/core/ajax_lib/Php.php

<?php

/**

 * JsHttpRequest: PHP backend for JavaScript DHTML loader.

 * (C) 2005 Dmitry Koterov, http://forum.dklab.ru/users/DmitryKoterov/

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 * See http://www.gnu.org/copyleft/lesser.html

 *

 * Do not remove this comment if you want to use the script!

 * ?? ????€??? ?????? ???????????, ???? ?? ?????? ???????????? ??????!

 *

 * This backend library also supports POST requests additionally to GET.

 *

 * @author Dmitry Koterov 

 * @version 4.14

 */



class JsHttpRequest

{

    var $SCRIPT_ENCODING = "windows-1251";

    var $SCRIPT_DECODE_MODE = '';

    var $LOADER = null;

    var $ID = null;    

    

    // Internal; uniq value.

    var $_uniqHash;    

    // Internal: response content-type depending on loader type.

    var $_contentTypes = array(

        "script" => "text/javascript",

        "xml"    => "text/plain",

        "form"   => "text/html",

        ""       => "text/plain", // for unknown loader

    );    



    

    /**

     * Constructor.

     * 

     * Create new JsHttpRequest backend object and attach it

     * to script output buffer. As a result - script will always return

     * correct JavaScript code, even in case of fatal errors.

     */

    function JsHttpRequest($enc)

    {

        // QUERY_STRING is in form: PHPSESSID=<sid>&a=aaa&b=bbb&<id>

        // where <id> is request ID, <sid> - session ID (if present), 

        // PHPSESSID - session parameter name (by default = "PHPSESSID").

        

        // Parse QUERY_STRING wrapper format.

        if (preg_match('/^(.*)(?:&|^)JsHttpRequest=(\d+)-([^&]+)((?:&|$).*)$/s', $_SERVER['QUERY_STRING'], $m)) {

            $this->ID = $m[2];

            $this->LOADER = strtolower($m[3]);

            $_SERVER['QUERY_STRING'] = $m[1] . $m[4];

            unset($_GET['JsHttpRequest']);

            unset($_REQUEST['JsHttpRequest']);

        } else {

            $this->ID = 0;

            $this->LOADER = 'unknown';

        }



        // Start OB handling early.

        $this->_uniqHash = md5(microtime() . getmypid());

        ini_set('error_prepend_string', ini_get('error_prepend_string') . $this->_uniqHash);

        ini_set('error_append_string',  ini_get('error_append_string') . $this->_uniqHash);

        ob_start(array(&$this, "_obHandler"));



        // Set up encoding.

        $this->setEncoding($enc);



        // Check if headers are already sent (see Content-Type library usage).

        // If true - generate debug message and exit.

        $file = $line = null;

        if (headers_sent($file, $line)) {

            trigger_error(

                "HTTP headers are already sent" . ($line !== null? " in $file on line $line" : "") . ". "

                . "Possibly you have extra spaces (or newlines) before first line of the script or any library. "

                . "Please note that Subsys_JsHttpRequest uses its own Content-Type header and fails if "

                . "this header cannot be set. See header() function documentation for details",

                E_USER_ERROR

            );

            exit();

        }

    }





    /**

     * string getJsCode()

     * 

     * Return JavaScript part of library.

     */

    function getJsCode()

    {

        return file_get_contents(dirname(__FILE__).'/JsHttpRequest.js');

    }





    /**

     * void setEncoding(string $encoding)

     * 

     * Set active script encoding & correct QUERY_STRING according to it.

     * Examples:

     *   "windows-1251"          - set plain encoding (non-windows characters, 

     *                             e.g. hieroglyphs, are totally ignored)

     *   "windows-1251 entities" - set windows encoding, BUT additionally replace:

     *                             "&"         ->  "&amp;" 

     *                             hieroglyph  ->  &#XXXX; entity

     */

    function setEncoding($enc)

    {

        // Parse encoding.

        preg_match('/^(\S*)(?:\s+(\S*))$/', $enc, $p);

        $this->SCRIPT_ENCODING    = strtolower(!empty($p[1])? $p[1] : $enc);

        $this->SCRIPT_DECODE_MODE = !empty($p[2])? $p[2] : '';

        // Manually parse QUERY_STRING because of damned Unicode's %uXXXX.

