friendica/boot.php

<?php

require_once('include/config.php');
require_once('include/network.php');
require_once('include/plugin.php');
require_once('include/text.php');
require_once('include/datetime.php');
require_once('include/pgettext.php');
require_once('include/nav.php');
require_once('include/cache.php');
require_once('library/Mobile_Detect/Mobile_Detect.php');
require_once('include/features.php');
require_once('include/identity.php');

require_once('update.php');
require_once('include/dbstructure.php');

define ( 'FRIENDICA_PLATFORM',     'Friendica');
define ( 'FRIENDICA_CODENAME',     'Lily of the valley');
define ( 'FRIENDICA_VERSION',      '3.4.3-dev' );
define ( 'DFRN_PROTOCOL_VERSION',  '2.23'    );
define ( 'DB_UPDATE_VERSION',      1190      );
define ( 'EOL',                    "<br />\r\n"     );
define ( 'ATOM_TIME',              'Y-m-d\TH:i:s\Z' );


/**
 *
 * Image storage quality. Lower numbers save space at cost of image detail.
 * For ease of upgrade, please do not change here. Change jpeg quality with
 * $a->config['system']['jpeg_quality'] = n;
 * in .htconfig.php, where n is netween 1 and 100, and with very poor results
 * below about 50
 *
 */

define ( 'JPEG_QUALITY',            100  );
/**
 * $a->config['system']['png_quality'] from 0 (uncompressed) to 9
 */
define ( 'PNG_QUALITY',             8  );

/**
 *
 * An alternate way of limiting picture upload sizes. Specify the maximum pixel
 * length that pictures are allowed to be (for non-square pictures, it will apply
 * to the longest side). Pictures longer than this length will be resized to be
 * this length (on the longest side, the other side will be scaled appropriately).
 * Modify this value using
 *
 *    $a->config['system']['max_image_length'] = n;
 *
 * in .htconfig.php
 *
 * If you don't want to set a maximum length, set to -1. The default value is
 * defined by 'MAX_IMAGE_LENGTH' below.
 *
 */
define ( 'MAX_IMAGE_LENGTH',        -1  );


/**
 * Not yet used
 */

define ( 'DEFAULT_DB_ENGINE',  'MyISAM'  );

/**
 * SSL redirection policies
 */

define ( 'SSL_POLICY_NONE',         0 );
define ( 'SSL_POLICY_FULL',         1 );
define ( 'SSL_POLICY_SELFSIGN',     2 );


/**
 * log levels
 */

define ( 'LOGGER_NORMAL',          0 );
define ( 'LOGGER_TRACE',           1 );
define ( 'LOGGER_DEBUG',           2 );
define ( 'LOGGER_DATA',            3 );
define ( 'LOGGER_ALL',             4 );

/**
 * cache levels
 */

define ( 'CACHE_MONTH',            0 );
define ( 'CACHE_WEEK',             1 );
define ( 'CACHE_DAY',              2 );
define ( 'CACHE_HOUR',             3 );

/**
 * registration policies
 */

define ( 'REGISTER_CLOSED',        0 );
define ( 'REGISTER_APPROVE',       1 );
define ( 'REGISTER_OPEN',          2 );

/**
 * relationship types
 */

define ( 'CONTACT_IS_FOLLOWER', 1);
define ( 'CONTACT_IS_SHARING',  2);
define ( 'CONTACT_IS_FRIEND',   3);


/**
 * DB update return values
 */

define ( 'UPDATE_SUCCESS', 0);
define ( 'UPDATE_FAILED',  1);


/**
 *
 * page/profile types
 *
 * PAGE_NORMAL is a typical personal profile account
 * PAGE_SOAPBOX automatically approves all friend requests as CONTACT_IS_SHARING, (readonly)
 * PAGE_COMMUNITY automatically approves all friend requests as CONTACT_IS_SHARING, but with
 *      write access to wall and comments (no email and not included in page owner's ACL lists)
 * PAGE_FREELOVE automatically approves all friend requests as full friends (CONTACT_IS_FRIEND).
 *
 */

define ( 'PAGE_NORMAL',            0 );
define ( 'PAGE_SOAPBOX',           1 );
define ( 'PAGE_COMMUNITY',         2 );
define ( 'PAGE_FREELOVE',          3 );
define ( 'PAGE_BLOG',              4 );
define ( 'PAGE_PRVGROUP',          5 );

// Type of the community page
define ( 'CP_NO_COMMUNITY_PAGE',   -1 );
define ( 'CP_USERS_ON_SERVER',     0 );
define ( 'CP_GLOBAL_COMMUNITY',    1 );

/**
 * Network and protocol family types
 */

define ( 'NETWORK_DFRN',             'dfrn');    // Friendica, Mistpark, other DFRN implementations
define ( 'NETWORK_ZOT',              'zot!');    // Zot!
define ( 'NETWORK_OSTATUS',          'stat');    // status.net, identi.ca, GNU-social, other OStatus implementations
define ( 'NETWORK_FEED',             'feed');    // RSS/Atom feeds with no known "post/notify" protocol
define ( 'NETWORK_DIASPORA',         'dspr');    // Diaspora
define ( 'NETWORK_MAIL',             'mail');    // IMAP/POP
define ( 'NETWORK_MAIL2',            'mai2');    // extended IMAP/POP
define ( 'NETWORK_FACEBOOK',         'face');    // Facebook API
define ( 'NETWORK_LINKEDIN',         'lnkd');    // LinkedIn
define ( 'NETWORK_XMPP',             'xmpp');    // XMPP
define ( 'NETWORK_MYSPACE',          'mysp');    // MySpace
define ( 'NETWORK_GPLUS',            'goog');    // Google+
define ( 'NETWORK_PUMPIO',           'pump');    // pump.io
define ( 'NETWORK_TWITTER',          'twit');    // Twitter
define ( 'NETWORK_DIASPORA2',        'dspc');    // Diaspora connector
define ( 'NETWORK_STATUSNET',        'stac');    // Statusnet connector
define ( 'NETWORK_APPNET',           'apdn');    // app.net
define ( 'NETWORK_NEWS',             'nntp');    // Network News Transfer Protocol
define ( 'NETWORK_ICALENDAR',        'ical');    // iCalendar
define ( 'NETWORK_PHANTOM',          'unkn');    // Place holder

/**
 * These numbers are used in stored permissions
 * and existing allocations MUST NEVER BE CHANGED
 * OR RE-ASSIGNED! You may only add to them.
 */

$netgroup_ids = array(
	NETWORK_DFRN     => (-1),
	NETWORK_ZOT      => (-2),
	NETWORK_OSTATUS  => (-3),
	NETWORK_FEED     => (-4),
	NETWORK_DIASPORA => (-5),
	NETWORK_MAIL     => (-6),
	NETWORK_MAIL2    => (-7),
	NETWORK_FACEBOOK => (-8),
	NETWORK_LINKEDIN => (-9),
	NETWORK_XMPP     => (-10),
	NETWORK_MYSPACE  => (-11),
	NETWORK_GPLUS    => (-12),
	NETWORK_PUMPIO   => (-13),
	NETWORK_TWITTER  => (-14),
	NETWORK_DIASPORA2 => (-15),
	NETWORK_STATUSNET => (-16),
	NETWORK_APPNET    => (-17),
	NETWORK_NEWS      => (-18),
	NETWORK_ICALENDAR => (-19),

	NETWORK_PHANTOM  => (-127),
);


/**
 * Maximum number of "people who like (or don't like) this"  that we will list by name
 */

define ( 'MAX_LIKERS',    75);

