friendica/include/poller.php

<?php
require_once("boot.php");

function poller_run($argv, $argc){
	global $a, $db;

	if(is_null($a)) {
		$a = new App;
	}
  
	if(is_null($db)) {
	    @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');

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

	logger('poller: start');
	
	// run queue delivery process in the background

	proc_run('php',"include/queue.php");
	
	// clear old cache
	q("DELETE FROM `cache` WHERE `updated` < '%s'",
		dbesc(datetime_convert('UTC','UTC',"now - 30 days")));

	$manual_id  = 0;
	$hub_update = false;
	$force      = false;

	if(($argc > 1) && ($argv[1] == 'force'))
		$force = true;

	if(($argc > 1) && intval($argv[1])) {
		$manual_id = intval($argv[1]);
		$force     = true;
	}

	$sql_extra = (($manual_id) ? " AND `id` = $manual_id " : "");

	$d = datetime_convert();
	call_hooks('cron', $d);

	reload_plugins();

	$contacts = q("SELECT `id` FROM `contact` 
		WHERE ( `rel` = %d OR `rel` = %d ) AND `poll` != ''
		$sql_extra 
		AND `self` = 0 AND `blocked` = 0 AND `readonly` = 0 ORDER BY RAND()",
		intval(REL_FAN),
		intval(REL_BUD)
	);

	if(! count($contacts)) {
		return;
	}

	foreach($contacts as $c) {

		$res = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
			intval($c['id'])
		);

		if(! count($res))
			continue;

		foreach($res as $contact) {
			if($manual_id)
				$contact['last-update'] = '0000-00-00 00:00:00';

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

				$hub_update = true;
				$update     = false;

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

				// We should be getting everything via a hub. But just to be sure, let's check once a day.
				// (You can make this more or less frequent if desired by setting 'pushpoll_frequency' appropriately)
				// This also lets us update our subscription to the hub, and add or replace hubs in case it
				// changed. We will only update hubs once a day, regardless of 'pushpoll_frequency'. 


				if($contact['subhub']) {
					$interval = get_config('system','pushpoll_frequency');
					$contact['priority'] = (($interval !== false) ? intval($interval) : 3);
					$hub_update = false;
	
					if((datetime_convert('UTC','UTC', 'now') > datetime_convert('UTC','UTC', $t . " + 1 day")) || $force)
							$hub_update = true;
				}

				/**
				 * Based on $contact['priority'], should we poll this site now? Or later?
				 */			

				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) && (! $force))
					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];

			logger("poller: poll: IMPORTER: {$importer['name']}, CONTACT: {$contact['name']}");

			$last_update = (($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);

				logger('poller: handshake with url ' . $url . ' returns xml: ' . $xml, LOGGER_DATA);


				if(! $xml) {
					logger("poller: $url appears to be dead - marking for death ");
					// dead connection - might be a transient event, or this might
					// mean the software was uninstalled or the domain expired. 
					// Will keep trying for one month.
					mark_for_death($contact);

					// set the last-update so we don't keep polling

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

					continue;
				}

				if(! strstr($xml,'<?xml')) {
					logger('poller: response from ' . $url . ' did not contain XML.');
					$r = q("UPDATE `contact` SET `last-update` = '%s' WHERE `id` = %d LIMIT 1",
						dbesc(datetime_convert()),
						intval($contact['id'])
					);
					continue;
				}


				$res = simplexml_load_string($xml);
	
				if(intval($res->status) == 1) {
					logger("poller: $url replied status 1 - marking for death ");

					// we may not be friends anymore. Will keep trying for one month.
					// set the last-update so we don't keep polling

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

					mark_for_death($contact);
				}
				else {
					if($contact['term-date'] != '0000-00-00 00:00:00') {
						logger("poller: $url back from the dead - removing mark for death");
						unmark_for_death($contact);
					}
				}

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

				$postvars = array();

				$sent_dfrn_id = hex2bin((string) $res->dfrn_id);
				$challenge    = hex2bin((string) $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']);
			}

			logger('poller: received xml : ' . $xml, LOGGER_DATA);

			if(! strstr($xml,'<?xml')) {
				logger('poller: post_handshake: response from ' . $url . ' did not contain XML.');
				$r = q("UPDATE `contact` SET `last-update` = '%s' WHERE `id` = %d LIMIT 1",
					dbesc(datetime_convert()),
					intval($contact['id'])
				);
				continue;
			}

			consume_feed($xml,$importer,$contact,$hub,1);

			// do it twice. Ensures that children of parents which may be later in the stream aren't tossed

			consume_feed($xml,$importer,$contact,$hub,1);


			if((strlen($hub)) && ($hub_update) 
				&& (($contact['rel'] == REL_BUD) || (($contact['network'] === 'stat') && (! $contact['readonly'])))) {
				logger('poller: subscribing to hub(s) : ' . $hub . ' contact name : ' . $contact['name'] . ' local user : ' . $importer['name']);
				$hubs = explode(',', $hub);
				if(count($hubs)) {
					foreach($hubs as $h) {
						$h = trim($h);
						if(! strlen($h))
							continue;
						subscribe_to_hub($h,$importer,$contact);
					}
				}
			}


			$updated = datetime_convert();

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

			// loop - next contact
		}
	}
		
	return;
}

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