[tt-rss.git] / include / functions.php

<?php
	define('EXPECTED_CONFIG_VERSION', 26);
	define('SCHEMA_VERSION', 103);

	$fetch_last_error = false;
	$pluginhost = false;

	function __autoload($class) {
		$class_file = str_replace("_", "/", strtolower(basename($class)));

		$file = dirname(__FILE__)."/../classes/$class_file.php";

		if (file_exists($file)) {
			require $file;
		}

	}

	mb_internal_encoding("UTF-8");
	date_default_timezone_set('UTC');
	if (defined('E_DEPRECATED')) {
		error_reporting(E_ALL & ~E_NOTICE & ~E_DEPRECATED);
	} else {
		error_reporting(E_ALL & ~E_NOTICE);
	}

	require_once 'config.php';

	if (DB_TYPE == "pgsql") {
		define('SUBSTRING_FOR_DATE', 'SUBSTRING_FOR_DATE');
	} else {
		define('SUBSTRING_FOR_DATE', 'SUBSTRING');
	}

	define('THEME_VERSION_REQUIRED', 1.1);

	/**
	 * Return available translations names.
	 *
	 * @access public
	 * @return array A array of available translations.
	 */
	function get_translations() {
		$tr = array(
					"auto"  => "Detect automatically",
					"ca_CA" => "Català",
					"en_US" => "English",
					"es_ES" => "Español",
					"de_DE" => "Deutsch",
					"fr_FR" => "Français",
					"hu_HU" => "Magyar (Hungarian)",
					"it_IT" => "Italiano",
					"ja_JP" => "日本語 (Japanese)",
					"nb_NO" => "Norwegian bokmål",
					"pl_PL" => "Polski",
					"ru_RU" => "Русский",
					"pt_BR" => "Portuguese/Brazil",
					"zh_CN" => "Simplified Chinese");

		return $tr;
	}

	require_once "lib/accept-to-gettext.php";
	require_once "lib/gettext/gettext.inc";


	function startup_gettext() {

		# Get locale from Accept-Language header
		$lang = al2gt(array_keys(get_translations()), "text/html");

		if (defined('_TRANSLATION_OVERRIDE_DEFAULT')) {
			$lang = _TRANSLATION_OVERRIDE_DEFAULT;
		}

		/* In login action of mobile version */
		if ($_POST["language"] && defined('MOBILE_VERSION')) {
			$lang = $_POST["language"];
		} else if ($_SESSION["language"] && $_SESSION["language"] != "auto") {
			$lang = $_SESSION["language"];
		}

		if ($lang) {
			if (defined('LC_MESSAGES')) {
				_setlocale(LC_MESSAGES, $lang);
			} else if (defined('LC_ALL')) {
				_setlocale(LC_ALL, $lang);
			}

			if (defined('MOBILE_VERSION')) {
				_bindtextdomain("messages", "../locale");
			} else {
				_bindtextdomain("messages", "locale");
			}

			_textdomain("messages");
			_bind_textdomain_codeset("messages", "UTF-8");
		}
	}

	startup_gettext();

	require_once 'db-prefs.php';
	require_once 'version.php';
	require_once 'ccache.php';
	require_once 'labels.php';

	define('SELF_USER_AGENT', 'Tiny Tiny RSS/' . VERSION . ' (http://tt-rss.org/)');
	ini_set('user_agent', SELF_USER_AGENT);

	require_once 'lib/pubsubhubbub/publisher.php';
	require_once 'lib/htmLawed.php';

	$tz_offset = -1;
	$utc_tz = new DateTimeZone('UTC');
	$schema_version = false;

	/**
	 * Print a timestamped debug message.
	 *
	 * @param string $msg The debug message.
	 * @return void
	 */
	function _debug($msg) {
		if (defined('QUIET') && QUIET) {
			return;
		}
		$ts = strftime("%H:%M:%S", time());
		if (function_exists('posix_getpid')) {
			$ts = "$ts/" . posix_getpid();
		}
		print "[$ts] $msg\n";
	} // function _debug

	/**
	 * Purge a feed old posts.
	 *
	 * @param mixed $link A database connection.
	 * @param mixed $feed_id The id of the purged feed.
	 * @param mixed $purge_interval Olderness of purged posts.
	 * @param boolean $debug Set to True to enable the debug. False by default.
	 * @access public
	 * @return void
	 */
	function purge_feed($link, $feed_id, $purge_interval, $debug = false) {

		if (!$purge_interval) $purge_interval = feed_purge_interval($link, $feed_id);

		$rows = -1;

		$result = db_query($link,
			"SELECT owner_uid FROM ttrss_feeds WHERE id = '$feed_id'");

		$owner_uid = false;

		if (db_num_rows($result) == 1) {
			$owner_uid = db_fetch_result($result, 0, "owner_uid");
		}

		if ($purge_interval == -1 || !$purge_interval) {
			if ($owner_uid) {
				ccache_update($link, $feed_id, $owner_uid);
			}
			return;
		}

		if (!$owner_uid) return;

		if (FORCE_ARTICLE_PURGE == 0) {
			$purge_unread = get_pref($link, "PURGE_UNREAD_ARTICLES",
				$owner_uid, false);
		} else {
			$purge_unread = true;
			$purge_interval = FORCE_ARTICLE_PURGE;
		}

		if (!$purge_unread) $query_limit = " unread = false AND ";

		if (DB_TYPE == "pgsql") {
			$pg_version = get_pgsql_version($link);

			if (preg_match("/^7\./", $pg_version) || preg_match("/^8\.0/", $pg_version)) {

				$result = db_query($link, "DELETE FROM ttrss_user_entries WHERE
					ttrss_entries.id = ref_id AND
					marked = false AND
					feed_id = '$feed_id' AND
					$query_limit
					ttrss_entries.date_updated < NOW() - INTERVAL '$purge_interval days'");

			} else {

				$result = db_query($link, "DELETE FROM ttrss_user_entries
					USING ttrss_entries
					WHERE ttrss_entries.id = ref_id AND
					marked = false AND
					feed_id = '$feed_id' AND
					$query_limit
					ttrss_entries.date_updated < NOW() - INTERVAL '$purge_interval days'");
			}

			$rows = pg_affected_rows($result);

		} else {

/*			$result = db_query($link, "DELETE FROM ttrss_user_entries WHERE
				marked = false AND feed_id = '$feed_id' AND
				(SELECT date_updated FROM ttrss_entries WHERE
					id = ref_id) < DATE_SUB(NOW(), INTERVAL $purge_interval DAY)"); */

			$result = db_query($link, "DELETE FROM ttrss_user_entries
				USING ttrss_user_entries, ttrss_entries
				WHERE ttrss_entries.id = ref_id AND
				marked = false AND
				feed_id = '$feed_id' AND
				$query_limit
				ttrss_entries.date_updated < DATE_SUB(NOW(), INTERVAL $purge_interval DAY)");

			$rows = mysql_affected_rows($link);

		}

		ccache_update($link, $feed_id, $owner_uid);

		if ($debug) {
			_debug("Purged feed $feed_id ($purge_interval): deleted $rows articles");
		}
	} // function purge_feed

	function feed_purge_interval($link, $feed_id) {

		$result = db_query($link, "SELECT purge_interval, owner_uid FROM ttrss_feeds
			WHERE id = '$feed_id'");

		if (db_num_rows($result) == 1) {
			$purge_interval = db_fetch_result($result, 0, "purge_interval");
			$owner_uid = db_fetch_result($result, 0, "owner_uid");

			if ($purge_interval == 0) $purge_interval = get_pref($link,
				'PURGE_OLD_DAYS', $owner_uid);

			return $purge_interval;

		} else {
			return -1;
		}
	}

	function purge_orphans($link, $do_output = false) {

		// purge orphaned posts in main content table
		$result = db_query($link, "DELETE FROM ttrss_entries WHERE
			(SELECT COUNT(int_id) FROM ttrss_user_entries WHERE ref_id = id) = 0");

		if ($do_output) {
			$rows = db_affected_rows($link, $result);
			_debug("Purged $rows orphaned posts.");
		}
	}

	function get_feed_update_interval($link, $feed_id) {
		$result = db_query($link, "SELECT owner_uid, update_interval FROM
			ttrss_feeds WHERE id = '$feed_id'");

		if (db_num_rows($result) == 1) {
			$update_interval = db_fetch_result($result, 0, "update_interval");
			$owner_uid = db_fetch_result($result, 0, "owner_uid");

			if ($update_interval != 0) {
				return $update_interval;
			} else {
				return get_pref($link, 'DEFAULT_UPDATE_INTERVAL', $owner_uid, false);
			}

		} else {
			return -1;
		}
	}

	function fetch_file_contents($url, $type = false, $login = false, $pass = false, $post_query = false, $timeout = false) {
		$login = urlencode($login);
		$pass = urlencode($pass);

		global $fetch_last_error;

		if (function_exists('curl_init') && !ini_get("open_basedir")) {
			$ch = curl_init($url);

			curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout ? $timeout : 15);
			curl_setopt($ch, CURLOPT_TIMEOUT, $timeout ? $timeout : 45);
			curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
			curl_setopt($ch, CURLOPT_MAXREDIRS, 20);
			curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);
			curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
			curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
			curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
			curl_setopt($ch, CURLOPT_USERAGENT, SELF_USER_AGENT);
			curl_setopt($ch, CURLOPT_ENCODING , "gzip");
			curl_setopt($fp, CURLOPT_REFERER, $url);

			if ($post_query) {
				curl_setopt($ch, CURLOPT_POST, true);
				curl_setopt($ch, CURLOPT_POSTFIELDS, $post_query);
			}

			if ($login && $pass)
				curl_setopt($ch, CURLOPT_USERPWD, "$login:$pass");

			$contents = @curl_exec($ch);

			if (curl_errno($fp) === 23 || curl_errno($fp) === 61) {
				curl_setopt($fp, CURLOPT_ENCODING, 'none');
				$contents = @curl_exec($fp);
			}

			if ($contents === false) {
				$fetch_last_error = curl_errno($ch) . " " . curl_error($ch);
				curl_close($ch);
				return false;
			}

			$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
			$content_type = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);

			if ($http_code != 200 || $type && strpos($content_type, "$type") === false) {
				if (curl_errno($ch) != 0) {
					$fetch_last_error = curl_errno($ch) . " " . curl_error($ch);
				} else {
					$fetch_last_error = "HTTP Code: $http_code";
				}
				curl_close($ch);
				return false;
			}

			curl_close($ch);

			return $contents;
		} else {
			if ($login && $pass ){
				$url_parts = array();

				preg_match("/(^[^:]*):\/\/(.*)/", $url, $url_parts);

				if ($url_parts[1] && $url_parts[2]) {
					$url = $url_parts[1] . "://$login:$pass@" . $url_parts[2];
				}
			}

			$data = @file_get_contents($url);

			if (!$data && function_exists('error_get_last')) {
				$error = error_get_last();
				$fetch_last_error = $error["message"];
			}
			return $data;
		}

	}

	/**
	 * Try to determine the favicon URL for a feed.
	 * adapted from wordpress favicon plugin by Jeff Minard (http://thecodepro.com/)
	 * http://dev.wp-plugins.org/file/favatars/trunk/favatars.php
	 *
	 * @param string $url A feed or page URL
	 * @access public
	 * @return mixed The favicon URL, or false if none was found.
	 */
	function get_favicon_url($url) {

		$favicon_url = false;

		if ($html = @fetch_file_contents($url)) {

			libxml_use_internal_errors(true);

			$doc = new DOMDocument();
			$doc->loadHTML($html);
			$xpath = new DOMXPath($doc);

			$base = $xpath->query('/html/head/base');
			foreach ($base as $b) {
				$url = $b->getAttribute("href");
				break;
			}

			$entries = $xpath->query('/html/head/link[@rel="shortcut icon" or @rel="icon"]');
			if (count($entries) > 0) {
				foreach ($entries as $entry) {
					$favicon_url = rewrite_relative_url($url, $entry->getAttribute("href"));
					break;
				}
			}
		}

		if (!$favicon_url)
			$favicon_url = rewrite_relative_url($url, "/favicon.ico");

		return $favicon_url;
	} // function get_favicon_url

	function check_feed_favicon($site_url, $feed, $link) {
#		print "FAVICON [$site_url]: $favicon_url\n";

		$icon_file = ICONS_DIR . "/$feed.ico";

		if (!file_exists($icon_file)) {
			$favicon_url = get_favicon_url($site_url);

			if ($favicon_url) {
				// Limiting to "image" type misses those served with text/plain
				$contents = fetch_file_contents($favicon_url); // , "image");

				if ($contents) {
					// Crude image type matching.
					// Patterns gleaned from the file(1) source code.
					if (preg_match('/^\x00\x00\x01\x00/', $contents)) {
						// 0       string  \000\000\001\000        MS Windows icon resource
						//error_log("check_feed_favicon: favicon_url=$favicon_url isa MS Windows icon resource");
					}
					elseif (preg_match('/^GIF8/', $contents)) {
						// 0       string          GIF8            GIF image data
						//error_log("check_feed_favicon: favicon_url=$favicon_url isa GIF image");
					}
					elseif (preg_match('/^\x89PNG\x0d\x0a\x1a\x0a/', $contents)) {
						// 0       string          \x89PNG\x0d\x0a\x1a\x0a         PNG image data
						//error_log("check_feed_favicon: favicon_url=$favicon_url isa PNG image");
					}
					elseif (preg_match('/^\xff\xd8/', $contents)) {
						// 0       beshort         0xffd8          JPEG image data
						//error_log("check_feed_favicon: favicon_url=$favicon_url isa JPG image");
					}
					else {
						//error_log("check_feed_favicon: favicon_url=$favicon_url isa UNKNOWN type");
						$contents = "";
					}
				}

				if ($contents) {
					$fp = @fopen($icon_file, "w");

					if ($fp) {
						fwrite($fp, $contents);
						fclose($fp);
						chmod($icon_file, 0644);
					}
				}
			}
		}
	}

	function print_select($id, $default, $values, $attributes = "") {
		print "<select name=\"$id\" id=\"$id\" $attributes>";
		foreach ($values as $v) {
			if ($v == $default)
				$sel = "selected=\"1\"";
			 else
			 	$sel = "";

			print "<option value=\"$v\" $sel>$v</option>";
		}
		print "</select>";
	}

	function print_select_hash($id, $default, $values, $attributes = "") {
		print "<select name=\"$id\" id='$id' $attributes>";
		foreach (array_keys($values) as $v) {
			if ($v == $default)
				$sel = 'selected="selected"';
			 else
			 	$sel = "";

			print "<option $sel value=\"$v\">".$values[$v]."</option>";
		}

		print "</select>";
	}

	function getmicrotime() {
		list($usec, $sec) = explode(" ",microtime());
		return ((float)$usec + (float)$sec);
	}

	function print_radio($id, $default, $true_is, $values, $attributes = "") {
		foreach ($values as $v) {

			if ($v == $default)
				$sel = "checked";
			 else
			 	$sel = "";

			if ($v == $true_is) {
				$sel .= " value=\"1\"";
			} else {
				$sel .= " value=\"0\"";
			}

			print "<input class=\"noborder\" dojoType=\"dijit.form.RadioButton\"
				type=\"radio\" $sel $attributes name=\"$id\">&nbsp;$v&nbsp;";

		}
	}

	function initialize_user_prefs($link, $uid, $profile = false) {

		$uid = db_escape_string($uid);

		if (!$profile) {
			$profile = "NULL";
			$profile_qpart = "AND profile IS NULL";
		} else {
			$profile_qpart = "AND profile = '$profile'";
		}

		if (get_schema_version($link) < 63) $profile_qpart = "";

		db_query($link, "BEGIN");

