friendica/include/items.php

<?php

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

use \Friendica\ParseUrl;

require_once('include/bbcode.php');
require_once('include/oembed.php');
require_once('include/salmon.php');
require_once('include/crypto.php');
require_once('include/Photo.php');
require_once('include/tags.php');
require_once('include/files.php');
require_once('include/text.php');
require_once('include/email.php');
require_once('include/threads.php');
require_once('include/socgraph.php');
require_once('include/plaintext.php');
require_once('include/ostatus.php');
require_once('include/feed.php');
require_once('include/Contact.php');
require_once('mod/share.php');
require_once('include/enotify.php');
require_once('include/dfrn.php');
require_once('include/group.php');

require_once('library/defuse/php-encryption-1.2.1/Crypto.php');

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

/* limit_body_size()
 *
 *		The purpose of this function is to apply system message length limits to
 *		imported messages without including any embedded photos in the length
 */
if (! function_exists('limit_body_size')) {
function limit_body_size($body) {

//	logger('limit_body_size: start', LOGGER_DEBUG);

	$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)) {

		logger('limit_body_size: the total body length exceeds the limit', LOGGER_DEBUG);

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

		$img_start = strpos($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) {
						logger('limit_body_size: the limit happens before the end of a non-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_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) {
				logger('limit_body_size: the limit happens after the end of the last image', LOGGER_DEBUG);
				$new_body = $new_body . substr($orig_body, 0, $maxlen - $textlen);
				$textlen = $maxlen;
			}
		} else {
			logger('limit_body_size: the text size with embedded images extracted did not violate the limit', LOGGER_DEBUG);
			$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);
	$title = html_entity_decode($title, ENT_QUOTES, 'UTF-8');
	$title = str_replace(array("\n", "\r", "\t", " "), array("","","",""), $title);

	$body = strip_tags($body);
	$body = trim($body);
	$body = html_entity_decode($body, ENT_QUOTES, 'UTF-8');
	$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 add_page_info_data($data) {
	call_hooks('page_info_data', $data);

	// It maybe is a rich content, but if it does have everything that a link has,
	// then treat it that way
	if (($data["type"] == "rich") AND is_string($data["title"]) AND
		is_string($data["text"]) AND (sizeof($data["images"]) > 0)) {
		$data["type"] = "link";
	}

	if ((($data["type"] != "link") AND ($data["type"] != "video") AND ($data["type"] != "photo")) OR ($data["title"] == $data["url"])) {
		return "";
	}

	if ($no_photos AND ($data["type"] == "photo")) {
		return "";
	}

	if (sizeof($data["images"]) > 0) {
		$preview = $data["images"][0];
	} else {
		$preview = "";
	}

	// Escape some bad characters
	$data["url"] = str_replace(array("[", "]"), array("&#91;", "&#93;"), htmlentities($data["url"], ENT_QUOTES, 'UTF-8', false));
	$data["title"] = str_replace(array("[", "]"), array("&#91;", "&#93;"), htmlentities($data["title"], ENT_QUOTES, 'UTF-8', false));

	$text = "[attachment type='".$data["type"]."'";

	if ($data["text"] == "") {
		$data["text"] = $data["title"];
	}

	if ($data["text"] == "") {
		$data["text"] = $data["url"];
	}

	if ($data["url"] != "") {
		$text .= " url='".$data["url"]."'";
	}

	if ($data["title"] != "") {
		$text .= " title='".$data["title"]."'";
	}

	if (sizeof($data["images"]) > 0) {
		$preview = str_replace(array("[", "]"), array("&#91;", "&#93;"), htmlentities($data["images"][0]["src"], ENT_QUOTES, 'UTF-8', false));
		// if the preview picture is larger than 500 pixels then show it in a larger mode
		// But only, if the picture isn't higher than large (To prevent huge posts)
		if (($data["images"][0]["width"] >= 500) AND ($data["images"][0]["width"] >= $data["images"][0]["height"])) {
			$text .= " image='".$preview."'";
		} else {
			$text .= " preview='".$preview."'";
		}
	}

	$text .= "]".$data["text"]."[/attachment]";

	$hashtags = "";
	if (isset($data["keywords"]) AND count($data["keywords"])) {
		$hashtags = "\n";
		foreach ($data["keywords"] AS $keyword) {
			/// @todo make a positive list of allowed characters
			$hashtag = str_replace(array(" ", "+", "/", ".", "#", "'", "’", "`", "(", ")", "„", "“"),
						array("","", "", "", "", "", "", "", "", "", "", ""), $keyword);
			$hashtags .= "#[url=".App::get_baseurl()."/search?tag=".rawurlencode($hashtag)."]".$hashtag."[/url] ";
		}
	}

	return "\n".$text.$hashtags;
}

function query_page_info($url, $no_photos = false, $photo = "", $keywords = false, $keyword_blacklist = "") {

	$data = ParseUrl::getSiteinfoCached($url, true);

	if ($photo != "")
		$data["images"][0]["src"] = $photo;

	logger('fetch page info for '.$url.' '.print_r($data, true), LOGGER_DEBUG);

	if (!$keywords AND isset($data["keywords"]))
		unset($data["keywords"]);

	if (($keyword_blacklist != "") AND isset($data["keywords"])) {
		$list = explode(",", $keyword_blacklist);
		foreach ($list AS $keyword) {
			$keyword = trim($keyword);
			$index = array_search($keyword, $data["keywords"]);
			if ($index !== false)
				unset($data["keywords"][$index]);
		}
	}

	return($data);
}

function add_page_keywords($url, $no_photos = false, $photo = "", $keywords = false, $keyword_blacklist = "") {
	$data = query_page_info($url, $no_photos, $photo, $keywords, $keyword_blacklist);

	$tags = "";
	if (isset($data["keywords"]) AND count($data["keywords"])) {
		foreach ($data["keywords"] AS $keyword) {
			$hashtag = str_replace(array(" ", "+", "/", ".", "#", "'"),
						array("","", "", "", "", ""), $keyword);

			if ($tags != "")
				$tags .= ",";

			$tags .= "#[url=".App::get_baseurl()."/search?tag=".rawurlencode($hashtag)."]".$hashtag."[/url]";
		}
	}

	return($tags);
}

function add_page_info($url, $no_photos = false, $photo = "", $keywords = false, $keyword_blacklist = "") {
	$data = query_page_info($url, $no_photos, $photo, $keywords, $keyword_blacklist);

	$text = add_page_info_data($data);

	return($text);
}

function add_page_info_to_body($body, $texturl = false, $no_photos = false) {

	logger('add_page_info_to_body: fetch page info for body '.$body, LOGGER_DEBUG);

	$URLSearchString = "^\[\]";

	// Fix for Mastodon where the mentions are in a different format
	$body = preg_replace("/\[url\=([$URLSearchString]*)\]([#!@])(.*?)\[\/url\]/ism",
				'$2[url=$1]$3[/url]', $body);

	// Adding these spaces is a quick hack due to my problems with regular expressions :)
	preg_match("/[^!#@]\[url\]([$URLSearchString]*)\[\/url\]/ism", " ".$body, $matches);

	if (!$matches)
		preg_match("/[^!#@]\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism", " ".$body, $matches);

	// Convert urls without bbcode elements
	if (!$matches AND $texturl) {
		preg_match("/([^\]\='".'"'."]|^)(https?\:\/\/[a-zA-Z0-9\:\/\-\?\&\;\.\=\_\~\#\%\$\!\+\,]+)/ism", " ".$body, $matches);

		// Yeah, a hack. I really hate regular expressions :)
		if ($matches)
			$matches[1] = $matches[2];
	}

	if ($matches)
		$footer = add_page_info($matches[1], $no_photos);

	// Remove the link from the body if the link is attached at the end of the post
	if (isset($footer) AND (trim($footer) != "") AND (strpos($footer, $matches[1]))) {
		$removedlink = trim(str_replace($matches[1], "", $body));
		if (($removedlink == "") OR strstr($body, $removedlink))
			$body = $removedlink;

		$url = str_replace(array('/', '.'), array('\/', '\.'), $matches[1]);
		$removedlink = preg_replace("/\[url\=".$url."\](.*?)\[\/url\]/ism", '', $body);
		if (($removedlink == "") OR strstr($body, $removedlink))
			$body = $removedlink;
	}

	// Add the page information to the bottom
	if (isset($footer) AND (trim($footer) != ""))
		$body .= $footer;

	return $body;
}

/**
 * Adds a "lang" specification in a "postopts" element of given $arr,
 * if possible and not already present.
 * Expects "body" element to exist in $arr.
 * 
 * @todo Add a parameter to request forcing override
 */
function item_add_language_opt(&$arr) {

	if (version_compare(PHP_VERSION, '5.3.0', '<')) return; // LanguageDetect.php not available ?

