friendica/include/Scrape.php

<?php

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

	$largest_photo = 0;

	$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'))) {
					$size = intval($x->getAttribute('width'));
					// dfrn prefers 175, so if we find this, we set largest_size so it can't be topped.
					if(($size > $largest_photo) || ($size == 175) || (! $largest_photo)) {
						$ret['photo'] = $x->getAttribute('src');
						$largest_photo = (($size == 175) ? 9999 : $size);
					}
				}
				if(attribute_contains($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

	$largest_photo = 0;

	$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'))) {
					$size = intval($x->getAttribute('width'));
					if(($size > $largest_photo) || (! $largest_photo)) {
						$ret['photo'] = $x->getAttribute('src');
						$largest_photo = $size;
					}
				}
				if((attribute_contains($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');
			}
		}
	}


	$head = $dom->getElementsByTagName('base');
	if($head) {
		foreach($head as $head0) {
			$basename = $head0->getAttribute('href');
			break;
		}
	}
	if(! $basename)
		$basename = substr($url,0,strrpos($url,'/')) . '/';

	$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');
			}
		}	
	}

	// Drupal and perhaps others only provide relative URL's. Turn them into absolute.

	if(x($ret,'feed_atom') && (! strstr($ret['feed_atom'],'://')))
		$ret['feed_atom'] = $basename . $ret['feed_atom'];
	if(x($ret,'feed_rss') && (! strstr($ret['feed_rss'],'://')))
		$ret['feed_rss'] = $basename . $ret['feed_rss'];

	return $ret;
}}


/**
 *
 * Probe a network address to discover what kind of protocols we need to communicate with it.
 *
 * Warning: this function is a bit touchy and there are some subtle dependencies within the logic flow.
 * Edit with care.
 *
 */

/**
 *
 * PROBE_DIASPORA has a bias towards returning Diaspora information
 * while PROBE_NORMAL has a bias towards dfrn/zot - in the case where
 * an address (such as a Friendika address) supports more than one type
 * of network. 
 *
 */


define ( 'PROBE_NORMAL',   0);
define ( 'PROBE_DIASPORA', 1);

function probe_url($url, $mode = PROBE_NORMAL) {
	require_once('include/email.php');

	$result = array();

	if(! $url)
		return $result;

	$network = null;
	$diaspora = false;
	$diaspora_base = '';
	$diaspora_guid = '';	
	$diaspora_key = '';
	$has_lrdd = false;
	$email_conversant = false;

	$twitter = ((strpos($url,'twitter.com') !== false) ? true : false);

	$at_addr = ((strpos($url,'@') !== false) ? true : false);

	if(! $twitter) {

		if(strpos($url,'mailto:') !== false && $at_addr) {
			$url = str_replace('mailto:','',$url);
			$links = array();
		}
		else
			$links = lrdd($url);

		if(count($links)) {
			$has_lrdd = true;

			logger('probe_url: found lrdd links: ' . print_r($links,true), LOGGER_DATA);
			foreach($links as $link) {
				if($link['@attributes']['rel'] === NAMESPACE_ZOT)
					$zot = unamp($link['@attributes']['href']);
				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') {
					$diaspora_base = unamp($link['@attributes']['href']);
					$diaspora = true;
				}
				if($link['@attributes']['rel'] === 'http://joindiaspora.com/guid') {
					$diaspora_guid = unamp($link['@attributes']['href']);
					$diaspora = true;
				}
				if($link['@attributes']['rel'] === 'diaspora-public-key') {
					$diaspora_key = base64_decode(unamp($link['@attributes']['href']));
					$pubkey = rsatopem($diaspora_key);
					$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']);
					}
				}
			}
		}
		elseif($mode == PROBE_NORMAL) {

			// Check email

			$orig_url = $url;
			if((strpos($orig_url,'@')) && validate_email($orig_url)) {
				$x = q("SELECT `prvkey` FROM `user` WHERE `uid` = %d LIMIT 1",
					intval(local_user())
				);
				$r = q("SELECT * FROM `mailacct` WHERE `uid` = %d AND `server` != '' LIMIT 1",
					intval(local_user())
				);
				if(count($x) && count($r)) {
				    $mailbox = construct_mailbox_name($r[0]);
					$password = '';
					openssl_private_decrypt(hex2bin($r[0]['pass']),$password,$x[0]['prvkey']);
					$mbox = email_connect($mailbox,$r[0]['user'],$password);
					unset($password);
				}
				if($mbox) {
					$msgs = email_poll($mbox,$orig_url);
					if(count($msgs)) {
						$addr = $orig_url;
						$network = NETWORK_MAIL;
						$name = substr($url,0,strpos($url,'@'));
						$profile = 'http://' . substr($url,strpos($url,'@')+1);
						// fix nick character range
						$vcard = array('fn' => $name, 'nick' => $name, 'photo' => gravatar_img($url));
						$notify = 'smtp ' . random_string();
						$poll = 'email ' . random_string();
						$priority = 0;
						$x = email_msg_meta($mbox,$msgs[0]);
						if(stristr($x->from,$orig_url))
							$adr = imap_rfc822_parse_adrlist($x->from,'');
						elseif(stristr($x->to,$orig_url))
							$adr = imap_rfc822_parse_adrlist($x->to,'');
						if(isset($adr) && strlen($adr[0]->personal))
							$vcard['fn'] = notags($adr[0]->personal);
					}
					imap_close($mbox);
				}
			}
		}
	}	

	if($mode == PROBE_NORMAL) {
		if(strlen($zot)) {
			$s = fetch_url($zot);
			if($s) {
				$j = json_decode($s);
				if($j) {
					$network = NETWORK_ZOT;
					$vcard   = array(
						'fn'    => $j->fullname, 
						'nick'  => $j->nickname, 
						'photo' => $j->photo
					);
					$profile  = $j->url;
					$notify   = $j->post;
					$pubkey   = $j->pubkey;
					$poll     = 'N/A';
				}
			}
		}

