friendica/include/items.php

<?php

require_once('bbcode.php');

function get_feed_for(&$a, $dfrn_id, $owner_id, $last_update, $direction = 0) {


	// default permissions - anonymous user

	$sql_extra = " 
		AND `allow_cid` = '' 
		AND `allow_gid` = '' 
		AND `deny_cid`  = '' 
		AND `deny_gid`  = '' 
	";

	if(strlen($owner_id) && ! intval($owner_id)) {
		$r = q("SELECT `uid`, `nickname` FROM `user` WHERE `nickname` = '%s' LIMIT 1",
			dbesc($owner_id)
		);
		if(count($r)) {
			$owner_id = $r[0]['uid'];
			$owner_nick = $r[0]['nickname'];
		}
	}

	$r = q("SELECT * FROM `contact` WHERE `self` = 1 AND `uid` = %d LIMIT 1",
		intval($owner_id)
	);
	if(count($r)) {
		$owner = $r[0];
		$owner['nickname'] = $owner_nick;
	}
	else
		killme();

	if($dfrn_id && $dfrn_id != '*') {

		$sql_extra = '';
		switch($direction) {
			case (-1):
				$sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
				$my_id = $dfrn_id;
				break;
			case 0:
				$sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
				$my_id = '1:' . $dfrn_id;
				break;
			case 1:
				$sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
				$my_id = '0:' . $dfrn_id;
				break;
			default:
				return false;
				break; // NOTREACHED
		}

		$r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 AND `contact`.`uid` = %d $sql_extra LIMIT 1",
			intval($owner_id)
		);

		if(! count($r))
			return false;

		$contact = $r[0];
		$groups = init_groups_visitor($contact['id']);

		if(count($groups)) {
			for($x = 0; $x < count($groups); $x ++) 
				$groups[$x] = '<' . intval($groups[$x]) . '>' ;
			$gs = implode('|', $groups);
		}
		else
			$gs = '<<>>' ; // Impossible to match 

		$sql_extra = sprintf(" 
			AND ( `allow_cid` = '' OR     `allow_cid` REGEXP '<%d>' ) 
			AND ( `deny_cid`  = '' OR NOT `deny_cid`  REGEXP '<%d>' ) 
			AND ( `allow_gid` = '' OR     `allow_gid` REGEXP '%s' )
			AND ( `deny_gid`  = '' OR NOT `deny_gid`  REGEXP '%s') 
		",
			intval($contact['id']),
			intval($contact['id']),
			dbesc($gs),
			dbesc($gs)
		);
	}

	if($dfrn_id === '' || $dfrn_id === '*')
		$sort = 'DESC';
	else
		$sort = 'ASC';

	if(! strlen($last_update))
		$last_update = 'now -30 days';

	$check_date = datetime_convert('UTC','UTC',$last_update,'Y-m-d H:i:s');

	$r = q("SELECT `item`.*, `item`.`id` AS `item_id`, 
		`contact`.`name`, `contact`.`photo`, `contact`.`url`, 
		`contact`.`name-date`, `contact`.`uri-date`, `contact`.`avatar-date`,
		`contact`.`thumb`, `contact`.`dfrn-id`, `contact`.`self`, 
		`contact`.`id` AS `contact-id`, `contact`.`uid` AS `contact-uid`
		FROM `item` LEFT JOIN `contact` ON `contact`.`id` = `item`.`contact-id`
		WHERE `item`.`uid` = %d AND `item`.`visible` = 1 
		AND `item`.`wall` = 1 AND `contact`.`blocked` = 0 AND `contact`.`pending` = 0
		AND ( `item`.`edited` > '%s' OR `item`.`changed` > '%s' )
		$sql_extra
		ORDER BY `parent` %s, `created` ASC LIMIT 0, 300",
		intval($owner_id),
		dbesc($check_date),
		dbesc($check_date),
		dbesc($sort)
	);

	// Will check further below if this actually returned results.
	// We will provide an empty feed in any case.

	$items = $r;

	$feed_template = load_view_file('view/atom_feed.tpl');

	$atom = '';

	$hub = get_config('system','huburl');

	$hubxml = '';
	if(strlen($hub)) {
		$hubs = explode(',', $hub);
		if(count($hubs)) {
			foreach($hubs as $h) {
				$h = trim($h);
				if(! strlen($h))
					continue;
				$hubxml .= '<link rel="hub" href="' . xmlify($h) . '" />' . "\n" ;
			}
		}
	}

	$salmon = '<link rel="salmon" href="' . xmlify($a->get_baseurl() . '/salmon/' . $owner_nick) . '" />' . "\n" ; 
	$salmon .= '<link rel="http://salmon-protocol.org/ns/salmon-replies" href="' . xmlify($a->get_baseurl() . '/salmon/' . $owner_nick) . '" />' . "\n" ; 
	$salmon .= '<link rel="http://salmon-protocol.org/ns/salmon-mention" href="' . xmlify($a->get_baseurl() . '/salmon/' . $owner_nick) . '" />' . "\n" ; 


	$atom .= replace_macros($feed_template, array(
		'$feed_id'      => xmlify($a->get_baseurl() . '/profile/' . $owner_nick),
		'$feed_title'   => xmlify($owner['name']),
		'$feed_updated' => xmlify(datetime_convert('UTC', 'UTC', 'now' , ATOM_TIME)) ,
		'$hub'          => $hubxml,
		'$salmon'       => $salmon,
		'$name'         => xmlify($owner['name']),
		'$profile_page' => xmlify($owner['url']),
		'$photo'        => xmlify($owner['photo']),
		'$thumb'        => xmlify($owner['thumb']),
		'$picdate'      => xmlify(datetime_convert('UTC','UTC',$owner['avatar-date'] . '+00:00' , ATOM_TIME)) ,
		'$uridate'      => xmlify(datetime_convert('UTC','UTC',$owner['uri-date']    . '+00:00' , ATOM_TIME)) ,
		'$namdate'      => xmlify(datetime_convert('UTC','UTC',$owner['name-date']   . '+00:00' , ATOM_TIME)) 
	));

	call_hooks('atom_feed', $atom);

	if(! count($items)) {

		call_hooks('atom_feed_end', $atom);

		$atom .= '</feed>' . "\r\n";
		return $atom;
	}

	foreach($items as $item) {

		// public feeds get html, our own nodes use bbcode

		if($dfrn_id === '*') {
			$type = 'html';
		}
		else {
			$type = 'text';
		}

		$atom .= atom_entry($item,$type,null,$owner,true);
	}

	call_hooks('atom_feed_end', $atom);