	if ( x($arr, 'postopts') )
	{
		if ( strstr($arr['postopts'], 'lang=') )
		{
			// do not override
			/// @TODO Add parameter to request overriding
			return;
		}
		$postopts = $arr['postopts'];
	} else {
		$postopts = "";
	}

	require_once('library/langdet/Text/LanguageDetect.php');
	$naked_body = preg_replace('/\[(.+?)\]/','',$arr['body']);
	$l = new Text_LanguageDetect;
	//$lng = $l->detectConfidence($naked_body);
	//$arr['postopts'] = (($lng['language']) ? 'lang=' . $lng['language'] . ';' . $lng['confidence'] : '');
	$lng = $l->detect($naked_body, 3);

	if (sizeof($lng) > 0) {
		if ($postopts != "") $postopts .= '&'; // arbitrary separator, to be reviewed
		$postopts .= 'lang=';
		$sep = "";
		foreach ($lng as $language => $score) {
			$postopts .= $sep . $language.";".$score;
			$sep = ':';
		}
		$arr['postopts'] = $postopts;
	}
}

/**
 * @brief Creates an unique guid out of a given uri
 *
 * @param string $uri uri of an item entry
 * @param string $host (Optional) hostname for the GUID prefix
 * @return string unique guid
 */
function uri_to_guid($uri, $host = "") {

	// Our regular guid routine is using this kind of prefix as well
	// We have to avoid that different routines could accidentally create the same value
	$parsed = parse_url($uri);

	if ($host == "") {
		$host = $parsed["host"];
	}

	$guid_prefix = hash("crc32", $host);

	// Remove the scheme to make sure that "https" and "http" doesn't make a difference
	unset($parsed["scheme"]);

	$host_id = implode("/", $parsed);

	// We could use any hash algorithm since it isn't a security issue
	$host_hash = hash("ripemd128", $host_id);

	return $guid_prefix.$host_hash;
}

function item_store($arr,$force_parent = false, $notify = false, $dontcache = false) {

	$a = get_app();

	// If it is a posting where users should get notifications, then define it as wall posting
	if ($notify) {
		$arr['wall'] = 1;
		$arr['type'] = 'wall';
		$arr['origin'] = 1;
		$arr['last-child'] = 1;
		$arr['network'] = NETWORK_DFRN;

		// We have to avoid duplicates. So we create the GUID in form of a hash of the plink or uri.
		// In difference to the call to "uri_to_guid" several lines below we add the hash of our own host.
		// This is done because our host is the original creator of the post.
		if (isset($arr['plink'])) {
			$arr['guid'] = uri_to_guid($arr['plink'], $a->get_hostname());
		} elseif (isset($arr['uri'])) {
			$arr['guid'] = uri_to_guid($arr['uri'], $a->get_hostname());
		}
	}

	// If a Diaspora signature structure was passed in, pull it out of the
	// item array and set it aside for later storage.

	$dsprsig = null;
	if (x($arr,'dsprsig')) {
		$encoded_signature = $arr['dsprsig'];
		$dsprsig = json_decode(base64_decode($arr['dsprsig']));
		unset($arr['dsprsig']);
	}

	// Converting the plink
	if ($arr['network'] == NETWORK_OSTATUS) {
		if (isset($arr['plink']))
			$arr['plink'] = ostatus::convert_href($arr['plink']);
		elseif (isset($arr['uri']))
			$arr['plink'] = ostatus::convert_href($arr['uri']);
	}

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

	if (! x($arr,'type'))
		$arr['type']      = 'remote';



	/* check for create  date and expire time */
	$uid = intval($arr['uid']);
	$r = q("SELECT expire FROM user WHERE uid = %d", intval($uid));
	if (dbm::is_result($r)) {
		$expire_interval = $r[0]['expire'];
		if ($expire_interval>0) {
			$expire_date =  new DateTime( '- '.$expire_interval.' days', new DateTimeZone('UTC'));
			$created_date = new DateTime($arr['created'], new DateTimeZone('UTC'));
			if ($created_date < $expire_date) {
				logger('item-store: item created ('.$arr['created'].') before expiration time ('.$expire_date->format(DateTime::W3C).'). ignored. ' . print_r($arr,true), LOGGER_DEBUG);
				return 0;
			}
		}
	}

	// Do we already have this item?
	// We have to check several networks since Friendica posts could be repeated via OStatus (maybe Diasporsa as well)
	if (in_array(trim($arr['network']), array(NETWORK_DIASPORA, NETWORK_DFRN, NETWORK_OSTATUS, ""))) {
		$r = q("SELECT `id`, `network` FROM `item` WHERE `uri` = '%s' AND `uid` = %d AND `network` IN ('%s', '%s', '%s')  LIMIT 1",
				dbesc(trim($arr['uri'])),
				intval($uid),
				dbesc(NETWORK_DIASPORA),
				dbesc(NETWORK_DFRN),
				dbesc(NETWORK_OSTATUS)
			);
		if ($r) {
			// We only log the entries with a different user id than 0. Otherwise we would have too many false positives
			if ($uid != 0)
				logger("Item with uri ".$arr['uri']." already existed for user ".$uid." with id ".$r[0]["id"]." target network ".$r[0]["network"]." - new network: ".$arr['network']);
			return($r[0]["id"]);
		}
	}

	// Shouldn't happen but we want to make absolutely sure it doesn't leak from a plugin.
	// Deactivated, since the bbcode parser can handle with it - and it destroys posts with some smileys that contain "<"
	//if ((strpos($arr['body'],'<') !== false) || (strpos($arr['body'],'>') !== false))
	//	$arr['body'] = strip_tags($arr['body']);

	item_add_language_opt($arr);

	if ($notify)
		$guid_prefix = "";
	elseif ((trim($arr['guid']) == "") AND (trim($arr['plink']) != ""))
		$arr['guid'] = uri_to_guid($arr['plink']);
	elseif ((trim($arr['guid']) == "") AND (trim($arr['uri']) != ""))
		$arr['guid'] = uri_to_guid($arr['uri']);
	else {
		$parsed = parse_url($arr["author-link"]);
		$guid_prefix = hash("crc32", $parsed["host"]);
	}

	$arr['wall']          = ((x($arr,'wall'))          ? intval($arr['wall'])                : 0);
	$arr['guid']          = ((x($arr,'guid'))          ? notags(trim($arr['guid']))          : get_guid(32, $guid_prefix));
	$arr['uri']           = ((x($arr,'uri'))           ? notags(trim($arr['uri']))           : item_new_uri($a->get_hostname(), $uid, $arr['guid']));
	$arr['extid']         = ((x($arr,'extid'))         ? notags(trim($arr['extid']))         : '');
	$arr['author-name']   = ((x($arr,'author-name'))   ? trim($arr['author-name'])   : '');
	$arr['author-link']   = ((x($arr,'author-link'))   ? notags(trim($arr['author-link']))   : '');
	$arr['author-avatar'] = ((x($arr,'author-avatar')) ? notags(trim($arr['author-avatar'])) : '');
	$arr['owner-name']    = ((x($arr,'owner-name'))    ? trim($arr['owner-name'])    : '');
	$arr['owner-link']    = ((x($arr,'owner-link'))    ? notags(trim($arr['owner-link']))    : '');
	$arr['owner-avatar']  = ((x($arr,'owner-avatar'))  ? notags(trim($arr['owner-avatar']))  : '');
	$arr['created']       = ((x($arr,'created') !== false) ? datetime_convert('UTC','UTC',$arr['created']) : datetime_convert());
	$arr['edited']        = ((x($arr,'edited')  !== false) ? datetime_convert('UTC','UTC',$arr['edited'])  : datetime_convert());
	$arr['commented']     = ((x($arr,'commented')  !== false) ? datetime_convert('UTC','UTC',$arr['commented'])  : datetime_convert());
	$arr['received']      = ((x($arr,'received')  !== false) ? datetime_convert('UTC','UTC',$arr['received'])  : datetime_convert());
	$arr['changed']       = ((x($arr,'changed')  !== false) ? datetime_convert('UTC','UTC',$arr['changed'])  : datetime_convert());
	$arr['title']         = ((x($arr,'title'))         ? trim($arr['title'])         : '');
	$arr['location']      = ((x($arr,'location'))      ? trim($arr['location'])      : '');
	$arr['coord']         = ((x($arr,'coord'))         ? notags(trim($arr['coord']))         : '');
	$arr['last-child']    = ((x($arr,'last-child'))    ? intval($arr['last-child'])          : 0 );
	$arr['visible']       = ((x($arr,'visible') !== false) ? intval($arr['visible'])         : 1 );
	$arr['deleted']       = 0;
	$arr['parent-uri']    = ((x($arr,'parent-uri'))    ? notags(trim($arr['parent-uri']))    : $arr['uri']);
	$arr['verb']          = ((x($arr,'verb'))          ? notags(trim($arr['verb']))          : '');
	$arr['object-type']   = ((x($arr,'object-type'))   ? notags(trim($arr['object-type']))   : '');
	$arr['object']        = ((x($arr,'object'))        ? trim($arr['object'])                : '');
	$arr['target-type']   = ((x($arr,'target-type'))   ? notags(trim($arr['target-type']))   : '');
	$arr['target']        = ((x($arr,'target'))        ? trim($arr['target'])                : '');
	$arr['plink']         = ((x($arr,'plink'))         ? notags(trim($arr['plink']))         : '');
	$arr['allow_cid']     = ((x($arr,'allow_cid'))     ? trim($arr['allow_cid'])             : '');
	$arr['allow_gid']     = ((x($arr,'allow_gid'))     ? trim($arr['allow_gid'])             : '');
	$arr['deny_cid']      = ((x($arr,'deny_cid'))      ? trim($arr['deny_cid'])              : '');
	$arr['deny_gid']      = ((x($arr,'deny_gid'))      ? trim($arr['deny_gid'])              : '');
	$arr['private']       = ((x($arr,'private'))       ? intval($arr['private'])             : 0 );
	$arr['bookmark']      = ((x($arr,'bookmark'))      ? intval($arr['bookmark'])            : 0 );
	$arr['body']          = ((x($arr,'body'))          ? trim($arr['body'])                  : '');
	$arr['tag']           = ((x($arr,'tag'))           ? notags(trim($arr['tag']))           : '');
	$arr['attach']        = ((x($arr,'attach'))        ? notags(trim($arr['attach']))        : '');
	$arr['app']           = ((x($arr,'app'))           ? notags(trim($arr['app']))           : '');
	$arr['origin']        = ((x($arr,'origin'))        ? intval($arr['origin'])              : 0 );
	$arr['network']       = ((x($arr,'network'))       ? trim($arr['network'])               : '');
	$arr['postopts']      = ((x($arr,'postopts'))      ? trim($arr['postopts'])              : '');
	$arr['resource-id']   = ((x($arr,'resource-id'))   ? trim($arr['resource-id'])           : '');
	$arr['event-id']      = ((x($arr,'event-id'))      ? intval($arr['event-id'])            : 0 );
	$arr['inform']        = ((x($arr,'inform'))        ? trim($arr['inform'])                : '');
	$arr['file']          = ((x($arr,'file'))          ? trim($arr['file'])                  : '');

