- Framework refactoring (I hope it's the last one):

  rcube,rcmail,rcube_ui -> rcube,rcmail,rcube_utils
  renamed main.inc into rcube_bc.inc

1 files changed, 793 insertions, 0 deletions

diff --git a/program/include/rcube_utils.php b/program/include/rcube_utils.php
new file mode 100644
index 000000000..663adb68e
--- /dev/null
+++ b/program/include/rcube_utils.php
@@ -0,0 +1,793 @@
+<?php
+
+/*
+ +-----------------------------------------------------------------------+
+ | program/include/rcube_utils.php                                       |
+ |                                                                       |
+ | This file is part of the Roundcube Webmail client                     |
+ | Copyright (C) 2008-2012, The Roundcube Dev Team                       |
+ | Copyright (C) 2011-2012, Kolab Systems AG                             |
+ |                                                                       |
+ | Licensed under the GNU General Public License version 3 or            |
+ | any later version with exceptions for skins & plugins.                |
+ | See the README file for a full license statement.                     |
+ |                                                                       |
+ | PURPOSE:                                                              |
+ |   Utility class providing common functions                            |
+ +-----------------------------------------------------------------------+
+ | Author: Thomas Bruederli <roundcube@gmail.com>                        |
+ | Author: Aleksander Machniak <alec@alec.pl>                            |
+ +-----------------------------------------------------------------------+
+
+ $Id$
+
+*/
+
+
+/**
+ * Utility class providing common functions
+ *
+ * @package Core
+ */
+class rcube_utils
+{
+    // define constants for input reading
+    const INPUT_GET  = 0x0101;
+    const INPUT_POST = 0x0102;
+    const INPUT_GPC  = 0x0103;
+
+    /**
+     * Helper method to set a cookie with the current path and host settings
+     *
+     * @param string Cookie name
+     * @param string Cookie value
+     * @param string Expiration time
+     */
+    public static function setcookie($name, $value, $exp = 0)
+    {
+        if (headers_sent()) {
+            return;
+        }
+
+        $cookie = session_get_cookie_params();
+        $secure = self::https_check();
+
+        setcookie($name, $value, $exp, $cookie['path'], $cookie['domain'], $secure, true);
+    }
+
+    /**
+     * E-mail address validation.
+     *
+     * @param string $email Email address
+     * @param boolean $dns_check True to check dns
+     *
+     * @return boolean True on success, False if address is invalid
+     */
+    public static function check_email($email, $dns_check=true)
+    {
+        // Check for invalid characters
+        if (preg_match('/[\x00-\x1F\x7F-\xFF]/', $email)) {
+            return false;
+        }
+
+        // Check for length limit specified by RFC 5321 (#1486453)
+        if (strlen($email) > 254) {
+            return false;
+        }
+
+        $email_array = explode('@', $email);
+
+        // Check that there's one @ symbol
+        if (count($email_array) < 2) {
+            return false;
+        }
+
+        $domain_part = array_pop($email_array);
+        $local_part  = implode('@', $email_array);
+
+        // from PEAR::Validate
+        $regexp = '&^(?:
+	        ("\s*(?:[^"\f\n\r\t\v\b\s]+\s*)+")| 			 	            #1 quoted name
+	        ([-\w!\#\$%\&\'*+~/^`|{}=]+(?:\.[-\w!\#\$%\&\'*+~/^`|{}=]+)*)) 	#2 OR dot-atom (RFC5322)
+	        $&xi';
+
+        if (!preg_match($regexp, $local_part)) {
+            return false;
+        }
+
+        // Check domain part
+        if (preg_match('/^\[*(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])){3}\]*$/', $domain_part)) {
+            return true; // IP address
+        }
+        else {
+            // If not an IP address
+            $domain_array = explode('.', $domain_part);
+            // Not enough parts to be a valid domain
+            if (sizeof($domain_array) < 2) {
+                return false;
+            }
+
+            foreach ($domain_array as $part) {
+                if (!preg_match('/^(([A-Za-z0-9][A-Za-z0-9-]{0,61}[A-Za-z0-9])|([A-Za-z0-9]))$/', $part)) {
+                    return false;
+                }
+            }
+
+            $rcube = rcube::get_instance();
+
+            if (!$dns_check || !$rcube->config->get('email_dns_check')) {
+                return true;
+            }
+
+            if (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN' && version_compare(PHP_VERSION, '5.3.0', '<')) {