/**
 * Communication timeout
 */

define ( 'ZCURL_TIMEOUT' , (-1));


/**
 * email notification options
 */

define ( 'NOTIFY_INTRO',    0x0001 );
define ( 'NOTIFY_CONFIRM',  0x0002 );
define ( 'NOTIFY_WALL',     0x0004 );
define ( 'NOTIFY_COMMENT',  0x0008 );
define ( 'NOTIFY_MAIL',     0x0010 );
define ( 'NOTIFY_SUGGEST',  0x0020 );
define ( 'NOTIFY_PROFILE',  0x0040 );
define ( 'NOTIFY_TAGSELF',  0x0080 );
define ( 'NOTIFY_TAGSHARE', 0x0100 );
define ( 'NOTIFY_POKE',     0x0200 );
define ( 'NOTIFY_SHARE',    0x0400 );

define ( 'NOTIFY_SYSTEM',   0x8000 );


/**
 * Tag/term types
 */

define ( 'TERM_UNKNOWN',   0 );
define ( 'TERM_HASHTAG',   1 );
define ( 'TERM_MENTION',   2 );
define ( 'TERM_CATEGORY',  3 );
define ( 'TERM_PCATEGORY', 4 );
define ( 'TERM_FILE',      5 );
define ( 'TERM_SAVEDSEARCH', 6 );
define ( 'TERM_CONVERSATION', 7 );

define ( 'TERM_OBJ_POST',  1 );
define ( 'TERM_OBJ_PHOTO', 2 );



/**
 * various namespaces we may need to parse
 */

define ( 'NAMESPACE_ZOT',             'http://purl.org/zot' );
define ( 'NAMESPACE_DFRN' ,           'http://purl.org/macgirvin/dfrn/1.0' );
define ( 'NAMESPACE_THREAD' ,         'http://purl.org/syndication/thread/1.0' );
define ( 'NAMESPACE_TOMB' ,           'http://purl.org/atompub/tombstones/1.0' );
define ( 'NAMESPACE_ACTIVITY',        'http://activitystrea.ms/spec/1.0/' );
define ( 'NAMESPACE_ACTIVITY_SCHEMA', 'http://activitystrea.ms/schema/1.0/' );
define ( 'NAMESPACE_MEDIA',           'http://purl.org/syndication/atommedia' );
define ( 'NAMESPACE_SALMON_ME',       'http://salmon-protocol.org/ns/magic-env' );
define ( 'NAMESPACE_OSTATUSSUB',      'http://ostatus.org/schema/1.0/subscribe' );
define ( 'NAMESPACE_GEORSS',          'http://www.georss.org/georss' );
define ( 'NAMESPACE_POCO',            'http://portablecontacts.net/spec/1.0' );
define ( 'NAMESPACE_FEED',            'http://schemas.google.com/g/2010#updates-from' );
define ( 'NAMESPACE_OSTATUS',         'http://ostatus.org/schema/1.0' );
define ( 'NAMESPACE_STATUSNET',       'http://status.net/schema/api/1/' );
define ( 'NAMESPACE_ATOM1',           'http://www.w3.org/2005/Atom' );
/**
 * activity stream defines
 */

define ( 'ACTIVITY_LIKE',        NAMESPACE_ACTIVITY_SCHEMA . 'like' );
define ( 'ACTIVITY_DISLIKE',     NAMESPACE_DFRN            . '/dislike' );
define ( 'ACTIVITY_ATTEND',      NAMESPACE_ZOT             . '/activity/attendyes' );
define ( 'ACTIVITY_ATTENDNO',    NAMESPACE_ZOT             . '/activity/attendno' );
define ( 'ACTIVITY_ATTENDMAYBE', NAMESPACE_ZOT             . '/activity/attendmaybe' );

define ( 'ACTIVITY_OBJ_HEART',   NAMESPACE_DFRN            . '/heart' );

define ( 'ACTIVITY_FRIEND',      NAMESPACE_ACTIVITY_SCHEMA . 'make-friend' );
define ( 'ACTIVITY_REQ_FRIEND',  NAMESPACE_ACTIVITY_SCHEMA . 'request-friend' );
define ( 'ACTIVITY_UNFRIEND',    NAMESPACE_ACTIVITY_SCHEMA . 'remove-friend' );
define ( 'ACTIVITY_FOLLOW',      NAMESPACE_ACTIVITY_SCHEMA . 'follow' );
define ( 'ACTIVITY_UNFOLLOW',    NAMESPACE_ACTIVITY_SCHEMA . 'stop-following' );
define ( 'ACTIVITY_JOIN',        NAMESPACE_ACTIVITY_SCHEMA . 'join' );

define ( 'ACTIVITY_POST',        NAMESPACE_ACTIVITY_SCHEMA . 'post' );
define ( 'ACTIVITY_UPDATE',      NAMESPACE_ACTIVITY_SCHEMA . 'update' );
define ( 'ACTIVITY_TAG',         NAMESPACE_ACTIVITY_SCHEMA . 'tag' );
define ( 'ACTIVITY_FAVORITE',    NAMESPACE_ACTIVITY_SCHEMA . 'favorite' );
define ( 'ACTIVITY_SHARE',       NAMESPACE_ACTIVITY_SCHEMA . 'share' );

define ( 'ACTIVITY_POKE',        NAMESPACE_ZOT . '/activity/poke' );
define ( 'ACTIVITY_MOOD',        NAMESPACE_ZOT . '/activity/mood' );

define ( 'ACTIVITY_OBJ_BOOKMARK', NAMESPACE_ACTIVITY_SCHEMA . 'bookmark' );
define ( 'ACTIVITY_OBJ_COMMENT', NAMESPACE_ACTIVITY_SCHEMA . 'comment' );
define ( 'ACTIVITY_OBJ_NOTE',    NAMESPACE_ACTIVITY_SCHEMA . 'note' );
define ( 'ACTIVITY_OBJ_PERSON',  NAMESPACE_ACTIVITY_SCHEMA . 'person' );
define ( 'ACTIVITY_OBJ_IMAGE',   NAMESPACE_ACTIVITY_SCHEMA . 'image' );
define ( 'ACTIVITY_OBJ_PHOTO',   NAMESPACE_ACTIVITY_SCHEMA . 'photo' );
define ( 'ACTIVITY_OBJ_VIDEO',   NAMESPACE_ACTIVITY_SCHEMA . 'video' );
define ( 'ACTIVITY_OBJ_P_PHOTO', NAMESPACE_ACTIVITY_SCHEMA . 'profile-photo' );
define ( 'ACTIVITY_OBJ_ALBUM',   NAMESPACE_ACTIVITY_SCHEMA . 'photo-album' );
define ( 'ACTIVITY_OBJ_EVENT',   NAMESPACE_ACTIVITY_SCHEMA . 'event' );
define ( 'ACTIVITY_OBJ_GROUP',   NAMESPACE_ACTIVITY_SCHEMA . 'group' );
define ( 'ACTIVITY_OBJ_TAGTERM', NAMESPACE_DFRN            . '/tagterm' );
define ( 'ACTIVITY_OBJ_PROFILE', NAMESPACE_DFRN            . '/profile' );
define ( 'ACTIVITY_OBJ_QUESTION', 'http://activityschema.org/object/question' );

/**
 * item weight for query ordering
 */

define ( 'GRAVITY_PARENT',       0);
define ( 'GRAVITY_LIKE',         3);
define ( 'GRAVITY_COMMENT',      6);

