path: root/include/items.php

<?php
/**
 * @file include/items.php
 */

/** @todo deprecated in newer SabreDAV releases Sabre\HTTP\URLUtil */
use Sabre\DAV\URLUtil;

require_once('include/bbcode.php');
require_once('include/oembed.php');
require_once('include/crypto.php');
require_once('include/photo/photo_driver.php');
require_once('include/permissions.php');

/**
 * @brief Collects recipients.
 *
 * @param array $item
 * @param[out] boolean $private_envelope
 * @return array containing the recipients
 */
function collect_recipients($item, &$private_envelope) {

	require_once('include/group.php');

	$private_envelope = ((intval($item['item_private'])) ? true : false);
	$recipients = array();

	if($item['allow_cid'] || $item['allow_gid'] || $item['deny_cid'] || $item['deny_gid']) {

		// it is private

		$allow_people = expand_acl($item['allow_cid']);

		$allow_groups = expand_groups(expand_acl($item['allow_gid']));
		$allow_groups = filter_insecure($item['uid'],$allow_groups);

		$recipients = array_unique(array_merge($allow_people,$allow_groups));

		// if you specifically deny somebody but haven't allowed anybody, we'll allow everybody in your
		// address book minus the denied connections. The post is still private and can't be seen publicly
		// as that would allow the denied person to see the post by logging out.

		if((! $item['allow_cid']) && (! $item['allow_gid'])) {
			$r = q("select * from abook where abook_channel = %d and not (abook_flags & %d)>0 ",
				intval($item['uid']),
				intval(ABOOK_FLAG_SELF|ABOOK_FLAG_PENDING|ABOOK_FLAG_ARCHIVED)
			);

			if($r) {
				foreach($r as $rr) {
					$recipients[] = $rr['abook_xchan'];
				}
			}
		}

		$deny_people  = expand_acl($item['deny_cid']);
		$deny_groups  = expand_groups(expand_acl($item['deny_gid']));

		$deny = array_unique(array_merge($deny_people,$deny_groups));

		// Don't deny anybody if nobody was allowed (e.g. they were all filtered out)
		// That would lead to array_diff doing the wrong thing.
		// This will result in a private post that won't be delivered to anybody.

		if($recipients && $deny)
			$recipients = array_diff($recipients,$deny);
		$private_envelope = true;
	}
	else {

		// if the post is marked private but there are no recipients and public_policy/scope = self,
		// only add the author and owner as recipients. The ACL for the post may live on the hub of
		// a different clone. We need to get the post to that hub.

		// The post may be private by virtue of not being visible to anybody on the internet,
		// but there are no envelope recipients, so set this to false. Delivery is controlled
		// by the directives in $item['public_policy'].

		$private_envelope = false;
		require_once('include/identity.php');
		//$sys = get_sys_channel();

		if(array_key_exists('public_policy',$item) && $item['public_policy'] !== 'self') {
			$r = q("select abook_xchan, xchan_network from abook left join xchan on abook_xchan = xchan_hash where abook_channel = %d and not (abook_flags & %d)>0 ",
				intval($item['uid']),
				intval(ABOOK_FLAG_SELF|ABOOK_FLAG_PENDING|ABOOK_FLAG_ARCHIVED)
			);
			if($r) {

				// filter out restrictive public_policy settings from remote networks
				// which don't have this concept and will treat them as public.

				$policy = substr($item['public_policy'],0,3);
				foreach($r as $rr) {
					switch($policy) {
						case 'net':
						case 'aut':
						case 'sit':
						case 'any':
						case 'con':
							if($rr['xchan_network'] != 'zot')
								break;
						case 'pub':
						case '':
						default:
							$recipients[] = $rr['abook_xchan'];
							break;
					}
				}
			}
// we probably want to check that discovery channel delivery is allowed before uncommenting this.
//			if($policy === 'pub')
//				$recipients[] = $sys['xchan_hash'];
		}
	}

	// This is a somewhat expensive operation but important.
	// Don't send this item to anybody who isn't allowed to see it

	$recipients = check_list_permissions($item['uid'],$recipients,'view_stream');

	// remove any upstream recipients from our list.
	// If it is ourself we'll add it back in a second.
	// This should prevent complex delivery chains from getting overly complex by not
	// sending to anybody who is on our list of those who sent it to us.

	if($item['route']) {
		$route = explode(',',$item['route']);
		if(count($route)) {
			$route = array_unique($route);
			$recipients = array_diff($recipients,$route);
		}
	}

	// add ourself just in case we have nomadic clones that need to get a copy.

	$recipients[] = $item['author_xchan'];
	if($item['owner_xchan'] != $item['author_xchan'])
		$recipients[] = $item['owner_xchan'];

	return $recipients;
}

/**
 * If channel is configured to filter insecure members of privacy groups
 * (those whose networks leak privacy via email notifications or other criteria)
 * remove them from any privacy groups (collections) that were included in a post.
 * They can still be addressed individually.
 * Networks may need to be added or removed from this list as circumstances change.
 *
 * Update: this may need to be the default, which will force people to opt-in to
 * sending stuff privately to insecure platforms.
 *
 * @param int $channel_id
 * @param array $arr
 * @return array containing the sane xchan_hashes
 */
function filter_insecure($channel_id, $arr) {
	$insecure_nets = " and not xchan_network in ('diaspora', 'friendica-over-diaspora') ";

	$ret = array();

	if((! intval(get_pconfig($channel_id, 'system', 'filter_insecure_collections'))) || (! $arr))
		return $arr;

	$str = '';
	foreach($arr as $rr) {
		if(strlen($str))
			$str .= ',';

		$str .= "'" . dbesc($rr) . "'";
	}
	$r = q("select xchan_hash from xchan where xchan_hash in ($str) $insecure_nets");
	if($r) {
		foreach($r as $rr) {
			$ret[] = $rr['xchan_hash'];
		}
	}

	return $ret;
}


function comments_are_now_closed($item) {
	if($item['comments_closed'] !== NULL_DATE) {
		$d = datetime_convert();
		if($d > $item['comments_closed'])
			return true;
	}

	return false;
}

/**
 * @brief
 * 
 * This is a compatibility function primarily for plugins, because 
 * in future hubzilla (and later) DB schemas the definition of a 
 * normal item gets a bit more complicated. 
 *
 */

function is_item_normal($item) {
	return((intval($item['item_restrict'])) ? false : true);
}



/**
 * @brief
 *
 * This function examines the comment_policy attached to an item and decides if the current observer has
 * sufficient privileges to comment. This will normally be called on a remote site where perm_is_allowed()
 * will not be suitable because the post owner does not have a local channel_id.
 * Generally we should look at the item - in particular the author['book_flags'] and see if ABOOK_FLAG_SELF is set.
 * If it is, you should be able to use perm_is_allowed( ... 'post_comments'), and if it isn't you need to call
 * can_comment_on_post()
 * We also check the comments_closed date/time on the item if this is set.
 *
 * @param string $observer_xchan
 * @param array $item
 * @return boolean
 */
function can_comment_on_post($observer_xchan, $item) {

//	logger('can_comment_on_post: comment_policy: ' . $item['comment_policy'], LOGGER_DEBUG);

	if(! $observer_xchan)
		return false;

	if($item['comment_policy'] === 'none')
		return false;

	if(comments_are_now_closed($item))
		return false;

	if($observer_xchan === $item['author_xchan'] || $observer_xchan === $item['owner_xchan'])
		return true;

	switch($item['comment_policy']) {
		case 'self':
			if($observer_xchan === $item['author_xchan'] || $observer_xchan === $item['owner_xchan'])
				return true;
			break;
		case 'public':
			// We don't allow public comments yet, until a policy
			// for dealing with anonymous comments is in place with
			// a means to moderate comments. Until that time, return
			// false.
			return false;
			break;
		case 'any connections':
		case 'contacts':
		case 'authenticated':
		case '':
			if(array_key_exists('owner',$item)) {
				if(($item['owner']['abook_xchan']) && ($item['owner']['abook_their_perms'] & PERMS_W_COMMENT))
					return true;
			}
			break;
		default:
			break;
	}
	if(strstr($item['comment_policy'],'network:') && strstr($item['comment_policy'],'red'))
		return true;
	if(strstr($item['comment_policy'],'site:') && strstr($item['comment_policy'],get_app()->get_hostname()))
		return true;

	return false;
}

/**
 * @brief Adds $hash to the item source route specified by $iid.
 *
 * $item['route'] contains a comma-separated list of xchans that sent the current message,
 * somewhat analogous to the * Received: header line in email. We can use this to perform
 * loop detection and to avoid sending a particular item to any "upstream" sender (they
 * already have a copy because they sent it to us).
 *
 * Modifies item in the database pointed to by $iid.
 *
 * @param integer $iid
 *    item['id'] of target item
 * @param string $hash
 *    xchan_hash of the channel that sent the item
 */
function add_source_route($iid, $hash) {
//	logger('add_source_route ' . $iid . ' ' . $hash, LOGGER_DEBUG);

	if((! $iid) || (! $hash))
		return;

	$r = q("select route from item where id = %d limit 1",
		intval($iid)
	);
	if($r) {
		$new_route = (($r[0]['route']) ? $r[0]['route'] . ',' : '') . $hash;
		q("update item set route = '%s' where id = %d",
			(dbesc($new_route)),
			intval($iid)
		);
	}
}


/**
 * @brief preg_match function when fixing 'naked' links in mod item.php.
 *
 * Check if we've got a hubloc for the site and use a zrl if we do, a url if we don't.
 * Remove any existing zid= param which may have been pasted by mistake - and will have
 * the author's credentials. zid's are dynamic and can't really be passed around like
 * that.
 *
 * @param array $matches
 * @return string
 */
function red_zrl_callback($matches) {
	require_once('include/hubloc.php');
	$zrl = is_matrix_url($matches[2]);

	$t = strip_zids($matches[2]);
	if($t !== $matches[2]) {
		$zrl = true;
		$matches[2] = $t;
	}

	if($matches[1] === '#^')
		$matches[1] = '';
	if($zrl)
		return $matches[1] . '#^[zrl=' . $matches[2] . ']' . $matches[2] . '[/zrl]';

	return $matches[1] . '#^[url=' . $matches[2] . ']' . $matches[2] . '[/url]';
}

/**
 * If we've got a url or zrl tag with a naked url somewhere in the link text,
 * escape it with quotes unless the naked url is a linked photo.
 *
 * @param array $matches
 * @return string
 */
function red_escape_zrl_callback($matches) {

	// Uncertain why the url/zrl forms weren't picked up by the non-greedy regex.

	if((strpos($matches[3], 'zmg') !== false) || (strpos($matches[3], 'img') !== false) || (strpos($matches[3],'zrl') !== false) || (strpos($matches[3],'url') !== false))
		return $matches[0];

	return '[' . $matches[1] . 'rl' . $matches[2] . ']' . $matches[3] . '"' . $matches[4] . '"' . $matches[5] . '[/' . $matches[6] . 'rl]';
}

function red_escape_codeblock($m) {
	return '[$b64' . $m[2] . base64_encode($m[1]) . '[/' . $m[2] . ']';
}

function red_unescape_codeblock($m) {
	return '[' . $m[2] . base64_decode($m[1]) . '[/' . $m[2] . ']';
}


function red_zrlify_img_callback($matches) {
	require_once('include/hubloc.php');
	$zrl = is_matrix_url($matches[2]);

	$t = strip_zids($matches[2]);
	if($t !== $matches[2]) {
		$zrl = true;
		$matches[2] = $t;
	}

	if($zrl)
		return '[zmg' . $matches[1] . ']' . $matches[2] . '[/zmg]';

	return $matches[0];
}


/**
 * @brief Post an activity.
 *
 * In its simplest form one needs only to set $arr['body'] to post a note to the logged in channel's wall.
 * Much more complex activities can be created. Permissions are checked. No filtering, tag expansion
 * or other processing is performed.
 *
 * @param array $arr
 * @returns array
 *  * \e boolean \b success true or false
 *  * \e array \b activity the resulting activity if successful
 */
function post_activity_item($arr) {

	$ret = array('success' => false);

	$is_comment = false;
	if((($arr['parent']) && $arr['parent'] != $arr['id']) || (($arr['parent_mid']) && $arr['parent_mid'] != $arr['mid']))
		$is_comment = true;

	if(! x($arr,'item_flags')) {
		if($is_comment)
			$arr['item_flags'] = ITEM_ORIGIN;
		else
			$arr['item_flags'] = ITEM_ORIGIN | ITEM_WALL | ITEM_THREAD_TOP;
	}

	$channel  = get_app()->get_channel();
	$observer = get_app()->get_observer();

	$arr['aid'] = ((x($arr,'aid')) ? $arr['aid'] : $channel['channel_account_id']);
	$arr['uid'] = ((x($arr,'uid')) ? $arr['uid'] : $channel['channel_id']);

	if(! perm_is_allowed($arr['uid'],$observer['xchan_hash'],(($is_comment) ? 'post_comments' : 'post_wall'))) {
		$ret['message'] = t('Permission denied');
		return $ret;
	}

	$arr['public_policy'] = ((x($_REQUEST,'public_policy')) ? escape_tags($_REQUEST['public_policy']) : map_scope($channel['channel_r_stream'],true));
	if($arr['public_policy'])
		$arr['item_private'] = 1;

	if(! array_key_exists('mimetype',$arr))
		$arr['mimetype'] = 'text/bbcode';

	if(array_key_exists('item_private',$arr) && $arr['item_private']) {

		$arr['body'] = trim(z_input_filter($arr['uid'],$arr['body'],$arr['mimetype']));

		if($channel) {
			if($channel['channel_hash'] === $arr['author_xchan']) {
				$arr['sig'] = base64url_encode(rsa_sign($arr['body'],$channel['channel_prvkey']));
				$arr['item_flags'] = $arr['item_flags'] | ITEM_VERIFIED;
			}
		}

		logger('Encrypting local storage');
		$key = get_config('system','pubkey');
		$arr['item_flags'] = $arr['item_flags'] | ITEM_OBSCURED;
		if($arr['title'])
			$arr['title'] = json_encode(crypto_encapsulate($arr['title'],$key));
		if($arr['body'])
			$arr['body']  = json_encode(crypto_encapsulate($arr['body'],$key));
	}

	$arr['mid']          = ((x($arr,'mid')) ? $arr['mid'] : item_message_id());
	$arr['parent_mid']   = ((x($arr,'parent_mid')) ? $arr['parent_mid'] : $arr['mid']);
	$arr['thr_parent']   = ((x($arr,'thr_parent')) ? $arr['thr_parent'] : $arr['mid']);

	$arr['owner_xchan']  = ((x($arr,'owner_xchan'))  ? $arr['owner_xchan']  : $channel['channel_hash']);
	$arr['author_xchan'] = ((x($arr,'author_xchan')) ? $arr['author_xchan'] : $observer['xchan_hash']);

	$arr['verb']         = ((x($arr,'verb')) ? $arr['verb'] : ACTIVITY_POST);
	$arr['obj_type']     = ((x($arr,'obj_type')) ? $arr['obj_type'] : ACTIVITY_OBJ_NOTE);
	if(($is_comment) && ($arr['obj_type'] === ACTIVITY_OBJ_NOTE))
		$arr['obj_type'] = ACTIVITY_OBJ_COMMENT;

	$arr['allow_cid']    = ((x($arr,'allow_cid')) ? $arr['allow_cid'] : $channel['channel_allow_cid']);
	$arr['allow_gid']    = ((x($arr,'allow_gid')) ? $arr['allow_gid'] : $channel['channel_allow_gid']);
	$arr['deny_cid']     = ((x($arr,'deny_cid')) ? $arr['deny_cid'] : $channel['channel_deny_cid']);
	$arr['deny_gid']     = ((x($arr,'deny_gid')) ? $arr['deny_gid'] : $channel['channel_deny_gid']);

	$arr['comment_policy'] = map_scope($channel['channel_w_comment']);

	if ((! $arr['plink']) && ($arr['item_flags'] & ITEM_THREAD_TOP)) {
		$arr['plink'] = z_root() . '/channel/' . $channel['channel_address'] . '/?f=&mid=' . $arr['mid'];
	}


	// for the benefit of plugins, we will behave as if this is an API call rather than a normal online post

	$_REQUEST['api_source'] = 1;

	call_hooks('post_local',$arr);

	if(x($arr,'cancel')) {
		logger('post_activity_item: post cancelled by plugin.');
		return $ret;
	}

	$post = item_store($arr);
	if($post['success'])
		$post_id = $post['item_id'];

	if($post_id) {
		$arr['id'] = $post_id;
		call_hooks('post_local_end', $arr);
		proc_run('php','include/notifier.php','activity',$post_id);
		$ret['success'] = true;
		$r = q("select * from item where id = %d limit 1",
			intval($post_id)
		);
		if($r)
			$ret['activity'] = $r[0];
	}

	return $ret;
}

/**
 * @brief Generate an Atom feed.
 *
 * @param array $channel
 * @param array $params
 */
function get_public_feed($channel, $params) {

	$type      = 'xml';
	$begin     = NULL_DATE;
	$end       = '';
	$start     = 0;
	$records   = 40;
	$direction = 'desc';
	$pages     = 0;

	if(! $params)
		$params = array();

	$params['type']      = ((x($params,'type'))      ? $params['type']          : 'xml');
	$params['begin']     = ((x($params,'begin'))     ? $params['begin']         : NULL_DATE);
	$params['end']       = ((x($params,'end'))       ? $params['end']           : datetime_convert('UTC','UTC','now'));
	$params['start']     = ((x($params,'start'))     ? $params['start']         : 0);
	$params['records']   = ((x($params,'records'))   ? $params['records']       : 40);
	$params['direction'] = ((x($params,'direction')) ? $params['direction']     : 'desc');
	$params['pages']     = ((x($params,'pages'))     ? intval($params['pages']) : 0);
	$params['top']       = ((x($params,'top'))       ? intval($params['top'])   : 0);

	switch($params['type']) {
		case 'json':
			header("Content-type: application/atom+json");
			break;
		case 'xml':
		default:
			header("Content-type: application/atom+xml");
			break;
	}

	return get_feed_for($channel, get_observer_hash(), $params);
}

/**
 * @brief
 *
 * @param array $channel
 * @param string $observer_hash
 * @param array $params
 * @return string
 */
function get_feed_for($channel, $observer_hash, $params) {

	if(! channel)
		http_status_exit(401);

	if($params['pages']) {
		if(! perm_is_allowed($channel['channel_id'],$observer_hash,'view_pages'))
			http_status_exit(403);
	} else {
		if(! perm_is_allowed($channel['channel_id'],$observer_hash,'view_stream'))
			http_status_exit(403);
	}
	$items = items_fetch(array(
		'wall' => '1',
		'datequery' => $params['begin'],
		'datequery2' => $params['end'],
		'start' => $params['start'],          // FIXME
	 	'records' => $params['records'],      // FIXME
		'direction' => $params['direction'],  // FIXME
		'pages' => $params['pages'],
		'order' => 'post',
		'top'   => $params['top']
		), $channel, $observer_hash, CLIENT_MODE_NORMAL, get_app()->module);
	

	$feed_template = get_markup_template('atom_feed.tpl');

	$atom = '';

	$atom .= replace_macros($feed_template, array(
		'$version'      => xmlify(RED_VERSION),
		'$red'          => xmlify(PLATFORM_NAME),
		'$feed_id'      => xmlify($channel['xchan_url']),
		'$feed_title'   => xmlify($channel['channel_name']),
		'$feed_updated' => xmlify(datetime_convert('UTC', 'UTC', 'now' , ATOM_TIME)) ,
		'$hub'          => '', // feed_hublinks(),
		'$salmon'       => '', // feed_salmonlinks($channel['channel_address']),
		'$name'         => xmlify($channel['channel_name']),
		'$profile_page' => xmlify($channel['xchan_url']),
		'$mimephoto'    => xmlify($channel['xchan_photo_mimetype']),
		'$photo'        => xmlify($channel['xchan_photo_l']),
		'$thumb'        => xmlify($channel['xchan_photo_m']),
		'$picdate'      => '',
		'$uridate'      => '',
		'$namdate'      => '',
		'$birthday'     => '',
		'$community'    => '',
	));

	call_hooks('atom_feed', $atom);

	if($items) {
		$type = 'html';
		foreach($items as $item) {
			if($item['item_private'])
				continue;

			/** @BUG $owner is undefined in this call */
			$atom .= atom_entry($item, $type, null, $owner, true);
		}
	}

	call_hooks('atom_feed_end', $atom);

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

	return $atom;
}

/**
 * @brief
 *
 * @param array $item an associative array with
 *   * \b string \b verb
 * @return string item's verb if set, default ACTIVITY_POST see boot.php
 */
function construct_verb($item) {
	if ($item['verb'])
		return $item['verb'];

	return ACTIVITY_POST;
}

function construct_activity_object($item) {

	if($item['object']) {
		$o = '<as:object>' . "\r\n";
		$r = json_decode($item['object'],false);

		if(! $r)
			return '';
		if($r->type)
			$o .= '<as:obj_type>' . xmlify($r->type) . '</as:obj_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($r->links) {
			/** @FIXME!! */
			if(substr($r->link,0,1) === '<') {
				$r->link = preg_replace('/\<link(.*?)\"\>/','<link$1"/>',$r->link);
				$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";
		$r = json_decode($item['target'],false);
		if(! $r)
			return '';
		if($r->type)
			$o .= '<as:obj_type>' . xmlify($r->type) . '</as:obj_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($r->links) {
			/** @FIXME !!! */
			if(substr($r->link,0,1) === '<') {
				if(strstr($r->link,'&') && (! strstr($r->link,'&amp;')))
					$r->link = str_replace('&','&amp;', $r->link);
				$r->link = preg_replace('/\<link(.*?)\"\>/','<link$1"/>',$r->link);
				$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 '';
}

/**
 * @brief Limit lenght on imported system messages.
 *
 * The purpose of this function is to apply system message length limits to
 * imported messages without including any embedded photos in the length.
 *
 * @param string $body
 * @return string
 */
function limit_body_size($body) {

	$maxlen = get_max_import_size();

	// If the length of the body, including the embedded images, is smaller
	// than the maximum, then don't waste time looking for the images
	if($maxlen && (strlen($body) > $maxlen)) {