+                $lookup = array();
+                @exec("nslookup -type=MX " . escapeshellarg($domain_part) . " 2>&1", $lookup);
+                foreach ($lookup as $line) {
+                    if (strpos($line, 'MX preference')) {
+                        return true;
+                    }
+                }
+                return false;
+            }
+
+            // find MX record(s)
+            if (getmxrr($domain_part, $mx_records)) {
+                return true;
+            }
+
+            // find any DNS record
+            if (checkdnsrr($domain_part, 'ANY')) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Check whether the HTTP referer matches the current request
+     *
+     * @return boolean True if referer is the same host+path, false if not
+     */
+    public static function check_referer()
+    {
+        $uri = parse_url($_SERVER['REQUEST_URI']);
+        $referer = parse_url(rcube_request_header('Referer'));
+        return $referer['host'] == rcube_request_header('Host') && $referer['path'] == $uri['path'];
+    }
+
+
+    /**
+     * Replacing specials characters to a specific encoding type
+     *
+     * @param  string  Input string
+     * @param  string  Encoding type: text|html|xml|js|url
+     * @param  string  Replace mode for tags: show|replace|remove
+     * @param  boolean Convert newlines
+     *
+     * @return string  The quoted string
+     */
+    public static function rep_specialchars_output($str, $enctype = '', $mode = '', $newlines = true)
+    {
+        static $html_encode_arr = false;
+        static $js_rep_table = false;
+        static $xml_rep_table = false;
+
+        // encode for HTML output
+        if ($enctype == 'html') {
+            if (!$html_encode_arr) {
+                $html_encode_arr = get_html_translation_table(HTML_SPECIALCHARS);
+                unset($html_encode_arr['?']);
+            }
+
+            $encode_arr = $html_encode_arr;
+
+            // don't replace quotes and html tags
+            if ($mode == 'show' || $mode == '') {
+                $ltpos = strpos($str, '<');
+                if ($ltpos !== false && strpos($str, '>', $ltpos) !== false) {
+                    unset($encode_arr['"']);
+                    unset($encode_arr['<']);
+                    unset($encode_arr['>']);
+                    unset($encode_arr['&']);
+                }
+            }
+            else if ($mode == 'remove') {
+                $str = strip_tags($str);
+            }
+
+            $out = strtr($str, $encode_arr);
+
+            // avoid douple quotation of &
+            $out = preg_replace('/&amp;([A-Za-z]{2,6}|#[0-9]{2,4});/', '&\\1;', $out);
+
+            return $newlines ? nl2br($out) : $out;
+        }
+
+        // if the replace tables for XML and JS are not yet defined
+        if ($js_rep_table === false) {
+            $js_rep_table = $xml_rep_table = array();
+            $xml_rep_table['&'] = '&amp;';
+
+            // can be increased to support more charsets
+            for ($c=160; $c<256; $c++) {
+                $xml_rep_table[chr($c)] = "&#$c;";
+            }
+
+            $xml_rep_table['"'] = '&quot;';
+            $js_rep_table['"']  = '\\"';
+            $js_rep_table["'"]  = "\\'";
+            $js_rep_table["\\"] = "\\\\";
+            // Unicode line and paragraph separators (#1486310)
+            $js_rep_table[chr(hexdec(E2)).chr(hexdec(80)).chr(hexdec(A8))] = '&#8232;';
+            $js_rep_table[chr(hexdec(E2)).chr(hexdec(80)).chr(hexdec(A9))] = '&#8233;';
+        }
+
+        // encode for javascript use
+        if ($enctype == 'js') {
+            return preg_replace(array("/\r?\n/", "/\r/", '/<\\//'), array('\n', '\n', '<\\/'), strtr($str, $js_rep_table));
+        }
+
+        // encode for plaintext
+        if ($enctype == 'text') {
+            return str_replace("\r\n", "\n", $mode=='remove' ? strip_tags($str) : $str);
+        }
+
+        if ($enctype == 'url') {
+            return rawurlencode($str);
+        }
+
+        // encode for XML
+        if ($enctype == 'xml') {
+            return strtr($str, $xml_rep_table);
+        }
+
+        // no encoding given -> return original string
+        return $str;
+    }
+
+
+    /**
+     * Read input value and convert it for internal use
+     * Performs stripslashes() and charset conversion if necessary
+     *
+     * @param  string   Field name to read
+     * @param  int      Source to get value from (GPC)
+     * @param  boolean  Allow HTML tags in field value
+     * @param  string   Charset to convert into