/**
 *
 * Reverse the effect of magic_quotes_gpc if it is enabled.
 * Please disable magic_quotes_gpc so we don't have to do this.
 * See http://php.net/manual/en/security.magicquotes.disabling.php
 *
 */

function startup() {

	error_reporting(E_ERROR | E_WARNING | E_PARSE);

	set_time_limit(0);

	// This has to be quite large to deal with embedded private photos
	ini_set('pcre.backtrack_limit', 500000);


	if (get_magic_quotes_gpc()) {
		$process = array(&$_GET, &$_POST, &$_COOKIE, &$_REQUEST);
		while (list($key, $val) = each($process)) {
			foreach ($val as $k => $v) {
				unset($process[$key][$k]);
				if (is_array($v)) {
					$process[$key][stripslashes($k)] = $v;
					$process[] = &$process[$key][stripslashes($k)];
				} else {
					$process[$key][stripslashes($k)] = stripslashes($v);
				}
			}
		}
		unset($process);
	}

}

/**
 *
 * class: App
 *
 * Our main application structure for the life of this page
 * Primarily deals with the URL that got us here
 * and tries to make some sense of it, and
 * stores our page contents and config storage
 * and anything else that might need to be passed around
 * before we spit the page out.
 *
 */

if(! class_exists('App')) {
	class App {

		public  $module_loaded = false;
		public  $query_string;
		public  $config;
		public  $page;
		public  $profile;
		public  $profile_uid;
		public  $user;
		public  $cid;
		public  $contact;
		public  $contacts;
		public  $page_contact;
		public  $content;
		public  $data = array();
		public  $error = false;
		public  $cmd;
		public  $argv;
		public  $argc;
		public  $module;
		public  $pager;
		public  $strings;
		public  $path;
		public  $hooks;
		public  $timezone;
		public  $interactive = true;
		public  $plugins;
		public  $apps = array();
		public  $identities;
		public	$is_mobile;
		public	$is_tablet;
		public	$is_friendica_app;
		public	$performance = array();

		public $nav_sel;

		public $category;


		// Allow themes to control internal parameters
		// by changing App values in theme.php

		public	$sourcename = '';
		public	$videowidth = 425;
		public	$videoheight = 350;
		public	$force_max_items = 0;
		public	$theme_thread_allow = true;
		public	$theme_events_in_profile = true;

		// An array for all theme-controllable parameters
		// Mostly unimplemented yet. Only options 'stylesheet' and
		// beyond are used.

		public	$theme = array(
			'sourcename' => '',
			'videowidth' => 425,
			'videoheight' => 350,
			'force_max_items' => 0,
			'thread_allow' => true,
			'stylesheet' => '',
			'template_engine' => 'smarty3',
		);

		// array of registered template engines ('name'=>'class name')
		public $template_engines = array();
		// array of instanced template engines ('name'=>'instance')
		public $template_engine_instance = array();

		private $ldelim = array(
			'internal' => '',
			'smarty3' => '{{'
		);
		private $rdelim = array(
			'internal' => '',
			'smarty3' => '}}'
		);

		private $scheme;
		private $hostname;
		private $baseurl;
		private $db;

		private $curl_code;
		private $curl_content_type;
		private $curl_headers;

		private $cached_profile_image;
		private $cached_profile_picdate;

		function __construct() {

			global $default_timezone;

			$hostname = "";

			if (file_exists(".htpreconfig.php"))
				@include(".htpreconfig.php");

			$this->timezone = ((x($default_timezone)) ? $default_timezone : 'UTC');

			date_default_timezone_set($this->timezone);

			$this->performance["start"] = microtime(true);
			$this->performance["database"] = 0;
			$this->performance["network"] = 0;
			$this->performance["file"] = 0;
			$this->performance["rendering"] = 0;
			$this->performance["parser"] = 0;
			$this->performance["marktime"] = 0;
			$this->performance["markstart"] = microtime(true);

			$this->config = array();
			$this->page = array();
			$this->pager= array();

			$this->query_string = '';

			startup();

			set_include_path(
					'include' . PATH_SEPARATOR
					. 'library' . PATH_SEPARATOR
					. 'library/phpsec' . PATH_SEPARATOR
					. 'library/langdet' . PATH_SEPARATOR
					. '.' );


			$this->scheme = 'http';
			if(x($_SERVER,'HTTPS') && $_SERVER['HTTPS'])
				$this->scheme = 'https';
			elseif(x($_SERVER,'SERVER_PORT') && (intval($_SERVER['SERVER_PORT']) == 443))
				$this->scheme = 'https';

			if(x($_SERVER,'SERVER_NAME')) {
				$this->hostname = $_SERVER['SERVER_NAME'];

				// See bug 437 - this didn't work so disabling it
				//if(stristr($this->hostname,'xn--')) {
					// PHP or webserver may have converted idn to punycode, so
					// convert punycode back to utf-8
				//	require_once('library/simplepie/idn/idna_convert.class.php');
				//	$x = new idna_convert();
				//	$this->hostname = $x->decode($_SERVER['SERVER_NAME']);
				//}

				if(x($_SERVER,'SERVER_PORT') && $_SERVER['SERVER_PORT'] != 80 && $_SERVER['SERVER_PORT'] != 443)
					$this->hostname .= ':' . $_SERVER['SERVER_PORT'];
				/**
				 * Figure out if we are running at the top of a domain
				 * or in a sub-directory and adjust accordingly
				 */

				$path = trim(dirname($_SERVER['SCRIPT_NAME']),'/\\');
				if(isset($path) && strlen($path) && ($path != $this->path))
					$this->path = $path;
			}

			if ($hostname != "")
				$this->hostname = $hostname;

			if (is_array($_SERVER["argv"]) && $_SERVER["argc"]>1 && substr(end($_SERVER["argv"]), 0, 4)=="http" ) {
				$this->set_baseurl(array_pop($_SERVER["argv"]) );
				$_SERVER["argc"] --;
			}

			#set_include_path("include/$this->hostname" . PATH_SEPARATOR . get_include_path());

			if((x($_SERVER,'QUERY_STRING')) && substr($_SERVER['QUERY_STRING'],0,9) === "pagename=") {
				$this->query_string = substr($_SERVER['QUERY_STRING'],9);
				// removing trailing / - maybe a nginx problem
				if (substr($this->query_string, 0, 1) == "/")
					$this->query_string = substr($this->query_string, 1);
			} elseif((x($_SERVER,'QUERY_STRING')) && substr($_SERVER['QUERY_STRING'],0,2) === "q=") {
				$this->query_string = substr($_SERVER['QUERY_STRING'],2);
				// removing trailing / - maybe a nginx problem
				if (substr($this->query_string, 0, 1) == "/")
					$this->query_string = substr($this->query_string, 1);
			}

			if (x($_GET,'pagename'))
				$this->cmd = trim($_GET['pagename'],'/\\');
			elseif (x($_GET,'q'))
				$this->cmd = trim($_GET['q'],'/\\');


			// fix query_string
			$this->query_string = str_replace($this->cmd."&",$this->cmd."?", $this->query_string);


			// unix style "homedir"

			if(substr($this->cmd,0,1) === '~')
				$this->cmd = 'profile/' . substr($this->cmd,1);

			// Diaspora style profile url

			if(substr($this->cmd,0,2) === 'u/')
				$this->cmd = 'profile/' . substr($this->cmd,2);


