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<?php /** @file */

require_once("boot.php");
require_once('include/queue_fn.php');
require_once('include/html2plain.php');

/*
 * This file was at one time responsible for doing all deliveries, but this caused
 * big problems on shared hosting systems, where the process might get killed by the 
 * hosting provider and nothing would get delivered. 
 * It now only delivers one message under certain cases, and invokes a queued
 * delivery mechanism (include/deliver.php) to deliver individual contacts at 
 * controlled intervals.
 * This has a much better chance of surviving random processes getting killed
 * by the hosting provider. 
 *
 * The basic flow is:
 *   Identify the type of message
 *   Collect any information that needs to be sent
 *   Convert it into a suitable generic format for sending
 *   Figure out who the recipients are and if we need to relay 
 *       through a conversation owner
 *   Once we know what recipients are involved, collect a list of 
 *       destination sites
 *   Build and store a queue item for each unique site and invoke
 *       a delivery process for each site or a small number of sites (1-3)
 *       and add a slight delay between each delivery invocation if desired (usually)
 *   
 */

/*
 * The notifier is typically called with:
 *
 *		proc_run('php', "include/notifier.php", COMMAND, ITEM_ID);
 *
 * where COMMAND is one of the following:
 *
 *		activity				(in diaspora.php, dfrn_confirm.php, profiles.php)
 *		comment-import			(in diaspora.php, items.php)
 *		comment-new				(in item.php)
 *		drop					(in diaspora.php, items.php, photos.php)
 *		edit_post				(in item.php)
 *		event					(in events.php)
 *		expire					(in items.php)
 *		like					(in like.php, poke.php)
 *		mail					(in message.php)
 *		suggest					(in fsuggest.php)
 *		tag						(in photos.php, poke.php, tagger.php)
 *		tgroup					(in items.php)
 *		wall-new				(in photos.php, item.php)
 *
 * and ITEM_ID is the id of the item in the database that needs to be sent to others.
 *
 * ZOT 
 *       permission_update      abook_id
 *       refresh_all            channel_id
 *       purge_all              channel_id
 *       expire                 channel_id
 *       relay					item_id (item was relayed to owner, we will deliver it as owner)
 *       single_activity        item_id (deliver to a singleton network from the appropriate clone)
 *       single_mail            mail_id (deliver to a singleton network from the appropriate clone)
 *       location               channel_id
 *       request                channel_id            xchan_hash             message_id
 *       rating                 xlink_id
 *
 */

require_once('include/cli_startup.php');
require_once('include/zot.php');
require_once('include/queue_fn.php');

function notifier_run($argv, $argc){

	cli_startup();

	$a = get_app();

	require_once("session.php");
	require_once("datetime.php");
	require_once('include/items.php');
	require_once('include/bbcode.php');

	if($argc < 3)
		return;


	logger('notifier: invoked: ' . print_r($argv,true), LOGGER_DEBUG);

	$cmd = $argv[1];

	$item_id = $argv[2];

	$extra = (($argc > 3) ? $argv[3] : null);

	if(! $item_id)
		return;

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

	$deliveries = array();

	$dead_hubs = array();

	$dh = q("select site_url from site where site_dead = 1");
	if($dh) {
		foreach($dh as $dead) {
			$dead_hubs[] = $dead['site_url'];
		}
	}


	if($cmd == 'permission_update' || $cmd == 'permission_create') {
		// Get the recipient	
		$r = q("select abook.*, hubloc.* from abook 
			left join hubloc on hubloc_hash = abook_xchan
			where abook_id = %d and abook_self = 0
			and not (hubloc_flags & %d) > 0  and not (hubloc_status & %d) > 0 limit 1",
			intval($item_id),
			intval(HUBLOC_FLAGS_DELETED),
			intval(HUBLOC_OFFLINE)
		);

		if($r) {
			// Get the sender
			$s = q("select * from channel left join xchan on channel_hash = xchan_hash where channel_id = %d limit 1",
				intval($r[0]['abook_channel'])
			);
			if($s) {
				$perm_update = array('sender' => $s[0], 'recipient' => $r[0], 'success' => false, 'deliveries' => '');

				if($cmd == 'permission_create')
					call_hooks('permissions_create',$perm_update);
				else
					call_hooks('permissions_update',$perm_update);

				if($perm_update['success'] && $perm_update['deliveries'])
					$deliveries[] = $perm_update['deliveries'];

				if(! $perm_update['success']) {
					// send a refresh message to each hub they have registered here	
					$h = q("select * from hubloc where hubloc_hash = '%s' 
						and not (hubloc_flags & %d) > 0  and not (hubloc_status & %d) > 0",
						dbesc($r[0]['hubloc_hash']),
						intval(HUBLOC_FLAGS_DELETED),
						intval(HUBLOC_OFFLINE)
					);
					if($h) {
						foreach($h as $hh) {
							if(in_array($hh['hubloc_url'],$dead_hubs)) {
								logger('skipping dead hub: ' . $hh['hubloc_url'], LOGGER_DEBUG);
									continue;
							}