+     *
+     * @return string   Field value or NULL if not available
+     */
+    public static function get_input_value($fname, $source, $allow_html=FALSE, $charset=NULL)
+    {
+        $value = NULL;
+
+        if ($source == self::INPUT_GET) {
+            if (isset($_GET[$fname])) {
+                $value = $_GET[$fname];
+            }
+        }
+        else if ($source == self::INPUT_POST) {
+            if (isset($_POST[$fname])) {
+                $value = $_POST[$fname];
+            }
+        }
+        else if ($source == self::INPUT_GPC) {
+            if (isset($_POST[$fname])) {
+                $value = $_POST[$fname];
+            }
+            else if (isset($_GET[$fname])) {
+                $value = $_GET[$fname];
+            }
+            else if (isset($_COOKIE[$fname])) {
+                $value = $_COOKIE[$fname];
+            }
+        }
+
+        return self::parse_input_value($value, $allow_html, $charset);
+    }
+
+
+    /**
+     * Parse/validate input value. See self::get_input_value()
+     * Performs stripslashes() and charset conversion if necessary
+     *
+     * @param  string   Input value
+     * @param  boolean  Allow HTML tags in field value
+     * @param  string   Charset to convert into
+     *
+     * @return string   Parsed value
+     */
+    public static function parse_input_value($value, $allow_html=FALSE, $charset=NULL)
+    {
+        global $OUTPUT;
+
+        if (empty($value)) {
+            return $value;
+        }
+
+        if (is_array($value)) {
+            foreach ($value as $idx => $val) {
+                $value[$idx] = self::parse_input_value($val, $allow_html, $charset);
+            }
+            return $value;
+        }
+
+        // strip single quotes if magic_quotes_sybase is enabled
+        if (ini_get('magic_quotes_sybase')) {
+            $value = str_replace("''", "'", $value);
+        }
+        // strip slashes if magic_quotes enabled
+        else if (get_magic_quotes_gpc() || get_magic_quotes_runtime()) {
+            $value = stripslashes($value);
+        }
+
+        // remove HTML tags if not allowed
+        if (!$allow_html) {
+            $value = strip_tags($value);
+        }
+
+        $output_charset = is_object($OUTPUT) ? $OUTPUT->get_charset() : null;
+
+        // remove invalid characters (#1488124)
+        if ($output_charset == 'UTF-8') {
+            $value = rcube_charset::clean($value);
+        }
+
+        // convert to internal charset
+        if ($charset && $output_charset) {
+            $value = rcube_charset::convert($value, $output_charset, $charset);
+        }
+
+        return $value;
+    }
+
+
+    /**
+     * Convert array of request parameters (prefixed with _)
+     * to a regular array with non-prefixed keys.
+     *
+     * @param int    $mode   Source to get value from (GPC)
+     * @param string $ignore PCRE expression to skip parameters by name
+     *
+     * @return array Hash array with all request parameters
+     */
+    public static function request2param($mode = null, $ignore = 'task|action')
+    {
+        $out = array();
+        $src = $mode == self::INPUT_GET ? $_GET : ($mode == self::INPUT_POST ? $_POST : $_REQUEST);
+
+        foreach ($src as $key => $value) {
+            $fname = $key[0] == '_' ? substr($key, 1) : $key;
+            if ($ignore && !preg_match('/^(' . $ignore . ')$/', $fname)) {
+                $out[$fname] = self::get_input_value($key, $mode);
+            }
+        }
+
+        return $out;
+    }
+
+
+    /**
+     * Convert the given string into a valid HTML identifier
+     * Same functionality as done in app.js with rcube_webmail.html_identifier()
+     */
+    public static function html_identifier($str, $encode=false)
+    {
+        if ($encode) {
+            return rtrim(strtr(base64_encode($str), '+/', '-_'), '=');
+        }
+        else {
+            return asciiwords($str, true, '_');
+        }
+    }
+
+
+    /**
+     * Create an edit field for inclusion on a form
+     *
+     * @param string col field name
+     * @param string value field value
+     * @param array attrib HTML element attributes for field
+     * @param string type HTML element type (default 'text')
+     *
+     * @return string HTML field definition
+     */
+    public static function get_edit_field($col, $value, $attrib, $type = 'text')
+    {
+        static $colcounts = array();
+
+        $fname = '_'.$col;
+        $attrib['name']  = $fname . ($attrib['array'] ? '[]' : '');
+        $attrib['class'] = trim($attrib['class'] . ' ff_' . $col);
+
+        if ($type == 'checkbox') {
