<?php


	require_once('boot.php');

	$a = new App;

	@include('.htconfig.php');
	require_once('dba.php');
	$db = new dba($db_host, $db_user, $db_pass, $db_data);
		unset($db_host, $db_user, $db_pass, $db_data);

	require_once('session.php');
	require_once('datetime.php');
	require_once('simplepie/simplepie.inc');
	require_once('include/items.php');

	require_once('include/Contact.php');

	$debugging = get_config('system','debugging');

	$a->set_baseurl(get_config('system','url'));

	// 'stat' clause is a temporary measure until we have federation subscriptions working both directions
	$contacts = q("SELECT * FROM `contact` 
		WHERE ( ( `network` = 'dfrn' AND ( `dfrn-id` != '' OR (`issued-id` != '' AND `duplex` = 1)))
		OR ( `network` = 'stat' AND `poll` != '' ) ) 
		AND `self` = 0 AND `blocked` = 0 AND `readonly` = 0 ORDER BY RAND()");

	if(! count($contacts))
		killme();

	foreach($contacts as $contact) {

		if($contact['priority'] || $contact['subhub']) {

			$update = false;

			// We should be getting everything via a hub. But just to be sure, let's check once a day.
			// This also lets us update our subscription to the hub, and add or replace hubs in case it
			// changed. 

			if($contact['subhub'])
				$contact['priority'] = 3;

			$t = $contact['last-update'];

			switch ($contact['priority']) {
				case 5:
					if(datetime_convert('UTC','UTC', 'now') > datetime_convert('UTC','UTC', $t . " + 1 month"))
						$update = true;
					break;					
				case 4:
					if(datetime_convert('UTC','UTC', 'now') > datetime_convert('UTC','UTC', $t . " + 1 week"))
						$update = true;
					break;
				case 3:
					if(datetime_convert('UTC','UTC', 'now') > datetime_convert('UTC','UTC', $t . " + 1 day"))
						$update = true;
					break;
				case 2:
					if(datetime_convert('UTC','UTC', 'now') > datetime_convert('UTC','UTC', $t . " + 12 hour"))
						$update = true;
					break;
				case 1:
				default:
					if(datetime_convert('UTC','UTC', 'now') > datetime_convert('UTC','UTC', $t . " + 1 hour"))
						$update = true;
					break;
			}
			if(! $update)
				continue;
		}

		$importer_uid = $contact['uid'];

		$r = q("SELECT * FROM `contact` WHERE `uid` = %d AND `self` = 1 LIMIT 1",
			intval($importer_uid)
		);
		if(! count($r))
			continue;

		$importer = $r[0];

		if($debugging)
			echo "IMPORTER: {$importer['name']}\n";

		$last_update = (($contact['last-update'] === '0000-00-00 00:00:00') 
			? datetime_convert('UTC','UTC','now - 30 days', ATOM_TIME)
			: datetime_convert('UTC','UTC',$contact['last-update'], ATOM_TIME)
		);

		if($contact['network'] === 'dfrn') {

			$idtosend = $orig_id = (($contact['dfrn-id']) ? $contact['dfrn-id'] : $contact['issued-id']);

			if(intval($contact['duplex']) && $contact['dfrn-id'])
				$idtosend = '0:' . $orig_id;
			if(intval($contact['duplex']) && $contact['issued-id'])
				$idtosend = '1:' . $orig_id;		

			$url = $contact['poll'] . '?dfrn_id=' . $idtosend 
				. '&dfrn_version=' . DFRN_PROTOCOL_VERSION 
				. '&type=data&last_update=' . $last_update ;
	
			$xml = fetch_url($url);

			if($debugging) {
				echo "URL: " . $url . "\n";
				echo "XML: " . $xml . "\n";
			}

			if(! $xml) {
				// dead connection - might be a transient event, or this might
				// mean the software was uninstalled or the domain expired. 
				// Will keep trying for one month.
				mark_for_death($contact);
				continue;
			}


			$res = simplexml_load_string($xml);

			if(intval($res->status) == 1) {
				// we may not be friends anymore. Will keep trying for one month.
				mark_for_death($contact);
			}
			else {
				if($contact['term-date'] != '0000-00-00 00:00:00')
					unmark_for_death($contact);
			}

			if((intval($res->status) != 0) || (! strlen($res->challenge)) || (! strlen($res->dfrn_id)))
				continue;

			$postvars = array();

			$sent_dfrn_id = hex2bin($res->dfrn_id);
			$challenge    = hex2bin($res->challenge);

			$final_dfrn_id = '';

			if(($contact['duplex']) && strlen($contact['prvkey'])) {
				openssl_private_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['prvkey']);
				openssl_private_decrypt($challenge,$postvars['challenge'],$contact['prvkey']);
			}
			else {
				openssl_public_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['pubkey']);
				openssl_public_decrypt($challenge,$postvars['challenge'],$contact['pubkey']);
			}

			$final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));

			if(strpos($final_dfrn_id,':') == 1)
				$final_dfrn_id = substr($final_dfrn_id,2);

			if($final_dfrn_id != $orig_id) {

				// did not decode properly - cannot trust this site 
				continue;
			}

			$postvars['dfrn_id'] = $idtosend;
			$postvars['dfrn_version'] = DFRN_PROTOCOL_VERSION;

			$xml = post_url($contact['poll'],$postvars);
		}
		else {
			// $contact['network'] !== 'dfrn'

			$xml = fetch_url($contact['poll']);
		}

		if($debugging) {
			echo "XML response:" . $xml . "\n";
			echo "Length:" . strlen($xml) . "\n";
		}

		if(! strlen($xml))
			continue;

		consume_feed($xml,$importer,$contact,$hub);
		
		if((strlen($hub)) && (($contact['rel'] == REL_BUD) || (($contact['network'] === 'stat') && (! $contact['readonly']))) && ($contact['priority'] == 0)) {
			$hubs = explode(',', $hub);
			if(count($hubs)) {
				foreach($hubs as $h) {
					$h = trim($h);
					if(! strlen($h))
						continue;
					subscribe_to_hub($h,$importer,$contact);
				}
			}
		}


		$r = q("UPDATE `contact` SET `last-update` = '%s' WHERE `id` = %d LIMIT 1",
			dbesc(datetime_convert()),
			intval($contact['id'])
		);

		// loop - next contact
	}  
		
	killme();