	// Items cannot be stored before they happen ...
	if ($arr['created'] > datetime_convert())
		$arr['created'] = datetime_convert();

	// We haven't invented time travel by now.
	if ($arr['edited'] > datetime_convert())
		$arr['edited'] = datetime_convert();

	if (($arr['author-link'] == "") AND ($arr['owner-link'] == ""))
		logger("Both author-link and owner-link are empty. Called by: ".App::callstack(), LOGGER_DEBUG);

	if ($arr['plink'] == "") {
		$arr['plink'] = App::get_baseurl().'/display/'.urlencode($arr['guid']);
	}

	if ($arr['network'] == "") {
		$r = q("SELECT `network` FROM `contact` WHERE `network` IN ('%s', '%s', '%s') AND `nurl` = '%s' AND `uid` = %d LIMIT 1",
			dbesc(NETWORK_DFRN), dbesc(NETWORK_DIASPORA), dbesc(NETWORK_OSTATUS),
			dbesc(normalise_link($arr['author-link'])),
			intval($arr['uid'])
		);

		if (!dbm::is_result($r))
			$r = q("SELECT `network` FROM `gcontact` WHERE `network` IN ('%s', '%s', '%s') AND `nurl` = '%s' LIMIT 1",
				dbesc(NETWORK_DFRN), dbesc(NETWORK_DIASPORA), dbesc(NETWORK_OSTATUS),
				dbesc(normalise_link($arr['author-link']))
			);

		if (!dbm::is_result($r))
			$r = q("SELECT `network` FROM `contact` WHERE `id` = %d AND `uid` = %d LIMIT 1",
				intval($arr['contact-id']),
				intval($arr['uid'])
			);

		if (dbm::is_result($r))
			$arr['network'] = $r[0]["network"];

		// Fallback to friendica (why is it empty in some cases?)
		if ($arr['network'] == "")
			$arr['network'] = NETWORK_DFRN;

		logger("item_store: Set network to ".$arr["network"]." for ".$arr["uri"], LOGGER_DEBUG);
	}

	// The contact-id should be set before "item_store" was called - but there seems to be some issues
	if ($arr["contact-id"] == 0) {
		// First we are looking for a suitable contact that matches with the author of the post
		// This is done only for comments (See below explanation at "gcontact-id")
		if ($arr['parent-uri'] != $arr['uri'])
			$arr["contact-id"] = get_contact($arr['author-link'], $uid);

		// If not present then maybe the owner was found
		if ($arr["contact-id"] == 0)
			$arr["contact-id"] = get_contact($arr['owner-link'], $uid);

		// Still missing? Then use the "self" contact of the current user
		if ($arr["contact-id"] == 0) {
			$r = q("SELECT `id` FROM `contact` WHERE `self` AND `uid` = %d", intval($uid));
			if ($r)
				$arr["contact-id"] = $r[0]["id"];
		}
		logger("Contact-id was missing for post ".$arr["guid"]." from user id ".$uid." - now set to ".$arr["contact-id"], LOGGER_DEBUG);
	}

	if ($arr["gcontact-id"] == 0) {
		// The gcontact should mostly behave like the contact. But is is supposed to be global for the system.
		// This means that wall posts, repeated posts, etc. should have the gcontact id of the owner.
		// On comments the author is the better choice.
		if ($arr['parent-uri'] === $arr['uri'])
			$arr["gcontact-id"] = get_gcontact_id(array("url" => $arr['owner-link'], "network" => $arr['network'],
								 "photo" => $arr['owner-avatar'], "name" => $arr['owner-name']));
		else
			$arr["gcontact-id"] = get_gcontact_id(array("url" => $arr['author-link'], "network" => $arr['network'],
								 "photo" => $arr['author-avatar'], "name" => $arr['author-name']));
	}

	if ($arr["author-id"] == 0)
		$arr["author-id"] = get_contact($arr["author-link"], 0);

	if ($arr["owner-id"] == 0)
		$arr["owner-id"] = get_contact($arr["owner-link"], 0);

	if ($arr['guid'] != "") {
		// Checking if there is already an item with the same guid
		logger('checking for an item for user '.$arr['uid'].' on network '.$arr['network'].' with the guid '.$arr['guid'], LOGGER_DEBUG);
		$r = q("SELECT `guid` FROM `item` WHERE `guid` = '%s' AND `network` = '%s' AND `uid` = '%d' LIMIT 1",
			dbesc($arr['guid']), dbesc($arr['network']), intval($arr['uid']));

		if (dbm::is_result($r)) {
			logger('found item with guid '.$arr['guid'].' for user '.$arr['uid'].' on network '.$arr['network'], LOGGER_DEBUG);
			return 0;
		}
	}

	// Check for hashtags in the body and repair or add hashtag links
	item_body_set_hashtags($arr);

	$arr['thr-parent'] = $arr['parent-uri'];
	if ($arr['parent-uri'] === $arr['uri']) {
		$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'];
		$notify_type = 'wall-new';
	} else {

		// find the parent and snarf the item id and ACLs
		// and anything else we need to inherit

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

		if (dbm::is_result($r)) {

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

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

			$parent_id      = $r[0]['id'];
			$parent_deleted = $r[0]['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'];
			$arr['wall']    = $r[0]['wall'];
			$notify_type    = 'comment-new';

			// if the parent is private, force privacy for the entire conversation
			// This differs from the above settings as it subtly allows comments from
			// email correspondents to be private even if the overall thread is not.

			if ($r[0]['private'])
				$arr['private'] = $r[0]['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]['forum_mode']) == 1) && (! $r[0]['private']))
				$arr['private'] = 0;


			// If its a post from myself then tag the thread as "mention"
			logger("item_store: Checking if parent ".$parent_id." has to be tagged as mention for user ".$arr['uid'], LOGGER_DEBUG);
			$u = q("SELECT `nickname` FROM `user` WHERE `uid` = %d", intval($arr['uid']));
			if (dbm::is_result($u)) {
				$a = get_app();
				$self = normalise_link(App::get_baseurl() . '/profile/' . $u[0]['nickname']);
				logger("item_store: 'myself' is ".$self." for parent ".$parent_id." checking against ".$arr['author-link']." and ".$arr['owner-link'], LOGGER_DEBUG);
				if ((normalise_link($arr['author-link']) == $self) OR (normalise_link($arr['owner-link']) == $self)) {
					q("UPDATE `thread` SET `mention` = 1 WHERE `iid` = %d", intval($parent_id));
					logger("item_store: tagged thread ".$parent_id." as mention for user ".$self, LOGGER_DEBUG);
				}
			}
		} else {

			// Allow one to see reply tweets from status.net even when
			// we don't have or can't see the original post.