							$data = zot_build_packet($s[0],'refresh',array(array(
								'guid' => $hh['hubloc_guid'],
								'guid_sig' => $hh['hubloc_guid_sig'],
								'url' => $hh['hubloc_url'])
							));
							if($data) {
								$hash = random_string();
								queue_insert(array(
									'hash'       => $hash,
									'account_id' => $s[0]['channel_account_id'],
									'channel_id' => $s[0]['channel_id'],
									'posturl'    => $hh['hubloc_callback'],
									'notify'     => $data,
								));
								$deliveries[] = $hash;
							}
						}
					}
				}

				if($deliveries) 
					do_delivery($deliveries);
			}
		}
		return;
	}	


	$expire = false;
	$request = false;
	$mail = false;
	$fsuggest = false;
	$top_level = false;
	$location  = false;
	$recipients = array();
	$url_recipients = array();
	$normal_mode = true;
	$packet_type = 'undefined';

	if($cmd === 'mail') {
		$normal_mode = false;
		$mail = true;
		$private = true;
		$message = q("SELECT * FROM `mail` WHERE `id` = %d LIMIT 1",
				intval($item_id)
		);
		if(! $message) {
			return;
		}
		xchan_mail_query($message[0]);
		$uid = $message[0]['channel_id'];
		$recipients[] = $message[0]['from_xchan']; // include clones
		$recipients[] = $message[0]['to_xchan'];
		$item = $message[0];

		$encoded_item = encode_mail($item);

		$s = q("select * from channel where channel_id = %d limit 1",
			intval($item['channel_id'])
		);
		if($s)
			$channel = $s[0];

	}
	elseif($cmd === 'request') {
		$channel_id = $item_id;
		$xchan = $argv[3];
		$request_message_id = $argv[4];

		$s = q("select * from channel where channel_id = %d limit 1",
			intval($channel_id)
		);
		if($s)
			$channel = $s[0];

		$private = true;
		$recipients[] = $xchan;
		$packet_type = 'request';
		$normal_mode = false;
	}
	elseif($cmd === 'expire') {

		// FIXME
		// This will require a special zot packet containing a list of item message_id's to be expired. 
		// This packet will be public, since we cannot selectively deliver here. 
		// We need the handling on this end to create the array, and the handling on the remote end
		// to verify permissions (for each item) and process it. Until this is complete, the expire feature will be disabled.
 
		return;

		$normal_mode = false;
		$expire = true;
		$items = q("SELECT * FROM item WHERE uid = %d AND item_wall = 1
			AND item_deleted = 1 AND `changed` > %s - INTERVAL %s",
			intval($item_id),
			db_utcnow(), db_quoteinterval('10 MINUTE')
		);
		$uid = $item_id;
		$item_id = 0;
		if(! $items)
			return;

	}
	elseif($cmd === 'suggest') {
		$normal_mode = false;
		$fsuggest = true;

		$suggest = q("SELECT * FROM `fsuggest` WHERE `id` = %d LIMIT 1",
			intval($item_id)
		);
		if(! count($suggest))
			return;
		$uid = $suggest[0]['uid'];
		$recipients[] = $suggest[0]['cid'];
		$item = $suggest[0];
	}
	elseif($cmd === 'refresh_all') {
		logger('notifier: refresh_all: ' . $item_id);
		$s = q("select * from channel where channel_id = %d limit 1",
			intval($item_id)
		);
		if($s)
			$channel = $s[0];
		$uid = $item_id;
		$recipients = array();
		$r = q("select abook_xchan from abook where abook_channel = %d",
			intval($item_id)
		);
		if($r) {
			foreach($r as $rr) {
				$recipients[] = $rr['abook_xchan'];
			}
		}
		$private = false;
		$packet_type = 'refresh';
	}
	elseif($cmd === 'location') {
		logger('notifier: location: ' . $item_id);
		$s = q("select * from channel where channel_id = %d limit 1",
			intval($item_id)
		);
		if($s)
			$channel = $s[0];
		$uid = $item_id;
		$recipients = array();
		$r = q("select abook_xchan from abook where abook_channel = %d",
			intval($item_id)
		);
		if($r) {
			foreach($r as $rr) {
				$recipients[] = $rr['abook_xchan'];
			}
		}

