friendica/mod/parse_url.php

<?php
if(!function_exists('deletenode')) {
	function deletenode(&$doc, $node)
	{
		$xpath = new DomXPath($doc);
		$list = $xpath->query("//".$node);
		foreach ($list as $child)
			$child->parentNode->removeChild($child);
	}
}

function completeurl($url, $scheme) {
        $urlarr = parse_url($url);

        if (isset($urlarr["scheme"]))
                return($url);

        $schemearr = parse_url($scheme);

        $complete = $schemearr["scheme"]."://".$schemearr["host"];

        if ($schemearr["port"] != "")
                $complete .= ":".$schemearr["port"];

        $complete .= $urlarr["path"];

        if ($urlarr["query"] != "")
                $complete .= "?".$urlarr["query"];

        if ($urlarr["fragment"] != "")
                $complete .= "#".$urlarr["fragment"];

        return($complete);
}

function parseurl_getsiteinfo($url) {
	$siteinfo = array();

	$ch = curl_init();
	curl_setopt($ch, CURLOPT_URL, $url);
	curl_setopt($ch, CURLOPT_HEADER, 1);
	curl_setopt($ch, CURLOPT_NOBODY, 0);
	curl_setopt($ch, CURLOPT_TIMEOUT, 3);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
	curl_setopt($ch,CURLOPT_USERAGENT,'Opera/9.64(Windows NT 5.1; U; de) Presto/2.1.1');

	$header = curl_exec($ch);
	curl_close($ch);

	// Fetch the first mentioned charset. Can be in body or header
	if (preg_match('/charset=(.*?)['."'".'"\s\n]/', $header, $matches))
		$charset = trim(array_pop($matches));
	else
		$charset = "utf-8";

	$pos = strpos($header, "\r\n\r\n");

	if ($pos)
		$body = trim(substr($header, $pos));
	else
		$body = $header;

	$body = mb_convert_encoding($body, "UTF-8", $charset);
	$body = mb_convert_encoding($body, 'HTML-ENTITIES', "UTF-8");

	$doc = new DOMDocument();
	@$doc->loadHTML($body);

	deletenode($doc, 'style');
	deletenode($doc, 'script');
	deletenode($doc, 'option');
	deletenode($doc, 'h1');
	deletenode($doc, 'h2');
	deletenode($doc, 'h3');
	deletenode($doc, 'h4');
	deletenode($doc, 'h5');
	deletenode($doc, 'h6');
	deletenode($doc, 'ol');
	deletenode($doc, 'ul');

	$xpath = new DomXPath($doc);

	//$list = $xpath->query("head/title");
	$list = $xpath->query("//title");
	foreach ($list as $node)
		$siteinfo["title"] =  html_entity_decode($node->nodeValue, ENT_QUOTES, "UTF-8");

	//$list = $xpath->query("head/meta[@name]");
	$list = $xpath->query("//meta[@name]");
	foreach ($list as $node) {
		$attr = array();
		if ($node->attributes->length)
                        foreach ($node->attributes as $attribute)
                                $attr[$attribute->name] = $attribute->value;

		$attr["content"] = html_entity_decode($attr["content"], ENT_QUOTES, "UTF-8");

		switch (strtolower($attr["name"])) {
			case "fulltitle":
				$siteinfo["title"] = $attr["content"];
				break;
			case "description":
				$siteinfo["text"] = $attr["content"];
				break;
			case "dc.title":
				$siteinfo["title"] = $attr["content"];
				break;
			case "dc.description":
				$siteinfo["text"] = $attr["content"];
				break;
		}
	}

	//$list = $xpath->query("head/meta[@property]");
	$list = $xpath->query("//meta[@property]");
	foreach ($list as $node) {
		$attr = array();
		if ($node->attributes->length)
                        foreach ($node->attributes as $attribute)
                                $attr[$attribute->name] = $attribute->value;

		$attr["content"] = html_entity_decode($attr["content"], ENT_QUOTES, "UTF-8");

		switch (strtolower($attr["property"])) {
			case "og:image":
				$siteinfo["image"] = $attr["content"];
				break;
			case "og:title":
				$siteinfo["title"] = $attr["content"];
				break;
			case "og:description":
				$siteinfo["text"] = $attr["content"];
				break;
		}
	}

	if ($siteinfo["image"] == "") {
                $list = $xpath->query("//img[@src]");
                foreach ($list as $node) {
                        $attr = array();
                        if ($node->attributes->length)
                                foreach ($node->attributes as $attribute)
                                        $attr[$attribute->name] = $attribute->value;