			if ($force_parent) {
				logger('item_store: $force_parent=true, reply converted to top-level post.');
				$parent_id = 0;
				$arr['parent-uri'] = $arr['uri'];
				$arr['gravity'] = 0;
			} else {
				logger('item_store: item parent '.$arr['parent-uri'].' for '.$arr['uid'].' was not found - ignoring item');
				return 0;
			}

			$parent_deleted = 0;
		}
	}

	$r = q("SELECT `id` FROM `item` WHERE `uri` = '%s' AND `network` IN ('%s', '%s') AND `uid` = %d LIMIT 1",
		dbesc($arr['uri']),
		dbesc($arr['network']),
		dbesc(NETWORK_DFRN),
		intval($arr['uid'])
	);
	if (dbm::is_result($r)) {
		logger('duplicated item with the same uri found. '.print_r($arr,true));
		return 0;
	}

	// On Friendica and Diaspora the GUID is unique
	if (in_array($arr['network'], array(NETWORK_DFRN, NETWORK_DIASPORA))) {
		$r = q("SELECT `id` FROM `item` WHERE `guid` = '%s' AND `uid` = %d LIMIT 1",
			dbesc($arr['guid']),
			intval($arr['uid'])
		);
		if (dbm::is_result($r)) {
			logger('duplicated item with the same guid found. '.print_r($arr,true));
			return 0;
		}
	} else {
		// Check for an existing post with the same content. There seems to be a problem with OStatus.
		$r = q("SELECT `id` FROM `item` WHERE `body` = '%s' AND `network` = '%s' AND `created` = '%s' AND `contact-id` = %d AND `uid` = %d LIMIT 1",
			dbesc($arr['body']),
			dbesc($arr['network']),
			dbesc($arr['created']),
			intval($arr['contact-id']),
			intval($arr['uid'])
		);
		if (dbm::is_result($r)) {
			logger('duplicated item with the same body found. '.print_r($arr,true));
			return 0;
		}
	}

	// Is this item available in the global items (with uid=0)?
	if ($arr["uid"] == 0) {
		$arr["global"] = true;

		// Set the global flag on all items if this was a global item entry
		q("UPDATE `item` SET `global` = 1 WHERE `uri` = '%s'", dbesc($arr["uri"]));
	} else {
		$isglobal = q("SELECT `global` FROM `item` WHERE `uid` = 0 AND `uri` = '%s'", dbesc($arr["uri"]));

		$arr["global"] = (count($isglobal) > 0);
	}

	// ACL settings
	if (strlen($allow_cid) || strlen($allow_gid) || strlen($deny_cid) || strlen($deny_gid))
		$private = 1;
	else
		$private = $arr['private'];

	$arr["allow_cid"] = $allow_cid;
	$arr["allow_gid"] = $allow_gid;
	$arr["deny_cid"] = $deny_cid;
	$arr["deny_gid"] = $deny_gid;
	$arr["private"] = $private;
	$arr["deleted"] = $parent_deleted;

	// Fill the cache field
	put_item_in_cache($arr);

	if ($notify)
		call_hooks('post_local',$arr);
	else
		call_hooks('post_remote',$arr);

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

	// Check for already added items.
	// There is a timing issue here that sometimes creates double postings.
	// An unique index would help - but the limitations of MySQL (maximum size of index values) prevent this.
	if ($arr["uid"] == 0) {
		$r = qu("SELECT `id` FROM `item` WHERE `uri` = '%s' AND `uid` = 0 LIMIT 1", dbesc(trim($arr['uri'])));
		if (dbm::is_result($r)) {
			logger('Global item already stored. URI: '.$arr['uri'].' on network '.$arr['network'], LOGGER_DEBUG);
			return 0;
		}
	}

	// Store the unescaped version
	$unescaped = $arr;

	dbm::esc_array($arr, true);

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

	q("COMMIT");
	q("START TRANSACTION;");

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

	// And restore it
	$arr = $unescaped;

	// When the item was successfully stored we fetch the ID of the item.
	if (dbm::is_result($r)) {
		$r = q("SELECT LAST_INSERT_ID() AS `item-id`");
		if (dbm::is_result($r)) {
			$current_post = $r[0]['item-id'];
		} else {
			// This shouldn't happen
			$current_post = 0;
		}
	} else {
		// This can happen - for example - if there are locking timeouts.
		q("ROLLBACK");

		// Store the data into a spool file so that we can try again later.

		// At first we restore the Diaspora signature that we removed above.
		if (isset($encoded_signature)) {
			$arr['dsprsig'] = $encoded_signature;
		}

		// Now we store the data in the spool directory
		// We use "microtime" to keep the arrival order and "mt_rand" to avoid duplicates
		$file = 'item-'.round(microtime(true) * 10000).'-'.mt_rand().'.msg';

		$spoolpath = get_spoolpath();
		if ($spoolpath != "") {
			$spool = $spoolpath.'/'.$file;
			file_put_contents($spool, json_encode($arr));
			logger("Item wasn't stored - Item was spooled into file ".$file, LOGGER_DEBUG);
		}
		return 0;
	}

	if ($current_post == 0) {
		// This is one of these error messages that never should occur.
		logger("couldn't find created item - we better quit now.");
		q("ROLLBACK");
		return 0;
	}

	// How much entries have we created?
	// We wouldn't need this query when we could use an unique index - but MySQL has length problems with them.
	$r = q("SELECT COUNT(*) AS `entries` FROM `item` WHERE `uri` = '%s' AND `uid` = %d AND `network` = '%s'",
		dbesc($arr['uri']),
		intval($arr['uid']),
		dbesc($arr['network'])
	);

	if (!dbm::is_result($r)) {
		// This shouldn't happen, since COUNT always works when the database connection is there.
		logger("We couldn't count the stored entries. Very strange ...");
		q("ROLLBACK");
		return 0;
	}

	if ($r[0]["entries"] > 1) {
		// There are duplicates. We delete our just created entry.
		logger('Duplicated post occurred. uri = '.$arr['uri'].' uid = '.$arr['uid']);

		// Yes, we could do a rollback here - but we are having many users with MyISAM.
		q("DELETE FROM `item` WHERE `id` = %d", intval($current_post));
		q("COMMIT");
		return 0;
	} elseif ($r[0]["entries"] == 0) {
		// This really should never happen since we quit earlier if there were problems.
		logger("Something is terribly wrong. We haven't found our created entry.");
		q("ROLLBACK");
		return 0;
	}

	logger('item_store: created item '.$current_post);
	item_set_last_item($arr);

	if (!$parent_id || ($arr['parent-uri'] === $arr['uri']))
		$parent_id = $current_post;

	// Set parent id
	$r = q("UPDATE `item` SET `parent` = %d WHERE `id` = %d",
		intval($parent_id),
		intval($current_post)
	);

	$arr['id'] = $current_post;
	$arr['parent'] = $parent_id;

	// update the commented timestamp on the parent
	// Only update "commented" if it is really a comment
	if (($arr['verb'] == ACTIVITY_POST) OR !get_config("system", "like_no_comment"))
		q("UPDATE `item` SET `commented` = '%s', `changed` = '%s' WHERE `id` = %d",
			dbesc(datetime_convert()),
			dbesc(datetime_convert()),
			intval($parent_id)
		);
	else
		q("UPDATE `item` SET `changed` = '%s' WHERE `id` = %d",
			dbesc(datetime_convert()),
			intval($parent_id)
		);

	if ($dsprsig) {

		// Friendica servers lower than 3.4.3-2 had double encoded the signature ...
		// We can check for this condition when we decode and encode the stuff again.
		if (base64_encode(base64_decode(base64_decode($dsprsig->signature))) == base64_decode($dsprsig->signature)) {
			$dsprsig->signature = base64_decode($dsprsig->signature);
			logger("Repaired double encoded signature from handle ".$dsprsig->signer, LOGGER_DEBUG);
		}

		q("insert into sign (`iid`,`signed_text`,`signature`,`signer`) values (%d,'%s','%s','%s') ",
			intval($current_post),
			dbesc($dsprsig->signed_text),
			dbesc($dsprsig->signature),
			dbesc($dsprsig->signer)
		);
	}

	$deleted = tag_deliver($arr['uid'],$current_post);

	// current post can be deleted if is for a community page and no mention are
	// in it.
	if (!$deleted AND !$dontcache) {

		$r = q('SELECT * FROM `item` WHERE `id` = %d', intval($current_post));
		if ((dbm::is_result($r)) && (count($r) == 1)) {
			if ($notify) {
				call_hooks('post_local_end', $r[0]);
			} else {
				call_hooks('post_remote_end', $r[0]);
			}
		} else {
			logger('item_store: new item not found in DB, id ' . $current_post);
		}
	}

	if ($arr['parent-uri'] === $arr['uri']) {
		add_thread($current_post);
	} else {
		update_thread($parent_id);
	}

	q("COMMIT");