		$orig_body = $body;
		$new_body = '';
		$textlen = 0;

		$img_start = strpos($orig_body, '[img');
		$img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
		$img_end = ($img_start !== false ? strpos(substr($orig_body, $img_start), '[/img]') : false);
		while(($img_st_close !== false) && ($img_end !== false)) {

			$img_st_close++; // make it point to AFTER the closing bracket
			$img_end += $img_start;
			$img_end += strlen('[/img]');

			if(! strcmp(substr($orig_body, $img_start + $img_st_close, 5), 'data:')) {
				// This is an embedded image

				if( ($textlen + $img_start) > $maxlen ) {
					if($textlen < $maxlen) {
						logger('limit_body_size: the limit happens before an embedded image', LOGGER_DEBUG);
						$new_body = $new_body . substr($orig_body, 0, $maxlen - $textlen);
						$textlen = $maxlen;
					}
				}
				else {
					$new_body = $new_body . substr($orig_body, 0, $img_start);
					$textlen += $img_start;
				}

				$new_body = $new_body . substr($orig_body, $img_start, $img_end - $img_start);
			}
			else {
				if( ($textlen + $img_end) > $maxlen ) {
					if($textlen < $maxlen) {
						$new_body = $new_body . substr($orig_body, 0, $maxlen - $textlen);
						$textlen = $maxlen;
					}
				}
				else {
					$new_body = $new_body . substr($orig_body, 0, $img_end);
					$textlen += $img_end;
				}
			}
			$orig_body = substr($orig_body, $img_end);

			if($orig_body === false) // in case the body ends on a closing image tag
				$orig_body = '';

			$img_start = strpos($orig_body, '[img');
			$img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
			$img_end = ($img_start !== false ? strpos(substr($orig_body, $img_start), '[/img]') : false);
		}

		if( ($textlen + strlen($orig_body)) > $maxlen) {
			if($textlen < $maxlen) {
				$new_body = $new_body . substr($orig_body, 0, $maxlen - $textlen);
				$textlen = $maxlen;
			}
		}
		else {
			$new_body = $new_body . $orig_body;
			$textlen += strlen($orig_body);
		}

		return $new_body;
	}
	else
		return $body;
}

function title_is_body($title, $body) {

	$title = strip_tags($title);
	$title = trim($title);
	$title = str_replace(array("\n", "\r", "\t", " "), array("","","",""), $title);

	$body = strip_tags($body);
	$body = trim($body);
	$body = str_replace(array("\n", "\r", "\t", " "), array("","","",""), $body);

	if (strlen($title) < strlen($body))
		$body = substr($body, 0, strlen($title));

	if (($title != $body) and (substr($title, -3) == "...")) {
		$pos = strrpos($title, "...");
		if ($pos > 0) {
			$title = substr($title, 0, $pos);
			$body = substr($body, 0, $pos);
		}
	}

	return($title == $body);
}


function get_item_elements($x,$allow_code = false) {


	$arr = array();

	if($allow_code)
		$arr['body'] = $x['body'];
	else
		$arr['body']         = (($x['body']) ? htmlspecialchars($x['body'],ENT_COMPAT,'UTF-8',false) : '');

	$key = get_config('system','pubkey');

	$maxlen = get_max_import_size();

	if($maxlen && mb_strlen($arr['body']) > $maxlen) {
		$arr['body'] = mb_substr($arr['body'],0,$maxlen,'UTF-8');
		logger('get_item_elements: message length exceeds max_import_size: truncated');
	}

	$arr['created']      = datetime_convert('UTC','UTC',$x['created']);
	$arr['edited']       = datetime_convert('UTC','UTC',$x['edited']);

	if($arr['created'] > datetime_convert())
		$arr['created']  = datetime_convert();
	if($arr['edited'] > datetime_convert())
		$arr['edited']   = datetime_convert();

	$arr['expires']      = ((x($x,'expires') && $x['expires'])
								? datetime_convert('UTC','UTC',$x['expires'])
								: NULL_DATE);

	$arr['commented']    = ((x($x,'commented') && $x['commented'])
								? datetime_convert('UTC','UTC',$x['commented'])
								: $arr['created']);
	$arr['comments_closed']    = ((x($x,'comments_closed') && $x['comments_closed'])
								? datetime_convert('UTC','UTC',$x['comments_closed'])
								: NULL_DATE);

	$arr['title']        = (($x['title'])          ? htmlspecialchars($x['title'],          ENT_COMPAT,'UTF-8',false) : '');

	if(mb_strlen($arr['title']) > 255)
		$arr['title'] = mb_substr($arr['title'],0,255);


	$arr['app']          = (($x['app'])            ? htmlspecialchars($x['app'],            ENT_COMPAT,'UTF-8',false) : '');
	$arr['route']        = (($x['route'])          ? htmlspecialchars($x['route'],          ENT_COMPAT,'UTF-8',false) : '');
	$arr['mid']          = (($x['message_id'])     ? htmlspecialchars($x['message_id'],     ENT_COMPAT,'UTF-8',false) : '');
	$arr['parent_mid']   = (($x['message_top'])    ? htmlspecialchars($x['message_top'],    ENT_COMPAT,'UTF-8',false) : '');
	$arr['thr_parent']   = (($x['message_parent']) ? htmlspecialchars($x['message_parent'], ENT_COMPAT,'UTF-8',false) : '');

	$arr['plink']        = (($x['permalink'])      ? htmlspecialchars($x['permalink'],      ENT_COMPAT,'UTF-8',false) : '');
	$arr['location']     = (($x['location'])       ? htmlspecialchars($x['location'],       ENT_COMPAT,'UTF-8',false) : '');
	$arr['coord']        = (($x['longlat'])        ? htmlspecialchars($x['longlat'],        ENT_COMPAT,'UTF-8',false) : '');
	$arr['verb']         = (($x['verb'])           ? htmlspecialchars($x['verb'],           ENT_COMPAT,'UTF-8',false) : '');
	$arr['mimetype']     = (($x['mimetype'])       ? htmlspecialchars($x['mimetype'],       ENT_COMPAT,'UTF-8',false) : '');
	$arr['obj_type']     = (($x['object_type'])    ? htmlspecialchars($x['object_type'],    ENT_COMPAT,'UTF-8',false) : '');
	$arr['tgt_type']     = (($x['target_type'])    ? htmlspecialchars($x['target_type'],    ENT_COMPAT,'UTF-8',false) : '');

	$arr['public_policy'] = (($x['public_scope']) ? htmlspecialchars($x['public_scope'], ENT_COMPAT,'UTF-8',false) : '');
	if($arr['public_policy'] === 'public')
		$arr['public_policy'] = '';

	$arr['comment_policy'] = (($x['comment_scope']) ? htmlspecialchars($x['comment_scope'], ENT_COMPAT,'UTF-8',false) : 'contacts');

	$arr['sig']          = (($x['signature']) ? htmlspecialchars($x['signature'],  ENT_COMPAT,'UTF-8',false) : '');

	if(array_key_exists('diaspora_signature',$x) && is_array($x['diaspora_signature']))
		$x['diaspora_signature'] = json_encode($x['diaspora_signature']);

	$arr['diaspora_meta'] = (($x['diaspora_signature']) ? json_encode(crypto_encapsulate($x['diaspora_signature'],$key)) : '');
	$arr['object']       = activity_sanitise($x['object']);
	$arr['target']       = activity_sanitise($x['target']);

	$arr['attach']       = activity_sanitise($x['attach']);
	$arr['term']         = decode_tags($x['tags']);

	$arr['item_private'] = ((array_key_exists('flags',$x) && is_array($x['flags']) && in_array('private',$x['flags'])) ? 1 : 0);

	$arr['item_flags'] = 0;

	if(array_key_exists('flags',$x) && in_array('consensus',$x['flags']))
		$arr['item_flags'] |= ITEM_CONSENSUS;
	if(array_key_exists('flags',$x) && in_array('deleted',$x['flags']))
		$arr['item_restrict'] |= ITEM_DELETED;
	if(array_key_exists('flags',$x) && in_array('hidden',$x['flags']))
		$arr['item_restrict'] |= ITEM_HIDDEN;

	// Here's the deal - the site might be down or whatever but if there's a new person you've never
	// seen before sending stuff to your stream, we MUST be able to look them up and import their data from their
	// hub and verify that they are legit - or else we're going to toss the post. We only need to do this
	// once, and after that your hub knows them. Sure some info is in the post, but it's only a transit identifier
	// and not enough info to be able to look you up from your hash - which is the only thing stored with the post.

	if(($xchan_hash = import_author_xchan($x['author'])) !== false)
		$arr['author_xchan'] = $xchan_hash;
	else
		return array();

	// save a potentially expensive lookup if author == owner
	if($arr['author_xchan'] === make_xchan_hash($x['owner']['guid'],$x['owner']['guid_sig']))
		$arr['owner_xchan'] = $arr['author_xchan'];
	else {
		if(($xchan_hash = import_author_xchan($x['owner'])) !== false)
			$arr['owner_xchan'] = $xchan_hash;
		else
			return array();
	}

	if($arr['sig']) {
		$r = q("select xchan_pubkey from xchan where xchan_hash = '%s' limit 1",
			dbesc($arr['author_xchan'])
		);
		if($r && rsa_verify($x['body'],base64url_decode($arr['sig']),$r[0]['xchan_pubkey']))
			$arr['item_flags'] |= ITEM_VERIFIED;
		else
			logger('get_item_elements: message verification failed.');
	}

	// if it's a private post, encrypt it in the DB.
	// We have to do that here because we need to cleanse the input and prevent bad stuff from getting in,
	// and we need plaintext to do that.


	if(intval($arr['item_private'])) {
		$arr['item_flags'] = $arr['item_flags'] | ITEM_OBSCURED;
		if($arr['title'])
			$arr['title'] = json_encode(crypto_encapsulate($arr['title'],$key));
		if($arr['body'])
			$arr['body']  = json_encode(crypto_encapsulate($arr['body'],$key));
	}


	if(array_key_exists('revision',$x)) {
		// extended export encoding

		$arr['revision'] = $x['revision'];
		$arr['allow_cid'] = $x['allow_cid'];
		$arr['allow_gid'] = $x['allow_gid'];
		$arr['deny_cid'] = $x['deny_cid'];
		$arr['deny_gid'] = $x['deny_gid'];
		$arr['layout_mid'] = $x['layout_mid'];
		$arr['postopts'] = $x['postopts'];
		$arr['resource_id'] = $x['resource_id'];
		$arr['resource_type'] = $x['resource_type'];
		$arr['attach'] = $x['attach'];

		if(! array_key_exists('item_origin',$x)) {
			$arr['item_restrict'] = $x['item_restrict'];
			$arr['item_flags'] = $x['item_flags'];
		}

		if(array_key_exists('item_origin',$x) && intval($x['item_origin']))
			$arr['item_flags'] |= ITEM_ORIGIN;
		if(array_key_exists('item_unseen',$x) && intval($x['item_unseen']))
			$arr['item_flags'] |= ITEM_UNSEEN;
		if(array_key_exists('item_starred',$x) && intval($x['item_starred']))
			$arr['item_flags'] |= ITEM_STARRED;
		if(array_key_exists('item_uplink',$x) && intval($x['item_uplink']))
			$arr['item_flags'] |= ITEM_UPLINK;
		if(array_key_exists('item_consensus',$x) && intval($x['item_consensus']))
			$arr['item_flags'] |= ITEM_CONSENSUS;
		if(array_key_exists('item_wall',$x) && intval($x['item_wall']))
			$arr['item_flags'] |= ITEM_WALL;
		if(array_key_exists('item_thread_top',$x) && intval($x['item_thread_top']))
			$arr['item_flags'] |= ITEM_THREAD_TOP;
		if(array_key_exists('item_notshown',$x) && intval($x['item_notshown']))
			$arr['item_flags'] |= ITEM_NOTSHOWN;
		if(array_key_exists('item_nsfw',$x) && intval($x['item_nsfw']))
			$arr['item_flags'] |= ITEM_NSFW;
		if(array_key_exists('item_mentionsme',$x) && intval($x['item_mentionsme']))
			$arr['item_flags'] |= ITEM_MENTIONSME;
		if(array_key_exists('item_nocomment',$x) && intval($x['item_nocomment']))
			$arr['item_flags'] |= ITEM_NOCOMMENT;
		if(array_key_exists('item_retained',$x) && intval($x['item_retained']))
			$arr['item_flags'] |= ITEM_RETAINED;
		if(array_key_exists('item_rss',$x) && intval($x['item_rss']))
			$arr['item_flags'] |= ITEM_RSS;


		if(array_key_exists('item_deleted',$x)&& intval($x['item_deleted']))
			$arr['item_restrict'] |= ITEM_DELETED;
		if(array_key_exists('item_unpublished',$x)&& intval($x['item_unpublished']))
			$arr['item_restrict'] |= ITEM_UNPUBLISHED;
		if(array_key_exists('item_delayed',$x)&& intval($x['item_delayed']))
			$arr['item_restrict'] |= ITEM_DELAYED_PUBLISH;
		if(array_key_exists('item_pending_remove',$x)&& intval($x['item_pending_remove']))
			$arr['item_restrict'] |= ITEM_PENDING_REMOVE;
		if(array_key_exists('item_type',$x)) {
			switch(intval($x['item_type'])) {
				case 1:
					$arr['item_restrict'] |= ITEM_BUILDBLOCK;
					break;
				case 2:
					$arr['item_restrict'] |= ITEM_PDL;
					break;
				case 3:
					$arr['item_restrict'] |= ITEM_WEBPAGE;
					break;
				case 4:
					$arr['item_restrict'] |= ITEM_BUG;
					break;
				case 0:
				default:
					break;
			}
		}
	}

	return $arr;
}


function import_author_xchan($x) {

	$arr = array('xchan' => $x, 'xchan_hash' => '');
	call_hooks('import_author_xchan',$arr);
	if($arr['xchan_hash'])
		return $arr['xchan_hash'];

	if((! array_key_exists('network', $x)) || ($x['network'] === 'zot')) {
		$y = import_author_zot($x);
	}
	if(! $y)
		$y = import_author_diaspora($x);

	if($x['network'] === 'rss') {
		$y = import_author_rss($x);
	}

	if($x['network'] === 'unknown') {
		$y = import_author_unknown($x);
	}

	return(($y) ? $y : false);
}

/**
 * @brief Imports an author from Diaspora.
 *
 * @param array $x an associative array with
 *   * \e string \b address
 * @return boolean|string false on error, otherwise xchan_hash of the new entry
 */
function import_author_diaspora($x) {
	if(! $x['address'])
		return false;

	$r = q("select * from xchan where xchan_addr = '%s' limit 1",
		dbesc($x['address'])
	);
	if($r) {
		logger('in_cache: ' . $x['address'], LOGGER_DATA);
		return $r[0]['xchan_hash'];
	}

	if(discover_by_webbie($x['address'])) {
		$r = q("select xchan_hash from xchan where xchan_addr = '%s' limit 1",
			dbesc($x['address'])
		);
		if($r)
			return $r[0]['xchan_hash'];
	}

	return false;
}

/**
 * @brief Imports an author from a RSS feed.
 *
 * @param array $x an associative array with
 *   * \e string \b url
 *   * \e string \b name
 *   * \e string \b guid
 * @return boolean|string
 */
function import_author_rss($x) {
	if(! $x['url'])
		return false;

	$r = q("select xchan_hash from xchan where xchan_network = 'rss' and xchan_url = '%s' limit 1",
		dbesc($x['url'])
	);
	if($r) {
		logger('import_author_rss: in cache' , LOGGER_DEBUG);
		return $r[0]['xchan_hash'];
	}
	$name = trim($x['name']);

	$r = q("insert into xchan ( xchan_hash, xchan_guid, xchan_url, xchan_name, xchan_network )
		values ( '%s', '%s', '%s', '%s', '%s' )",
		dbesc($x['guid']),
		dbesc($x['guid']),
		dbesc($x['url']),
		dbesc(($name) ? $name : t('(Unknown)')),
		dbesc('rss')
	);

	if($r && $x['photo']) {

		$photos = import_profile_photo($x['photo']['src'],$x['url']);

		if($photos) {
			/** @bug $arr is undefined in this SQL query */
			$r = q("update xchan set xchan_photo_date = '%s', xchan_photo_l = '%s', xchan_photo_m = '%s', xchan_photo_s = '%s', xchan_photo_mimetype = '%s' where xchan_url = '%s' and xchan_network = 'rss'",
				dbesc(datetime_convert('UTC', 'UTC', $arr['photo_updated'])),
				dbesc($photos[0]),
				dbesc($photos[1]),
				dbesc($photos[2]),
				dbesc($photos[3]),
				dbesc($x['url'])
			);
			if($r)
				return $x['url'];
		}
	}

	return false;
}

function import_author_unknown($x) {

	if(! $x['url'])
		return false;

	$r = q("select xchan_hash from xchan where xchan_network = 'unknown' and xchan_url = '%s' limit 1",
		dbesc($x['url'])
	);
	if($r) {
		logger('import_author_unknown: in cache' , LOGGER_DEBUG);
		return $r[0]['xchan_hash'];
	}

	$name = trim($x['name']);

	$r = q("insert into xchan ( xchan_hash, xchan_guid, xchan_url, xchan_name, xchan_network )
		values ( '%s', '%s', '%s', '%s', '%s' )",
		dbesc($x['url']),
		dbesc($x['url']),
		dbesc($x['url']),
		dbesc(($name) ? $name : t('(Unknown)')),
		dbesc('unknown')
	);
	if($r && $x['photo']) {

		$photos = import_profile_photo($x['photo']['src'],$x['url']);

		if($photos) {
			/** @bug $arr is undefined in this SQL query */
			$r = q("update xchan set xchan_photo_date = '%s', xchan_photo_l = '%s', xchan_photo_m = '%s', xchan_photo_s = '%s', xchan_photo_mimetype = '%s' where xchan_url = '%s' and xchan_network = 'unknown'",
				dbesc(datetime_convert('UTC','UTC',$arr['photo_updated'])),
				dbesc($photos[0]),
				dbesc($photos[1]),
				dbesc($photos[2]),
				dbesc($photos[3]),
				dbesc($x['url'])
			);
			if($r)
				return $x['url'];
		}
	}

	return false;
}

function encode_item($item,$mirror = false) {
	$x = array();
	$x['type'] = 'activity';
	$x['encoding'] = 'zot';

//	logger('encode_item: ' . print_r($item,true));

	$r = q("select channel_r_stream, channel_w_comment from channel where channel_id = %d limit 1",
		intval($item['uid'])
	);

	if($r)
		$comment_scope = $r[0]['channel_w_comment'];
	else
		$comment_scope = 0;

	$scope = $item['public_policy'];
	if(! $scope)
		$scope = 'public';

	$c_scope = map_scope($comment_scope);

	$key = get_config('system','prvkey');

	if(array_key_exists('item_flags',$item) && ($item['item_flags'] & ITEM_OBSCURED)) {
		if($item['title'])
			$item['title'] = crypto_unencapsulate(json_decode_plus($item['title']),$key);
		if($item['body'])
			$item['body'] = crypto_unencapsulate(json_decode_plus($item['body']),$key);
	}

	// If we're trying to backup an item so that it's recoverable or for export/imprt,
	// add all the attributes we need to recover it

	if($mirror) {
		$x['id'] = $item['id'];
		$x['parent'] = $item['parent'];
		$x['uid'] = $item['uid'];
		$x['allow_cid'] = $item['allow_cid'];
		$x['allow_gid'] = $item['allow_gid'];
		$x['deny_cid'] = $item['deny_cid'];
		$x['deny_gid'] = $item['deny_gid'];
		$x['revision'] = $item['revision'];
		$x['layout_mid'] = $item['layout_mid'];
		$x['postopts'] = $item['postopts'];
		$x['resource_id'] = $item['resource_id'];
		$x['resource_type'] = $item['resource_type'];
		$x['item_restrict'] = $item['item_restrict'];
		$x['item_flags'] = $item['item_flags'];
		$x['item_unseen'] = $item['item_unseen'];
		$x['attach'] = $item['attach'];
		if(array_key_exists('item_starred',$item) && intval($item['item_starred']))
			$x['item_flags'] |= ITEM_STARRED;
		if(array_key_exists('item_uplink',$item) && intval($item['item_uplink']))
			$x['item_flags'] |= ITEM_UPLINK;
		if(array_key_exists('item_consensus',$item) && intval($item['item_consensus']))
			$x['item_flags'] |= ITEM_CONSENSUS;
		if(array_key_exists('item_wall',$item) && intval($item['item_wall']))
			$x['item_flags'] |= ITEM_WALL;
		if(array_key_exists('item_thread_top',$item) && intval($item['item_thread_top']))
			$x['item_flags'] |= ITEM_THREAD_TOP;
		if(array_key_exists('item_notshown',$item) && intval($item['item_notshown']))
			$x['item_flags'] |= ITEM_NOTSHOWN;
		if(array_key_exists('item_nsfw',$item) && intval($item['item_nsfw']))
			$x['item_flags'] |= ITEM_NSFW;
		if(array_key_exists('item_mentionsme',$item) && intval($item['item_mentionsme']))
			$x['item_flags'] |= ITEM_MENTIONSME;
		if(array_key_exists('item_nocomment',$item) && intval($item['item_nocomment']))
			$x['item_flags'] |= ITEM_NOCOMMENT;
		if(array_key_exists('item_retained',$item) && intval($item['item_retained']))
			$x['item_flags'] |= ITEM_RETAINED;
		if(array_key_exists('item_rss',$item) && intval($item['item_rss']))
			$x['item_flags'] |= ITEM_RSS;
		if(array_key_exists('item_deleted',$item) && intval($item['item_deleted']))
			$x['item_restrict'] |= ITEM_DELETED;
		if(array_key_exists('item_hidden',$item) && intval($item['item_hidden']))
			$x['item_restrict'] |= ITEM_HIDDEN;
		if(array_key_exists('item_unpublished',$item) && intval($item['item_unpublished']))
			$x['item_restrict'] |= ITEM_UNPUBLISHED;
		if(array_key_exists('item_delayed',$item) && intval($item['item_delayed']))
			$x['item_restrict'] |= ITEM_DELAYED_PUBLISH;
		if(array_key_exists('item_pending_remove',$item) && intval($item['item_pending_remove']))
			$x['item_restrict'] |= ITEM_PENDING_REMOVE;
		if(array_key_exists('item_blocked',$item) && intval($item['item_blocked']))
			$x['item_flags'] |= ITEM_BLOCKED;
		if(array_key_exists('item_',$item) && intval($item['item_']))
			$x['item_flags'] |= ITEM_;
		if(array_key_exists('item_type',$item) && intval($item['item_type'])) {
			switch(intval($item['item_type'])) {
				case 1:
					$x['item_restrict'] |= ITEM_BUILDBLOCK;
					break;
				case 2:
					$x['item_restrict'] |= ITEM_PDL;
					break;
				case 3:
					$x['item_restrict'] |= ITEM_WEBPAGE;
					break;
				case 4:
					$x['item_restrict'] |= ITEM_BUG;
					break;
				case 5:
					$x['item_restrict'] |= ITEM_DOC;
					break;
				default:
					break;
			}
		}
	}