		$result = db_query($link, "SELECT pref_name,def_value FROM ttrss_prefs");

		$u_result = db_query($link, "SELECT pref_name
			FROM ttrss_user_prefs WHERE owner_uid = '$uid' $profile_qpart");

		$active_prefs = array();

		while ($line = db_fetch_assoc($u_result)) {
			array_push($active_prefs, $line["pref_name"]);
		}

		while ($line = db_fetch_assoc($result)) {
			if (array_search($line["pref_name"], $active_prefs) === FALSE) {
//				print "adding " . $line["pref_name"] . "<br>";

				if (get_schema_version($link) < 63) {
					db_query($link, "INSERT INTO ttrss_user_prefs
						(owner_uid,pref_name,value) VALUES
						('$uid', '".$line["pref_name"]."','".$line["def_value"]."')");

				} else {
					db_query($link, "INSERT INTO ttrss_user_prefs
						(owner_uid,pref_name,value, profile) VALUES
						('$uid', '".$line["pref_name"]."','".$line["def_value"]."', $profile)");
				}

			}
		}

		db_query($link, "COMMIT");

	}

	function get_ssl_certificate_id() {
		if ($_SERVER["REDIRECT_SSL_CLIENT_M_SERIAL"]) {
			return sha1($_SERVER["REDIRECT_SSL_CLIENT_M_SERIAL"] .
				$_SERVER["REDIRECT_SSL_CLIENT_V_START"] .
				$_SERVER["REDIRECT_SSL_CLIENT_V_END"] .
				$_SERVER["REDIRECT_SSL_CLIENT_S_DN"]);
		}
		return "";
	}

	function authenticate_user($link, $login, $password, $check_only = false) {

		if (!SINGLE_USER_MODE) {

			$user_id = false;

			global $pluginhost;
			foreach ($pluginhost->get_hooks($pluginhost::HOOK_AUTH_USER) as $plugin) {

				$user_id = (int) $plugin->authenticate($login, $password);

				if ($user_id) {
					$_SESSION["auth_module"] = strtolower(get_class($plugin));
					break;
				}
			}

			if ($user_id && !$check_only) {
				$_SESSION["uid"] = $user_id;

				$result = db_query($link, "SELECT login,access_level,pwd_hash FROM ttrss_users
					WHERE id = '$user_id'");

				$_SESSION["name"] = db_fetch_result($result, 0, "login");
				$_SESSION["access_level"] = db_fetch_result($result, 0, "access_level");
				$_SESSION["csrf_token"] = sha1(uniqid(rand(), true));

				db_query($link, "UPDATE ttrss_users SET last_login = NOW() WHERE id = " .
					$_SESSION["uid"]);

				$_SESSION["ip_address"] = $_SERVER["REMOTE_ADDR"];
				$_SESSION["pwd_hash"] = db_fetch_result($result, 0, "pwd_hash");

				$_SESSION["last_version_check"] = time();

				initialize_user_prefs($link, $_SESSION["uid"]);

				return true;
			}

			return false;

		} else {

			$_SESSION["uid"] = 1;
			$_SESSION["name"] = "admin";
			$_SESSION["access_level"] = 10;

			$_SESSION["hide_hello"] = true;
			$_SESSION["hide_logout"] = true;

			$_SESSION["auth_module"] = false;

			if (!$_SESSION["csrf_token"]) {
				$_SESSION["csrf_token"] = sha1(uniqid(rand(), true));
			}

			$_SESSION["ip_address"] = $_SERVER["REMOTE_ADDR"];

			initialize_user_prefs($link, $_SESSION["uid"]);

			return true;
		}
	}

	function make_password($length = 8) {

		$password = "";
		$possible = "0123456789abcdfghjkmnpqrstvwxyzABCDFGHJKMNPQRSTVWXYZ";

   	$i = 0;

		while ($i < $length) {
			$char = substr($possible, mt_rand(0, strlen($possible)-1), 1);

			if (!strstr($password, $char)) {
				$password .= $char;
				$i++;
			}
		}
		return $password;
	}

	// this is called after user is created to initialize default feeds, labels
	// or whatever else

	// user preferences are checked on every login, not here

	function initialize_user($link, $uid) {

		db_query($link, "insert into ttrss_feeds (owner_uid,title,feed_url)
			values ('$uid', 'Tiny Tiny RSS: New Releases',
			'http://tt-rss.org/releases.rss')");

		db_query($link, "insert into ttrss_feeds (owner_uid,title,feed_url)
			values ('$uid', 'Tiny Tiny RSS: Forum',
				'http://tt-rss.org/forum/rss.php')");
	}

	function logout_user() {
		session_destroy();
		if (isset($_COOKIE[session_name()])) {
		   setcookie(session_name(), '', time()-42000, '/');
		}
	}

	function validate_csrf($csrf_token) {
		return $csrf_token == $_SESSION['csrf_token'];
	}

	function validate_session($link) {
		if (SINGLE_USER_MODE) return true;

		$check_ip = $_SESSION['ip_address'];

		switch (SESSION_CHECK_ADDRESS) {
		case 0:
			$check_ip = '';
			break;
		case 1:
			$check_ip = substr($check_ip, 0, strrpos($check_ip, '.')+1);
			break;
		case 2:
			$check_ip = substr($check_ip, 0, strrpos($check_ip, '.'));
			$check_ip = substr($check_ip, 0, strrpos($check_ip, '.')+1);
			break;
		};

		if ($check_ip && strpos($_SERVER['REMOTE_ADDR'], $check_ip) !== 0) {
			$_SESSION["login_error_msg"] =
				__("Session failed to validate (incorrect IP)");
			return false;
		}

		if ($_SESSION["ref_schema_version"] != get_schema_version($link, true))
			return false;

		if ($_SESSION["uid"]) {

			$result = db_query($link,
				"SELECT pwd_hash FROM ttrss_users WHERE id = '".$_SESSION["uid"]."'");

			$pwd_hash = db_fetch_result($result, 0, "pwd_hash");

			if ($pwd_hash != $_SESSION["pwd_hash"]) {
				return false;
			}
		}

/*		if ($_SESSION["cookie_lifetime"] && $_SESSION["uid"]) {

			//print_r($_SESSION);

			if (time() > $_SESSION["cookie_lifetime"]) {
				return false;
			}
		} */

		return true;
	}

	function load_user_plugins($link, $owner_uid) {
		if ($owner_uid) {
			$plugins = get_pref($link, "_ENABLED_PLUGINS", $owner_uid);

			global $pluginhost;
			$pluginhost->load($plugins, $pluginhost::KIND_USER, $owner_uid);

			if (get_schema_version($link) > 100) {
				$pluginhost->load_data();
			}
		}
	}

	function login_sequence($link, $login_form = 0) {
		$_SESSION["prefs_cache"] = false;

		if (SINGLE_USER_MODE) {
			authenticate_user($link, "admin", null);
			load_user_plugins($link, $_SESSION["uid"]);
		} else {
			if (!$_SESSION["uid"] || !validate_session($link)) {

				if (AUTH_AUTO_LOGIN && authenticate_user($link, null, null)) {
				    $_SESSION["ref_schema_version"] = get_schema_version($link, true);
				} else {
					 authenticate_user($link, null, null, true);
				}

				if (!$_SESSION["uid"]) render_login_form($link, $login_form);

			} else {
				/* bump login timestamp */
				db_query($link, "UPDATE ttrss_users SET last_login = NOW() WHERE id = " .
					$_SESSION["uid"]);
			}

			if ($_SESSION["uid"] && $_SESSION["language"] && SESSION_COOKIE_LIFETIME > 0) {
				setcookie("ttrss_lang", $_SESSION["language"],
					time() + SESSION_COOKIE_LIFETIME);
			}

			if ($_SESSION["uid"]) {
				load_user_plugins($link, $_SESSION["uid"]);
			}
		}
	}

	function truncate_string($str, $max_len, $suffix = '&hellip;') {
		if (mb_strlen($str, "utf-8") > $max_len - 3) {
			return mb_substr($str, 0, $max_len, "utf-8") . $suffix;
		} else {
			return $str;
		}
	}

	// Deprecated, TODO: remove
	function theme_image($link, $filename) {
		return $filename;
	}

	function convert_timestamp($timestamp, $source_tz, $dest_tz) {

		try {
			$source_tz = new DateTimeZone($source_tz);
		} catch (Exception $e) {
			$source_tz = new DateTimeZone('UTC');
		}

		try {
			$dest_tz = new DateTimeZone($dest_tz);
		} catch (Exception $e) {
			$dest_tz = new DateTimeZone('UTC');
		}

		$dt = new DateTime(date('Y-m-d H:i:s', $timestamp), $source_tz);
		return $dt->format('U') + $dest_tz->getOffset($dt);
	}

	function make_local_datetime($link, $timestamp, $long, $owner_uid = false,
					$no_smart_dt = false) {

		if (!$owner_uid) $owner_uid = $_SESSION['uid'];
		if (!$timestamp) $timestamp = '1970-01-01 0:00';

		global $utc_tz;
		global $tz_offset;

		# We store date in UTC internally
		$dt = new DateTime($timestamp, $utc_tz);

		if ($tz_offset == -1) {

			$user_tz_string = get_pref($link, 'USER_TIMEZONE', $owner_uid);

			try {
				$user_tz = new DateTimeZone($user_tz_string);
			} catch (Exception $e) {
				$user_tz = $utc_tz;
			}

			$tz_offset = $user_tz->getOffset($dt);
		}

		$user_timestamp = $dt->format('U') + $tz_offset;

		if (!$no_smart_dt) {
			return smart_date_time($link, $user_timestamp,
				$tz_offset, $owner_uid);
		} else {
			if ($long)
				$format = get_pref($link, 'LONG_DATE_FORMAT', $owner_uid);
			else
				$format = get_pref($link, 'SHORT_DATE_FORMAT', $owner_uid);

			return date($format, $user_timestamp);
		}
	}

	function smart_date_time($link, $timestamp, $tz_offset = 0, $owner_uid = false) {
		if (!$owner_uid) $owner_uid = $_SESSION['uid'];

		if (date("Y.m.d", $timestamp) == date("Y.m.d", time() + $tz_offset)) {
			return date("G:i", $timestamp);
		} else if (date("Y", $timestamp) == date("Y", time() + $tz_offset)) {
			$format = get_pref($link, 'SHORT_DATE_FORMAT', $owner_uid);
			return date($format, $timestamp);
		} else {
			$format = get_pref($link, 'LONG_DATE_FORMAT', $owner_uid);
			return date($format, $timestamp);
		}
	}

	function sql_bool_to_bool($s) {
		if ($s == "t" || $s == "1" || $s == "true") {
			return true;
		} else {
			return false;
		}
	}

	function bool_to_sql_bool($s) {
		if ($s) {
			return "true";
		} else {
			return "false";
		}
	}

	// Session caching removed due to causing wrong redirects to upgrade
	// script when get_schema_version() is called on an obsolete session
	// created on a previous schema version.
	function get_schema_version($link, $nocache = false) {
		global $schema_version;

		if (!$schema_version) {
			$result = db_query($link, "SELECT schema_version FROM ttrss_version");
			$version = db_fetch_result($result, 0, "schema_version");
			$schema_version = $version;
			return $version;
		} else {
			return $schema_version;
		}
	}

	function sanity_check($link) {
		require_once 'errors.php';

		$error_code = 0;
		$schema_version = get_schema_version($link, true);

		if ($schema_version != SCHEMA_VERSION) {
			$error_code = 5;
		}

		if (DB_TYPE == "mysql") {
			$result = db_query($link, "SELECT true", false);
			if (db_num_rows($result) != 1) {
				$error_code = 10;
			}
		}

		if (db_escape_string("testTEST") != "testTEST") {
			$error_code = 12;
		}

		return array("code" => $error_code, "message" => $ERRORS[$error_code]);
	}

	function file_is_locked($filename) {
		if (function_exists('flock')) {
			$fp = @fopen(LOCK_DIRECTORY . "/$filename", "r");
			if ($fp) {
				if (flock($fp, LOCK_EX | LOCK_NB)) {
					flock($fp, LOCK_UN);
					fclose($fp);
					return false;
				}
				fclose($fp);
				return true;
			} else {
				return false;
			}
		}
		return true; // consider the file always locked and skip the test
	}

	function make_lockfile($filename) {
		$fp = fopen(LOCK_DIRECTORY . "/$filename", "w");

		if (flock($fp, LOCK_EX | LOCK_NB)) {
			if (function_exists('posix_getpid')) {
				fwrite($fp, posix_getpid() . "\n");
			}
			return $fp;
		} else {
			return false;
		}
	}

	function make_stampfile($filename) {
		$fp = fopen(LOCK_DIRECTORY . "/$filename", "w");

		if (flock($fp, LOCK_EX | LOCK_NB)) {
			fwrite($fp, time() . "\n");
			flock($fp, LOCK_UN);
			fclose($fp);
			return true;
		} else {
			return false;
		}
	}

	function sql_random_function() {
		if (DB_TYPE == "mysql") {
			return "RAND()";
		} else {
			return "RANDOM()";
		}
	}

	function catchup_feed($link, $feed, $cat_view, $owner_uid = false, $max_id = false) {

			if (!$owner_uid) $owner_uid = $_SESSION['uid'];

			//if (preg_match("/^-?[0-9][0-9]*$/", $feed) != false) {

			$ref_check_qpart = ($max_id &&
				!get_pref($link, 'REVERSE_HEADLINES')) ? "ref_id <= '$max_id'" : "true";

			if (is_numeric($feed)) {
				if ($cat_view) {

					if ($feed >= 0) {

						if ($feed > 0) {
							$children = getChildCategories($link, $feed, $owner_uid);
							array_push($children, $feed);

							$children = join(",", $children);

							$cat_qpart = "cat_id IN ($children)";
						} else {
							$cat_qpart = "cat_id IS NULL";
						}

						db_query($link, "UPDATE ttrss_user_entries
							SET unread = false,last_read = NOW()
							WHERE feed_id IN (SELECT id FROM ttrss_feeds WHERE $cat_qpart)
							AND $ref_check_qpart
							AND owner_uid = $owner_uid");

					} else if ($feed == -2) {

						db_query($link, "UPDATE ttrss_user_entries
							SET unread = false,last_read = NOW() WHERE (SELECT COUNT(*)
								FROM ttrss_user_labels2 WHERE article_id = ref_id) > 0
								AND $ref_check_qpart
								AND unread = true AND owner_uid = $owner_uid");
					}

				} else if ($feed > 0) {

					db_query($link, "UPDATE ttrss_user_entries
							SET unread = false,last_read = NOW()
							WHERE feed_id = '$feed'
							AND $ref_check_qpart
							AND owner_uid = $owner_uid");

				} else if ($feed < 0 && $feed > -10) { // special, like starred

					if ($feed == -1) {
						db_query($link, "UPDATE ttrss_user_entries
							SET unread = false,last_read = NOW()
							WHERE marked = true
							AND $ref_check_qpart
							AND owner_uid = $owner_uid");
					}

					if ($feed == -2) {
						db_query($link, "UPDATE ttrss_user_entries
							SET unread = false,last_read = NOW()
							WHERE published = true
							AND $ref_check_qpart
							AND owner_uid = $owner_uid");
					}

					if ($feed == -3) {

						$intl = get_pref($link, "FRESH_ARTICLE_MAX_AGE");

						if (DB_TYPE == "pgsql") {
							$match_part = "updated > NOW() - INTERVAL '$intl hour' ";
						} else {
							$match_part = "updated > DATE_SUB(NOW(),
								INTERVAL $intl HOUR) ";
						}

