path: root/Zotlabs/Module/Item.php

<?php

namespace Zotlabs\Module;

use Zotlabs\Lib\Config;
use Zotlabs\Lib\IConfig;
use Zotlabs\Lib\Enotify;
use Zotlabs\Web\Controller;
use Zotlabs\Daemon\Master;
use Zotlabs\Lib\Activity;
use Zotlabs\Lib\ActivityStreams;
use Zotlabs\Lib\LDSignatures;
use Zotlabs\Web\HTTPSig;
use Zotlabs\Lib\Libzot;
use Zotlabs\Lib\Libsync;
use Zotlabs\Lib\ThreadListener;
use Zotlabs\Access\PermissionRoles;
use App;

require_once('include/crypto.php');
require_once('include/items.php');
require_once('include/security.php');


/**
 *
 * This is the POST destination for most all locally posted
 * text stuff. This function handles status, wall-to-wall status, 
 * local comments, and remote coments that are posted on this site 
 * (as opposed to being delivered in a feed).
 * Also processed here are posts and comments coming through the 
 * statusnet/twitter API. 
 * All of these become an "item" which is our basic unit of 
 * information.
 * Posts that originate externally or do not fall into the above 
 * posting categories go through item_store() instead of this function. 
 *
 */  


class Item extends Controller {


	function init() {

		if (Libzot::is_zot_request()) {

			$conversation = false;

			$item_id = argv(1);

			if(! $item_id)
				http_status_exit(404, 'Not found');

			$portable_id = EMPTY_STR;

			$item_normal = " and item.item_hidden = 0 and item.item_type = 0 and item.item_unpublished = 0 and item.item_delayed = 0 and item.item_blocked = 0 ";

			$i = null;

			// do we have the item (at all)?

			$r = q("select * from item where mid = '%s' $item_normal limit 1",
				dbesc(z_root() . '/item/' . $item_id)
			);

			if (! $r) {
				http_status_exit(404,'Not found');
			}

			// process an authenticated fetch

			$sigdata = HTTPSig::verify(($_SERVER['REQUEST_METHOD'] === 'POST') ? file_get_contents('php://input') : EMPTY_STR);
			if ($sigdata['portable_id'] && $sigdata['header_valid']) {
				$portable_id = $sigdata['portable_id'];
				if (! check_channelallowed($portable_id)) {
					http_status_exit(403, 'Permission denied');
				}
				if (! check_siteallowed($sigdata['signer'])) {
					http_status_exit(403, 'Permission denied');
				}
				observer_auth($portable_id);

				$i = q("select id as item_id from item where mid = '%s' $item_normal and owner_xchan = '%s' limit 1",
					dbesc($r[0]['parent_mid']),
					dbesc($portable_id)
				);
			}
			elseif (Config::get('system','require_authenticated_fetch',false)) {
				http_status_exit(403,'Permission denied');
			}

			// if we don't have a parent id belonging to the signer see if we can obtain one as a visitor that we have permission to access
			// with a bias towards those items owned by channels on this site (item_wall = 1)

			$sql_extra = item_permissions_sql(0);

			if (! $i) {
				$i = q("select id as item_id from item where mid = '%s' $item_normal $sql_extra order by item_wall desc limit 1",
					dbesc($r[0]['parent_mid'])
				);
			}

			if(! $i) {
				http_status_exit(403,'Forbidden');
			}

			$parents_str = ids_to_querystr($i,'item_id');
	
			$items = q("SELECT item.*, item.id AS item_id FROM item WHERE item.parent IN ( %s ) $item_normal order by item.id asc",
				dbesc($parents_str)
			);

			if(! $items) {
				http_status_exit(404, 'Not found');
			}

			xchan_query($items,true);
			$items = fetch_post_tags($items,true);

			if(! $items)
				http_status_exit(404, 'Not found');

			$chan = channelx_by_n($items[0]['uid']);

			if(! $chan)
				http_status_exit(404, 'Not found');

			if(! perm_is_allowed($chan['channel_id'],get_observer_hash(),'view_stream'))
				http_status_exit(403, 'Forbidden');


			$i = Activity::encode_item_collection($items, 'conversation/' . $item_id, 'OrderedCollection');
			if($portable_id) {
				ThreadListener::store(z_root() . '/item/' . $item_id,$portable_id);
			}

			if(! $i)
				http_status_exit(404, 'Not found');

			$x = array_merge(['@context' => [
				ACTIVITYSTREAMS_JSONLD_REV,
				'https://w3id.org/security/v1',
				z_root() . ZOT_APSCHEMA_REV
				]], $i);

			$headers = [];
			$headers['Content-Type'] = 'application/x-zot+json' ;
			$x['signature'] = LDSignatures::sign($x,$chan);
			$ret = json_encode($x, JSON_UNESCAPED_SLASHES);
			$headers['Digest'] = HTTPSig::generate_digest_header($ret);
			$headers['(request-target)'] = strtolower($_SERVER['REQUEST_METHOD']) . ' ' . $_SERVER['REQUEST_URI'];
			$h = HTTPSig::create_sig($headers,$chan['channel_prvkey'],channel_url($chan));
			HTTPSig::set_headers($h);
			echo $ret;
			killme();

		}

		if(ActivityStreams::is_as_request()) {

			$item_id = argv(1);
			if(! $item_id)
				http_status_exit(404, 'Not found');

			$portable_id = EMPTY_STR;

			$item_normal = " and item.item_hidden = 0 and item.item_type = 0 and item.item_unpublished = 0 and item.item_delayed = 0 and item.item_blocked = 0 ";

			$i = null;

			// do we have the item (at all)?
			// add preferential bias to item owners (item_wall = 1)

			$r = q("select * from item where mid = '%s' or uuid = '%s' $item_normal order by item_wall desc limit 1",
				dbesc(z_root() . '/item/' . $item_id),
				dbesc($item_id)
			);

			if (! $r) {
				http_status_exit(404,'Not found');
			}

			// process an authenticated fetch

			$sigdata = HTTPSig::verify(EMPTY_STR);
			if ($sigdata['portable_id'] && $sigdata['header_valid']) {
				$portable_id = $sigdata['portable_id'];
				if (! check_channelallowed($portable_id)) {
					http_status_exit(403, 'Permission denied');
				}
				if (! check_siteallowed($sigdata['signer'])) {
					http_status_exit(403, 'Permission denied');
				}
				observer_auth($portable_id);

				$i = q("select id as item_id from item where mid = '%s' $item_normal and owner_xchan = '%s' limit 1 ",
					dbesc($r[0]['parent_mid']),
					dbesc($portable_id)
				);
			}
			elseif (Config::get('system','require_authenticated_fetch',false)) {
				http_status_exit(403,'Permission denied');
			}

			// if we don't have a parent id belonging to the signer see if we can obtain one as a visitor that we have permission to access
			// with a bias towards those items owned by channels on this site (item_wall = 1)

			$sql_extra = item_permissions_sql(0);

			if (! $i) {
				$i = q("select id as item_id from item where mid = '%s' $item_normal $sql_extra order by item_wall desc limit 1",
					dbesc($r[0]['parent_mid'])
				);
			}

			if(! $i) {
				http_status_exit(403,'Forbidden');
			}

			// If we get to this point we have determined we can access the original in $r (fetched much further above), so use it.