			/**
			 *
			 * Break the URL path into C style argc/argv style arguments for our
			 * modules. Given "http://example.com/module/arg1/arg2", $this->argc
			 * will be 3 (integer) and $this->argv will contain:
			 *   [0] => 'module'
			 *   [1] => 'arg1'
			 *   [2] => 'arg2'
			 *
			 *
			 * There will always be one argument. If provided a naked domain
			 * URL, $this->argv[0] is set to "home".
			 *
			 */

			$this->argv = explode('/',$this->cmd);
			$this->argc = count($this->argv);
			if((array_key_exists('0',$this->argv)) && strlen($this->argv[0])) {
				$this->module = str_replace(".", "_", $this->argv[0]);
				$this->module = str_replace("-", "_", $this->module);
			}
			else {
				$this->argc = 1;
				$this->argv = array('home');
				$this->module = 'home';
			}

			/**
			 * See if there is any page number information, and initialise
			 * pagination
			 */

			$this->pager['page'] = ((x($_GET,'page') && intval($_GET['page']) > 0) ? intval($_GET['page']) : 1);
			$this->pager['itemspage'] = 50;
			$this->pager['start'] = ($this->pager['page'] * $this->pager['itemspage']) - $this->pager['itemspage'];
			if($this->pager['start'] < 0)
				$this->pager['start'] = 0;
			$this->pager['total'] = 0;

			/**
			 * Detect mobile devices
			 */

			$mobile_detect = new Mobile_Detect();
			$this->is_mobile = $mobile_detect->isMobile();
			$this->is_tablet = $mobile_detect->isTablet();

			// Friendica-Client
			$this->is_friendica_app = ($_SERVER['HTTP_USER_AGENT'] == "Apache-HttpClient/UNAVAILABLE (java 1.4)");

			/**
			 * register template engines
			 */
			$dc = get_declared_classes();
			foreach ($dc as $k) {
				if (in_array("ITemplateEngine", class_implements($k))){
					$this->register_template_engine($k);
				}
			}

		}

		function get_basepath() {

			$basepath = get_config("system", "basepath");

			if ($basepath == "")
				$basepath = $_SERVER["DOCUMENT_ROOT"];

			if ($basepath == "")
				$basepath = $_SERVER["PWD"];

			return($basepath);
		}

		function get_scheme() {
			return($this->scheme);
		}

		function get_baseurl($ssl = false) {

			$scheme = $this->scheme;

			if((x($this->config,'system')) && (x($this->config['system'],'ssl_policy'))) {
				if(intval($this->config['system']['ssl_policy']) === intval(SSL_POLICY_FULL))
					$scheme = 'https';

				//	Basically, we have $ssl = true on any links which can only be seen by a logged in user
				//	(and also the login link). Anything seen by an outsider will have it turned off.

				if($this->config['system']['ssl_policy'] == SSL_POLICY_SELFSIGN) {
					if($ssl)
						$scheme = 'https';
					else
						$scheme = 'http';
				}
			}

			if (get_config('config','hostname') != "")
				$this->hostname = get_config('config','hostname');

			$this->baseurl = $scheme . "://" . $this->hostname . ((isset($this->path) && strlen($this->path)) ? '/' . $this->path : '' );
			return $this->baseurl;
		}

		function set_baseurl($url) {
			$parsed = @parse_url($url);

			$this->baseurl = $url;

			if($parsed) {
				$this->scheme = $parsed['scheme'];

				$hostname = $parsed['host'];
				if(x($parsed,'port'))
					$hostname .= ':' . $parsed['port'];
				if(x($parsed,'path'))
					$this->path = trim($parsed['path'],'\\/');

				if (file_exists(".htpreconfig.php"))
					@include(".htpreconfig.php");

				if (get_config('config','hostname') != "")
					$this->hostname = get_config('config','hostname');

				if (!isset($this->hostname) OR ($this->hostname == ""))
					$this->hostname = $hostname;
			}

		}

		function get_hostname() {
			if (get_config('config','hostname') != "")
				$this->hostname = get_config('config','hostname');

			return $this->hostname;
		}

		function set_hostname($h) {
			$this->hostname = $h;
		}

		function set_path($p) {
			$this->path = trim(trim($p),'/');
		}

		function get_path() {
			return $this->path;
		}

		function set_pager_total($n) {
			$this->pager['total'] = intval($n);
		}

		function set_pager_itemspage($n) {
			$this->pager['itemspage'] = ((intval($n) > 0) ? intval($n) : 0);
			$this->pager['start'] = ($this->pager['page'] * $this->pager['itemspage']) - $this->pager['itemspage'];
		}

		function set_pager_page($n) {
			$this->pager['page'] = $n;
			$this->pager['start'] = ($this->pager['page'] * $this->pager['itemspage']) - $this->pager['itemspage'];
		}

		function init_pagehead() {
			$interval = ((local_user()) ? get_pconfig(local_user(),'system','update_interval') : 40000);
			if($interval < 10000)
				$interval = 40000;

			$this->page['title'] = $this->config['sitename'];

			/* put the head template at the beginning of page['htmlhead']
			 * since the code added by the modules frequently depends on it
			 * being first
			 */
			if(!isset($this->page['htmlhead']))
				$this->page['htmlhead'] = '';

			// If we're using Smarty, then doing replace_macros() will replace
			// any unrecognized variables with a blank string. Since we delay
			// replacing $stylesheet until later, we need to replace it now
			// with another variable name
			if($this->theme['template_engine'] === 'smarty3')
				$stylesheet = $this->get_template_ldelim('smarty3') . '$stylesheet' . $this->get_template_rdelim('smarty3');
			else
				$stylesheet = '$stylesheet';

			$shortcut_icon = get_config("system", "shortcut_icon");
			if ($shortcut_icon == "")
				$shortcut_icon = $this->get_baseurl()."/images/friendica-32.png";

			$touch_icon = get_config("system", "touch_icon");
			if ($touch_icon == "")
				$touch_icon = $this->get_baseurl()."/images/friendica-128.png";

			$tpl = get_markup_template('head.tpl');
			$this->page['htmlhead'] = replace_macros($tpl,array(
				'$baseurl' => $this->get_baseurl(), // FIXME for z_path!!!!
				'$local_user' => local_user(),
				'$generator' => 'Friendica' . ' ' . FRIENDICA_VERSION,
				'$delitem' => t('Delete this item?'),
				'$comment' => t('Comment'),
				'$showmore' => t('show more'),
				'$showfewer' => t('show fewer'),
				'$update_interval' => $interval,
				'$shortcut_icon' => $shortcut_icon,
				'$touch_icon' => $touch_icon,
				'$stylesheet' => $stylesheet
			)) . $this->page['htmlhead'];
		}

		function init_page_end() {
			if(!isset($this->page['end']))
				$this->page['end'] = '';
			$tpl = get_markup_template('end.tpl');
			$this->page['end'] = replace_macros($tpl,array(
				'$baseurl' => $this->get_baseurl() // FIXME for z_path!!!!
			)) . $this->page['end'];
		}

		function set_curl_code($code) {
			$this->curl_code = $code;
		}

		function get_curl_code() {
			return $this->curl_code;
		}

		function set_curl_content_type($content_type) {
			$this->curl_content_type = $content_type;
		}

		function get_curl_content_type() {
			return $this->curl_content_type;
		}

		function set_curl_headers($headers) {
			$this->curl_headers = $headers;
		}

		function get_curl_headers() {
			return $this->curl_headers;
		}

		function get_cached_avatar_image($avatar_image){
			if($this->cached_profile_image[$avatar_image])
				return $this->cached_profile_image[$avatar_image];