        $this->_correctSuperglobals();

    }



    

    /**

     * string quoteInput(string $input)

     * 

     * Quote string according to input decoding mode.

     * If entities is used (see setEncoding()), no '&' character is quoted,

     * only '"', '>' and '<' (we presume than '&' is already quoted by

     * input reader function).

     *

     * Use this function INSTEAD of htmlspecialchars() for $_GET data 

     * in your scripts.

     */

    function quoteInput($s)

    {

        if ($this->SCRIPT_DECODE_MODE == 'entities')

            return str_replace(array('"', '<', '>'), array('&quot;', '&lt;', '&gt;'), $s);

        else

            return htmlspecialchars($s);

    }





    /**

     * Convert PHP scalar, array or hash to JS scalar/array/hash.

     */

    function php2js($a)

    {

        if (is_null($a)) return 'null';

        if ($a === false) return 'false';

        if ($a === true) return 'true';

        if (is_scalar($a)) {

            $a = addslashes($a);

            $a = str_replace("\n", '\n', $a);

            $a = str_replace("\r", '\r', $a);

            $a = preg_replace('{(</)(script)}i', "$1'+'$2", $a); // for FORM loader

            return "'$a'";

        }

        $isList = true;

        for ($i=0, reset($a); $i<count($a); $i++, next($a))

            if (key($a) !== $i) { $isList = false; break; }

        $result = array();

        if ($isList) {

            foreach ($a as $v) $result[] = JsHttpRequest::php2js($v);

            return '[ ' . join(', ', $result) . ' ]';

        } else {

            foreach ($a as $k=>$v) $result[] = JsHttpRequest::php2js($k) . ': ' . JsHttpRequest::php2js($v);

            return '{ ' . join(', ', $result) . ' }';

        }

    }



        

    /**

     * Internal methods.

     */



    /**

     * Parse & decode QUERY_STRING.

     */

    function _correctSuperglobals()

    {

        // In case of FORM loader we may go to nirvana, everything is already parsed by PHP.

        if ($this->LOADER == 'form') return;

        

        // ATTENTION!!!

        // HTTP_RAW_POST_DATA is only accessible when Content-Type of POST request

        // is NOT default "application/x-www-form-urlencoded"!!!

        // Library frontend sets "application/octet-stream" for that purpose,

        // see JavaScript code.

        $source = array(

            '_GET' => !empty($_SERVER['QUERY_STRING'])? $_SERVER['QUERY_STRING'] : null, 

            '_POST'=> !empty($GLOBALS['HTTP_RAW_POST_DATA'])? $GLOBALS['HTTP_RAW_POST_DATA'] : null

        );

        foreach ($source as $dst=>$src) {

            // First correct all 2-byte entities.

            $s = preg_replace('/%(?!5B)(?!5D)([0-9a-f]{2})/si', '%u00\\1', $src);

            // Now we can use standard parse_str() with no worry!

            $data = null;

            parse_str($s, $data);

            $GLOBALS[$dst] = $this->_ucs2EntitiesDecode($data);

        }

        $GLOBALS['HTTP_GET_VARS'] = $_GET; // deprecated vars

        $GLOBALS['HTTP_POST_VARS'] = $_POST;

        $_REQUEST = 

            (isset($_COOKIE)? $_COOKIE : array()) + 

            (isset($_POST)? $_POST : array()) + 

            (isset($_GET)? $_GET : array());

        if (ini_get('register_globals')) {

            // TODO?

        }

    }





    /**

     * Called in case of error too!