						$result = db_query($link, "SELECT id FROM ttrss_entries,
							ttrss_user_entries WHERE $match_part AND
							unread = true AND
						  	ttrss_user_entries.ref_id = ttrss_entries.id AND
							owner_uid = $owner_uid");

						$affected_ids = array();

						while ($line = db_fetch_assoc($result)) {
							array_push($affected_ids, $line["id"]);
						}

						catchupArticlesById($link, $affected_ids, 0);
					}

					if ($feed == -4) {
						db_query($link, "UPDATE ttrss_user_entries
							SET unread = false,last_read = NOW()
							WHERE $ref_check_qpart AND owner_uid = $owner_uid");
					}

				} else if ($feed < -10) { // label

					$label_id = -$feed - 11;

					db_query($link, "UPDATE ttrss_user_entries, ttrss_user_labels2
						SET unread = false, last_read = NOW()
							WHERE label_id = '$label_id' AND unread = true
							AND $ref_check_qpart
							AND owner_uid = '$owner_uid' AND ref_id = article_id");

				}

				ccache_update($link, $feed, $owner_uid, $cat_view);

			} else { // tag
				db_query($link, "BEGIN");

				$tag_name = db_escape_string($feed);

				$result = db_query($link, "SELECT post_int_id FROM ttrss_tags
					WHERE tag_name = '$tag_name' AND owner_uid = $owner_uid");

				while ($line = db_fetch_assoc($result)) {
					db_query($link, "UPDATE ttrss_user_entries SET
						unread = false, last_read = NOW()
						WHERE $ref_check_qpart AND int_id = " . $line["post_int_id"]);
				}
				db_query($link, "COMMIT");
			}
	}

	function getAllCounters($link) {
		$data = getGlobalCounters($link);

		$data = array_merge($data, getVirtCounters($link));
		$data = array_merge($data, getLabelCounters($link));
		$data = array_merge($data, getFeedCounters($link, $active_feed));
		$data = array_merge($data, getCategoryCounters($link));

		return $data;
	}

	function getCategoryTitle($link, $cat_id) {

		if ($cat_id == -1) {
			return __("Special");
		} else if ($cat_id == -2) {
			return __("Labels");
		} else {

			$result = db_query($link, "SELECT title FROM ttrss_feed_categories WHERE
				id = '$cat_id'");

			if (db_num_rows($result) == 1) {
				return db_fetch_result($result, 0, "title");
			} else {
				return __("Uncategorized");
			}
		}
	}


	function getCategoryCounters($link) {
		$ret_arr = array();

		/* Labels category */

		$cv = array("id" => -2, "kind" => "cat",
			"counter" => getCategoryUnread($link, -2));

		array_push($ret_arr, $cv);

		$result = db_query($link, "SELECT id AS cat_id, value AS unread,
			(SELECT COUNT(id) FROM ttrss_feed_categories AS c2
				WHERE c2.parent_cat = ttrss_feed_categories.id) AS num_children
			FROM ttrss_feed_categories, ttrss_cat_counters_cache
			WHERE ttrss_cat_counters_cache.feed_id = id AND
			ttrss_cat_counters_cache.owner_uid = ttrss_feed_categories.owner_uid AND
			ttrss_feed_categories.owner_uid = " . $_SESSION["uid"]);

		while ($line = db_fetch_assoc($result)) {
			$line["cat_id"] = (int) $line["cat_id"];

			if ($line["num_children"] > 0) {
				$child_counter = getCategoryChildrenUnread($link, $line["cat_id"], $_SESSION["uid"]);
			} else {
				$child_counter = 0;
			}

			$cv = array("id" => $line["cat_id"], "kind" => "cat",
				"counter" => $line["unread"] + $child_counter);

			array_push($ret_arr, $cv);
		}

		/* Special case: NULL category doesn't actually exist in the DB */

		$cv = array("id" => 0, "kind" => "cat",
			"counter" => (int) ccache_find($link, 0, $_SESSION["uid"], true));

		array_push($ret_arr, $cv);

		return $ret_arr;
	}

	// only accepts real cats (>= 0)
	function getCategoryChildrenUnread($link, $cat, $owner_uid = false) {
		if (!$owner_uid) $owner_uid = $_SESSION["uid"];

		$result = db_query($link, "SELECT id FROM ttrss_feed_categories WHERE parent_cat = '$cat'
				AND owner_uid = $owner_uid");

		$unread = 0;

		while ($line = db_fetch_assoc($result)) {
			$unread += getCategoryUnread($link, $line["id"], $owner_uid);
			$unread += getCategoryChildrenUnread($link, $line["id"], $owner_uid);
		}

		return $unread;
	}

	function getCategoryUnread($link, $cat, $owner_uid = false) {

		if (!$owner_uid) $owner_uid = $_SESSION["uid"];

		if ($cat >= 0) {

			if ($cat != 0) {
				$cat_query = "cat_id = '$cat'";
			} else {
				$cat_query = "cat_id IS NULL";
			}

			$result = db_query($link, "SELECT id FROM ttrss_feeds WHERE $cat_query
					AND owner_uid = " . $owner_uid);

			$cat_feeds = array();
			while ($line = db_fetch_assoc($result)) {
				array_push($cat_feeds, "feed_id = " . $line["id"]);
			}

			if (count($cat_feeds) == 0) return 0;

			$match_part = implode(" OR ", $cat_feeds);

			$result = db_query($link, "SELECT COUNT(int_id) AS unread
				FROM ttrss_user_entries
				WHERE	unread = true AND ($match_part)
				AND owner_uid = " . $owner_uid);

			$unread = 0;

			# this needs to be rewritten
			while ($line = db_fetch_assoc($result)) {
				$unread += $line["unread"];
			}

			return $unread;
		} else if ($cat == -1) {
			return getFeedUnread($link, -1) + getFeedUnread($link, -2) + getFeedUnread($link, -3) + getFeedUnread($link, 0);
		} else if ($cat == -2) {

			$result = db_query($link, "
				SELECT COUNT(unread) AS unread FROM
					ttrss_user_entries, ttrss_user_labels2
				WHERE article_id = ref_id AND unread = true
					AND ttrss_user_entries.owner_uid = '$owner_uid'");

			$unread = db_fetch_result($result, 0, "unread");

			return $unread;

		}
	}

	function getFeedUnread($link, $feed, $is_cat = false) {
		return getFeedArticles($link, $feed, $is_cat, true, $_SESSION["uid"]);
	}

	function getLabelUnread($link, $label_id, $owner_uid = false) {
		if (!$owner_uid) $owner_uid = $_SESSION["uid"];

		$result = db_query($link, "SELECT COUNT(ref_id) AS unread FROM ttrss_user_entries, ttrss_user_labels2
			WHERE owner_uid = '$owner_uid' AND unread = true AND label_id = '$label_id' AND article_id = ref_id");

		if (db_num_rows($result) != 0) {
			return db_fetch_result($result, 0, "unread");
		} else {
			return 0;
		}
	}

	function getFeedArticles($link, $feed, $is_cat = false, $unread_only = false,
		$owner_uid = false) {

		$n_feed = (int) $feed;
		$need_entries = false;

		if (!$owner_uid) $owner_uid = $_SESSION["uid"];

		if ($unread_only) {
			$unread_qpart = "unread = true";
		} else {
			$unread_qpart = "true";
		}

		if ($is_cat) {
			return getCategoryUnread($link, $n_feed, $owner_uid);
		} else if ($n_feed == -6) {
			return 0;
		} else if ($feed != "0" && $n_feed == 0) {

			$feed = db_escape_string($feed);

			$result = db_query($link, "SELECT SUM((SELECT COUNT(int_id)
				FROM ttrss_user_entries,ttrss_entries WHERE int_id = post_int_id
					AND ref_id = id AND $unread_qpart)) AS count FROM ttrss_tags
				WHERE owner_uid = $owner_uid AND tag_name = '$feed'");
			return db_fetch_result($result, 0, "count");

		} else if ($n_feed == -1) {
			$match_part = "marked = true";
		} else if ($n_feed == -2) {
			$match_part = "published = true";
		} else if ($n_feed == -3) {
			$match_part = "unread = true AND score >= 0";

			$intl = get_pref($link, "FRESH_ARTICLE_MAX_AGE", $owner_uid);

			if (DB_TYPE == "pgsql") {
				$match_part .= " AND updated > NOW() - INTERVAL '$intl hour' ";
			} else {
				$match_part .= " AND updated > DATE_SUB(NOW(), INTERVAL $intl HOUR) ";
			}

			$need_entries = true;

		} else if ($n_feed == -4) {
			$match_part = "true";
		} else if ($n_feed >= 0) {

			if ($n_feed != 0) {
				$match_part = "feed_id = '$n_feed'";
			} else {
				$match_part = "feed_id IS NULL";
			}

		} else if ($feed < -10) {

			$label_id = -$feed - 11;

			return getLabelUnread($link, $label_id, $owner_uid);

		}

		if ($match_part) {

			if ($need_entries) {
				$from_qpart = "ttrss_user_entries,ttrss_entries";
				$from_where = "ttrss_entries.id = ttrss_user_entries.ref_id AND";
			} else {
				$from_qpart = "ttrss_user_entries";
			}

			$query = "SELECT count(int_id) AS unread
				FROM $from_qpart WHERE
				$unread_qpart AND $from_where ($match_part) AND ttrss_user_entries.owner_uid = $owner_uid";

			//echo "[$feed/$query]\n";

			$result = db_query($link, $query);

		} else {

			$result = db_query($link, "SELECT COUNT(post_int_id) AS unread
				FROM ttrss_tags,ttrss_user_entries,ttrss_entries
				WHERE tag_name = '$feed' AND post_int_id = int_id AND ref_id = ttrss_entries.id
				AND $unread_qpart AND ttrss_tags.owner_uid = " . $owner_uid);
		}

		$unread = db_fetch_result($result, 0, "unread");

		return $unread;
	}

	function getGlobalUnread($link, $user_id = false) {

		if (!$user_id) {
			$user_id = $_SESSION["uid"];
		}

		$result = db_query($link, "SELECT SUM(value) AS c_id FROM ttrss_counters_cache
			WHERE owner_uid = '$user_id' AND feed_id > 0");

		$c_id = db_fetch_result($result, 0, "c_id");

		return $c_id;
	}

	function getGlobalCounters($link, $global_unread = -1) {
		$ret_arr = array();

		if ($global_unread == -1) {
			$global_unread = getGlobalUnread($link);
		}

		$cv = array("id" => "global-unread",
			"counter" => (int) $global_unread);

		array_push($ret_arr, $cv);

		$result = db_query($link, "SELECT COUNT(id) AS fn FROM
			ttrss_feeds WHERE owner_uid = " . $_SESSION["uid"]);

		$subscribed_feeds = db_fetch_result($result, 0, "fn");

		$cv = array("id" => "subscribed-feeds",
			"counter" => (int) $subscribed_feeds);

		array_push($ret_arr, $cv);

		return $ret_arr;
	}

	function getVirtCounters($link) {

		$ret_arr = array();

		for ($i = 0; $i >= -4; $i--) {

			$count = getFeedUnread($link, $i);

			$cv = array("id" => $i,
				"counter" => (int) $count);

//			if (get_pref($link, 'EXTENDED_FEEDLIST'))
//				$cv["xmsg"] = getFeedArticles($link, $i)." ".__("total");

			array_push($ret_arr, $cv);
		}

		return $ret_arr;
	}

	function getLabelCounters($link, $descriptions = false) {

		$ret_arr = array();

		$owner_uid = $_SESSION["uid"];

		$result = db_query($link, "SELECT id, caption FROM ttrss_labels2
			WHERE owner_uid = '$owner_uid'");

		while ($line = db_fetch_assoc($result)) {

			$id = -$line["id"] - 11;

			$label_name = $line["caption"];
			$count = getFeedUnread($link, $id);

			$cv = array("id" => $id,
				"counter" => (int) $count);

			if ($descriptions)
				$cv["description"] = $label_name;

//			if (get_pref($link, 'EXTENDED_FEEDLIST'))
//				$cv["xmsg"] = getFeedArticles($link, $id)." ".__("total");

			array_push($ret_arr, $cv);
		}

		return $ret_arr;
	}

	function getFeedCounters($link, $active_feed = false) {

		$ret_arr = array();

		$query = "SELECT ttrss_feeds.id,
				ttrss_feeds.title,
				".SUBSTRING_FOR_DATE."(ttrss_feeds.last_updated,1,19) AS last_updated,
				last_error, value AS count
			FROM ttrss_feeds, ttrss_counters_cache
			WHERE ttrss_feeds.owner_uid = ".$_SESSION["uid"]."
				AND ttrss_counters_cache.owner_uid = ttrss_feeds.owner_uid
				AND ttrss_counters_cache.feed_id = id";

		$result = db_query($link, $query);
		$fctrs_modified = false;

		while ($line = db_fetch_assoc($result)) {

			$id = $line["id"];
			$count = $line["count"];
			$last_error = htmlspecialchars($line["last_error"]);

			$last_updated = make_local_datetime($link, $line['last_updated'], false);

			$has_img = feed_has_icon($id);

			if (date('Y') - date('Y', strtotime($line['last_updated'])) > 2)
				$last_updated = '';

			$cv = array("id" => $id,
				"updated" => $last_updated,
				"counter" => (int) $count,
				"has_img" => (int) $has_img);

			if ($last_error)
				$cv["error"] = $last_error;

//			if (get_pref($link, 'EXTENDED_FEEDLIST'))
//				$cv["xmsg"] = getFeedArticles($link, $id)." ".__("total");

			if ($active_feed && $id == $active_feed)
				$cv["title"] = truncate_string($line["title"], 30);

			array_push($ret_arr, $cv);

		}

		return $ret_arr;
	}

	function get_pgsql_version($link) {
		$result = db_query($link, "SELECT version() AS version");
		$version = explode(" ", db_fetch_result($result, 0, "version"));
		return $version[1];
	}

	/**
	 * @return array (code => Status code, message => error message if available)
	 *
	 *                 0 - OK, Feed already exists
	 *                 1 - OK, Feed added
	 *                 2 - Invalid URL
	 *                 3 - URL content is HTML, no feeds available
	 *                 4 - URL content is HTML which contains multiple feeds.
	 *                     Here you should call extractfeedurls in rpc-backend
	 *                     to get all possible feeds.
	 *                 5 - Couldn't download the URL content.
	 */
	function subscribe_to_feed($link, $url, $cat_id = 0,
			$auth_login = '', $auth_pass = '', $need_auth = false) {

		global $fetch_last_error;

		require_once "include/rssfuncs.php";

		$url = fix_url($url);

		if (!$url || !validate_feed_url($url)) return array("code" => 2);

		$contents = @fetch_file_contents($url, false, $auth_login, $auth_pass);

		if (!$contents) {
			return array("code" => 5, "message" => $fetch_last_error);
		}

		if (is_html($contents)) {
			$feedUrls = get_feeds_from_html($url, $contents);

			if (count($feedUrls) == 0) {
				return array("code" => 3);
			} else if (count($feedUrls) > 1) {
				return array("code" => 4, "feeds" => $feedUrls);
			}
			//use feed url as new URL
			$url = key($feedUrls);
		}

		if ($cat_id == "0" || !$cat_id) {
			$cat_qpart = "NULL";
		} else {
			$cat_qpart = "'$cat_id'";
		}