	$atom .= '</feed>' . "\r\n";

	return $atom;
}


function construct_verb($item) {
	if($item['verb'])
		return $item['verb'];
	return ACTIVITY_POST;
}

function construct_activity_object($item) {

	if($item['object']) {
		$o = '<as:object>' . "\r\n";
		$r = @simplexml_load_string($item['object']);
		if($r->type)
			$o .= '<as:object-type>' . xmlify($r->type) . '</as:object-type>' . "\r\n";
		if($r->id)
			$o .= '<id>' . xmlify($r->id) . '</id>' . "\r\n";
		if($r->title)
			$o .= '<title>' . xmlify($r->title) . '</title>' . "\r\n";
		if($r->link) {
			if(substr($r->link,0,1) === '<') 
				$o .= $r->link;
			else
				$o .= '<link rel="alternate" type="text/html" href="' . xmlify($r->link) . '" />' . "\r\n";
		}
		if($r->content)
			$o .= '<content type="html" >' . xmlify(bbcode($r->content)) . '</content>' . "\r\n";
		$o .= '</as:object>' . "\r\n";
		return $o;
	}

	return '';
} 

function construct_activity_target($item) {

	if($item['target']) {
		$o = '<as:target>' . "\r\n";
		$r = @simplexml_load_string($item['target']);
		if($r->type)
			$o .= '<as:object-type>' . xmlify($r->type) . '</as:object-type>' . "\r\n";
		if($r->id)
			$o .= '<id>' . xmlify($r->id) . '</id>' . "\r\n";
		if($r->title)
			$o .= '<title>' . xmlify($r->title) . '</title>' . "\r\n";
		if($r->link) {
			if(substr($r->link,0,1) === '<') 
				$o .= $r->link;
			else
				$o .= '<link rel="alternate" type="text/html" href="' . xmlify($r->link) . '" />' . "\r\n";
		}
		if($r->content)
			$o .= '<content type="html" >' . xmlify(bbcode($r->content)) . '</content>' . "\r\n";
		$o .= '</as:target>' . "\r\n";
		return $o;
	}

	return '';
} 




function get_atom_elements($feed,$item) {

	require_once('library/HTMLPurifier.auto.php');
	require_once('include/html2bbcode.php');

	$best_photo = array();

	$res = array();

	$author = $item->get_author();
	$res['author-name'] = unxmlify($author->get_name());
	$res['author-link'] = unxmlify($author->get_link());
	$res['uri'] = unxmlify($item->get_id());
	$res['title'] = unxmlify($item->get_title());
	$res['body'] = unxmlify($item->get_content());


	// look for a photo. We should check media size and find the best one,
	// but for now let's just find any author photo

	$rawauthor = $item->get_item_tags(SIMPLEPIE_NAMESPACE_ATOM_10,'author');

	if($rawauthor && $rawauthor[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['link']) {
		$base = $rawauthor[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['link'];
		foreach($base as $link) {
			if(! $res['author-avatar']) {
				if($link['attribs']['']['rel'] === 'photo' || $link['attribs']['']['rel'] === 'avatar')
					$res['author-avatar'] = unxmlify($link['attribs']['']['href']);
			}
		}
	}			

	$rawactor = $item->get_item_tags(NAMESPACE_ACTIVITY, 'actor');

	if($rawactor && activity_match($rawactor[0]['child'][NAMESPACE_ACTIVITY]['object-type'][0]['data'],ACTIVITY_OBJ_PERSON)) {
		$base = $rawactor[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['link'];
		if($base && count($base)) {
			foreach($base as $link) {
				if($link['attribs']['']['rel'] === 'alternate' && (! $res['author-link']))
					$res['author-link'] = unxmlify($link['attribs']['']['href']);
				if(! $res['author-avatar']) {
					if($link['attribs']['']['rel'] === 'avatar' || $link['attribs']['']['rel'] === 'photo')
						$res['author-avatar'] = unxmlify($link['attribs']['']['href']);
				}
			}
		}
	}

	// No photo/profile-link on the item - look at the feed level

	if((! (x($res,'author-link'))) || (! (x($res,'author-avatar')))) {
		$rawauthor = $feed->get_feed_tags(SIMPLEPIE_NAMESPACE_ATOM_10,'author');
		if($rawauthor && $rawauthor[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['link']) {
			$base = $rawauthor[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['link'];
			foreach($base as $link) {
				if($link['attribs']['']['rel'] === 'alternate' && (! $res['author-link']))
					$res['author-link'] = unxmlify($link['attribs']['']['href']);
				if(! $res['author-avatar']) {
					if($link['attribs']['']['rel'] === 'photo' || $link['attribs']['']['rel'] === 'avatar')
						$res['author-avatar'] = unxmlify($link['attribs']['']['href']);
				}
			}
		}			

		$rawactor = $feed->get_feed_tags(NAMESPACE_ACTIVITY, 'subject');

		if($rawactor && activity_match($rawactor[0]['child'][NAMESPACE_ACTIVITY]['object-type'][0]['data'],ACTIVITY_OBJ_PERSON)) {
			$base = $rawactor[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['link'];

			if($base && count($base)) {
				foreach($base as $link) {
					if($link['attribs']['']['rel'] === 'alternate' && (! $res['author-link']))
						$res['author-link'] = unxmlify($link['attribs']['']['href']);
					if(! (x($res,'author-avatar'))) {
						if($link['attribs']['']['rel'] === 'avatar' || $link['attribs']['']['rel'] === 'photo')
							$res['author-avatar'] = unxmlify($link['attribs']['']['href']);
					}
				}
			}
		}
	}


	$maxlen = get_max_import_size();
	if($maxlen && (strlen($res['body']) > $maxlen))
		$res['body'] = substr($res['body'],0, $maxlen);

	// It isn't certain at this point whether our content is plaintext or html and we'd be foolish to trust 
	// the content type. Our own network only emits text normally, though it might have been converted to 
	// html if we used a pubsubhubbub transport. But if we see even one html open tag in our text, we will
	// have to assume it is all html and needs to be purified.