			$path_parts = explode("/",$avatar_image);
			$common_filename = $path_parts[count($path_parts)-1];

			if($this->cached_profile_picdate[$common_filename]){
				$this->cached_profile_image[$avatar_image] = $avatar_image . $this->cached_profile_picdate[$common_filename];
			} else {
				$r = q("SELECT `contact`.`avatar-date` AS picdate FROM `contact` WHERE `contact`.`thumb` like '%%/%s'",
					$common_filename);
				if(! count($r)){
					$this->cached_profile_image[$avatar_image] = $avatar_image;
				} else {
					$this->cached_profile_picdate[$common_filename] = "?rev=".urlencode($r[0]['picdate']);
					$this->cached_profile_image[$avatar_image] = $avatar_image.$this->cached_profile_picdate[$common_filename];
				}
			}
			return $this->cached_profile_image[$avatar_image];
		}


		/**
		 * register template engine class
		 * if $name is "", is used class static property $class::$name
		 * @param string $class
		 * @param string $name
		 */
		function register_template_engine($class, $name = '') {
			if ($name===""){
				$v = get_class_vars( $class );
				if(x($v,"name")) $name = $v['name'];
			}
			if ($name===""){
				echo "template engine <tt>$class</tt> cannot be registered without a name.\n";
				killme();
			}
			$this->template_engines[$name] = $class;
		}

		/**
		 * return template engine instance. If $name is not defined,
		 * return engine defined by theme, or default
		 *
		 * @param strin $name Template engine name
		 * @return object Template Engine instance
		 */
		function template_engine($name = ''){
			if ($name!=="") {
				$template_engine = $name;
			} else {
				$template_engine = 'smarty3';
				if (x($this->theme, 'template_engine')) {
					$template_engine = $this->theme['template_engine'];
				}
			}

			if (isset($this->template_engines[$template_engine])){
				if(isset($this->template_engine_instance[$template_engine])){
					return $this->template_engine_instance[$template_engine];
				} else {
					$class = $this->template_engines[$template_engine];
					$obj = new $class;
					$this->template_engine_instance[$template_engine] = $obj;
					return $obj;
				}
			}

			echo "template engine <tt>$template_engine</tt> is not registered!\n"; killme();
		}

		function get_template_engine() {
			return $this->theme['template_engine'];
		}

		function set_template_engine($engine = 'smarty3') {
			$this->theme['template_engine'] = $engine;
			/*
			$this->theme['template_engine'] = 'smarty3';

			switch($engine) {
				case 'smarty3':
					if(is_writable('view/smarty3/'))
						$this->theme['template_engine'] = 'smarty3';
					break;
				default:
					break;
			}
			*/
		}

		function get_template_ldelim($engine = 'smarty3') {
			return $this->ldelim[$engine];
		}

		function get_template_rdelim($engine = 'smarty3') {
			return $this->rdelim[$engine];
		}

		function save_timestamp($stamp, $value) {
			$duration = (float)(microtime(true)-$stamp);

			$this->performance[$value] += (float)$duration;
			$this->performance["marktime"] += (float)$duration;
		}

		function mark_timestamp($mark) {
			//$this->performance["markstart"] -= microtime(true) - $this->performance["marktime"];
			$this->performance["markstart"] = microtime(true) - $this->performance["markstart"] - $this->performance["marktime"];
		}

		function get_useragent() {
			return(FRIENDICA_PLATFORM." '".FRIENDICA_CODENAME."' ".FRIENDICA_VERSION."-".DB_UPDATE_VERSION."; ".$this->get_baseurl());
		}

		function is_friendica_app() {
			return($this->is_friendica_app);
		}

	}
}

// retrieve the App structure
// useful in functions which require it but don't get it passed to them

if(! function_exists('get_app')) {
	function get_app() {
		global $a;
		return $a;
	}
};


// Multi-purpose function to check variable state.
// Usage: x($var) or $x($array,'key')
// returns false if variable/key is not set
// if variable is set, returns 1 if has 'non-zero' value, otherwise returns 0.
// e.g. x('') or x(0) returns 0;

if(! function_exists('x')) {
	function x($s,$k = NULL) {
		if($k != NULL) {
			if((is_array($s)) && (array_key_exists($k,$s))) {
				if($s[$k])
					return (int) 1;
				return (int) 0;
		}
			return false;
		}
		else {
			if(isset($s)) {
				if($s) {
					return (int) 1;
				}
				return (int) 0;
			}
			return false;
		}
	}
}

// called from db initialisation if db is dead.

if(! function_exists('system_unavailable')) {
	function system_unavailable() {
		include('system_unavailable.php');
		system_down();
		killme();
	}
}



function clean_urls() {
	global $a;
	//	if($a->config['system']['clean_urls'])
	return true;
	//	return false;
}

function z_path() {
	global $a;
	$base = $a->get_baseurl();
	if(! clean_urls())
		$base .= '/?q=';
	return $base;
}

function z_root() {
	global $a;
	return $a->get_baseurl();
}

function absurl($path) {
	if(strpos($path,'/') === 0)
		return z_path() . $path;
	return $path;
}

function is_ajax() {
	return (!empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest');
}

function check_db() {

	$build = get_config('system','build');
	if(! x($build)) {
		set_config('system','build',DB_UPDATE_VERSION);
		$build = DB_UPDATE_VERSION;
	}
	if($build != DB_UPDATE_VERSION)
		proc_run('php', 'include/dbupdate.php');

}




// Sets the base url for use in cmdline programs which don't have
// $_SERVER variables

if(! function_exists('check_url')) {
	function check_url(&$a) {

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

		// if the url isn't set or the stored url is radically different
		// than the currently visited url, store the current value accordingly.
		// "Radically different" ignores common variations such as http vs https
		// and www.example.com vs example.com.
		// We will only change the url to an ip address if there is no existing setting

		if(! x($url))
			$url = set_config('system','url',$a->get_baseurl());
		if((! link_compare($url,$a->get_baseurl())) && (! preg_match("/^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/",$a->get_hostname)))
			$url = set_config('system','url',$a->get_baseurl());

		return;
	}
}


// Automatic database updates

if(! function_exists('update_db')) {
	function update_db(&$a) {
		$build = get_config('system','build');
		if(! x($build))
			$build = set_config('system','build',DB_UPDATE_VERSION);

		if($build != DB_UPDATE_VERSION) {
			$stored = intval($build);
			$current = intval(DB_UPDATE_VERSION);
			if($stored < $current) {
				load_config('database');

				// We're reporting a different version than what is currently installed.
				// Run any existing update scripts to bring the database up to current.

				// make sure that boot.php and update.php are the same release, we might be
				// updating right this very second and the correct version of the update.php
				// file may not be here yet. This can happen on a very busy site.

				if(DB_UPDATE_VERSION == UPDATE_VERSION) {
					// Compare the current structure with the defined structure

					$t = get_config('database','dbupdate_'.DB_UPDATE_VERSION);
					if($t !== false)
						return;

					set_config('database','dbupdate_'.DB_UPDATE_VERSION, time());

					// run old update routine (wich could modify the schema and
					// conflits with new routine)
					for ($x = $stored; $x < NEW_UPDATE_ROUTINE_VERSION; $x++) {
						$r = run_update_function($x);
						if (!$r) break;
					}
					if ($stored < NEW_UPDATE_ROUTINE_VERSION) $stored = NEW_UPDATE_ROUTINE_VERSION;


					// run new update routine
					// it update the structure in one call
					$retval = update_structure(false, true);
					if($retval) {
						update_fail(
							DB_UPDATE_VERSION,
							$retval
						);
						return;
					} else {
						set_config('database','dbupdate_'.DB_UPDATE_VERSION, 'success');
					}

					// run any left update_nnnn functions in update.php
					for($x = $stored; $x < $current; $x ++) {
						$r = run_update_function($x);
						if (!$r) break;
					}
				}
			}
		}

		return;
	}
}
if(!function_exists('run_update_function')){
	function run_update_function($x) {
		if(function_exists('update_' . $x)) {

			// There could be a lot of processes running or about to run.
			// We want exactly one process to run the update command.
			// So store the fact that we're taking responsibility
			// after first checking to see if somebody else already has.