     */

    function _obHandler($text)

    {

        // Check for error.

        if (preg_match('{'.$this->_uniqHash.'(.*?)'.$this->_uniqHash.'}sx', $text)) {

            $text = str_replace($this->_uniqHash, '', $text);

        }



        // Content-type header.

        // In XMLHttpRRequest mode we must return text/plain - damned stupid Opera 8.0. :(

        $ctype = !empty($this->_contentTypes[$this->LOADER])? $this->_contentTypes[$this->LOADER] : $this->_contentTypes[''];

        header("Content-type: $ctype; charset={$this->SCRIPT_ENCODING}");

                

        // Make resulting hash.

        if (!isset($this->RESULT)) $this->RESULT = isset($GLOBALS['_RESULT'])? $GLOBALS['_RESULT'] : null;

        $result = $this->php2js($this->RESULT);

        $jsWindow = $ctype == "text/html"? 'parent.' : '';

        $text = 

            "// BEGIN JsHttpRequest\n" .

            "{$jsWindow}JsHttpRequest.dataReady(\n" . 

                "  " . $this->php2js($this->ID) . ", // this ID is passed from JavaScript frontend\n" . 

                "  " . $this->php2js(trim($text)) . ",\n" .

                "  " . $result . "\n" .

            ")\n" .

            "// END JsHttpRequest\n" .

        "";

        if ($jsWindow) {

            $text = '<script type="text/javascript" language="JavaScript"><!--' . "\n$text" . '//--></script>';

        }

//        $f = fopen("/debug", "w"); fwrite($f, $text); fclose($f);



        return $text;

    }





    /**

     * Decode all %uXXXX entities in string or array (recurrent).

     * String must not contain %XX entities - they are ignored!

     */

    function _ucs2EntitiesDecode($data)

    {

        if (is_array($data)) {

            $d = array();

            foreach ($data as $k=>$v) {

                $d[$this->_ucs2EntitiesDecode($k)] = $this->_ucs2EntitiesDecode($v);

            }

            return $d;

        } else {

            if (strpos($data, '%u') !== false) { // improve speed

                $data = preg_replace_callback('/%u([0-9A-F]{1,4})/si', array(&$this, '_ucs2EntitiesDecodeCallback'), $data);

            }

            return $data;

        }

    }





    /**

     * Decode one %uXXXX entity (RE callback).

     */

    function _ucs2EntitiesDecodeCallback($p)

    {

        $hex = $p[1];

        $dec = hexdec($hex);

        if ($dec === "38" && $this->SCRIPT_DECODE_MODE == 'entities') {

            // Process "&" separately in "entities" decode mode.

            $c = "&amp;";

        } else {

            if (is_callable('iconv')) {

                $c = @iconv('UCS-2BE', $this->SCRIPT_ENCODING, pack('n', $dec));

            } else {

                $c = $this->_decUcs2Decode($dec, $this->SCRIPT_ENCODING);

            }

            if (!strlen($c)) {

                if ($this->SCRIPT_DECODE_MODE == 'entities') {

                    $c = '&#'.$dec.';';

                } else {

                    $c = '?';

                }

            }

        }

        return $c;

    }





    /**

     * If there is no ICONV, try to decode 1-byte characters manually

     * (for most popular charsets only).

     */



    /**

     * Convert from UCS-2BE decimal to $toEnc.

     */

    function _decUcs2Decode($code, $toEnc)

    {

        if ($code < 128) return chr($code);

        if (isset($this->_encTables[$toEnc])) {

            $p = array_search($code, $this->_encTables[$toEnc]);

            if ($p !== false) return chr(128 + $p);

        }

        return "";

    }

    



    /**

     * UCS-2BE -> 1-byte encodings (from #128).