			xchan_query($r,true);
			$items = fetch_post_tags($r,false);

			$chan = channelx_by_n($items[0]['uid']);

			if(! $chan)
				http_status_exit(404, 'Not found');

			if(! perm_is_allowed($chan['channel_id'],get_observer_hash(),'view_stream'))
				http_status_exit(403, 'Forbidden');

			$i = Activity::encode_item($items[0],true);

			if(! $i)
				http_status_exit(404, 'Not found');

			$x = array_merge(['@context' => [
				ACTIVITYSTREAMS_JSONLD_REV,
				'https://w3id.org/security/v1',
				z_root() . ZOT_APSCHEMA_REV
				]], $i);

			$headers = [];
			$headers['Content-Type'] = 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"' ;
			$x['signature'] = LDSignatures::sign($x,$chan);
			$ret = json_encode($x, JSON_UNESCAPED_SLASHES);
			$headers['Date'] = datetime_convert('UTC','UTC', 'now', 'D, d M Y H:i:s \\G\\M\\T');
			$headers['Digest'] = HTTPSig::generate_digest_header($ret);
			$headers['(request-target)'] = strtolower($_SERVER['REQUEST_METHOD']) . ' ' . $_SERVER['REQUEST_URI'];
			$h = HTTPSig::create_sig($headers,$chan['channel_prvkey'],channel_url($chan));
			HTTPSig::set_headers($h);
			echo $ret;
			killme();

		}


		if(argc() > 1 && argv(1) !== 'drop') {
			$x = q("select uid, item_wall, llink, mid from item where mid = '%s' or mid = '%s' ",
				dbesc(z_root() . '/item/' . argv(1)),
				dbesc(z_root() . '/activity/' . argv(1))
			);
			if($x) {
				foreach($x as $xv) {
					if (intval($xv['item_wall'])) {
						$c = channelx_by_n($xv['uid']);
						if ($c) {
							goaway($c['xchan_url'] . '?mid=' . gen_link_id($xv['mid']));
						}
					}
				}
				goaway($x[0]['llink']);
			}
			http_status_exit(404, 'Not found');
		}

	}



	function post() {

		// This will change. Figure out who the observer is and whether or not
		// they have permission to post here. Else ignore the post.
	
		if((! local_channel()) && (! remote_channel()) && (! x($_REQUEST,'anonname')))
			return;

		$uid = local_channel();
		$channel = null;
		$observer = null;
		$datarray = [];
	
	
		/**
		 * Is this a reply to something?
		 */
	
		$parent = ((x($_REQUEST,'parent')) ? intval($_REQUEST['parent']) : 0);
		$parent_mid = ((x($_REQUEST,'parent_mid')) ? trim($_REQUEST['parent_mid']) : '');
		$mode = (($_REQUEST['conv_mode'] === 'channel') ? 'channel' : 'network');
	
		$remote_xchan = ((x($_REQUEST,'remote_xchan')) ? trim($_REQUEST['remote_xchan']) : false);
		$r = q("select * from xchan where xchan_hash = '%s' limit 1",
			dbesc($remote_xchan)
		);
		if($r)
			$remote_observer = $r[0];
		else 
			$remote_xchan = $remote_observer = false;
	
		$profile_uid = ((x($_REQUEST,'profile_uid')) ? intval($_REQUEST['profile_uid'])    : 0);
		require_once('include/channel.php');

		$sys = get_sys_channel();
		if($sys && $profile_uid && ($sys['channel_id'] == $profile_uid) && is_site_admin()) {
			$uid = intval($sys['channel_id']);
			$channel = $sys;
			$observer = $sys;
		}
	
		if(x($_REQUEST,'dropitems')) {
			require_once('include/items.php');
			$arr_drop = explode(',',$_REQUEST['dropitems']);
			drop_items($arr_drop);
			$json = array('success' => 1);
			echo json_encode($json);
			killme();
		}
	
		call_hooks('post_local_start', $_REQUEST);
	
		// logger('postvars ' . print_r($_REQUEST,true), LOGGER_DATA);
	
		$api_source = ((x($_REQUEST,'api_source') && $_REQUEST['api_source']) ? true : false);
	
		$consensus = intval($_REQUEST['consensus']);
		$nocomment = intval($_REQUEST['nocomment']);

		$is_poll = ((trim($_REQUEST['poll_answers'][0]) != '' && trim($_REQUEST['poll_answers'][1]) != '') ? true : false);

		// 'origin' (if non-zero) indicates that this network is where the message originated,
		// for the purpose of relaying comments to other conversation members. 
		// If using the API from a device (leaf node) you must set origin to 1 (default) or leave unset.
		// If the API is used from another network with its own distribution
		// and deliveries, you may wish to set origin to 0 or false and allow the other 
		// network to relay comments.
	
		// If you are unsure, it is prudent (and important) to leave it unset.   
	
		$origin = (($api_source && array_key_exists('origin',$_REQUEST)) ? intval($_REQUEST['origin']) : 1);
	
		// To represent message-ids on other networks - this will create an iconfig record
	
		$namespace = (($api_source && array_key_exists('namespace',$_REQUEST)) ? strip_tags($_REQUEST['namespace']) : '');
		$remote_id = (($api_source && array_key_exists('remote_id',$_REQUEST)) ? strip_tags($_REQUEST['remote_id']) : '');
	
		$owner_hash = null;
	
		$message_id  = ((x($_REQUEST,'message_id') && $api_source)  ? strip_tags($_REQUEST['message_id'])       : '');
		$created     = ((x($_REQUEST,'created'))     ? datetime_convert(date_default_timezone_get(),'UTC',$_REQUEST['created']) : datetime_convert());
		$post_id     = ((x($_REQUEST,'post_id'))     ? intval($_REQUEST['post_id'])        : 0);
		$app         = ((x($_REQUEST,'source'))      ? strip_tags($_REQUEST['source'])     : '');
		$return_path = ((x($_REQUEST,'return'))      ? $_REQUEST['return']                 : '');
		$preview     = ((x($_REQUEST,'preview'))     ? intval($_REQUEST['preview'])        : 0);
		$categories  = ((x($_REQUEST,'category'))    ? escape_tags($_REQUEST['category'])  : '');
		$webpage     = ((x($_REQUEST,'webpage'))     ? intval($_REQUEST['webpage'])        : 0);
		$item_obscured = ((x($_REQUEST,'obscured'))  ? intval($_REQUEST['obscured'])        : 0);
		$pagetitle   = ((x($_REQUEST,'pagetitle'))   ? escape_tags(urlencode($_REQUEST['pagetitle'])) : '');
		$layout_mid  = ((x($_REQUEST,'layout_mid'))  ? escape_tags($_REQUEST['layout_mid']): '');
		$plink       = ((x($_REQUEST,'permalink'))   ? escape_tags($_REQUEST['permalink']) : '');
		$obj_type    = ((x($_REQUEST,'obj_type'))    ? escape_tags($_REQUEST['obj_type'])  : ACTIVITY_OBJ_NOTE);
	