+            $attrib['value'] = '1';
+            $input = new html_checkbox($attrib);
+        }
+        else if ($type == 'textarea') {
+            $attrib['cols'] = $attrib['size'];
+            $input = new html_textarea($attrib);
+        }
+        else if ($type == 'select') {
+            $input = new html_select($attrib);
+            $input->add('---', '');
+            $input->add(array_values($attrib['options']), array_keys($attrib['options']));
+        }
+        else if ($attrib['type'] == 'password') {
+            $input = new html_passwordfield($attrib);
+        }
+        else {
+            if ($attrib['type'] != 'text' && $attrib['type'] != 'hidden') {
+                $attrib['type'] = 'text';
+            }
+            $input = new html_inputfield($attrib);
+        }
+
+        // use value from post
+        if (isset($_POST[$fname])) {
+            $postvalue = self::get_input_value($fname, self::INPUT_POST, true);
+            $value = $attrib['array'] ? $postvalue[intval($colcounts[$col]++)] : $postvalue;
+        }
+
+        $out = $input->show($value);
+
+        return $out;
+    }
+
+
+    /**
+     * Replace all css definitions with #container [def]
+     * and remove css-inlined scripting
+     *
+     * @param string CSS source code
+     * @param string Container ID to use as prefix
+     *
+     * @return string Modified CSS source
+     */
+    public static function mod_css_styles($source, $container_id, $allow_remote=false)
+    {
+        $last_pos = 0;
+        $replacements = new rcube_string_replacer;
+
+        // ignore the whole block if evil styles are detected
+        $source   = self::xss_entity_decode($source);
+        $stripped = preg_replace('/[^a-z\(:;]/i', '', $source);
+        $evilexpr = 'expression|behavior|javascript:|import[^a]' . (!$allow_remote ? '|url\(' : '');
+        if (preg_match("/$evilexpr/i", $stripped)) {
+            return '/* evil! */';
+        }
+
+        // cut out all contents between { and }
+        while (($pos = strpos($source, '{', $last_pos)) && ($pos2 = strpos($source, '}', $pos))) {
+            $styles = substr($source, $pos+1, $pos2-($pos+1));
+
+            // check every line of a style block...
+            if ($allow_remote) {
+                $a_styles = preg_split('/;[\r\n]*/', $styles, -1, PREG_SPLIT_NO_EMPTY);
+                foreach ($a_styles as $line) {
+                    $stripped = preg_replace('/[^a-z\(:;]/i', '', $line);
+                    // ... and only allow strict url() values
+                    $regexp = '!url\s*\([ "\'](https?:)//[a-z0-9/._+-]+["\' ]\)!Uims';
+                    if (stripos($stripped, 'url(') && !preg_match($regexp, $line)) {
+                        $a_styles = array('/* evil! */');
+                        break;
+                    }
+                }
+                $styles = join(";\n", $a_styles);
+            }
+
+            $key = $replacements->add($styles);
+            $source = substr($source, 0, $pos+1)
+                . $replacements->get_replacement($key)
+                . substr($source, $pos2, strlen($source)-$pos2);
+            $last_pos = $pos+2;
+        }
+
+        // remove html comments and add #container to each tag selector.
+        // also replace body definition because we also stripped off the <body> tag
+        $styles = preg_replace(
+            array(
+                '/(^\s*<!--)|(-->\s*$)/',
+                '/(^\s*|,\s*|\}\s*)([a-z0-9\._#\*][a-z0-9\.\-_]*)/im',
+                '/'.preg_quote($container_id, '/').'\s+body/i',
+            ),
+            array(
+                '',
+                "\\1#$container_id \\2",
+                $container_id,
+            ),
+            $source);
+
+        // put block contents back in
+        $styles = $replacements->resolve($styles);
+
+        return $styles;
+    }
+
+
+    /**
+     * Generate CSS classes from mimetype and filename extension
+     *
+     * @param string $mimetype  Mimetype
+     * @param string $filename  Filename
+     *
+     * @return string CSS classes separated by space
+     */
+    public static function file2class($mimetype, $filename)
+    {
+        list($primary, $secondary) = explode('/', $mimetype);
+
+        $classes = array($primary ? $primary : 'unknown');
+        if ($secondary) {
+            $classes[] = $secondary;
+        }
+        if (preg_match('/\.([a-z0-9]+)$/i', $filename, $m)) {
+            $classes[] = $m[1];
+        }
+
+        return strtolower(join(" ", $classes));
+    }
+
+
+    /**
+     * Decode escaped entities used by known XSS exploits.
