From 166879b8b04f8656a0ef105c319b8b4a82626bd9 Mon Sep 17 00:00:00 2001
From: zotlabs <mike@macgirvin.com>
Date: Mon, 6 Aug 2018 17:43:22 -0700
Subject: bring some Zot6 libraries and interfaces to red/hubzilla

---
 Zotlabs/Lib/Activity.php | 1725 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 1725 insertions(+)
 create mode 100644 Zotlabs/Lib/Activity.php

(limited to 'Zotlabs/Lib/Activity.php')

diff --git a/Zotlabs/Lib/Activity.php b/Zotlabs/Lib/Activity.php
new file mode 100644
index 000000000..6ddbbb9db
--- /dev/null
+++ b/Zotlabs/Lib/Activity.php
@@ -0,0 +1,1725 @@
+<?php
+
+namespace Zotlabs\Lib;
+
+use Zotlabs\Lib\Libzot;
+use Zotlabs\Lib\Libsync;
+use Zotlabs\Lib\ActivityStreams;
+use Zotlabs\Lib\Group;
+
+class Activity {
+
+	static function encode_object($x) {
+
+		if(($x) && (! is_array($x)) && (substr(trim($x),0,1)) === '{' ) {
+			$x = json_decode($x,true);
+		}
+		if($x['type'] === ACTIVITY_OBJ_PERSON) {
+			return self::fetch_person($x); 
+		}
+		if($x['type'] === ACTIVITY_OBJ_PROFILE) {
+			return self::fetch_profile($x); 
+		}
+		if(in_array($x['type'], [ ACTIVITY_OBJ_NOTE, ACTIVITY_OBJ_ARTICLE ] )) {
+			return self::fetch_item($x); 
+		}
+		if($x['type'] === ACTIVITY_OBJ_THING) {
+			return self::fetch_thing($x); 
+		}
+
+		return $x;
+
+	}
+
+
+	static function fetch_person($x) {
+		return self::fetch_profile($x);
+	}
+
+	static function fetch_profile($x) {
+		$r = q("select * from xchan where xchan_url like '%s' limit 1",
+			dbesc($x['id'] . '/%')
+		);
+		if(! $r) {
+			$r = q("select * from xchan where xchan_hash = '%s' limit 1",
+				dbesc($x['id'])
+			);
+
+		} 
+		if(! $r)
+			return [];
+
+		return self::encode_person($r[0]);
+
+	}
+
+	static function fetch_thing($x) {
+
+		$r = q("select * from obj where obj_type = %d and obj_obj = '%s' limit 1",
+			intval(TERM_OBJ_THING),
+			dbesc($x['id'])
+		);
+
+		if(! $r)
+			return [];
+
+		$x = [
+			'type' => 'Object',
+			'id'   => z_root() . '/thing/' . $r[0]['obj_obj'],
+			'name' => $r[0]['obj_term']
+		];
+
+		if($r[0]['obj_image'])
+			$x['image'] = $r[0]['obj_image'];
+
+		return $x;
+
+	}
+
+	static function fetch_item($x) {
+
+		if (array_key_exists('source',$x)) {
+			// This item is already processed and encoded
+			return $x;
+		}
+
+		$r = q("select * from item where mid = '%s' limit 1",
+			dbesc($x['id'])
+		);
+		if($r) {
+			xchan_query($r,true);
+			$r = fetch_post_tags($r,true);
+			return self::encode_item($r[0]);
+		}
+	}
+
+	static function encode_item_collection($items,$id,$type,$extra = null) {
+
+		$ret = [
+			'id' => z_root() . '/' . $id,
+			'type' => $type,
+			'totalItems' => count($items),
+		];
+		if($extra)
+			$ret = array_merge($ret,$extra);
+
+		if($items) {
+			$x = [];
+			foreach($items as $i) {
+				$t = self::encode_activity($i);
+				if($t)
+					$x[] = $t;
+			}
+			if($type === 'OrderedCollection')
+				$ret['orderedItems'] = $x;
+			else
+				$ret['items'] = $x;
+		}
+
+		return $ret;
+	}
+
+	static function encode_follow_collection($items,$id,$type,$extra = null) {
+
+		$ret = [
+			'id' => z_root() . '/' . $id,
+			'type' => $type,
+			'totalItems' => count($items),
+		];
+		if($extra)
+			$ret = array_merge($ret,$extra);
+
+		if($items) {
+			$x = [];
+			foreach($items as $i) {
+				if($i['xchan_url']) {
+					$x[] = $i['xchan_url'];
+				}
+			}
+
+			if($type === 'OrderedCollection')
+				$ret['orderedItems'] = $x;
+			else
+				$ret['items'] = $x;
+		}
+
+		return $ret;
+	}
+
+
+
+
+	static function encode_item($i) {
+
+		$ret = [];
+
+		$objtype = self::activity_obj_mapper($i['obj_type']);
+
+		if(intval($i['item_deleted'])) {
+			$ret['type'] = 'Tombstone';
+			$ret['formerType'] = $objtype;
+			$ret['id'] = ((strpos($i['mid'],'http') === 0) ? $i['mid'] : z_root() . '/item/' . urlencode($i['mid']));
+			return $ret;
+		}
+
+		$ret['type'] = $objtype;
+
+		$ret['id']   = ((strpos($i['mid'],'http') === 0) ? $i['mid'] : z_root() . '/item/' . urlencode($i['mid']));
+
+		if($i['title'])
+			$ret['title'] = bbcode($i['title']);
+
+		$ret['published'] = datetime_convert('UTC','UTC',$i['created'],ATOM_TIME);
+		if($i['created'] !== $i['edited'])
+			$ret['updated'] = datetime_convert('UTC','UTC',$i['edited'],ATOM_TIME);
+		if($i['app']) {
+			$ret['instrument'] = [ 'type' => 'Service', 'name' => $i['app'] ];
+		}
+		if($i['location'] || $i['coord']) {
+			$ret['location'] = [ 'type' => 'Place' ];
+			if($i['location']) {
+				$ret['location']['name'] = $i['location'];
+			}
+			if($i['coord']) {
+				$l = explode(' ',$i['coord']);
+				$ret['location']['latitude'] = $l[0];
+				$ret['location']['longitude'] = $l[1];
+			}
+		}
+
+		$ret['attributedTo'] = $i['author']['xchan_url'];
+
+		if($i['id'] != $i['parent']) {
+			$ret['inReplyTo'] = ((strpos($i['parent_mid'],'http') === 0) ? $i['parent_mid'] : z_root() . '/item/' . urlencode($i['parent_mid']));
+		}
+
+		if($i['mimetype'] === 'text/bbcode') {
+			if($i['title'])
+				$ret['name'] = bbcode($i['title']);
+			if($i['summary'])
+				$ret['summary'] = bbcode($i['summary']);
+			$ret['content'] = bbcode($i['body']);
+			$ret['source'] = [ 'content' => $i['body'], 'mediaType' => 'text/bbcode' ];
+		}
+
+		$actor = self::encode_person($i['author'],false);
+		if($actor)
+			$ret['actor'] = $actor;
+		else
+			return [];
+
+		$t = self::encode_taxonomy($i);
+		if($t) {
+			$ret['tag']       = $t;
+		}
+
+		$a = self::encode_attachment($i);
+		if($a) {
+			$ret['attachment'] = $a;
+		}
+
+		return $ret;
+	}
+
+	static function decode_taxonomy($item) {
+
+		$ret = [];
+
+		if($item['tag']) {
+			foreach($item['tag'] as $t) {
+				if(! array_key_exists('type',$t))
+					$t['type'] = 'Hashtag';
+
+				switch($t['type']) {
+					case 'Hashtag':
+						$ret[] = [ 'ttype' => TERM_HASHTAG, 'url' => $t['href'], 'term' => escape_tags((substr($t['name'],0,1) === '#') ? substr($t['name'],1) : $t['name']) ];
+						break;
+
+					case 'Mention':
+						$mention_type = substr($t['name'],0,1);
+						if($mention_type === '!') {
+							$ret[] = [ 'ttype' => TERM_FORUM, 'url' => $t['href'], 'term' => escape_tags(substr($t['name'],1)) ];
+						}
+						else {
+							$ret[] = [ 'ttype' => TERM_MENTION, 'url' => $t['href'], 'term' => escape_tags((substr($t['name'],0,1) === '@') ? substr($t['name'],1) : $t['name']) ];
+						}
+						break;
+	
+					default:
+						break;
+				}
+			}
+		}
+
+		return $ret;
+	}
+
+
+	static function encode_taxonomy($item) {
+
+		$ret = [];
+
+		if($item['term']) {
+			foreach($item['term'] as $t) {
+				switch($t['ttype']) {
+					case TERM_HASHTAG:
+						// An id is required so if we don't have a url in the taxonomy, ignore it and keep going.