		// allow API to bulk load a bunch of imported items with sending out a bunch of posts. 
		$nopush      = ((x($_REQUEST,'nopush'))      ? intval($_REQUEST['nopush'])         : 0);
	
		/*
		 * Check service class limits
		 */
		if ($uid && !(x($_REQUEST,'parent')) && !(x($_REQUEST,'post_id'))) {
			$ret = $this->item_check_service_class($uid,(($_REQUEST['webpage'] == ITEM_TYPE_WEBPAGE) ? true : false));
			if (!$ret['success']) { 
				notice( t($ret['message']) . EOL) ;
				if($api_source)
					return ( [ 'success' => false, 'message' => 'service class exception' ] );	
				if(x($_REQUEST,'return')) 
					goaway(z_root() . "/" . $return_path );
				killme();
			}
		}
	
		if($pagetitle) {
			require_once('library/urlify/URLify.php');
			$pagetitle = strtolower(\URLify::transliterate($pagetitle));
		}
	
	
		$item_flags = $item_restrict = 0;
		$expires = NULL_DATE;
	
		$route = '';
		$parent_item = null;
		$parent_contact = null;
		$thr_parent = '';
		$parid = 0;
		$r = false;
	
		if($parent || $parent_mid) {
	
			if(! x($_REQUEST,'type'))
				$_REQUEST['type'] = 'net-comment';
	
			if($obj_type == ACTIVITY_OBJ_NOTE)
				$obj_type = ACTIVITY_OBJ_COMMENT;
	
			if($parent) {
				$r = q("SELECT * FROM item WHERE id = %d LIMIT 1",
					intval($parent)
				);
			}
			elseif($parent_mid && $uid) {
				// This is coming from an API source, and we are logged in
				$r = q("SELECT * FROM item WHERE mid = '%s' AND uid = %d LIMIT 1",
					dbesc($parent_mid),
					intval($uid)
				);
			}
			// if this isn't the real parent of the conversation, find it
			if($r) {
				$parid = $r[0]['parent'];
				$parent_mid = $r[0]['mid'];
				if($r[0]['id'] != $r[0]['parent']) {
					$r = q("SELECT * FROM item WHERE id = parent AND parent = %d LIMIT 1",
						intval($parid)
					);
				}

				// if interacting with a pubstream item, 
				// create a copy of the parent in your stream

				if($r[0]['uid'] === $sys['channel_id'] && local_channel()) {
					$r = [ copy_of_pubitem(\App::get_channel(), $r[0]['mid']) ];
				}
			}

			if(! $r) {
				notice( t('Unable to locate original post.') . EOL);
				if($api_source)
					return ( [ 'success' => false, 'message' => 'invalid post id' ] );	
				if(x($_REQUEST,'return')) 
					goaway(z_root() . "/" . $return_path );
				killme();
			}

			xchan_query($r,true);

			$parent_item = $r[0];
			$parent = $r[0]['id'];

			// multi-level threading - preserve the info but re-parent to our single level threading
	
			$thr_parent = $parent_mid;
	
			$route = $parent_item['route'];
	
		}

		$moderated = false;
	
		if(! $observer) {
			$observer = \App::get_observer();
			if(! $observer) {
				$observer = anon_identity_init($_REQUEST);
				if($observer) {
					$moderated = true;
					$remote_xchan = $remote_observer = $observer;
				}
			}
		} 			
	
		if(! $observer) {
			notice( t('Permission denied.') . EOL) ;
			if($api_source)
				return ( [ 'success' => false, 'message' => 'permission denied' ] );	
			if(x($_REQUEST,'return')) 
				goaway(z_root() . "/" . $return_path );
			killme();
		}

		if($parent) {
			logger('mod_item: item_post parent=' . $parent);
			$can_comment = false;

			$can_comment = can_comment_on_post($observer['xchan_hash'],$parent_item);
                        if (!$can_comment) {
                                if((array_key_exists('owner',$parent_item)) && intval($parent_item['owner']['abook_self'])==1 )
				        $can_comment = perm_is_allowed($profile_uid,$observer['xchan_hash'],'post_comments');
                        }
	
			if(! $can_comment) {
				notice( t('Permission denied.') . EOL) ;
				if($api_source)
					return ( [ 'success' => false, 'message' => 'permission denied' ] );	
				if(x($_REQUEST,'return')) 
					goaway(z_root() . "/" . $return_path );
				killme();
			}
		}
		else {
			if(! perm_is_allowed($profile_uid,$observer['xchan_hash'],($webpage) ? 'write_pages' : 'post_wall')) {
				notice( t('Permission denied.') . EOL) ;
				if($api_source)
					return ( [ 'success' => false, 'message' => 'permission denied' ] );	
				if(x($_REQUEST,'return')) 
					goaway(z_root() . "/" . $return_path );
				killme();
			}
		}
	
	
		// is this an edited post?
	
		$orig_post = null;
	
		if($namespace && $remote_id) {
			// It wasn't an internally generated post - see if we've got an item matching this remote service id
			$i = q("select iid from iconfig where cat = 'system' and k = '%s' and v = '%s' limit 1",
				dbesc($namespace),
				dbesc($remote_id) 
			);
			if($i)
				$post_id = $i[0]['iid'];	
		}
	
		$iconfig = null;
	
		if($post_id) {
			$i = q("SELECT * FROM item WHERE uid = %d AND id = %d LIMIT 1",
				intval($profile_uid),
				intval($post_id)
			);
			if(! count($i))
				killme();
			$orig_post = $i[0];
			$iconfig = q("select * from iconfig where iid = %d",
				intval($post_id)
			);
		}
	
	
		if(! $channel) {
			if($uid && $uid == $profile_uid) {
				$channel = \App::get_channel();
			}
			else {
				// posting as yourself but not necessarily to a channel you control
				$r = q("select * from channel left join account on channel_account_id = account_id where channel_id = %d LIMIT 1",
					intval($profile_uid)
				);
				if($r)
					$channel = $r[0];
			}
		}
	
	
		if(! $channel) {
			logger("mod_item: no channel.");
			if($api_source)
				return ( [ 'success' => false, 'message' => 'no channel' ] );	
			if(x($_REQUEST,'return')) 
				goaway(z_root() . "/" . $return_path );
			killme();
		}
	
		$owner_xchan = null;
	
		$r = q("select * from xchan where xchan_hash = '%s' limit 1",
			dbesc($channel['channel_hash'])
		);
		if($r && count($r)) {
			$owner_xchan = $r[0];
		}
		else {
			logger("mod_item: no owner.");
			if($api_source)
				return ( [ 'success' => false, 'message' => 'no owner' ] );	
			if(x($_REQUEST,'return')) 
				goaway(z_root() . "/" . $return_path );
			killme();
		}
	
		$walltowall = false;
		$walltowall_comment = false;
	
		if($remote_xchan && ! $moderated)
			$observer = $remote_observer;
	
		if($observer) {
			logger('mod_item: post accepted from ' . $observer['xchan_name'] . ' for ' . $owner_xchan['xchan_name'], LOGGER_DEBUG);
	