		$result = db_query($link,
			"SELECT id FROM ttrss_feeds
			WHERE feed_url = '$url' AND owner_uid = ".$_SESSION["uid"]);

		if (db_num_rows($result) == 0) {
			$result = db_query($link,
				"INSERT INTO ttrss_feeds
					(owner_uid,feed_url,title,cat_id, auth_login,auth_pass,update_method)
				VALUES ('".$_SESSION["uid"]."', '$url',
				'[Unknown]', $cat_qpart, '$auth_login', '$auth_pass', 0)");

			$result = db_query($link,
				"SELECT id FROM ttrss_feeds WHERE feed_url = '$url'
					AND owner_uid = " . $_SESSION["uid"]);

			$feed_id = db_fetch_result($result, 0, "id");

			if ($feed_id) {
				update_rss_feed($link, $feed_id, true);
			}

			return array("code" => 1);
		} else {
			return array("code" => 0);
		}
	}

	function print_feed_select($link, $id, $default_id = "",
		$attributes = "", $include_all_feeds = true,
	  	$root_id = false, $nest_level = 0) {

		if (!$root_id) {
			print "<select id=\"$id\" name=\"$id\" $attributes>";
			if ($include_all_feeds) {
				$is_selected = ("0" == $default_id) ? "selected=\"1\"" : "";
				print "<option $is_selected value=\"0\">".__('All feeds')."</option>";
			}
		}

		if (get_pref($link, 'ENABLE_FEED_CATS')) {

			if ($root_id)
				$parent_qpart = "parent_cat = '$root_id'";
			else
				$parent_qpart = "parent_cat IS NULL";

			$result = db_query($link, "SELECT id,title,
				(SELECT COUNT(id) FROM ttrss_feed_categories AS c2 WHERE
					c2.parent_cat = ttrss_feed_categories.id) AS num_children
				FROM ttrss_feed_categories
				WHERE owner_uid = ".$_SESSION["uid"]." AND $parent_qpart ORDER BY title");

			while ($line = db_fetch_assoc($result)) {

				for ($i = 0; $i < $nest_level; $i++)
					$line["title"] = " - " . $line["title"];

				$is_selected = ("CAT:".$line["id"] == $default_id) ? "selected=\"1\"" : "";

				printf("<option $is_selected value='CAT:%d'>%s</option>",
					$line["id"], htmlspecialchars($line["title"]));

				if ($line["num_children"] > 0)
					print_feed_select($link, $id, $default_id, $attributes,
						$include_all_feeds, $line["id"], $nest_level+1);

				$feed_result = db_query($link, "SELECT id,title FROM ttrss_feeds
					WHERE cat_id = '".$line["id"]."' AND owner_uid = ".$_SESSION["uid"] . " ORDER BY title");

				while ($fline = db_fetch_assoc($feed_result)) {
					$is_selected = ($fline["id"] == $default_id) ? "selected=\"1\"" : "";

					$fline["title"] = " + " . $fline["title"];

					for ($i = 0; $i < $nest_level; $i++)
						$fline["title"] = " - " . $fline["title"];

					printf("<option $is_selected value='%d'>%s</option>",
						$fline["id"], htmlspecialchars($fline["title"]));
				}
			}

			if (!$root_id) {
				$is_selected = ($default_id == "CAT:0") ? "selected=\"1\"" : "";

				printf("<option $is_selected value='CAT:0'>%s</option>",
					__("Uncategorized"));

				$feed_result = db_query($link, "SELECT id,title FROM ttrss_feeds
					WHERE cat_id IS NULL AND owner_uid = ".$_SESSION["uid"] . " ORDER BY title");

				while ($fline = db_fetch_assoc($feed_result)) {
					$is_selected = ($fline["id"] == $default_id && !$default_is_cat) ? "selected=\"1\"" : "";

					$fline["title"] = " + " . $fline["title"];

					for ($i = 0; $i < $nest_level; $i++)
						$fline["title"] = " - " . $fline["title"];

					printf("<option $is_selected value='%d'>%s</option>",
						$fline["id"], htmlspecialchars($fline["title"]));
				}
			}

		} else {
			$result = db_query($link, "SELECT id,title FROM ttrss_feeds
				WHERE owner_uid = ".$_SESSION["uid"]." ORDER BY title");

			while ($line = db_fetch_assoc($result)) {

				$is_selected = ($line["id"] == $default_id) ? "selected=\"1\"" : "";

				printf("<option $is_selected value='%d'>%s</option>",
					$line["id"], htmlspecialchars($line["title"]));
			}
		}

		if (!$root_id) {
			print "</select>";
		}
	}

	function print_feed_cat_select($link, $id, $default_id,
		$attributes, $include_all_cats = true, $root_id = false, $nest_level = 0) {

			if (!$root_id) {
					print "<select id=\"$id\" name=\"$id\" default=\"$default_id\" onchange=\"catSelectOnChange(this)\" $attributes>";
			}

			if ($root_id)
				$parent_qpart = "parent_cat = '$root_id'";
			else
				$parent_qpart = "parent_cat IS NULL";

			$result = db_query($link, "SELECT id,title,
				(SELECT COUNT(id) FROM ttrss_feed_categories AS c2 WHERE
					c2.parent_cat = ttrss_feed_categories.id) AS num_children
				FROM ttrss_feed_categories
				WHERE owner_uid = ".$_SESSION["uid"]." AND $parent_qpart ORDER BY title");

			while ($line = db_fetch_assoc($result)) {
				if ($line["id"] == $default_id) {
					$is_selected = "selected=\"1\"";
				} else {
					$is_selected = "";
				}

				for ($i = 0; $i < $nest_level; $i++)
					$line["title"] = " - " . $line["title"];

				if ($line["title"])
					printf("<option $is_selected value='%d'>%s</option>",
						$line["id"], htmlspecialchars($line["title"]));

				if ($line["num_children"] > 0)
					print_feed_cat_select($link, $id, $default_id, $attributes,
						$include_all_cats, $line["id"], $nest_level+1);
			}

			if (!$root_id) {
				if ($include_all_cats) {
					if (db_num_rows($result) > 0) {
						print "<option disabled=\"1\">--------</option>";
					}

					if ($default_id == 0) {
						$is_selected = "selected=\"1\"";
					} else {
						$is_selected = "";
					}

					print "<option $is_selected value=\"0\">".__('Uncategorized')."</option>";
				}
				print "</select>";
			}
		}

	function checkbox_to_sql_bool($val) {
		return ($val == "on") ? "true" : "false";
	}

	function getFeedCatTitle($link, $id) {
		if ($id == -1) {
			return __("Special");
		} else if ($id < -10) {
			return __("Labels");
		} else if ($id > 0) {
			$result = db_query($link, "SELECT ttrss_feed_categories.title
				FROM ttrss_feeds, ttrss_feed_categories WHERE ttrss_feeds.id = '$id' AND
					cat_id = ttrss_feed_categories.id");
			if (db_num_rows($result) == 1) {
				return db_fetch_result($result, 0, "title");
			} else {
				return __("Uncategorized");
			}
		} else {
			return "getFeedCatTitle($id) failed";
		}

	}

	function getFeedIcon($id) {
		switch ($id) {
		case 0:
			return "images/archive.png";
			break;
		case -1:
			return "images/mark_set.svg";
			break;
		case -2:
			return "images/pub_set.svg";
			break;
		case -3:
			return "images/fresh.png";
			break;
		case -4:
			return "images/tag.png";
			break;
		case -6:
			return "images/recently_read.png";
			break;
		default:
			if ($id < -10) {
				return "images/label.png";
			} else {
				if (file_exists(ICONS_DIR . "/$id.ico"))
					return ICONS_URL . "/$id.ico";
			}
			break;
		}
	}

	function getFeedTitle($link, $id, $cat = false) {
		if ($cat) {
			return getCategoryTitle($link, $id);
		} else if ($id == -1) {
			return __("Starred articles");
		} else if ($id == -2) {
			return __("Published articles");
		} else if ($id == -3) {
			return __("Fresh articles");
		} else if ($id == -4) {
			return __("All articles");
		} else if ($id === 0 || $id === "0") {
			return __("Archived articles");
		} else if ($id == -6) {
			return __("Recently read");
		} else if ($id < -10) {
			$label_id = -$id - 11;
			$result = db_query($link, "SELECT caption FROM ttrss_labels2 WHERE id = '$label_id'");
			if (db_num_rows($result) == 1) {
				return db_fetch_result($result, 0, "caption");
			} else {
				return "Unknown label ($label_id)";
			}

		} else if (is_numeric($id) && $id > 0) {
			$result = db_query($link, "SELECT title FROM ttrss_feeds WHERE id = '$id'");
			if (db_num_rows($result) == 1) {
				return db_fetch_result($result, 0, "title");
			} else {
				return "Unknown feed ($id)";
			}
		} else {
			return $id;
		}
	}

	function make_init_params($link) {
		$params = array();

		$params["sign_progress"] = theme_image($link, "images/indicator_white.gif");
		$params["sign_progress_tiny"] = theme_image($link, "images/indicator_tiny.gif");
		$params["sign_excl"] = theme_image($link, "images/sign_excl.svg");
		$params["sign_info"] = theme_image($link, "images/sign_info.svg");

		foreach (array("ON_CATCHUP_SHOW_NEXT_FEED", "HIDE_READ_FEEDS",
			"ENABLE_FEED_CATS", "FEEDS_SORT_BY_UNREAD", "CONFIRM_FEED_CATCHUP",
			"CDM_AUTO_CATCHUP", "FRESH_ARTICLE_MAX_AGE", "DEFAULT_ARTICLE_LIMIT",
			"HIDE_READ_SHOWS_SPECIAL", "COMBINED_DISPLAY_MODE") as $param) {

				 $params[strtolower($param)] = (int) get_pref($link, $param);
		 }

		$params["icons_url"] = ICONS_URL;
		$params["cookie_lifetime"] = SESSION_COOKIE_LIFETIME;
		$params["default_view_mode"] = get_pref($link, "_DEFAULT_VIEW_MODE");
		$params["default_view_limit"] = (int) get_pref($link, "_DEFAULT_VIEW_LIMIT");
		$params["default_view_order_by"] = get_pref($link, "_DEFAULT_VIEW_ORDER_BY");
		$params["bw_limit"] = (int) $_SESSION["bw_limit"];

		$result = db_query($link, "SELECT MAX(id) AS mid, COUNT(*) AS nf FROM
			ttrss_feeds WHERE owner_uid = " . $_SESSION["uid"]);

		$max_feed_id = db_fetch_result($result, 0, "mid");
		$num_feeds = db_fetch_result($result, 0, "nf");

		$params["max_feed_id"] = (int) $max_feed_id;
		$params["num_feeds"] = (int) $num_feeds;

		$params["collapsed_feedlist"] = (int) get_pref($link, "_COLLAPSED_FEEDLIST");
		$params["hotkeys"] = get_hotkeys_map($link);

		$params["csrf_token"] = $_SESSION["csrf_token"];
		$params["widescreen"] = (int) $_COOKIE["ttrss_widescreen"];

		$params['simple_update'] = defined('SIMPLE_UPDATE_MODE') && SIMPLE_UPDATE_MODE;

		return $params;
	}

	function get_hotkeys_info($link) {
		$hotkeys = array(
			__("Navigation") => array(
				"next_feed" => __("Open next feed"),
				"prev_feed" => __("Open previous feed"),
				"next_article" => __("Open next article"),
				"prev_article" => __("Open previous article"),
				"search_dialog" => __("Show search dialog")),
			__("Article") => array(
				"toggle_mark" => __("Toggle starred"),
				"toggle_publ" => __("Toggle published"),
				"toggle_unread" => __("Toggle unread"),
				"edit_tags" => __("Edit tags"),
				"dismiss_selected" => __("Dismiss selected"),
				"dismiss_read" => __("Dismiss read"),
				"open_in_new_window" => __("Open in new window"),
				"catchup_below" => __("Mark below as read"),
				"catchup_above" => __("Mark above as read"),
				"article_scroll_down" => __("Scroll down"),
				"article_scroll_up" => __("Scroll up"),
				"select_article_cursor" => __("Select article under cursor"),
				"email_article" => __("Email article"),
				"close_article" => __("Close article"),
				"toggle_widescreen" => __("Toggle widescreen mode")),
			__("Article selection") => array(
				"select_all" => __("Select all articles"),
				"select_unread" => __("Select unread"),
				"select_marked" => __("Select starred"),
				"select_published" => __("Select published"),
				"select_invert" => __("Invert selection"),
				"select_none" => __("Deselect everything")),
			__("Feed") => array(
				"feed_refresh" => __("Refresh current feed"),
				"feed_unhide_read" => __("Un/hide read feeds"),
				"feed_subscribe" => __("Subscribe to feed"),
				"feed_edit" => __("Edit feed"),
				"feed_catchup" => __("Mark as read"),
				"feed_reverse" => __("Reverse headlines"),
				"feed_debug_update" => __("Debug feed update"),
				"catchup_all" => __("Mark all feeds as read"),
				"cat_toggle_collapse" => __("Un/collapse current category")),
			__("Go to") => array(
				"goto_all" => __("All articles"),
				"goto_fresh" => __("Fresh"),
				"goto_marked" => __("Starred"),
				"goto_published" => __("Published"),
				"goto_tagcloud" => __("Tag cloud"),
				"goto_prefs" => __("Preferences")),
			__("Other") => array(
				"create_label" => __("Create label"),
				"create_filter" => __("Create filter"),
				"collapse_sidebar" => __("Un/collapse sidebar"),
				"help_dialog" => __("Show help dialog"))
			);

		return $hotkeys;
	}

	function get_hotkeys_map($link) {
		$hotkeys = array(
//			"navigation" => array(
				"k" => "next_feed",
				"j" => "prev_feed",
				"n" => "next_article",
				"p" => "prev_article",
				"(38)|up" => "prev_article",
				"(40)|down" => "next_article",
				"(191)|/" => "search_dialog",
//			"article" => array(
				"s" => "toggle_mark",
				"S" => "toggle_publ",
				"u" => "toggle_unread",
				"T" => "edit_tags",
				"D" => "dismiss_selected",
				"X" => "dismiss_read",
				"o" => "open_in_new_window",
				"c p" => "catchup_below",
				"c n" => "catchup_above",
				"N" => "article_scroll_down",
				"P" => "article_scroll_up",
				"a W" => "toggle_widescreen",
				"e" => "email_article",
				"a q" => "close_article",
//			"article_selection" => array(
				"a a" => "select_all",
				"a u" => "select_unread",
				"a U" => "select_marked",
				"a p" => "select_published",
				"a i" => "select_invert",
				"a n" => "select_none",
//			"feed" => array(
				"f r" => "feed_refresh",
				"f a" => "feed_unhide_read",
				"f s" => "feed_subscribe",
				"f e" => "feed_edit",
				"f q" => "feed_catchup",
				"f x" => "feed_reverse",
				"f D" => "feed_debug_update",
				"Q" => "catchup_all",
				"x" => "cat_toggle_collapse",
//			"goto" => array(
				"g a" => "goto_all",
				"g f" => "goto_fresh",
				"g s" => "goto_marked",
				"g p" => "goto_published",
				"g t" => "goto_tagcloud",
				"g P" => "goto_prefs",
//			"other" => array(
				"(9)|Tab" => "select_article_cursor", // tab
				"c l" => "create_label",
				"c f" => "create_filter",
				"c s" => "collapse_sidebar",
				"^(191)|Ctrl+/" => "help_dialog",
			);

		global $pluginhost;
		foreach ($pluginhost->get_hooks($pluginhost::HOOK_HOTKEY_MAP) as $plugin) {
			$hotkeys = $plugin->hook_hotkey_map($hotkeys);
		}