	// It doesn't matter all that much security wise - because before this content is used anywhere, we are 
	// going to escape any tags we find regardless, but this lets us import a limited subset of html from 
	// the wild, by sanitising it and converting supported tags to bbcode before we rip out any remaining 
	// html.


	if(strpos($res['body'],'<')) {

		$res['body'] = preg_replace('#<object[^>]+>.+?' . 'http://www.youtube.com/((?:v|cp)/[A-Za-z0-9\-_=]+).+?</object>#s',
			'[youtube]$1[/youtube]', $res['body']);

		$config = HTMLPurifier_Config::createDefault();
		$config->set('Cache.DefinitionImpl', null);

		// we shouldn't need a whitelist, because the bbcode converter
		// will strip out any unsupported tags.
		// $config->set('HTML.Allowed', 'p,b,a[href],i'); 

		$purifier = new HTMLPurifier($config);
		$res['body'] = $purifier->purify($res['body']);
	}

	
	$res['body'] = html2bbcode($res['body']);


	$allow = $item->get_item_tags(NAMESPACE_DFRN,'comment-allow');
	if($allow && $allow[0]['data'] == 1)
		$res['last-child'] = 1;
	else
		$res['last-child'] = 0;

	$private = $item->get_item_tags(NAMESPACE_DFRN,'private');
	if($private && $private[0]['data'] == 1)
		$res['private'] = 1;
	else
		$res['private'] = 0;

	$rawcreated = $item->get_item_tags(SIMPLEPIE_NAMESPACE_ATOM_10,'published');
	if($rawcreated)
		$res['created'] = unxmlify($rawcreated[0]['data']);

	$rawlocation = $item->get_item_tags(NAMESPACE_DFRN, 'location');
	if($rawlocation)
		$res['location'] = unxmlify($rawlocation[0]['data']);


	$rawedited = $item->get_item_tags(SIMPLEPIE_NAMESPACE_ATOM_10,'updated');
	if($rawedited)
		$res['edited'] = unxmlify($rawcreated[0]['data']);

	$rawowner = $item->get_item_tags(NAMESPACE_DFRN, 'owner');
	if($rawowner[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['name'][0]['data'])
		$res['owner-name'] = unxmlify($rawowner[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['name'][0]['data']);
	elseif($rawowner[0]['child'][NAMESPACE_DFRN]['name'][0]['data'])
		$res['owner-name'] = unxmlify($rawowner[0]['child'][NAMESPACE_DFRN]['name'][0]['data']);
	if($rawowner[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['uri'][0]['data'])
		$res['owner-link'] = unxmlify($rawowner[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['uri'][0]['data']);
	elseif($rawowner[0]['child'][NAMESPACE_DFRN]['uri'][0]['data'])
		$res['owner-link'] = unxmlify($rawowner[0]['child'][NAMESPACE_DFRN]['uri'][0]['data']);

	if($rawowner[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['link']) {
		$base = $rawowner[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['link'];

		foreach($base as $link) {
			if(! $res['owner-avatar']) {
				if($link['attribs']['']['rel'] === 'photo' || $link['attribs']['']['rel'] === 'avatar')			
					$res['owner-avatar'] = unxmlify($link['attribs']['']['href']);
			}
		}
	}

	$rawgeo = $item->get_item_tags(NAMESPACE_GEORSS,'point');
	if($rawgeo)
		$res['coord'] = unxmlify($rawgeo[0]['data']);


	$rawverb = $item->get_item_tags(NAMESPACE_ACTIVITY, 'verb');
	// select between supported verbs
	if($rawverb)
		$res['verb'] = unxmlify($rawverb[0]['data']);

	$rawobj = $item->get_item_tags(NAMESPACE_ACTIVITY, 'object');

	if($rawobj) {
		$res['object'] = '<object>' . "\n";
		if($rawobj[0]['child'][NAMESPACE_ACTIVITY]['object-type'][0]['data']) {
			$res['object-type'] = $rawobj[0]['child'][NAMESPACE_ACTIVITY]['object-type'][0]['data'];
			$res['object'] .= '<type>' . $rawobj[0]['child'][NAMESPACE_ACTIVITY]['object-type'][0]['data'] . '</type>' . "\n";
		}	
		if($rawobj[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['id'][0]['data'])
			$res['object'] .= '<id>' . $rawobj[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['id'][0]['data'] . '</id>' . "\n";
		if($rawobj[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['link'])
			$res['object'] .= '<link>' . encode_rel_links($rawobj[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['link']) . '</link>' . "\n";
		if($rawobj[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['title'][0]['data'])
			$res['object'] .= '<title>' . $rawobj[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['title'][0]['data'] . '</title>' . "\n";
		if($rawobj[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['content'][0]['data']) {
			$body = $rawobj[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['content'][0]['data'];
			if(! $body)
				$body = $rawobj[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['summary'][0]['data'];
			if(strpos($body,'<')) {

				$body = preg_replace('#<object[^>]+>.+?' . 'http://www.youtube.com/((?:v|cp)/[A-Za-z0-9\-_=]+).+?</object>#s',
					'[youtube]$1[/youtube]', $body);

				$config = HTMLPurifier_Config::createDefault();
				$config->set('Cache.DefinitionImpl', null);

				$purifier = new HTMLPurifier($config);
				$body = $purifier->purify($body);
			}

			$body = html2bbcode($body);
			$res['object'] .= '<content>' . $body . '</content>' . "\n";
		}

		$res['object'] .= '</object>' . "\n";
	}

	$rawobj = $item->get_item_tags(NAMESPACE_ACTIVITY, 'target');

	if($rawobj) {
		$res['target'] = '<target>' . "\n";
		if($rawobj[0]['child'][NAMESPACE_ACTIVITY]['object-type'][0]['data']) {
			$res['target'] .= '<type>' . $rawobj[0]['child'][NAMESPACE_ACTIVITY]['object-type'][0]['data'] . '</type>' . "\n";
		}	
		if($rawobj[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['id'][0]['data'])
			$res['target'] .= '<id>' . $rawobj[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['id'][0]['data'] . '</id>' . "\n";

		if($rawobj[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['link'])
			$res['target'] .= '<link>' . encode_rel_links($rawobj[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['link']) . '</link>' . "\n";
		if($rawobj[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['title'][0]['data'])
			$res['target'] .= '<title>' . $rawobj[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['title'][0]['data'] . '</title>' . "\n";
		if($rawobj[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['content'][0]['data']) {
			$body = $rawobj[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['content'][0]['data'];
			if(! $body)
				$body = $rawobj[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['summary'][0]['data'];
			if(strpos($body,'<')) {

				$body = preg_replace('#<object[^>]+>.+?' . 'http://www.youtube.com/((?:v|cp)/[A-Za-z0-9\-_=]+).+?</object>#s',
					'[youtube]$1[/youtube]', $body);

				$config = HTMLPurifier_Config::createDefault();
				$config->set('Cache.DefinitionImpl', null);

				$purifier = new HTMLPurifier($config);
				$body = $purifier->purify($body);
			}

			$body = html2bbcode($body);
			$res['target'] .= '<content>' . $body . '</content>' . "\n";
		}

