiteinfo: Siteinfo for ".$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 (@$schemearr["port"] != "") {
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$complete .= ":".$schemearr["port"];
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}
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if (strpos($urlarr["path"], "/") !== 0) {
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$complete .= "/";
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}
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$complete .= $urlarr["path"];
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if (@$urlarr["query"] != "") {
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$complete .= "?".$urlarr["query"];
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}
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if (@$urlarr["fragment"] != "") {
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$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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