+						if($t['url']) {
+							$ret[] = [ 'id' => $t['url'], 'name' => '#' . $t['term'] ];
+						}
+						break;
+
+					case TERM_FORUM:
+						$ret[] = [ 'type' => 'Mention', 'href' => $t['url'], 'name' => '!' . $t['term'] ];
+						break;
+
+					case TERM_MENTION:
+						$ret[] = [ 'type' => 'Mention', 'href' => $t['url'], 'name' => '@' . $t['term'] ];
+						break;
+	
+					default:
+						break;
+				}
+			}
+		}
+
+		return $ret;
+	}
+
+	static function encode_attachment($item) {
+
+		$ret = [];
+
+		if($item['attach']) {
+			$atts = json_decode($item['attach'],true);
+			if($atts) {
+				foreach($atts as $att) {
+					if(strpos($att['type'],'image')) {
+						$ret[] = [ 'type' => 'Image', 'url' => $att['href'] ];
+					}
+					else {
+						$ret[] = [ 'type' => 'Link', 'mediaType' => $att['type'], 'href' => $att['href'] ];
+					}
+				}
+			}
+		}
+
+		return $ret;
+	}
+
+
+	static function decode_attachment($item) {
+
+		$ret = [];
+
+		if($item['attachment']) {
+			foreach($item['attachment'] as $att) {
+				$entry = [];
+				if($att['href'])
+					$entry['href'] = $att['href'];
+				elseif($att['url'])
+					$entry['href'] = $att['url'];
+				if($att['mediaType'])
+					$entry['type'] = $att['mediaType'];
+				elseif($att['type'] === 'Image')
+					$entry['type'] = 'image/jpeg';
+				if($entry)
+					$ret[] = $entry;
+			}
+		}
+
+		return $ret;
+	}
+
+
+
+	static function encode_activity($i) {
+
+		$ret   = [];
+		$reply = false;
+
+		if(intval($i['item_deleted'])) {
+			$ret['type'] = 'Tombstone';
+			$ret['formerType'] = self::activity_obj_mapper($i['obj_type']);
+			$ret['id'] = ((strpos($i['mid'],'http') === 0) ? $i['mid'] : z_root() . '/item/' . urlencode($i['mid']));
+			return $ret;
+		}
+
+		$ret['type'] = self::activity_mapper($i['verb']);
+		$ret['id']   = ((strpos($i['mid'],'http') === 0) ? $i['mid'] : z_root() . '/activity/' . urlencode($i['mid']));
+
+		if($i['title'])
+			$ret['name'] = html2plain(bbcode($i['title']));
+
+		if($i['summary'])
+			$ret['summary'] = bbcode($i['summary']);
+
+		if($ret['type'] === 'Announce') {
+			$tmp = preg_replace('/\[share(.*?)\[\/share\]/ism',EMPTY_STR, $i['body']);
+			$ret['content'] = bbcode($tmp);
+			$ret['source'] = [
+				'content' => $i['body'],
+				'mediaType' => 'text/bbcode'
+			];
+		}
+
+		$ret['published'] = datetime_convert('UTC','UTC',$i['created'],ATOM_TIME);
+		if($i['created'] !== $i['edited'])
+			$ret['updated'] = datetime_convert('UTC','UTC',$i['edited'],ATOM_TIME);
+		if($i['app']) {
+			$ret['instrument'] = [ 'type' => 'Service', 'name' => $i['app'] ];
+		}
+		if($i['location'] || $i['coord']) {
+			$ret['location'] = [ 'type' => 'Place' ];
+			if($i['location']) {
+				$ret['location']['name'] = $i['location'];
+			}
+			if($i['coord']) {
+				$l = explode(' ',$i['coord']);
+				$ret['location']['latitude'] = $l[0];
+				$ret['location']['longitude'] = $l[1];
+			}
+		}
+
+		if($i['id'] != $i['parent']) {
+			$ret['inReplyTo'] = ((strpos($i['parent_mid'],'http') === 0) ? $i['parent_mid'] : z_root() . '/item/' . urlencode($i['parent_mid']));
+			$reply = true;
+
+			if($i['item_private']) {
+				$d = q("select xchan_url, xchan_addr, xchan_name from item left join xchan on xchan_hash = author_xchan where id = %d limit 1",
+					intval($i['parent'])
+				);
+				if($d) {
+					$is_directmessage = false;
+					$recips = get_iconfig($i['parent'], 'activitypub', 'recips');
+
+					if(in_array($i['author']['xchan_url'], $recips['to'])) {
+						$reply_url = $d[0]['xchan_url'];
+						$is_directmessage = true;
+					}
+					else {
+						$reply_url = z_root() . '/followers/' . substr($i['author']['xchan_addr'],0,strpos($i['author']['xchan_addr'],'@'));
+					}
+
+					$reply_addr = (($d[0]['xchan_addr']) ? $d[0]['xchan_addr'] : $d[0]['xchan_name']);
+				}
+			}
+
+		}
+
+		$actor = self::encode_person($i['author'],false);
+		if($actor)
+			$ret['actor'] = $actor;
+		else
+			return []; 
+
+		if($i['obj']) {
+			if(! is_array($i['obj'])) {
+				$i['obj'] = json_decode($i['obj'],true);
+			}
+			$obj = self::encode_object($i['obj']);
+			if($obj)
+				$ret['object'] = $obj;
+			else
+				return [];
+		}
+		else {
+			$obj = self::encode_item($i);
+			if($obj)
+				$ret['object'] = $obj;
+			else
+				return [];
+		}
+
+		if($i['target']) {
+			if(! is_array($i['target'])) {
+				$i['target'] = json_decode($i['target'],true);
+			}
+			$tgt = self::encode_object($i['target']);
+			if($tgt)
+				$ret['target'] = $tgt;
+			else
+				return [];
+		}
+
+		return $ret;
+	}
+
+	static function map_mentions($i) {
+		if(! $i['term']) {
+			return [];
+		}
+
+		$list = [];
+
+		foreach ($i['term'] as $t) {
+			if($t['ttype'] == TERM_MENTION) {
+				$list[] = $t['url'];
+			}
+		}
+
+		return $list;
+	}
+
+	static function map_acl($i,$mentions = false) {
+
+		$private = false;
+		$list = [];
+		$x = collect_recipients($i,$private);
+		if($x) {
+			stringify_array_elms($x);
+			if(! $x)
+				return;
+
+			$strict = (($mentions) ? true : get_config('activitypub','compliance'));
+
+			$sql_extra = (($strict) ? " and xchan_network = 'activitypub' " : '');
+
+			$details = q("select xchan_url, xchan_addr, xchan_name from xchan where xchan_hash in (" . implode(',',$x) . ") $sql_extra");
+
+			if($details) {
+				foreach($details as $d) {