		$res['target'] .= '</target>' . "\n";
	}

	$arr = array('feed' => $feed, 'item' => $item, 'result' => $res);

	call_hooks('parse_atom', $arr);

	return $res;
}

function encode_rel_links($links) {
	$o = '';
	if(! ((is_array($links)) && (count($links))))
		return $o;
	foreach($links as $link) {
		$o .= '<link ';
		if($link['attribs']['']['rel'])
			$o .= 'rel="' . $link['attribs']['']['rel'] . '" ';
		if($link['attribs']['']['type'])
			$o .= 'type="' . $link['attribs']['']['type'] . '" ';
		if($link['attribs']['']['href'])
			$o .= 'type="' . $link['attribs']['']['href'] . '" ';
		if( (x($link['attribs'],NAMESPACE_MEDIA)) && $link['attribs'][NAMESPACE_MEDIA]['width'])
			$o .= 'media:width="' . $link['attribs'][NAMESPACE_MEDIA]['width'] . '" ';
		if( (x($link['attribs'],NAMESPACE_MEDIA)) && $link['attribs'][NAMESPACE_MEDIA]['height'])
			$o .= 'media:height="' . $link['attribs'][NAMESPACE_MEDIA]['height'] . '" ';
		$o .= ' />' . "\n" ;
	}
	return xmlify($o);
}

function item_store($arr) {

	if($arr['gravity'])
		$arr['gravity'] = intval($arr['gravity']);
	elseif($arr['parent-uri'] == $arr['uri'])
		$arr['gravity'] = 0;
	elseif(activity_match($arr['verb'],ACTIVITY_POST))
		$arr['gravity'] = 6;
	else      
		$arr['gravity'] = 6;   // extensible catchall

	if(! x($arr,'type'))
		$arr['type']      = 'remote';
	$arr['wall']          = ((x($arr,'wall'))          ? intval($arr['wall'])                : 0);
	$arr['uri']           = ((x($arr,'uri'))           ? notags(trim($arr['uri']))           : random_string());
	$arr['author-name']   = ((x($arr,'author-name'))   ? notags(trim($arr['author-name']))   : '');
	$arr['author-link']   = ((x($arr,'author-link'))   ? notags(trim($arr['author-link']))   : '');
	$arr['author-avatar'] = ((x($arr,'author-avatar')) ? notags(trim($arr['author-avatar'])) : '');
	$arr['owner-name']    = ((x($arr,'owner-name'))    ? notags(trim($arr['owner-name']))    : '');
	$arr['owner-link']    = ((x($arr,'owner-link'))    ? notags(trim($arr['owner-link']))    : '');
	$arr['owner-avatar']  = ((x($arr,'owner-avatar'))  ? notags(trim($arr['owner-avatar']))  : '');
	$arr['created']       = ((x($arr,'created') !== false) ? datetime_convert('UTC','UTC',$arr['created']) : datetime_convert());
	$arr['edited']        = ((x($arr,'edited')  !== false) ? datetime_convert('UTC','UTC',$arr['edited'])  : datetime_convert());
	$arr['changed']       = datetime_convert();
	$arr['title']         = ((x($arr,'title'))         ? notags(trim($arr['title']))         : '');
	$arr['location']      = ((x($arr,'location'))      ? notags(trim($arr['location']))      : '');
	$arr['coord']         = ((x($arr,'coord'))         ? notags(trim($arr['coord']))         : '');
	$arr['last-child']    = ((x($arr,'last-child'))    ? intval($arr['last-child'])          : 0 );
	$arr['visible']       = ((x($arr,'visible') !== false) ? intval($arr['visible'])         : 1 );
	$arr['deleted']       = 0;
	$arr['parent-uri']    = ((x($arr,'parent-uri'))    ? notags(trim($arr['parent-uri']))    : '');
	$arr['verb']          = ((x($arr,'verb'))          ? notags(trim($arr['verb']))          : '');
	$arr['object-type']   = ((x($arr,'object-type'))   ? notags(trim($arr['object-type']))   : '');
	$arr['object']        = ((x($arr,'object'))        ? trim($arr['object'])                : '');
	$arr['target-type']   = ((x($arr,'target-type'))   ? notags(trim($arr['target-type']))   : '');
	$arr['target']        = ((x($arr,'target'))        ? trim($arr['target'])                : '');
	$arr['allow_cid']     = ((x($arr,'allow_cid'))     ? trim($arr['allow_cid'])             : '');
	$arr['allow_gid']     = ((x($arr,'allow_gid'))     ? trim($arr['allow_gid'])             : '');
	$arr['deny_cid']      = ((x($arr,'deny_cid'))      ? trim($arr['deny_cid'])              : '');
	$arr['deny_gid']      = ((x($arr,'deny_gid'))      ? trim($arr['deny_gid'])              : '');
	$arr['private']       = ((x($arr,'private'))       ? intval($arr['private'])             : 0 );
	$arr['body']          = ((x($arr,'body'))          ? escape_tags(trim($arr['body']))     : '');

	// The content body has been through a lot of filtering and transport escaping by now. 
	// We don't want to skip any filters, however a side effect of all this filtering 
	// is that ampersands and <> may have been double encoded, depending on which filter chain
	// they came through. 

	$arr['body']          = str_replace(
								array('&amp;amp;','&amp;gt;','&amp;lt;'),
								array('&amp;'    ,'&gt;'    ,'&lt;'),
								$arr['body']
							);



	if($arr['parent-uri'] === $arr['uri']) {
		$parent_id = 0;
		$allow_cid = $arr['allow_cid'];
		$allow_gid = $arr['allow_gid'];
		$deny_cid  = $arr['deny_cid'];
		$deny_gid  = $arr['deny_gid'];
	}
	else { 

		// find the parent and snarf the item id and ACL's

		$r = q("SELECT * FROM `item` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1",
			dbesc($arr['parent-uri']),
			intval($arr['uid'])
		);

		if(count($r)) {

			// is the new message multi-level threaded?
			// even though we don't support it now, preserve the info
			// and re-attach to the conversation parent.

			if($r[0]['uri'] != $r[0]['parent-uri']) {
				$arr['thr-parent'] = $arr['parent-uri'];
				$arr['parent-uri'] = $r[0]['parent-uri'];
			}

			$parent_id = $r[0]['id'];
			$allow_cid = $r[0]['allow_cid'];
			$allow_gid = $r[0]['allow_gid'];
			$deny_cid  = $r[0]['deny_cid'];
			$deny_gid  = $r[0]['deny_gid'];
		}
		else {
			logger('item_store: item parent was not found - ignoring item');
			return 0;
		}
	}

	call_hooks('post_remote',$arr);

	dbesc_array($arr);

	logger('item_store: ' . print_r($arr,true), LOGGER_DATA);

	$r = dbq("INSERT INTO `item` (`" 
			. implode("`, `", array_keys($arr)) 
			. "`) VALUES ('" 
			. implode("', '", array_values($arr)) 
			. "')" );

	// find the item we just created

	$r = q("SELECT `id` FROM `item` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1",
		$arr['uri'],           // already dbesc'd
		intval($arr['uid'])
	);
	if(count($r)) {
		$current_post = $r[0]['id'];
		logger('item_store: created item ' . $current_post);
	}
	else {
		logger('item_store: could not locate created item');
		return 0;
	}

	if($arr['parent-uri'] === $arr['uri'])
		$parent_id = $current_post;
 
	if(strlen($allow_cid) || strlen($allow_gid) || strlen($deny_cid) || strlen($deny_gid))
		$private = 1;
	else
		$private = $arr['private']; 

	// Set parent id - and also make sure to inherit the parent's ACL's.