+     * See http://downloads.securityfocus.com/vulnerabilities/exploits/26800.eml for examples
+     *
+     * @param string CSS content to decode
+     *
+     * @return string Decoded string
+     */
+    public static function xss_entity_decode($content)
+    {
+        $out = html_entity_decode(html_entity_decode($content));
+        $out = preg_replace_callback('/\\\([0-9a-f]{4})/i',
+            array(self, 'xss_entity_decode_callback'), $out);
+        $out = preg_replace('#/\*.*\*/#Ums', '', $out);
+
+        return $out;
+    }
+
+
+    /**
+     * preg_replace_callback callback for xss_entity_decode
+     *
+     * @param array $matches Result from preg_replace_callback
+     *
+     * @return string Decoded entity
+     */
+    public static function xss_entity_decode_callback($matches)
+    {
+        return chr(hexdec($matches[1]));
+    }
+
+
+    /**
+     * Check if we can process not exceeding memory_limit
+     *
+     * @param integer Required amount of memory
+     *
+     * @return boolean True if memory won't be exceeded, False otherwise
+     */
+    public static function mem_check($need)
+    {
+        $mem_limit = parse_bytes(ini_get('memory_limit'));
+        $memory    = function_exists('memory_get_usage') ? memory_get_usage() : 16*1024*1024; // safe value: 16MB
+
+        return $mem_limit > 0 && $memory + $need > $mem_limit ? false : true;
+    }
+
+
+    /**
+     * Check if working in SSL mode
+     *
+     * @param integer $port      HTTPS port number
+     * @param boolean $use_https Enables 'use_https' option checking
+     *
+     * @return boolean
+     */
+    public static function https_check($port=null, $use_https=true)
+    {
+        global $RCMAIL;
+
+        if (!empty($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) != 'off') {
+            return true;
+        }
+        if (!empty($_SERVER['HTTP_X_FORWARDED_PROTO']) && strtolower($_SERVER['HTTP_X_FORWARDED_PROTO']) == 'https') {
+            return true;
+        }
+        if ($port && $_SERVER['SERVER_PORT'] == $port) {
+            return true;
+        }
+        if ($use_https && isset($RCMAIL) && $RCMAIL->config->get('use_https')) {
+            return true;
+        }
+
+        return false;
+    }
+
+
+    /**
+     * Replaces hostname variables.
+     *
+     * @param string $name Hostname
+     * @param string $host Optional IMAP hostname
+     *
+     * @return string Hostname
+     */
+    public static function parse_host($name, $host = '')
+    {
+        // %n - host
+        $n = preg_replace('/:\d+$/', '', $_SERVER['SERVER_NAME']);
+        // %d - domain name without first part, e.g. %n=mail.domain.tld, %d=domain.tld
+        $d = preg_replace('/^[^\.]+\./', '', $n);
+        // %h - IMAP host
+        $h = $_SESSION['storage_host'] ? $_SESSION['storage_host'] : $host;
+        // %z - IMAP domain without first part, e.g. %h=imap.domain.tld, %z=domain.tld
+        $z = preg_replace('/^[^\.]+\./', '', $h);
+        // %s - domain name after the '@' from e-mail address provided at login screen. Returns FALSE if an invalid email is provided
+        if (strpos($name, '%s') !== false) {
+            $user_email = self::get_input_value('_user', self::INPUT_POST);
+            $user_email = rcube_idn_convert($user_email, true);
+            $matches    = preg_match('/(.*)@([a-z0-9\.\-\[\]\:]+)/i', $user_email, $s);
+            if ($matches < 1 || filter_var($s[1]."@".$s[2], FILTER_VALIDATE_EMAIL) === false) {
+                return false;
+            }
+        }
+
+        $name = str_replace(array('%n', '%d', '%h', '%z', '%s'), array($n, $d, $h, $z, $s[2]), $name);
+        return $name;
+    }
+
+
+    /**
+     * Returns remote IP address and forwarded addresses if found
+     *
+     * @return string Remote IP address(es)
+     */
+    public static function remote_ip()
+    {
+        $address = $_SERVER['REMOTE_ADDR'];
+
+        // append the NGINX X-Real-IP header, if set
+        if (!empty($_SERVER['HTTP_X_REAL_IP'])) {
+            $remote_ip[] = 'X-Real-IP: ' . $_SERVER['HTTP_X_REAL_IP'];
+        }
+        // append the X-Forwarded-For header, if set
+        if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
+            $remote_ip[] = 'X-Forwarded-For: ' . $_SERVER['HTTP_X_FORWARDED_FOR'];
+        }
+
+        if (!empty($remote_ip)) {
+            $address .= '(' . implode(',', $remote_ip) . ')';
+        }
+
+        return $address;
+    }
+
+
+    /**
+     * Read a specific HTTP request header.