+					if($mentions) {
+						$list[] = [ 'type' => 'Mention', 'href' => $d['xchan_url'], 'name' => '@' . (($d['xchan_addr']) ? $d['xchan_addr'] : $d['xchan_name']) ];
+					}
+					else { 
+						$list[] = $d['xchan_url'];
+					}
+				}
+			}
+		}
+
+		return $list;
+
+	}
+
+
+	static function encode_person($p, $extended = true) {
+
+		if(! $p['xchan_url'])
+			return [];
+
+		if(! $extended) {
+			return $p['xchan_url'];
+		}
+		$ret = [];
+
+		$ret['type']  = 'Person';
+		$ret['id']    = $p['xchan_url'];
+		if($p['xchan_addr'] && strpos($p['xchan_addr'],'@'))
+			$ret['preferredUsername'] = substr($p['xchan_addr'],0,strpos($p['xchan_addr'],'@'));
+		$ret['name']  = $p['xchan_name'];
+		$ret['updated'] = datetime_convert('UTC','UTC',$p['xchan_name_date'],ATOM_TIME);
+		$ret['icon']  = [
+			'type'      => 'Image',
+			'mediaType' => (($p['xchan_photo_mimetype']) ? $p['xchan_photo_mimetype'] : 'image/png' ),
+			'updated'   => datetime_convert('UTC','UTC',$p['xchan_photo_date'],ATOM_TIME),
+			'url'       => $p['xchan_photo_l'],
+			'height'    => 300,
+			'width'     => 300,
+		];
+		$ret['url'] = [
+			[ 
+				'type'      => 'Link',
+				'mediaType' => 'text/html',
+				'href'      => $p['xchan_url']
+			],
+			[
+				'type'      => 'Link',
+				'mediaType' => 'text/x-zot+json',
+				'href'      => $p['xchan_url']
+			]
+		];
+
+		$arr = [ 'xchan' => $p, 'encoded' => $ret ];
+		call_hooks('encode_person', $arr);
+		$ret = $arr['encoded'];
+
+
+		return $ret;
+	}
+
+
+	static function activity_mapper($verb) {
+
+		if(strpos($verb,'/') === false) {
+			return $verb;
+		}
+
+		$acts = [
+			'http://activitystrea.ms/schema/1.0/post'      => 'Create',
+			'http://activitystrea.ms/schema/1.0/share'     => 'Announce',
+			'http://activitystrea.ms/schema/1.0/update'    => 'Update',
+			'http://activitystrea.ms/schema/1.0/like'      => 'Like',
+			'http://activitystrea.ms/schema/1.0/favorite'  => 'Like',
+			'http://purl.org/zot/activity/dislike'         => 'Dislike',
+			'http://activitystrea.ms/schema/1.0/tag'       => 'Add',
+			'http://activitystrea.ms/schema/1.0/follow'    => 'Follow',
+			'http://activitystrea.ms/schema/1.0/unfollow'  => 'Unfollow',
+		];
+
+
+		if(array_key_exists($verb,$acts) && $acts[$verb]) {
+			return $acts[$verb];
+		}
+
+		// Reactions will just map to normal activities
+
+		if(strpos($verb,ACTIVITY_REACT) !== false)
+			return 'Create';
+		if(strpos($verb,ACTIVITY_MOOD) !== false)
+			return 'Create';
+
+		if(strpos($verb,ACTIVITY_POKE) !== false)
+			return 'Activity';
+
+		// We should return false, however this will trigger an uncaught execption  and crash 
+		// the delivery system if encountered by the JSON-LDSignature library
+ 
+		logger('Unmapped activity: ' . $verb);
+		return 'Create';
+	//	return false;
+}
+
+
+	static function activity_obj_mapper($obj) {
+
+		if(strpos($obj,'/') === false) {
+			return $obj;
+		}
+
+		$objs = [
+			'http://activitystrea.ms/schema/1.0/note'           => 'Note',
+			'http://activitystrea.ms/schema/1.0/comment'        => 'Note',
+			'http://activitystrea.ms/schema/1.0/person'         => 'Person',
+			'http://purl.org/zot/activity/profile'              => 'Profile',
+			'http://activitystrea.ms/schema/1.0/photo'          => 'Image',
+			'http://activitystrea.ms/schema/1.0/profile-photo'  => 'Icon',
+			'http://activitystrea.ms/schema/1.0/event'          => 'Event',
+			'http://activitystrea.ms/schema/1.0/wiki'           => 'Document',
+			'http://purl.org/zot/activity/location'             => 'Place',
+			'http://purl.org/zot/activity/chessgame'            => 'Game',
+			'http://purl.org/zot/activity/tagterm'              => 'zot:Tag',
+			'http://purl.org/zot/activity/thing'                => 'Object',
+			'http://purl.org/zot/activity/file'                 => 'zot:File',
+			'http://purl.org/zot/activity/mood'                 => 'zot:Mood',
+		
+		];
+
+		if(array_key_exists($obj,$objs)) {
+			return $objs[$obj];
+		}
+
+		logger('Unmapped activity object: ' . $obj);
+		return 'Note';
+
+		//	return false;
+
+	}
+
+
+	static function follow($channel,$act) {
+
+		$contact = null;
+		$their_follow_id = null;
+
+		/*
+		 * 
+		 * if $act->type === 'Follow', actor is now following $channel 
+		 * if $act->type === 'Accept', actor has approved a follow request from $channel 
+		 *	 
+		 */
+
+		$person_obj = $act->actor;
+
+		if($act->type === 'Follow') {
+			$their_follow_id  = $act->id;
+		}
+		elseif($act->type === 'Accept') {
+			$my_follow_id = z_root() . '/follow/' . $contact['id'];
+		}
+	
+		if(is_array($person_obj)) {
+
+			// store their xchan and hubloc
+
+			self::actor_store($person_obj['id'],$person_obj);
+
+			// Find any existing abook record 
+
+			$r = q("select * from abook left join xchan on abook_xchan = xchan_hash where abook_xchan = '%s' and abook_channel = %d limit 1",
+				dbesc($person_obj['id']),
+				intval($channel['channel_id'])
+			);
+			if($r) {
+				$contact = $r[0];
+			}
+		}
+
+		$x = \Zotlabs\Access\PermissionRoles::role_perms('social');
+		$p = \Zotlabs\Access\Permissions::FilledPerms($x['perms_connect']);
+		$their_perms = \Zotlabs\Access\Permissions::serialise($p);
+
+		if($contact && $contact['abook_id']) {
+
+			// A relationship of some form already exists on this site. 