			// wall-to-wall detection.
			// For top-level posts, if the author and owner are different it's a wall-to-wall
			// For comments, We need to additionally look at the parent and see if it's a wall post that originated locally.
	
			if($observer['xchan_name'] != $owner_xchan['xchan_name'])  {
				if(($parent_item) && ($parent_item['item_wall'] && $parent_item['item_origin'])) {
					$walltowall_comment = true;
					$walltowall = true;
				}
				if(! $parent) {
					$walltowall = true;		
				}
			}
		}
	
		$acl = new \Zotlabs\Access\AccessList($channel);

		$view_policy = \Zotlabs\Access\PermissionLimits::Get($channel['channel_id'],'view_stream');	
		$comment_policy = \Zotlabs\Access\PermissionLimits::Get($channel['channel_id'],'post_comments');
	
		$public_policy = ((x($_REQUEST,'public_policy')) ? escape_tags($_REQUEST['public_policy']) : map_scope($view_policy,true));
		if($webpage)
			$public_policy = '';
		if($public_policy)
			$private = 1;
	
		if($orig_post) {
			$private = 0;
			// webpages are allowed to change ACLs after the fact. Normal conversation items aren't. 
			if($webpage) {
				$acl->set_from_array($_REQUEST);
			}
			else {
				$acl->set($orig_post);
				$public_policy     = $orig_post['public_policy'];
				$private           = $orig_post['item_private'];
			}

			if($public_policy || $acl->is_private()) {
				$private = (($private) ? $private : 1);
			}  
	
			$location          = $orig_post['location'];
			$coord             = $orig_post['coord'];
			$verb              = $orig_post['verb'];
			$app               = $orig_post['app'];
			$title             = escape_tags(trim($_REQUEST['title']));
			$summary           = trim($_REQUEST['summary']);
			$body              = trim($_REQUEST['body']);
			$item_flags        = $orig_post['item_flags'];
	
			$item_origin   = $orig_post['item_origin'];
			$item_unseen   = $orig_post['item_unseen'];
			$item_starred   = $orig_post['item_starred'];
			$item_uplink   = $orig_post['item_uplink'];
			$item_consensus   = $orig_post['item_consensus'];
			$item_wall   = $orig_post['item_wall'];
			$item_thread_top   = $orig_post['item_thread_top'];
			$item_notshown   = $orig_post['item_notshown'];
			$item_nsfw   = $orig_post['item_nsfw'];
			$item_relay   = $orig_post['item_relay'];
			$item_mentionsme   = $orig_post['item_mentionsme'];
			$item_nocomment   = $orig_post['item_nocomment'];
			$item_obscured   = $orig_post['item_obscured'];
			$item_verified   = $orig_post['item_verified'];
			$item_retained   = $orig_post['item_retained'];
			$item_rss   = $orig_post['item_rss'];
			$item_deleted   = $orig_post['item_deleted'];
			$item_type   = $orig_post['item_type'];
			$item_hidden   = $orig_post['item_hidden'];
			$item_unpublished   = $orig_post['item_unpublished'];
			$item_delayed   = $orig_post['item_delayed'];
			$item_pending_remove   = $orig_post['item_pending_remove'];
			$item_blocked   = $orig_post['item_blocked'];
	
	
	
			$postopts          = $orig_post['postopts'];
			$created           = $orig_post['created'];
			$expires           = $orig_post['expires'];
			$mid               = $orig_post['mid'];
			$parent_mid        = $orig_post['parent_mid'];
			$plink             = $orig_post['plink'];
	
		}
		else {
			if(! $walltowall) {
				if((array_key_exists('contact_allow',$_REQUEST))
					|| (array_key_exists('group_allow',$_REQUEST))
					|| (array_key_exists('contact_deny',$_REQUEST))
					|| (array_key_exists('group_deny',$_REQUEST))) {
					$acl->set_from_array($_REQUEST);
				}
				elseif(! $api_source) {
	
					// if no ACL has been defined and we aren't using the API, the form
					// didn't send us any parameters. This means there's no ACL or it has
					// been reset to the default audience.
					// If $api_source is set and there are no ACL parameters, we default
					// to the channel permissions which were set in the ACL contructor.
	
					$acl->set(array('allow_cid' => '', 'allow_gid' => '', 'deny_cid' => '', 'deny_gid' => ''));
				}
			}
	
	
			$location          = notags(trim($_REQUEST['location']));
			$coord             = notags(trim($_REQUEST['coord']));
			$verb              = notags(trim($_REQUEST['verb']));
			$title             = escape_tags(trim($_REQUEST['title']));
			$summary           = trim($_REQUEST['summary']);
			$body              = trim($_REQUEST['body']);
			$body              .= trim($_REQUEST['attachment']);
			$postopts          = '';

			$allow_empty       = ((array_key_exists('allow_empty',$_REQUEST)) ? intval($_REQUEST['allow_empty']) : 0);	

			$private = (($private) ? $private : intval($acl->is_private() || ($public_policy)));
	
			// If this is a comment, set the permissions from the parent.
	
			if($parent_item) {
				$acl->set($parent_item);
				$private = intval($acl->is_private() || $parent_item['item_private']);
				$public_policy     = $parent_item['public_policy'];
				$owner_hash        = $parent_item['owner_xchan'];
				$webpage           = $parent_item['item_type'];
			}
		
			if((! $allow_empty) && (! strlen($body))) {
				if($preview)
					killme();
				info( t('Empty post discarded.') . EOL );
				if($api_source)
					return ( [ 'success' => false, 'message' => 'no content' ] );	
				if(x($_REQUEST,'return')) 
					goaway(z_root() . "/" . $return_path );
				killme();
			}
		}
		
	
	
		if(feature_enabled($profile_uid,'content_expire')) {
			if(x($_REQUEST,'expire')) {
				$expires = datetime_convert(date_default_timezone_get(),'UTC', $_REQUEST['expire']);
				if($expires <= datetime_convert())
					$expires = NULL_DATE;
			}
		}


		$mimetype = notags(trim($_REQUEST['mimetype']));
		if(! $mimetype)
			$mimetype = 'text/bbcode';
	

		$execflag = ((intval($uid) == intval($profile_uid) 
			&& ($channel['channel_pageflags'] & PAGE_ALLOWCODE)) ? true : false);

		if($preview) {
			$summary = z_input_filter($summary,$mimetype,$execflag);
			$body = z_input_filter($body,$mimetype,$execflag);
		}
	

		$arr = [ 'profile_uid' => $profile_uid, 'summary' => $summary, 'content' => $body, 'mimetype' => $mimetype ];
		call_hooks('post_content',$arr);
		$summary = $arr['summary'];
		$body = $arr['content'];
		$mimetype = $arr['mimetype'];

	
		$gacl = $acl->get();
		$str_contact_allow = $gacl['allow_cid'];
		$str_group_allow   = $gacl['allow_gid'];
		$str_contact_deny  = $gacl['deny_cid'];
		$str_group_deny    = $gacl['deny_gid'];


		$groupww = false;

		// if this is a wall-to-wall post to a group, turn it into a direct message
		
		$role = get_pconfig($profile_uid,'system','permissions_role');

		$rolesettings = PermissionRoles::role_perms($role);