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

				$vcard = array();
				$vcard['fn'] = $ret['fn'];
				$vcard['nick'] = $ret['nick'];
				$vcard['photo'] = $ret['photo'];
			}
		}
	}

	if($diaspora && $diaspora_base && $diaspora_guid) {
		if($mode == PROBE_DIASPORA || ! $notify)
			$notify = $diaspora_base . 'receive/users/' . $diaspora_guid;
		if(strpos($url,'@'))
			$addr = str_replace('acct:', '', $url);
	}			

	if($network !== NETWORK_ZOT && $network !== NETWORK_DFRN && $network !== NETWORK_MAIL) {
		if($diaspora)
			$network = NETWORK_DIASPORA;
		elseif($has_lrdd)
			$network  = NETWORK_OSTATUS;
		$priority = 0;

		if($hcard && ! $vcard) {
			$vcard = scrape_vcard($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($twitter) {		
			logger('twitter: setup');
			$tid = basename($url);
			$tapi = 'https://api.twitter.com/1/statuses/user_timeline.rss';
			if(intval($tid))
				$poll = $tapi . '?user_id=' . $tid;
			else
				$poll = $tapi . '?screen_name=' . $tid;
			$profile = 'http://twitter.com/#!/' . $tid;
		}

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

		$check_feed = false;

		if($twitter || ! $poll)
			$check_feed = true;
		if((! isset($vcard)) || (! $profile))
			$check_feed = true;
		if(($at_addr) && (! count($links)))
			$check_feed = false;

		if($check_feed) {

			$feedret = scrape_feed(($poll) ? $poll : $url);
			logger('probe_url: scrape_feed returns: ' . print_r($feedret,true), LOGGER_DATA);
			if(count($feedret) && ($feedret['feed_atom'] || $feedret['feed_rss'])) {
				$poll = ((x($feedret,'feed_atom')) ? unamp($feedret['feed_atom']) : unamp($feedret['feed_rss']));
				if(! x($vcard)) 
					$vcard = array();
			}

			if(x($feedret,'photo') && (! x($vcard,'photo')))
				$vcard['photo'] = $feedret['photo'];
			require_once('library/simplepie/simplepie.inc');
		    $feed = new SimplePie();
			$xml = fetch_url($poll);

			logger('probe_url: fetch feed: ' . $poll . ' returns: ' . $xml, LOGGER_DATA);
			$a = get_app();

			logger('probe_url: scrape_feed: headers: ' . $a->get_curl_headers(), $LOGGER_DATA);

   			$feed->set_raw_data($xml);

		    $feed->init();
			if($feed->error())
				logger('probe_url: scrape_feed: Error parsing XML: ' . $feed->error());


			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'],'@'));
				$email = unxmlify($author->get_email());
				if(! $profile && $author->get_link())
					$profile = trim(unxmlify($author->get_link()));
				if(! $vcard['photo']) {
					$rawtags = $feed->get_feed_tags( SIMPLEPIE_NAMESPACE_ATOM_10, 'author');
    				if($rawtags) {
						$elems = $rawtags[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10];
						if((x($elems,'link')) && ($elems['link'][0]['attribs']['']['rel'] === 'photo'))
							$vcard['photo'] = $elems['link'][0]['attribs']['']['href'];
        			}
				}
			}
			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'],'@'));
						$email = unxmlify($author->get_email());
						if(! $profile && $author->get_link())
							$profile = trim(unxmlify($author->get_link()));
					}
					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']) {
						$rawtags = $item->get_item_tags( SIMPLEPIE_NAMESPACE_ATOM_10, 'author');
    					if($rawtags) {
							$elems = $rawtags[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10];
							if((x($elems,'link')) && ($elems['link'][0]['attribs']['']['rel'] === 'photo'))
								$vcard['photo'] = $elems['link'][0]['attribs']['']['href'];
        				}
					}
				}
			}

			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());

			if(strpos($vcard['fn'],'Twitter / ') !== false) {
				$vcard['fn'] = substr($vcard['fn'],strpos($vcard['fn'],'/')+1);
				$vcard['fn'] = trim($vcard['fn']);
			}
			if(! x($vcard,'nick')) {
				$vcard['nick'] = strtolower(notags(unxmlify($vcard['fn'])));
				if(strpos($vcard['nick'],' '))
					$vcard['nick'] = trim(substr($vcard['nick'],0,strpos($vcard['nick'],' ')));
			}
			if(! $network)
				$network = NETWORK_FEED;
			if(! $priority)
				$priority = 2;
		}
	}

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

	if(! $profile)
		$profile = $url;

	// No human could be associated with this link, use the URL as the contact name

	if(($network === NETWORK_FEED) && ($poll) && (! x($vcard,'fn')))
		$vcard['fn'] = $url;

	$vcard['fn'] = notags($vcard['fn']);
	$vcard['nick'] = str_replace(' ','',notags($vcard['nick']));
		
	$result['name'] = $vcard['fn'];
	$result['nick'] = $vcard['nick'];
	$result['url'] = $profile;
	$result['addr'] = $addr;
	$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;
	$result['pubkey'] = $pubkey;

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

	return $result;
}