+
+			switch($act->type) {
+
+				case 'Follow':
+
+					// A second Follow request, but we haven't approved the first one
+
+					if($contact['abook_pending']) {
+						return;
+					}
+
+					// We've already approved them or followed them first
+					// Send an Accept back to them
+
+					set_abconfig($channel['channel_id'],$person_obj['id'],'pubcrawl','their_follow_id', $their_follow_id);
+					\Zotlabs\Daemon\Master::Summon([ 'Notifier', 'permissions_accept', $contact['abook_id'] ]);
+					return;
+
+				case 'Accept':
+
+					// They accepted our Follow request - set default permissions
+	
+					set_abconfig($channel['channel_id'],$contact['abook_xchan'],'system','their_perms',$their_perms);
+
+					$abook_instance = $contact['abook_instance'];
+	
+					if(strpos($abook_instance,z_root()) === false) {
+						if($abook_instance) 
+							$abook_instance .= ',';
+						$abook_instance .= z_root();
+
+						$r = q("update abook set abook_instance = '%s', abook_not_here = 0 
+							where abook_id = %d and abook_channel = %d",
+							dbesc($abook_instance),
+							intval($contact['abook_id']),
+							intval($channel['channel_id'])
+						);
+					}
+		
+					return;
+				default:
+					return;
+	
+			}
+		}
+
+		// No previous relationship exists.
+
+		if($act->type === 'Accept') {
+			// This should not happen unless we deleted the connection before it was accepted.
+			return;
+		}
+
+		// From here on out we assume a Follow activity to somebody we have no existing relationship with
+
+		set_abconfig($channel['channel_id'],$person_obj['id'],'pubcrawl','their_follow_id', $their_follow_id);
+
+		// The xchan should have been created by actor_store() above
+
+		$r = q("select * from xchan where xchan_hash = '%s' and xchan_network = 'activitypub' limit 1",
+			dbesc($person_obj['id'])
+		);
+
+		if(! $r) {
+			logger('xchan not found for ' . $person_obj['id']);
+			return;
+		}
+		$ret = $r[0];
+
+		$p = \Zotlabs\Access\Permissions::connect_perms($channel['channel_id']);
+		$my_perms  = \Zotlabs\Access\Permissions::serialise($p['perms']);
+		$automatic = $p['automatic'];
+
+		$closeness = get_pconfig($channel['channel_id'],'system','new_abook_closeness',80);
+
+		$r = abook_store_lowlevel(
+			[
+				'abook_account'   => intval($channel['channel_account_id']),
+				'abook_channel'   => intval($channel['channel_id']),
+				'abook_xchan'     => $ret['xchan_hash'],
+				'abook_closeness' => intval($closeness),
+				'abook_created'   => datetime_convert(),
+				'abook_updated'   => datetime_convert(),
+				'abook_connected' => datetime_convert(),
+				'abook_dob'       => NULL_DATE,
+				'abook_pending'   => intval(($automatic) ? 0 : 1),
+				'abook_instance'  => z_root()
+			]
+		);
+		
+		if($my_perms)
+			set_abconfig($channel['channel_id'],$ret['xchan_hash'],'system','my_perms',$my_perms);
+
+		if($their_perms)
+			set_abconfig($channel['channel_id'],$ret['xchan_hash'],'system','their_perms',$their_perms);
+
+
+		if($r) {
+			logger("New ActivityPub follower for {$channel['channel_name']}");
+
+			$new_connection = q("select * from abook left join xchan on abook_xchan = xchan_hash left join hubloc on hubloc_hash = xchan_hash where abook_channel = %d and abook_xchan = '%s' order by abook_created desc limit 1",
+				intval($channel['channel_id']),
+				dbesc($ret['xchan_hash'])
+			);
+			if($new_connection) {
+				\Zotlabs\Lib\Enotify::submit(
+					[
+						'type'	       => NOTIFY_INTRO,
+						'from_xchan'   => $ret['xchan_hash'],
+						'to_xchan'     => $channel['channel_hash'],
+						'link'         => z_root() . '/connedit/' . $new_connection[0]['abook_id'],
+					]
+				);
+
+				if($my_perms && $automatic) {
+					// send an Accept for this Follow activity
+					\Zotlabs\Daemon\Master::Summon([ 'Notifier', 'permissions_accept', $new_connection[0]['abook_id'] ]);
+					// Send back a Follow notification to them
+					\Zotlabs\Daemon\Master::Summon([ 'Notifier', 'permissions_create', $new_connection[0]['abook_id'] ]);
+				}
+
+				$clone = array();
+				foreach($new_connection[0] as $k => $v) {
+					if(strpos($k,'abook_') === 0) {
+						$clone[$k] = $v;
+					}
+				}
+				unset($clone['abook_id']);
+				unset($clone['abook_account']);
+				unset($clone['abook_channel']);
+		
+				$abconfig = load_abconfig($channel['channel_id'],$clone['abook_xchan']);
+
+				if($abconfig)
+					$clone['abconfig'] = $abconfig;
+
+				Libsync::build_sync_packet($channel['channel_id'], [ 'abook' => array($clone) ] );
+			}
+		}
+
+
+		/* If there is a default group for this channel and permissions are automatic, add this member to it */
+
+		if($channel['channel_default_group'] && $automatic) {
+			$g = Group::rec_byhash($channel['channel_id'],$channel['channel_default_group']);
+			if($g)
+				Group::member_add($channel['channel_id'],'',$ret['xchan_hash'],$g['id']);
+		}
+
+
+		return;
+
+	}
+
+
+	static function unfollow($channel,$act) {
+
+		$contact = null;
+
+		/* @FIXME This really needs to be a signed request. */
+
+		/* actor is unfollowing $channel */
+
+		$person_obj = $act->actor;
+
+		if(is_array($person_obj)) {
+
+			$r = q("select * from abook left join xchan on abook_xchan = xchan_hash where abook_xchan = '%s' and abook_channel = %d limit 1",
+				dbesc($person_obj['id']),
+				intval($channel['channel_id'])
+			);
+			if($r) {
+				// remove all permissions they provided
+				del_abconfig($channel['channel_id'],$r[0]['xchan_hash'],'system','their_perms',EMPTY_STR);
+			}
+		}
+
+		return;
+	}
+
+
+
+
+	static function actor_store($url,$person_obj) {
+
+		if(! is_array($person_obj))
+			return;
+
+		$name = $person_obj['name'];
+		if(! $name)
+			$name = $person_obj['preferredUsername'];
+		if(! $name)
+			$name = t('Unknown');
+
+		if($person_obj['icon']) {
+			if(is_array($person_obj['icon'])) {
+				if(array_key_exists('url',$person_obj['icon']))
+					$icon = $person_obj['icon']['url'];
+				else
+					$icon = $person_obj['icon'][0]['url'];
+			}
+			else
+				$icon = $person_obj['icon'];
+		}
+
+		if(is_array($person_obj['url']) && array_key_exists('href', $person_obj['url']))
+			$profile = $person_obj['url']['href'];
+		else
+			$profile = $url;
+
+
+		$inbox = $person_obj['inbox'];
+
+		$collections = [];
+
+		if($inbox) {
+			$collections['inbox'] = $inbox;
+			if($person_obj['outbox'])
+				$collections['outbox'] = $person_obj['outbox'];
+			if($person_obj['followers'])
+				$collections['followers'] = $person_obj['followers'];
+			if($person_obj['following'])
+				$collections['following'] = $person_obj['following'];
+			if($person_obj['endpoints'] && $person_obj['endpoints']['sharedInbox'])
+				$collections['sharedInbox'] = $person_obj['endpoints']['sharedInbox'];
+		}
+
+		if(array_key_exists('publicKey',$person_obj) && array_key_exists('publicKeyPem',$person_obj['publicKey'])) {
+			if($person_obj['id'] === $person_obj['publicKey']['owner']) {
+				$pubkey = $person_obj['publicKey']['publicKeyPem'];
+				if(strstr($pubkey,'RSA ')) {
+					$pubkey = rsatopem($pubkey);
+				}
+			}
+		}
+
+		$r = q("select * from xchan where xchan_hash = '%s' limit 1",
+			dbesc($url)
+		);
+		if(! $r) {
+			// create a new record
+			$r = xchan_store_lowlevel(
+				[
+					'xchan_hash'         => $url,
+					'xchan_guid'         => $url,
+					'xchan_pubkey'       => $pubkey,
+					'xchan_addr'         => '',
+					'xchan_url'          => $profile,
+					'xchan_name'         => $name,
+					'xchan_name_date'    => datetime_convert(),
+					'xchan_network'      => 'activitypub'
+				]
+			);
+		}
+		else {
+
+			// Record exists. Cache existing records for one week at most
+			// then refetch to catch updated profile photos, names, etc. 
