<?php

require_once('library/HTML5/Parser.php');

if(! function_exists('scrape_dfrn')) {
function scrape_dfrn($url) {

	$a = get_app();

	$ret = array();

	logger('scrape_dfrn: url=' . $url);

	$s = fetch_url($url);

	if(! $s) 
		return $ret;

	$headers = $a->get_curl_headers();
	logger('scrape_dfrn: headers=' . $headers, LOGGER_DEBUG);


	$lines = explode("\n",$headers);
	if(count($lines)) {
		foreach($lines as $line) {				
			// don't try and run feeds through the html5 parser
			if(stristr($line,'content-type:') && ((stristr($line,'application/atom+xml')) || (stristr($line,'application/rss+xml'))))
				return ret;
		}
	}


	$dom = HTML5_Parser::parse($s);

	if(! $dom)
		return $ret;

	$items = $dom->getElementsByTagName('link');

	// get DFRN link elements

	foreach($items as $item) {
		$x = $item->getAttribute('rel');
		if(($x === 'alternate') && ($item->getAttribute('type') === 'application/atom+xml'))
			$ret['feed_atom'] = $item->getAttribute('href');
		if(substr($x,0,5) == "dfrn-")
			$ret[$x] = $item->getAttribute('href');
		if($x === 'lrdd') {
			$decoded = urldecode($item->getAttribute('href'));
			if(preg_match('/acct:([^@]*)@/',$decoded,$matches))
				$ret['nick'] = $matches[1];
		}
	}

	// Pull out hCard profile elements

	$items = $dom->getElementsByTagName('*');
	foreach($items as $item) {
		if(attribute_contains($item->getAttribute('class'), 'vcard')) {
			$level2 = $item->getElementsByTagName('*');
			foreach($level2 as $x) {
				if(attribute_contains($x->getAttribute('class'),'fn'))
					$ret['fn'] = $x->textContent;
				if(attribute_contains($x->getAttribute('class'),'photo'))
					$ret['photo'] = $x->getAttribute('src');
				if(attribute_contains($x->getAttribute('class'),'key'))
					$ret['key'] = $x->textContent;
			}
		}
	}

	return $ret;
}}


if(! function_exists('validate_dfrn')) {
function validate_dfrn($a) {
	$errors = 0;
	if(! x($a,'key'))
		$errors ++;
	if(! x($a,'dfrn-request'))
		$errors ++;
	if(! x($a,'dfrn-confirm'))
		$errors ++;
	if(! x($a,'dfrn-notify'))
		$errors ++;
	if(! x($a,'dfrn-poll'))
		$errors ++;
	return $errors;
}}

if(! function_exists('scrape_meta')) {
function scrape_meta($url) {

	$a = get_app();

	$ret = array();

	logger('scrape_meta: url=' . $url);

	$s = fetch_url($url);

	if(! $s) 
		return $ret;

	$headers = $a->get_curl_headers();
	logger('scrape_meta: headers=' . $headers, LOGGER_DEBUG);

	$lines = explode("\n",$headers);
	if(count($lines)) {
		foreach($lines as $line) {				
			// don't try and run feeds through the html5 parser
			if(stristr($line,'content-type:') && ((stristr($line,'application/atom+xml')) || (stristr($line,'application/rss+xml'))))
				return ret;
		}
	}


	$dom = HTML5_Parser::parse($s);

	if(! $dom)
		return $ret;

	$items = $dom->getElementsByTagName('meta');

	// get DFRN link elements

	foreach($items as $item) {
		$x = $item->getAttribute('name');
		if(substr($x,0,5) == "dfrn-")
			$ret[$x] = $item->getAttribute('content');
	}

	return $ret;
}}


if(! function_exists('scrape_vcard')) {
function scrape_vcard($url) {

	$a = get_app();

	$ret = array();

	logger('scrape_vcard: url=' . $url);

	$s = fetch_url($url);

	if(! $s) 
		return $ret;

	$headers = $a->get_curl_headers();
	$lines = explode("\n",$headers);
	if(count($lines)) {
		foreach($lines as $line) {				
			// don't try and run feeds through the html5 parser
			if(stristr($line,'content-type:') && ((stristr($line,'application/atom+xml')) || (stristr($line,'application/rss+xml'))))
				return ret;
		}
	}

	$dom = HTML5_Parser::parse($s);

	if(! $dom)
		return $ret;