			$src = completeurl($attr["src"], $url);
			$photodata = getimagesize($src);

			if (($photodata[0] > 150) and ($photodata[1] > 150)) {
				if ($photodata[0] > 300) {
					$photodata[1] = $photodata[1] * (300 / $photodata[0]);
					$photodata[0] = 300;
				}
				if ($photodata[1] > 300) {
					$photodata[0] = $photodata[0] * (300 / $photodata[1]);
					$photodata[1] = 300;
				}
				$siteinfo["images"][] = array("src"=>$src,
								"width"=>$photodata[0],
								"height"=>$photodata[1]);
			}

                }
        } else {
		$src = completeurl($siteinfo["image"], $url);
		$photodata = getimagesize($src);

		if (($photodata[0] > 10) and ($photodata[1] > 10))
			$siteinfo["images"][] = array("src"=>$src,
							"width"=>$photodata[0],
							"height"=>$photodata[1]);
	}

	if ($siteinfo["text"] == "") {
		$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(array("\n", "\r"), array(" ", " "), $text));

			while (strpos($text, "  "))
				$text = trim(str_replace("  ", " ", $text));

			$siteinfo["text"] = html_entity_decode(substr($text,0,350), ENT_QUOTES, "UTF-8").'...';
		}
	}

	return($siteinfo);
}

function arr_add_hashes(&$item,$k) {
	$item = '#' . $item;
}

function parse_url_content(&$a) {

	$text = null;
	$str_tags = '';

	$textmode = false;
	if(local_user() && intval(get_pconfig(local_user(),'system','plaintext')))
		$textmode = true;

	//if($textmode)
	$br = (($textmode) ? "\n" : '<br />');

	if(x($_GET,'binurl'))
		$url = trim(hex2bin($_GET['binurl']));
	else
		$url = trim($_GET['url']);

	if($_GET['title'])
		$title = strip_tags(trim($_GET['title']));

	if($_GET['description'])
		$text = strip_tags(trim($_GET['description']));

	if($_GET['tags']) {
		$arr_tags = str_getcsv($_GET['tags']);
		if(count($arr_tags)) {
			array_walk($arr_tags,'arr_add_hashes');
			$str_tags = $br . implode(' ',$arr_tags) . $br;
		}
	}

	logger('parse_url: ' . $url);

	if($textmode)
		$template = $br . '[bookmark=%s]%s[/bookmark]%s' . $br;
	else
		$template = "<br /><a class=\"bookmark\" href=\"%s\" >%s</a>%s<br />";

	$arr = array('url' => $url, 'text' => '');

	call_hooks('parse_link', $arr);

	if(strlen($arr['text'])) {
		echo $arr['text'];
		killme();
	}


	if($url && $title && $text) {

		if($textmode)
			$text = $br . '[quote]' . trim($text) . '[/quote]' . $br;
		else
			$text = '<br /><blockquote>' . trim($text) . '</blockquote><br />';

		$title = str_replace(array("\r","\n"),array('',''),$title);

		$result = sprintf($template,$url,($title) ? $title : $url,$text) . $str_tags;

		logger('parse_url (unparsed): returns: ' . $result);

		echo $result;
		killme();
	}

	$siteinfo = parseurl_getsiteinfo($url);

	if($siteinfo["title"] == "") {
		echo print_r($siteinfo, true);
		//echo sprintf($template,$url,$url,'') . $str_tags;
		killme();
	} else {
		$text = $siteinfo["text"];
		$title = $siteinfo["title"];
	}

	$image = "";

	foreach ($siteinfo["images"] as $imagedata)
		if($textmode)
			$image .= '[img='.$imagedata["width"].'x'.$imagedata["height"].']'.$imagedata["src"].'[/img]';
		else
			$image .= '<img height="'.$imagedata["height"].'" width="'.$imagedata["width"].'" src="'.$imagedata["src"].'" alt="photo" />';

	if(strlen($text)) {
		if($textmode)
			$text = $br.'[quote]'.trim($text).'[/quote]'.$br ;
		else
			$text = '<br /><blockquote>'.trim($text).'</blockquote><br />';
	}

	if($image) {
		$text = $br.$br.$image.$text;
	}
	$title = str_replace(array("\r","\n"),array('',''),$title);

	$result = sprintf($template,$url,($title) ? $title : $url,$text) . $str_tags;

	logger('parse_url: returns: ' . $result);

	echo trim($result);
	killme();
}