+
+			$d = datetime_convert('UTC','UTC','now - 1 week');
+			if($r[0]['xchan_name_date'] > $d)
+				return;
+
+			// update existing record
+			$r = q("update xchan set xchan_name = '%s', xchan_pubkey = '%s', xchan_network = '%s', xchan_name_date = '%s' where xchan_hash = '%s'",
+				dbesc($name),
+				dbesc($pubkey),
+				dbesc('activitypub'),
+				dbesc(datetime_convert()),
+				dbesc($url)
+			);
+		}
+
+		if($collections) {
+			set_xconfig($url,'activitypub','collections',$collections);
+		}
+
+		$r = q("select * from hubloc where hubloc_hash = '%s' limit 1",
+			dbesc($url)
+		);
+
+
+		$m = parse_url($url);
+		if($m) {
+			$hostname = $m['host'];
+			$baseurl = $m['scheme'] . '://' . $m['host'] . (($m['port']) ? ':' . $m['port'] : '');
+		}
+
+		if(! $r) {
+			$r = hubloc_store_lowlevel(
+				[
+					'hubloc_guid'     => $url,
+					'hubloc_hash'     => $url,
+					'hubloc_addr'     => '',
+					'hubloc_network'  => 'activitypub',
+					'hubloc_url'      => $baseurl,
+					'hubloc_host'     => $hostname,
+					'hubloc_callback' => $inbox,
+					'hubloc_updated'  => datetime_convert(),
+					'hubloc_primary'  => 1
+				]
+			);
+		}
+
+		if(! $icon)
+			$icon = z_root() . '/' . get_default_profile_photo(300);
+
+		$photos = import_xchan_photo($icon,$url);
+		$r = q("update xchan set xchan_photo_date = '%s', xchan_photo_l = '%s', xchan_photo_m = '%s', xchan_photo_s = '%s', xchan_photo_mimetype = '%s' where xchan_hash = '%s'",
+			dbescdate(datetime_convert('UTC','UTC',$arr['photo_updated'])),
+			dbesc($photos[0]),
+			dbesc($photos[1]),
+			dbesc($photos[2]),
+			dbesc($photos[3]),
+			dbesc($url)
+		);
+
+	}
+
+
+	static function create_action($channel,$observer_hash,$act) {
+
+		if(in_array($act->obj['type'], [ 'Note', 'Article', 'Video' ])) {
+			self::create_note($channel,$observer_hash,$act);
+		}
+
+
+	}
+
+	static function announce_action($channel,$observer_hash,$act) {
+
+		if(in_array($act->type, [ 'Announce' ])) {
+			self::announce_note($channel,$observer_hash,$act);
+		}
+
+	}
+
+
+	static function like_action($channel,$observer_hash,$act) {
+
+		if(in_array($act->obj['type'], [ 'Note', 'Article', 'Video' ])) {
+			self::like_note($channel,$observer_hash,$act);
+		}
+
+
+	}
+
+	// sort function width decreasing
+
+	static function as_vid_sort($a,$b) {
+		if($a['width'] === $b['width'])
+			return 0;
+		return (($a['width'] > $b['width']) ? -1 : 1);
+	}
+
+	static function create_note($channel,$observer_hash,$act) {
+
+		$s = [];
+
+		// Mastodon only allows visibility in public timelines if the public inbox is listed in the 'to' field.
+		// They are hidden in the public timeline if the public inbox is listed in the 'cc' field.
+		// This is not part of the activitypub protocol - we might change this to show all public posts in pubstream at some point.