			// If the update fails or times-out completely you may need to
			// delete the config entry to try again.

			$t = get_config('database','update_' . $x);
			if($t !== false)
				return false;
			set_config('database','update_' . $x, time());

			// call the specific update

			$func = 'update_' . $x;
			$retval = $func();

			if($retval) {
				//send the administrator an e-mail
				update_fail(
					$x,
					sprintf(t('Update %s failed. See error logs.'), $x)
				);
				return false;
			} else {
				set_config('database','update_' . $x, 'success');
				set_config('system','build', $x + 1);
				return true;
			}
		} else {
			set_config('database','update_' . $x, 'success');
			set_config('system','build', $x + 1);
			return true;
		}
		return true;
	}
}


if(! function_exists('check_plugins')) {
	function check_plugins(&$a) {

		/**
		 *
		 * Synchronise plugins:
		 *
		 * $a->config['system']['addon'] contains a comma-separated list of names
		 * of plugins/addons which are used on this system.
		 * Go through the database list of already installed addons, and if we have
		 * an entry, but it isn't in the config list, call the uninstall procedure
		 * and mark it uninstalled in the database (for now we'll remove it).
		 * Then go through the config list and if we have a plugin that isn't installed,
		 * call the install procedure and add it to the database.
		 *
		 */

		$r = q("SELECT * FROM `addon` WHERE `installed` = 1");
		if(count($r))
			$installed = $r;
		else
			$installed = array();

		$plugins = get_config('system','addon');
		$plugins_arr = array();

		if($plugins)
			$plugins_arr = explode(',',str_replace(' ', '',$plugins));

		$a->plugins = $plugins_arr;

		$installed_arr = array();

		if(count($installed)) {
			foreach($installed as $i) {
				if(! in_array($i['name'],$plugins_arr)) {
					uninstall_plugin($i['name']);
				}
				else {
					$installed_arr[] = $i['name'];
				}
			}
		}

		if(count($plugins_arr)) {
			foreach($plugins_arr as $p) {
				if(! in_array($p,$installed_arr)) {
					install_plugin($p);
				}
			}
		}


		load_hooks();

		return;
	}
}

function get_guid($size=16, $prefix = "") {

	if ($prefix == "") {
		$a = get_app();
		$prefix = hash("crc32", $a->get_hostname());
	}

	while (strlen($prefix) < ($size - 13))
		$prefix .= mt_rand();

	if ($size >= 24) {
		$prefix = substr($prefix, 0, $size - 22);
		return(str_replace(".", "", uniqid($prefix, true)));
	} else {
		$prefix = substr($prefix, 0, $size - 13);
		return(uniqid($prefix));
	}
}

// wrapper for adding a login box. If $register == true provide a registration
// link. This will most always depend on the value of $a->config['register_policy'].
// returns the complete html for inserting into the page

if(! function_exists('login')) {
	function login($register = false, $hiddens=false) {
		$a = get_app();
		$o = "";
		$reg = false;
		if ($register) {
			$reg = array(
				'title' => t('Create a New Account'),
				'desc' => t('Register')
			);
		}

		$noid = get_config('system','no_openid');

		$dest_url = $a->get_baseurl(true) . '/' . $a->query_string;

		if(local_user()) {
			$tpl = get_markup_template("logout.tpl");
		}
		else {
			$a->page['htmlhead'] .= replace_macros(get_markup_template("login_head.tpl"),array(
				'$baseurl'		=> $a->get_baseurl(true)
			));

			$tpl = get_markup_template("login.tpl");
			$_SESSION['return_url'] = $a->query_string;
			$a->module = 'login';
		}

		$o .= replace_macros($tpl, array(

			'$dest_url'     => $dest_url,
			'$logout'       => t('Logout'),
			'$login'        => t('Login'),

			'$lname'	 	=> array('username', t('Nickname or Email address: ') , '', ''),
			'$lpassword' 	=> array('password', t('Password: '), '', ''),
			'$lremember'	=> array('remember', t('Remember me'), 0,  ''),

			'$openid'		=> !$noid,
			'$lopenid'      => array('openid_url', t('Or login using OpenID: '),'',''),

			'$hiddens'      => $hiddens,

			'$register'     => $reg,

			'$lostpass'     => t('Forgot your password?'),
			'$lostlink'     => t('Password Reset'),

			'$tostitle'	=> t('Website Terms of Service'),
			'$toslink'	=> t('terms of service'),

			'$privacytitle'	=> t('Website Privacy Policy'),
			'$privacylink'	=> t('privacy policy'),

		));

		call_hooks('login_hook',$o);

		return $o;
	}
}

// Used to end the current process, after saving session state.

if(! function_exists('killme')) {
	function killme() {
		session_write_close();
		exit;
	}
}

// redirect to another URL and terminate this process.

if(! function_exists('goaway')) {
	function goaway($s) {
		header("Location: $s");
		killme();
	}
}


// Returns the uid of locally logged in user or false.

if(! function_exists('local_user')) {
	function local_user() {
		if((x($_SESSION,'authenticated')) && (x($_SESSION,'uid')))
			return intval($_SESSION['uid']);
		return false;
	}
}

// Returns contact id of authenticated site visitor or false

if(! function_exists('remote_user')) {
	function remote_user() {
		if((x($_SESSION,'authenticated')) && (x($_SESSION,'visitor_id')))
			return intval($_SESSION['visitor_id']);
		return false;
	}
}

// contents of $s are displayed prominently on the page the next time
// a page is loaded. Usually used for errors or alerts.

if(! function_exists('notice')) {
	/**
	 * Show an error message to user.
	 *
	 * This function save text in session, to be shown to the user at next page load
	 *
	 * @param string $s - Text of notice
	 */
	function notice($s) {
		$a = get_app();
		if(! x($_SESSION,'sysmsg'))	$_SESSION['sysmsg'] = array();
		if($a->interactive)
			$_SESSION['sysmsg'][] = $s;
	}
}
if(! function_exists('info')) {
	/**
	 * Show an info message to user.
	 *
	 * This function save text in session, to be shown to the user at next page load
	 *
	 * @param string $s - Text of notice
	 */
	function info($s) {
		$a = get_app();

		if (local_user() AND get_pconfig(local_user(),'system','ignore_info'))
			return;

		if(! x($_SESSION,'sysmsg_info')) $_SESSION['sysmsg_info'] = array();
		if($a->interactive)
			$_SESSION['sysmsg_info'][] = $s;
	}
}


// wrapper around config to limit the text length of an incoming message

if(! function_exists('get_max_import_size')) {
	function get_max_import_size() {
		global $a;
		return ((x($a->config,'max_import_size')) ? $a->config['max_import_size'] : 0 );
	}
}

