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<?php

/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/**

 * HTTP::Header

 *

 * PHP versions 4 and 5

 *

 * @category    HTTP

 * @package     HTTP_Header

 * @author      Wolfram Kriesing <wk@visionp.de>

 * @author      Davey Shafik <davey@php.net>

 * @author      Michael Wallner <mike@php.net>

 * @copyright   2003-2005 The Authors

 * @license     BSD, revised

 * @version     CVS: $Id$

 * @link        http://pear.php.net/package/HTTP_Header

 */

/**

 * Requires HTTP

 */

require_once 'HTTP.php';

/**#@+

 * Information Codes

 */

define('HTTP_HEADER_STATUS_100', '100 Continue');

define('HTTP_HEADER_STATUS_101', '101 Switching Protocols');

define('HTTP_HEADER_STATUS_102', '102 Processing');

define('HTTP_HEADER_STATUS_INFORMATIONAL',1);

/**#@-*/

/**#+

 * Success Codes

 */

define('HTTP_HEADER_STATUS_200', '200 OK');

define('HTTP_HEADER_STATUS_201', '201 Created');

define('HTTP_HEADER_STATUS_202', '202 Accepted');

define('HTTP_HEADER_STATUS_203', '203 Non-Authoritative Information');

define('HTTP_HEADER_STATUS_204', '204 No Content');

define('HTTP_HEADER_STATUS_205', '205 Reset Content');

define('HTTP_HEADER_STATUS_206', '206 Partial Content');

define('HTTP_HEADER_STATUS_207', '207 Multi-Status');

define('HTTP_HEADER_STATUS_SUCCESSFUL',2);

/**#@-*/

/**#@+

 * Redirection Codes

 */

define('HTTP_HEADER_STATUS_300', '300 Multiple Choices');

define('HTTP_HEADER_STATUS_301', '301 Moved Permanently');

define('HTTP_HEADER_STATUS_302', '302 Found');

define('HTTP_HEADER_STATUS_303', '303 See Other');

define('HTTP_HEADER_STATUS_304', '304 Not Modified');

define('HTTP_HEADER_STATUS_305', '305 Use Proxy');

define('HTTP_HEADER_STATUS_306', '306 (Unused)');

define('HTTP_HEADER_STATUS_307', '307 Temporary Redirect');

define('HTTP_HEADER_STATUS_REDIRECT',3);

/**#@-*/

/**#@+

 * Error Codes

 */

define('HTTP_HEADER_STATUS_400', '400 Bad Request');

define('HTTP_HEADER_STATUS_401', '401 Unauthorized');

define('HTTP_HEADER_STATUS_402', '402 Payment Granted');

define('HTTP_HEADER_STATUS_403', '403 Forbidden');

define('HTTP_HEADER_STATUS_404', '404 File Not Found');

define('HTTP_HEADER_STATUS_405', '405 Method Not Allowed');

define('HTTP_HEADER_STATUS_406', '406 Not Acceptable');

define('HTTP_HEADER_STATUS_407', '407 Proxy Authentication Required');

define('HTTP_HEADER_STATUS_408', '408 Request Time-out');

define('HTTP_HEADER_STATUS_409', '409 Conflict');

define('HTTP_HEADER_STATUS_410', '410 Gone');

define('HTTP_HEADER_STATUS_411', '411 Length Required');

define('HTTP_HEADER_STATUS_412', '412 Precondition Failed');

define('HTTP_HEADER_STATUS_413', '413 Request Entity Too Large');

define('HTTP_HEADER_STATUS_414', '414 Request-URI Too Large');

define('HTTP_HEADER_STATUS_415', '415 Unsupported Media Type');

define('HTTP_HEADER_STATUS_416', '416 Requested range not satisfiable');

define('HTTP_HEADER_STATUS_417', '417 Expectation Failed');

define('HTTP_HEADER_STATUS_422', '422 Unprocessable Entity');

define('HTTP_HEADER_STATUS_423', '423 Locked');

define('HTTP_HEADER_STATUS_424', '424 Failed Dependency');

define('HTTP_HEADER_STATUS_CLIENT_ERROR',4);