		$channel_type = isset($rolesettings['channel_type']) ? $rolesettings['channel_type'] : 'normal';

		$is_group = (($channel_type === 'group') ? true : false);

		if (($is_group) && ($walltowall) && (! $walltowall_comment)) {				
			$groupww = true;
			$str_contact_allow = $owner_xchan['xchan_hash'];
			$str_group_allow = '';
		}

		$post_tags = [];
	
		if($mimetype === 'text/bbcode') {
	
			require_once('include/text.php');			
	
	
			// BBCODE alert: the following functions assume bbcode input
			// and will require alternatives for alternative content-types (text/html, text/markdown, text/plain, etc.)
			// we may need virtual or template classes to implement the possible alternatives

			if(strpos($body,'[/summary]') !== false) {
			    $match = '';
			    $cnt = preg_match("/\[summary\](.*?)\[\/summary\]/ism",$body,$match);
			    if($cnt) {
			        $summary .= $match[1];
			    }
			    $body_content = preg_replace("/\[summary\](.*?)\[\/summary\]/ism", '',$body);
			    $body = trim($body_content);
			}
			
			$summary = cleanup_bbcode($summary);

			$body = cleanup_bbcode($body);
	
			// Look for tags and linkify them

			$results = linkify_tags($summary, ($uid) ? $uid : $profile_uid);
			$results = linkify_tags($body, ($uid) ? $uid : $profile_uid);

			if($results) {
	
				// Set permissions based on tag replacements
				set_linkified_perms($results, $str_contact_allow, $str_group_allow, $profile_uid, $parent_item, $private);
	
				foreach($results as $result) {
					$success = $result['success'];
					if($success['replaced']) {
						$post_tags[] = array(
							'uid'   => $profile_uid, 
							'ttype' => $success['termtype'],
							'otype' => TERM_OBJ_POST,
							'term'  => $success['term'],
							'url'   => $success['url']
						); 				
					}
				}

			}

			if(($str_contact_allow) && (! $str_group_allow)) {
				// direct message - private between individual channels but not groups
				$private = 2;
			}

	
			/**
			 *
			 * When a photo was uploaded into the message using the (profile wall) ajax 
			 * uploader, The permissions are initially set to disallow anybody but the
			 * owner from seeing it. This is because the permissions may not yet have been
			 * set for the post. If it's private, the photo permissions should be set
			 * appropriately. But we didn't know the final permissions on the post until
			 * now. So now we'll look for links of uploaded photos and attachments that are in the
			 * post and set them to the same permissions as the post itself.
			 *
			 * If the post was end-to-end encrypted we can't find images and attachments in the body,
			 * use our media_str input instead which only contains these elements - but only do this
			 * when encrypted content exists because the photo/attachment may have been removed from 
			 * the post and we should keep it private. If it's encrypted we have no way of knowing
			 * so we'll set the permissions regardless and realise that the media may not be 
			 * referenced in the post. 
			 *
			 */
	
			if(! $preview) {
				fix_attached_photo_permissions($profile_uid,$owner_xchan['xchan_hash'],((strpos($body,'[/crypt]')) ? $_POST['media_str'] : $body),$str_contact_allow,$str_group_allow,$str_contact_deny,$str_group_deny);
	
                fix_attached_photo_permissions($profile_uid,$owner_xchan['xchan_hash'],((strpos($summary,'[/crypt]')) ? $_POST['media_str'] : $summary),$str_contact_allow,$str_group_allow,$str_contact_deny,$str_group_deny);


				fix_attached_file_permissions($channel,$observer['xchan_hash'],((strpos($body,'[/crypt]')) ? $_POST['media_str'] : $body),$str_contact_allow,$str_group_allow,$str_contact_deny,$str_group_deny);
	
			}
	
	
			$attachments = '';
			$match = false;
	
			if(preg_match_all('/(\[attachment\](.*?)\[\/attachment\])/',$body,$match)) {
				$attachments = array();
				$i = 0;
				foreach($match[2] as $mtch) {
					$attach_link = '';
					$hash = substr($mtch,0,strpos($mtch,','));
					$rev = intval(substr($mtch,strpos($mtch,',')));
					$r = attach_by_hash_nodata($hash, $observer['xchan_hash'], $rev);
					if($r['success']) {
						$attachments[] = array(
							'href'     => z_root() . '/attach/' . $r['data']['hash'],
							'length'   => $r['data']['filesize'],
							'type'     => $r['data']['filetype'],
							'title'    => urlencode($r['data']['filename']),
							'revision' => $r['data']['revision']
						);
					}
					$body = str_replace($match[1][$i],$attach_link,$body);
					$i++;
				}
			}


			if(preg_match_all('/(\[share=(.*?)\](.*?)\[\/share\])/',$body,$match)) {

				// process share by id				

				$i = 0;
				foreach($match[2] as $mtch) {
					$reshare = new \Zotlabs\Lib\Share($mtch);
					$body = str_replace($match[1][$i],$reshare->bbcode(),$body);
					$i++;
				}
			}
	
		}
	
	// BBCODE end alert
	
		if(strlen($categories)) {

			$cats = explode(',',$categories);
			foreach($cats as $cat) {

				if($webpage == ITEM_TYPE_CARD) {
					$catlink = z_root() . '/cards/' . $channel['channel_address'] . '?f=&cat=' . urlencode(trim($cat));
				}
				elseif($webpage == ITEM_TYPE_ARTICLE) {
					$catlink = z_root() . '/articles/' . $channel['channel_address'] . '?f=&cat=' . urlencode(trim($cat));
				}
				else {
					$catlink = $owner_xchan['xchan_url'] . '?f=&cat=' . urlencode(trim($cat));
				}

				$post_tags[] = array(
					'uid'   => $profile_uid, 
					'ttype' => TERM_CATEGORY,
					'otype' => TERM_OBJ_POST,
					'term'  => trim($cat),
					'url'   => $catlink
				); 				
			}
		}
	
		if($orig_post) {
			// preserve original tags
			$t = q("select * from term where oid = %d and otype = %d and uid = %d and ttype in ( %d, %d, %d )",
				intval($orig_post['id']),
				intval(TERM_OBJ_POST),
				intval($profile_uid),
				intval(TERM_UNKNOWN),
				intval(TERM_FILE),
				intval(TERM_COMMUNITYTAG)
			);
			if($t) {
				foreach($t as $t1) {
					$post_tags[] = array(
						'uid'   => $profile_uid, 
						'ttype' => $t1['ttype'],
						'otype' => TERM_OBJ_POST,
						'term'  => $t1['term'],
						'url'   => $t1['url'],
					); 				
				}
			}
		} 
	
	
		$item_unseen = ((local_channel() != $profile_uid) ? 1 : 0);
		$item_wall = (($post_type === 'wall' || $post_type === 'wall-comment') ? 1 : 0);
		$item_origin = (($origin) ? 1 : 0);
		$item_consensus = (($consensus) ? 1 : 0);
		$item_nocomment = (($nocomment) ? 1 : 0);
	