		$prefixes = array();

		foreach (array_keys($hotkeys) as $hotkey) {
			$pair = explode(" ", $hotkey, 2);

			if (count($pair) > 1 && !in_array($pair[0], $prefixes)) {
				array_push($prefixes, $pair[0]);
			}
		}

		return array($prefixes, $hotkeys);
	}

	function make_runtime_info($link) {
		$data = array();

		$result = db_query($link, "SELECT MAX(id) AS mid, COUNT(*) AS nf FROM
			ttrss_feeds WHERE owner_uid = " . $_SESSION["uid"]);

		$max_feed_id = db_fetch_result($result, 0, "mid");
		$num_feeds = db_fetch_result($result, 0, "nf");

		$data["max_feed_id"] = (int) $max_feed_id;
		$data["num_feeds"] = (int) $num_feeds;

		$data['last_article_id'] = getLastArticleId($link);
		$data['cdm_expanded'] = get_pref($link, 'CDM_EXPANDED');

		if (file_exists(LOCK_DIRECTORY . "/update_daemon.lock")) {

			$data['daemon_is_running'] = (int) file_is_locked("update_daemon.lock");

			if (time() - $_SESSION["daemon_stamp_check"] > 30) {

				$stamp = (int) @file_get_contents(LOCK_DIRECTORY . "/update_daemon.stamp");

				if ($stamp) {
					$stamp_delta = time() - $stamp;

					if ($stamp_delta > 1800) {
						$stamp_check = 0;
					} else {
						$stamp_check = 1;
						$_SESSION["daemon_stamp_check"] = time();
					}

					$data['daemon_stamp_ok'] = $stamp_check;

					$stamp_fmt = date("Y.m.d, G:i", $stamp);

					$data['daemon_stamp'] = $stamp_fmt;
				}
			}
		}

		if ($_SESSION["last_version_check"] + 86400 + rand(-1000, 1000) < time()) {
				$new_version_details = @check_for_update($link);

				$data['new_version_available'] = (int) ($new_version_details != false);

				$_SESSION["last_version_check"] = time();
				$_SESSION["version_data"] = $new_version_details;
		}

		return $data;
	}

	function search_to_sql($link, $search, $match_on) {

		$search_query_part = "";

		$keywords = explode(" ", $search);
		$query_keywords = array();

		foreach ($keywords as $k) {
			if (strpos($k, "-") === 0) {
				$k = substr($k, 1);
				$not = "NOT";
			} else {
				$not = "";
			}

			$commandpair = explode(":", mb_strtolower($k), 2);

			if ($commandpair[0] == "note" && $commandpair[1]) {

				if ($commandpair[1] == "true")
					array_push($query_keywords, "($not (note IS NOT NULL AND note != ''))");
				else
					array_push($query_keywords, "($not (note IS NULL OR note = ''))");

			} else if ($commandpair[0] == "star" && $commandpair[1]) {

				if ($commandpair[1] == "true")
					array_push($query_keywords, "($not (marked = true))");
				else
					array_push($query_keywords, "($not (marked = false))");

			} else if ($commandpair[0] == "pub" && $commandpair[1]) {

				if ($commandpair[1] == "true")
					array_push($query_keywords, "($not (published = true))");
				else
					array_push($query_keywords, "($not (published = false))");

			} else if (strpos($k, "@") === 0) {

				$user_tz_string = get_pref($link, 'USER_TIMEZONE', $_SESSION['uid']);
				$orig_ts = strtotime(substr($k, 1));
				$k = date("Y-m-d", convert_timestamp($orig_ts, $user_tz_string, 'UTC'));

				//$k = date("Y-m-d", strtotime(substr($k, 1)));

				array_push($query_keywords, "(".SUBSTRING_FOR_DATE."(updated,1,LENGTH('$k')) $not = '$k')");
			} else if ($match_on == "both") {
				array_push($query_keywords, "(UPPER(ttrss_entries.title) $not LIKE UPPER('%$k%')
						OR UPPER(ttrss_entries.content) $not LIKE UPPER('%$k%'))");
			} else if ($match_on == "title") {
				array_push($query_keywords, "(UPPER(ttrss_entries.title) $not LIKE UPPER('%$k%'))");
			} else if ($match_on == "content") {
				array_push($query_keywords, "(UPPER(ttrss_entries.content) $not LIKE UPPER('%$k%'))");
			}
		}

		$search_query_part = implode("AND", $query_keywords);

		return $search_query_part;
	}

	function getParentCategories($link, $cat, $owner_uid) {
		$rv = array();

		$result = db_query($link, "SELECT parent_cat FROM ttrss_feed_categories
			WHERE id = '$cat' AND parent_cat IS NOT NULL AND owner_uid = $owner_uid");

		while ($line = db_fetch_assoc($result)) {
			array_push($rv, $line["parent_cat"]);
			$rv = array_merge($rv, getParentCategories($link, $line["parent_cat"], $owner_uid));
		}

		return $rv;
	}

	function getChildCategories($link, $cat, $owner_uid) {
		$rv = array();

		$result = db_query($link, "SELECT id FROM ttrss_feed_categories
			WHERE parent_cat = '$cat' AND owner_uid = $owner_uid");

		while ($line = db_fetch_assoc($result)) {
			array_push($rv, $line["id"]);
			$rv = array_merge($rv, getChildCategories($link, $line["id"], $owner_uid));
		}

		return $rv;
	}

	function queryFeedHeadlines($link, $feed, $limit, $view_mode, $cat_view, $search, $search_mode, $match_on, $override_order = false, $offset = 0, $owner_uid = 0, $filter = false, $since_id = 0, $include_children = false, $ignore_vfeed_group = false) {

		if (!$owner_uid) $owner_uid = $_SESSION["uid"];

		$ext_tables_part = "";

			if ($search) {

				if (SPHINX_ENABLED) {
					$ids = join(",", @sphinx_search($search, 0, 500));

					if ($ids)
						$search_query_part = "ref_id IN ($ids) AND ";
					else
						$search_query_part = "ref_id = -1 AND ";

				} else {
					$search_query_part = search_to_sql($link, $search, $match_on);
					$search_query_part .= " AND ";
				}

			} else {
				$search_query_part = "";
			}

			if ($filter) {

				if (DB_TYPE == "pgsql") {
					$query_strategy_part .= " AND updated > NOW() - INTERVAL '14 days' ";
				} else {
					$query_strategy_part .= " AND updated > DATE_SUB(NOW(), INTERVAL 14 DAY) ";
				}

				$override_order = "updated DESC";

				$filter_query_part = filter_to_sql($link, $filter, $owner_uid);

				// Try to check if SQL regexp implementation chokes on a valid regexp
				$result = db_query($link, "SELECT true AS true_val FROM ttrss_entries,
					ttrss_user_entries, ttrss_feeds, ttrss_feed_categories
					WHERE $filter_query_part LIMIT 1", false);

				if ($result) {
					$test = db_fetch_result($result, 0, "true_val");

					if (!$test) {
						$filter_query_part = "false AND";
					} else {
						$filter_query_part .= " AND";
					}
				} else {
					$filter_query_part = "false AND";
				}

			} else {
				$filter_query_part = "";
			}

			if ($since_id) {
				$since_id_part = "ttrss_entries.id > $since_id AND ";
			} else {
				$since_id_part = "";
			}

			$view_query_part = "";

			if ($view_mode == "adaptive" || $view_query_part == "noscores") {
				if ($search) {
					$view_query_part = " ";
				} else if ($feed != -1) {
					$unread = getFeedUnread($link, $feed, $cat_view);

					if ($cat_view && $feed > 0 && $include_children)
						$unread += getCategoryChildrenUnread($link, $feed);

					if ($unread > 0) {
						$view_query_part = " unread = true AND ";
					}
				}
			}

			if ($view_mode == "marked") {
				$view_query_part = " marked = true AND ";
			}

			if ($view_mode == "published") {
				$view_query_part = " published = true AND ";
			}

			if ($view_mode == "unread") {
				$view_query_part = " unread = true AND ";
			}

			if ($view_mode == "updated") {
				$view_query_part = " (last_read is null and unread = false) AND ";
			}

			if ($limit > 0) {
				$limit_query_part = "LIMIT " . $limit;
			}

			$allow_archived = false;

			$vfeed_query_part = "";

			// override query strategy and enable feed display when searching globally
			if ($search && $search_mode == "all_feeds") {
				$query_strategy_part = "true";
				$vfeed_query_part = "ttrss_feeds.title AS feed_title,";
			/* tags */
			} else if (!is_numeric($feed)) {
				$query_strategy_part = "true";
				$vfeed_query_part = "(SELECT title FROM ttrss_feeds WHERE
					id = feed_id) as feed_title,";
			} else if ($search && $search_mode == "this_cat") {
				$vfeed_query_part = "ttrss_feeds.title AS feed_title,";

				if ($feed > 0) {
					if ($include_children) {
						$subcats = getChildCategories($link, $feed, $owner_uid);
						array_push($subcats, $feed);
						$cats_qpart = join(",", $subcats);
					} else {
						$cats_qpart = $feed;
					}

					$query_strategy_part = "ttrss_feeds.cat_id IN ($cats_qpart)";

				} else {
					$query_strategy_part = "ttrss_feeds.cat_id IS NULL";
				}

			} else if ($feed > 0) {

				if ($cat_view) {

					if ($feed > 0) {
						if ($include_children) {
							# sub-cats
							$subcats = getChildCategories($link, $feed, $owner_uid);

							array_push($subcats, $feed);
							$query_strategy_part = "cat_id IN (".
									implode(",", $subcats).")";

						} else {
							$query_strategy_part = "cat_id = '$feed'";
						}

					} else {
						$query_strategy_part = "cat_id IS NULL";
					}

					$vfeed_query_part = "ttrss_feeds.title AS feed_title,";

				} else {
					$query_strategy_part = "feed_id = '$feed'";
				}
			} else if ($feed == 0 && !$cat_view) { // archive virtual feed
				$query_strategy_part = "feed_id IS NULL";
				$allow_archived = true;
			} else if ($feed == 0 && $cat_view) { // uncategorized
				$query_strategy_part = "cat_id IS NULL AND feed_id IS NOT NULL";
				$vfeed_query_part = "ttrss_feeds.title AS feed_title,";
			} else if ($feed == -1) { // starred virtual feed
				$query_strategy_part = "marked = true";
				$vfeed_query_part = "ttrss_feeds.title AS feed_title,";
				$allow_archived = true;

			} else if ($feed == -2) { // published virtual feed OR labels category

				if (!$cat_view) {
					$query_strategy_part = "published = true";
					$vfeed_query_part = "ttrss_feeds.title AS feed_title,";
					$allow_archived = true;

					if (!$override_order) $override_order = "last_read DESC, updated DESC";
				} else {
					$vfeed_query_part = "ttrss_feeds.title AS feed_title,";

					$ext_tables_part = ",ttrss_labels2,ttrss_user_labels2";

					$query_strategy_part = "ttrss_labels2.id = ttrss_user_labels2.label_id AND
						ttrss_user_labels2.article_id = ref_id";

				}
			} else if ($feed == -6) { // recently read
				$query_strategy_part = "unread = false AND last_read IS NOT NULL";
				$vfeed_query_part = "ttrss_feeds.title AS feed_title,";
				$allow_archived = true;

				if (!$override_order) $override_order = "last_read DESC";
			} else if ($feed == -3) { // fresh virtual feed
				$query_strategy_part = "unread = true AND score >= 0";

				$intl = get_pref($link, "FRESH_ARTICLE_MAX_AGE", $owner_uid);

				if (DB_TYPE == "pgsql") {
					$query_strategy_part .= " AND updated > NOW() - INTERVAL '$intl hour' ";
				} else {
					$query_strategy_part .= " AND updated > DATE_SUB(NOW(), INTERVAL $intl HOUR) ";
				}

				$vfeed_query_part = "ttrss_feeds.title AS feed_title,";
			} else if ($feed == -4) { // all articles virtual feed
				$query_strategy_part = "true";
				$vfeed_query_part = "ttrss_feeds.title AS feed_title,";
			} else if ($feed <= -10) { // labels
				$label_id = -$feed - 11;

				$query_strategy_part = "label_id = '$label_id' AND
					ttrss_labels2.id = ttrss_user_labels2.label_id AND
					ttrss_user_labels2.article_id = ref_id";

				$vfeed_query_part = "ttrss_feeds.title AS feed_title,";
				$ext_tables_part = ",ttrss_labels2,ttrss_user_labels2";
				$allow_archived = true;

			} else {
				$query_strategy_part = "true";
			}

			if (get_pref($link, "SORT_HEADLINES_BY_FEED_DATE", $owner_uid)) {
				$date_sort_field = "updated";
			} else {
				$date_sort_field = "date_entered";
			}

			if (get_pref($link, 'REVERSE_HEADLINES', $owner_uid)) {
				$order_by = "$date_sort_field";
			} else {
				$order_by = "$date_sort_field DESC";
			}

			if ($view_mode != "noscores") {
				$order_by = "score DESC, $order_by";
			}

			if ($override_order) {
				$order_by = $override_order;
			}

			$feed_title = "";

			if ($search) {
				$feed_title = T_sprintf("Search results: %s", $search);
			} else {
				if ($cat_view) {
					$feed_title = getCategoryTitle($link, $feed);
				} else {
					if (is_numeric($feed) && $feed > 0) {
						$result = db_query($link, "SELECT title,site_url,last_error
							FROM ttrss_feeds WHERE id = '$feed' AND owner_uid = $owner_uid");

						$feed_title = db_fetch_result($result, 0, "title");
						$feed_site_url = db_fetch_result($result, 0, "site_url");
						$last_error = db_fetch_result($result, 0, "last_error");
					} else {
						$feed_title = getFeedTitle($link, $feed);
					}
				}
			}

			$content_query_part = "content as content_preview, cached_content, ";

			if (is_numeric($feed)) {

				if ($feed >= 0) {
					$feed_kind = "Feeds";
				} else {
					$feed_kind = "Labels";
				}

				if ($limit_query_part) {
					$offset_query_part = "OFFSET $offset";
				}

				// proper override_order applied above
				if ($vfeed_query_part && !$ignore_vfeed_group && get_pref($link, 'VFEED_GROUP_BY_FEED', $owner_uid)) {
					if (!$override_order) {
						$order_by = "ttrss_feeds.title, $order_by";
					} else {
						$order_by = "ttrss_feeds.title, $override_order";
					}
				}

				if (!$allow_archived) {
					$from_qpart = "ttrss_entries,ttrss_user_entries,ttrss_feeds$ext_tables_part";
					$feed_check_qpart = "ttrss_user_entries.feed_id = ttrss_feeds.id AND";

				} else {
					$from_qpart = "ttrss_entries$ext_tables_part,ttrss_user_entries
						LEFT JOIN ttrss_feeds ON (feed_id = ttrss_feeds.id)";
				}