/**#@-*/

/**#@+

 * Server Errors

 */

define('HTTP_HEADER_STATUS_500', '500 Internal Server Error');

define('HTTP_HEADER_STATUS_501', '501 Not Implemented');

define('HTTP_HEADER_STATUS_502', '502 Bad Gateway');

define('HTTP_HEADER_STATUS_503', '503 Service Unavailable');

define('HTTP_HEADER_STATUS_504', '504 Gateway Time-out');

define('HTTP_HEADER_STATUS_505', '505 HTTP Version not supported');

define('HTTP_HEADER_STATUS_507', '507 Insufficient Storage');

define('HTTP_HEADER_STATUS_SERVER_ERROR',5);

/**#@-*/

/**

 * HTTP_Header

 *

 * @package     HTTP_Header

 * @category    HTTP

 * @access      public

 * @version     $Revision$

 */

class HTTP_Header extends HTTP

{

    /**

     * Default Headers

     *

     * The values that are set as default, are the same as PHP sends by default.

     *

     * @var     array

     * @access  private

     */

    var $_headers = array(

        'content-type'  =>  'text/html',

        'pragma'        =>  'no-cache',

        'cache-control' =>  'no-store, no-cache, must-revalidate, post-check=0, pre-check=0'

    );

    /**

     * HTTP version

     *

     * @var     string

     * @access  private

     */

    var $_httpVersion = '1.0';

    /**

     * Constructor

     *

     * Sets HTTP version.

     *

     * @access  public

     * @return  object  HTTP_Header

     */

    function HTTP_Header()

    {

        if (isset($_SERVER['SERVER_PROTOCOL'])) {

            $this->setHttpVersion(substr($_SERVER['SERVER_PROTOCOL'], -3));

        }

    }

    /**

     * Set HTTP version

     *

     * @access  public

     * @return  bool    Returns true on success or false if version doesn't

     *                  match 1.0 or 1.1 (note: 1 will result in 1.0)

     * @param   mixed   $version HTTP version, either 1.0 or 1.1

     */

    function setHttpVersion($version)

    {

        $version = round((float) $version, 1);

        if ($version < 1.0 || $version > 1.1) {

            return false;

        }

        $this->_httpVersion = sprintf('%0.1f', $version);

        return true;

    }

    /**

     * Get HTTP version

     *

     * @access  public

     * @return  string

     */

    function getHttpVersion()

    {

        return $this->_httpVersion;

    }

    /**

     * Set Header

     *

     * The default value for the Last-Modified header will be current

     * date and atime if $value is omitted.

     *

     * @access  public

     * @return  bool    Returns true on success or false if $key was empty or

     *                  $value was not of an scalar type.

     * @param   string  $key The name of the header.

     * @param   string  $value The value of the header. (NULL to unset header)

     */

    function setHeader($key, $value = null)

    {

        if (empty($key) || (isset($value) && !is_scalar($value))) {

            return false;

        }

        $key = strToLower($key);

        if ($key == 'last-modified') {

            if (!isset($value)) {

                $value = HTTP::Date(time());

            } elseif (is_numeric($value)) {

                $value = HTTP::Date($value);

            }

        }

        if (isset($value)) {

            $this->_headers[$key] = $value;

        } else {

            unset($this->_headers[$key]);

        }

        return true;

    }

    /**

     * Get Header

     *

     * If $key is omitted, all stored headers will be returned.

     *

     * @access  public

     * @return  mixed   Returns string value of the requested header,

     *                  array values of all headers or false if header $key

     *                  is not set.

     * @param   string  $key    The name of the header to fetch.