	$x['message_id']      = $item['mid'];
	$x['message_top']     = $item['parent_mid'];
	$x['message_parent']  = $item['thr_parent'];
	$x['created']         = $item['created'];
	$x['edited']          = $item['edited'];
	// always send 0's over the wire
	$x['expires']         = (($item['expires'] == '0001-01-01 00:00:00') ? '0000-00-00 00:00:00' : $item['expires']);
	$x['commented']       = $item['commented'];
	$x['mimetype']        = $item['mimetype'];
	$x['title']           = $item['title'];
	$x['body']            = $item['body'];
	$x['app']             = $item['app'];
	$x['verb']            = $item['verb'];
	$x['object_type']     = $item['obj_type'];
	$x['target_type']     = $item['tgt_type'];
	$x['permalink']       = $item['plink'];
	$x['location']        = $item['location'];
	$x['longlat']         = $item['coord'];
	$x['signature']       = $item['sig'];
	$x['route']           = $item['route'];

	$x['owner']           = encode_item_xchan($item['owner']);
	$x['author']          = encode_item_xchan($item['author']);
	if($item['object'])
		$x['object']      = json_decode_plus($item['object']);
	if($item['target'])
		$x['target']      = json_decode_plus($item['target']);
	if($item['attach'])
		$x['attach']      = json_decode_plus($item['attach']);
	if($y = encode_item_flags($item))
		$x['flags']       = $y;

	if($item['comments_closed'] !== NULL_DATE)
		$x['comments_closed'] = $item['comments_closed'];

	$x['public_scope']    = $scope;

	if($item['item_flags'] & ITEM_NOCOMMENT)
		$x['comment_scope'] = 'none';
	else
		$x['comment_scope'] = $c_scope;

	if($item['term'])
		$x['tags']        = encode_item_terms($item['term'],$mirror);

	if($item['diaspora_meta'])
		$x['diaspora_signature'] = crypto_unencapsulate(json_decode($item['diaspora_meta'],true),$key);

	logger('encode_item: ' . print_r($x,true), LOGGER_DATA);

	return $x;
}

/**
 * @brief
 *
 * @param int $scope
 * @param boolean $strip (optional) default false
 * @return string
 */
function map_scope($scope, $strip = false) {
	switch($scope) {
		case 0:
			return 'self';
		case PERMS_PUBLIC:
			if($strip)
				return '';
			return 'public';
		case PERMS_NETWORK:
			return 'network: red';
		case PERMS_AUTHED:
			return 'authenticated';
		case PERMS_SITE:
			return 'site: ' . get_app()->get_hostname();
		case PERMS_PENDING:
			return 'any connections';
		case PERMS_CONTACTS:
		default:
			return 'contacts';
	}
}

/**
 * @brief Returns a descriptive text for a given $scope.
 *
 * @param string $scope
 * @return string translated string describing the scope
 */
function translate_scope($scope) {
	if(! $scope || $scope === 'public')
		return t('Visible to anybody on the internet.');
	if(strpos($scope,'self') === 0)
		return t('Visible to you only.');
	if(strpos($scope,'network:') === 0)
		return t('Visible to anybody in this network.');
	if(strpos($scope,'authenticated') === 0)
		return t('Visible to anybody authenticated.');
	if(strpos($scope,'site:') === 0)
		return sprintf( t('Visible to anybody on %s.'), strip_tags(substr($scope,6)));
	if(strpos($scope,'any connections') === 0)
		return t('Visible to all connections.');
	if(strpos($scope,'contacts') === 0)
		return t('Visible to approved connections.');
	if(strpos($scope,'specific') === 0)
		return t('Visible to specific connections.');
}

/**
 * @brief
 *
 * @param array $xchan
 * @return array an associative array
 */
function encode_item_xchan($xchan) {
	$ret = array();

	$ret['name']     = $xchan['xchan_name'];
	$ret['address']  = $xchan['xchan_addr'];
	$ret['url']      = (($xchan['hubloc_url']) ? $xchan['hubloc_url'] : $xchan['xchan_url']);
	$ret['network']  = $xchan['xchan_network'];
	$ret['photo']    = array('mimetype' => $xchan['xchan_photo_mimetype'], 'src' => $xchan['xchan_photo_m']);
	$ret['guid']     = $xchan['xchan_guid'];
	$ret['guid_sig'] = $xchan['xchan_guid_sig'];

	return $ret;
}

function encode_item_terms($terms) {
	$ret = array();

	$allowed_export_terms = array( TERM_UNKNOWN, TERM_HASHTAG, TERM_MENTION, TERM_CATEGORY, TERM_BOOKMARK );

	if($mirror) {
		$allowed_export_terms[] = TERM_PCATEGORY;
		$allowed_export_terms[] = TERM_FILE;
	}

	if($terms) {
		foreach($terms as $term) {
			if(in_array($term['type'],$allowed_export_terms))
				$ret[] = array('tag' => $term['term'], 'url' => $term['url'], 'type' => termtype($term['type']));
		}
	}

	return $ret;
}

/**
 * @brief
 *
 * @param int $t
 * @return string
 */
function termtype($t) {
	$types = array('unknown','hashtag','mention','category','private_category','file','search','thing','bookmark');

	return(($types[$t]) ? $types[$t] : 'unknown');
}

/**
 * @brief
 *
 * @param array $t
 * @return array|string empty string or array containing associative arrays with
 *   * \e string \b term
 *   * \e string \b url
 *   * \e int \b type
 */
function decode_tags($t) {
	if($t) {
		$ret = array();
		foreach($t as $x) {
			$tag = array();
			$tag['term'] = htmlspecialchars($x['tag'], ENT_COMPAT, 'UTF-8', false);
			$tag['url']  = htmlspecialchars($x['url'], ENT_COMPAT, 'UTF-8', false);
			switch($x['type']) {
				case 'hashtag':
					$tag['type'] = TERM_HASHTAG;
					break;
				case 'mention':
					$tag['type'] = TERM_MENTION;
					break;
				case 'category':
					$tag['type'] = TERM_CATEGORY;
					break;
				case 'private_category':
					$tag['type'] = TERM_PCATEGORY;
					break;
				case 'file':
					$tag['type'] = TERM_FILE;
					break;
				case 'search':
					$tag['type'] = TERM_SEARCH;
					break;
				case 'thing':
					$tag['type'] = TERM_THING;
					break;
				case 'bookmark':
					$tag['type'] = TERM_BOOKMARK;
					break;
				default:
				case 'unknown':
					$tag['type'] = TERM_UNKNOWN;
					break;
			}
			$ret[] = $tag;
		}

		return $ret;
	}

	return '';
}

/**
 * @brief Santise a potentially complex array.
 *
 * @param array $arr
 * @return array|string
 */
function activity_sanitise($arr) {
	if($arr) {
		if(is_array($arr)) {
			$ret = array();
			foreach($arr as $k => $x) {
				if(is_array($x))
					$ret[$k] = activity_sanitise($x);
				else
					$ret[$k] = htmlspecialchars($x, ENT_COMPAT, 'UTF-8', false);
			}
			return $ret;
		}
		else {
			return htmlspecialchars($arr, ENT_COMPAT, 'UTF-8', false);
		}
	}

	return '';
}

/**
 * @brief Sanitise a simple linear array.
 *
 * @param array $arr
 * @return array|string
 */
function array_sanitise($arr) {
	if($arr) {
		$ret = array();
		foreach($arr as $x) {
			$ret[] = htmlspecialchars($x, ENT_COMPAT,'UTF-8',false);
		}
		return $ret;
	}

	return '';
}

function encode_item_flags($item) {

//	most of item_flags and item_restrict are local settings which don't apply when transmitted.
//  We may need those for the case of syncing other hub locations which you are attached to.

	$ret = array();

	if($item['item_restrict'] & ITEM_DELETED)
		$ret[] = 'deleted';
	if($item['item_restrict'] & ITEM_HIDDEN)
		$ret[] = 'hidden';
	if($item['item_flags'] & ITEM_THREAD_TOP)
		$ret[] = 'thread_parent';
	if($item['item_flags'] & ITEM_NSFW)
		$ret[] = 'nsfw';
	if($item['item_flags'] & ITEM_CONSENSUS)
		$ret[] = 'consensus';
	if($item['item_private'])
		$ret[] = 'private';

	return $ret;
}

function encode_mail($item,$extended = false) {
	$x = array();
	$x['type'] = 'mail';
	$x['encoding'] = 'zot';

	if(array_key_exists('mail_flags',$item) && ($item['mail_flags'] & MAIL_OBSCURED)) {
		$key = get_config('system','prvkey');
		if($item['title'])
			$item['title'] = crypto_unencapsulate(json_decode_plus($item['title']),$key);
		if($item['body'])
			$item['body'] = crypto_unencapsulate(json_decode_plus($item['body']),$key);
	}

	$x['message_id']     = $item['mid'];
	$x['message_parent'] = $item['parent_mid'];
	$x['created']        = $item['created'];
	$x['expires']        = $item['expires'];
	$x['diaspora_meta']  = $item['diaspora_meta'];
	$x['title']          = $item['title'];
	$x['body']           = $item['body'];
	$x['from']           = encode_item_xchan($item['from']);
	$x['to']             = encode_item_xchan($item['to']);

	if($item['attach'])
		$x['attach']     = json_decode_plus($item['attach']);

	$x['flags'] = array();

	if($item['mail_flags'] & MAIL_RECALLED) {
		$x['flags'][] = 'recalled';
		$x['title'] = '';
		$x['body']  = '';
	}

	if($extended) {
		$x['conv_guid'] = $item['conv_guid'];
		if($item['mail_flags'] & MAIL_DELETED)
			$x['flags'][] = 'deleted';
		if($item['mail_flags'] & MAIL_REPLIED)
			$x['flags'][] = 'replied';
		if($item['mail_flags'] & MAIL_ISREPLY)
			$x['flags'][] = 'isreply';
		if($item['mail_flags'] & MAIL_SEEN)
			$x['flags'][] = 'seen';
	}

	return $x;
}



function get_mail_elements($x) {

	$arr = array();

	$arr['body']         = (($x['body']) ? htmlspecialchars($x['body'], ENT_COMPAT,'UTF-8',false) : '');
	$arr['title']        = (($x['title'])? htmlspecialchars($x['title'],ENT_COMPAT,'UTF-8',false) : '');

	$arr['created']      = datetime_convert('UTC','UTC',$x['created']);
	if((! array_key_exists('expires',$x)) || ($x['expires'] === NULL_DATE))
		$arr['expires'] = NULL_DATE;
	else
		$arr['expires']      = datetime_convert('UTC','UTC',$x['expires']);

	$arr['mail_flags'] = 0;

	if($x['flags'] && is_array($x['flags'])) {
		if(in_array('recalled',$x['flags'])) {
			$arr['mail_flags'] |= MAIL_RECALLED;
		}
		if(in_array('replied',$x['flags'])) {
			$arr['mail_flags'] |= MAIL_REPLIED;
		}
		if(in_array('isreply',$x['flags'])) {
			$arr['mail_flags'] |= MAIL_ISREPLY;
		}
		if(in_array('seen',$x['flags'])) {
			$arr['mail_flags'] |= MAIL_SEEN;
		}
		if(in_array('deleted',$x['flags'])) {
			$arr['mail_flags'] |= MAIL_DELETED;
		}
	}

	$key = get_config('system','pubkey');
	$arr['mail_flags'] |= MAIL_OBSCURED;
	$arr['body'] = htmlspecialchars($arr['body'],ENT_COMPAT,'UTF-8',false);
	if($arr['body'])
		$arr['body']  = json_encode(crypto_encapsulate($arr['body'],$key));
	$arr['title'] = htmlspecialchars($arr['title'],ENT_COMPAT,'UTF-8',false);
	if($arr['title'])
		$arr['title'] = json_encode(crypto_encapsulate($arr['title'],$key));

	if($arr['created'] > datetime_convert())
		$arr['created']  = datetime_convert();

	$arr['mid']          = (($x['message_id'])     ? htmlspecialchars($x['message_id'],     ENT_COMPAT,'UTF-8',false) : '');
	$arr['parent_mid']   = (($x['message_parent']) ? htmlspecialchars($x['message_parent'], ENT_COMPAT,'UTF-8',false) : '');

	if($x['attach'])
		$arr['attach'] = activity_sanitise($x['attach']);

	if(($xchan_hash = import_author_xchan($x['from'])) !== false)
		$arr['from_xchan'] = $xchan_hash;
	else
		return array();

	if(($xchan_hash = import_author_xchan($x['to'])) !== false)
		$arr['to_xchan'] = $xchan_hash;
	else
		return array();

	return $arr;
}


function get_profile_elements($x) {

	$arr = array();

	if(($xchan_hash = import_author_xchan($x['from'])) !== false)
		$arr['xprof_hash'] = $xchan_hash;
	else
		return array();

	$arr['desc']         = (($x['title']) ? htmlspecialchars($x['title'],ENT_COMPAT,'UTF-8',false) : '');

	$arr['dob']          = datetime_convert('UTC','UTC',$x['birthday'],'Y-m-d');
	$arr['age']          = (($x['age']) ? intval($x['age']) : 0);

	$arr['gender']       = (($x['gender'])    ? htmlspecialchars($x['gender'],    ENT_COMPAT,'UTF-8',false) : '');
	$arr['marital']      = (($x['marital'])   ? htmlspecialchars($x['marital'],   ENT_COMPAT,'UTF-8',false) : '');
	$arr['sexual']       = (($x['sexual'])    ? htmlspecialchars($x['sexual'],    ENT_COMPAT,'UTF-8',false) : '');
	$arr['locale']       = (($x['locale'])    ? htmlspecialchars($x['locale'],    ENT_COMPAT,'UTF-8',false) : '');
	$arr['region']       = (($x['region'])    ? htmlspecialchars($x['region'],    ENT_COMPAT,'UTF-8',false) : '');
	$arr['postcode']     = (($x['postcode'])  ? htmlspecialchars($x['postcode'],  ENT_COMPAT,'UTF-8',false) : '');
	$arr['country']      = (($x['country'])   ? htmlspecialchars($x['country'],   ENT_COMPAT,'UTF-8',false) : '');

	$arr['keywords']     = (($x['keywords'] && is_array($x['keywords'])) ? array_sanitise($x['keywords']) : array());

	return $arr;
}

/**
 * @param object $feed
 * @param array $item
 * @param[out] array $author
 * @return multitype:multitype: string NULL number Ambigous <NULL, string, number> Ambigous <mixed, string> Ambigous <multitype:multitype:string Ambigous <NULL, string>  , multitype:multitype:string unknown  > multitype:NULL unknown
 */
function get_atom_elements($feed, $item, &$author) {

	//$best_photo = array();

	$res = array();

	$found_author = $item->get_author();
	if($found_author) {
		$author['author_name'] = unxmlify($found_author->get_name());
		$author['author_link'] = unxmlify($found_author->get_link());
		$author['author_is_feed'] = false;
	}
	else {
		$author['author_name'] = unxmlify($feed->get_title());
		$author['author_link'] = unxmlify($feed->get_permalink());
		$author['author_is_feed'] = true;
	}

	if(substr($author['author_link'],-1,1) == '/')
		$author['author_link'] = substr($author['author_link'],0,-1);

	$res['mid'] = base64url_encode(unxmlify($item->get_id()));
	$res['title'] = unxmlify($item->get_title());
	$res['body'] = unxmlify($item->get_content());
	$res['plink'] = unxmlify($item->get_link(0));
	$res['item_flags'] = ITEM_RSS;


	// removing the content of the title if its identically to the body
	// This helps with auto generated titles e.g. from tumblr

	if (title_is_body($res["title"], $res["body"]))
		$res['title'] = "";

	if($res['plink'])
		$base_url = implode('/', array_slice(explode('/',$res['plink']),0,3));
	else
		$base_url = '';

	// 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 $link) {
			if(!x($author, 'author_photo') || ! $author['author_photo']) {
				if($link['attribs']['']['rel'] === 'photo' || $link['attribs']['']['rel'] === 'avatar')
					$author['author_photo'] = unxmlify($link['attribs']['']['href']);
			}
		}
	}

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

	if($rawactor && activity_match($rawactor[0]['child'][NAMESPACE_ACTIVITY]['obj_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']))
					$author['author_link'] = unxmlify($link['attribs']['']['href']);
				if(!x($author, 'author_photo') || ! $author['author_photo']) {
					if($link['attribs']['']['rel'] === 'avatar' || $link['attribs']['']['rel'] === 'photo')
						$author['author_photo'] = unxmlify($link['attribs']['']['href']);
				}
			}
		}
	}

	// check for a yahoo media element (github etc.)

	if(! $author['author_photo']) {
		$rawmedia = $item->get_item_tags(NAMESPACE_YMEDIA,'thumbnail');
		if($rawmedia && $rawmedia[0]['attribs']['']['url']) {
			$author['author_photo'] = strip_tags(unxmlify($rawmedia[0]['attribs']['']['url']));
		}
	}


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

	if((! (x($author,'author_link'))) || (! (x($author,'author_photo')))) {
		$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' && (! $author['author_link'])) {
					$author['author_link'] = unxmlify($link['attribs']['']['href']);
					$author['author_is_feed'] = true;
				}
				if(! $author['author_photo']) {
					if($link['attribs']['']['rel'] === 'photo' || $link['attribs']['']['rel'] === 'avatar')
						$author['author_photo'] = unxmlify($link['attribs']['']['href']);
				}
			}
		}

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

		if($rawactor && activity_match($rawactor[0]['child'][NAMESPACE_ACTIVITY]['obj_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']))
						$author['author_link'] = unxmlify($link['attribs']['']['href']);
					if(! (x($author,'author_photo'))) {
						if($link['attribs']['']['rel'] === 'avatar' || $link['attribs']['']['rel'] === 'photo')
							$author['author_photo'] = unxmlify($link['attribs']['']['href']);
					}
				}
			}
		}
	}

	$apps = $item->get_item_tags(NAMESPACE_STATUSNET,'notice_info');
	if($apps && $apps[0]['attribs']['']['source']) {
		$res['app'] = strip_tags(unxmlify($apps[0]['attribs']['']['source']));
	}

	/*
	 * If there's a copy of the body content which is guaranteed to have survived mangling in transit, use it.
	 */

	$have_real_body = false;

	$rawenv = $item->get_item_tags(NAMESPACE_DFRN, 'env');
	if($rawenv) {
		$have_real_body = true;
		$res['body'] = $rawenv[0]['data'];
		$res['body'] = str_replace(array(' ',"\t","\r","\n"), array('','','',''),$res['body']);
		// make sure nobody is trying to sneak some html tags by us
		$res['body'] = notags(base64url_decode($res['body']));

		// We could probably turn these old Friendica bbcode bookmarks into bookmark tags but we'd have to
		// create a term table item for them. For now just make sure they stay as links.

		$res['body'] = preg_replace('/\[bookmark(.*?)\](.*?)\[\/bookmark\]/','[url$1]$2[/url]',$res['body']);
	}

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

	// 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 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($res['body'],'<') !== false) && (strpos($res['body'],'>') !== false)) {

		$res['body'] = reltoabs($res['body'],$base_url);

		$res['body'] = html2bb_video($res['body']);

		$res['body'] = oembed_html2bbcode($res['body']);

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

		$res['body'] = @html2bbcode($res['body']);
	}
	elseif(! $have_real_body) {

		// it's not one of our messages and it has no tags
		// so it's probably just text. We'll escape it just to be safe.