	$r = q("UPDATE `item` SET `parent` = %d, `allow_cid` = '%s', `allow_gid` = '%s',
		`deny_cid` = '%s', `deny_gid` = '%s', `private` = %d WHERE `id` = %d LIMIT 1",
		intval($parent_id),
		dbesc($allow_cid),
		dbesc($allow_gid),
		dbesc($deny_cid),
		dbesc($deny_gid),
		intval($private),
		intval($current_post)
	);

	return $current_post;
}

function get_item_contact($item,$contacts) {
	if(! count($contacts) || (! is_array($item)))
		return false;
	foreach($contacts as $contact) {
		if($contact['id'] == $item['contact-id']) {
			return $contact;
			break; // NOTREACHED
		}
	}
	return false;
}


function dfrn_deliver($owner,$contact,$atom) {

	$a = get_app();

	if((! strlen($contact['dfrn-id'])) && (! $contact['duplex']) && (! ($owner['page-flags'] == PAGE_COMMUNITY)))
		return 3;

	$idtosend = $orig_id = (($contact['dfrn-id']) ? $contact['dfrn-id'] : $contact['issued-id']);

	if($contact['duplex'] && $contact['dfrn-id'])
		$idtosend = '0:' . $orig_id;
	if($contact['duplex'] && $contact['issued-id'])
		$idtosend = '1:' . $orig_id;		

	$rino = ((function_exists('mcrypt_encrypt')) ? 1 : 0);

	$rino_enable = get_config('system','rino_encrypt');

	if(! $rino_enable)
		$rino = 0;

	$url = $contact['notify'] . '?dfrn_id=' . $idtosend . '&dfrn_version=' . DFRN_PROTOCOL_VERSION . (($rino) ? '&rino=1' : '');

	logger('dfrn_deliver: ' . $url);

	$xml = fetch_url($url);

	$curl_stat = $a->get_curl_code();
	if(! $curl_stat)
		return(-1); // timed out

	logger('dfrn_deliver: ' . $xml);

	if(! $xml)
		return 3;

	$res = simplexml_load_string($xml);

	if((intval($res->status) != 0) || (! strlen($res->challenge)) || (! strlen($res->dfrn_id)))
		return (($res->status) ? $res->status : 3);

	$postvars     = array();
	$sent_dfrn_id = hex2bin($res->dfrn_id);
	$challenge    = hex2bin($res->challenge);
	$rino_allowed = ((intval($res->rino) === 1) ? 1 : 0);

	$final_dfrn_id = '';


	if(($contact['duplex'] && strlen($contact['prvkey'])) || ($owner['page-flags'] == PAGE_COMMUNITY)) {
		openssl_private_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['prvkey']);
		openssl_private_decrypt($challenge,$postvars['challenge'],$contact['prvkey']);
	}
	else {
		openssl_public_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['pubkey']);
		openssl_public_decrypt($challenge,$postvars['challenge'],$contact['pubkey']);
	}

	$final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));

	if(strpos($final_dfrn_id,':') == 1)
		$final_dfrn_id = substr($final_dfrn_id,2);

	if($final_dfrn_id != $orig_id) {
		logger('dfrn_deliver: wrong dfrn_id.');
		// did not decode properly - cannot trust this site 
		return 3;
	}

	$postvars['dfrn_id']      = $idtosend;
	$postvars['dfrn_version'] = DFRN_PROTOCOL_VERSION;

	if(($contact['rel']) && ($contact['rel'] != REL_FAN) && (! $contact['blocked']) && (! $contact['readonly'])) {
		$postvars['data'] = $atom;
	}
	elseif($owner['page-flags'] == PAGE_COMMUNITY) {
		$postvars['data'] = $atom;
	}
	else {
		$postvars['data'] = str_replace('<dfrn:comment-allow>1','<dfrn:comment-allow>0',$atom);
	}

	if($rino && $rino_allowed) {
		$key = substr(random_string(),0,16);
		$data = bin2hex(aes_encrypt($postvars['data'],$key));
		$postvars['data'] = $data;
		logger('rino: sent key = ' . $key);	

		if(($contact['duplex'] && strlen($contact['prvkey'])) || ($owner['page-flags'] == PAGE_COMMUNITY)) {
			openssl_private_encrypt($key,$postvars['key'],$contact['prvkey']);
		}
		else {
			openssl_public_encrypt($key,$postvars['key'],$contact['pubkey']);
		}

		logger('md5 rawkey ' . md5($postvars['key']));

		$postvars['key'] = bin2hex($postvars['key']);
	}

	logger('dfrn_deliver: ' . "SENDING: " . print_r($postvars,true), LOGGER_DATA);

	$xml = post_url($contact['notify'],$postvars);

	logger('dfrn_deliver: ' . "RECEIVED: " . $xml, LOGGER_DATA);

	$curl_stat = $a->get_curl_code();
	if((! $curl_stat) || (! strlen($xml)))
		return(-1); // timed out

	$res = simplexml_load_string($xml);

	return $res->status;
 
}


/*
 *
 * consume_feed - process atom feed and update anything/everything we might need to update
 *
 * $xml = the (atom) feed to consume - no RSS spoken here, it might partially work since simplepie 
 *        handles both, but we don't claim it will work well, and are reasonably certain it won't.
 * $importer = the contact_record (joined to user_record) of the local user who owns this relationship.
 *             It is this person's stuff that is going to be updated.
 * $contact =  the person who is sending us stuff. If not set, we MAY be processing a "follow" activity
 *             from an external network and MAY create an appropriate contact record. Otherwise, we MUST 
 *             have a contact record.
 * $hub = should we find a hub declation in the feed, pass it back to our calling process, who might (or 
 *        might not) try and subscribe to it.
 *
 */

function consume_feed($xml,$importer,$contact, &$hub, $datedir = 0) {

	require_once('simplepie/simplepie.inc');