     */

    function getHeader($key = null)

    {

        if (!isset($key)) {

            return $this->_headers;

        }

        $key = strToLower($key);

        if (!isset($this->_headers[$key])) {

            return false;

        }

        return $this->_headers[$key];

    }

    /**

     * Send Headers

     *

     * Send out the header that you set via setHeader().

     *

     * @access  public

     * @return  bool    Returns true on success or false if headers are already

     *                  sent.

     * @param   array   $keys Headers to (not) send, see $include.

     * @param   array   $include If true only $keys matching headers will be

     *                  sent, if false only header not matching $keys will be

     *                  sent.

     */

    function sendHeaders($keys = array(), $include = true)

    {

        if (headers_sent()) {

            return false;

        }

        if (count($keys)) {

            array_change_key_case($keys, CASE_LOWER);

            foreach ($this->_headers as $key => $value) {

                if ($include ? in_array($key, $keys) : !in_array($key, $keys)) {

                    header($key .': '. $value);

                }

            }

        } else {

            foreach ($this->_headers as $header => $value) {

                header($header .': '. $value);

            }

        }

        return true;

    }

    /**

     * Send Satus Code

     *

     * Send out the given HTTP-Status code. Use this for example when you

     * want to tell the client this page is cached, then you would call

     * sendStatusCode(304).

     *

     * @see HTTP_Header_Cache::exitIfCached()

     *

     * @access  public

     * @return  bool    Returns true on success or false if headers are already

     *                  sent.

     * @param   int     $code The status code to send, i.e. 404, 304, 200, etc.

     */

    function sendStatusCode($code)

    {

        if (headers_sent()) {

            return false;

        }

        if ($code == (int) $code && defined('HTTP_HEADER_STATUS_'. $code)) {

            $code = constant('HTTP_HEADER_STATUS_'. $code);

        }

        if (strncasecmp(PHP_SAPI, 'cgi', 3)) {

            header('HTTP/'. $this->_httpVersion .' '. $code);

        } else {

            header('Status: '. $code);

        }

        return true;

    }

    /**

     * Date to Timestamp

     *

     * Converts dates like

     *      Mon, 31 Mar 2003 15:26:34 GMT

     *      Tue, 15 Nov 1994 12:45:26 GMT

     * into a timestamp, strtotime() didn't do it in older versions.

     *

     * @deprecated      Use PHPs strtotime() instead.

     * @access  public

     * @return  mixed   Returns int unix timestamp or false if the date doesn't

     *                  seem to be a valid GMT date.

     * @param   string  $date The GMT date.

     */

    function dateToTimestamp($date)

    {

        static $months = array(

            null => 0, 'Jan' => 1, 'Feb' => 2, 'Mar' => 3, 'Apr' => 4,

            'May' => 5, 'Jun' => 6, 'Jul' => 7, 'Aug' => 8, 'Sep' => 9,

            'Oct' => 10, 'Nov' => 11, 'Dec' => 12

        );

        if (-1 < $timestamp = strToTime($date)) {

            return $timestamp;

        }

        if (!preg_match('~[^,]*,\s(\d+)\s(\w+)\s(\d+)\s(\d+):(\d+):(\d+).*~',

            $date, $m)) {

            return false;

        }

        // [0] => Mon, 31 Mar 2003 15:42:55 GMT

        // [1] => 31 [2] => Mar [3] => 2003 [4] => 15 [5] => 42 [6] => 55

        return mktime($m[4], $m[5], $m[6], $months[$m[2]], $m[1], $m[3]);

    }

    /**

     * Redirect

     *

     * This function redirects the client. This is done by issuing a Location

     * header and exiting.  Additionally to HTTP::redirect() you can also add

     * parameters to the url.

     *

     * If you dont need parameters to be added, simply use HTTP::redirect()

     * otherwise use HTTP_Header::redirect().

     *

     * @see     HTTP::redirect()

     * @author  Wolfram Kriesing <wk@visionp.de>

     * @access  public

     * @return  void

     * @param   string  $url The URL to redirect to, if none is given it

     *                  redirects to the current page.