	// Due to deadlock issues with the "term" table we are doing these steps after the commit.
	// This is not perfect - but a workable solution until we found the reason for the problem.
	create_tags_from_item($current_post);
	create_files_from_item($current_post);

	// If this is now the last-child, force all _other_ children of this parent to *not* be last-child
	// It is done after the transaction to avoid dead locks.
	if ($arr['last-child']) {
		$r = q("UPDATE `item` SET `last-child` = 0 WHERE `parent-uri` = '%s' AND `uid` = %d AND `id` != %d",
			dbesc($arr['uri']),
			intval($arr['uid']),
			intval($current_post)
		);
	}

	if ($arr['parent-uri'] === $arr['uri']) {
		add_shadow_thread($current_post);
	} else {
		add_shadow_entry($current_post);
	}

	check_item_notification($current_post, $uid);

	if ($notify) {
		proc_run(PRIORITY_HIGH, "include/notifier.php", $notify_type, $current_post);
	}

	return $current_post;
}

/**
 * @brief Set "success_update" and "last-item" to the date of the last time we heard from this contact
 *
 * This can be used to filter for inactive contacts.
 * Only do this for public postings to avoid privacy problems, since poco data is public.
 * Don't set this value if it isn't from the owner (could be an author that we don't know)
 *
 * @param array $arr Contains the just posted item record
 */
function item_set_last_item($arr) {

	$update = (!$arr['private'] AND (($arr["author-link"] === $arr["owner-link"]) OR ($arr["parent-uri"] === $arr["uri"])));

	// Is it a forum? Then we don't care about the rules from above
	if (!$update AND ($arr["network"] == NETWORK_DFRN) AND ($arr["parent-uri"] === $arr["uri"])) {
		$isforum = q("SELECT `forum` FROM `contact` WHERE `id` = %d AND `forum`",
				intval($arr['contact-id']));
		if ($isforum) {
			$update = true;
		}
	}

	if ($update) {
		q("UPDATE `contact` SET `success_update` = '%s', `last-item` = '%s' WHERE `id` = %d",
			dbesc($arr['received']),
			dbesc($arr['received']),
			intval($arr['contact-id'])
		);
	}
	// Now do the same for the system wide contacts with uid=0
	if (!$arr['private']) {
		q("UPDATE `contact` SET `success_update` = '%s', `last-item` = '%s' WHERE `id` = %d",
			dbesc($arr['received']),
			dbesc($arr['received']),
			intval($arr['owner-id'])
		);

		if ($arr['owner-id'] != $arr['author-id']) {
			q("UPDATE `contact` SET `success_update` = '%s', `last-item` = '%s' WHERE `id` = %d",
				dbesc($arr['received']),
				dbesc($arr['received']),
				intval($arr['author-id'])
			);
		}
	}
}

function item_body_set_hashtags(&$item) {

	$tags = get_tags($item["body"]);

	// No hashtags?
	if (!count($tags))
		return(false);

	// This sorting is important when there are hashtags that are part of other hashtags
	// Otherwise there could be problems with hashtags like #test and #test2
	rsort($tags);

	$a = get_app();

	$URLSearchString = "^\[\]";

	// All hashtags should point to the home server
	//$item["body"] = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
	//		"#[url=".App::get_baseurl()."/search?tag=$2]$2[/url]", $item["body"]);

	//$item["tag"] = preg_replace("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
	//		"#[url=".App::get_baseurl()."/search?tag=$2]$2[/url]", $item["tag"]);

	// mask hashtags inside of url, bookmarks and attachments to avoid urls in urls
	$item["body"] = preg_replace_callback("/\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
		function ($match){
			return("[url=".str_replace("#", "&num;", $match[1])."]".str_replace("#", "&num;", $match[2])."[/url]");
		},$item["body"]);

	$item["body"] = preg_replace_callback("/\[bookmark\=([$URLSearchString]*)\](.*?)\[\/bookmark\]/ism",
		function ($match){
			return("[bookmark=".str_replace("#", "&num;", $match[1])."]".str_replace("#", "&num;", $match[2])."[/bookmark]");
		},$item["body"]);

	$item["body"] = preg_replace_callback("/\[attachment (.*)\](.*?)\[\/attachment\]/ism",
		function ($match){
			return("[attachment ".str_replace("#", "&num;", $match[1])."]".$match[2]."[/attachment]");
		},$item["body"]);

	// Repair recursive urls
	$item["body"] = preg_replace("/&num;\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",
			"&num;$2", $item["body"]);


	foreach($tags as $tag) {
		if (strpos($tag,'#') !== 0)
			continue;

		if (strpos($tag,'[url='))
			continue;

		$basetag = str_replace('_',' ',substr($tag,1));

		$newtag = '#[url='.App::get_baseurl().'/search?tag='.rawurlencode($basetag).']'.$basetag.'[/url]';

		$item["body"] = str_replace($tag, $newtag, $item["body"]);

		if (!stristr($item["tag"],"/search?tag=".$basetag."]".$basetag."[/url]")) {
			if (strlen($item["tag"]))
				$item["tag"] = ','.$item["tag"];
			$item["tag"] = $newtag.$item["tag"];
		}
	}

	// Convert back the masked hashtags
	$item["body"] = str_replace("&num;", "#", $item["body"]);
}

function get_item_guid($id) {
	$r = q("SELECT `guid` FROM `item` WHERE `id` = %d LIMIT 1", intval($id));
	if (dbm::is_result($r))
		return($r[0]["guid"]);
	else
		return("");
}

function get_item_id($guid, $uid = 0) {

	$nick = "";
	$id = 0;

	if ($uid == 0)
		$uid == local_user();

	// Does the given user have this item?
	if ($uid) {
		$r = q("SELECT `item`.`id`, `user`.`nickname` FROM `item` INNER JOIN `user` ON `user`.`uid` = `item`.`uid`
			WHERE `item`.`visible` = 1 AND `item`.`deleted` = 0 and `item`.`moderated` = 0
				AND `item`.`guid` = '%s' AND `item`.`uid` = %d", dbesc($guid), intval($uid));
		if (dbm::is_result($r)) {
			$id = $r[0]["id"];
			$nick = $r[0]["nickname"];
		}
	}

	// Or is it anywhere on the server?
	if ($nick == "") {
		$r = q("SELECT `item`.`id`, `user`.`nickname` FROM `item` INNER JOIN `user` ON `user`.`uid` = `item`.`uid`
			WHERE `item`.`visible` = 1 AND `item`.`deleted` = 0 and `item`.`moderated` = 0
				AND `item`.`allow_cid` = ''  AND `item`.`allow_gid` = ''
				AND `item`.`deny_cid`  = '' AND `item`.`deny_gid`  = ''
				AND `item`.`private` = 0 AND `item`.`wall` = 1
				AND `item`.`guid` = '%s'", dbesc($guid));
		if (dbm::is_result($r)) {
			$id = $r[0]["id"];
			$nick = $r[0]["nickname"];
		}
	}
	return(array("nick" => $nick, "id" => $id));
}

// return - test
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;
}

/**
 * look for mention tags and setup a second delivery chain for forum/community posts if appropriate
 * @param int $uid
 * @param int $item_id
 * @return bool true if item was deleted, else false
 */
function tag_deliver($uid,$item_id) {

	//

	$a = get_app();

	$mention = false;

	$u = q("select * from user where uid = %d limit 1",
		intval($uid)
	);

	if (! dbm::is_result($u)) {
		return;
	}

	$community_page = (($u[0]['page-flags'] == PAGE_COMMUNITY) ? true : false);
	$prvgroup = (($u[0]['page-flags'] == PAGE_PRVGROUP) ? true : false);


	$i = q("SELECT * FROM `item` WHERE `id` = %d AND `uid` = %d LIMIT 1",
		intval($item_id),
		intval($uid)
	);
	if (! dbm::is_result($i)) {
		return;
	}

	$item = $i[0];

	$link = normalise_link(App::get_baseurl() . '/profile/' . $u[0]['nickname']);

	// Diaspora uses their own hardwired link URL in @-tags
	// instead of the one we supply with webfinger

	$dlink = normalise_link(App::get_baseurl() . '/u/' . $u[0]['nickname']);

	$cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism',$item['body'],$matches,PREG_SET_ORDER);
	if ($cnt) {
		foreach($matches as $mtch) {
			if (link_compare($link,$mtch[1]) || link_compare($dlink,$mtch[1])) {
				$mention = true;
				logger('tag_deliver: mention found: ' . $mtch[2]);
			}
		}
	}

	if (! $mention){
		if ( ($community_page || $prvgroup) &&
			  (!$item['wall']) && (!$item['origin']) && ($item['id'] == $item['parent'])){
			// mmh.. no mention.. community page or private group... no wall.. no origin.. top-post (not a comment)
			// delete it!
			logger("tag_deliver: no-mention top-level post to communuty or private group. delete.");
			q("DELETE FROM item WHERE id = %d and uid = %d",
				intval($item_id),
				intval($uid)
			);
			return true;
		}
		return;
	}