	$feed = new SimplePie();
	$feed->set_raw_data($xml);
	if($datedir)
		$feed->enable_order_by_date(true);
	else
		$feed->enable_order_by_date(false);
	$feed->init();

	// Check at the feed level for updated contact name and/or photo

	$name_updated  = '';
	$new_name = '';
	$photo_timestamp = '';
	$photo_url = '';


	$hubs = $feed->get_links('hub');

	if(count($hubs))
		$hub = implode(',', $hubs);

	$rawtags = $feed->get_feed_tags( SIMPLEPIE_NAMESPACE_ATOM_10, 'author');
	if($rawtags) {
		$elems = $rawtags[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10];
		if($elems['name'][0]['attribs'][NAMESPACE_DFRN]['updated']) {
			$name_updated = $elems['name'][0]['attribs'][NAMESPACE_DFRN]['updated'];
			$new_name = $elems['name'][0]['data'];
		} 
		if((x($elems,'link')) && ($elems['link'][0]['attribs']['']['rel'] === 'photo') && ($elems['link'][0]['attribs'][NAMESPACE_DFRN]['updated'])) {
			$photo_timestamp = datetime_convert('UTC','UTC',$elems['link'][0]['attribs'][NAMESPACE_DFRN]['updated']);
			$photo_url = $elems['link'][0]['attribs']['']['href'];
		}
	}

	if((is_array($contact)) && ($photo_timestamp) && (strlen($photo_url)) && ($photo_timestamp > $contact['avatar-date'])) {
		logger('Consume feed: Updating photo for ' . $contact['name']);
		require_once("Photo.php");
		$photo_failure = false;
		$have_photo = false;

		$r = q("SELECT `resource-id` FROM `photo` WHERE `contact-id` = %d AND `uid` = %d LIMIT 1",
			intval($contact['id']),
			intval($contact['uid'])
		);
		if(count($r)) {
			$resource_id = $r[0]['resource-id'];
			$have_photo = true;
		}
		else {
			$resource_id = photo_new_resource();
		}
			
		$img_str = fetch_url($photo_url,true);
		$img = new Photo($img_str);
		if($img->is_valid()) {
			if($have_photo) {
				q("DELETE FROM `photo` WHERE `resource-id` = '%s' AND `contact-id` = %d AND `uid` = %d",
					dbesc($resource_id),
					intval($contact['id']),
					intval($contact['uid'])
				);
			}
				
			$img->scaleImageSquare(175);
				
			$hash = $resource_id;
			$r = $img->store($contact['uid'], $contact['id'], $hash, basename($photo_url), t('Contact Photos') , 4);
				
			$img->scaleImage(80);
			$r = $img->store($contact['uid'], $contact['id'], $hash, basename($photo_url), t('Contact Photos') , 5);

			$img->scaleImage(48);
			$r = $img->store($contact['uid'], $contact['id'], $hash, basename($photo_url), t('Contact Photos') , 6);

			$a = get_app();

			q("UPDATE `contact` SET `avatar-date` = '%s', `photo` = '%s', `thumb` = '%s', `micro` = '%s'  
				WHERE `uid` = %d AND `id` = %d LIMIT 1",
				dbesc(datetime_convert()),
				dbesc($a->get_baseurl() . '/photo/' . $hash . '-4.jpg'),
				dbesc($a->get_baseurl() . '/photo/' . $hash . '-5.jpg'),
				dbesc($a->get_baseurl() . '/photo/' . $hash . '-6.jpg'),
				intval($contact['uid']),
				intval($contact['id'])
			);
		}
	}

	if((is_array($contact)) && ($name_updated) && (strlen($new_name)) && ($name_updated > $contact['name-date'])) {
		q("UPDATE `contact` SET `name` = '%s', `name-date` = '%s' WHERE `uid` = %d AND `id` = %d LIMIT 1",
			dbesc(notags(trim($new_name))),
			dbesc(datetime_convert()),
			intval($contact['uid']),
			intval($contact['id'])
		);
	}

	// Now process the feed
	if($feed->get_item_quantity()) {		
        // in inverse date order
		if ($datedir)
			$items = array_reverse($feed->get_items());
		foreach($items as $item) {

			$deleted = false;

			$rawdelete = $item->get_item_tags( NAMESPACE_TOMB, 'deleted-entry');
			if(isset($rawdelete[0]['attribs']['']['ref'])) {
				$uri = $rawthread[0]['attribs']['']['ref'];
				$deleted = true;
				if(isset($rawdelete[0]['attribs']['']['when'])) {
					$when = $rawthread[0]['attribs']['']['when'];
					$when = datetime_convert('UTC','UTC', $when, 'Y-m-d H:i:s');
				}
				else
					$when = datetime_convert('UTC','UTC','now','Y-m-d H:i:s');
			}
			if($deleted && is_array($contact)) {
				$r = q("SELECT * FROM `item` WHERE `uri` = '%s' AND `uid` = %d AND `contact-id` = %d LIMIT 1",
					dbesc($uri),
					intval($importer['uid']),
					intval($contact['id'])
				);
				if(count($r)) {
					$item = $r[0];
					if($item['uri'] == $item['parent-uri']) {
						$r = q("UPDATE `item` SET `deleted` = 1, `edited` = '%s', `changed` = '%s',
							`body` = '', `title` = ''
							WHERE `parent-uri` = '%s' AND `uid` = %d",
							dbesc($when),
							dbesc(datetime_convert()),
							dbesc($item['uri']),
							intval($importer['uid'])
						);
					}
					else {
						$r = q("UPDATE `item` SET `deleted` = 1, `edited` = '%s', `changed` = '%s',
							`body` = '', `title` = '' 
							WHERE `uri` = '%s' AND `uid` = %d LIMIT 1",
							dbesc($when),
							dbesc(datetime_convert()),
							dbesc($uri),
							intval($importer['uid'])
						);
						if($item['last-child']) {
							// ensure that last-child is set in case the comment that had it just got wiped.
							$q("UPDATE `item` SET `last-child` = 0, `changed` = '%s' WHERE `parent-uri` = '%s' AND `uid` = %d ",
								dbesc(datetime_convert()),
								dbesc($item['parent-uri']),
								intval($item['uid'])
							);
							// who is the last child now? 
							$r = q("SELECT `id` FROM `item` WHERE `parent-uri` = '%s' AND `type` != 'activity' AND `deleted` = 0 AND `uid` = %d 
								ORDER BY `created` DESC LIMIT 1",
									dbesc($item['parent-uri']),
									intval($importer['uid'])
							);
							if(count($r)) {
								q("UPDATE `item` SET `last-child` = 1 WHERE `id` = %d LIMIT 1",
									intval($r[0]['id'])
								);
							}
						}	
					}
				}	
				continue;
			}


			$is_reply = false;		
			$item_id = $item->get_id();
			$rawthread = $item->get_item_tags( NAMESPACE_THREAD,'in-reply-to');
			if(isset($rawthread[0]['attribs']['']['ref'])) {
				$is_reply = true;
				$parent_uri = $rawthread[0]['attribs']['']['ref'];
			}


			if(($is_reply) && is_array($contact)) {
	
				// Have we seen it? If not, import it.
	