+		$pubstream = ((is_array($act->obj) && array_key_exists('to', $act->obj) && in_array(ACTIVITY_PUBLIC_INBOX, $act->obj['to'])) ? true : false);
+		$is_sys_channel = is_sys_channel($channel['channel_id']);
+
+		$parent = ((array_key_exists('inReplyTo',$act->obj)) ? urldecode($act->obj['inReplyTo']) : '');
+		if($parent) {
+
+			$r = q("select * from item where uid = %d and ( mid = '%s' or  mid = '%s' ) limit 1",
+				intval($channel['channel_id']),
+				dbesc($parent),
+				dbesc(basename($parent))
+			);
+
+			if(! $r) {
+				logger('parent not found.');
+				return;
+			}
+
+			if($r[0]['owner_xchan'] === $channel['channel_hash']) {
+				if(! perm_is_allowed($channel['channel_id'],$observer_hash,'send_stream') && ! ($is_sys_channel && $pubstream)) {
+					logger('no comment permission.');
+					return;
+				}
+			}
+
+			$s['parent_mid'] = $r[0]['mid'];
+			$s['owner_xchan'] = $r[0]['owner_xchan'];
+			$s['author_xchan'] = $observer_hash;
+
+		}
+		else {
+			if(! perm_is_allowed($channel['channel_id'],$observer_hash,'send_stream') && ! ($is_sys_channel && $pubstream)) {
+				logger('no permission');
+				return;
+			}
+			$s['owner_xchan'] = $s['author_xchan'] = $observer_hash;
+		}
+	
+		$abook = q("select * from abook where abook_xchan = '%s' and abook_channel = %d limit 1",
+			dbesc($observer_hash),
+			intval($channel['channel_id'])
+		);
+	
+		$content = self::get_content($act->obj);
+
+		if(! $content) {
+			logger('no content');
+			return;
+		}
+
+		$s['aid'] = $channel['channel_account_id'];
+		$s['uid'] = $channel['channel_id'];
+		$s['mid'] = urldecode($act->obj['id']);
+		$s['plink'] = urldecode($act->obj['id']);
+
+
+		if($act->data['published']) {
+			$s['created'] = datetime_convert('UTC','UTC',$act->data['published']);
+		}
+		elseif($act->obj['published']) {
+			$s['created'] = datetime_convert('UTC','UTC',$act->obj['published']);
+		}
+		if($act->data['updated']) {
+			$s['edited'] = datetime_convert('UTC','UTC',$act->data['updated']);
+		}
+		elseif($act->obj['updated']) {
+			$s['edited'] = datetime_convert('UTC','UTC',$act->obj['updated']);
+		}
+
+		if(! $s['created'])
+			$s['created'] = datetime_convert();
+
+		if(! $s['edited'])
+			$s['edited'] = $s['created'];
+
+
+		if(! $s['parent_mid'])
+			$s['parent_mid'] = $s['mid'];
+
+	
+		$s['title']    = self::bb_content($content,'name');
+		$s['summary']  = self::bb_content($content,'summary'); 
+		$s['body']     = self::bb_content($content,'content');
+		$s['verb']     = ACTIVITY_POST;
+		$s['obj_type'] = ACTIVITY_OBJ_NOTE;
+
+		$instrument = $act->get_property_obj('instrument');
+		if(! $instrument)
+			$instrument = $act->get_property_obj('instrument',$act->obj);
+
+		if($instrument && array_key_exists('type',$instrument) 
+			&& $instrument['type'] === 'Service' && array_key_exists('name',$instrument)) {
+			$s['app'] = escape_tags($instrument['name']);
+		}
+
+		if($channel['channel_system']) {
+			if(! \Zotlabs\Lib\MessageFilter::evaluate($s,get_config('system','pubstream_incl'),get_config('system','pubstream_excl'))) {
+				logger('post is filtered');
+				return;
+			}
+		}
+
+
+		if($abook) {
+			if(! post_is_importable($s,$abook[0])) {
+				logger('post is filtered');
+				return;
+			}
+		}
+
+		if($act->obj['conversation']) {
+			set_iconfig($s,'ostatus','conversation',$act->obj['conversation'],1);
+		}
+
+		$a = self::decode_taxonomy($act->obj);
+		if($a) {
+			$s['term'] = $a;
+		}
+
+		$a = self::decode_attachment($act->obj);
+		if($a) {
+			$s['attach'] = $a;
+		}
+
+		if($act->obj['type'] === 'Note' && $s['attach']) {
+			$s['body'] .= self::bb_attach($s['attach']);
+		}
+
+		// we will need a hook here to extract magnet links e.g. peertube
+		// right now just link to the largest mp4 we find that will fit in our
+		// standard content region
+
+		if($act->obj['type'] === 'Video') {
+
+			$vtypes = [
+				'video/mp4',
+				'video/ogg',
+				'video/webm'
+			];
+
+			$mps = [];
+			if(array_key_exists('url',$act->obj) && is_array($act->obj['url'])) {
+				foreach($act->obj['url'] as $vurl) {
+					if(in_array($vurl['mimeType'], $vtypes)) {
+						if(! array_key_exists('width',$vurl)) {
+							$vurl['width'] = 0;
+						}
+						$mps[] = $vurl;
+					}
+				}
+			}
+			if($mps) {
+				usort($mps,'as_vid_sort');
+				foreach($mps as $m) {
+					if(intval($m['width']) < 500) {
+						$s['body'] .= "\n\n" . '[video]' . $m['href'] . '[/video]';
+						break;
+					}
+				}
+			}
+		}
+
+		if($act->recips && (! in_array(ACTIVITY_PUBLIC_INBOX,$act->recips)))
+			$s['item_private'] = 1;
+
+		set_iconfig($s,'activitypub','recips',$act->raw_recips);
+		if($parent) {
+			set_iconfig($s,'activitypub','rawmsg',$act->raw,1);
+		}
+
+		$x = null;
+
+		$r = q("select created, edited from item where mid = '%s' and uid = %d limit 1",
+			dbesc($s['mid']),
+			intval($s['uid'])
+		);
+		if($r) {
+			if($s['edited'] > $r[0]['edited']) {
+				$x = item_store_update($s);
+			}
+			else {
+				return;
+			}
+		}
+		else {
+			$x = item_store($s);
+		}
+
+		if(is_array($x) && $x['item_id']) {
+			if($parent) {
+				if($s['owner_xchan'] === $channel['channel_hash']) {
+					// We are the owner of this conversation, so send all received comments back downstream
+					Zotlabs\Daemon\Master::Summon(array('Notifier','comment-import',$x['item_id']));
+				}
+				$r = q("select * from item where id = %d limit 1",
+					intval($x['item_id'])
+				);
+				if($r) {
+					send_status_notifications($x['item_id'],$r[0]);
+				}
+			}
+			sync_an_item($channel['channel_id'],$x['item_id']);
+		}
+
+	}
+
+
+	static function decode_note($act) {
+
+		$s = [];
+
+
+
+		$content = self::get_content($act->obj);
+
+		$s['owner_xchan']  = $act->actor['id'];
+		$s['author_xchan'] = $act->actor['id'];
+
+		$s['mid']        = $act->id;
+		$s['parent_mid'] = $act->parent_id;
+
+
+		if($act->data['published']) {
+			$s['created'] = datetime_convert('UTC','UTC',$act->data['published']);
+		}
+		elseif($act->obj['published']) {
+			$s['created'] = datetime_convert('UTC','UTC',$act->obj['published']);
+		}
+		if($act->data['updated']) {
+			$s['edited'] = datetime_convert('UTC','UTC',$act->data['updated']);
+		}
+		elseif($act->obj['updated']) {
+			$s['edited'] = datetime_convert('UTC','UTC',$act->obj['updated']);
+		}
+
+		if(! $s['created'])
+			$s['created'] = datetime_convert();
+
+		if(! $s['edited'])
+			$s['edited'] = $s['created'];
+
+		if(in_array($act->type,['Announce'])) {
+			$root_content = self::get_content($act->raw);
+
+			$s['title']    = self::bb_content($root_content,'name');
+			$s['summary']  = self::bb_content($root_content,'summary');
+			$s['body']     = (self::bb_content($root_content,'bbcode') ? : self::bb_content($root_content,'content'));
+
+			if(strpos($s['body'],'[share') === false) {
+
+				// @fixme - error check and set defaults
+
+				$name = urlencode($act->obj['actor']['name']);
+				$profile = $act->obj['actor']['id'];
+				$photo = $act->obj['icon']['url'];
+
+				$s['body'] .= "\r\n[share author='" . $name .
+					"' profile='" . $profile .
+					"' avatar='" . $photo . 
+					"' link='" . $act->obj['id'] .
+					"' auth='" . ((is_matrix_url($act->obj['id'])) ? 'true' : 'false' ) . 
+					"' posted='" . $act->obj['published'] . 
+					"' message_id='" . $act->obj['id'] . 