		$res['body'] = escape_tags($res['body']);
	}

	if($res['plink'] && $res['title']) {
		$res['body'] = '#^[url=' . $res['plink'] . ']' . $res['title'] . '[/url]' . "\n\n" . $res['body'];
		$terms = array();
		$terms[] = array(
			'otype' => TERM_OBJ_POST,
			'type'  => TERM_BOOKMARK,
			'url'   => $res['plink'],
			'term'  => $res['title'],
		);
	}
	elseif($res['plink']) {
		$res['body'] = '#^[url]' . $res['plink'] . '[/url]' . "\n\n" . $res['body'];
		$terms = array();
		$terms[] = array(
			'otype' => TERM_OBJ_POST,
			'type'  => TERM_BOOKMARK,
			'url'   => $res['plink'],
			'term'  => $res['plink'],
		);
	}

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

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

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

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

	if((x($res,'edited')) && (! (x($res,'created'))))
		$res['created'] = $res['edited'];

	if(! $res['created'])
		$res['created'] = $item->get_date('c');

	if(! $res['edited'])
		$res['edited'] = $item->get_date('c');


	// Disallow time travelling posts

	$d1 = strtotime($res['created']);
	$d2 = strtotime($res['edited']);
	$d3 = strtotime('now');

	if($d1 > $d3)
		$res['created'] = datetime_convert();
	if($d2 > $d3)
		$res['edited'] = datetime_convert();

	$res['created'] = datetime_convert('UTC','UTC',$res['created']);
	$res['edited'] = datetime_convert('UTC','UTC',$res['edited']);

	$rawowner = $item->get_item_tags(NAMESPACE_DFRN, 'owner');
	if(! $rawowner)
		$rawowner = $item->get_item_tags(NAMESPACE_ZOT,'owner');

	if($rawowner[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['name'][0]['data'])
		$author['owner_name'] = unxmlify($rawowner[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['name'][0]['data']);
	elseif($rawowner[0]['child'][NAMESPACE_DFRN]['name'][0]['data'])
		$author['owner_name'] = unxmlify($rawowner[0]['child'][NAMESPACE_DFRN]['name'][0]['data']);
	if($rawowner[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['uri'][0]['data'])
		$author['owner_link'] = unxmlify($rawowner[0]['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['uri'][0]['data']);
	elseif($rawowner[0]['child'][NAMESPACE_DFRN]['uri'][0]['data'])
		$author['owner_link'] = unxmlify($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 $link) {
			if(!x($author, 'owner_photo') || ! $author['owner_photo']) {
				if($link['attribs']['']['rel'] === 'photo' || $link['attribs']['']['rel'] === 'avatar')
					$author['owner_photo'] = unxmlify($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']);
	}

	// translate OStatus unfollow to activity streams if it happened to get selected

	if((x($res,'verb')) && ($res['verb'] === 'http://ostatus.org/schema/1.0/unfollow'))
		$res['verb'] = ACTIVITY_UNFOLLOW;

	$cats = $item->get_categories();
	if($cats) {
		if(is_null($terms))
			$terms = array();
		foreach($cats as $cat) {
			$term = $cat->get_term();
			if(! $term)
				$term = $cat->get_label();
			$scheme = $cat->get_scheme();
			$termurl = '';
			if($scheme && $term && stristr($scheme,'X-DFRN:')) {
				$termtype = ((substr($scheme,7,1) === '#') ? TERM_HASHTAG : TERM_MENTION);
				$termurl = unxmlify(substr($scheme,9));
			}
			else {
				$termtype = TERM_CATEGORY;
			}
			$termterm = notags(trim(unxmlify($term)));

			if($termterm) {
				$terms[] = array(
					'otype' => TERM_OBJ_POST,
					'type'  => $termtype,
					'url'   => $termurl,
					'term'  => $termterm,
				);
			}
		}
	}

	if(! is_null($terms))
		$res['term'] =  $terms;

	$attach = $item->get_enclosures();
	if($attach) {
		$res['attach'] = array();
		foreach($attach as $att) {
			$len   = intval($att->get_length());
			$link  = str_replace(array(',','"'),array('%2D','%22'),notags(trim(unxmlify($att->get_link()))));
			$title = str_replace(array(',','"'),array('%2D','%22'),notags(trim(unxmlify($att->get_title()))));
			$type  = str_replace(array(',','"'),array('%2D','%22'),notags(trim(unxmlify($att->get_type()))));
			if(strpos($type,';'))
				$type = substr($type,0,strpos($type,';'));
			if((! $link) || (strpos($link,'http') !== 0))
				continue;

			if(! $title)
				$title = ' ';
			if(! $type)
				$type = 'application/octet-stream';

			$res['attach'][] = array('href' => $link, 'length' => $len, 'type' => $type, 'title' => $title );
		}
	}

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

	if($rawobj) {
		$obj = array();

		$child = $rawobj[0]['child'];
		if($child[NAMESPACE_ACTIVITY]['obj_type'][0]['data']) {
			$res['obj_type'] = $child[NAMESPACE_ACTIVITY]['obj_type'][0]['data'];
			$obj['type'] = $child[NAMESPACE_ACTIVITY]['obj_type'][0]['data'];
		}
		if(x($child[SIMPLEPIE_NAMESPACE_ATOM_10], 'id') && $child[SIMPLEPIE_NAMESPACE_ATOM_10]['id'][0]['data'])
			$obj['id'] = $child[SIMPLEPIE_NAMESPACE_ATOM_10]['id'][0]['data'];
		if(x($child[SIMPLEPIE_NAMESPACE_ATOM_10], 'link') && $child[SIMPLEPIE_NAMESPACE_ATOM_10]['link'])
			$obj['link'] = encode_rel_links($child[SIMPLEPIE_NAMESPACE_ATOM_10]['link']);
		if(x($child[SIMPLEPIE_NAMESPACE_ATOM_10], 'title') && $child[SIMPLEPIE_NAMESPACE_ATOM_10]['title'][0]['data'])
			$obj['title'] =  $child[SIMPLEPIE_NAMESPACE_ATOM_10]['title'][0]['data'];
		if(x($child[SIMPLEPIE_NAMESPACE_ATOM_10], 'content') && $child[SIMPLEPIE_NAMESPACE_ATOM_10]['content'][0]['data']) {
			$body = $child[SIMPLEPIE_NAMESPACE_ATOM_10]['content'][0]['data'];
			if(! $body)
				$body = $child[SIMPLEPIE_NAMESPACE_ATOM_10]['summary'][0]['data'];
			// preserve a copy of the original body content in case we later need to parse out any microformat information, e.g. events
			$obj['orig'] = xmlify($body);
			if((strpos($body,'<') !== false) || (strpos($body,'>') !== false)) {
				$body = purify_html($body);
				$body = html2bbcode($body);
			}

			$obj['content'] = $body;
		}

		$res['object'] = $obj;
	}

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

	if($rawobj) {
		$obj = array();

		$child = $rawobj[0]['child'];
		if($child[NAMESPACE_ACTIVITY]['obj_type'][0]['data']) {
			$res['tgt_type'] = $child[NAMESPACE_ACTIVITY]['obj_type'][0]['data'];
			$obj['type'] = $child[NAMESPACE_ACTIVITY]['obj_type'][0]['data'];
		}
		if(x($child[SIMPLEPIE_NAMESPACE_ATOM_10], 'id') && $child[SIMPLEPIE_NAMESPACE_ATOM_10]['id'][0]['data'])
			$obj['id'] = $child[SIMPLEPIE_NAMESPACE_ATOM_10]['id'][0]['data'];
		if(x($child[SIMPLEPIE_NAMESPACE_ATOM_10], 'link') && $child[SIMPLEPIE_NAMESPACE_ATOM_10]['link'])
			$obj['link'] = encode_rel_links($child[SIMPLEPIE_NAMESPACE_ATOM_10]['link']);
		if(x($child[SIMPLEPIE_NAMESPACE_ATOM_10], 'title') && $child[SIMPLEPIE_NAMESPACE_ATOM_10]['title'][0]['data'])
			$obj['title'] =  $child[SIMPLEPIE_NAMESPACE_ATOM_10]['title'][0]['data'];
		if(x($child[SIMPLEPIE_NAMESPACE_ATOM_10], 'content') && $child[SIMPLEPIE_NAMESPACE_ATOM_10]['content'][0]['data']) {
			$body = $child[SIMPLEPIE_NAMESPACE_ATOM_10]['content'][0]['data'];
			if(! $body)
				$body = $child[SIMPLEPIE_NAMESPACE_ATOM_10]['summary'][0]['data'];

			// preserve a copy of the original body content in case we later need to parse out any microformat information, e.g. events
			$obj['orig'] = xmlify($body);
			if((strpos($body,'<') !== false) || (strpos($body,'>') !== false)) {
				$body = purify_html($body);
				$body = html2bbcode($body);
			}

			$obj['content'] = $body;
		}

		$res['target'] = $obj;
	}

	$res['public_policy'] = 'specific';
	$res['comment_policy'] = 'none';

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

	call_hooks('parse_atom', $arr);
	logger('get_atom_elements: author: ' . print_r($author,true),LOGGER_DATA);

	logger('get_atom_elements: ' . print_r($res,true),LOGGER_DATA);

	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 .= 'href="' . $link['attribs']['']['href'] . '" ';
		if( (x($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);
}

/**
 * @brief
 *
 * @param array $arr
 * @param boolean $allow_exec (optional) default false
 * @return array
 *   * \e boolean \b success
 *   * \e int \b item_id
 */
function item_store($arr, $allow_exec = false) {

	$d = array('item' => $arr, 'allow_exec' => $allow_exec);
	call_hooks('item_store', $d );
	$arr = $d['item'];
	$allow_exec = $d['allow_exec'];

	$ret = array('success' => false, 'item_id' => 0);

	if(! $arr['uid']) {
		logger('item_store: no uid');
		$ret['message'] = 'No uid.';
		return $ret;
	}

	//$uplinked_comment = false;

	// If a page layout is provided, ensure it exists and belongs to us.

	if(array_key_exists('layout_mid',$arr) && $arr['layout_mid']) {
		$l = q("select item_restrict from item where mid = '%s' and uid = %d limit 1",
			dbesc($arr['layout_mid']),
			intval($arr['uid'])
		);
		if((! $l) || (! ($l[0]['item_restrict'] & ITEM_PDL)))
			unset($arr['layout_mid']);
	}

	// Don't let anybody set these, either intentionally or accidentally

	if(array_key_exists('id',$arr))
		unset($arr['id']);
	if(array_key_exists('parent',$arr))
		unset($arr['parent']);

	$arr['mimetype']      = ((x($arr,'mimetype'))      ? notags(trim($arr['mimetype']))      : 'text/bbcode');

	if(($arr['mimetype'] == 'application/x-php') && (! $allow_exec)) {
		logger('item_store: php mimetype but allow_exec is denied.');
		$ret['message'] = 'exec denied.';
		return $ret;
	}


	$arr['title'] = ((array_key_exists('title',$arr) && strlen($arr['title']))  ? trim($arr['title']) : '');
	$arr['body']  = ((array_key_exists('body',$arr) && strlen($arr['body']))    ? trim($arr['body'])  : '');

	$arr['diaspora_meta'] = ((x($arr,'diaspora_meta')) ? $arr['diaspora_meta']               : '');
	$arr['allow_cid']     = ((x($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'])              : '');
	$arr['item_private']  = ((x($arr,'item_private'))  ? intval($arr['item_private'])        : 0 );
	$arr['item_flags']    = ((x($arr,'item_flags'))    ? intval($arr['item_flags'])          : 0 );

	// only detect language if we have text content, and if the post is private but not yet
	// obscured, make it so.

	if(! ($arr['item_flags'] & ITEM_OBSCURED)) {

		$arr['lang'] = detect_language($arr['body']);
		// apply the input filter here - if it is obscured it has been filtered already
		$arr['body'] = trim(z_input_filter($arr['uid'],$arr['body'],$arr['mimetype']));

		if(local_channel() && (! $arr['sig'])) {
			$channel = get_app()->get_channel();
			if($channel['channel_hash'] === $arr['author_xchan']) {
				$arr['sig'] = base64url_encode(rsa_sign($arr['body'],$channel['channel_prvkey']));
				$arr['item_flags'] |= ITEM_VERIFIED;
			}
		}

		$allowed_languages = get_pconfig($arr['uid'],'system','allowed_languages');

		if((is_array($allowed_languages)) && ($arr['lang']) && (! array_key_exists($arr['lang'],$allowed_languages))) {
			$translate = array('item' => $arr, 'from' => $arr['lang'], 'to' => $allowed_languages, 'translated' => false);
			call_hooks('item_translate', $translate);
			if((! $translate['translated']) && (intval(get_pconfig($arr['uid'],'system','reject_disallowed_languages')))) {
				logger('item_store: language ' . $arr['lang'] . ' not accepted for uid ' . $arr['uid']);
				$ret['message'] = 'language not accepted';
				return $ret;
			}
			$arr = $translate['item'];
		}
		if($arr['item_private']) {
			$key = get_config('system','pubkey');
			$arr['item_flags'] = $arr['item_flags'] | ITEM_OBSCURED;
			if($arr['title'])
				$arr['title'] = json_encode(crypto_encapsulate($arr['title'],$key));
			if($arr['body'])
				$arr['body']  = json_encode(crypto_encapsulate($arr['body'],$key));
		}
	}

	if((x($arr,'object')) && is_array($arr['object'])) {
		activity_sanitise($arr['object']);
		$arr['object'] = json_encode($arr['object']);
	}

	if((x($arr,'target')) && is_array($arr['target'])) {
		activity_sanitise($arr['target']);
		$arr['target'] = json_encode($arr['target']);
	}

	if((x($arr,'attach')) && is_array($arr['attach'])) {
		activity_sanitise($arr['attach']);
		$arr['attach'] = json_encode($arr['attach']);
	}

	$arr['aid']           = ((x($arr,'aid'))           ? intval($arr['aid'])                 : 0);
	$arr['mid']           = ((x($arr,'mid'))           ? notags(trim($arr['mid']))           : random_string());
	$arr['author_xchan']  = ((x($arr,'author_xchan'))  ? notags(trim($arr['author_xchan']))  : '');
	$arr['owner_xchan']   = ((x($arr,'owner_xchan'))   ? notags(trim($arr['owner_xchan']))   : '');
	$arr['created']       = ((x($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());
	$arr['expires']       = ((x($arr,'expires')  !== false) ? datetime_convert('UTC','UTC',$arr['expires'])  : NULL_DATE);
	$arr['commented']     = ((x($arr,'commented')  !== false) ? datetime_convert('UTC','UTC',$arr['commented'])  : datetime_convert());
	$arr['comments_closed'] = ((x($arr,'comments_closed')  !== false) ? datetime_convert('UTC','UTC',$arr['comments_closed'])  : NULL_DATE);

	$arr['received']      = datetime_convert();
	$arr['changed']       = datetime_convert();
	$arr['location']      = ((x($arr,'location'))      ? notags(trim($arr['location']))      : '');
	$arr['coord']         = ((x($arr,'coord'))         ? notags(trim($arr['coord']))         : '');
	$arr['parent_mid']    = ((x($arr,'parent_mid'))    ? notags(trim($arr['parent_mid']))    : '');
	$arr['thr_parent']    = ((x($arr,'thr_parent'))    ? notags(trim($arr['thr_parent']))    : $arr['parent_mid']);
	$arr['verb']          = ((x($arr,'verb'))          ? notags(trim($arr['verb']))          : ACTIVITY_POST);
	$arr['obj_type']      = ((x($arr,'obj_type'))      ? notags(trim($arr['obj_type']))      : ACTIVITY_OBJ_NOTE);
	$arr['object']        = ((x($arr,'object'))        ? trim($arr['object'])                : '');
	$arr['tgt_type']      = ((x($arr,'tgt_type'))      ? notags(trim($arr['tgt_type']))      : '');
	$arr['target']        = ((x($arr,'target'))        ? trim($arr['target'])                : '');
	$arr['plink']         = ((x($arr,'plink'))         ? notags(trim($arr['plink']))         : '');
	$arr['attach']        = ((x($arr,'attach'))        ? notags(trim($arr['attach']))        : '');
	$arr['app']           = ((x($arr,'app'))           ? notags(trim($arr['app']))           : '');
	$arr['item_restrict'] = ((x($arr,'item_restrict')) ? intval($arr['item_restrict'])       : 0 );

	$arr['public_policy'] = ((x($arr,'public_policy')) ? notags(trim($arr['public_policy']))  : '' );

	$arr['comment_policy'] = ((x($arr,'comment_policy')) ? notags(trim($arr['comment_policy']))  : 'contacts' );

	$arr['item_unseen'] = ((array_key_exists('item_unseen',$arr)) ? intval($arr['item_unseen']) : 1);

	if($arr['comment_policy'] == 'none')
		$arr['item_flags'] = $arr['item_flags'] | ITEM_NOCOMMENT;

	// handle time travelers
	// Allow a bit of fudge in case somebody just has a slightly slow/fast clock

	$d1 = new DateTime('now +10 minutes', new DateTimeZone('UTC'));
	$d2 = new DateTime($arr['created'] . '+00:00');
	if($d2 > $d1)
		$arr['item_restrict'] = $arr['item_restrict'] | ITEM_DELAYED_PUBLISH;

	$arr['llink'] = z_root() . '/display/' . $arr['mid'];

	if(! $arr['plink'])
		$arr['plink'] = $arr['llink'];

	if($arr['parent_mid'] === $arr['mid']) {
		$parent_id = 0;
		$parent_deleted = 0;
		$allow_cid = $arr['allow_cid'];
		$allow_gid = $arr['allow_gid'];
		$deny_cid  = $arr['deny_cid'];
		$deny_gid  = $arr['deny_gid'];
		$public_policy = $arr['public_policy'];
		$comments_closed = $arr['comments_closed'];
		$arr['item_flags'] = $arr['item_flags'] | ITEM_THREAD_TOP;
	}
	else {

		// find the parent and snarf the item id and ACL's
		// and anything else we need to inherit

		$r = q("SELECT * FROM `item` WHERE `mid` = '%s' AND `uid` = %d ORDER BY `id` ASC LIMIT 1",
			dbesc($arr['parent_mid']),
			intval($arr['uid'])
		);

		if($r) {

			// in case item_store was killed before the parent's parent attribute got set,
			// set it now. This happens with some regularity on Dreamhost. This will keep
			// us from getting notifications for threads that exist but which we can't see.

			if(($r[0]['mid'] === $r[0]['parent_mid']) && (! intval($r[0]['parent']))) {
				q("update item set parent = id where id = %d",
					intval($r[0]['id'])
				);
			}

			if(comments_are_now_closed($r[0])) {
				logger('item_store: comments closed');
				$ret['message'] = 'Comments closed.';
				return $ret;
			}

			if($arr['obj_type'] == ACTIVITY_OBJ_NOTE)
				$arr['obj_type'] = ACTIVITY_OBJ_COMMENT;

			// 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]['mid'] != $r[0]['parent_mid']) {
				$arr['parent_mid'] = $r[0]['parent_mid'];
				$z = q("SELECT * FROM `item` WHERE `mid` = '%s' AND `parent_mid` = '%s' AND `uid` = %d
					ORDER BY `id` ASC LIMIT 1",
					dbesc($r[0]['parent_mid']),
					dbesc($r[0]['parent_mid']),
					intval($arr['uid'])
				);
				if($z && count($z))
					$r = $z;
			}

			$parent_id       = $r[0]['id'];
			$parent_deleted  = $r[0]['item_restrict'] & ITEM_DELETED;
			$allow_cid       = $r[0]['allow_cid'];
			$allow_gid       = $r[0]['allow_gid'];
			$deny_cid        = $r[0]['deny_cid'];
			$deny_gid        = $r[0]['deny_gid'];
			$public_policy   = $r[0]['public_policy'];
			$comments_closed = $r[0]['comments_closed'];

			if($r[0]['item_flags'] & ITEM_WALL)
				$arr['item_flags'] = $arr['item_flags'] | ITEM_WALL;

			// An uplinked comment might arrive with a downstream owner.
			// Fix it.

			if($r[0]['owner_xchan'] !== $arr['owner_xchan']) {
				$arr['owner_xchan'] = $r[0]['owner_xchan'];
//				$uplinked_comment = true;
			}

			// if the parent is private, force privacy for the entire conversation

			if($r[0]['item_private'])
				$arr['item_private'] = $r[0]['item_private'];

			// Edge case. We host a public forum that was originally posted to privately.
			// The original author commented, but as this is a comment, the permissions
			// weren't fixed up so it will still show the comment as private unless we fix it here.

			if((intval($r[0]['item_flags']) & ITEM_UPLINK) && (! $r[0]['item_private']))
				$arr['item_private'] = 0;
		}
		else {
			logger('item_store: item parent was not found - ignoring item');
			$ret['message'] = 'parent not found.';
			return $ret;
		}
	}

	if($parent_deleted)
		$arr['item_restrict'] = $arr['item_restrict'] | ITEM_DELETED;

	$r = q("SELECT `id` FROM `item` WHERE `mid` = '%s' AND `uid` = %d LIMIT 1",
		dbesc($arr['mid']),
		intval($arr['uid'])
	);
	if($r) {
		logger('item_store: duplicate item ignored. ' . print_r($arr,true));
		$ret['message'] = 'duplicate post.';
		return $ret;
	}

	call_hooks('item_store',$arr);

	// This hook remains for backward compatibility.
	call_hooks('post_remote',$arr);

	if(x($arr,'cancel')) {
		logger('item_store: post cancelled by plugin.');
		$ret['message'] = 'cancelled.';
		return $ret;
	}

	// pull out all the taxonomy stuff for separate storage

	$terms = null;
	if(array_key_exists('term',$arr)) {
		$terms = $arr['term'];
		unset($arr['term']);
	}

 	if(strlen($allow_cid) || strlen($allow_gid) || strlen($deny_cid) || strlen($deny_gid) || strlen($public_policy))
		$private = 1;
	else
		$private = $arr['item_private'];

	$arr['parent']          = $parent_id;
	$arr['allow_cid']       = $allow_cid;
	$arr['allow_gid']       = $allow_gid;
	$arr['deny_cid']        = $deny_cid;
	$arr['deny_gid']        = $deny_gid;
	$arr['public_policy']   = $public_policy;
	$arr['item_private']    = $private;
	$arr['comments_closed'] = $comments_closed;

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

	dbesc_array($arr);

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

	// find the item we just created

	$r = q("SELECT * FROM `item` WHERE `mid` = '%s' AND `uid` = %d ORDER BY `id` ASC ",
		$arr['mid'],           // already dbesc'd
		intval($arr['uid'])
	);

	if($r && count($r)) {
		$current_post = $r[0]['id'];
		$arr = $r[0];  // This will gives us a fresh copy of what's now in the DB and undo the db escaping, which really messes up the notifications
		logger('item_store: created item ' . $current_post, LOGGER_DEBUG);
	}
	else {
		logger('item_store: could not locate stored item');
		$ret['message'] = 'unable to retrieve.';
		return $ret;
	}
	if(count($r) > 1) {
		logger('item_store: duplicated post occurred. Removing duplicates.');
		q("DELETE FROM `item` WHERE `mid` = '%s' AND `uid` = %d AND `id` != %d ",
			$arr['mid'],
			intval($arr['uid']),
			intval($current_post)
		);
	}

	$arr['id'] = $current_post;

	if(! intval($r[0]['parent'])) {
		$x = q("update item set parent = id where id = %d",
			intval($r[0]['id'])
		);
	}


	// Store taxonomy

	if(($terms) && (is_array($terms))) {
		foreach($terms as $t) {
			q("insert into term (uid,oid,otype,type,term,url)
				values(%d,%d,%d,%d,'%s','%s') ",
				intval($arr['uid']),
				intval($current_post),
				intval(TERM_OBJ_POST),
				intval($t['type']),
				dbesc($t['term']),
				dbesc($t['url'])
			);
		}