				$item_id = $item->get_id();
	
				$r = q("SELECT `uid`, `last-child`, `edited` FROM `item` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1",
					dbesc($item_id),
					intval($importer['uid'])
				);
				// FIXME update content if 'updated' changes
				if(count($r)) {
					$allow = $item->get_item_tags( NAMESPACE_DFRN, 'comment-allow');
					if(($allow) && ($allow[0]['data'] != $r[0]['last-child'])) {
						$r = q("UPDATE `item` SET `last-child` = 0, `changed` = '%s' WHERE `parent-uri` = '%s' AND `uid` = %d",
							dbesc(datetime_convert()),
							dbesc($parent_uri),
							intval($importer['uid'])
						);
						$r = q("UPDATE `item` SET `last-child` = %d , `changed` = '%s'  WHERE `uri` = '%s' AND `uid` = %d LIMIT 1",
							intval($allow[0]['data']),
							dbesc(datetime_convert()),
							dbesc($item_id),
							intval($importer['uid'])
						);
					}
					continue;
				}
				$datarray = get_atom_elements($feed,$item);
				if($contact['network'] === 'stat') {
					if(strlen($datarray['title']))
						unset($datarray['title']);
					$r = q("UPDATE `item` SET `last-child` = 0, `changed` = '%s' WHERE `parent-uri` = '%s' AND `uid` = %d",
						dbesc(datetime_convert()),
						dbesc($parent_uri),
						intval($importer['uid'])
					);
					$datarray['last-child'] = 1;
				}
				$datarray['parent-uri'] = $parent_uri;
				$datarray['uid'] = $importer['uid'];
				$datarray['contact-id'] = $contact['id'];
				if((activity_match($datarray['verb'],ACTIVITY_LIKE)) || (activity_match($datarray['verb'],ACTIVITY_DISLIKE))) {
					$datarray['type'] = 'activity';
					$datarray['gravity'] = GRAVITY_LIKE;
				}

				$r = item_store($datarray);
				continue;
			}

			else {
				// Head post of a conversation. Have we seen it? If not, import it.

				$item_id = $item->get_id();
				$r = q("SELECT `uid`, `last-child`, `edited` FROM `item` WHERE `uri` = '%s' AND `uid` = %d LIMIT 1",
					dbesc($item_id),
					intval($importer['uid'])
				);
				if(count($r)) {
					$allow = $item->get_item_tags( NAMESPACE_DFRN, 'comment-allow');
					if($allow && $allow[0]['data'] != $r[0]['last-child']) {
						$r = q("UPDATE `item` SET `last-child` = %d , `changed` = '%s' WHERE `uri` = '%s' AND `uid` = %d LIMIT 1",
							intval($allow[0]['data']),
							dbesc(datetime_convert()),
							dbesc($item_id),
							intval($importer['uid'])
						);
					}
					continue;
				}
				$datarray = get_atom_elements($feed,$item);

				if(activity_match($datarray['verb'],ACTIVITY_FOLLOW)) {
					logger('consume-feed: New follower');
					new_follower($importer,$contact,$datarray,$item);
					return;
				}
				if(activity_match($datarray['verb'],ACTIVITY_UNFOLLOW))  {
					lose_follower($importer,$contact,$datarray,$item);
					return;
				}
				if(! is_array($contact))
					return;

				if($contact['network'] === 'stat') {
					if(strlen($datarray['title']))
						unset($datarray['title']);
					$datarray['last-child'] = 1;
				}

				$datarray['parent-uri'] = $item_id;
				$datarray['uid'] = $importer['uid'];
				$datarray['contact-id'] = $contact['id'];
				$r = item_store($datarray);
				continue;

			}
		}
	}

}

function new_follower($importer,$contact,$datarray,$item) {
	$url = notags(trim($datarray['author-link']));
	$name = notags(trim($datarray['author-name']));
	$photo = notags(trim($datarray['author-avatar']));

	$rawtag = $item->get_item_tags(NAMESPACE_ACTIVITY,'actor');
	if($rawtag && $rawtag[0]['child'][NAMESPACE_POCO]['preferredUsername'][0]['data'])
		$nick = $rawtag[0]['child'][NAMESPACE_POCO]['preferredUsername'][0]['data'];

	if(is_array($contact)) {
		if($contact['network'] == 'stat' && $contact['rel'] == REL_FAN) {
			$r = q("UPDATE `contact` SET `rel` = %d WHERE `id` = %d AND `uid` = %d LIMIT 1",
				intval(REL_BUD),
				intval($contact['id']),
				intval($importer['uid'])
			);
		}

		// send email notification to owner?
	}
	else {
	
		// create contact record - set to readonly

		$r = q("INSERT INTO `contact` ( `uid`, `created`, `url`, `name`, `nick`, `photo`, `network`, `rel`, 
			`blocked`, `readonly`, `pending` )
			VALUES ( %d, '%s', '%s', '%s', '%s', '%s', '%s', %d, 0, 1, 1 ) ",
			intval($importer['uid']),
			dbesc(datetime_convert()),
			dbesc($url),
			dbesc($name),
			dbesc($nick),
			dbesc($photo),
			dbesc('stat'),
			intval(REL_VIP)
		);
		$r = q("SELECT `id` FROM `contact` WHERE `uid` = %d AND `url` = '%s' AND `pending` = 1 AND `rel` = %d LIMIT 1",
				intval($importer['uid']),
				dbesc($url),
				intval(REL_VIP)
		);
		if(count($r))
				$contact_record = $r[0];