	// Pull out hCard profile elements

	$items = $dom->getElementsByTagName('*');
	foreach($items as $item) {
		if(attribute_contains($item->getAttribute('class'), 'vcard')) {
			$level2 = $item->getElementsByTagName('*');
			foreach($level2 as $x) {
				if(attribute_contains($x->getAttribute('class'),'fn'))
					$ret['fn'] = $x->textContent;
				if((attribute_contains($x->getAttribute('class'),'photo'))
					|| (attribute_contains($x->getAttribute('class'),'avatar')))
					$ret['photo'] = $x->getAttribute('src');
				if((attribute_contains($x->getAttribute('class'),'nickname'))
					|| (attribute_contains($x->getAttribute('class'),'uid')))
					$ret['nick'] = $x->textContent;
			}
		}
	}

	return $ret;
}}


if(! function_exists('scrape_feed')) {
function scrape_feed($url) {

	$a = get_app();

	$ret = array();
	$s = fetch_url($url);

	if(! $s) 
		return $ret;

	$headers = $a->get_curl_headers();
	logger('scrape_feed: headers=' . $headers, LOGGER_DEBUG);

	$lines = explode("\n",$headers);
	if(count($lines)) {
		foreach($lines as $line) {				
			if(stristr($line,'content-type:')) {
				if(stristr($line,'application/atom+xml') || stristr($s,'<feed')) {
					$ret['feed_atom'] = $url;
					return $ret;
				}
 				if(stristr($line,'application/rss+xml') || stristr($s,'<rss')) {
					$ret['feed_rss'] = $url;
					return $ret;
				}
			}
		}
	}

	$dom = HTML5_Parser::parse($s);

	if(! $dom)
		return $ret;


	$items = $dom->getElementsByTagName('img');

	// get img elements (twitter)

	if($items) {
		foreach($items as $item) {
			$x = $item->getAttribute('id');
			if($x === 'profile-image') {
				$ret['photo'] = $item->getAttribute('src');
			}
		}
	}

	$items = $dom->getElementsByTagName('link');

	// get Atom/RSS link elements, take the first one of either.

	if($items) {
		foreach($items as $item) {
			$x = $item->getAttribute('rel');
			if(($x === 'alternate') && ($item->getAttribute('type') === 'application/atom+xml')) {
				if(! x($ret,'feed_atom'))
					$ret['feed_atom'] = $item->getAttribute('href');
			}
			if(($x === 'alternate') && ($item->getAttribute('type') === 'application/rss+xml')) {
				if(! x($ret,'feed_rss'))
					$ret['feed_rss'] = $item->getAttribute('href');
			}
		}	
	}

	return $ret;
}}


function probe_url($url) {

	$result = array();

	if(! $url)
		return $result;

	$diaspora = false;	
	$email_conversant = false;

	if($url) {
		$links = lrdd($url);

		if(count($links)) {
			foreach($links as $link) {
				if($link['@attributes']['rel'] === NAMESPACE_DFRN)
					$dfrn = unamp($link['@attributes']['href']);
				if($link['@attributes']['rel'] === 'salmon')
					$notify = unamp($link['@attributes']['href']);
				if($link['@attributes']['rel'] === NAMESPACE_FEED)
					$poll = unamp($link['@attributes']['href']);
				if($link['@attributes']['rel'] === 'http://microformats.org/profile/hcard')
					$hcard = unamp($link['@attributes']['href']);
				if($link['@attributes']['rel'] === 'http://webfinger.net/rel/profile-page')
					$profile = unamp($link['@attributes']['href']);
				if($link['@attributes']['rel'] === 'http://joindiaspora.com/seed_location')
					$diaspora = true;
			}

			// Status.Net can have more than one profile URL. We need to match the profile URL
			// to a contact on incoming messages to prevent spam, and we won't know which one
			// to match. So in case of two, one of them is stored as an alias. Only store URL's
			// and not webfinger user@host aliases. If they've got more than two non-email style
			// aliases, let's hope we're lucky and get one that matches the feed author-uri because 
			// otherwise we're screwed.

			foreach($links as $link) {
				if($link['@attributes']['rel'] === 'alias') {
					if(strpos($link['@attributes']['href'],'@') === false) {
						if(isset($profile)) {
							if($link['@attributes']['href'] !== $profile)
								$alias = unamp($link['@attributes']['href']);
						}
						else
							$profile = unamp($link['@attributes']['href']);
					}
				}
			}
		}
		else {
			if((strpos($orig_url,'@')) && validate_email($orig_url)) {
				$email_conversant = true;
			}
		}
	}	

	if(strlen($dfrn)) {
		$ret = scrape_dfrn($dfrn);
		if(is_array($ret) && x($ret,'dfrn-request')) {
			$network = NETWORK_DFRN;
			$request = $ret['dfrn-request'];
			$confirm = $ret['dfrn-confirm'];
			$notify  = $ret['dfrn-notify'];
			$poll    = $ret['dfrn-poll'];
		}
	}

	if($network !== NETWORK_DFRN) {
		$network  = NETWORK_OSTATUS;
		$priority = 0;

		if($hcard) {
			$vcard = scrape_vcard($hcard);