		$arr['term'] = $terms;
	}

	call_hooks('post_remote_end',$arr);

	// update the commented timestamp on the parent

	$z = q("select max(created) as commented from item where parent_mid = '%s' and uid = %d and not ( item_restrict & %d )>0 ",
		dbesc($arr['parent_mid']),
		intval($arr['uid']),
		intval(ITEM_DELAYED_PUBLISH)
	);

	q("UPDATE item set commented = '%s', changed = '%s' WHERE id = %d",
		dbesc(($z) ? $z[0]['commented'] : (datetime_convert())),
		dbesc(datetime_convert()),
		intval($parent_id)
	);


	// If _creating_ a deleted item, don't propagate it further or send out notifications.
	// We need to store the item details just in case the delete came in before the original post,
	// so that we have an item in the DB that's marked deleted and won't store a fresh post
	// that isn't aware that we were already told to delete it.

	if(! ($arr['item_restrict'] & ITEM_DELETED)) {
		send_status_notifications($current_post,$arr);
		tag_deliver($arr['uid'],$current_post);
	}

	$ret['success'] = true;
	$ret['item_id'] = $current_post;

	return $ret;
}



function item_store_update($arr,$allow_exec = false) {

	$d = array('item' => $arr, 'allow_exec' => $allow_exec);
	call_hooks('item_store_update', $d );
	$arr = $d['item'];
	$allow_exec = $d['allow_exec'];

	$ret = array('success' => false, 'item_id' => 0);
	if(! intval($arr['uid'])) {
		logger('item_store_update: no uid');
		$ret['message'] = 'no uid.';
		return $ret;
	}
	if(! intval($arr['id'])) {
		logger('item_store_update: no id');
		$ret['message'] = 'no id.';
		return $ret;
	}

	$orig_post_id = $arr['id'];
	$uid = $arr['uid'];

	$orig = q("select * from item where id = %d and uid = %d limit 1",
		intval($orig_post_id),
		intval($uid)
	);
	if(! $orig) {
		logger('item_store_update: original post not found: ' . $orig_post_id);
		$ret['message'] = 'no original';
		return $ret;
	}

	// override the unseen flag with the original

	if(intval($arr['item_flags']))
		$arr['item_unseen'] = 0;

	if($orig[0]['item_flags'] & ITEM_VERIFIED)
		$orig[0]['item_flags'] = $orig[0]['item_flags'] ^ ITEM_VERIFIED;

	if($orig[0]['item_flags'] & ITEM_OBSCURED)
		$orig[0]['item_flags'] = $orig[0]['item_flags'] ^ ITEM_OBSCURED;

	$arr['item_flags'] = intval($arr['item_flags']) | $orig[0]['item_flags'];
	$arr['item_restrict'] = intval($arr['item_restrict']) | $orig[0]['item_restrict'];

	if(array_key_exists('edit',$arr))
		unset($arr['edit']);

	$arr['mimetype']      = ((x($arr,'mimetype'))      ? notags(trim($arr['mimetype']))      : 'text/bbcode');

	if(($arr['mimetype'] == 'application/x-php') && (! $allow_exec)) {
		logger('item_store: php mimetype but allow_exec is denied.');
		$ret['message'] = 'exec denied.';
		return $ret;
	}

	if(! ($arr['item_flags'] & ITEM_OBSCURED)) {

		$arr['lang'] = detect_language($arr['body']);
		// apply the input filter here - if it is obscured it has been filtered already
		$arr['body'] = trim(z_input_filter($arr['uid'],$arr['body'],$arr['mimetype']));

		if(local_channel() && (! $arr['sig'])) {
			$channel = get_app()->get_channel();
			if($channel['channel_hash'] === $arr['author_xchan']) {
				$arr['sig'] = base64url_encode(rsa_sign($arr['body'],$channel['channel_prvkey']));
				$arr['item_flags'] |= ITEM_VERIFIED;
			}
		}

		$allowed_languages = get_pconfig($arr['uid'],'system','allowed_languages');

		if((is_array($allowed_languages)) && ($arr['lang']) && (! array_key_exists($arr['lang'],$allowed_languages))) {
			$translate = array('item' => $arr, 'from' => $arr['lang'], 'to' => $allowed_languages, 'translated' => false);
			call_hooks('item_translate', $translate);
			if((! $translate['translated']) && (intval(get_pconfig($arr['uid'],'system','reject_disallowed_languages')))) {
				logger('item_store: language ' . $arr['lang'] . ' not accepted for uid ' . $arr['uid']);
				$ret['message'] = 'language not accepted';
				return $ret;
			}
			$arr = $translate['item'];
		}
		if($arr['item_private']) {
			$key = get_config('system','pubkey');
			$arr['item_flags'] = $arr['item_flags'] | ITEM_OBSCURED;
			if($arr['title'])
				$arr['title'] = json_encode(crypto_encapsulate($arr['title'],$key));
			if($arr['body'])
				$arr['body']  = json_encode(crypto_encapsulate($arr['body'],$key));
		}
	}

	if((x($arr,'object')) && is_array($arr['object'])) {
		activity_sanitise($arr['object']);
		$arr['object'] = json_encode($arr['object']);
	}

	if((x($arr,'target')) && is_array($arr['target'])) {
		activity_sanitise($arr['target']);
		$arr['target'] = json_encode($arr['target']);
	}

	if((x($arr,'attach')) && is_array($arr['attach'])) {
		activity_sanitise($arr['attach']);
		$arr['attach'] = json_encode($arr['attach']);
	}

	unset($arr['id']);
	unset($arr['uid']);
	unset($arr['aid']);
	unset($arr['mid']);
	unset($arr['parent']);
	unset($arr['parent_mid']);
	unset($arr['created']);
	unset($arr['author_xchan']);
	unset($arr['owner_xchan']);
	unset($arr['thr_parent']);
	unset($arr['llink']);

	$arr['edited']        = ((x($arr,'edited')  !== false) ? datetime_convert('UTC','UTC',$arr['edited'])  : datetime_convert());
	$arr['expires']       = ((x($arr,'expires')  !== false) ? datetime_convert('UTC','UTC',$arr['expires'])  : $orig[0]['expires']);

	if(array_key_exists('comments_closed',$arr) && $arr['comments_closed'] != NULL_DATE)
		$arr['comments_closed'] = datetime_convert('UTC','UTC',$arr['comments_closed']);
	else
		$arr['comments_closed'] = $orig[0]['comments_closed'];

	$arr['commented']     = $orig[0]['commented'];
	$arr['received']      = datetime_convert();
	$arr['changed']       = datetime_convert();
	$arr['route']         = ((array_key_exists('route',$arr)) ? trim($arr['route'])          : $orig[0]['route']);
	$arr['diaspora_meta'] = ((x($arr,'diaspora_meta')) ? $arr['diaspora_meta']               : $orig[0]['diaspora_meta']);
	$arr['location']      = ((x($arr,'location'))      ? notags(trim($arr['location']))      : $orig[0]['location']);
	$arr['coord']         = ((x($arr,'coord'))         ? notags(trim($arr['coord']))         : $orig[0]['coord']);
	$arr['verb']          = ((x($arr,'verb'))          ? notags(trim($arr['verb']))          : $orig[0]['verb']);
	$arr['obj_type']      = ((x($arr,'obj_type'))      ? notags(trim($arr['obj_type']))      : $orig[0]['obj_type']);
	$arr['object']        = ((x($arr,'object'))        ? trim($arr['object'])                : $orig[0]['object']);
	$arr['tgt_type']      = ((x($arr,'tgt_type'))      ? notags(trim($arr['tgt_type']))      : $orig[0]['tgt_type']);
	$arr['target']        = ((x($arr,'target'))        ? trim($arr['target'])                : $orig[0]['target']);
	$arr['plink']         = ((x($arr,'plink'))         ? notags(trim($arr['plink']))         : $orig[0]['plink']);

	$arr['allow_cid']     = ((array_key_exists('allow_cid',$arr))  ? trim($arr['allow_cid']) : $orig[0]['allow_cid']);
	$arr['allow_gid']     = ((array_key_exists('allow_gid',$arr))  ? trim($arr['allow_gid']) : $orig[0]['allow_gid']);
	$arr['deny_cid']      = ((array_key_exists('deny_cid',$arr))   ? trim($arr['deny_cid'])  : $orig[0]['deny_cid']);
	$arr['deny_gid']      = ((array_key_exists('deny_gid',$arr))   ? trim($arr['deny_gid'])  : $orig[0]['deny_gid']);
	$arr['item_private']  = ((array_key_exists('item_private',$arr)) ? intval($arr['item_private']) : $orig[0]['item_private']);

	$arr['title'] = ((array_key_exists('title',$arr))  ? trim($arr['title']) : $orig[0]['title']);
	$arr['body']  = ((array_key_exists('body',$arr))   ? trim($arr['body'])  : $orig[0]['body']);

	$arr['attach']        = ((x($arr,'attach'))        ? notags(trim($arr['attach']))        : $orig[0]['attach']);
	$arr['app']           = ((x($arr,'app'))           ? notags(trim($arr['app']))           : $orig[0]['app']);
//	$arr['item_restrict'] = ((x($arr,'item_restrict')) ? intval($arr['item_restrict'])       : $orig[0]['item_restrict'] );
//	$arr['item_flags']    = ((x($arr,'item_flags'))    ? intval($arr['item_flags'])          : $orig[0]['item_flags'] );

	$arr['sig']           = ((x($arr,'sig'))           ? $arr['sig']                         : '');
	$arr['layout_mid']    = ((array_key_exists('layout_mid',$arr)) ? dbesc($arr['layout_mid'])           : $orig[0]['layout_mid'] );

	$arr['public_policy'] = ((x($arr,'public_policy')) ? notags(trim($arr['public_policy']))  : $orig[0]['public_policy'] );
	$arr['comment_policy'] = ((x($arr,'comment_policy')) ? notags(trim($arr['comment_policy']))  : $orig[0]['comment_policy'] );

	call_hooks('post_remote_update',$arr);

	if(x($arr,'cancel')) {
		logger('item_store_update: post cancelled by plugin.');
		$ret['message'] = 'cancelled.';
		return $ret;
	}

	// pull out all the taxonomy stuff for separate storage

	$terms = null;
	if(array_key_exists('term',$arr)) {
		$terms = $arr['term'];
		unset($arr['term']);
	}

	dbesc_array($arr);

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

	$str = '';
	foreach($arr as $k => $v) {
		if($str)
			$str .= ",";
		$str .= " `" . $k . "` = '" . $v . "' ";
	}

	$r = dbq("update `item` set " . $str . " where id = " . $orig_post_id );

	if($r)
		logger('item_store_update: updated item ' . $orig_post_id, LOGGER_DEBUG);
	else {
		logger('item_store_update: could not update item');
		$ret['message'] = 'DB update failed.';
		return $ret;
	}

	$r = q("delete from term where oid = %d and otype = %d",
		intval($orig_post_id),
		intval(TERM_OBJ_POST)
	);

	if(is_array($terms)) {
		foreach($terms as $t) {
			q("insert into term (uid,oid,otype,type,term,url)
				values(%d,%d,%d,%d,'%s','%s') ",
				intval($uid),
				intval($orig_post_id),
				intval(TERM_OBJ_POST),
				intval($t['type']),
				dbesc($t['term']),
				dbesc($t['url'])
			);
		}
		$arr['term'] = $terms;
	}

	call_hooks('post_remote_update_end',$arr);

	send_status_notifications($orig_post_id,$arr);

	tag_deliver($uid,$orig_post_id);
	$ret['success'] = true;
	$ret['item_id'] = $orig_post_id;

	return $ret;
}



function store_diaspora_comment_sig($datarray, $channel, $parent_item, $post_id, $walltowall = false) {

	// We won't be able to sign Diaspora comments for authenticated visitors
	// - we don't have their private key

	// since Diaspora doesn't handle edits we can only do this for the original text and not update it.

	require_once('include/bb2diaspora.php');
	$signed_body = bb2diaspora_itembody($datarray,$walltowall);

	if($walltowall) {
		logger('wall to wall comment',LOGGER_DEBUG);
		// post will come across with the owner's identity. Throw a preamble onto the post to indicate the true author.
		$signed_body = "\n\n"
			. '![' . $datarray['author']['xchan_name'] . '](' . $datarray['author']['xchan_photo_m'] . ')'
			. '[' . $datarray['author']['xchan_name'] . '](' . $datarray['author']['xchan_url'] . ')' . "\n\n"
			. $signed_body;
	}

	logger('storing diaspora comment signature',LOGGER_DEBUG);

	$diaspora_handle = $channel['channel_address'] . '@' . get_app()->get_hostname();

	$signed_text = $datarray['mid'] . ';' . $parent_item['mid'] . ';' . $signed_body . ';' . $diaspora_handle;

	/** @FIXME $uprvkey is undefined, do we still need this if-statement? */
	if( $uprvkey !== false )
		$authorsig = base64_encode(rsa_sign($signed_text, $channel['channel_prvkey'], 'sha256'));
	else
		$authorsig = '';

	$x = array('signer' => $diaspora_handle, 'body' => $signed_body, 'signed_text' => $signed_text, 'signature' => base64_encode($authorsig));

	$key = get_config('system','pubkey');
	$y = crypto_encapsulate(json_encode($x),$key);

	$r = q("update item set diaspora_meta = '%s' where id = %d",
		dbesc(json_encode($y)),
		intval($post_id)
	);

	if(! $r)
		logger('store_diaspora_comment_sig: DB write failed');

	return;
}



function send_status_notifications($post_id,$item) {

	$notify = false;
	$parent = 0;

	$r = q("select channel_hash from channel where channel_id = %d limit 1",
		intval($item['uid'])
	);
	if(! $r)
		return;

	// my own post - no notification needed
	if($item['author_xchan'] === $r[0]['channel_hash'])
		return;

	// I'm the owner - notify me

	if($item['owner_hash'] === $r[0]['channel_hash'])
		$notify = true;

	// Was I involved in this conversation?

	$x = q("select * from item where parent_mid = '%s' and uid = %d",
		dbesc($item['parent_mid']),
		intval($item['uid'])
	);
	if($x) {
		foreach($x as $xx) {
			if($xx['author_xchan'] === $r[0]['channel_hash']) {
				$notify = true;
			}
			if($xx['id'] == $xx['parent']) {
				$parent = $xx['parent'];
			}
		}
	}

	$link =  get_app()->get_baseurl() . '/display/' . $item['mid'];

	$y = q("select id from notify where link = '%s' and uid = %d limit 1",
		dbesc($link),
		intval($item['uid'])
	);

	if($y)
		$notify = false;

	if(! $notify)
		return;

	require_once('include/enotify.php');
	notification(array(
		'type'         => NOTIFY_COMMENT,
		'from_xchan'   => $item['author_xchan'],
		'to_xchan'     => $r[0]['channel_hash'],
		'item'         => $item,
		'link'         => $link,
		'verb'         => ACTIVITY_POST,
		'otype'        => 'item',
		'parent'       => $parent,
		'parent_mid'   => $item['parent_mid']
	));
}


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;
}

/**
 * @brief Called when we deliver things that might be tagged in ways that require delivery processing.
 *
 * Handles community tagging of posts and also look for mention tags and sets up
 * a second delivery chain if appropriate.
 *
 * @param int $uid
 * @param int $item_id
 */
function tag_deliver($uid, $item_id) {

	$mention = false;

	/*
	 * Fetch stuff we need - a channel and an item
	 */

	$u = q("select * from channel left join xchan on channel_hash = xchan_hash where channel_id = %d limit 1",
		intval($uid)
	);
	if(! $u)
		return;

	$i = q("select * from item where id = %d and uid = %d limit 1",
		intval($item_id),
		intval($uid)
	);
	if(! $i)
		return;

	$i = fetch_post_tags($i);

	$item = $i[0];

	if(($item['source_xchan']) && ($item['item_flags'] & ITEM_UPLINK)
		&& ($item['item_flags'] & ITEM_THREAD_TOP) && ($item['edited'] != $item['created'])) {
		// this is an update (edit) to a post which was already processed by us and has a second delivery chain
		// Just start the second delivery chain to deliver the updated post
		proc_run('php','include/notifier.php','tgroup',$item['id']);
		return;
	}

	/*
	 * Seems like a good place to plug in a poke notification.
	 */

	if (stristr($item['verb'],ACTIVITY_POKE)) {
		$poke_notify = true;

		if(($item['obj_type'] == "") || ($item['obj_type'] !== ACTIVITY_OBJ_PERSON) || (! $item['object']))
			$poke_notify = false;

		$obj = json_decode_plus($item['object']);
		if($obj) {
			if($obj['id'] !== $u[0]['channel_hash'])
				$poke_notify = false;
		}
		if($item['item_restrict'] & ITEM_DELETED)
			$poke_notify = false;

		$verb = urldecode(substr($item['verb'],strpos($item['verb'],'#')+1));
		if($poke_notify) {
			require_once('include/enotify.php');
			notification(array(
				'to_xchan'     => $u[0]['channel_hash'],
				'from_xchan'   => $item['author_xchan'],
				'type'         => NOTIFY_POKE,
				'item'         => $item,
				'link'         => $i[0]['llink'],
				'verb'         => ACTIVITY_POKE,
				'activity'     => $verb,
				'otype'        => 'item'
			));
		}
	}

	/*
	 * Do community tagging
	 */

	if($item['obj_type'] === ACTIVITY_OBJ_TAGTERM) {

		// We received a community tag activity for a post.
		// See if we are the owner of the parent item and have given permission to tag our posts.
		// If so tag the parent post.

		logger('tag_deliver: community tag activity received');

		if(($item['owner_xchan'] === $u[0]['channel_hash']) && (! get_pconfig($u[0]['channel_id'],'system','blocktags'))) {
			logger('tag_deliver: community tag recipient: ' . $u[0]['channel_name']);
			$j_tgt = json_decode_plus($item['target']);
			if($j_tgt && $j_tgt['id']) {
				$p = q("select * from item where mid = '%s' and uid = %d limit 1",
					dbesc($j_tgt['id']),
					intval($u[0]['channel_id'])
				);
				if($p) {
					$j_obj = json_decode_plus($item['object']);
					logger('tag_deliver: tag object: ' . print_r($j_obj,true), LOGGER_DATA);
					if($j_obj && $j_obj['id'] && $j_obj['title']) {
						if(is_array($j_obj['link']))
							$taglink = get_rel_link($j_obj['link'],'alternate');

						store_item_tag($u[0]['channel_id'],$p[0]['id'],TERM_OBJ_POST,TERM_HASHTAG,$j_obj['title'],$j_obj['id']);
						$x = q("update item set edited = '%s', received = '%s', changed = '%s' where mid = '%s' and uid = %d",
							dbesc(datetime_convert()),
							dbesc(datetime_convert()),
							dbesc(datetime_convert()),
							dbesc($j_tgt['id']),
							intval($u[0]['channel_id'])
						);
						proc_run('php','include/notifier.php','edit_post',$p[0]['id']);
					}
				}
			}
		}
		else
			logger('tag_deliver: tag permission denied for ' . $u[0]['channel_address']);
	}

	/*
	 * A "union" is a message which our channel has sourced from another channel.
	 * This sets up a second delivery chain just like forum tags do.
	 * Find out if this is a source-able post.
	 */

	$union = check_item_source($uid,$item);
	if($union)
		logger('check_item_source returns true');


	// This might be a followup (e.g. comment) by the original post author to a tagged forum
	// If so setup a second delivery chain

	if( ! ($item['item_flags'] & ITEM_THREAD_TOP)) {
		$x = q("select * from item where id = parent and parent = %d and uid = %d limit 1",
			intval($item['parent']),
			intval($uid)
		);

		if(($x) && ($x[0]['item_flags'] & ITEM_UPLINK)) {
			start_delivery_chain($u[0],$item,$item_id,$x[0]);
		}
	}


	/*
	 * Now we've got those out of the way. Let's see if this is a post that's tagged for re-delivery
	 */

	$terms = get_terms_oftype($item['term'],TERM_MENTION);

	if($terms)
		logger('tag_deliver: post mentions: ' . print_r($terms,true), LOGGER_DATA);

	$link = normalise_link($u[0]['xchan_url']);

	if($terms) {
		foreach($terms as $term) {
			if(link_compare($term['url'],$link)) {
				$mention = true;
				break;
			}
		}
	}

	if($mention) {
		logger('tag_deliver: mention found for ' . $u[0]['channel_name']);

		$r = q("update item set item_flags = ( item_flags | %d ) where id = %d",
			intval(ITEM_MENTIONSME),
			intval($item_id)
		);

		// At this point we've determined that the person receiving this post was mentioned in it or it is a union.
		// Now let's check if this mention was inside a reshare so we don't spam a forum
		// If it's private we may have to unobscure it momentarily so that we can parse it.