		// create notification	
		$hash = random_string();

		if(is_array($contact_record)) {
			$ret = q("INSERT INTO `intro` ( `uid`, `contact-id`, `blocked`, `knowyou`, `hash`, `datetime`)
				VALUES ( %d, %d, 0, 0, '%s', '%s' )",
				intval($importer['uid']),
				intval($contact_record['id']),
				dbesc($hash),
				dbesc(datetime_convert())
			);
		}
		$r = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1",
			intval($importer['uid'])
		);
		if(count($r)) {
			if(($r[0]['notify-flags'] & NOTIFY_INTRO) && ($r[0]['page-flags'] == PAGE_NORMAL)) {
				$email_tpl = load_view_file('view/follow_notify_eml.tpl');
				$email = replace_macros($email_tpl, array(
					'$requestor' => ((strlen($name)) ? $name : t('[Name Withheld]')),
					'$url' => $url,
					'$myname' => $r[0]['username'],
					'$siteurl' => $a->get_baseurl(),
					'$sitename' => $a->config['sitename']
				));
				$res = mail($r[0]['email'], 
					t("You have a new follower at ") . $a->config['sitename'],
					$email,
					'From: ' . t('Administrator') . '@' . $_SERVER['SERVER_NAME'] );
			
			}
		}
	}
}

function lose_follower($importer,$contact,$datarray,$item) {

	if(($contact['rel'] == REL_BUD) || ($contact['rel'] == REL_FAN)) {
		q("UPDATE `contact` SET `rel` = %d WHERE `id` = %d LIMIT 1",
			intval(REL_FAN),
			intval($contact['id'])
		);
	}
	else {
		contact_remove($contact['id']);
	}
}


function subscribe_to_hub($url,$importer,$contact) {

	if(is_array($importer)) {
		$r = q("SELECT `nickname` FROM `user` WHERE `uid` = %d LIMIT 1",
			intval($importer['uid'])
		);
	}
	if(! count($r))
		return;

	$push_url = get_config('system','url') . '/pubsub/' . $r[0]['nickname'] . '/' . $contact['id'];

	// Use a single verify token, even if multiple hubs

	$verify_token = ((strlen($contact['hub-verify'])) ? $contact['hub-verify'] : random_string());

	$params= 'hub.mode=subscribe&hub.callback=' . urlencode($push_url) . '&hub.topic=' . urlencode($contact['poll']) . '&hub.verify=async&hub.verify_token=' . $verify_token;

	logger('subscribe_to_hub: subscribing ' . $contact['name'] . ' to hub ' . $url . ' with verifier ' . $verify_token);

	if(! strlen($contact['hub-verify'])) {
		$r = q("UPDATE `contact` SET `hub-verify` = '%s' WHERE `id` = %d LIMIT 1",
			dbesc($verify_token),
			intval($contact['id'])
		);
	}

	post_url($url,$params);			
	return;

}


function atom_author($tag,$name,$uri,$h,$w,$photo) {
	$o = '';
	if(! $tag)
		return $o;
	$name = xmlify($name);
	$uri = xmlify($uri);
	$h = intval($h);
	$w = intval($w);
	$photo = xmlify($photo);


	$o .= "<$tag>\r\n";
	$o .= "<name>$name</name>\r\n";
	$o .= "<uri>$uri</uri>\r\n";
	$o .= '<link rel="photo"  type="image/jpeg" media:width="' . $w . '" media:height="' . $h . '" href="' . $photo . '" />' . "\r\n";
	$o .= '<link rel="avatar" type="image/jpeg" media:width="' . $w . '" media:height="' . $h . '" href="' . $photo . '" />' . "\r\n";

	call_hooks('atom_author', $o);

	$o .= "</$tag>\r\n";
	return $o;
}

function atom_entry($item,$type,$author,$owner,$comment = false) {

	if($item['deleted'])
		return '<at:deleted-entry ref="' . xmlify($item['uri']) . '" when="' . xmlify(datetime_convert('UTC','UTC',$item['edited'] . '+00:00',ATOM_TIME)) . '" />' . "\r\n";

	$a = get_app();

	$o = "\r\n\r\n<entry>\r\n";

	if(is_array($author))
		$o .= atom_author('author',$author['name'],$author['url'],80,80,$author['thumb']);
	else
		$o .= atom_author('author',$item['name'],$item['url'],80,80,$item['thumb']);
	if(strlen($item['owner-name']))
		$o .= atom_author('dfrn:owner',$item['owner-name'],$item['owner-link'],80,80,$item['owner-avatar']);

	if($item['parent'] != $item['id'])
		$o .= '<thr:in-reply-to ref="' . xmlify($item['parent-uri']) . '" type="text/html" href="' .  xmlify($a->get_baseurl() . '/display/' . $owner['nickname'] . '/' . $item['id']) . '" />' . "\r\n";

	$o .= '<id>' . xmlify($item['uri']) . '</id>' . "\r\n";
	$o .= '<title>' . xmlify($item['title']) . '</title>' . "\r\n";
	$o .= '<published>' . xmlify(datetime_convert('UTC','UTC',$item['created'] . '+00:00',ATOM_TIME)) . '</published>' . "\r\n";
	$o .= '<updated>' . xmlify(datetime_convert('UTC','UTC',$item['edited'] . '+00:00',ATOM_TIME)) . '</updated>' . "\r\n";
	$o .= '<content type="' . $type . '" >' . xmlify(($type === 'html') ? bbcode($item['body']) : $item['body']) . '</content>' . "\r\n";
	$o .= '<link rel="alternate" href="' . xmlify($a->get_baseurl() . '/display/' . $owner['nickname'] . '/' . $item['id']) . '" />' . "\r\n";
	if($comment)
		$o .= '<dfrn:comment-allow>' . intval($item['last-child']) . '</dfrn:comment-allow>' . "\r\n";

	if($item['location']) {
		$o .= '<dfrn:location>' . xmlify($item['location']) . '</dfrn:location>' . "\r\n";
		$o .= '<poco:address><poco:formatted>' . xmlify($item['location']) . '</poco:formatted></poco:address>' . "\r\n";
	}

	if($item['coord'])
		$o .= '<georss:point>' . xmlify($item['coord']) . '</georss:point>' . "\r\n";

	if(($item['private']) || strlen($item['allow_cid']) || strlen($item['allow_gid']) || strlen($item['deny_cid']) || strlen($item['deny_gid']))
		$o .= '<dfrn:private>1</dfrn:private>' . "\r\n";

	$verb = construct_verb($item);
	$o .= '<as:verb>' . xmlify($verb) . '</as:verb>' . "\r\n";
	$actobj = construct_activity_object($item);
	if(strlen($actobj))
		$o .= $actobj;
	$actarg = construct_activity_target($item);
	if(strlen($actarg))
		$o .= $actarg;

	$mentioned = get_mentions($item);
	if($mentioned)
		$o .= $mentioned;
	
	call_hooks('atom_entry', $o);

	$o .= '</entry>' . "\r\n";
	
	return $o;
}