	$arr = array('item' => $item, 'user' => $u[0], 'contact' => $r[0]);

	call_hooks('tagged', $arr);

	if ((! $community_page) && (! $prvgroup))
		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 (($item['wall']) || ($item['origin']) || ($item['id'] != $item['parent']))
		return;

	// now change this copy of the post to a forum head message and deliver to all the tgroup members


	$c = q("select name, url, thumb from contact where self = 1 and uid = %d limit 1",
		intval($u[0]['uid'])
	);
	if (! dbm::is_result($c)) {
		return;
	}

	// also reset all the privacy bits to the forum default permissions

	$private = ($u[0]['allow_cid'] || $u[0]['allow_gid'] || $u[0]['deny_cid'] || $u[0]['deny_gid']) ? 1 : 0;

	$forum_mode = (($prvgroup) ? 2 : 1);

	q("UPDATE `item` SET `wall` = 1, `origin` = 1, `forum_mode` = %d, `owner-name` = '%s', `owner-link` = '%s', `owner-avatar` = '%s',
		`private` = %d, `allow_cid` = '%s', `allow_gid` = '%s', `deny_cid` = '%s', `deny_gid` = '%s'  WHERE `id` = %d",
		intval($forum_mode),
		dbesc($c[0]['name']),
		dbesc($c[0]['url']),
		dbesc($c[0]['thumb']),
		intval($private),
		dbesc($u[0]['allow_cid']),
		dbesc($u[0]['allow_gid']),
		dbesc($u[0]['deny_cid']),
		dbesc($u[0]['deny_gid']),
		intval($item_id)
	);
	update_thread($item_id);

	proc_run(PRIORITY_HIGH,'include/notifier.php', 'tgroup', $item_id);

}



function tgroup_check($uid,$item) {

	$mention = false;

	// check that the message originated elsewhere and is a top-level post

	if (($item['wall']) || ($item['origin']) || ($item['uri'] != $item['parent-uri']))
		return false;

	/// @TODO Encapsulate this or find it encapsulated and replace all occurrances
	$u = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1",
		intval($uid)
	);
	if (! dbm::is_result($u)) {
		return false;
	}

	$community_page = (($u[0]['page-flags'] == PAGE_COMMUNITY) ? true : false);
	$prvgroup = (($u[0]['page-flags'] == PAGE_PRVGROUP) ? true : false);


	$link = normalise_link(App::get_baseurl() . '/profile/' . $u[0]['nickname']);

	// Diaspora uses their own hardwired link URL in @-tags
	// instead of the one we supply with webfinger

	$dlink = normalise_link(App::get_baseurl() . '/u/' . $u[0]['nickname']);

	$cnt = preg_match_all('/[\@\!]\[url\=(.*?)\](.*?)\[\/url\]/ism',$item['body'],$matches,PREG_SET_ORDER);
	if ($cnt) {
		foreach ($matches as $mtch) {
			if (link_compare($link,$mtch[1]) || link_compare($dlink,$mtch[1])) {
				$mention = true;
				logger('tgroup_check: mention found: ' . $mtch[2]);
			}
		}
	}

	if (! $mention) {
		return false;
	}

	/// @TODO Combines both return statements into one
	return (($community_page) || ($prvgroup));
}

/*
  This function returns true if $update has an edited timestamp newer
  than $existing, i.e. $update contains new data which should override
  what's already there.  If there is no timestamp yet, the update is
  assumed to be newer.  If the update has no timestamp, the existing
  item is assumed to be up-to-date.  If the timestamps are equal it
  assumes the update has been seen before and should be ignored.
  */
function edited_timestamp_is_newer($existing, $update) {
	if (!x($existing,'edited') || !$existing['edited']) {
		return true;
	}
	if (!x($update,'edited') || !$update['edited']) {
		return false;
	}

	$existing_edited = datetime_convert('UTC', 'UTC', $existing['edited']);
	$update_edited = datetime_convert('UTC', 'UTC', $update['edited']);
	return (strcmp($existing_edited, $update_edited) < 0);
}

/**
 *
 * consume_feed - process atom feed and update anything/everything we might need to update
 *
 * $xml = the (atom) feed to consume - RSS isn't as fully supported but may work for simple feeds.
 *
 * $importer = the contact_record (joined to user_record) of the local user who owns this relationship.
 *             It is this person's stuff that is going to be updated.
 * $contact =  the person who is sending us stuff. If not set, we MAY be processing a "follow" activity
 *             from an external network and MAY create an appropriate contact record. Otherwise, we MUST
 *             have a contact record.
 * $hub = should we find a hub declation in the feed, pass it back to our calling process, who might (or
 *        might not) try and subscribe to it.
 * $datedir sorts in reverse order
 * $pass - by default ($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,&$contact, &$hub, $datedir = 0, $pass = 0) {
	if ($contact['network'] === NETWORK_OSTATUS) {
		if ($pass < 2) {
			// Test - remove before flight
			//$tempfile = tempnam(get_temppath(), "ostatus2");
			//file_put_contents($tempfile, $xml);
			logger("Consume OStatus messages ", LOGGER_DEBUG);
			ostatus::import($xml,$importer,$contact, $hub);
		}
		return;
	}

	if ($contact['network'] === NETWORK_FEED) {
		if ($pass < 2) {
			logger("Consume feeds", LOGGER_DEBUG);
			feed_import($xml,$importer,$contact, $hub);
		}
		return;
	}

	if ($contact['network'] === NETWORK_DFRN) {
		logger("Consume DFRN messages", LOGGER_DEBUG);

		$r = q("SELECT  `contact`.*, `contact`.`uid` AS `importer_uid`,
					`contact`.`pubkey` AS `cpubkey`,
					`contact`.`prvkey` AS `cprvkey`,
					`contact`.`thumb` AS `thumb`,
					`contact`.`url` as `url`,
					`contact`.`name` as `senderName`,
					`user`.*
			FROM `contact`
			LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
			WHERE `contact`.`id` = %d AND `user`.`uid` = %d",
			dbesc($contact["id"]), dbesc($importer["uid"])
		);
		if ($r) {
			logger("Now import the DFRN feed");
			dfrn::import($xml,$r[0], true);
			return;
		}
	}
}

function item_is_remote_self($contact, &$datarray) {
	$a = get_app();

	if (!$contact['remote_self'])
		return false;

	// Prevent the forwarding of posts that are forwarded
	if ($datarray["extid"] == NETWORK_DFRN)
		return false;

	// Prevent to forward already forwarded posts
	if ($datarray["app"] == $a->get_hostname())
		return false;

	// Only forward posts
	if ($datarray["verb"] != ACTIVITY_POST)
		return false;

	if (($contact['network'] != NETWORK_FEED) AND $datarray['private'])
		return false;

	$datarray2 = $datarray;
	logger('remote-self start - Contact '.$contact['url'].' - '.$contact['remote_self'].' Item '.print_r($datarray, true), LOGGER_DEBUG);
	if ($contact['remote_self'] == 2) {
		$r = q("SELECT `id`,`url`,`name`,`thumb` FROM `contact` WHERE `uid` = %d AND `self`",
			intval($contact['uid']));
		if (dbm::is_result($r)) {
			$datarray['contact-id'] = $r[0]["id"];

			$datarray['owner-name'] = $r[0]["name"];
			$datarray['owner-link'] = $r[0]["url"];
			$datarray['owner-avatar'] = $r[0]["thumb"];

			$datarray['author-name']   = $datarray['owner-name'];
			$datarray['author-link']   = $datarray['owner-link'];
			$datarray['author-avatar'] = $datarray['owner-avatar'];
		}

		if ($contact['network'] != NETWORK_FEED) {
			$datarray["guid"] = get_guid(32);
			unset($datarray["plink"]);
			$datarray["uri"] = item_new_uri($a->get_hostname(),$contact['uid'], $datarray["guid"]);
			$datarray["parent-uri"] = $datarray["uri"];
			$datarray["extid"] = $contact['network'];
			$urlpart = parse_url($datarray2['author-link']);
			$datarray["app"] = $urlpart["host"];
		} else
			$datarray['private'] = 0;
	}

	if ($contact['network'] != NETWORK_FEED) {
		// Store the original post
		$r = item_store($datarray2, false, false);
		logger('remote-self post original item - Contact '.$contact['url'].' return '.$r.' Item '.print_r($datarray2, true), LOGGER_DEBUG);
	} else
		$datarray["app"] = "Feed";

	return true;
}

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

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

	if (is_array($contact)) {
		if (($contact['network'] == NETWORK_OSTATUS && $contact['rel'] == CONTACT_IS_SHARING)
			|| ($sharing && $contact['rel'] == CONTACT_IS_FOLLOWER)) {
			$r = q("UPDATE `contact` SET `rel` = %d, `writable` = 1 WHERE `id` = %d AND `uid` = %d",
				intval(CONTACT_IS_FRIEND),
				intval($contact['id']),
				intval($importer['uid'])
			);
		}
		// send email notification to owner?
	} else {