     */

    var $_encTables = array(

        'windows-1251' => array(

            0x0402, 0x0403, 0x201A, 0x0453, 0x201E, 0x2026, 0x2020, 0x2021,

            0x20AC, 0x2030, 0x0409, 0x2039, 0x040A, 0x040C, 0x040B, 0x040F,

            0x0452, 0x2018, 0x2019, 0x201C, 0x201D, 0x2022, 0x2013, 0x2014,

            0x0098, 0x2122, 0x0459, 0x203A, 0x045A, 0x045C, 0x045B, 0x045F,

            0x00A0, 0x040E, 0x045E, 0x0408, 0x00A4, 0x0490, 0x00A6, 0x00A7,

            0x0401, 0x00A9, 0x0404, 0x00AB, 0x00AC, 0x00AD, 0x00AE, 0x0407,

            0x00B0, 0x00B1, 0x0406, 0x0456, 0x0491, 0x00B5, 0x00B6, 0x00B7,

            0x0451, 0x2116, 0x0454, 0x00BB, 0x0458, 0x0405, 0x0455, 0x0457,

            0x0410, 0x0411, 0x0412, 0x0413, 0x0414, 0x0415, 0x0416, 0x0417,

            0x0418, 0x0419, 0x041A, 0x041B, 0x041C, 0x041D, 0x041E, 0x041F,

            0x0420, 0x0421, 0x0422, 0x0423, 0x0424, 0x0425, 0x0426, 0x0427,

            0x0428, 0x0429, 0x042A, 0x042B, 0x042C, 0x042D, 0x042E, 0x042F,

            0x0430, 0x0431, 0x0432, 0x0433, 0x0434, 0x0435, 0x0436, 0x0437,

            0x0438, 0x0439, 0x043A, 0x043B, 0x043C, 0x043D, 0x043E, 0x043F,

            0x0440, 0x0441, 0x0442, 0x0443, 0x0444, 0x0445, 0x0446, 0x0447,

            0x0448, 0x0449, 0x044A, 0x044B, 0x044C, 0x044D, 0x044E, 0x044F,

        ),

        'koi8-r' => array(

            0x2500, 0x2502, 0x250C, 0x2510, 0x2514, 0x2518, 0x251C, 0x2524,

            0x252C, 0x2534, 0x253C, 0x2580, 0x2584, 0x2588, 0x258C, 0x2590,

            0x2591, 0x2592, 0x2593, 0x2320, 0x25A0, 0x2219, 0x221A, 0x2248,

            0x2264, 0x2265, 0x00A0, 0x2321, 0x00B0, 0x00B2, 0x00B7, 0x00F7,

            0x2550, 0x2551, 0x2552, 0x0451, 0x2553, 0x2554, 0x2555, 0x2556,

            0x2557, 0x2558, 0x2559, 0x255A, 0x255B, 0x255C, 0x255d, 0x255E,

            0x255F, 0x2560, 0x2561, 0x0401, 0x2562, 0x2563, 0x2564, 0x2565,

            0x2566, 0x2567, 0x2568, 0x2569, 0x256A, 0x256B, 0x256C, 0x00A9,

            0x044E, 0x0430, 0x0431, 0x0446, 0x0434, 0x0435, 0x0444, 0x0433,

            0x0445, 0x0438, 0x0439, 0x043A, 0x043B, 0x043C, 0x043d, 0x043E,

            0x043F, 0x044F, 0x0440, 0x0441, 0x0442, 0x0443, 0x0436, 0x0432,

            0x044C, 0x044B, 0x0437, 0x0448, 0x044d, 0x0449, 0x0447, 0x044A,

            0x042E, 0x0410, 0x0411, 0x0426, 0x0414, 0x0415, 0x0424, 0x0413,

            0x0425, 0x0418, 0x0419, 0x041A, 0x041B, 0x041C, 0x041d, 0x041E,

            0x041F, 0x042F, 0x0420, 0x0421, 0x0422, 0x0423, 0x0416, 0x0412,

            0x042C, 0x042B, 0x0417, 0x0428, 0x042d, 0x0429, 0x0427, 0x042A      

        ),

    );

}

?>