			// Google doesn't use absolute url in profile photos
	
			if((x($vcard,'photo')) && substr($vcard['photo'],0,1) == '/') {
				$h = @parse_url($hcard);
				if($h)
					$vcard['photo'] = $h['scheme'] . '://' . $h['host'] . $vcard['photo'];
			}
		
			logger('probe_url: scrape_vcard: ' . print_r($vcard,true), LOGGER_DATA);
		}

		if(! $profile) {
			if($diaspora)
				$profile = $hcard;
			else
				$profile = $url;
		}

		if(! x($vcard,'fn'))
			if(x($vcard,'nick'))
				$vcard['fn'] = $vcard['nick'];

		if((! isset($vcard)) && (! $poll)) {

			$ret = scrape_feed($url);
			logger('probe_url: scrape_feed returns: ' . print_r($ret,true), LOGGER_DATA);
			if(count($ret) && ($ret['feed_atom'] || $ret['feed_rss'])) {
				$poll = ((x($ret,'feed_atom')) ? unamp($ret['feed_atom']) : unamp($ret['feed_rss']));
				$vcard = array();
					if(x($ret,'photo'))
						$vcard['photo'] = $ret['photo'];
				require_once('simplepie/simplepie.inc');
			    $feed = new SimplePie();
				$xml = fetch_url($poll);

    			$feed->set_raw_data($xml);

			    $feed->init();

				if(! x($vcard,'photo'))
					$vcard['photo'] = $feed->get_image_url();
				$author = $feed->get_author();
				if($author) {			
					$vcard['fn'] = unxmlify(trim($author->get_name()));
					if(! $vcard['fn'])
						$vcard['fn'] = trim(unxmlify($author->get_email()));
					if(strpos($vcard['fn'],'@') !== false)
						$vcard['fn'] = substr($vcard['fn'],0,strpos($vcard['fn'],'@'));
					$vcard['nick'] = strtolower(notags(unxmlify($vcard['fn'])));
					if(strpos($vcard['nick'],' '))
						$vcard['nick'] = trim(substr($vcard['nick'],0,strpos($vcard['nick'],' ')));
					$email = unxmlify($author->get_email());
				}
				else {
					$item = $feed->get_item(0);
					if($item) {
						$author = $item->get_author();
						if($author) {			
							$vcard['fn'] = trim(unxmlify($author->get_name()));
							if(! $vcard['fn'])
								$vcard['fn'] = trim(unxmlify($author->get_email()));
							if(strpos($vcard['fn'],'@') !== false)
								$vcard['fn'] = substr($vcard['fn'],0,strpos($vcard['fn'],'@'));
							$vcard['nick'] = strtolower(unxmlify($vcard['fn']));
							if(strpos($vcard['nick'],' '))
								$vcard['nick'] = trim(substr($vcard['nick'],0,strpos($vcard['nick'],' ')));
							$email = unxmlify($author->get_email());
						}
						if(! $vcard['photo']) {
							$rawmedia = $item->get_item_tags('http://search.yahoo.com/mrss/','thumbnail');
							if($rawmedia && $rawmedia[0]['attribs']['']['url'])
								$vcard['photo'] = unxmlify($rawmedia[0]['attribs']['']['url']);
						}
					}
				}
				if((! $vcard['photo']) && strlen($email))
					$vcard['photo'] = gravatar_img($email);
				if($poll === $profile)
					$lnk = $feed->get_permalink();
				if(isset($lnk) && strlen($lnk))
					$profile = $lnk;	
				if(! (x($vcard,'fn')))
					$vcard['fn'] = notags($feed->get_title());
				if(! (x($vcard,'fn')))
					$vcard['fn'] = notags($feed->get_description());
				$network = 'feed';
				$priority = 2;
			}
		}
	}

	if(! x($vcard,'photo')) {
		$a = get_app();
		$vcard['photo'] = $a->get_baseurl() . '/images/default-profile.jpg' ; 
	}
	$vcard['fn'] = notags($vcard['fn']);
	$vcard['nick'] = notags($vcard['nick']);

	$result['name'] = $vcard['fn'];
	$result['nick'] = $vcard['nick'];
	$result['url'] = $profile;
	$result['notify'] = $notify;
	$result['poll'] = $poll;
	$result['request'] = $request;
	$result['confirm'] = $confirm;
	$result['photo'] = $vcard['photo'];
	$result['priority'] = $priority;
	$result['network'] = $network;
	$result['alias'] = $alias;

	logger('probe_url: ' . print_r($result,true), LOGGER_DEBUG);

	return $result;
}