				$query = "SELECT DISTINCT
						date_entered,
						guid,
						ttrss_entries.id,ttrss_entries.title,
						updated,
						label_cache,
						tag_cache,
						always_display_enclosures,
						site_url,
						note,
						num_comments,
						comments,
						int_id,
						unread,feed_id,marked,published,link,last_read,orig_feed_id,
						".SUBSTRING_FOR_DATE."(last_read,1,19) as last_read_noms,
						$vfeed_query_part
						$content_query_part
						".SUBSTRING_FOR_DATE."(updated,1,19) as updated_noms,
						author,score
					FROM
						$from_qpart
					WHERE
					$feed_check_qpart
					ttrss_user_entries.ref_id = ttrss_entries.id AND
					ttrss_user_entries.owner_uid = '$owner_uid' AND
					$search_query_part
					$filter_query_part
					$view_query_part
					$since_id_part
					$query_strategy_part ORDER BY $order_by
					$limit_query_part $offset_query_part";

				if ($_REQUEST["debug"]) print $query;

				$result = db_query($link, $query);

			} else {
				// browsing by tag

				$select_qpart = "SELECT DISTINCT " .
								"date_entered," .
								"guid," .
								"note," .
								"ttrss_entries.id as id," .
								"title," .
								"updated," .
								"unread," .
								"feed_id," .
								"orig_feed_id," .
								"marked," .
								"num_comments, " .
								"comments, " .
								"tag_cache," .
								"label_cache," .
								"link," .
								"last_read," .
								SUBSTRING_FOR_DATE . "(last_read,1,19) as last_read_noms," .
								$since_id_part .
								$vfeed_query_part .
								$content_query_part .
								SUBSTRING_FOR_DATE . "(updated,1,19) as updated_noms," .
								"score ";

				$feed_kind = "Tags";
				$all_tags = explode(",", $feed);
				if ($search_mode == 'any') {
					$tag_sql = "tag_name in (" . implode(", ", array_map("db_quote", $all_tags)) . ")";
					$from_qpart = " FROM ttrss_entries,ttrss_user_entries,ttrss_tags ";
					$where_qpart = " WHERE " .
								   "ref_id = ttrss_entries.id AND " .
								   "ttrss_user_entries.owner_uid = $owner_uid AND " .
								   "post_int_id = int_id AND $tag_sql AND " .
								   $view_query_part .
								   $search_query_part .
								   $query_strategy_part . " ORDER BY $order_by " .
								   $limit_query_part;

				} else {
					$i = 1;
					$sub_selects = array();
					$sub_ands = array();
					foreach ($all_tags as $term) {
						array_push($sub_selects, "(SELECT post_int_id from ttrss_tags WHERE tag_name = " . db_quote($term) . " AND owner_uid = $owner_uid) as A$i");
						$i++;
					}
					if ($i > 2) {
						$x = 1;
						$y = 2;
						do {
							array_push($sub_ands, "A$x.post_int_id = A$y.post_int_id");
							$x++;
							$y++;
						} while ($y < $i);
					}
					array_push($sub_ands, "A1.post_int_id = ttrss_user_entries.int_id and ttrss_user_entries.owner_uid = $owner_uid");
					array_push($sub_ands, "ttrss_user_entries.ref_id = ttrss_entries.id");
					$from_qpart = " FROM " . implode(", ", $sub_selects) . ", ttrss_user_entries, ttrss_entries";
					$where_qpart = " WHERE " . implode(" AND ", $sub_ands);
				}
				//				error_log("TAG SQL: " . $tag_sql);
				// $tag_sql = "tag_name = '$feed'";   DEFAULT way

				//				error_log("[". $select_qpart . "][" . $from_qpart . "][" .$where_qpart . "]");
				$result = db_query($link, $select_qpart . $from_qpart . $where_qpart);
			}

			return array($result, $feed_title, $feed_site_url, $last_error);

	}

	function sanitize($link, $str, $force_strip_tags = false, $owner = false, $site_url = false) {
		if (!$owner) $owner = $_SESSION["uid"];

		$res = trim($str); if (!$res) return '';

		$config = array('safe' => 1, 'deny_attribute' => 'style, width, height, class, id', 'comment' => 1, 'cdata' => 1, 'balance' => 0);
		$res = htmLawed($res, $config);

		if (get_pref($link, "STRIP_IMAGES", $owner)) {
			$res = preg_replace('/<img[^>]+>/is', '', $res);
		}

		if (strpos($res, "href=") === false)
			$res = rewrite_urls($res);

		$charset_hack = '<head>
			<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
		</head>';

		$res = trim($res); if (!$res) return '';

		libxml_use_internal_errors(true);

		$doc = new DOMDocument();
		$doc->loadHTML($charset_hack . $res);
		$xpath = new DOMXPath($doc);

		$entries = $xpath->query('(//a[@href]|//img[@src])');
		$br_inserted = 0;

		foreach ($entries as $entry) {

			if ($site_url) {

				if ($entry->hasAttribute('href'))
					$entry->setAttribute('href',
						rewrite_relative_url($site_url, $entry->getAttribute('href')));

				if ($entry->hasAttribute('src'))
					if (preg_match('/^image.php\?i=[a-z0-9]+$/', $entry->getAttribute('src')) == 0)
						$entry->setAttribute('src',
							rewrite_relative_url($site_url, $entry->getAttribute('src')));
			}

			if (strtolower($entry->nodeName) == "a") {
				$entry->setAttribute("target", "_blank");
			}

			if (strtolower($entry->nodeName) == "img" && !$br_inserted) {
				$br = $doc->createElement("br");

				if ($entry->parentNode->nextSibling) {
					$entry->parentNode->insertBefore($br, $entry->nextSibling);
					$br_inserted = 1;
				}

			}
		}

		$node = $doc->getElementsByTagName('body')->item(0);

		// http://tt-rss.org/redmine/issues/357
		return $doc->saveXML($node, LIBXML_NOEMPTYTAG);
	}

	function check_for_update($link) {
		if (CHECK_FOR_NEW_VERSION && $_SESSION['access_level'] >= 10) {
			$version_url = "http://tt-rss.org/version.php?ver=" . VERSION;

			$version_data = @fetch_file_contents($version_url);

			if ($version_data) {
				$version_data = json_decode($version_data, true);
				if ($version_data && $version_data['version']) {

					if (version_compare(VERSION, $version_data['version']) == -1) {
						return $version_data;
					}
				}
			}
		}
		return false;
	}

	function catchupArticlesById($link, $ids, $cmode, $owner_uid = false) {

		if (!$owner_uid) $owner_uid = $_SESSION["uid"];
		if (count($ids) == 0) return;

		$tmp_ids = array();

		foreach ($ids as $id) {
			array_push($tmp_ids, "ref_id = '$id'");
		}

		$ids_qpart = join(" OR ", $tmp_ids);

		if ($cmode == 0) {
			db_query($link, "UPDATE ttrss_user_entries SET
			unread = false,last_read = NOW()
			WHERE ($ids_qpart) AND owner_uid = $owner_uid");
		} else if ($cmode == 1) {
			db_query($link, "UPDATE ttrss_user_entries SET
			unread = true
			WHERE ($ids_qpart) AND owner_uid = $owner_uid");
		} else {
			db_query($link, "UPDATE ttrss_user_entries SET
			unread = NOT unread,last_read = NOW()
			WHERE ($ids_qpart) AND owner_uid = $owner_uid");
		}

		/* update ccache */

		$result = db_query($link, "SELECT DISTINCT feed_id FROM ttrss_user_entries
			WHERE ($ids_qpart) AND owner_uid = $owner_uid");

		while ($line = db_fetch_assoc($result)) {
			ccache_update($link, $line["feed_id"], $owner_uid);
		}
	}

	function get_article_tags($link, $id, $owner_uid = 0, $tag_cache = false) {

		$a_id = db_escape_string($id);

		if (!$owner_uid) $owner_uid = $_SESSION["uid"];

		$query = "SELECT DISTINCT tag_name,
			owner_uid as owner FROM
			ttrss_tags WHERE post_int_id = (SELECT int_id FROM ttrss_user_entries WHERE
			ref_id = '$a_id' AND owner_uid = '$owner_uid' LIMIT 1) ORDER BY tag_name";

		$obj_id = md5("TAGS:$owner_uid:$id");
		$tags = array();

		/* check cache first */

		if ($tag_cache === false) {
			$result = db_query($link, "SELECT tag_cache FROM ttrss_user_entries
				WHERE ref_id = '$id' AND owner_uid = $owner_uid");

			$tag_cache = db_fetch_result($result, 0, "tag_cache");
		}

		if ($tag_cache) {
			$tags = explode(",", $tag_cache);
		} else {

			/* do it the hard way */

			$tmp_result = db_query($link, $query);

			while ($tmp_line = db_fetch_assoc($tmp_result)) {
				array_push($tags, $tmp_line["tag_name"]);
			}

			/* update the cache */

			$tags_str = db_escape_string(join(",", $tags));

			db_query($link, "UPDATE ttrss_user_entries
				SET tag_cache = '$tags_str' WHERE ref_id = '$id'
				AND owner_uid = $owner_uid");
		}

		return $tags;
	}

	function trim_array($array) {
		$tmp = $array;
		array_walk($tmp, 'trim');
		return $tmp;
	}

	function tag_is_valid($tag) {
		if ($tag == '') return false;
		if (preg_match("/^[0-9]*$/", $tag)) return false;
		if (mb_strlen($tag) > 250) return false;

		if (function_exists('iconv')) {
			$tag = iconv("utf-8", "utf-8", $tag);
		}

		if (!$tag) return false;

		return true;
	}

	function render_login_form($link, $form_id = 0) {
		switch ($form_id) {
		case 0:
			require_once "login_form.php";
			break;
		case 1:
			require_once "mobile/login_form.php";
			break;
		}
		exit;
	}

	// from http://developer.apple.com/internet/safari/faq.html
	function no_cache_incantation() {
		header("Expires: Mon, 22 Dec 1980 00:00:00 GMT"); // Happy birthday to me :)
		header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); // always modified
		header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0"); // HTTP/1.1
		header("Cache-Control: post-check=0, pre-check=0", false);
		header("Pragma: no-cache"); // HTTP/1.0
	}

	function format_warning($msg, $id = "") {
		global $link;
		return "<div class=\"warning\" id=\"$id\">
			<img src=\"".theme_image($link, "images/sign_excl.svg")."\">$msg</div>";
	}

	function format_notice($msg, $id = "") {
		global $link;
		return "<div class=\"notice\" id=\"$id\">
			<img src=\"".theme_image($link, "images/sign_info.svg")."\">$msg</div>";
	}

	function format_error($msg, $id = "") {
		global $link;
		return "<div class=\"error\" id=\"$id\">
			<img src=\"".theme_image($link, "images/sign_excl.svg")."\">$msg</div>";
	}

	function print_notice($msg) {
		return print format_notice($msg);
	}

	function print_warning($msg) {
		return print format_warning($msg);
	}

	function print_error($msg) {
		return print format_error($msg);
	}


	function T_sprintf() {
		$args = func_get_args();
		return vsprintf(__(array_shift($args)), $args);
	}

	function format_inline_player($link, $url, $ctype) {

		$entry = "";

		if (strpos($ctype, "audio/") === 0) {

			if ($_SESSION["hasAudio"] && (strpos($ctype, "ogg") !== false ||
				strpos($_SERVER['HTTP_USER_AGENT'], "Chrome") !== false ||
				strpos($_SERVER['HTTP_USER_AGENT'], "Safari") !== false )) {

				$id = 'AUDIO-' . uniqid();

				$entry .= "<audio id=\"$id\"\" controls>
					<source type=\"$ctype\" src=\"$url\"></source>
					</audio>";

				$entry .= "<span onclick=\"player(this)\"
					title=\"".__("Click to play")."\" status=\"0\"
					class=\"player\" audio-id=\"$id\">".__("Play")."</span>";

			} else {

				$entry .= "<object type=\"application/x-shockwave-flash\"
					data=\"lib/button/musicplayer.swf?song_url=$url\"
					width=\"17\" height=\"17\" style='float : left; margin-right : 5px;'>
					<param name=\"movie\"
						value=\"lib/button/musicplayer.swf?song_url=$url\" />
					</object>";
			}

			if ($entry) $entry .= "&nbsp;" . basename($url);

			return $entry;

		}

		return "";

/*		$filename = substr($url, strrpos($url, "/")+1);

		$entry .= " <a target=\"_blank\" href=\"" . htmlspecialchars($url) . "\">" .
			$filename . " (" . $ctype . ")" . "</a>"; */

	}

	function format_article($link, $id, $mark_as_read = true, $zoom_mode = false, $owner_uid = false) {
		if (!$owner_uid) $owner_uid = $_SESSION["uid"];

		$rv = array();

		$rv['id'] = $id;

		/* we can figure out feed_id from article id anyway, why do we
		 * pass feed_id here? let's ignore the argument :( */

		$result = db_query($link, "SELECT feed_id FROM ttrss_user_entries
			WHERE ref_id = '$id'");

		$feed_id = (int) db_fetch_result($result, 0, "feed_id");

		$rv['feed_id'] = $feed_id;

		//if (!$zoom_mode) { print "<article id='$id'><![CDATA["; };

		$result = db_query($link, "SELECT rtl_content, always_display_enclosures, cache_content FROM ttrss_feeds
			WHERE id = '$feed_id' AND owner_uid = $owner_uid");

		if (db_num_rows($result) == 1) {
			$rtl_content = sql_bool_to_bool(db_fetch_result($result, 0, "rtl_content"));
			$always_display_enclosures = sql_bool_to_bool(db_fetch_result($result, 0, "always_display_enclosures"));
			$cache_content = sql_bool_to_bool(db_fetch_result($result, 0, "cache_content"));
		} else {
			$rtl_content = false;
			$always_display_enclosures = false;
			$cache_content = false;
		}

		if ($rtl_content) {
			$rtl_tag = "dir=\"RTL\"";
			$rtl_class = "RTL";
		} else {
			$rtl_tag = "";
			$rtl_class = "";
		}

		if ($mark_as_read) {
			$result = db_query($link, "UPDATE ttrss_user_entries
				SET unread = false,last_read = NOW()
				WHERE ref_id = '$id' AND owner_uid = $owner_uid");

			ccache_update($link, $feed_id, $owner_uid);
		}

		$result = db_query($link, "SELECT id,title,link,content,feed_id,comments,int_id,
			".SUBSTRING_FOR_DATE."(updated,1,16) as updated,
			(SELECT site_url FROM ttrss_feeds WHERE id = feed_id) as site_url,
			num_comments,
			tag_cache,
			author,
			orig_feed_id,
			note,
			cached_content
			FROM ttrss_entries,ttrss_user_entries
			WHERE	id = '$id' AND ref_id = id AND owner_uid = $owner_uid");

		if ($result) {

			$line = db_fetch_assoc($result);

			$tag_cache = $line["tag_cache"];

			$line["tags"] = get_article_tags($link, $id, $owner_uid, $line["tag_cache"]);
			unset($line["tag_cache"]);

			$line["content"] = sanitize($link, $line["content"], false, $owner_uid,	$line["site_url"]);

			global $pluginhost;

			foreach ($pluginhost->get_hooks($pluginhost::HOOK_RENDER_ARTICLE) as $p) {
				$line = $p->hook_render_article($line);
			}

			$num_comments = $line["num_comments"];
			$entry_comments = "";

			if ($num_comments > 0) {
				if ($line["comments"]) {
					$comments_url = htmlspecialchars($line["comments"]);
				} else {
					$comments_url = htmlspecialchars($line["link"]);
				}
				$entry_comments = "<a target='_blank' href=\"$comments_url\">$num_comments comments</a>";
			} else {
				if ($line["comments"] && $line["link"] != $line["comments"]) {
					$entry_comments = "<a target='_blank' href=\"".htmlspecialchars($line["comments"])."\">comments</a>";
				}
			}

			if ($zoom_mode) {
				header("Content-Type: text/html");
				$rv['content'] .= "<html><head>
						<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\"/>
						<title>Tiny Tiny RSS - ".$line["title"]."</title>
						<link rel=\"stylesheet\" type=\"text/css\" href=\"tt-rss.css\">
					</head><body>";
			}