+				"']";
+			}
+		}
+		else {
+			$s['title']    = self::bb_content($content,'name');
+			$s['summary']  = self::bb_content($content,'summary');
+			$s['body']     = (self::bb_content($content,'bbcode') ? : self::bb_content($content,'content'));
+		}
+
+		$s['verb']     = self::activity_mapper($act->type);
+
+		if($act->type === 'Tombstone') {
+			$s['item_deleted'] = 1;
+		}
+
+		$s['obj_type'] = self::activity_obj_mapper($act->obj['type']);
+		$s['obj']      = $act->obj;
+
+		$instrument = $act->get_property_obj('instrument');
+		if(! $instrument)
+			$instrument = $act->get_property_obj('instrument',$act->obj);
+
+		if($instrument && array_key_exists('type',$instrument) 
+			&& $instrument['type'] === 'Service' && array_key_exists('name',$instrument)) {
+			$s['app'] = escape_tags($instrument['name']);
+		}
+
+		$a = self::decode_taxonomy($act->obj);
+		if($a) {
+			$s['term'] = $a;
+		}
+
+		$a = self::decode_attachment($act->obj);
+		if($a) {
+			$s['attach'] = $a;
+		}
+
+		// we will need a hook here to extract magnet links e.g. peertube
+		// right now just link to the largest mp4 we find that will fit in our
+		// standard content region
+
+		if($act->obj['type'] === 'Video') {
+
+			$vtypes = [
+				'video/mp4',
+				'video/ogg',
+				'video/webm'
+			];
+
+			$mps = [];
+			if(array_key_exists('url',$act->obj) && is_array($act->obj['url'])) {
+				foreach($act->obj['url'] as $vurl) {
+					if(in_array($vurl['mimeType'], $vtypes)) {
+						if(! array_key_exists('width',$vurl)) {
+							$vurl['width'] = 0;
+						}
+						$mps[] = $vurl;
+					}
+				}
+			}
+			if($mps) {
+				usort($mps,'as_vid_sort');
+				foreach($mps as $m) {
+					if(intval($m['width']) < 500) {
+						$s['body'] .= "\n\n" . '[video]' . $m['href'] . '[/video]';
+						break;
+					}
+				}
+			}
+		}
+
+		if($act->recips && (! in_array(ACTIVITY_PUBLIC_INBOX,$act->recips)))
+			$s['item_private'] = 1;
+
+		set_iconfig($s,'activitypub','recips',$act->raw_recips);
+
+		if($parent) {
+			set_iconfig($s,'activitypub','rawmsg',$act->raw,1);
+		}
+
+		return $s;
+
+	}
+
+
+
+	static function announce_note($channel,$observer_hash,$act) {
+
+		$s = [];
+
+		$is_sys_channel = is_sys_channel($channel['channel_id']);
+
+		// Mastodon only allows visibility in public timelines if the public inbox is listed in the 'to' field.
+		// They are hidden in the public timeline if the public inbox is listed in the 'cc' field.
+		// This is not part of the activitypub protocol - we might change this to show all public posts in pubstream at some point.
+		$pubstream = ((is_array($act->obj) && array_key_exists('to', $act->obj) && in_array(ACTIVITY_PUBLIC_INBOX, $act->obj['to'])) ? true : false);
+
+		if(! perm_is_allowed($channel['channel_id'],$observer_hash,'send_stream') && ! ($is_sys_channel && $pubstream)) {
+			logger('no permission');
+			return;
+		}
+
+		$content = self::get_content($act->obj);
+
+		if(! $content) {
+			logger('no content');
+			return;
+		}
+
+		$s['owner_xchan'] = $s['author_xchan'] = $observer_hash;
+
+		$s['aid'] = $channel['channel_account_id'];
+		$s['uid'] = $channel['channel_id'];
+		$s['mid'] = urldecode($act->obj['id']);
+		$s['plink'] = urldecode($act->obj['id']);
+
+		if(! $s['created'])
+			$s['created'] = datetime_convert();
+
+		if(! $s['edited'])
+			$s['edited'] = $s['created'];
+
+
+		$s['parent_mid'] = $s['mid'];
+
+		$s['verb']     = ACTIVITY_POST;
+		$s['obj_type'] = ACTIVITY_OBJ_NOTE;
+		$s['app']      = t('ActivityPub');
+
+		if($channel['channel_system']) {
+			if(! \Zotlabs\Lib\MessageFilter::evaluate($s,get_config('system','pubstream_incl'),get_config('system','pubstream_excl'))) {
+				logger('post is filtered');
+				return;
+			}
+		}
+
+		$abook = q("select * from abook where abook_xchan = '%s' and abook_channel = %d limit 1",
+			dbesc($observer_hash),
+			intval($channel['channel_id'])
+		);
+
+		if($abook) {
+			if(! post_is_importable($s,$abook[0])) {
+				logger('post is filtered');
+				return;
+			}
+		}
+
+		if($act->obj['conversation']) {
+			set_iconfig($s,'ostatus','conversation',$act->obj['conversation'],1);
+		}
+
+		$a = self::decode_taxonomy($act->obj);
+		if($a) {
+			$s['term'] = $a;
+		}
+
+		$a = self::decode_attachment($act->obj);
+		if($a) {
+			$s['attach'] = $a;
+		}
+
+		$body = "[share author='" . urlencode($act->sharee['name']) . 
+			"' profile='" . $act->sharee['url'] . 
+			"' avatar='" . $act->sharee['photo_s'] . 
+			"' link='" . ((is_array($act->obj['url'])) ? $act->obj['url']['href'] : $act->obj['url']) . 
+			"' auth='" . ((is_matrix_url($act->obj['url'])) ? 'true' : 'false' ) . 
+			"' posted='" . $act->obj['published'] . 
+			"' message_id='" . $act->obj['id'] . 