+     *
+     * @param  string $name Header name
+     *
+     * @return mixed  Header value or null if not available
+     */
+    public static function request_header($name)
+    {
+        if (function_exists('getallheaders')) {
+            $hdrs = array_change_key_case(getallheaders(), CASE_UPPER);
+            $key  = strtoupper($name);
+        }
+        else {
+            $key  = 'HTTP_' . strtoupper(strtr($name, '-', '_'));
+            $hdrs = array_change_key_case($_SERVER, CASE_UPPER);
+        }
+
+        return $hdrs[$key];
+    }
+
+    /**
+     * Explode quoted string
+     *
+     * @param string Delimiter expression string for preg_match()
+     * @param string Input string
+     *
+     * @return array String items
+     */
+    public static function explode_quoted_string($delimiter, $string)
+    {
+        $result = array();
+        $strlen = strlen($string);
+
+        for ($q=$p=$i=0; $i < $strlen; $i++) {
+            if ($string[$i] == "\"" && $string[$i-1] != "\\") {
+                $q = $q ? false : true;
+            }
+            else if (!$q && preg_match("/$delimiter/", $string[$i])) {
+                $result[] = substr($string, $p, $i - $p);
+                $p = $i + 1;
+            }
+        }
+
+        $result[] = substr($string, $p);
+
+        return $result;
+    }
+
+
+    /**
+     * Improved equivalent to strtotime()
+     *
+     * @param string $date  Date string
+     *
+     * @return int Unix timestamp
+     */
+    public static function strtotime($date)
+    {
+        // check for MS Outlook vCard date format YYYYMMDD
+        if (preg_match('/^([12][90]\d\d)([01]\d)(\d\d)$/', trim($date), $matches)) {
+            return mktime(0,0,0, intval($matches[2]), intval($matches[3]), intval($matches[1]));
+        }
+        else if (is_numeric($date)) {
+            return $date;
+        }
+
+        // support non-standard "GMTXXXX" literal
+        $date = preg_replace('/GMT\s*([+-][0-9]+)/', '\\1', $date);
+
+        // if date parsing fails, we have a date in non-rfc format.
+        // remove token from the end and try again
+        while ((($ts = @strtotime($date)) === false) || ($ts < 0)) {
+            $d = explode(' ', $date);
+            array_pop($d);
+            if (!$d) {
+                break;
+            }
+            $date = implode(' ', $d);
+        }
+
+        return $ts;
+    }
+
+
+    /*
+     * Idn_to_ascii wrapper.
+     * Intl/Idn modules version of this function doesn't work with e-mail address
+     */
+    public static function idn_to_ascii($str)
+    {
+        return self::idn_convert($str, true);
+    }
+
+
+    /*
+     * Idn_to_ascii wrapper.
+     * Intl/Idn modules version of this function doesn't work with e-mail address
+     */
+    public static function idn_to_utf8($str)
+    {
+        return self::idn_convert($str, false);
+    }
+
+
+    public static function idn_convert($input, $is_utf=false)
+    {
+        if ($at = strpos($input, '@')) {
+            $user   = substr($input, 0, $at);
+            $domain = substr($input, $at+1);
+        }
+        else {
+            $domain = $input;
+        }
+
+        $domain = $is_utf ? idn_to_ascii($domain) : idn_to_utf8($domain);
+
+        if ($domain === false) {
+            return '';
+        }
+
+        return $at ? $user . '@' . $domain : $domain;
+    }
+
+}