		$body = '';

		if($item['item_flags'] & ITEM_OBSCURED) {
			$key = get_config('system','prvkey');
			if($item['body'])
				$body = crypto_unencapsulate(json_decode_plus($item['body']),$key);
		}
		else
			$body = $item['body'];

		$body = preg_replace('/\[share(.*?)\[\/share\]/','',$body);

		$tagged = false;
		$plustagged = false;
		$matches = array();

		$pattern = '/@\!?\[zrl\=' . preg_quote($term['url'],'/') . '\]' . preg_quote($term['term'],'/') . '\[\/zrl\]/';
		if(preg_match($pattern,$body,$matches))
			$tagged = true;

		$pattern = '/@\!?\[zrl\=([^\]]*?)\]((?:.(?!\[zrl\=))*?)\+\[\/zrl\]/';

		if(preg_match_all($pattern,$body,$matches,PREG_SET_ORDER)) {
			$max_forums = get_config('system','max_tagged_forums');
			if(! $max_forums)
				$max_forums = 2;
			$matched_forums = 0;
			foreach($matches as $match) {
				$matched_forums ++;
				if($term['url'] === $match[1] && $term['term'] === $match[2]) {
					if($matched_forums <= $max_forums) {
						$plustagged = true;
						break;
					}
					logger('forum ' . $term['term'] . ' exceeded max_tagged_forums - ignoring');
				}
			}
		}

		if(! ($tagged || $plustagged)) {
			logger('tag_deliver: mention was in a reshare or exceeded max_tagged_forums - ignoring');
			return;
		}

		$arr = array('channel_id' => $uid, 'item' => $item, 'body' => $body);
		call_hooks('tagged',$arr);

		/*
		 * Kill two birds with one stone. As long as we're here, send a mention notification.
		 */

		require_once('include/enotify.php');
		notification(array(
			'to_xchan'     => $u[0]['channel_hash'],
			'from_xchan'   => $item['author_xchan'],
			'type'         => NOTIFY_TAGSELF,
			'item'         => $item,
			'link'         => $i[0]['llink'],
			'verb'         => ACTIVITY_TAG,
			'otype'        => 'item'
		));

		// Just a normal tag?

		if(! $plustagged) {
			logger('tag_deliver: not a plus tag', LOGGER_DEBUG);
			return;
		}

		// plustagged - keep going, next check permissions

		if(! perm_is_allowed($uid,$item['author_xchan'],'tag_deliver')) {
			logger('tag_delivery denied for uid ' . $uid . ' and xchan ' . $item['author_xchan']);
			return;
		}
	}

	if((! $mention) && (! $union)) {
		logger('tag_deliver: no mention and no union.');
		return;
	}

	// tgroup delivery - setup a second delivery chain
	// prevent delivery looping - only proceed
	// if the message originated elsewhere and is a top-level post

	if(($item['item_flags'] & ITEM_WALL)
		|| ($item['item_flags'] & ITEM_ORIGIN)
		|| (!($item['item_flags'] & ITEM_THREAD_TOP))
		|| ($item['id'] != $item['parent'])) {
		logger('tag_deliver: item was local or a comment. rejected.');
		return;
	}

	logger('tag_deliver: creating second delivery chain.');
	start_delivery_chain($u[0],$item,$item_id,null);
}

/**
 * @brief This function is called pre-deliver to see if a post matches the criteria to be tag delivered.
 *
 * We don't actually do anything except check that it matches the criteria.
 * This is so that the channel with tag_delivery enabled can receive the post even if they turn off
 * permissions for the sender to send their stream. tag_deliver() can't be called until the post is actually stored.
 * By then it would be too late to reject it.
 */
function tgroup_check($uid,$item) {

	$mention = false;

	// check that the message originated elsewhere and is a top-level post
	// or is a followup and we have already accepted the top level post as an uplink

	if($item['mid'] != $item['parent_mid']) {
		$r = q("select id from item where mid = '%s' and uid = %d and ( item_flags & %d )>0 limit 1",
			dbesc($item['parent_mid']),
			intval($uid),
			intval(ITEM_UPLINK)
		);
		if($r)
			return true;

		return false;
	}
	if(! perm_is_allowed($uid,$item['author_xchan'],'tag_deliver'))
		return false;

	$u = q("select * from channel left join xchan on channel_hash = xchan_hash where channel_id = %d limit 1",
		intval($uid)
	);

	if(! $u)
		return false;

	$terms = get_terms_oftype($item['term'],TERM_MENTION);

	if($terms)
		logger('tgroup_check: post mentions: ' . print_r($terms,true), LOGGER_DATA);

	$link = normalise_link($u[0]['xchan_url']);

	if($terms) {
		foreach($terms as $term) {
			if(link_compare($term['url'],$link)) {
				$mention = true;
				break;
			}
		}
	}

	if($mention) {
		logger('tgroup_check: mention found for ' . $u[0]['channel_name']);
	}
	else
		return false;

	// At this point we've determined that the person receiving this post was mentioned in it.
	// Now let's check if this mention was inside a reshare so we don't spam a forum
	// note: $term has been set to the matching term


	$body = $item['body'];

	if(array_key_exists('item_flags',$item) && ($item['item_flags'] & ITEM_OBSCURED) && $body) {
		$key = get_config('system','prvkey');
		$body = crypto_unencapsulate(json_decode($body,true),$key);
	}

	$body = preg_replace('/\[share(.*?)\[\/share\]/','',$body);

//	$pattern = '/@\!?\[zrl\=' . preg_quote($term['url'],'/') . '\]' . preg_quote($term['term'] . '+','/') . '\[\/zrl\]/';

	$pattern = '/@\!?\[zrl\=([^\]]*?)\]((?:.(?!\[zrl\=))*?)\+\[\/zrl\]/';

	$found = false;
	$matches = array();

	if(preg_match_all($pattern,$body,$matches,PREG_SET_ORDER)) {
		$max_forums = get_config('system','max_tagged_forums');
		if(! $max_forums)
			$max_forums = 2;
		$matched_forums = 0;
		foreach($matches as $match) {
			$matched_forums ++;
			if($term['url'] === $match[1] && $term['term'] === $match[2]) {
				if($matched_forums <= $max_forums) {
					$found = true;
					break;
				}
				logger('forum ' . $term['term'] . ' exceeded max_tagged_forums - ignoring');
			}
		}
	}

	if(! $found) {
		logger('tgroup_check: mention was in a reshare or exceeded max_tagged_forums - ignoring');
		return false;
	}

	return true;
}

/**
 * Sourced and tag-delivered posts are re-targetted for delivery to the connections of the channel
 * receiving the post. This starts the second delivery chain, by resetting permissions and ensuring
 * that ITEM_UPLINK is set on the parent post, and storing the current owner_xchan as the source_xchan.
 * We'll become the new owner. If called without $parent, this *is* the parent post.
 *
 * @param array $channel
 * @param array $item
 * @param int $item_id
 * @param boolean $parent
 */
function start_delivery_chain($channel, $item, $item_id, $parent) {

	// Change this copy of the post to a forum head message and deliver to all the tgroup members
	// also reset all the privacy bits to the forum default permissions

	$private = (($channel['channel_allow_cid'] || $channel['channel_allow_gid']
		|| $channel['channel_deny_cid'] || $channel['channel_deny_gid']) ? 1 : 0);

	$new_public_policy = map_scope($channel['channel_r_stream'],true);

	if((! $private) && $new_public_policy)
		$private = 1;

	$flag_bits = $item['item_flags'] | ITEM_WALL;

	// The message didn't necessarily originate on this site, (we'll honour it if it did),
	// but the parent post of this thread will be reset as a local post, as it is the top of
	// this delivery chain and is coming from this site, regardless of where the original
	// originated.

	if(! $parent)
		$flag_bits = $flag_bits | ITEM_ORIGIN;

	// unset the nocomment bit if it's there.

	if($flag_bits & ITEM_NOCOMMENT)
		$flag_bits = $flag_bits ^ ITEM_NOCOMMENT;

	// maintain the original source, which will be the original item owner and was stored in source_xchan
	// when we created the delivery fork

	if($parent) {
		$r = q("update item set source_xchan = '%s' where id = %d",
			dbesc($parent['source_xchan']),
			intval($item_id)
		);
	}
	else {
		$flag_bits = $flag_bits | ITEM_UPLINK;
		$r = q("update item set source_xchan = owner_xchan where id = %d",
			intval($item_id)
		);
	}

	$title = $item['title'];
	$body  = $item['body'];

	if($private) {
		if(!($flag_bits & ITEM_OBSCURED)) {
			$key = get_config('system','pubkey');
			$flag_bits = $flag_bits|ITEM_OBSCURED;
			if($title)
				$title = json_encode(crypto_encapsulate($title,$key));
			if($body)
				$body  = json_encode(crypto_encapsulate($body,$key));
		}
	}
	else {
		if($flag_bits & ITEM_OBSCURED) {
			$key = get_config('system','prvkey');
			$flag_bits = $flag_bits ^ ITEM_OBSCURED;
			if($title)
				$title = crypto_unencapsulate(json_decode($title,true),$key);
			if($body)
				$body = crypto_unencapsulate(json_decode($body,true),$key);
		}
	}

	$r = q("update item set item_flags = %d, owner_xchan = '%s', allow_cid = '%s', allow_gid = '%s',
		deny_cid = '%s', deny_gid = '%s', item_private = %d, public_policy = '%s', comment_policy = '%s', title = '%s', body = '%s'  where id = %d",
		intval($flag_bits),
		dbesc($channel['channel_hash']),
		dbesc($channel['channel_allow_cid']),
		dbesc($channel['channel_allow_gid']),
		dbesc($channel['channel_deny_cid']),
		dbesc($channel['channel_deny_gid']),
		intval($private),
		dbesc($new_public_policy),
		dbesc(map_scope($channel['channel_w_comment'])),
		dbesc($title),
		dbesc($body),
		intval($item_id)
	);

	if($r)
		proc_run('php','include/notifier.php','tgroup',$item_id);
	else
		logger('start_delivery_chain: failed to update item');
}

/**
 * @brief
 *
 * Checks to see if this item owner is referenced as a source for this channel and if the post
 * matches the rules for inclusion in this channel. Returns true if we should create a second delivery
 * chain and false if none of the rules apply, or if the item is private.
 *
 * @param int $uid
 * @param array $item
 */
function check_item_source($uid, $item) {
	$r = q("select * from source where src_channel_id = %d and ( src_xchan = '%s' or src_xchan = '*' ) limit 1",
		intval($uid),
		dbesc(($item['source_xchan']) ?  $item['source_xchan'] : $item['owner_xchan'])
	);

	if(! $r)
		return false;

	$x = q("select abook_their_perms, abook_flags from abook where abook_channel = %d and abook_xchan = '%s' limit 1",
		intval($uid),
		dbesc($item['owner_xchan'])
	);

	if(! $x)
		return false;

	if(! ($x[0]['abook_their_perms'] & PERMS_A_REPUBLISH))
		return false;

	if($item['item_private'] && (! ($x[0]['abook_flags'] & ABOOK_FLAG_FEED)))
		return false;

	if($r[0]['src_channel_xchan'] === $item['owner_xchan'])
		return false;


	// since we now have connection filters with more features, the source filter is redundant and can probably go away

	if(! $r[0]['src_patt'])
		return true;

	require_once('include/html2plain.php');
	$text = prepare_text($item['body'],$item['mimetype']);
	$text = html2plain($text);

	$tags = ((count($item['term'])) ? $item['term'] : false);

	$words = explode("\n",$r[0]['src_patt']);
	if($words) {
		foreach($words as $word) {
			if(substr($word,0,1) === '#' && $tags) {
				foreach($tags as $t)
					if(($t['type'] == TERM_HASHTAG) && (($t['term'] === substr($word,1)) || (substr($word,1) === '*')))
						return true;
			}
			elseif((strpos($word,'/') === 0) && preg_match($word,$text))
				return true;
			elseif(stristr($text,$word) !== false)
				return true;
		}
	}

	return false;
}

function post_is_importable($item,$abook) {

	if(! $abook)
		return true;

	if(($abook['abook_channel']) && (! feature_enabled($abook['abook_channel'],'connfilter')))
		return true;

	if(! $item)
		return false;

	if(! ($abook['abook_incl'] || $abook['abook_excl']))
		return true;

	require_once('include/html2plain.php');

	unobscure($item);

	$text = prepare_text($item['body'],$item['mimetype']);
	$text = html2plain($text);

	$lang = null;

	if((strpos($abook['abook_incl'],'lang=') !== false) || (strpos($abook['abook_excl'],'lang=') !== false)) {
		$lang = detect_language($text);
	}
	$tags = ((count($item['term'])) ? $item['term'] : false);

	// exclude always has priority

	$exclude = (($abook['abook_excl']) ? explode("\n",$abook['abook_excl']) : null);

	if($exclude) {
		foreach($exclude as $word) {
			$word = trim($word);
			if(substr($word,0,1) === '#' && $tags) {
				foreach($tags as $t)
					if(($t['type'] == TERM_HASHTAG) && (($t['term'] === substr($word,1)) || (substr($word,1) === '*')))
						return false;
			}
			elseif((strpos($word,'/') === 0) && preg_match($word,$text))
				return false;
			elseif((strpos($word,'lang=') === 0) && ($lang) && (strcasecmp($lang,trim(substr($word,5))) == 0))
				return false;
			elseif(stristr($text,$word) !== false)
				return false;
		}
	}

	$include = (($abook['abook_incl']) ? explode("\n",$abook['abook_incl']) : null);

	if($include) {
		foreach($include as $word) {
			$word = trim($word);
			if(substr($word,0,1) === '#' && $tags) {
				foreach($tags as $t)
					if(($t['type'] == TERM_HASHTAG) && (($t['term'] === substr($word,1)) || (substr($word,1) === '*')))
						return true;
			}
			elseif((strpos($word,'/') === 0) && preg_match($word,$text))
				return true;
			elseif((strpos($word,'lang=') === 0) && ($lang) && (strcasecmp($lang,trim(substr($word,5))) == 0))
				return true;
			elseif(stristr($text,$word) !== false)
				return true;
		}
	}
	else {
		return true;
	}

	return false;
}


function mail_store($arr) {

	if(! $arr['channel_id']) {
		logger('mail_store: no uid');
		return 0;
	}

	if((strpos($arr['body'],'<') !== false) || (strpos($arr['body'],'>') !== false))
		$arr['body'] = escape_tags($arr['body']);

	if(array_key_exists('attach',$arr) && is_array($arr['attach']))
		$arr['attach'] = json_encode($arr['attach']);

	$arr['account_id']    = ((x($arr,'account_id'))           ? intval($arr['account_id'])                 : 0);
	$arr['mid']           = ((x($arr,'mid'))           ? notags(trim($arr['mid']))           : random_string());
	$arr['from_xchan']    = ((x($arr,'from_xchan'))  ? notags(trim($arr['from_xchan']))  : '');
	$arr['to_xchan']      = ((x($arr,'to_xchan'))   ? notags(trim($arr['to_xchan']))   : '');
	$arr['created']       = ((x($arr,'created') !== false) ? datetime_convert('UTC','UTC',$arr['created']) : datetime_convert());
	$arr['expires']       = ((x($arr,'expires') !== false) ? datetime_convert('UTC','UTC',$arr['expires']) : NULL_DATE);
	$arr['title']         = ((x($arr,'title'))         ? notags(trim($arr['title']))         : '');
	$arr['parent_mid']    = ((x($arr,'parent_mid'))    ? notags(trim($arr['parent_mid']))    : '');
	$arr['body']          = ((x($arr,'body'))          ? trim($arr['body'])                  : '');

	$arr['mail_flags']    = ((x($arr,'mail_flags'))    ? intval($arr['mail_flags'])          : 0 );

	if(! $arr['parent_mid']) {
		logger('mail_store: missing parent');
		$arr['parent_mid'] = $arr['mid'];
	}

	$r = q("SELECT `id` FROM mail WHERE `mid` = '%s' AND channel_id = %d LIMIT 1",
		dbesc($arr['mid']),
		intval($arr['channel_id'])
	);
	if($r) {
		logger('mail_store: duplicate item ignored. ' . print_r($arr,true));
		return 0;
	}

	call_hooks('post_mail',$arr);

	if(x($arr,'cancel')) {
		logger('mail_store: post cancelled by plugin.');
		return 0;
	}

	dbesc_array($arr);

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

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

	// find the item we just created

	$r = q("SELECT `id` FROM mail WHERE `mid` = '%s' AND `channel_id` = %d ORDER BY `id` ASC ",
		$arr['mid'],           // already dbesc'd
		intval($arr['channel_id'])
	);

	if($r) {
		$current_post = $r[0]['id'];
		logger('mail_store: created item ' . $current_post, LOGGER_DEBUG);
		$arr['id'] = $current_post; // for notification
	}
	else {
		logger('mail_store: could not locate created item');
		return 0;
	}
	if(count($r) > 1) {
		logger('mail_store: duplicated post occurred. Removing duplicates.');
		q("DELETE FROM mail WHERE `mid` = '%s' AND `channel_id` = %d AND `id` != %d ",
			$arr['mid'],
			intval($arr['channel_id']),
			intval($current_post)
		);
	}
	else {
		require_once('include/enotify.php');

		$notif_params = array(
			'from_xchan' => $arr['from_xchan'],
			'to_xchan'   => $arr['to_xchan'],
			'type'       => NOTIFY_MAIL,
			'item'       => $arr,
			'verb'       => ACTIVITY_POST,
			'otype'      => 'mail'
		);

		notification($notif_params);
	}

	call_hooks('post_mail_end',$arr);
	return $current_post;
}

/**
 * @brief Process atom feed and update anything/everything we might need to update.
 *
 * $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.
 * $datedir sorts in reverse order
 *
 * @param array $xml
 *   The (atom) feed to consume - RSS isn't as fully supported but may work for simple feeds.
 * @param $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.
 * @param $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.
 * @param int $pass by default ($pass = 0) we cannot guarantee that a parent item has been
 *   imported prior to its children being seen in the stream unless we are certain
 *   of how the feed is arranged/ordered.
 *  * With $pass = 1, we only pull parent items out of the stream.
 *  * With $pass = 2, we only pull children (comments/likes).
 *
 * So running this twice, first with pass 1 and then with pass 2 will do the right
 * thing regardless of feed ordering. This won't be adequate in a fully-threaded
 * model where comments can have sub-threads. That would require some massive sorting
 * to get all the feed items into a mostly linear ordering, and might still require
 * recursion.
 */
function consume_feed($xml, $importer, &$contact, $pass = 0) {

	require_once('library/simplepie/simplepie.inc');

	if(! strlen($xml)) {
		logger('consume_feed: empty input');
		return;
	}

	$feed = new SimplePie();
	$feed->set_raw_data($xml);
	$feed->init();

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

	$permalink = $feed->get_permalink();

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

	// process any deleted entries

	$del_entries = $feed->get_feed_tags(NAMESPACE_TOMB, 'deleted-entry');
	if(is_array($del_entries) && count($del_entries) && $pass != 2) {
		foreach($del_entries as $dentry) {
			$deleted = false;
			if(isset($dentry['attribs']['']['ref'])) {
				$mid = $dentry['attribs']['']['ref'];
				$deleted = true;
				if(isset($dentry['attribs']['']['when'])) {
					$when = $dentry['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)) {
				$r = q("SELECT * from item where mid = '%s' and author_xchan = '%s' and uid = %d limit 1",
					dbesc(base64url_encode($mid)),
					dbesc($contact['xchan_hash']),
					intval($importer['channel_id'])
				);

				if($r) {
					$item = $r[0];

					if(! ($item['item_restrict'] & ITEM_DELETED)) {
						logger('consume_feed: deleting item ' . $item['id'] . ' mid=' . base64url_decode($item['mid']), LOGGER_DEBUG);
						drop_item($item['id'],false);
					}
				}
			}
		}
	}

	// Now process the feed

	if($feed->get_item_quantity()) {

		logger('consume_feed: feed item count = ' . $feed->get_item_quantity(), LOGGER_DEBUG);

		$items = $feed->get_items();

		foreach($items as $item) {

			$is_reply = false;
			$item_id = base64url_encode($item->get_id());

			logger('consume_feed: processing ' . $item_id, LOGGER_DEBUG);

			$rawthread = $item->get_item_tags( NAMESPACE_THREAD,'in-reply-to');
			if(isset($rawthread[0]['attribs']['']['ref'])) {
				$is_reply = true;
				$parent_mid = base64url_encode($rawthread[0]['attribs']['']['ref']);
			}

			if($is_reply) {

				if($pass == 1)
					continue;

				// Have we seen it? If not, import it.