+		"']";
+
+		if($content['name'])
+			$body .= self::bb_content($content,'name') . "\r\n";
+
+		$body .= self::bb_content($content,'content');
+
+		if($act->obj['type'] === 'Note' && $s['attach']) {
+			$body .= self::bb_attach($s['attach']);
+		}
+
+		$body .= "[/share]";
+
+		$s['title']    = self::bb_content($content,'name');
+		$s['body']     = $body;
+
+		if($act->recips && (! in_array(ACTIVITY_PUBLIC_INBOX,$act->recips)))
+			$s['item_private'] = 1;
+
+		set_iconfig($s,'activitypub','recips',$act->raw_recips);
+
+		$r = q("select created, edited from item where mid = '%s' and uid = %d limit 1",
+			dbesc($s['mid']),
+			intval($s['uid'])
+		);
+		if($r) {
+			if($s['edited'] > $r[0]['edited']) {
+				$x = item_store_update($s);
+			}
+			else {
+				return;
+			}
+		}
+		else {
+			$x = item_store($s);
+		}
+
+
+		if(is_array($x) && $x['item_id']) {
+			if($parent) {
+				if($s['owner_xchan'] === $channel['channel_hash']) {
+					// We are the owner of this conversation, so send all received comments back downstream
+					Zotlabs\Daemon\Master::Summon(array('Notifier','comment-import',$x['item_id']));
+				}
+				$r = q("select * from item where id = %d limit 1",
+					intval($x['item_id'])
+				);
+				if($r) {
+					send_status_notifications($x['item_id'],$r[0]);
+				}
+			}
+			sync_an_item($channel['channel_id'],$x['item_id']);
+		}
+
+
+	}
+
+	static function like_note($channel,$observer_hash,$act) {
+
+		$s = [];
+
+		$parent = $act->obj['id'];
+	
+		if($act->type === 'Like')
+			$s['verb'] = ACTIVITY_LIKE;
+		if($act->type === 'Dislike')
+			$s['verb'] = ACTIVITY_DISLIKE;
+
+		if(! $parent)
+			return;
+
+		$r = q("select * from item where uid = %d and ( mid = '%s' or  mid = '%s' ) limit 1",
+			intval($channel['channel_id']),
+			dbesc($parent),
+			dbesc(urldecode(basename($parent)))
+		);
+
+		if(! $r) {
+			logger('parent not found.');
+			return;
+		}
+
+		xchan_query($r);
+		$parent_item = $r[0];
+
+		if($parent_item['owner_xchan'] === $channel['channel_hash']) {
+			if(! perm_is_allowed($channel['channel_id'],$observer_hash,'post_comments')) {
+				logger('no comment permission.');
+				return;
+			}
+		}
+
+		if($parent_item['mid'] === $parent_item['parent_mid']) {
+			$s['parent_mid'] = $parent_item['mid'];
+		}
+		else {
+			$s['thr_parent'] = $parent_item['mid'];
+			$s['parent_mid'] = $parent_item['parent_mid'];
+		}
+
+		$s['owner_xchan'] = $parent_item['owner_xchan'];
+		$s['author_xchan'] = $observer_hash;
+	
+		$s['aid'] = $channel['channel_account_id'];
+		$s['uid'] = $channel['channel_id'];
+		$s['mid'] = $act->id;
+
+		if(! $s['parent_mid'])
+			$s['parent_mid'] = $s['mid'];
+	
+
+		$post_type = (($parent_item['resource_type'] === 'photo') ? t('photo') : t('status'));
+
+		$links = array(array('rel' => 'alternate','type' => 'text/html', 'href' => $parent_item['plink']));
+		$objtype = (($parent_item['resource_type'] === 'photo') ? ACTIVITY_OBJ_PHOTO : ACTIVITY_OBJ_NOTE );
+
+		$body = $parent_item['body'];
+
+		$z = q("select * from xchan where xchan_hash = '%s' limit 1",
+			dbesc($parent_item['author_xchan'])
+		);
+		if($z)
+			$item_author = $z[0];		
+
+		$object = json_encode(array(
+			'type'    => $post_type,
+			'id'      => $parent_item['mid'],
+			'parent'  => (($parent_item['thr_parent']) ? $parent_item['thr_parent'] : $parent_item['parent_mid']),
+			'link'    => $links,
+			'title'   => $parent_item['title'],
+			'content' => $parent_item['body'],
+			'created' => $parent_item['created'],
+			'edited'  => $parent_item['edited'],
+			'author'  => array(
+				'name'     => $item_author['xchan_name'],
+				'address'  => $item_author['xchan_addr'],
+				'guid'     => $item_author['xchan_guid'],
+				'guid_sig' => $item_author['xchan_guid_sig'],
+				'link'     => array(
+					array('rel' => 'alternate', 'type' => 'text/html', 'href' => $item_author['xchan_url']),
+					array('rel' => 'photo', 'type' => $item_author['xchan_photo_mimetype'], 'href' => $item_author['xchan_photo_m'])),
+				),
+			), JSON_UNESCAPED_SLASHES
+		);
+
+		if($act->type === 'Like')
+			$bodyverb = t('%1$s likes %2$s\'s %3$s');
+		if($act->type === 'Dislike')
+			$bodyverb = t('%1$s doesn\'t like %2$s\'s %3$s');
+
+		$ulink = '[url=' . $item_author['xchan_url'] . ']' . $item_author['xchan_name'] . '[/url]';
+		$alink = '[url=' . $parent_item['author']['xchan_url'] . ']' . $parent_item['author']['xchan_name'] . '[/url]';
+		$plink = '[url='. z_root() . '/display/' . urlencode($act->id) . ']' . $post_type . '[/url]';
+		$s['body'] =  sprintf( $bodyverb, $ulink, $alink, $plink );
+
+		$s['app']  = t('ActivityPub');
+
+		// set the route to that of the parent so downstream hubs won't reject it.
+
+		$s['route'] = $parent_item['route'];
+		$s['item_private'] = $parent_item['item_private'];
+		$s['obj_type'] = $objtype;
+		$s['obj'] = $object;
+
+		if($act->obj['conversation']) {
+			set_iconfig($s,'ostatus','conversation',$act->obj['conversation'],1);
+		}
+
+		if($act->recips && (! in_array(ACTIVITY_PUBLIC_INBOX,$act->recips)))
+			$s['item_private'] = 1;
+
+		set_iconfig($s,'activitypub','recips',$act->raw_recips);
+
+		$result = item_store($s);
+
+		if($result['success']) {
+			// if the message isn't already being relayed, notify others
+			if(intval($parent_item['item_origin']))
+					Zotlabs\Daemon\Master::Summon(array('Notifier','comment-import',$result['item_id']));
+				sync_an_item($channel['channel_id'],$result['item_id']);
+		}
+
+		return;
+	}
+
+
+	static function bb_attach($attach) {
+
+		$ret = false;
+
+		foreach($attach as $a) {
+			if(strpos($a['type'],'image') !== false) {
+				$ret .= "\n\n" . '[img]' . $a['href'] . '[/img]';
+			}
+			if(array_key_exists('type',$a) && strpos($a['type'], 'video') === 0) {
+				$ret .= "\n\n" . '[video]' . $a['href'] . '[/video]';
+			}
+			if(array_key_exists('type',$a) && strpos($a['type'], 'audio') === 0) {
+				$ret .= "\n\n" . '[audio]' . $a['href'] . '[/audio]';
+			}
+		}
+
+		return $ret;
+	}
+
+
+
+	static function bb_content($content,$field) {
+
+		require_once('include/html2bbcode.php');
+
+		$ret = false;
+
+		if(is_array($content[$field])) {
+			foreach($content[$field] as $k => $v) {
+				$ret .= '[language=' . $k . ']' . html2bbcode($v) . '[/language]';
+			}
+		}
+		else {
+			if($field === 'bbcode' && array_key_exists('bbcode',$content)) {
+				$ret = $content[$field];
+			}
+			else {
+				$ret = html2bbcode($content[$field]);
+			}
+		}
+
+		return $ret;
+	}
+
+
+	static function get_content($act) {
+
+		$content = [];
+		if (! $act) {
+			return $content;
+		}
+
+		foreach ([ 'name', 'summary', 'content' ] as $a) {
+			if (($x = self::get_textfield($act,$a)) !== false) {
+				$content[$a] = $x;
+			}
+		}
+		if (array_key_exists('source',$act) && array_key_exists('mediaType',$act['source'])) {
+			if ($act['source']['mediaType'] === 'text/bbcode') {
+				$content['bbcode'] = purify_html($act['source']['content']);
+			}
+		}
+
+		return $content;
+	}
+
+
+	static function get_textfield($act,$field) {
+	
+		$content = false;
+
+		if(array_key_exists($field,$act) && $act[$field])
+			$content = purify_html($act[$field]);
+		elseif(array_key_exists($field . 'Map',$act) && $act[$field . 'Map']) {
+			foreach($act[$field . 'Map'] as $k => $v) {
+				$content[escape_tags($k)] = purify_html($v);
+			}
+		}
+		return $content;
+	}
+}
\ No newline at end of file
-- 
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