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