		$encoded_item = array('locations' => zot_encode_locations($channel),'type' => 'location', 'encoding' => 'zot');
		$target_item = array('aid' => $channel['channel_account_id'],'uid' => $channel['channel_id']);
		$private = false;
		$packet_type = 'location';
		$location = true;
	}
	elseif($cmd === 'purge_all') {
		logger('notifier: purge_all: ' . $item_id);
		$s = q("select * from channel where channel_id = %d limit 1",
			intval($item_id)
		);
		if($s)
			$channel = $s[0];
		$uid = $item_id;
		$recipients = array();
		$r = q("select abook_xchan from abook where abook_channel = %d",
			intval($item_id)
		);
		if($r) {
			foreach($r as $rr) {
				$recipients[] = $rr['abook_xchan'];
			}
		}
		$private = false;
		$packet_type = 'purge';
	}
	else {

		// Normal items

		// Fetch the target item

		$r = q("SELECT * FROM item WHERE id = %d and parent != 0 LIMIT 1",
			intval($item_id)
		);

		if(! $r)
			return;

		xchan_query($r);

		$r = fetch_post_tags($r);
		
		$target_item = $r[0];
		$deleted_item = false;

		if(intval($target_item['item_deleted'])) {
			logger('notifier: target item ITEM_DELETED', LOGGER_DEBUG);
			$deleted_item = true;
		}

		if(intval($target_item['item_type']) != ITEM_TYPE_POST) {
			logger('notifier: target item not forwardable: type ' . $target_item['item_type'], LOGGER_DEBUG);
			return;
		}
		if(intval($target_item['item_unpublished']) || intval($target_item['item_delayed'])) {
			logger('notifier: target item not published, so not forwardable', LOGGER_DEBUG);
			return;
		}

		if(strpos($target_item['postopts'],'nodeliver') !== false) {
			logger('notifier: target item is undeliverable', LOGGER_DEBUG);
			return;
		}

		$s = q("select * from channel left join xchan on channel_hash = xchan_hash where channel_id = %d limit 1",
			intval($target_item['uid'])
		);
		if($s)
			$channel = $s[0];

		if($channel['channel_hash'] !== $target_item['author_xchan'] && $channel['channel_hash'] !== $target_item['owner_xchan']) {
			logger("notifier: Sending channel {$channel['channel_hash']} is not owner {$target_item['owner_xchan']} or author {$target_item['author_xchan']}");
			return;
		}


		if($target_item['id'] == $target_item['parent']) {
			$parent_item = $target_item;
			$top_level_post = true;
		}
		else {
			// fetch the parent item
			$r = q("SELECT * from item where id = %d order by id asc",
				intval($target_item['parent'])
			);

			if(! $r)
				return;

			if(strpos($r[0]['postopts'],'nodeliver') !== false) {
				logger('notifier: target item is undeliverable', LOGGER_DEBUG);
				return;
			}

			xchan_query($r);
			$r = fetch_post_tags($r);
		
			$parent_item = $r[0];
			$top_level_post = false;
		}

		// avoid looping of discover items 12/4/2014

		if($sys && $parent_item['uid'] == $sys['channel_id'])
			return;

		$encoded_item = encode_item($target_item);
		
		// Send comments to the owner to re-deliver to everybody in the conversation
		// We only do this if the item in question originated on this site. This prevents looping.
		// To clarify, a site accepting a new comment is responsible for sending it to the owner for relay.
		// Relaying should never be initiated on a post that arrived from elsewhere.  

		// We should normally be able to rely on ITEM_ORIGIN, but start_delivery_chain() incorrectly set this
		// flag on comments for an extended period. So we'll also call comment_local_origin() which looks at
		// the hostname in the message_id and provides a second (fallback) opinion. 