	
		// determine if this is a wall post
	
		if($parent) {
			$item_wall = $parent_item['item_wall'];
		}
		else {
			if(! $webpage) {
				$item_wall = 1;
			}
		}
	
	
		if($moderated)
			$item_blocked = ITEM_MODERATED;
	
			
		if(! strlen($verb))
			$verb = ACTIVITY_POST ;
	
		$notify_type = (($parent) ? 'comment-new' : 'wall-new' );
	
		if(! $mid) {
			$uuid = (($message_id) ? $message_id : item_message_id());
			$mid = z_root() . '/item/' . $uuid; 
		}


		if($is_poll) {
			$poll = [
				'question' => $body,
				'answers' => $_REQUEST['poll_answers'],
				'multiple_answers' => $_REQUEST['poll_multiple_answers'],
				'expire_value' => $_REQUEST['poll_expire_value'],
				'expire_unit' => $_REQUEST['poll_expire_unit']
			];
			$obj = $this->extract_poll_data($poll, [ 'item_private' => $private, 'allow_cid' => $str_contact_allow, 'allow_gid' => $str_contact_deny ]);
		}
		else {
			$obj = $this->extract_bb_poll_data($body,[ 'item_private' => $private, 'allow_cid' => $str_contact_allow, 'allow_gid' => $str_contact_deny ]);
		}

		if ($obj) {
			$obj['url'] = $mid;
			$obj['attributedTo'] = channel_url($channel);
			$datarray['obj'] = $obj;
			$obj_type = 'Question';
		}

		if(! $parent_mid) {
			$parent_mid = $mid;
		}
	
		if($parent_item)
			$parent_mid = $parent_item['mid'];



		// Fallback so that we alway have a thr_parent
	
		if(!$thr_parent)
			$thr_parent = $mid;
	

		$item_thread_top = ((! $parent) ? 1 : 0);
	

		// fix permalinks for cards
	
		if($webpage == ITEM_TYPE_CARD) {
			$plink = z_root() . '/cards/' . $channel['channel_address'] . '/' . (($pagetitle) ? $pagetitle : $uuid);
		}
		if(($parent_item) && ($parent_item['item_type'] == ITEM_TYPE_CARD)) {
			$r = q("select v from iconfig where iconfig.cat = 'system' and iconfig.k = 'CARD' and iconfig.iid = %d limit 1",
				intval($parent_item['id'])
			);
			if($r) {
				$plink = z_root() . '/cards/' . $channel['channel_address'] . '/' . $r[0]['v'];
			}
		}

		if($webpage == ITEM_TYPE_ARTICLE) {
			$plink = z_root() . '/articles/' . $channel['channel_address'] . '/' . (($pagetitle) ? $pagetitle : $uuid);
		}
		if(($parent_item) && ($parent_item['item_type'] == ITEM_TYPE_ARTICLE)) {
			$r = q("select v from iconfig where iconfig.cat = 'system' and iconfig.k = 'ARTICLE' and iconfig.iid = %d limit 1",
				intval($parent_item['id'])
			);
			if($r) {
				$plink = z_root() . '/articles/' . $channel['channel_address'] . '/' . $r[0]['v'];
			}
		}

		if ((! $plink) && ($item_thread_top)) {
			// $plink = z_root() . '/channel/' . $channel['channel_address'] . '/?f=&mid=' . gen_link_id($mid);
			// $plink = substr($plink,0,190);
			$plink = $mid;
		}

		if ($datarray['obj']) {
			$datarray['obj']['id'] = $mid;
		}

		$datarray['aid']                 = $channel['channel_account_id'];
		$datarray['uid']                 = $profile_uid;
		$datarray['uuid']                = $uuid;
		$datarray['owner_xchan']         = (($owner_hash) ? $owner_hash : $owner_xchan['xchan_hash']);
		$datarray['author_xchan']        = $observer['xchan_hash'];
		$datarray['created']             = $created;
		$datarray['edited']              = (($orig_post) ? datetime_convert() : $created);
		$datarray['expires']             = $expires;
		$datarray['commented']           = (($orig_post) ? datetime_convert() : $created);
		$datarray['received']            = (($orig_post) ? datetime_convert() : $created);
		$datarray['changed']             = (($orig_post) ? datetime_convert() : $created);
		$datarray['mid']                 = $mid;
		$datarray['parent_mid']          = $parent_mid;
		$datarray['mimetype']            = $mimetype;
		$datarray['title']               = $title;
		$datarray['summary']             = $summary;
		$datarray['body']                = $body;
		$datarray['app']                 = $app;
		$datarray['location']            = $location;
		$datarray['coord']               = $coord;
		$datarray['verb']                = $verb;
		$datarray['obj_type']            = $obj_type;
		$datarray['allow_cid']           = $str_contact_allow;
		$datarray['allow_gid']           = $str_group_allow;
		$datarray['deny_cid']            = $str_contact_deny;
		$datarray['deny_gid']            = $str_group_deny;
		$datarray['attach']              = $attachments;
		$datarray['thr_parent']          = $thr_parent;
		$datarray['postopts']            = $postopts;
		$datarray['item_unseen']         = intval($item_unseen);
		$datarray['item_wall']           = intval($item_wall);
		$datarray['item_origin']         = intval($item_origin);
		$datarray['item_type']           = $webpage;
		$datarray['item_private']        = intval($private);
		$datarray['item_thread_top']     = intval($item_thread_top);
		$datarray['item_unseen']         = intval($item_unseen);
		$datarray['item_starred']        = intval($item_starred);
		$datarray['item_uplink']         = intval($item_uplink);
		$datarray['item_consensus']      = intval($item_consensus);
		$datarray['item_notshown']       = intval($item_notshown);
		$datarray['item_nsfw']           = intval($item_nsfw);
		$datarray['item_relay']          = intval($item_relay);
		$datarray['item_mentionsme']     = intval($item_mentionsme);
		$datarray['item_nocomment']      = intval($item_nocomment);
		$datarray['item_obscured']       = intval($item_obscured);
		$datarray['item_verified']       = intval($item_verified);
		$datarray['item_retained']       = intval($item_retained);
		$datarray['item_rss']            = intval($item_rss);
		$datarray['item_deleted']        = intval($item_deleted);
		$datarray['item_hidden']         = intval($item_hidden);
		$datarray['item_unpublished']    = intval($item_unpublished);
		$datarray['item_delayed']        = intval($item_delayed);
		$datarray['item_pending_remove'] = intval($item_pending_remove);
		$datarray['item_blocked']        = intval($item_blocked);	
		$datarray['layout_mid']          = $layout_mid;
		$datarray['public_policy']       = $public_policy;
		$datarray['comment_policy']      = map_scope($comment_policy); 
		$datarray['term']                = array_unique($post_tags, SORT_REGULAR);
		$datarray['plink']               = $plink;
		$datarray['route']               = $route;

		// A specific ACL over-rides public_policy completely
 
		if(! empty_acl($datarray))
			$datarray['public_policy'] = '';

		if($iconfig)
			$datarray['iconfig'] = $iconfig;
	
		// preview mode - prepare the body for display and send it via json
	
		if($preview) {
			require_once('include/conversation.php');
	