/**
 *
 * Wrap calls to proc_close(proc_open()) and call hook
 * so plugins can take part in process :)
 *
 * args:
 * $cmd program to run
 *  next args are passed as $cmd command line
 *
 * e.g.: proc_run("ls","-la","/tmp");
 *
 * $cmd and string args are surrounded with ""
 */

if(! function_exists('proc_run')) {
	function proc_run($cmd){

		$a = get_app();

		$args = func_get_args();

		$newargs = array();
		if(! count($args))
			return;

		// expand any arrays

		foreach($args as $arg) {
			if(is_array($arg)) {
				foreach($arg as $n) {
					$newargs[] = $n;
				}
			}
			else
				$newargs[] = $arg;
		}

		$args = $newargs;

		$arr = array('args' => $args, 'run_cmd' => true);

		call_hooks("proc_run", $arr);
		if(! $arr['run_cmd'])
			return;

		if(count($args) && $args[0] === 'php') {

			if (get_config("system", "worker")) {
				$argv = $args;
				array_shift($argv);

				$parameters = json_encode($argv);
				$found = q("SELECT `id` FROM `workerqueue` WHERE `parameter` = '%s'",
						dbesc($parameters));

				if (!$found)
					q("INSERT INTO `workerqueue` (`parameter`, `created`, `priority`)
								VALUES ('%s', '%s', %d)",
						dbesc($parameters),
						dbesc(datetime_convert()),
						intval(0));

				// Should we quit and wait for the poller to be called as a cronjob?
				if (get_config("system", "worker_dont_fork"))
					return;

				// Checking number of workers
				$workers = q("SELECT COUNT(*) AS `workers` FROM `workerqueue` WHERE `executed` != '0000-00-00 00:00:00'");

				// Get number of allowed number of worker threads
				$queues = intval(get_config("system", "worker_queues"));

				if ($queues == 0)
					$queues = 4;

				// If there are already enough workers running, don't fork another one
				if ($workers[0]["workers"] >= $queues)
					return;

				// Now call the poller to execute the jobs that we just added to the queue
				$args = array("php", "include/poller.php", "no_cron");
			}

			$args[0] = ((x($a->config,'php_path')) && (strlen($a->config['php_path'])) ? $a->config['php_path'] : 'php');
		}

		// add baseurl to args. cli scripts can't construct it
		$args[] = $a->get_baseurl();

		for($x = 0; $x < count($args); $x ++)
			$args[$x] = escapeshellarg($args[$x]);

		$cmdline = implode($args," ");

		if(get_config('system','proc_windows'))
			proc_close(proc_open('cmd /c start /b ' . $cmdline,array(),$foo,dirname(__FILE__)));
		else
			proc_close(proc_open($cmdline." &",array(),$foo,dirname(__FILE__)));
	}
}

if(! function_exists('current_theme')) {
	function current_theme(){
		$app_base_themes = array('duepuntozero', 'dispy', 'quattro');

		$a = get_app();

		$page_theme = null;

		// Find the theme that belongs to the user whose stuff we are looking at

		if($a->profile_uid && ($a->profile_uid != local_user())) {
			$r = q("select theme from user where uid = %d limit 1",
				intval($a->profile_uid)
			);
			if($r)
				$page_theme = $r[0]['theme'];
		}

		// Allow folks to over-rule user themes and always use their own on their own site.
		// This works only if the user is on the same server

		if($page_theme && local_user() && (local_user() != $a->profile_uid)) {
			if(get_pconfig(local_user(),'system','always_my_theme'))
				$page_theme = null;
		}

//		$mobile_detect = new Mobile_Detect();
//		$is_mobile = $mobile_detect->isMobile() || $mobile_detect->isTablet();
		$is_mobile = $a->is_mobile || $a->is_tablet;

		$standard_system_theme = ((isset($a->config['system']['theme'])) ? $a->config['system']['theme'] : '');
		$standard_theme_name = ((isset($_SESSION) && x($_SESSION,'theme')) ? $_SESSION['theme'] : $standard_system_theme);

		if($is_mobile) {
			if(isset($_SESSION['show-mobile']) && !$_SESSION['show-mobile']) {
				$system_theme = $standard_system_theme;
				$theme_name = $standard_theme_name;
			}
			else {
				$system_theme = ((isset($a->config['system']['mobile-theme'])) ? $a->config['system']['mobile-theme'] : $standard_system_theme);
				$theme_name = ((isset($_SESSION) && x($_SESSION,'mobile-theme')) ? $_SESSION['mobile-theme'] : $system_theme);

				if($theme_name === '---') {
					// user has selected to have the mobile theme be the same as the normal one
					$system_theme = $standard_system_theme;
					$theme_name = $standard_theme_name;

					if($page_theme)
						$theme_name = $page_theme;
				}
			}
		}
		else {
			$system_theme = $standard_system_theme;
			$theme_name = $standard_theme_name;

			if($page_theme)
				$theme_name = $page_theme;
		}

		if($theme_name &&
				(file_exists('view/theme/' . $theme_name . '/style.css') ||
						file_exists('view/theme/' . $theme_name . '/style.php')))
			return($theme_name);

		foreach($app_base_themes as $t) {
			if(file_exists('view/theme/' . $t . '/style.css')||
					file_exists('view/theme/' . $t . '/style.php'))
				return($t);
		}

		$fallback = array_merge(glob('view/theme/*/style.css'),glob('view/theme/*/style.php'));
		if(count($fallback))
			return (str_replace('view/theme/','', substr($fallback[0],0,-10)));

	}
}

/*
 * Return full URL to theme which is currently in effect.
* Provide a sane default if nothing is chosen or the specified theme does not exist.
*/
if(! function_exists('current_theme_url')) {
	function current_theme_url() {
		global $a;

		$t = current_theme();

		$opts = (($a->profile_uid) ? '?f=&puid=' . $a->profile_uid : '');
		if (file_exists('view/theme/' . $t . '/style.php'))
			return($a->get_baseurl() . '/view/theme/' . $t . '/style.pcss' . $opts);

		return($a->get_baseurl() . '/view/theme/' . $t . '/style.css');
	}
}

if(! function_exists('feed_birthday')) {
	function feed_birthday($uid,$tz) {

		/**
		 *
		 * Determine the next birthday, but only if the birthday is published
		 * in the default profile. We _could_ also look for a private profile that the
		 * recipient can see, but somebody could get mad at us if they start getting
		 * public birthday greetings when they haven't made this info public.
		 *
		 * Assuming we are able to publish this info, we are then going to convert
		 * the start time from the owner's timezone to UTC.
		 *
		 * This will potentially solve the problem found with some social networks
		 * where birthdays are converted to the viewer's timezone and salutations from
		 * elsewhere in the world show up on the wrong day. We will convert it to the
		 * viewer's timezone also, but first we are going to convert it from the birthday
		 * person's timezone to GMT - so the viewer may find the birthday starting at
		 * 6:00PM the day before, but that will correspond to midnight to the birthday person.
		 *
		 */


		$birthday = '';

		if(! strlen($tz))
			$tz = 'UTC';

		$p = q("SELECT `dob` FROM `profile` WHERE `is-default` = 1 AND `uid` = %d LIMIT 1",
				intval($uid)
		);

		if($p && count($p)) {
			$tmp_dob = substr($p[0]['dob'],5);
			if(intval($tmp_dob)) {
				$y = datetime_convert($tz,$tz,'now','Y');
				$bd = $y . '-' . $tmp_dob . ' 00:00';
				$t_dob = strtotime($bd);
				$now = strtotime(datetime_convert($tz,$tz,'now'));
				if($t_dob < $now)
					$bd = $y + 1 . '-' . $tmp_dob . ' 00:00';
				$birthday = datetime_convert($tz,'UTC',$bd,ATOM_TIME);
			}
		}

		return $birthday;
	}
}

if(! function_exists('is_site_admin')) {
	function is_site_admin() {
		$a = get_app();