				$item_id  = base64url_encode($item->get_id());
				$author = array();
				$datarray = get_atom_elements($feed,$item,$author);

				if((! x($author,'author_name')) || ($author['author_is_feed']))
					$author['author_name'] = $contact['xchan_name'];
				if((! x($author,'author_link')) || ($author['author_is_feed']))
					$author['author_link'] = $contact['xchan_url'];
				if((! x($author,'author_photo'))|| ($author['author_is_feed']))
					$author['author_photo'] = $contact['xchan_photo_m'];

				$datarray['author_xchan'] = '';

				if($author['author_link'] != $contact['xchan_url']) {
					$x = import_author_unknown(array('name' => $author['author_name'],'url' => $author['author_link'],'photo' => array('src' => $author['author_photo'])));
					if($x)
						$datarray['author_xchan'] = $x;
				}
				if(! $datarray['author_xchan'])
					$datarray['author_xchan'] = $contact['xchan_hash'];

				$datarray['owner_xchan'] = $contact['xchan_hash'];

				$r = q("SELECT edited FROM item WHERE mid = '%s' AND uid = %d LIMIT 1",
					dbesc($item_id),
					intval($importer['channel_id'])
				);

				// Update content if 'updated' changes

				if($r) {
					if((x($datarray,'edited') !== false)
						&& (datetime_convert('UTC','UTC',$datarray['edited']) !== $r[0]['edited'])) {

						// do not accept (ignore) an earlier edit than one we currently have.
						if(datetime_convert('UTC','UTC',$datarray['edited']) < $r[0]['edited'])
							continue;

						update_feed_item($importer['channel_id'],$datarray);
					}
					continue;
				}

				$datarray['parent_mid'] = $parent_mid;
				$datarray['uid'] = $importer['channel_id'];

				logger('consume_feed: ' . print_r($datarray,true),LOGGER_DATA);

				$xx = item_store($datarray);
				$r = $xx['item_id'];
				continue;
			}
			else {

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

				$item_id  = base64url_encode($item->get_id());
				$author = array();
				$datarray = get_atom_elements($feed,$item,$author);

				if(is_array($contact)) {
					if((! x($author,'author_name')) || ($author['author_is_feed']))
						$author['author_name'] = $contact['xchan_name'];
					if((! x($author,'author_link')) || ($author['author_is_feed']))
						$author['author_link'] = $contact['xchan_url'];
					if((! x($author,'author_photo'))|| ($author['author_is_feed']))
						$author['author_photo'] = $contact['xchan_photo_m'];
				}

				if((! x($author,'author_name')) || (! x($author,'author_link'))) {
					logger('consume_feed: no author information! ' . print_r($author,true));
					continue;
				}

				$datarray['author_xchan'] = '';

				if($author['author_link'] != $contact['xchan_url']) {
					$x = import_author_unknown(array('name' => $author['author_name'],'url' => $author['author_link'],'photo' => array('src' => $author['author_photo'])));
					if($x)
						$datarray['author_xchan'] = $x;
				}
				if(! $datarray['author_xchan'])
					$datarray['author_xchan'] = $contact['xchan_hash'];

				$datarray['owner_xchan'] = $contact['xchan_hash'];

				$r = q("SELECT edited FROM item WHERE mid = '%s' AND uid = %d LIMIT 1",
					dbesc($item_id),
					intval($importer['channel_id'])
				);

				// Update content if 'updated' changes

				if($r) {
					if((x($datarray,'edited') !== false)
						&& (datetime_convert('UTC','UTC',$datarray['edited']) !== $r[0]['edited'])) {

						// do not accept (ignore) an earlier edit than one we currently have.
						if(datetime_convert('UTC','UTC',$datarray['edited']) < $r[0]['edited'])
							continue;

						update_feed_item($importer['channel_id'],$datarray);
					}

					continue;
				}

				$datarray['parent_mid'] = $item_id;
				$datarray['uid'] = $importer['channel_id'];

				if(! link_compare($author['owner_link'],$contact['xchan_url'])) {
					logger('consume_feed: Correcting item owner.', LOGGER_DEBUG);
					$author['owner_name']   = $contact['name'];
					$author['owner_link']   = $contact['url'];
					$author['owner_avatar'] = $contact['thumb'];
				}

				if(! post_is_importable($datarray,$contact))
					continue;

				logger('consume_feed: author ' . print_r($author,true),LOGGER_DEBUG);

				logger('consume_feed: ' . print_r($datarray,true),LOGGER_DATA);

				$xx = item_store($datarray);
				$r = $xx['item_id'];
				continue;
			}
		}
	}
}

function update_feed_item($uid,$datarray) {
	logger('update_feed_item: not implemented! ' . $uid . ' ' . print_r($datarray,true), LOGGER_DATA);
}


function handle_feed($uid,$abook_id,$url) {

	require_once('include/Contact.php');
	$channel = channelx_by_n($uid);
	if(! $channel)
		return;

	$x = q("select * from abook left join xchan on abook_xchan = xchan_hash where abook_id = %d and abook_channel = %d limit 1",
		dbesc($abook_id),
		intval($uid)
	);

	$recurse = 0;
	$z = z_fetch_url($url,false,$recurse,array('novalidate' => true));

//logger('handle_feed:' . print_r($z,true));

	if($z['success']) {
		consume_feed($z['body'],$channel,$x[0],0);
		consume_feed($z['body'],$channel,$x[0],1);
	}
}


function atom_author($tag,$name,$uri,$h,$w,$type,$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="' . $type . '" media:width="' . $w . '" media:height="' . $h . '" href="' . $photo . '" />' . "\r\n";
	$o .= '<link rel="avatar" type="' . $type . '" 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,$comment = false,$cid = 0) {

	if(! $item['parent'])
		return;

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


	if($item['allow_cid'] || $item['allow_gid'] || $item['deny_cid'] || $item['deny_gid'])
		$body = fix_private_photos($item['body'],$owner['uid'],$item,$cid);
	else
		$body = $item['body'];

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

	if(is_array($author))
		$o .= atom_author('author',$author['xchan_name'],$author['xchan_url'],80,80,$author['xchan_photo_mimetype'],$author['xchan_photo_m']);
	else
		$o .= atom_author('author',$item['author']['xchan_name'],$item['author']['xchan_url'],80,80,$item['author']['xchan_photo_mimetype'], $item['author']['xchan_photo_m']);

	$o .= atom_author('zot:owner',$item['owner']['xchan_name'],$item['owner']['xchan_url'],80,80,$item['owner']['xchan_photo_mimetype'],$item['owner']['xchan_photo_m']);

	if(($item['parent'] != $item['id']) || ($item['parent_mid'] !== $item['mid']) || (($item['thr_parent'] !== '') && ($item['thr_parent'] !== $item['mid']))) {
		$parent_item = (($item['thr_parent']) ? $item['thr_parent'] : $item['parent_mid']);
		$o .= '<thr:in-reply-to ref="' . xmlify($parent_item) . '" type="text/html" href="' .  xmlify($item['plink']) . '" />' . "\r\n";
	}

	$o .= '<id>' . xmlify($item['mid']) . '</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="' . $type . '" >' . xmlify(prepare_text($body,$item['mimetype'])) . '</content>' . "\r\n";
	$o .= '<link rel="alternate" type="text/html" href="' . xmlify($item['plink']) . '" />' . "\r\n";

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

	if($item['app'])
		$o .= '<statusnet:notice_info local_id="' . $item['id'] . '" source="' . xmlify($item['app']) . '" ></statusnet:notice_info>' . "\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;

	// FIXME
//	$tags = item_getfeedtags($item);
//	if(count($tags)) {
//		foreach($tags as $t) {
//			$o .= '<category scheme="X-DFRN:' . xmlify($t[0]) . ':' . xmlify($t[1]) . '" term="' . xmlify($t[2]) . '" />' . "\r\n";
//		}
//	}

// FIXME
//	$o .= item_getfeedattach($item);

//	$mentioned = get_mentions($item,$tags);
//	if($mentioned)
//		$o .= $mentioned;

	call_hooks('atom_entry', $o);

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

	return $o;
}

function fix_private_photos($s, $uid, $item = null, $cid = 0) {
	$a = get_app();

	logger('fix_private_photos', LOGGER_DEBUG);
	$site = substr($a->get_baseurl(),strpos($a->get_baseurl(),'://'));

	$orig_body = $s;
	$new_body = '';

	$img_start = strpos($orig_body, '[zmg');
	$img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
	$img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/zmg]') : false);
	while( ($img_st_close !== false) && ($img_len !== false) ) {

		$img_st_close++; // make it point to AFTER the closing bracket
		$image = substr($orig_body, $img_start + $img_st_close, $img_len);

		logger('fix_private_photos: found photo ' . $image, LOGGER_DEBUG);

		if(stristr($image , $site . '/photo/')) {
			// Only embed locally hosted photos
			$replace = false;
			$i = basename($image);
			$x = strpos($i,'-');

			if($x) {
				$res = substr($i,$x+1);
				$i = substr($i,0,$x);
				$r = q("SELECT * FROM `photo` WHERE `resource_id` = '%s' AND `scale` = %d AND `uid` = %d",
					dbesc($i),
					intval($res),
					intval($uid)
				);
				if(count($r)) {

					// Check to see if we should replace this photo link with an embedded image
					// 1. No need to do so if the photo is public
					// 2. If there's a contact-id provided, see if they're in the access list
					//    for the photo. If so, embed it.
					// 3. Otherwise, if we have an item, see if the item permissions match the photo
					//    permissions, regardless of order but first check to see if they're an exact
					//    match to save some processing overhead.

					if(has_permissions($r[0])) {
						if($cid) {
							$recips = enumerate_permissions($r[0]);
							if(in_array($cid, $recips)) {
								$replace = true;
							}
						}
						elseif($item) {
							if(compare_permissions($item,$r[0]))
								$replace = true;
						}
					}
					if($replace) {
						$data = $r[0]['data'];
						$type = $r[0]['type'];

						// If a custom width and height were specified, apply before embedding
						if(preg_match("/\[zmg\=([0-9]*)x([0-9]*)\]/is", substr($orig_body, $img_start, $img_st_close), $match)) {
							logger('fix_private_photos: scaling photo', LOGGER_DEBUG);

							$width = intval($match[1]);
							$height = intval($match[2]);

							$ph = photo_factory($data, $type);
							if($ph->is_valid()) {
								$ph->scaleImage(max($width, $height));
								$data = $ph->imageString();
								$type = $ph->getType();
							}
						}

						logger('fix_private_photos: replacing photo', LOGGER_DEBUG);
						$image = 'data:' . $type . ';base64,' . base64_encode($data);
						logger('fix_private_photos: replaced: ' . $image, LOGGER_DATA);
					}
				}
			}
		}

		$new_body = $new_body . substr($orig_body, 0, $img_start + $img_st_close) . $image . '[/zmg]';
		$orig_body = substr($orig_body, $img_start + $img_st_close + $img_len + strlen('[/zmg]'));
		if($orig_body === false)
			$orig_body = '';

		$img_start = strpos($orig_body, '[zmg');
		$img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
		$img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/zmg]') : false);
	}

	$new_body = $new_body . $orig_body;

	return($new_body);
}


function has_permissions($obj) {
	if(($obj['allow_cid'] != '') || ($obj['allow_gid'] != '') || ($obj['deny_cid'] != '') || ($obj['deny_gid'] != ''))
		return true;

	return false;
}

function compare_permissions($obj1,$obj2) {
	// first part is easy. Check that these are exactly the same.
	if(($obj1['allow_cid'] == $obj2['allow_cid'])
		&& ($obj1['allow_gid'] == $obj2['allow_gid'])
		&& ($obj1['deny_cid'] == $obj2['deny_cid'])
		&& ($obj1['deny_gid'] == $obj2['deny_gid']))
		return true;

	// This is harder. Parse all the permissions and compare the resulting set.

	$recipients1 = enumerate_permissions($obj1);
	$recipients2 = enumerate_permissions($obj2);
	sort($recipients1);
	sort($recipients2);
	if($recipients1 == $recipients2)
		return true;
	return false;
}

/**
 * @brief Returns an array of contact-ids that are allowed to see this object.
 *
 * @param object $obj
 * @return array
 */
function enumerate_permissions($obj) {
	require_once('include/group.php');

	$allow_people = expand_acl($obj['allow_cid']);
	$allow_groups = expand_groups(expand_acl($obj['allow_gid']));
	$deny_people  = expand_acl($obj['deny_cid']);
	$deny_groups  = expand_groups(expand_acl($obj['deny_gid']));
	$recipients   = array_unique(array_merge($allow_people,$allow_groups));
	$deny         = array_unique(array_merge($deny_people,$deny_groups));
	$recipients   = array_diff($recipients,$deny);

	return $recipients;
}

function item_getfeedtags($item) {

	$terms = get_terms_oftype($item['term'],array(TERM_HASHTAG,TERM_MENTION));
	$ret = array();

	if(count($terms)) {
		foreach($terms as $term) {
			if($term['type'] == TERM_HASHTAG)
				$ret[] = array('#',$term['url'],$term['term']);
			else
				$ret[] = array('@',$term['url'],$term['term']);
		}
	}

	return $ret;
}

function item_getfeedattach($item) {
	$ret = '';
	$arr = explode(',',$item['attach']);
	if(count($arr)) {
		foreach($arr as $r) {
			$matches = false;
			$cnt = preg_match('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"\[\/attach\]|',$r,$matches);
			if($cnt) {
				$ret .= '<link rel="enclosure" href="' . xmlify($matches[1]) . '" type="' . xmlify($matches[3]) . '" ';
				if(intval($matches[2]))
					$ret .= 'length="' . intval($matches[2]) . '" ';
				if($matches[4] !== ' ')
					$ret .= 'title="' . xmlify(trim($matches[4])) . '" ';
				$ret .= ' />' . "\r\n";
			}
		}
	}

	return $ret;
}


function item_expire($uid,$days) {

	if((! $uid) || ($days < 1))
		return;

	// $expire_network_only = save your own wall posts
	// and just expire conversations started by others
	// do not enable this until we can pass bulk delete messages through zot
	//	$expire_network_only = get_pconfig($uid,'expire','network_only');

	$expire_network_only = 1;

	$expire_limit = get_config('system','expire_limit');
	if(! intval($expire_limit))
		$expire_limit = 5000;

	$sql_extra = ((intval($expire_network_only)) ? " AND (item_flags & " . intval(ITEM_WALL) . ") = 0 " : "");

	$r = q("SELECT * FROM `item`
		WHERE `uid` = %d
		AND `created` < %s - INTERVAL %s
		AND `id` = `parent`
		$sql_extra
		AND ( item_flags & %d ) = 0
		AND ( item_restrict = 0 ) LIMIT $expire_limit ",
		intval($uid),
		db_utcnow(), db_quoteinterval(intval($days).' DAY'),
		intval(ITEM_RETAINED)
	);

	if(! $r)
		return;

	$r = fetch_post_tags($r,true);

	foreach($r as $item) {

		// don't expire filed items

		$terms = get_terms_oftype($item['term'],TERM_FILE);
		if($terms) {
			retain_item($item['id']);
			continue;
		}

		// Only expire posts, not photos and photo comments

		if($item['resource_type'] === 'photo') {
			retain_item($item['id']);
			continue;
		}
		if($item['item_flags'] & ITEM_STARRED) {
			retain_item($item['id']);
			continue;
		}

		drop_item($item['id'],false);
	}

//	proc_run('php',"include/notifier.php","expire","$uid");
}

function retain_item($id) {
	$r = q("update item set item_flags = (item_flags | %d ) where id = %d",
		intval(ITEM_RETAINED),
		intval($id)
	);
}

function drop_items($items) {
	$uid = 0;

	if(! local_channel() && ! remote_channel())
		return;

	if(count($items)) {
		foreach($items as $item) {
			$owner = drop_item($item,false);
			if($owner && ! $uid)
				$uid = $owner;
		}
	}

	// multiple threads may have been deleted, send an expire notification

	if($uid)
		proc_run('php',"include/notifier.php","expire","$uid");
}


// Delete item with given item $id. $interactive means we're running interactively, and must check
// permissions to carry out this act. If it is non-interactive, we are deleting something at the
// system's request and do not check permission. This is very important to know.

// Some deletion requests (those coming from remote sites) must be staged.
// $stage = 0 => unstaged
// $stage = 1 => set deleted flag on the item and perform intial notifications
// $stage = 2 => perform low level delete at a later stage

function drop_item($id,$interactive = true,$stage = DROPITEM_NORMAL,$force = false) {

	$a = get_app();

	// locate item to be deleted

	$r = q("SELECT * FROM item WHERE id = %d LIMIT 1",
		intval($id)
	);

	if((! $r) || (($r[0]['item_restrict'] & ITEM_DELETED) && ($stage === DROPITEM_NORMAL))) {
		if(! $interactive)
			return 0;
		notice( t('Item not found.') . EOL);
		goaway($a->get_baseurl() . '/' . $_SESSION['return_url']);
	}

	$item = $r[0];

	$linked_item = (($item['resource_id']) ? true : false);

	$ok_to_delete = false;

	// system deletion
	if(! $interactive)
		$ok_to_delete = true;

	// owner deletion
	if(local_channel() && local_channel() == $item['uid'])
		$ok_to_delete = true;

	// sys owned item, requires site admin to delete
	$sys = get_sys_channel();
	if(is_site_admin() && $sys['channel_id'] == $item['uid'])
		$ok_to_delete = true;

	// author deletion
	$observer = $a->get_observer();
	if($observer && $observer['xchan_hash'] && ($observer['xchan_hash'] === $item['author_xchan']))
		$ok_to_delete = true;

	if($ok_to_delete) {

		// set the deleted flag immediately on this item just in case the
		// hook calls a remote process which loops. We'll delete it properly in a second.

		$r = q("UPDATE item SET item_restrict = ( item_restrict | %d ) WHERE id = %d",
			intval(($linked_item && ! $force) ? ITEM_HIDDEN : ITEM_DELETED),
			intval($item['id'])
		);

		$arr = array('item' => $item, 'interactive' => $interactive, 'stage' => $stage);
		call_hooks('drop_item', $arr );

		$notify_id = intval($item['id']);

		$items = q("select * from item where parent = %d and uid = %d",
			intval($item['id']),
			intval($item['uid'])
		);
		if($items) {
			foreach($items as $i)
				delete_item_lowlevel($i,$stage,$force);
		}
		else
			delete_item_lowlevel($item,$stage,$force);

		if(! $interactive)
			return 1;

		// send the notification upstream/downstream as the case may be
		// only send notifications to others if this is the owner's wall item.

		// This isn't optimal. We somehow need to pass to this function whether or not
		// to call the notifier, or we need to call the notifier from the calling function.
		// We'll rely on the undocumented behaviour that DROPITEM_PHASE1 is (hopefully) only
		// set if we know we're going to send delete notifications out to others.

		if((($item['item_flags'] & ITEM_WALL) && ($stage != DROPITEM_PHASE2)) || ($stage == DROPITEM_PHASE1))
			proc_run('php','include/notifier.php','drop',$notify_id);

		goaway($a->get_baseurl() . '/' . $_SESSION['return_url']);
	}
	else {
		if(! $interactive)
			return 0;
		notice( t('Permission denied.') . EOL);
		goaway($a->get_baseurl() . '/' . $_SESSION['return_url']);
	}
}

/**
 * @warning This function does not check for permission and does not send
 * notifications and does not check recursion.
 * It merely destroys all resources associated with an item.
 * Please do not use without a suitable wrapper.
 *
 * @param array $item
 * @param int $stage
 * @param boolean $force
 * @return boolean
 */
function delete_item_lowlevel($item, $stage = DROPITEM_NORMAL, $force = false) {

	$linked_item = (($item['resource_id']) ? true : false);

	logger('item: ' . $item . ' stage: ' . $stage . ' force: ' . $force, LOGGER_DATA);

	switch($stage) {
		case DROPITEM_PHASE2:
			$r = q("UPDATE item SET item_restrict = ( item_restrict | %d ), body = '', title = '',
				changed = '%s', edited = '%s'  WHERE id = %d",
				intval(ITEM_PENDING_REMOVE),
				dbesc(datetime_convert()),
				dbesc(datetime_convert()),
				intval($item['id'])
			);
			break;

		case DROPITEM_PHASE1:
			$r = q("UPDATE item SET item_restrict = ( item_restrict | %d ),
				changed = '%s', edited = '%s'  WHERE id = %d",
				intval(($linked_item && ! $force) ? ITEM_HIDDEN : ITEM_DELETED),
				dbesc(datetime_convert()),
				dbesc(datetime_convert()),
				intval($item['id'])
			);
			break;

		case DROPITEM_NORMAL:
		default:
			if($linked_item && ! $force) {
				$r = q("UPDATE item SET item_restrict = ( item_restrict | %d ),
					changed = '%s', edited = '%s'  WHERE id = %d",
					intval(ITEM_HIDDEN),
					dbesc(datetime_convert()),
					dbesc(datetime_convert()),
					intval($item['id'])
				);
			}
			else {
				$r = q("UPDATE item SET item_restrict = ( item_restrict | %d ), body = '', title = '',
					changed = '%s', edited = '%s'  WHERE id = %d",
					intval(ITEM_DELETED),
					dbesc(datetime_convert()),
					dbesc(datetime_convert()),
					intval($item['id'])
				);
			}
			break;
	}

	// immediately remove any undesired profile likes.

	q("delete from likes where iid = %d and channel_id = %d",
		intval($item['id']),
		intval($item['uid'])
	);

	// network deletion request. Keep the message structure so that we can deliver delete notifications.
	// Come back after several days (or perhaps a month) to do the lowlevel delete (DROPITEM_PHASE2).

	if($stage == DROPITEM_PHASE1)
		return true;

	$r = q("delete from term where otype = %d and oid = %d",
		intval(TERM_OBJ_POST),
		intval($item['id'])
	);

	q("delete from item_id where iid = %d and uid = %d",
		intval($item['id']),
		intval($item['uid'])
	);

	q("delete from term where oid = %d and otype = %d",
		intval($item['id']),
		intval(TERM_OBJ_POST)
	);

	/** @FIXME remove notifications for this item */

	return true;
}


function first_post_date($uid,$wall = false) {

	$wall_sql = (($wall) ? sprintf(" and (item_flags & %d)>0 ", ITEM_WALL) : "" );

	$r = q("select id, created from item
		where item_restrict = %d and uid = %d and id = parent $wall_sql
		order by created asc limit 1",
		intval(ITEM_VISIBLE),
		intval($uid)

	);
	if($r) {
//		logger('first_post_date: ' . $r[0]['id'] . ' ' . $r[0]['created'], LOGGER_DATA);
		return substr(datetime_convert('',date_default_timezone_get(),$r[0]['created']),0,10);
	}

	return false;
}

/**
 * modified posted_dates() {below} to arrange the list in years, which we'll eventually
 * use to make a menu of years with collapsible sub-menus for the months instead of the
 * current flat list of all representative dates.
 *
 * @param int $uid
 * @param unknown $wall
 * @param unknown $mindate
 * @return array
 */
function list_post_dates($uid, $wall, $mindate) {
	$dnow = datetime_convert('',date_default_timezone_get(),'now','Y-m-d');

	if($mindate)
		$dthen = datetime_convert('',date_default_timezone_get(), $mindate);
	else
		$dthen = first_post_date($uid, $wall);
	if(! $dthen)
		return array();

	// If it's near the end of a long month, backup to the 28th so that in
	// consecutive loops we'll always get a whole month difference.

	if(intval(substr($dnow,8)) > 28)
		$dnow = substr($dnow,0,8) . '28';
	if(intval(substr($dthen,8)) > 28)
		$dthen = substr($dthen,0,8) . '28';

	$ret = array();
	// Starting with the current month, get the first and last days of every
	// month down to and including the month of the first post
	while(substr($dnow, 0, 7) >= substr($dthen, 0, 7)) {
		$dyear = intval(substr($dnow,0,4));
		$dstart = substr($dnow,0,8) . '01';
		$dend = substr($dnow,0,8) . get_dim(intval($dnow),intval(substr($dnow,5)));
		$start_month = datetime_convert('','',$dstart,'Y-m-d');
		$end_month = datetime_convert('','',$dend,'Y-m-d');
		$str = day_translate(datetime_convert('','',$dnow,'F'));
		if(! $ret[$dyear])
			$ret[$dyear] = array();
 		$ret[$dyear][] = array($str,$end_month,$start_month);
		$dnow = datetime_convert('','',$dnow . ' -1 month', 'Y-m-d');
	}

	return $ret;
}


function posted_dates($uid,$wall) {
	$dnow = datetime_convert('',date_default_timezone_get(),'now','Y-m-d');

	$dthen = first_post_date($uid,$wall);
	if(! $dthen)
		return array();

	// If it's near the end of a long month, backup to the 28th so that in
	// consecutive loops we'll always get a whole month difference.

	if(intval(substr($dnow,8)) > 28)
		$dnow = substr($dnow,0,8) . '28';
	if(intval(substr($dthen,8)) > 28)
		$dthen = substr($dthen,0,8) . '28';