			$datarray['owner'] = $owner_xchan;
			$datarray['author'] = $observer;
			$datarray['attach'] = json_encode($datarray['attach']);
			$o = conversation(array($datarray),'search',false,'preview');
	//		logger('preview: ' . $o, LOGGER_DEBUG);
			echo json_encode(array('preview' => $o));
			killme();
		}
		if($orig_post)
			$datarray['edit'] = true;
	
		// suppress duplicates, *unless* you're editing an existing post. This could get picked up
		// as a duplicate if you're editing it very soon after posting it initially and you edited
		// some attribute besides the content, such as title or categories. 

		if(feature_enabled($profile_uid,'suppress_duplicates') && (! $orig_post)) {
	
			$z = q("select created from item where uid = %d and created > %s - INTERVAL %s and body = '%s' limit 1",
				intval($profile_uid),
				db_utcnow(),
				db_quoteinterval('2 MINUTE'),
				dbesc($body)
			);
	
			if($z) {
				$datarray['cancel'] = 1;
				notice( t('Duplicate post suppressed.') . EOL);
				logger('Duplicate post. Faking plugin cancel.');
			}
		}
	
		call_hooks('post_local',$datarray);
	
		if(x($datarray,'cancel')) {
			logger('mod_item: post cancelled by plugin or duplicate suppressed.');
			if($return_path)
				goaway(z_root() . "/" . $return_path);
			if($api_source)
				return ( [ 'success' => false, 'message' => 'operation cancelled' ] );	
			$json = array('cancel' => 1);
			$json['reload'] = z_root() . '/' . $_REQUEST['jsreload'];
			echo json_encode($json);
			killme();
		}
	
	
		if(mb_strlen($datarray['title']) > 191)
			$datarray['title'] = mb_substr($datarray['title'],0,191);
	
		if($webpage) {
			IConfig::Set($datarray,'system', webpage_to_namespace($webpage),
				(($pagetitle) ? $pagetitle : basename($datarray['mid'])), true);
		}
		elseif($namespace) {
			IConfig::Set($datarray,'system', $namespace,
				(($remote_id) ? $remote_id : basename($datarray['mid'])), true);
		}


		if($orig_post) {
			$datarray['id'] = $post_id;
	
			$x = item_store_update($datarray,$execflag);
			
			// We only need edit activities for other federated protocols
			// which do not support edits natively. While this does federate 
			// edits, it presents a number of issues locally - such as #757 and #758.
			// The SQL check for an edit activity would not perform that well so to fix these issues
			// requires an additional item flag (perhaps 'item_edit_activity') that we can add to the 
			// query for searches and notifications.

			// For now we'll just forget about trying to make edits work on network protocols that 
			// don't support them.   

			// item_create_edit_activity($x);			

			if(! $parent) {
				$r = q("select * from item where id = %d",
					intval($post_id)
				);
				if($r) {
					xchan_query($r);
					$sync_item = fetch_post_tags($r);
					Libsync::build_sync_packet($profile_uid,array('item' => array(encode_item($sync_item[0],true))));
				}
			}
			if(! $nopush)
				Master::Summon([ 'Notifier', 'edit_post', $post_id ]);
	

			if($api_source)
				return($x);

			if((x($_REQUEST,'return')) && strlen($return_path)) {
				logger('return: ' . $return_path);
				goaway(z_root() . "/" . $return_path );
			}
			killme();
		}
		else
			$post_id = 0;
	
		$post = item_store($datarray,$execflag);
	
		$post_id = $post['item_id'];

		$datarray = $post['item'];

		if($post_id) {
			logger('mod_item: saved item ' . $post_id);
	
			if($parent) {
	
				// prevent conversations which you are involved from being expired

				if(local_channel())
					retain_item($parent);

				// only send comment notification if this is a wall-to-wall comment,
				// otherwise it will happen during delivery
	
				if(($datarray['owner_xchan'] != $datarray['author_xchan']) && (intval($parent_item['item_wall']))) {
					Enotify::submit(array(
						'type'         => NOTIFY_COMMENT,
						'from_xchan'   => $datarray['author_xchan'],
						'to_xchan'     => $datarray['owner_xchan'],
						'item'         => $datarray,
						'link'		   => z_root() . '/display/' . gen_link_id($datarray['mid']),
						'verb'         => ACTIVITY_POST,
						'otype'        => 'item',
						'parent'       => $parent,
						'parent_mid'   => $parent_item['mid']
					));
				
				}
			}
			else {
				$parent = $post_id;
	
				if(($datarray['owner_xchan'] != $datarray['author_xchan']) && ($datarray['item_type'] == ITEM_TYPE_POST)) {
					Enotify::submit(array(
						'type'         => NOTIFY_WALL,
						'from_xchan'   => $datarray['author_xchan'],
						'to_xchan'     => $datarray['owner_xchan'],
						'item'         => $datarray,
						'link'		   => z_root() . '/display/' . gen_link_id($datarray['mid']),
						'verb'         => ACTIVITY_POST,
						'otype'        => 'item'
					));
				}
	
				if($uid && $uid == $profile_uid && (is_item_normal($datarray))) {
					q("update channel set channel_lastpost = '%s' where channel_id = %d",
						dbesc(datetime_convert()),
						intval($uid)
					);
				}
			}
	
			// photo comments turn the corresponding item visible to the profile wall
			// This way we don't see every picture in your new photo album posted to your wall at once.
			// They will show up as people comment on them.
	
			if(intval($parent_item['item_hidden'])) {
				$r = q("UPDATE item SET item_hidden = 0 WHERE id = %d",
					intval($parent_item['id'])
				);
			}
		}
		else {
			logger('mod_item: unable to retrieve post that was just stored.');
			notice( t('System error. Post not saved.') . EOL);
			if($return_path)
				goaway(z_root() . "/" . $return_path );
			if($api_source)
				return ( [ 'success' => false, 'message' => 'system error' ] );
			killme();
		}
		
		if(($parent == $post_id) || ($datarray['item_private'] == 1)) {
			$r = q("select * from item where id = %d",
				intval($post_id)
			);
			if($r) {
				xchan_query($r);
				$sync_item = fetch_post_tags($r);
				Libsync::build_sync_packet($profile_uid,array('item' => array(encode_item($sync_item[0],true))));
			}
		}
	
		$datarray['id']    = $post_id;
		$datarray['llink'] = z_root() . '/display/' . gen_link_id($datarray['mid']);
	
		call_hooks('post_local_end', $datarray);

		if ($groupww) {
			$nopush = false;
		}

		if(! $nopush)
			Master::Summon([ 'Notifier', $notify_type, $post_id ]);
	
		logger('post_complete');

		if($moderated) {
			info(t('Your comment is awaiting approval.') . EOL);
		}
	
		// figure out how to return, depending on from whence we came
	
		if($api_source)
			return $post;
	
		if($return_path) {
			goaway(z_root() . "/" . $return_path);
		}

		if($mode === 'channel')
			profile_load($owner_xchan['xchan_name']);

		$item[] = $datarray;
		$item[0]['owner'] = $owner_xchan;
		$item[0]['author'] = $observer;
		$item[0]['attach'] = json_encode($datarray['attach']);