		$adminlist = explode(",", str_replace(" ", "", $a->config['admin_email']));

		//if(local_user() && x($a->user,'email') && x($a->config,'admin_email') && ($a->user['email'] === $a->config['admin_email']))
		if(local_user() && x($a->user,'email') && x($a->config,'admin_email') && in_array($a->user['email'], $adminlist))
			return true;
		return false;
	}
}


if(! function_exists('load_contact_links')) {
	function load_contact_links($uid) {

		$a = get_app();

		$ret = array();

		if(! $uid || x($a->contacts,'empty'))
			return;

		$r = q("SELECT `id`,`network`,`url`,`thumb`, `rel` FROM `contact` WHERE `uid` = %d AND `self` = 0 AND `blocked` = 0 AND `thumb` != ''",
				intval($uid)
		);
		if(count($r)) {
			foreach($r as $rr){
				$url = normalise_link($rr['url']);
				$ret[$url] = $rr;
			}
		} else
			$ret['empty'] = true;

		$a->contacts = $ret;
		return;
	}
}

/**
* returns querystring as string from a mapped array
*
* @param params Array
* @return string
*/
function build_querystring($params, $name=null) {
	$ret = "";
	foreach($params as $key=>$val) {
		if(is_array($val)) {
			if($name==null) {
				$ret .= build_querystring($val, $key);
			} else {
				$ret .= build_querystring($val, $name."[$key]");
			}
		} else {
			$val = urlencode($val);
			if($name!=null) {
				$ret.=$name."[$key]"."=$val&";
			} else {
				$ret.= "$key=$val&";
			}
		}
	}
	return $ret;
}

function explode_querystring($query) {
	$arg_st = strpos($query, '?');
	if($arg_st !== false) {
		$base = substr($query, 0, $arg_st);
		$arg_st += 1;
	} else {
		$base = '';
		$arg_st = 0;
	}

	$args = explode('&', substr($query, $arg_st));
	foreach($args as $k=>$arg) {
		if($arg === '')
			unset($args[$k]);
	}
	$args = array_values($args);

	if(!$base) {
		$base = $args[0];
		unset($args[0]);
		$args = array_values($args);
	}

	return array(
		'base' => $base,
		'args' => $args,
	);
}

/**
* Returns the complete URL of the current page, e.g.: http(s)://something.com/network
*
* Taken from http://webcheatsheet.com/php/get_current_page_url.php
*/
function curPageURL() {
	$pageURL = 'http';
	if ($_SERVER["HTTPS"] == "on") {$pageURL .= "s";}
	$pageURL .= "://";
	if ($_SERVER["SERVER_PORT"] != "80" && $_SERVER["SERVER_PORT"] != "443") {
		$pageURL .= $_SERVER["SERVER_NAME"].":".$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
	} else {
		$pageURL .= $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"];
	}
	return $pageURL;
}

function random_digits($digits) {
	$rn = '';
	for($i = 0; $i < $digits; $i++) {
		$rn .= rand(0,9);
	}
	return $rn;
}

function get_server() {
	$server = get_config("system", "directory");

	if ($server == "")
		$server = "http://dir.friendi.ca";

	return($server);
}

function get_cachefile($file, $writemode = true) {
	$cache = get_itemcachepath();

	if ((! $cache) || (! is_dir($cache)))
		return("");

	$subfolder = $cache."/".substr($file, 0, 2);

	$cachepath = $subfolder."/".$file;

	if ($writemode) {
		if (!is_dir($subfolder)) {
			mkdir($subfolder);
			chmod($subfolder, 0777);
		}
	}

	return($cachepath);
}

function clear_cache($basepath = "", $path = "") {
	if ($path == "") {
		$basepath = get_itemcachepath();
		$path = $basepath;
	}

	if (($path == "") OR (!is_dir($path)))
		return;

	if (substr(realpath($path), 0, strlen($basepath)) != $basepath)
		return;

	$cachetime = (int)get_config('system','itemcache_duration');
	if ($cachetime == 0)
		$cachetime = 86400;

	if (is_writable($path)){
		if ($dh = opendir($path)) {
			while (($file = readdir($dh)) !== false) {
				$fullpath = $path."/".$file;
				if ((filetype($fullpath) == "dir") and ($file != ".") and ($file != ".."))
					clear_cache($basepath, $fullpath);
				if ((filetype($fullpath) == "file") and (filectime($fullpath) < (time() - $cachetime)))
					unlink($fullpath);
			}
			closedir($dh);
		}
	}
}

function get_itemcachepath() {
	// Checking, if the cache is deactivated
	$cachetime = (int)get_config('system','itemcache_duration');
	if ($cachetime < 0)
		return "";

	$itemcache = get_config('system','itemcache');
	if (($itemcache != "") AND is_dir($itemcache) AND is_writable($itemcache))
		return($itemcache);

	$temppath = get_temppath();

	if ($temppath != "") {
		$itemcache = $temppath."/itemcache";
		if(!file_exists($itemcache) && !is_dir($itemcache)) {
			mkdir($itemcache);
		}

		if (is_dir($itemcache) AND is_writable($itemcache)) {
			set_config("system", "itemcache", $itemcache);
			return($itemcache);
		}
	}
	return "";
}

function get_lockpath() {
	$lockpath = get_config('system','lockpath');
	if (($lockpath != "") AND is_dir($lockpath) AND is_writable($lockpath))
		return($lockpath);

	$temppath = get_temppath();

	if ($temppath != "") {
		$lockpath = $temppath."/lock";

		if (!is_dir($lockpath))
			mkdir($lockpath);
		elseif (!is_writable($lockpath))
			$lockpath = $temppath;

		if (is_dir($lockpath) AND is_writable($lockpath)) {
			set_config("system", "lockpath", $lockpath);
			return($lockpath);
		}
	}
	return "";
}

function get_temppath() {
	$a = get_app();

	$temppath = get_config("system","temppath");
	if (($temppath != "") AND is_dir($temppath) AND is_writable($temppath))
		return($temppath);

	$temppath = sys_get_temp_dir();
	if (($temppath != "") AND is_dir($temppath) AND is_writable($temppath)) {
		$temppath .= "/".$a->get_hostname();
		if (!is_dir($temppath))
			mkdir($temppath);

		if (is_dir($temppath) AND is_writable($temppath)) {
			set_config("system", "temppath", $temppath);
			return($temppath);
		}
	}

	return("");
}

function set_template_engine(&$a, $engine = 'internal') {
// This function is no longer necessary, but keep it as a wrapper to the class method
// to avoid breaking themes again unnecessarily

	$a->set_template_engine($engine);
}

if(!function_exists('exif_imagetype')) {
	function exif_imagetype($file) {
		$size = getimagesize($file);
		return($size[2]);
	}
}

function validate_include(&$file) {
	$orig_file = $file;

	$file = realpath($file);

	if (strpos($file, getcwd()) !== 0)
		return false;

	$file = str_replace(getcwd()."/", "", $file, $count);
	if ($count != 1)
		return false;

	if ($orig_file !== $file)
		return false;

	$valid = false;
	if (strpos($file, "include/") === 0)
		$valid = true;

	if (strpos($file, "addon/") === 0)
		$valid = true;

	if (!$valid)
		return false;

	return true;
}