	$ret = array();
	// Starting with the current month, get the first and last days of every
	// month down to and including the month of the first post
	while(substr($dnow, 0, 7) >= substr($dthen, 0, 7)) {
		$dstart = substr($dnow,0,8) . '01';
		$dend = substr($dnow,0,8) . get_dim(intval($dnow),intval(substr($dnow,5)));
		$start_month = datetime_convert('','',$dstart,'Y-m-d');
		$end_month = datetime_convert('','',$dend,'Y-m-d');
		$str = day_translate(datetime_convert('','',$dnow,'F Y'));
 		$ret[] = array($str,$end_month,$start_month);
		$dnow = datetime_convert('','',$dnow . ' -1 month', 'Y-m-d');
	}
	return $ret;
}


function fetch_post_tags($items,$link = false) {

	$tag_finder = array();
	if($items) {
		foreach($items as $item) {
			if(is_array($item)) {
				if(array_key_exists('item_id',$item)) {
					if(! in_array($item['item_id'],$tag_finder))
						$tag_finder[] = $item['item_id'];
				}
				else {
					if(! in_array($item['id'],$tag_finder))
						$tag_finder[] = $item['id'];
				}
			}
		}
	}
	$tag_finder_str = implode(', ', $tag_finder);


	if(strlen($tag_finder_str)) {
		$tags = q("select * from term where oid in ( %s ) and otype = %d",
			dbesc($tag_finder_str),
			intval(TERM_OBJ_POST)
		);
	}

	for($x = 0; $x < count($items); $x ++) {
		if($tags) {
			foreach($tags as $t) {
				if(($link) && ($t['type'] == TERM_MENTION))
					$t['url'] = chanlink_url($t['url']);
				if(array_key_exists('item_id',$items[$x])) {
					if($t['oid'] == $items[$x]['item_id']) {
						if(! is_array($items[$x]['term']))
							$items[$x]['term'] = array();
						$items[$x]['term'][] = $t;
					}
				}
				else {
					if($t['oid'] == $items[$x]['id']) {
						if(! is_array($items[$x]['term']))
							$items[$x]['term'] = array();
						$items[$x]['term'][] = $t;
					}
				}
			}
		}
	}

	return $items;
}



function zot_feed($uid,$observer_hash,$arr) {

	$result = array();
	$mindate = null;
	$message_id = null;

	require_once('include/security.php');

	if(array_key_exists('mindate',$arr)) {
		$mindate = datetime_convert('UTC','UTC',$arr['mindate']);
	}

	if(array_key_exists('message_id',$arr)) {
		$message_id = $arr['message_id'];
	}

	if(! $mindate)
		$mindate = NULL_DATE;

	$mindate = dbesc($mindate);

	logger('zot_feed: requested for uid ' . $uid . ' from observer ' . $observer_hash, LOGGER_DEBUG);
	if($message_id)
		logger('message_id: ' . $message_id,LOGGER_DEBUG);

	if(! perm_is_allowed($uid,$observer_hash,'view_stream')) {
		logger('zot_feed: permission denied.');
		return $result;
	}

	if(! is_sys_channel($uid))
		$sql_extra = item_permissions_sql($uid,$observer_hash);

	$limit = " LIMIT 100 ";

	if($mindate != NULL_DATE) {
		$sql_extra .= " and ( created > '$mindate' or changed > '$mindate' ) ";
	}

	if($message_id) {
		$sql_extra .= " and mid = '" . dbesc($message_id) . "' ";
		$limit = '';
	}


	$items = array();

	/** @FIXME re-unite these SQL statements. There is no need for them to be separate. The mySQL is convoluted with misuse of group by. As it stands, there is a slight difference where the postgres version doesn't remove the duplicate parents up to 100. In practice this doesn't matter. It could be made to match behavior by adding "distinct on (parent) " to the front of the selection list, at a not-worth-it performance penalty (page temp results to disk). duplicates are still ignored in the in() clause, you just get less than 100 parents if there are many children. */

	if(ACTIVE_DBTYPE == DBTYPE_POSTGRES) {
		$groupby = '';
	} else {
		$groupby = 'GROUP BY parent';
	}

	if(is_sys_channel($uid)) {
		$r = q("SELECT parent, created, postopts from item
			WHERE uid != %d
			AND item_private = 0 AND item_restrict = 0 AND uid in (" . stream_perms_api_uids(PERMS_PUBLIC,10,1) . ")
			AND (item_flags &  %d) > 0
			$sql_extra $groupby ORDER BY created ASC $limit",
			intval($uid),
			intval(ITEM_WALL)
		);
	}
	else {
		$r = q("SELECT parent, created, postopts from item
			WHERE uid = %d AND item_restrict = 0
			AND (item_flags &  %d) > 0
			$sql_extra $groupby ORDER BY created ASC $limit",
			intval($uid),
			intval(ITEM_WALL)
		);
	}

	if($r) {
		for($x = 0; $x < count($r); $x ++) {
			if(strpos($r[$x]['postopts'],'nodeliver') !== false) {
				unset($r[$x]);
			}
		}
	
		$parents_str = ids_to_querystr($r,'parent');
		$sys_query = ((is_sys_channel($uid)) ? $sql_extra : '');

		$items = q("SELECT `item`.*, `item`.`id` AS `item_id` FROM `item`
			WHERE `item`.`item_restrict` = 0
			AND `item`.`parent` IN ( %s ) $sys_query ",
			dbesc($parents_str)
		);
	}

	if($items) {
		xchan_query($items);
		$items = fetch_post_tags($items);
		require_once('include/conversation.php');
		$items = conv_sort($items,'ascending');
	}
	else
		$items = array();

	logger('zot_feed: number items: ' . count($items),LOGGER_DEBUG);

	foreach($items as $item)
		$result[] = encode_item($item);

	return $result;
}



function items_fetch($arr,$channel = null,$observer_hash = null,$client_mode = CLIENT_MODE_NORMAL,$module = 'network') {

	$result = array('success' => false);

	$a = get_app();

	$sql_extra = '';
	$sql_nets = '';
	$sql_options = '';
	$sql_extra2 = '';
	$sql_extra3 = '';
	$def_acl = '';

	$item_uids = ' true ';

	if ($arr['uid']) $uid= $arr['uid'];

	if($channel) {
		$uid = $channel['channel_id'];
		$uidhash = $channel['channel_hash'];
		$item_uids = " item.uid = " . intval($uid) . " ";
	}

	if($arr['star'])
		$sql_options .= " and (item_flags & " . intval(ITEM_STARRED) . ")>0 ";

	if($arr['wall'])
		$sql_options .= " and (item_flags & " . intval(ITEM_WALL) . ")>0 ";

	$sql_extra = " AND item.parent IN ( SELECT parent FROM item WHERE (item_flags & " . intval(ITEM_THREAD_TOP) . ")>0 $sql_options ) ";

	if($arr['since_id'])
		$sql_extra .= " and item.id > " . $since_id . " ";

	if($arr['gid'] && $uid) {
		$r = q("SELECT * FROM `groups` WHERE id = %d AND uid = %d LIMIT 1",
			intval($arr['group']),
			intval($uid)
		);
		if(! $r) {
			$result['message']  = t('Collection not found.');
			return $result;
		}

		$contact_str = '';
		/** @FIXME $group is undefined */
		$contacts = group_get_members($group);
		if ($contacts) {
			foreach($contacts as $c) {
				if($contact_str)
					$contact_str .= ',';

				$contact_str .= "'" . $c['xchan'] . "'";
			}
		} else {
			$contact_str = ' 0 ';
			$result['message'] = t('Collection is empty.');
			return $result;
		}

		$sql_extra = " AND item.parent IN ( SELECT DISTINCT parent FROM item WHERE true $sql_options AND (( author_xchan IN ( $contact_str ) OR owner_xchan in ( $contact_str)) or allow_gid like '" . protect_sprintf('%<' . dbesc($r[0]['hash']) . '>%') . "' ) and id = parent and item_restrict = 0 ) ";

		$x = group_rec_byhash($uid,$r[0]['hash']);
		$result['headline'] = sprintf( t('Collection: %s'),$x['name']);
	}
	elseif($arr['cid'] && $uid) {

		$r = q("SELECT abook.*, xchan.* from abook left join xchan on abook_xchan = xchan_hash where abook_id = %d and abook_channel = %d and not ( abook_flags & " . intval(ABOOK_FLAG_BLOCKED) . ")>0 limit 1",
			intval($arr['cid']),
			intval(local_channel())
		);
		if ($r) {
			$sql_extra = " AND item.parent IN ( SELECT DISTINCT parent FROM item WHERE true $sql_options AND uid = " . intval($arr['uid']) . " AND ( author_xchan = '" . dbesc($r[0]['abook_xchan']) . "' or owner_xchan = '" . dbesc($r[0]['abook_xchan']) . "' ) and item_restrict = 0 ) ";
			$result['headline'] = sprintf( t('Connection: %s'),$r[0]['xchan_name']);
		} else {
			$result['message'] = t('Connection not found.');
			return $result;
		}
	}

	if ($arr['datequery']) {
		$sql_extra3 .= protect_sprintf(sprintf(" AND item.created <= '%s' ", dbesc(datetime_convert(date_default_timezone_get(),'',$arr['datequery']))));
	}
	if ($arr['datequery2']) {
		$sql_extra3 .= protect_sprintf(sprintf(" AND item.created >= '%s' ", dbesc(datetime_convert(date_default_timezone_get(),'',$arr['datequery2']))));
	}

	if(! array_key_exists('nouveau',$arr)) {
		$sql_extra2 = " AND item.parent = item.id ";
		$sql_extra3 = '';
	}

	if($arr['search']) {
		if(strpos($arr['search'],'#') === 0)
			$sql_extra .= term_query('item',substr($arr['search'],1),TERM_HASHTAG);
		else
			$sql_extra .= sprintf(" AND item.body like '%s' ",
				dbesc(protect_sprintf('%' . $arr['search'] . '%'))
			);
	}

	if (strlen($arr['file'])) {
		$sql_extra .= term_query('item',$arr['files'],TERM_FILE);
	}

	if ($arr['conv'] && $channel) {
		$sql_extra .= sprintf(" AND parent IN (SELECT distinct parent from item where ( author_xchan like '%s' or ( item_flags & %d )>0)) ",
			dbesc(protect_sprintf($uidhash)),
			intval(ITEM_MENTIONSME)
		);
	}

	if (($client_mode & CLIENT_MODE_UPDATE) && (! ($client_mode & CLIENT_MODE_LOAD))) {
		// only setup pagination on initial page view
		$pager_sql = '';
	} else {
		$itemspage = (($channel) ? get_pconfig($uid,'system','itemspage') : 20);
		$a->set_pager_itemspage(((intval($itemspage)) ? $itemspage : 20));
		$pager_sql = sprintf(" LIMIT %d OFFSET %d ", intval(get_app()->pager['itemspage']), intval(get_app()->pager['start']));
	}

	if (isset($arr['start']) && isset($arr['records']))
		$pager_sql = sprintf(" LIMIT %d OFFSET %d ", intval($arr['records']), intval($arr['start']));

	if (array_key_exists('cmin',$arr) || array_key_exists('cmax',$arr)) {
		if (($arr['cmin'] != 0) || ($arr['cmax'] != 99)) {

			// Not everybody who shows up in the network stream will be in your address book.
			// By default those that aren't are assumed to have closeness = 99; but this isn't
			// recorded anywhere. So if cmax is 99, we'll open the search up to anybody in
			// the stream with a NULL address book entry.

			$sql_nets .= " AND ";

			if ($arr['cmax'] == 99)
				$sql_nets .= " ( ";

			$sql_nets .= "( abook.abook_closeness >= " . intval($arr['cmin']) . " ";
			$sql_nets .= " AND abook.abook_closeness <= " . intval($arr['cmax']) . " ) ";
			/** @fixme dead code, $cmax is undefined */
			if ($cmax == 99)
				$sql_nets .= " OR abook.abook_closeness IS NULL ) ";
		}
	}

	$simple_update = (($client_mode & CLIENT_MODE_UPDATE) ? " and ( item.item_unseen = 1 ) " : '');
	if ($client_mode & CLIENT_MODE_LOAD)
		$simple_update = '';

	//$start = dba_timer();

	require_once('include/security.php');
	$sql_extra .= item_permissions_sql($channel['channel_id'],$observer_hash);

	if ($arr['pages'])
		$item_restrict = " AND (item_restrict & " . ITEM_WEBPAGE . ") ";
	else
		$item_restrict = " AND item_restrict = 0 ";

	if ($arr['nouveau'] && ($client_mode & CLIENT_MODE_LOAD) && $channel) {
		// "New Item View" - show all items unthreaded in reverse created date order

		$items = q("SELECT item.*, item.id AS item_id FROM item
				WHERE $item_uids $item_restrict
				$simple_update
				$sql_extra $sql_nets
				ORDER BY item.received DESC $pager_sql"
		);

		require_once('include/items.php');

		xchan_query($items);

		$items = fetch_post_tags($items,true);
	} else {

		// Normal conversation view

		if($arr['order'] === 'post')
			$ordering = "created";
		else
			$ordering = "commented";

		if(($client_mode & CLIENT_MODE_LOAD) || ($client_mode == CLIENT_MODE_NORMAL)) {

            // Fetch a page full of parent items for this page

            $r = q("SELECT distinct item.id AS item_id, item.$ordering FROM item
                left join abook on item.author_xchan = abook.abook_xchan
                WHERE $item_uids $item_restrict
                AND item.parent = item.id
                and ((abook.abook_flags & %d) = 0 or abook.abook_flags is null)
                $sql_extra3 $sql_extra $sql_nets
                ORDER BY item.$ordering DESC $pager_sql ",
                intval(ABOOK_FLAG_BLOCKED)
            );

        }
        else {
            // update
            $r = q("SELECT item.parent AS item_id FROM item
                left join abook on item.author_xchan = abook.abook_xchan
                WHERE $item_uids $item_restrict $simple_update
                and ((abook.abook_flags & %d) = 0 or abook.abook_flags is null)
                $sql_extra3 $sql_extra $sql_nets ",
                intval(ABOOK_FLAG_BLOCKED)
            );
        }

		//$first = dba_timer();

		// Then fetch all the children of the parents that are on this page

		if($r) {

			$parents_str = ids_to_querystr($r,'item_id');

			if($arr['top'])
				$sql_extra = ' and id = parent ' . $sql_extra;

			$items = q("SELECT item.*, item.id AS item_id FROM item
				WHERE $item_uids $item_restrict
				AND item.parent IN ( %s )
				$sql_extra ",
				dbesc($parents_str)
			);

			//$second = dba_timer();

			xchan_query($items);

			//$third = dba_timer();

			$items = fetch_post_tags($items,true);

			//$fourth = dba_timer();

			require_once('include/conversation.php');
			$items = conv_sort($items,$ordering);

			//logger('items: ' . print_r($items,true));
		} else {
			$items = array();
		}

		if($parents_str && $arr['mark_seen'])
			$update_unseen = ' AND parent IN ( ' . dbesc($parents_str) . ' )';
			/** @FIXME finish mark unseen sql */
	}

	return $items;
}


function update_remote_id($channel,$post_id,$webpage,$pagetitle,$namespace,$remote_id,$mid) {

	$page_type = '';

	if(! $post_id)
		return;
	
	if($webpage & ITEM_WEBPAGE)
		$page_type = 'WEBPAGE';
	elseif($webpage & ITEM_BUILDBLOCK)
		$page_type = 'BUILDBLOCK';
	elseif($webpage & ITEM_PDL)
		$page_type = 'PDL';
	elseif($namespace && $remote_id) {
		$page_type = $namespace;
		$pagetitle = $remote_id;
	}

	if($page_type) {

		// store page info as an alternate message_id so we can access it via
		//    https://sitename/page/$channelname/$pagetitle
		// if no pagetitle was given or it couldn't be transliterated into a url, use the first
		// sixteen bytes of the mid - which makes the link portable and not quite as daunting
		// as the entire mid. If it were the post_id the link would be less portable.

		$r = q("select * from item_id where iid = %d and uid = %d and service = '%s' limit 1",
			intval($post_id),
			intval($channel['channel_id']),
			dbesc($page_type)
		);
		if($r) {
			q("update item_id set sid = '%s' where id = %d",
				dbesc(($pagetitle) ? $pagetitle : substr($mid,0,16)),
				intval($r[0]['id'])
			);
		}
		else {
			q("insert into item_id ( iid, uid, sid, service ) values ( %d, %d, '%s','%s' )",
				intval($post_id),
				intval($channel['channel_id']),
				dbesc(($pagetitle) ? $pagetitle : substr($mid,0,16)),
				dbesc($page_type)
			);
		}
	}
}


/**
 * @brief Change access control for item with message_id $mid and channel_id $uid.
 *
 * @param string $xchan_hash
 * @param string $mid
 * @param int $uid
 */
function item_add_cid($xchan_hash, $mid, $uid) {
	$r = q("select id from item where mid = '%s' and uid = %d and allow_cid like '%s'",
		dbesc($mid),
		intval($uid),
		dbesc('<' . $xchan_hash . '>')
	);
	if(! $r) {
		$r = q("update item set allow_cid = concat(allow_cid,'%s') where mid = '%s' and uid = %d",
			dbesc('<' . $xchan_hash . '>'),
			dbesc($mid),
			intval($uid)
		);
	}
}

function item_remove_cid($xchan_hash,$mid,$uid) {
	$r = q("select allow_cid from item where mid = '%s' and uid = %d and allow_cid like '%s'",
		dbesc($mid),
		intval($uid),
		dbesc('<' . $xchan_hash . '>')
	);
	if($r) {
		$x = q("update item set allow_cid = '%s' where mid = '%s' and uid = %d",
			dbesc(str_replace('<' . $xchan_hash . '>','',$r[0]['allow_cid'])),
			dbesc($mid),
			intval($uid)
		);
	}
}

// Set item permissions based on results obtained from linkify_tags()
function set_linkified_perms($linkified, &$str_contact_allow, &$str_group_allow, $profile_uid, $parent_item = false, &$private) {
	$first_access_tag = true;

	foreach($linkified as $x) {
		$access_tag = $x['access_tag'];
		if(($access_tag) && (! $parent_item)) {
			logger('access_tag: ' . $tag . ' ' . print_r($access_tag,true), LOGGER_DATA);
			if ($first_access_tag && (! get_pconfig($profile_uid,'system','no_private_mention_acl_override'))) {

				// This is a tough call, hence configurable. The issue is that one can type in a @!privacy mention
				// and also have a default ACL (perhaps from viewing a collection) and could be suprised that the
				// privacy mention wasn't the only recipient. So the default is to wipe out the existing ACL if a
				// private mention is found. This can be over-ridden if you wish private mentions to be in
				// addition to the current ACL settings.

				$str_contact_allow = '';
				$str_group_allow = '';
				$first_access_tag = false;
			}
			if(strpos($access_tag,'cid:') === 0) {
				$str_contact_allow .= '<' . substr($access_tag,4) . '>';
				$access_tag = '';
				$private = 1;
			}
			elseif(strpos($access_tag,'gid:') === 0) {
				$str_group_allow .= '<' . substr($access_tag,4) . '>';
				$access_tag = '';
				$private = 1;
			}
		}
	}
}

/**
 * We can't trust ITEM_ORIGIN to tell us if this is a local comment
 * which needs to be relayed, because it was misconfigured at one point for several
 * months and set for some remote items (in alternate delivery chains). This could
 * cause looping, so use this hackish but accurate method.
 *
 * @param array $item
 * @return boolean
 */
function comment_local_origin($item) {
	if(stripos($item['mid'], get_app()->get_hostname()) && ($item['parent'] != $item['id']))
		return true;

	return false;
}


function gen_asld($items) {
	$ret = array();
	if(! $items)
		return $ret;
	foreach($items as $item) {
		$ret[] = i2asld($item);
	}
	return $ret;
}


function i2asld($i) {

	if(! $i)
		return array();

	$ret = array();

	$ret['@context'] = array( 'http://www.w3.org/ns/activitystreams', 'zot' => 'http://purl.org/zot/protocol');

	if($i['verb']) {
		if(strpos(dirname($i['verb'],'activitystrea.ms/schema/1.0'))) {
			$ret['@type'] = ucfirst(basename($i['verb']));
		}
		elseif(strpos(dirname($i['verb'],'purl.org/zot'))) {
			$ret['@type'] = 'zot:' . ucfirst(basename($i['verb']));
		}
	}
	$ret['@id'] = $i['plink'];

	$ret['published'] = datetime_convert('UTC','UTC',$i['created'],ATOM_TIME);

	// we need to pass the parent into this
//	if($i['id'] != $i['parent'] && $i['obj_type'] === ACTIVITY_OBJ_NOTE) {
//		$ret['inReplyTo'] = asencode_note
//	}

	if($i['obj_type'] === ACTIVITY_OBJ_NOTE)
		$ret['object'] = asencode_note($i);


	$ret['actor'] = asencode_person($i['author']);

	
	return $ret;
	
}

function asencode_note($i) {

	$ret = array();

	$ret['@type'] = 'Note';
	$ret['@id'] = $i['plink'];
	if($i['title'])
		$ret['title'] = bbcode($i['title']);
	$ret['content'] = bbcode($i['body']);
	$ret['zot:owner'] = asencode_person($i['owner']);
	$ret['published'] = datetime_convert('UTC','UTC',$i['created'],ATOM_TIME);
	if($i['created'] !== $i['edited'])
		$ret['updated'] = datetime_convert('UTC','UTC',$i['edited'],ATOM_TIME);

	return $ret;
}


function asencode_person($p) {
	$ret = array();
	$ret['@type'] = 'Person';
	$ret['@id'] = 'acct:' . $p['xchan_addr'];
	$ret['displayName'] = $p['xchan_name'];
	$ret['icon'] = array(
		'@type' => 'Link',
		'mediaType' => $p['xchan_photo_mimetype'],
		'href' => $p['xchan_photo_m']
	);
	$ret['url'] = array(
		'@type' => 'Link',
		'mediaType' => 'text/html',
		'href' => $p['xchan_url']
	);

	return $ret;
}