			$title_escaped = htmlspecialchars($line['title']);

			$rv['content'] .= "<div id=\"PTITLE-FULL-$id\" style=\"display : none\">" .
				strip_tags($line['title']) . "</div>";

			$rv['content'] .= "<div class=\"postReply\" id=\"POST-$id\">";

			$rv['content'] .= "<div class=\"postHeader\" id=\"POSTHDR-$id\">";

			$entry_author = $line["author"];

			if ($entry_author) {
				$entry_author = __(" - ") . $entry_author;
			}

			$parsed_updated = make_local_datetime($link, $line["updated"], true,
				$owner_uid, true);

			$rv['content'] .= "<div class=\"postDate$rtl_class\">$parsed_updated</div>";

			if ($line["link"]) {
				$rv['content'] .= "<div class='postTitle'><a target='_blank'
					title=\"".htmlspecialchars($line['title'])."\"
					href=\"" .
					htmlspecialchars($line["link"]) . "\">" .
					$line["title"] .
					"<span class='author'>$entry_author</span></a></div>";
			} else {
				$rv['content'] .= "<div class='postTitle'>" . $line["title"] . "$entry_author</div>";
			}

			$tags_str = format_tags_string($line["tags"], $id);
			$tags_str_full = join(", ", $line["tags"]);

			if (!$tags_str_full) $tags_str_full = __("no tags");

			if (!$entry_comments) $entry_comments = "&nbsp;"; # placeholder

			$rv['content'] .= "<div class='postTags' style='float : right'>
				<img src='".theme_image($link, 'images/tag.png')."'
				class='tagsPic' alt='Tags' title='Tags'>&nbsp;";

			if (!$zoom_mode) {
				$rv['content'] .= "<span id=\"ATSTR-$id\">$tags_str</span>
					<a title=\"".__('Edit tags for this article')."\"
					href=\"#\" onclick=\"editArticleTags($id, $feed_id)\">(+)</a>";

				$rv['content'] .= "<div dojoType=\"dijit.Tooltip\"
					id=\"ATSTRTIP-$id\" connectId=\"ATSTR-$id\"
					position=\"below\">$tags_str_full</div>";

				global $pluginhost;

				foreach ($pluginhost->get_hooks($pluginhost::HOOK_ARTICLE_BUTTON) as $p) {
					$rv['content'] .= $p->hook_article_button($line);
				}


			} else {
				$tags_str = strip_tags($tags_str);
				$rv['content'] .= "<span id=\"ATSTR-$id\">$tags_str</span>";
			}
			$rv['content'] .= "</div>";
			$rv['content'] .= "<div clear='both'>$entry_comments</div>";

			if ($line["orig_feed_id"]) {

				$tmp_result = db_query($link, "SELECT * FROM ttrss_archived_feeds
					WHERE id = ".$line["orig_feed_id"]);

				if (db_num_rows($tmp_result) != 0) {

					$rv['content'] .= "<div clear='both'>";
					$rv['content'] .= __("Originally from:");

					$rv['content'] .= "&nbsp;";

					$tmp_line = db_fetch_assoc($tmp_result);

					$rv['content'] .= "<a target='_blank'
						href=' " . htmlspecialchars($tmp_line['site_url']) . "'>" .
						$tmp_line['title'] . "</a>";

					$rv['content'] .= "&nbsp;";

					$rv['content'] .= "<a target='_blank' href='" . htmlspecialchars($tmp_line['feed_url']) . "'>";
					$rv['content'] .= "<img title='".__('Feed URL')."'class='tinyFeedIcon' src='images/pub_set.svg'></a>";

					$rv['content'] .= "</div>";
				}
			}

			$rv['content'] .= "</div>";

			$rv['content'] .= "<div id=\"POSTNOTE-$id\">";
				if ($line['note']) {
					$rv['content'] .= format_article_note($id, $line['note'], !$zoom_mode);
				}
			$rv['content'] .= "</div>";

			$rv['content'] .= "<div class=\"postContent\">";

			// N-grams

			if (DB_TYPE == "pgsql" and defined('_NGRAM_TITLE_RELATED_THRESHOLD')) {

				$ngram_result = db_query($link, "SELECT id,title FROM
						ttrss_entries,ttrss_user_entries
					WHERE ref_id = id AND updated >= NOW() - INTERVAL '7 day'
						AND similarity(title, '$title_escaped') >= "._NGRAM_TITLE_RELATED_THRESHOLD."
						AND title != '$title_escaped'
						AND owner_uid = $owner_uid");

				if (db_num_rows($ngram_result) > 0) {
					$rv['content'] .= "<div dojoType=\"dijit.form.DropDownButton\">".
						"<span>" . __('Related')."</span>";
					$rv['content'] .= "<div dojoType=\"dijit.Menu\" style=\"display: none;\">";

					while ($nline = db_fetch_assoc($ngram_result)) {
						$rv['content'] .= "<div onclick=\"hlOpenInNewTab(null,".$nline['id'].")\"
							dojoType=\"dijit.MenuItem\">".$nline['title']."</div>";

					}
					$rv['content'] .= "</div></div><br/";
				}
			}

			if ($cache_content && $line["cached_content"] != "") {
				$line["content"] =& $line["cached_content"];
			}

			$rv['content'] .= $line["content"];

			$rv['content'] .= format_article_enclosures($link, $id,
				$always_display_enclosures, $line["content"]);

			$rv['content'] .= "</div>";

			$rv['content'] .= "</div>";

		}

		if ($zoom_mode) {
			$rv['content'] .= "
				<div style=\"text-align : center\">
				<button onclick=\"return window.close()\">".
					__("Close this window")."</button></div>";
			$rv['content'] .= "</body></html>";
		}

		return $rv;

	}

	function print_checkpoint($n, $s) {
		$ts = getmicrotime();
		echo sprintf("<!-- CP[$n] %.4f seconds -->", $ts - $s);
		return $ts;
	}

	function sanitize_tag($tag) {
		$tag = trim($tag);

		$tag = mb_strtolower($tag, 'utf-8');

		$tag = preg_replace('/[\'\"\+\>\<]/', "", $tag);

//		$tag = str_replace('"', "", $tag);
//		$tag = str_replace("+", " ", $tag);
		$tag = str_replace("technorati tag: ", "", $tag);

		return $tag;
	}

	function get_self_url_prefix() {
		if (strrpos(SELF_URL_PATH, "/") === strlen(SELF_URL_PATH)-1) {
			return substr(SELF_URL_PATH, 0, strlen(SELF_URL_PATH)-1);
		} else {
			return SELF_URL_PATH;
		}
	}

	/**
	 * Compute the Mozilla Firefox feed adding URL from server HOST and REQUEST_URI.
	 *
	 * @return string The Mozilla Firefox feed adding URL.
	 */
	function add_feed_url() {
		//$url_path = ($_SERVER['HTTPS'] != "on" ? 'http://' :  'https://') . $_SERVER["HTTP_HOST"] . parse_url($_SERVER["REQUEST_URI"], PHP_URL_PATH);

		$url_path = get_self_url_prefix() .
			"/public.php?op=subscribe&feed_url=%s";
		return $url_path;
	} // function add_feed_url

	function encrypt_password($pass, $salt = '', $mode2 = false) {
		if ($salt && $mode2) {
			return "MODE2:" . hash('sha256', $salt . $pass);
		} else if ($salt) {
			return "SHA1X:" . sha1("$salt:$pass");
		} else {
			return "SHA1:" . sha1($pass);
		}
	} // function encrypt_password

	function load_filters($link, $feed_id, $owner_uid, $action_id = false) {
		$filters = array();

		$cat_id = (int)getFeedCategory($link, $feed_id);

		$result = db_query($link, "SELECT * FROM ttrss_filters2 WHERE
			owner_uid = $owner_uid AND enabled = true");

		$check_cats = join(",", array_merge(
			getParentCategories($link, $cat_id, $owner_uid),
			array($cat_id)));

		while ($line = db_fetch_assoc($result)) {
			$filter_id = $line["id"];

			$result2 = db_query($link, "SELECT
				r.reg_exp, r.feed_id, r.cat_id, r.cat_filter, t.name AS type_name
				FROM ttrss_filters2_rules AS r,
				ttrss_filter_types AS t
				WHERE
					(cat_id IS NULL OR cat_id IN ($check_cats)) AND
					(feed_id IS NULL OR feed_id = '$feed_id') AND
					filter_type = t.id AND filter_id = '$filter_id'");

			$rules = array();
			$actions = array();

			while ($rule_line = db_fetch_assoc($result2)) {
#				print_r($rule_line);

				$rule = array();
				$rule["reg_exp"] = $rule_line["reg_exp"];
				$rule["type"] = $rule_line["type_name"];

				array_push($rules, $rule);
			}

			$result2 = db_query($link, "SELECT a.action_param,t.name AS type_name
				FROM ttrss_filters2_actions AS a,
				ttrss_filter_actions AS t
				WHERE
					action_id = t.id AND filter_id = '$filter_id'");

			while ($action_line = db_fetch_assoc($result2)) {
#				print_r($action_line);

				$action = array();
				$action["type"] = $action_line["type_name"];
				$action["param"] = $action_line["action_param"];

				array_push($actions, $action);
			}


			$filter = array();
			$filter["match_any_rule"] = sql_bool_to_bool($line["match_any_rule"]);
			$filter["rules"] = $rules;
			$filter["actions"] = $actions;

			if (count($rules) > 0 && count($actions) > 0) {
				array_push($filters, $filter);
			}
		}

		return $filters;
	}

	function get_score_pic($score) {
		if ($score > 100) {
			return "score_high.png";
		} else if ($score > 0) {
			return "score_half_high.png";
		} else if ($score < -100) {
			return "score_low.png";
		} else if ($score < 0) {
			return "score_half_low.png";
		} else {
			return "score_neutral.png";
		}
	}

	function feed_has_icon($id) {
		return is_file(ICONS_DIR . "/$id.ico") && filesize(ICONS_DIR . "/$id.ico") > 0;
	}

	function init_connection($link) {
		if ($link) {

			if (DB_TYPE == "pgsql") {
				pg_query($link, "set client_encoding = 'UTF-8'");
				pg_set_client_encoding("UNICODE");
				pg_query($link, "set datestyle = 'ISO, european'");
				pg_query($link, "set TIME ZONE 0");
			} else {
				db_query($link, "SET time_zone = '+0:0'");

				if (defined('MYSQL_CHARSET') && MYSQL_CHARSET) {
					db_query($link, "SET NAMES " . MYSQL_CHARSET);
				}
			}

			global $pluginhost;

			$pluginhost = new PluginHost($link);
			$pluginhost->load(PLUGINS, $pluginhost::KIND_ALL);

			return true;
		} else {
			print "Unable to connect to database:" . db_last_error();
			return false;
		}
	}

	function format_tags_string($tags, $id) {

		$tags_str = "";
		$tags_nolinks_str = "";

		$num_tags = 0;

		$tag_limit = 6;

		$formatted_tags = array();

		foreach ($tags as $tag) {
			$num_tags++;
			$tag_escaped = str_replace("'", "\\'", $tag);

			if (mb_strlen($tag) > 30) {
				$tag = truncate_string($tag, 30);
			}

			$tag_str = "<a href=\"javascript:viewfeed('$tag_escaped')\">$tag</a>";

			array_push($formatted_tags, $tag_str);

			$tmp_tags_str = implode(", ", $formatted_tags);

			if ($num_tags == $tag_limit || mb_strlen($tmp_tags_str) > 150) {
				break;
			}
		}

		$tags_str = implode(", ", $formatted_tags);

		if ($num_tags < count($tags)) {
			$tags_str .= ", &hellip;";
		}

		if ($num_tags == 0) {
			$tags_str = __("no tags");
		}

		return $tags_str;

	}

	function format_article_labels($labels, $id) {

		$labels_str = "";

		foreach ($labels as $l) {
			$labels_str .= sprintf("<span class='hlLabelRef'
				style='color : %s; background-color : %s'>%s</span>",
					$l[2], $l[3], $l[1]);
			}

		return $labels_str;

	}

	function format_article_note($id, $note, $allow_edit = true) {

		$str = "<div class='articleNote'	onclick=\"editArticleNote($id)\">
			<div class='noteEdit' onclick=\"editArticleNote($id)\">".
			($allow_edit ? __('(edit note)') : "")."</div>$note</div>";

		return $str;
	}

	function toggle_collapse_cat($link, $cat_id, $mode) {
		if ($cat_id > 0) {
			$mode = bool_to_sql_bool($mode);

			db_query($link, "UPDATE ttrss_feed_categories SET
				collapsed = $mode WHERE id = '$cat_id' AND owner_uid = " .
				$_SESSION["uid"]);
		} else {
			$pref_name = '';

			switch ($cat_id) {
			case -1:
				$pref_name = '_COLLAPSED_SPECIAL';
				break;
			case -2:
				$pref_name = '_COLLAPSED_LABELS';
				break;
			case 0:
				$pref_name = '_COLLAPSED_UNCAT';
				break;
			}

			if ($pref_name) {
				if ($mode) {
					set_pref($link, $pref_name, 'true');
				} else {
					set_pref($link, $pref_name, 'false');
				}
			}
		}
	}


	function get_feed_category($link, $feed_cat, $parent_cat_id = false) {
		if ($parent_cat_id) {
			$parent_qpart = "parent_cat = '$parent_cat_id'";
			$parent_insert = "'$parent_cat_id'";
		} else {
			$parent_qpart = "parent_cat IS NULL";
			$parent_insert = "NULL";
		}

		$result = db_query($link,
			"SELECT id FROM ttrss_feed_categories
			WHERE $parent_qpart AND title = '$feed_cat' AND owner_uid = ".$_SESSION["uid"]);

		if (db_num_rows($result) == 0) {
			return false;
		} else {
			return db_fetch_result($result, 0, "id");
		}
	}

	function add_feed_category($link, $feed_cat, $parent_cat_id = false) {

		if (!$feed_cat) return false;

		db_query($link, "BEGIN");

		if ($parent_cat_id) {
			$parent_qpart = "parent_cat = '$parent_cat_id'";
			$parent_insert = "'$parent_cat_id'";
		} else {
			$parent_qpart = "parent_cat IS NULL";
			$parent_insert = "NULL";
		}

		$result = db_query($link,
			"SELECT id FROM ttrss_feed_categories
			WHERE $parent_qpart AND title = '$feed_cat' AND owner_uid = ".$_SESSION["uid"]);

		if (db_num_rows($result) == 0) {

			$result = db_query($link,
				"INSERT INTO ttrss_feed_categories (owner_uid,title,parent_cat)
				VALUES ('".$_SESSION["uid"]."', '$feed_cat', $parent_insert)");

			db_query($link, "COMMIT");

			return true;
		}

		return false;
	}

	function getArticleFeed($link, $id) {
		$result = db_query($link, "SELECT feed_id FROM ttrss_user_entries
			WHERE ref_id = '$id' AND owner_uid = " . $_SESSION["uid"]);

		if (db_num_rows($result) != 0) {
			return db_fetch_result($result, 0, "feed_id");
		} else {
			return 0;
		}
	}