		$relay_to_owner = (((! $top_level_post) && (intval($target_item['item_origin'])) && comment_local_origin($target_item)) ? true : false);



		$uplink = false;

		// $cmd === 'relay' indicates the owner is sending it to the original recipients
		// don't allow the item in the relay command to relay to owner under any circumstances, it will loop

		logger('notifier: relay_to_owner: ' . (($relay_to_owner) ? 'true' : 'false'), LOGGER_DATA);
		logger('notifier: top_level_post: ' . (($top_level_post) ? 'true' : 'false'), LOGGER_DATA);

		// tag_deliver'd post which needs to be sent back to the original author

		if(($cmd === 'uplink') && intval($parent_item['item_uplink']) && (! $top_level_post)) {
			logger('notifier: uplink');			
			$uplink = true;
		} 

		if(($relay_to_owner || $uplink) && ($cmd !== 'relay')) {
			logger('notifier: followup relay', LOGGER_DEBUG);
			$recipients = array(($uplink) ? $parent_item['source_xchan'] : $parent_item['owner_xchan']);
			$private = true;
			if(! $encoded_item['flags'])
				$encoded_item['flags'] = array();
			$encoded_item['flags'][] = 'relay';
		}
		else {
			logger('notifier: normal distribution', LOGGER_DEBUG);
			if($cmd === 'relay')
				logger('notifier: owner relay');

			// if our parent is a tag_delivery recipient, uplink to the original author causing
			// a delivery fork. 

			if(intval($parent_item['item_uplink']) && (! $top_level_post) && ($cmd !== 'uplink')) {
				logger('notifier: uplinking this item');
				proc_run('php','include/notifier.php','uplink',$item_id);
			}

			$private = false;
			$recipients = collect_recipients($parent_item,$private);

			// FIXME add any additional recipients such as mentions, etc.

			// don't send deletions onward for other people's stuff
			// TODO verify this is needed - copied logic from same place in old code

			if(intval($target_item['item_deleted']) && (! intval($target_item['item_wall']))) {
				logger('notifier: ignoring delete notification for non-wall item');
				return;
			}
		}

	}

	$walltowall = (($top_level_post && $channel['xchan_hash'] === $target_item['author_xchan']) ? true : false); 

	// Generic delivery section, we have an encoded item and recipients
	// Now start the delivery process

	$x = $encoded_item;
	$x['title'] = 'private';
	$x['body'] = 'private';
	logger('notifier: encoded item: ' . print_r($x,true), LOGGER_DATA);

	stringify_array_elms($recipients);
	if(! $recipients)
		return;

//	logger('notifier: recipients: ' . print_r($recipients,true));

	$env_recips = (($private) ? array() : null);

	$details = q("select xchan_hash, xchan_instance_url, xchan_network, xchan_addr, xchan_guid, xchan_guid_sig from xchan where xchan_hash in (" . implode(',',$recipients) . ")");

	$recip_list = array();

	if($details) {
		foreach($details as $d) {

			$recip_list[] = $d['xchan_addr'] . ' (' . $d['xchan_hash'] . ')'; 
			if($private)
				$env_recips[] = array('guid' => $d['xchan_guid'],'guid_sig' => $d['xchan_guid_sig'],'hash' => $d['xchan_hash']);

			if($d['xchan_network'] === 'mail' && $normal_mode) {
				$delivery_options = get_xconfig($d['xchan_hash'],'system','delivery_mode');
				if(! $delivery_options)
					format_and_send_email($channel,$d,$target_item);
			}



		}
	}

	if(($private) && (! $env_recips)) {
		// shouldn't happen
		logger('notifier: private message with no envelope recipients.' . print_r($argv,true));
	}
	
	logger('notifier: recipients (may be delivered to more if public): ' . print_r($recip_list,true), LOGGER_DEBUG);
	

	// Now we have collected recipients (except for external mentions, FIXME)
	// Let's reduce this to a set of hubs.

	$r = q("select * from hubloc where hubloc_hash in (" . implode(',',$recipients) . ") 
		and hubloc_error = 0 and hubloc_deleted = 0"
	);		
 

	if(! $r) {
		logger('notifier: no hubs');
		return;
	}

	$hubs = $r;



	/**
	 * Reduce the hubs to those that are unique. For zot hubs, we need to verify uniqueness by the sitekey, since it may have been 
	 * a re-install which has not yet been detected and pruned.
	 * For other networks which don't have or require sitekeys, we'll have to use the URL
	 */