		// create contact record

		$r = q("INSERT INTO `contact` (`uid`, `created`, `url`, `nurl`, `name`, `nick`, `photo`, `network`, `rel`,
			`blocked`, `readonly`, `pending`, `writable`)
			VALUES (%d, '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d, 0, 0, 1, 1)",
			intval($importer['uid']),
			dbesc(datetime_convert()),
			dbesc($url),
			dbesc(normalise_link($url)),
			dbesc($name),
			dbesc($nick),
			dbesc($photo),
			dbesc(($sharing) ? NETWORK_ZOT : NETWORK_OSTATUS),
			intval(($sharing) ? CONTACT_IS_SHARING : CONTACT_IS_FOLLOWER)
		);
		$r = q("SELECT `id`, `network` FROM `contact` WHERE `uid` = %d AND `url` = '%s' AND `pending` = 1 LIMIT 1",
				intval($importer['uid']),
				dbesc($url)
		);
		if (dbm::is_result($r)) {
			$contact_record = $r[0];
			update_contact_avatar($photo, $importer["uid"], $contact_record["id"], true);
		}


		$r = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1",
			intval($importer['uid'])
		);
		$a = get_app();

		if (dbm::is_result($r) AND !in_array($r[0]['page-flags'], array(PAGE_SOAPBOX, PAGE_FREELOVE))) {

			// create notification
			$hash = random_string();

			if (is_array($contact_record)) {
				$ret = q("INSERT INTO `intro` ( `uid`, `contact-id`, `blocked`, `knowyou`, `hash`, `datetime`)
					VALUES ( %d, %d, 0, 0, '%s', '%s' )",
					intval($importer['uid']),
					intval($contact_record['id']),
					dbesc($hash),
					dbesc(datetime_convert())
				);
			}

			$def_gid = get_default_group($importer['uid'], $contact_record["network"]);

			if (intval($def_gid))
				group_add_member($importer['uid'],'',$contact_record['id'],$def_gid);

			if (($r[0]['notify-flags'] & NOTIFY_INTRO) &&
				in_array($r[0]['page-flags'], array(PAGE_NORMAL))) {

				notification(array(
					'type'         => NOTIFY_INTRO,
					'notify_flags' => $r[0]['notify-flags'],
					'language'     => $r[0]['language'],
					'to_name'      => $r[0]['username'],
					'to_email'     => $r[0]['email'],
					'uid'          => $r[0]['uid'],
					'link'		   => App::get_baseurl() . '/notifications/intro',
					'source_name'  => ((strlen(stripslashes($contact_record['name']))) ? stripslashes($contact_record['name']) : t('[Name Withheld]')),
					'source_link'  => $contact_record['url'],
					'source_photo' => $contact_record['photo'],
					'verb'         => ($sharing ? ACTIVITY_FRIEND : ACTIVITY_FOLLOW),
					'otype'        => 'intro'
				));

			}
		} elseif (dbm::is_result($r) AND in_array($r[0]['page-flags'], array(PAGE_SOAPBOX, PAGE_FREELOVE))) {
			$r = q("UPDATE `contact` SET `pending` = 0 WHERE `uid` = %d AND `url` = '%s' AND `pending` LIMIT 1",
					intval($importer['uid']),
					dbesc($url)
			);
		}

	}
}

function lose_follower($importer,$contact,$datarray = array(),$item = "") {

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

function lose_sharer($importer,$contact,$datarray = array(),$item = "") {

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

function subscribe_to_hub($url,$importer,$contact,$hubmode = 'subscribe') {

	$a = get_app();

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

	// Diaspora has different message-ids in feeds than they do
	// through the direct Diaspora protocol. If we try and use
	// the feed, we'll get duplicates. So don't.

	if ((! dbm::is_result($r)) || $contact['network'] === NETWORK_DIASPORA)
		return;

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

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

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

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

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

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

	post_url($url,$params);

	logger('subscribe_to_hub: returns: ' . $a->get_curl_code(), LOGGER_DEBUG);

	return;

}

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

	if (get_config('system','disable_embedded'))
		return $s;

	$a = get_app();

	logger('fix_private_photos: check for photos', LOGGER_DEBUG);
	$site = substr(App::get_baseurl(),strpos(App::get_baseurl(),'://'));

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

	$img_start = strpos($orig_body, '[img');
	$img_st_close = ($img_start !== false ? strpos(substr($orig_body, $img_start), ']') : false);
	$img_len = ($img_start !== false ? strpos(substr($orig_body, $img_start + $img_st_close + 1), '[/img]') : false);
	while ( ($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);
			$i = str_replace(array('.jpg','.png','.gif'),array('','',''),$i);
			$x = strpos($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 ($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("/\[img\=([0-9]*)x([0-9]*)\]/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]);

							$ph = new Photo($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 . '[/img]';
		$orig_body = substr($orig_body, $img_start + $img_st_close + $img_len + strlen('[/img]'));
		if ($orig_body === false)
			$orig_body = '';

		$img_start = strpos($orig_body, '[img');
		$img_st_close = ($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), '[/img]') : 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;
}

// returns an array of contact-ids that are allowed to see this object

function enumerate_permissions($obj) {
	$allow_people = expand_acl($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) {
	$ret = array();
	$matches = false;
	$cnt = preg_match_all('|\#\[url\=(.*?)\](.*?)\[\/url\]|',$item['tag'],$matches);
	if ($cnt) {
		for($x = 0; $x < $cnt; $x ++) {
			if ($matches[1][$x])
				$ret[$matches[2][$x]] = array('#',$matches[1][$x], $matches[2][$x]);
		}
	}
	$matches = false;
	$cnt = preg_match_all('|\@\[url\=(.*?)\](.*?)\[\/url\]|',$item['tag'],$matches);
	if ($cnt) {
		for($x = 0; $x < $cnt; $x ++) {
			if ($matches[1][$x])
				$ret[] = array('@',$matches[1][$x], $matches[2][$x]);
		}
	}
	return $ret;
}

function item_expire($uid, $days, $network = "", $force = false) {

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

	// $expire_network_only = save your own wall posts
	// and just expire conversations started by others

	$expire_network_only = get_pconfig($uid,'expire','network_only');
	$sql_extra = ((intval($expire_network_only)) ? " AND wall = 0 " : "");

	if ($network != "") {
		$sql_extra .= sprintf(" AND network = '%s' ", dbesc($network));
		// There is an index "uid_network_received" but not "uid_network_created"
		// This avoids the creation of another index just for one purpose.
		// And it doesn't really matter wether to look at "received" or "created"
		$range = "AND `received` < UTC_TIMESTAMP() - INTERVAL %d DAY ";
	} else
		$range = "AND `created` < UTC_TIMESTAMP() - INTERVAL %d DAY ";

	$r = q("SELECT `file`, `resource-id`, `starred`, `type`, `id` FROM `item`
		WHERE `uid` = %d $range
		AND `id` = `parent`
		$sql_extra
		AND `deleted` = 0",
		intval($uid),
		intval($days)
	);

	if (! dbm::is_result($r))
		return;

	$expire_items = get_pconfig($uid, 'expire','items');
	$expire_items = (($expire_items===false)?1:intval($expire_items)); // default if not set: 1

	// Forcing expiring of items - but not notes and marked items
	if ($force)
		$expire_items = true;

	$expire_notes = get_pconfig($uid, 'expire','notes');
	$expire_notes = (($expire_notes===false)?1:intval($expire_notes)); // default if not set: 1

	$expire_starred = get_pconfig($uid, 'expire','starred');
	$expire_starred = (($expire_starred===false)?1:intval($expire_starred)); // default if not set: 1

	$expire_photos = get_pconfig($uid, 'expire','photos');
	$expire_photos = (($expire_photos===false)?0:intval($expire_photos)); // default if not set: 0

	logger('expire: # items=' . count($r). "; expire items: $expire_items, expire notes: $expire_notes, expire starred: $expire_starred, expire photos: $expire_photos");

	foreach($r as $item) {

		// don't expire filed items

		if (strpos($item['file'],'[') !== false)
			continue;

		// Only expire posts, not photos and photo comments

		if ($expire_photos==0 && strlen($item['resource-id']))
			continue;
		if ($expire_starred==0 && intval($item['starred']))
			continue;
		if ($expire_notes==0 && $item['type']=='note')
			continue;
		if ($expire_items==0 && $item['type']!='note')
			continue;

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

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

}


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

	if (! local_user() && ! remote_user())
		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(PRIORITY_HIGH,"include/notifier.php", "expire", $uid);
}


function drop_item($id,$interactive = true) {

	$a = get_app();

	// locate item to be deleted

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

	if (! dbm::is_result($r)) {
		if (! $interactive)
			return 0;
		notice( t('Item not found.') . EOL);
		goaway(App::get_baseurl() . '/' . $_SESSION['return_url']);
	}