	/**
	 * Fixes incomplete URLs by prepending "http://".
	 * Also replaces feed:// with http://, and
	 * prepends a trailing slash if the url is a domain name only.
	 *
	 * @param string $url Possibly incomplete URL
	 *
	 * @return string Fixed URL.
	 */
	function fix_url($url) {
		if (strpos($url, '://') === false) {
			$url = 'http://' . $url;
		} else if (substr($url, 0, 5) == 'feed:') {
			$url = 'http:' . substr($url, 5);
		}

		//prepend slash if the URL has no slash in it
		// "http://www.example" -> "http://www.example/"
		if (strpos($url, '/', strpos($url, ':') + 3) === false) {
			$url .= '/';
		}

		if ($url != "http:///")
			return $url;
		else
			return '';
	}

	function validate_feed_url($url) {
		$parts = parse_url($url);

		return ($parts['scheme'] == 'http' || $parts['scheme'] == 'feed' || $parts['scheme'] == 'https');

	}

	function get_article_enclosures($link, $id) {

		$query = "SELECT * FROM ttrss_enclosures
			WHERE post_id = '$id' AND content_url != ''";

		$rv = array();

		$result = db_query($link, $query);

		if (db_num_rows($result) > 0) {
			while ($line = db_fetch_assoc($result)) {
				array_push($rv, $line);
			}
		}

		return $rv;
	}

	function save_email_address($link, $email) {
		// FIXME: implement persistent storage of emails

		if (!$_SESSION['stored_emails'])
			$_SESSION['stored_emails'] = array();

		if (!in_array($email, $_SESSION['stored_emails']))
			array_push($_SESSION['stored_emails'], $email);
	}


	function get_feed_access_key($link, $feed_id, $is_cat, $owner_uid = false) {

		if (!$owner_uid) $owner_uid = $_SESSION["uid"];

		$sql_is_cat = bool_to_sql_bool($is_cat);

		$result = db_query($link, "SELECT access_key FROM ttrss_access_keys
			WHERE feed_id = '$feed_id'	AND is_cat = $sql_is_cat
			AND owner_uid = " . $owner_uid);

		if (db_num_rows($result) == 1) {
			return db_fetch_result($result, 0, "access_key");
		} else {
			$key = db_escape_string(sha1(uniqid(rand(), true)));

			$result = db_query($link, "INSERT INTO ttrss_access_keys
				(access_key, feed_id, is_cat, owner_uid)
				VALUES ('$key', '$feed_id', $sql_is_cat, '$owner_uid')");

			return $key;
		}
		return false;
	}

	function get_feeds_from_html($url, $content)
	{
		$url     = fix_url($url);
		$baseUrl = substr($url, 0, strrpos($url, '/') + 1);

		libxml_use_internal_errors(true);

		$doc = new DOMDocument();
		$doc->loadHTML($content);
		$xpath = new DOMXPath($doc);
		$entries = $xpath->query('/html/head/link[@rel="alternate"]');
		$feedUrls = array();
		foreach ($entries as $entry) {
			if ($entry->hasAttribute('href')) {
				$title = $entry->getAttribute('title');
				if ($title == '') {
					$title = $entry->getAttribute('type');
				}
				$feedUrl = rewrite_relative_url(
					$baseUrl, $entry->getAttribute('href')
				);
				$feedUrls[$feedUrl] = $title;
			}
		}
		return $feedUrls;
	}

	function is_html($content) {
		return preg_match("/<html|DOCTYPE html/i", substr($content, 0, 20)) !== 0;
	}

	function url_is_html($url, $login = false, $pass = false) {
		return is_html(fetch_file_contents($url, false, $login, $pass));
	}

	function print_label_select($link, $name, $value, $attributes = "") {

		$result = db_query($link, "SELECT caption FROM ttrss_labels2
			WHERE owner_uid = '".$_SESSION["uid"]."' ORDER BY caption");

		print "<select default=\"$value\" name=\"" . htmlspecialchars($name) .
			"\" $attributes onchange=\"labelSelectOnChange(this)\" >";

		while ($line = db_fetch_assoc($result)) {

			$issel = ($line["caption"] == $value) ? "selected=\"1\"" : "";

			print "<option value=\"".htmlspecialchars($line["caption"])."\"
				$issel>" . htmlspecialchars($line["caption"]) . "</option>";

		}

#		print "<option value=\"ADD_LABEL\">" .__("Add label...") . "</option>";

		print "</select>";


	}

	function format_article_enclosures($link, $id, $always_display_enclosures,
					$article_content) {

		$result = get_article_enclosures($link, $id);
		$rv = '';

		if (count($result) > 0) {

			$entries_html = array();
			$entries = array();
			$entries_inline = array();

			foreach ($result as $line) {

				$url = $line["content_url"];
				$ctype = $line["content_type"];

				if (!$ctype) $ctype = __("unknown type");

				$filename = substr($url, strrpos($url, "/")+1);

				$player = format_inline_player($link, $url, $ctype);

				if ($player) array_push($entries_inline, $player);

#				$entry .= " <a target=\"_blank\" href=\"" . htmlspecialchars($url) . "\">" .
#					$filename . " (" . $ctype . ")" . "</a>";

				$entry = "<div onclick=\"window.open('".htmlspecialchars($url)."')\"
					dojoType=\"dijit.MenuItem\">$filename ($ctype)</div>";

				array_push($entries_html, $entry);

				$entry = array();

				$entry["type"] = $ctype;
				$entry["filename"] = $filename;
				$entry["url"] = $url;

				array_push($entries, $entry);
			}

			if (!get_pref($link, "STRIP_IMAGES")) {
				if ($always_display_enclosures ||
							!preg_match("/<img/i", $article_content)) {

					foreach ($entries as $entry) {

						if (preg_match("/image/", $entry["type"]) ||
								preg_match("/\.(jpg|png|gif|bmp)/i", $entry["filename"])) {

								$rv .= "<p><img
								alt=\"".htmlspecialchars($entry["filename"])."\"
								src=\"" .htmlspecialchars($entry["url"]) . "\"/></p>";

						}
					}
				}
			}

			if (count($entries_inline) > 0) {
				$rv .= "<hr clear='both'/>";
				foreach ($entries_inline as $entry) { $rv .= $entry; };
				$rv .= "<hr clear='both'/>";
			}

			$rv .= "<br/><div dojoType=\"dijit.form.DropDownButton\">".
				"<span>" . __('Attachments')."</span>";
			$rv .= "<div dojoType=\"dijit.Menu\" style=\"display: none;\">";

			foreach ($entries_html as $entry) { $rv .= $entry; };

			$rv .= "</div></div>";
		}

		return $rv;
	}

	function getLastArticleId($link) {
		$result = db_query($link, "SELECT MAX(ref_id) AS id FROM ttrss_user_entries
			WHERE owner_uid = " . $_SESSION["uid"]);

		if (db_num_rows($result) == 1) {
			return db_fetch_result($result, 0, "id");
		} else {
			return -1;
		}
	}

	function build_url($parts) {
		return $parts['scheme'] . "://" . $parts['host'] . $parts['path'];
	}

	/**
	 * Converts a (possibly) relative URL to a absolute one.
	 *
	 * @param string $url     Base URL (i.e. from where the document is)
	 * @param string $rel_url Possibly relative URL in the document
	 *
	 * @return string Absolute URL
	 */
	function rewrite_relative_url($url, $rel_url) {
		if (strpos($rel_url, "magnet:") === 0) {
			return $rel_url;
		} else if (strpos($rel_url, "://") !== false) {
			return $rel_url;
		} else if (strpos($rel_url, "//") === 0) {
			# protocol-relative URL (rare but they exist)
			return $rel_url;
		} else if (strpos($rel_url, "/") === 0)
		{
			$parts = parse_url($url);
			$parts['path'] = $rel_url;

			return build_url($parts);

		} else {
			$parts = parse_url($url);
			if (!isset($parts['path'])) {
				$parts['path'] = '/';
			}
			$dir = $parts['path'];
			if (substr($dir, -1) !== '/') {
				$dir = dirname($parts['path']);
				$dir !== '/' && $dir .= '/';
			}
			$parts['path'] = $dir . $rel_url;

			return build_url($parts);
		}
	}

	function sphinx_search($query, $offset = 0, $limit = 30) {
		require_once 'lib/sphinxapi.php';

		$sphinxClient = new SphinxClient();

		$sphinxClient->SetServer('localhost', 9312);
		$sphinxClient->SetConnectTimeout(1);

		$sphinxClient->SetFieldWeights(array('title' => 70, 'content' => 30,
			'feed_title' => 20));

		$sphinxClient->SetMatchMode(SPH_MATCH_EXTENDED2);
		$sphinxClient->SetRankingMode(SPH_RANK_PROXIMITY_BM25);
		$sphinxClient->SetLimits($offset, $limit, 1000);
		$sphinxClient->SetArrayResult(false);
		$sphinxClient->SetFilter('owner_uid', array($_SESSION['uid']));

		$result = $sphinxClient->Query($query, SPHINX_INDEX);

		$ids = array();

		if (is_array($result['matches'])) {
			foreach (array_keys($result['matches']) as $int_id) {
				$ref_id = $result['matches'][$int_id]['attrs']['ref_id'];
				array_push($ids, $ref_id);
			}
		}

		return $ids;
	}

	function cleanup_tags($link, $days = 14, $limit = 1000) {

		if (DB_TYPE == "pgsql") {
			$interval_query = "date_updated < NOW() - INTERVAL '$days days'";
		} else if (DB_TYPE == "mysql") {
			$interval_query = "date_updated < DATE_SUB(NOW(), INTERVAL $days DAY)";
		}

		$tags_deleted = 0;

		while ($limit > 0) {
			$limit_part = 500;

			$query = "SELECT ttrss_tags.id AS id
				FROM ttrss_tags, ttrss_user_entries, ttrss_entries
				WHERE post_int_id = int_id AND $interval_query AND
				ref_id = ttrss_entries.id AND tag_cache != '' LIMIT $limit_part";

			$result = db_query($link, $query);

			$ids = array();

			while ($line = db_fetch_assoc($result)) {
				array_push($ids, $line['id']);
			}

			if (count($ids) > 0) {
				$ids = join(",", $ids);
				print ".";

				$tmp_result = db_query($link, "DELETE FROM ttrss_tags WHERE id IN ($ids)");
				$tags_deleted += db_affected_rows($link, $tmp_result);
			} else {
				break;
			}

			$limit -= $limit_part;
		}

		print "\n";

		return $tags_deleted;
	}

	function print_user_stylesheet($link) {
		$value = get_pref($link, 'USER_STYLESHEET');

		if ($value) {
			print "<style type=\"text/css\">";
			print str_replace("<br/>", "\n", $value);
			print "</style>";
		}

	}

	function rewrite_urls($html) {
		libxml_use_internal_errors(true);

		$charset_hack = '<head>
			<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
		</head>';

		$doc = new DOMDocument();
		$doc->loadHTML($charset_hack . $html);
		$xpath = new DOMXPath($doc);

		$entries = $xpath->query('//*/text()');

		foreach ($entries as $entry) {
			if (strstr($entry->wholeText, "://") !== false) {
				$text = preg_replace("/((?<!=.)((http|https|ftp)+):\/\/[^ ,!]+)/i",
					"<a target=\"_blank\" href=\"\\1\">\\1</a>", $entry->wholeText);

				if ($text != $entry->wholeText) {
					$cdoc = new DOMDocument();
					$cdoc->loadHTML($charset_hack . $text);


					foreach ($cdoc->childNodes as $cnode) {
						$cnode = $doc->importNode($cnode, true);

						if ($cnode) {
							$entry->parentNode->insertBefore($cnode);
						}
					}

					$entry->parentNode->removeChild($entry);

				}
			}
		}

		$node = $doc->getElementsByTagName('body')->item(0);

		// http://tt-rss.org/forum/viewtopic.php?f=1&t=970
		if ($node)
			return $doc->saveXML($node, LIBXML_NOEMPTYTAG);
		else
			return $html;
	}

	function filter_to_sql($link, $filter, $owner_uid) {
		$query = array();

		if (DB_TYPE == "pgsql")
			$reg_qpart = "~";
		else
			$reg_qpart = "REGEXP";

		foreach ($filter["rules"] AS $rule) {
			$regexp_valid = preg_match('/' . $rule['reg_exp'] . '/',
				$rule['reg_exp']) !== FALSE;

			if ($regexp_valid) {

				$rule['reg_exp'] = db_escape_string($rule['reg_exp']);

				switch ($rule["type"]) {
					case "title":
						$qpart = "LOWER(ttrss_entries.title) $reg_qpart LOWER('".
							$rule['reg_exp'] . "')";
						break;
					case "content":
						$qpart = "LOWER(ttrss_entries.content) $reg_qpart LOWER('".
							$rule['reg_exp'] . "')";
						break;
					case "both":
						$qpart = "LOWER(ttrss_entries.title) $reg_qpart LOWER('".
							$rule['reg_exp'] . "') OR LOWER(" .
							"ttrss_entries.content) $reg_qpart LOWER('" . $rule['reg_exp'] . "')";
						break;
					case "tag":
						$qpart = "LOWER(ttrss_user_entries.tag_cache) $reg_qpart LOWER('".
							$rule['reg_exp'] . "')";
						break;
					case "link":
						$qpart = "LOWER(ttrss_entries.link) $reg_qpart LOWER('".
							$rule['reg_exp'] . "')";
						break;
					case "author":
						$qpart = "LOWER(ttrss_entries.author) $reg_qpart LOWER('".
							$rule['reg_exp'] . "')";
						break;
				}

				if (isset($rule["feed_id"]) && $rule["feed_id"] > 0) {
					$qpart .= " AND feed_id = " . db_escape_string($rule["feed_id"]);
				}

				if (isset($rule["cat_id"])) {

					if ($rule["cat_id"] > 0) {
						$children = getChildCategories($link, $rule["cat_id"], $owner_uid);
						array_push($children, $rule["cat_id"]);

						$children = join(",", $children);

						$cat_qpart = "cat_id IN ($children)";
					} else {
						$cat_qpart = "cat_id IS NULL";
					}

					$qpart .= " AND $cat_qpart";
				}

				array_push($query, "($qpart)");

			}
		}

		if (count($query) > 0) {
			return "(" . join($filter["match_any_rule"] ? "OR" : "AND", $query) . ")";
		} else {
			return "(false)";
		}
	}

	if (!function_exists('gzdecode')) {
		function gzdecode($string) { // no support for 2nd argument
			return file_get_contents('compress.zlib://data:who/cares;base64,'.
				base64_encode($string));
		}
	}

	function get_random_bytes($length) {
		if (function_exists('openssl_random_pseudo_bytes')) {
			return openssl_random_pseudo_bytes($length);
		} else {
			$output = "";

			for ($i = 0; $i < $length; $i++)
				$output .= chr(mt_rand(0, 255));

			return $output;
		}
	}

	function read_stdin() {
		$fp = fopen("php://stdin", "r");

		if ($fp) {
			$line = trim(fgets($fp));
			fclose($fp);
			return $line;
		}

		return null;
	}

	function tmpdirname($path, $prefix) {
		// Use PHP's tmpfile function to create a temporary
		// directory name. Delete the file and keep the name.
		$tempname = tempnam($path,$prefix);
		if (!$tempname)
			return false;

		if (!unlink($tempname))
			return false;

       return $tempname;
	}

	function getFeedCategory($link, $feed) {
		$result = db_query($link, "SELECT cat_id FROM ttrss_feeds
			WHERE id = '$feed'");

		if (db_num_rows($result) > 0) {
			return db_fetch_result($result, 0, "cat_id");
		} else {
			return false;
		}

	}

	function implements_interface($class, $interface) {
		return in_array($interface, class_implements($class));
	}

?>