	$hublist = array(); // this provides an easily printable list for the logs
	$dhubs   = array(); // delivery hubs where we store our resulting unique array
	$keys    = array(); // array of keys to check uniquness for zot hubs
	$urls    = array(); // array of urls to check uniqueness of hubs from other networks


	foreach($hubs as $hub) {
		if(in_array($hub['hubloc_url'],$dead_hubs)) {
			logger('skipping dead hub: ' . $hub['hubloc_url'], LOGGER_DEBUG);
			continue;
		}

		if($hub['hubloc_network'] == 'zot') {
			if(! in_array($hub['hubloc_sitekey'],$keys)) {
				$hublist[] = $hub['hubloc_host'];
				$dhubs[] = $hub;
				$keys[] = $hub['hubloc_sitekey'];
			}
		}
		else {
			if(! in_array($hub['hubloc_url'],$urls)) {
				$hublist[] = $hub['hubloc_host'];
				$dhubs[] = $hub;
				$urls[] = $hub['hubloc_url'];
			}
		}
	}

	logger('notifier: will notify/deliver to these hubs: ' . print_r($hublist,true), LOGGER_DEBUG);
			 

	foreach($dhubs as $hub) {

		if($hub['hubloc_network'] !== 'zot') {

			$narr = array(
				'channel' => $channel,
				'env_recips' => $env_recips,
				'recipients' => $recipients,
				'item' => $item,
				'target_item' => $target_item,
				'hub' => $hub,
				'top_level_post' => $top_level_post,
				'private' => $private,
				'followup' => $followup,
				'relay_to_owner' => $relay_to_owner,
				'uplink' => $uplink,
				'cmd' => $cmd,
				'expire' =>	$expire,
				'mail' => $mail,
				'location' => $location,
				'fsuggest' => $fsuggest,
				'request' => $request,
				'normal_mode' => $normal_mode,
				'packet_type' => $packet_type,
				'walltowall' => $walltowall,
				'queued' => array()
			);


			call_hooks('notifier_hub',$narr);
			if($narr['queued']) {
				foreach($narr['queued'] as $pq)
					$deliveries[] = $pq;
			}
			continue;

		}

		// default: zot protocol

		$hash = random_string();
		$packet = null;

		if($packet_type === 'refresh' || $packet_type === 'purge') {
			$packet = zot_build_packet($channel,$packet_type);
		}
		elseif($packet_type === 'request') {
			$packet = zot_build_packet($channel,$packet_type,$env_recips,$hub['hubloc_sitekey'],$hash,
				array('message_id' => $request_message_id)
			);
		}

		if($packet) {
			queue_insert(array(
				'hash'       => $hash,
				'account_id' => $channel['channel_account_id'],
				'channel_id' => $channel['channel_id'],
				'posturl'    => $hub['hubloc_callback'],
				'notify'     => $packet
			));
		}
		else {
			$packet = zot_build_packet($channel,'notify',$env_recips,(($private) ? $hub['hubloc_sitekey'] : null),$hash);
			queue_insert(array(
				'hash'       => $hash,
				'account_id' => $target_item['aid'],
				'channel_id' => $target_item['uid'],
				'posturl'    => $hub['hubloc_callback'],
				'notify'     => $packet,
				'msg'        => json_encode($encoded_item)
			));

			// only create delivery reports for normal undeleted items
			if(is_array($target_item) && array_key_exists('postopts',$target_item) && (! $target_item['item_deleted'])) {
				q("insert into dreport ( dreport_mid, dreport_site, dreport_recip, dreport_result, dreport_time, dreport_xchan, dreport_queue ) values ( '%s','%s','%s','%s','%s','%s','%s' ) ",
					dbesc($target_item['mid']),
					dbesc($hub['hubloc_host']),
					dbesc($hub['hubloc_host']),
					dbesc('queued'),
					dbesc(datetime_convert()),
					dbesc($channel['channel_hash']),
					dbesc($hash)
				);
			}
		}

		$deliveries[] = $hash;	
	}
	
	if($normal_mode) {
		$x = q("select * from hook where hook = 'notifier_normal'");
		if($x)
			proc_run('php','include/deliver_hooks.php', $target_item['id']);
	}

	if($deliveries)
		do_delivery($deliveries);

	logger('notifier: basic loop complete.', LOGGER_DEBUG);

	call_hooks('notifier_end',$target_item);

	logger('notifer: complete.');
	return;

}


if (array_search(__file__,get_included_files())===0){
  notifier_run($argv,$argc);
  killme();
}