	$item = $r[0];

	$owner = $item['uid'];

	$contact_id = 0;

	// check if logged in user is either the author or owner of this item

	if (is_array($_SESSION['remote'])) {
		foreach($_SESSION['remote'] as $visitor) {
			if ($visitor['uid'] == $item['uid'] && $visitor['cid'] == $item['contact-id']) {
				$contact_id = $visitor['cid'];
				break;
			}
		}
	}


	if ((local_user() == $item['uid']) || ($contact_id) || (! $interactive)) {

		// Check if we should do HTML-based delete confirmation
		if ($_REQUEST['confirm']) {
			// <form> can't take arguments in its "action" parameter
			// so add any arguments as hidden inputs
			$query = explode_querystring($a->query_string);
			$inputs = array();
			foreach($query['args'] as $arg) {
				if (strpos($arg, 'confirm=') === false) {
					$arg_parts = explode('=', $arg);
					$inputs[] = array('name' => $arg_parts[0], 'value' => $arg_parts[1]);
				}
			}

			return replace_macros(get_markup_template('confirm.tpl'), array(
				'$method' => 'get',
				'$message' => t('Do you really want to delete this item?'),
				'$extra_inputs' => $inputs,
				'$confirm' => t('Yes'),
				'$confirm_url' => $query['base'],
				'$confirm_name' => 'confirmed',
				'$cancel' => t('Cancel'),
			));
		}
		// Now check how the user responded to the confirmation query
		if ($_REQUEST['canceled']) {
			goaway(App::get_baseurl() . '/' . $_SESSION['return_url']);
		}

		logger('delete item: ' . $item['id'], LOGGER_DEBUG);
		// delete the item

		$r = q("UPDATE `item` SET `deleted` = 1, `title` = '', `body` = '', `edited` = '%s', `changed` = '%s' WHERE `id` = %d",
			dbesc(datetime_convert()),
			dbesc(datetime_convert()),
			intval($item['id'])
		);
		create_tags_from_item($item['id']);
		create_files_from_item($item['id']);
		delete_thread($item['id'], $item['parent-uri']);

		// clean up categories and tags so they don't end up as orphans

		$matches = false;
		$cnt = preg_match_all('/<(.*?)>/',$item['file'],$matches,PREG_SET_ORDER);
		if ($cnt) {
			foreach($matches as $mtch) {
				file_tag_unsave_file($item['uid'],$item['id'],$mtch[1],true);
			}
		}

		$matches = false;

		$cnt = preg_match_all('/\[(.*?)\]/',$item['file'],$matches,PREG_SET_ORDER);
		if ($cnt) {
			foreach($matches as $mtch) {
				file_tag_unsave_file($item['uid'],$item['id'],$mtch[1],false);
			}
		}

		// If item is a link to a photo resource, nuke all the associated photos
		// (visitors will not have photo resources)
		// This only applies to photos uploaded from the photos page. Photos inserted into a post do not
		// generate a resource-id and therefore aren't intimately linked to the item.

		if (strlen($item['resource-id'])) {
			q("DELETE FROM `photo` WHERE `resource-id` = '%s' AND `uid` = %d ",
				dbesc($item['resource-id']),
				intval($item['uid'])
			);
			// ignore the result
		}

		// If item is a link to an event, nuke the event record.

		if (intval($item['event-id'])) {
			q("DELETE FROM `event` WHERE `id` = %d AND `uid` = %d",
				intval($item['event-id']),
				intval($item['uid'])
			);
			// ignore the result
		}

		// If item has attachments, drop them

		foreach(explode(",",$item['attach']) as $attach){
			preg_match("|attach/(\d+)|", $attach, $matches);
			q("DELETE FROM `attach` WHERE `id` = %d AND `uid` = %d",
				intval($matches[1]),
				local_user()
			);
			// ignore the result
		}


		// clean up item_id and sign meta-data tables

		/*
		// Old code - caused very long queries and warning entries in the mysql logfiles:

		$r = q("DELETE FROM item_id where iid in (select id from item where parent = %d and uid = %d)",
			intval($item['id']),
			intval($item['uid'])
		);

		$r = q("DELETE FROM sign where iid in (select id from item where parent = %d and uid = %d)",
			intval($item['id']),
			intval($item['uid'])
		);
		*/

		// The new code splits the queries since the mysql optimizer really has bad problems with subqueries

		// Creating list of parents
		$r = q("select id from item where parent = %d and uid = %d",
			intval($item['id']),
			intval($item['uid'])
		);

		$parentid = "";

		foreach ($r AS $row) {
			if ($parentid != "")
				$parentid .= ", ";

			$parentid .= $row["id"];
		}

		// Now delete them
		if ($parentid != "") {
			$r = q("DELETE FROM item_id where iid in (%s)", dbesc($parentid));

			$r = q("DELETE FROM sign where iid in (%s)", dbesc($parentid));
		}

		// If it's the parent of a comment thread, kill all the kids

		if ($item['uri'] == $item['parent-uri']) {
			$r = q("UPDATE `item` SET `deleted` = 1, `edited` = '%s', `changed` = '%s', `body` = '' , `title` = ''
				WHERE `parent-uri` = '%s' AND `uid` = %d ",
				dbesc(datetime_convert()),
				dbesc(datetime_convert()),
				dbesc($item['parent-uri']),
				intval($item['uid'])
			);
			create_tags_from_itemuri($item['parent-uri'], $item['uid']);
			create_files_from_itemuri($item['parent-uri'], $item['uid']);
			delete_thread_uri($item['parent-uri'], $item['uid']);
			// ignore the result
		} else {
			// ensure that last-child is set in case the comment that had it just got wiped.
			q("UPDATE `item` SET `last-child` = 0, `changed` = '%s' WHERE `parent-uri` = '%s' AND `uid` = %d ",
				dbesc(datetime_convert()),
				dbesc($item['parent-uri']),
				intval($item['uid'])
			);
			// who is the last child now?
			$r = q("SELECT `id` FROM `item` WHERE `parent-uri` = '%s' AND `type` != 'activity' AND `deleted` = 0 AND `uid` = %d ORDER BY `edited` DESC LIMIT 1",
				dbesc($item['parent-uri']),
				intval($item['uid'])
			);
			if (dbm::is_result($r)) {
				q("UPDATE `item` SET `last-child` = 1 WHERE `id` = %d",
					intval($r[0]['id'])
				);
			}
		}

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

		// send the notification upstream/downstream as the case may be

		proc_run(PRIORITY_HIGH,"include/notifier.php", "drop", $drop_id);

		if (! $interactive)
			return $owner;
		goaway(App::get_baseurl() . '/' . $_SESSION['return_url']);
		//NOTREACHED
	} else {
		if (! $interactive)
			return 0;
		notice( t('Permission denied.') . EOL);
		goaway(App::get_baseurl() . '/' . $_SESSION['return_url']);
		//NOTREACHED
	}

}


function first_post_date($uid,$wall = false) {
	$r = q("select id, created from item
		where uid = %d and wall = %d and deleted = 0 and visible = 1 AND moderated = 0
		and id = parent
		order by created asc limit 1",
		intval($uid),
		intval($wall ? 1 : 0)
	);
	if (dbm::is_result($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 */
function list_post_dates($uid, $wall) {
	$dnow = datetime_convert('',date_default_timezone_get(),'now','Y-m-d');

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

	// Set the start and end date to the beginning of the month
	$dnow = substr($dnow,0,8).'01';
	$dthen = substr($dthen,0,8).'01';

	$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();

	// Set the start and end date to the beginning of the month
	$dnow = substr($dnow,0,8).'01';
	$dthen = substr($dthen,0,8).'01';

	$ret = array();
	// Starting with the current month, get the first and last days of every
	// month down to and including the month of the first post
	while (substr($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 posted_date_widget($url,$uid,$wall) {
	$o = '';

	if (! feature_enabled($uid,'archives'))
		return $o;

	// For former Facebook folks that left because of "timeline"

/*	if ($wall && intval(get_pconfig($uid,'system','no_wall_archive_widget')))
		return $o;*/

	$visible_years = get_pconfig($uid,'system','archive_visible_years');
	if (! $visible_years)
		$visible_years = 5;

	$ret = list_post_dates($uid,$wall);

	if (! dbm::is_result($ret))
		return $o;

	$cutoff_year = intval(datetime_convert('',date_default_timezone_get(),'now','Y')) - $visible_years;
	$cutoff = ((array_key_exists($cutoff_year,$ret))? true : false);

	$o = replace_macros(get_markup_template('posted_date_widget.tpl'),array(
		'$title' => t('Archives'),
		'$size' => $visible_years,
		'$cutoff_year' => $cutoff_year,
		'$cutoff' => $cutoff,
		'$url' => $url,
		'$dates' => $ret,
		'$showmore' => t('show more')

	));
	return $o;
}