		$json = [
			'success' => 1,
			'id' => $post_id,
			'html' => conversation($item,$mode,true,'r_preview'),
		];

		if(x($_REQUEST,'jsreload') && strlen($_REQUEST['jsreload']))
			$json['reload'] = z_root() . '/' . $_REQUEST['jsreload'];
	
		logger('post_json: ' . print_r($json,true), LOGGER_DEBUG);
	
		echo json_encode($json);
		killme();
		// NOTREACHED
	}
	
	
	function get() {
	
		if((! local_channel()) && (! remote_channel()))
			return;
		
		if((argc() == 3) && (argv(1) === 'drop') && intval(argv(2))) {
	
			require_once('include/items.php');


			$i = q("select id, uid, item_origin, author_xchan, owner_xchan, source_xchan, item_type from item where id = %d limit 1",
				intval(argv(2))
			);
	
			if($i) {
				$can_delete = false;
				$local_delete = false;

				if(local_channel() && local_channel() == $i[0]['uid']) {
					$local_delete = true;
				}
	
				$ob_hash = get_observer_hash();
				if($ob_hash && ($ob_hash === $i[0]['author_xchan'] || $ob_hash === $i[0]['owner_xchan'] || $ob_hash === $i[0]['source_xchan'])) {
					$can_delete = true;
				}

				// The site admin can delete any post/item on the site.
				// If the item originated on this site+channel the deletion will propagate downstream. 
				// Otherwise just the local copy is removed.

				if(is_site_admin()) {
					$local_delete = true;
					if(intval($i[0]['item_origin']))
						$can_delete = true;
				}


				if(! ($can_delete || $local_delete)) {
					notice( t('Permission denied.') . EOL);
					return;
				}
	
				// if this is a different page type or it's just a local delete
				// but not by the item author or owner, do a simple deletion

				$complex = false;	

				if(intval($i[0]['item_type']) || ($local_delete && (! $can_delete))) {
					drop_item($i[0]['id']);
				}
				else {
					// complex deletion that needs to propagate and be performed in phases
					drop_item($i[0]['id'],true,DROPITEM_PHASE1);
					$complex = true;
				}

				$r = q("select * from item where id = %d",
					intval($i[0]['id'])
				);
				if($r) {
					xchan_query($r);
					$sync_item = fetch_post_tags($r);
					Libsync::build_sync_packet($i[0]['uid'],array('item' => array(encode_item($sync_item[0],true))));
				}

				if($complex) {
					tag_deliver($i[0]['uid'],$i[0]['id']);
				}
			}
		}
	}
	
	
	
	function item_check_service_class($channel_id,$iswebpage) {
		$ret = array('success' => false, 'message' => '');
	
		if ($iswebpage) {
			$r = q("select count(i.id)  as total from item i 
				right join channel c on (i.author_xchan=c.channel_hash and i.uid=c.channel_id )  
				and i.parent=i.id and i.item_type = %d and i.item_deleted = 0 and i.uid= %d ",
				intval(ITEM_TYPE_WEBPAGE),
				intval($channel_id)
			);
		}
		else {
			$r = q("select count(id) as total from item where parent = id and item_wall = 1 and uid = %d " . item_normal(),
				intval($channel_id)
			);
		}
	
		if(! $r) {
			$ret['message'] = t('Unable to obtain post information from database.');
			return $ret;
		} 

		if (!$iswebpage) {
			$max = engr_units_to_bytes(service_class_fetch($channel_id,'total_items'));
			if(! service_class_allows($channel_id,'total_items',$r[0]['total'])) {
				$result['message'] .= upgrade_message() . sprintf( t('You have reached your limit of %1$.0f top level posts.'),$max);
				return $result;
			}
		}
		else {
			$max = engr_units_to_bytes(service_class_fetch($channel_id,'total_pages'));
			if(! service_class_allows($channel_id,'total_pages',$r[0]['total'])) {
				$result['message'] .= upgrade_message() . sprintf( t('You have reached your limit of %1$.0f webpages.'),$max);
				return $result;
			}	
		}
	
		$ret['success'] = true;
		return $ret;
	}
	
	function extract_bb_poll_data(&$body,$item) {

		$multiple = false;

		if (strpos($body,'[/question]') === false && strpos($body,'[/answer]') === false) {
			return false;
		}
		if (strpos($body,'[nobb]') !== false) {
			return false;
		}


		$obj = [];
		$ptr = [];
		$matches = null;
		$obj['type'] = 'Question';

		if (preg_match_all('/\[answer\](.*?)\[\/answer\]/ism',$body,$matches,PREG_SET_ORDER)) {
			foreach ($matches as $match) {
				$ptr[] = [ 'name' => $match[1], 'type' => 'Note', 'replies' => [ 'type' => 'Collection', 'totalItems' => 0 ]];
				$body = str_replace('[answer]' . $match[1] . '[/answer]', EMPTY_STR, $body);
			}
		}

		$matches = null;

		if (preg_match('/\[question\](.*?)\[\/question\]/ism',$body,$matches)) {
			$obj['content'] = bbcode($matches[1]);
			$body = str_replace('[question]' . $matches[1] . '[/question]', $matches[1], $body);
			$obj['oneOf'] = $ptr;
		}

		$matches = null;
		
		if (preg_match('/\[question=multiple\](.*?)\[\/question\]/ism',$body,$matches)) {
			$obj['content'] = bbcode($matches[1]);
			$body = str_replace('[question=multiple]' . $matches[1] . '[/question]', $matches[1], $body);
			$obj['anyOf'] = $ptr;
		}

		$matches = null;
		
		if (preg_match('/\[ends\](.*?)\[\/ends\]/ism',$body,$matches)) {
			$obj['endTime'] = datetime_convert(date_default_timezone_get(),'UTC', $matches[1],ATOM_TIME);
			$body = str_replace('[ends]' . $matches[1] . '[/ends]', EMPTY_STR, $body);
		}


		if ($item['item_private']) {
			$obj['to'] = Activity::map_acl($item);
		}
		else {
			$obj['to'] = [ ACTIVITY_PUBLIC_INBOX ];
		}

		return $obj;

	}


	function extract_poll_data($poll, $item) {

		$multiple = intval($poll['multiple_answers']);
		$expire_value = intval($poll['expire_value']);
		$expire_unit = $poll['expire_unit'];
		$question = $poll['question'];
		$answers = $poll['answers'];

		$obj = [];
		$ptr = [];
		$obj['type'] = 'Question';
		$obj['content'] = bbcode($question);

		foreach($answers as $answer) {
			if(trim($answer))
				$ptr[] = [ 'name' => escape_tags($answer), 'type' => 'Note', 'replies' => [ 'type' => 'Collection', 'totalItems' => 0 ]];
		}

		if($multiple) {
			$obj['anyOf'] = $ptr;
		}
		else {
			$obj['oneOf'] = $ptr;
		}

		$obj['endTime'] = datetime_convert(date_default_timezone_get(), 'UTC', 'now + ' . $expire_value . ' ' . $expire_unit, ATOM_TIME);

		if ($item['item_private']) {
			$obj['to'] = Activity::map_acl($item);
		}
		else {
			$obj['to'] = [ ACTIVITY_PUBLIC_INBOX ];
		}

		return $obj;

	}



}