path: root/mod/linkinfo.php

<?php


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



function linkinfo_content(&$a) {

	logger('linkinfo: ' . print_r($_REQUEST,true));

	$text = null;
	$str_tags = '';


	$br = "\n";

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

	if((substr($url,0,1) != '/') && (substr($url,0,4) != 'http'))
		$url = 'http://' . $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('linkinfo: ' . $url);

	$result = z_fetch_url($url,false,0,array('novalidate' => true, 'nobody' => true));
	if($result['success']) {
		$hdrs=array();
		$h = explode("\n",$result['header']);
		foreach ($h as $l) {
			list($k,$v) = array_map("trim", explode(":", trim($l), 2));
			$hdrs[$k] = $v;
		}
		if (array_key_exists('Content-Type', $hdrs))
			$type = $hdrs['Content-Type'];
		if($type) {
			$zrl = is_matrix_url($url);
			if(stripos($type,'image/') !== false) {
				if($zrl)
					echo $br . '[zmg]' . $url . '[/zmg]' . $br;
				else
					echo $br . '[img]' . $url . '[/img]' . $br;
				killme();
			}
			if(stripos($type,'video/') !== false) {
				if($zrl)
					echo $br . '[zvideo]' . $url . '[/zvideo]' . $br;
				else
					echo $br . '[video]' . $url . '[/video]' . $br;
				killme();
			}
			if(stripos($type,'audio/') !== false) {
				if($zrl)
					echo $br . '[zaudio]' . $url . '[/zaudio]' . $br;
				else
					echo $br . '[audio]' . $url . '[/audio]' . $br;
				killme();
			}
		}
	}

	$template = $br . '#^[url=%s]%s[/url]%s' . $br;

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

	call_hooks('parse_link', $arr);

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

	$x = oembed_process($url);
	if($x) {
		echo $x;
		killme();
	}

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

		$text = $br . '[quote]' . trim($text) . '[/quote]' . $br;

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

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

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

		echo $result;
		killme();
	}

	$siteinfo = parseurl_getsiteinfo($url);

	// If this is a Red site, use zrl rather than url so they get zids sent to them by default

	if( x($siteinfo,'generator') && (strpos($siteinfo['generator'],PLATFORM_NAME . ' ') === 0))
		$template = str_replace('url','zrl',$template);

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

	$image = "";

	if(sizeof($siteinfo["images"]) > 0){
		/* Execute below code only if image is present in siteinfo */

		$total_images = 0;
		$max_images = get_config('system','max_bookmark_images');
		if($max_images === false)
			$max_images = 2;
		else
			$max_images = intval($max_images);

		foreach ($siteinfo["images"] as $imagedata) {
                        if ($url) {
                            $image .= sprintf('[url=%s]', $url);
                        }
			$image .= '[img='.$imagedata["width"].'x'.$imagedata["height"].']'.$imagedata["src"].'[/img]';
                        if ($url) {
                            $image .= '[/url]';
                        }
                        $image .= "\n";
			$total_images ++;
			if($max_images && $max_images >= $total_images)
				break;
        }
	}

	if(strlen($text)) {
		$text = $br.'[quote]'.trim($text).'[/quote]'.$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('linkinfo: returns: ' . $result, LOGGER_DEBUG);

	echo trim($result);
	killme();

}


function deletexnode(&$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"];

		if(strpos($urlarr['path'],'/') !== 0)
			$complete .= '/';

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

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

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

        return($complete);
}


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


	$result = z_fetch_url($url,false,0,array('novalidate' => true));
	if(! $result['success'])
		return $siteinfo;

	$header = $result['header'];
	$body   = $result['body'];

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

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

	deletexnode($doc, 'style');
	deletexnode($doc, 'script');
	deletexnode($doc, 'option');
	deletexnode($doc, 'h1');
	deletexnode($doc, 'h2');
	deletexnode($doc, 'h3');
	deletexnode($doc, 'h4');
	deletexnode($doc, 'h5');
	deletexnode($doc, 'h6');
	deletexnode($doc, 'ol');
	deletexnode($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 'generator':
				$siteinfo['generator'] = $attr['content'];
				break;
			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 (($photodata) && ($photodata[0] > 150) and ($photodata[1] > 150)) {
				if ($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;
				}
				$siteinfo["images"][] = array("src"=>$src,
								"width"=>$photodata[0],
								"height"=>$photodata[1]);
			}

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

		unset($siteinfo["image"]);

		$photodata = @getimagesize($src);

		if (($photodata) && ($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);
}