     * @param   array   $param Array of query string parameters to add; usually

     *                  a set of key => value pairs; if an array entry consists

     *                  only of an value it is used as key and the respective

     *                  value is fetched from $GLOBALS[$value]

     * @param   bool    $session Whether the session name/id should be added

     */

    function redirect($url = null, $param = array(), $session = false)

    {

        if (!isset($url)) {

            $url = $_SERVER['PHP_SELF'];

        }

        $qs = array();

        if ($session) {

            $qs[] = session_name() .'='. session_id();

        }

        if (is_array($param) && count($param)) {

            if (count($param)) {

                foreach ($param as $key => $val) {

                    if (is_string($key)) {

                        $qs[] = urlencode($key) .'='. urlencode($val);

                    } else {

                        $qs[] = urlencode($val) .'='. urlencode(@$GLOBALS[$val]);

                    }

                }

            }

        }

        if ($qstr = implode('&', $qs)) {

            $purl = parse_url($url);

            $url .= (isset($purl['query']) ? '&' : '?') . $qstr;

        }

        parent::redirect($url);

    }

    /**#@+

     * @author  Davey Shafik <davey@php.net>

     * @param   int $http_code HTTP Code to check

     * @access  public

     */

    /**

     * Return HTTP Status Code Type

     *

     * @return int|false

     */

    function getStatusType($http_code)

    {

        if(is_int($http_code) && defined('HTTP_HEADER_STATUS_' .$http_code) || defined($http_code)) {

            $type = substr($http_code,0,1);

            switch ($type) {

                case HTTP_HEADER_STATUS_INFORMATIONAL:

                case HTTP_HEADER_STATUS_SUCCESSFUL:

                case HTTP_HEADER_STATUS_REDIRECT:

                case HTTP_HEADER_STATUS_CLIENT_ERROR:

                case HTTP_HEADER_STATUS_SERVER_ERROR:

                    return $type;

                    break;

                default:

                    return false;

                    break;

            }

        } else {

            return false;

        }

    }

    /**

     * Return Status Code Message

     *

     * @return string|false

     */

    function getStatusText($http_code)

    {

        if ($this->getStatusType($http_code)) {

            if (is_int($http_code) && defined('HTTP_HEADER_STATUS_' .$http_code)) {

                return substr(constant('HTTP_HEADER_STATUS_' .$http_code),4);

            } else {

                return substr($http_code,4);

            }

        } else {

            return false;

        }

    }

    /**

     * Checks if HTTP Status code is Information (1xx)

     *

     * @return boolean

     */

    function isInformational($http_code)

    {

        if ($status_type = $this->getStatusType($http_code)) {

            return $status_type{0} == HTTP_HEADER_STATUS_INFORMATIONAL;

        } else {

            return false;

        }

    }

    /**

     * Checks if HTTP Status code is Successful (2xx)

     *

     * @return boolean

     */

    function isSuccessful($http_code)

    {

        if ($status_type = $this->getStatusType($http_code)) {

            return $status_type{0} == HTTP_HEADER_STATUS_SUCCESSFUL;

        } else {

            return false;

        }

    }

    /**

     * Checks if HTTP Status code is a Redirect (3xx)

     *

     * @return boolean

     */

    function isRedirect($http_code)

    {

        if ($status_type = $this->getStatusType($http_code)) {

            return $status_type{0} == HTTP_HEADER_STATUS_REDIRECT;

        } else {

            return false;

        }

    }

    /**

     * Checks if HTTP Status code is a Client Error (4xx)

     *

     * @return boolean

     */

    function isClientError($http_code)

    {

        if ($status_type = $this->getStatusType($http_code)) {

            return $status_type{0} == HTTP_HEADER_STATUS_CLIENT_ERROR;

        } else {

            return false;

        }

    }

    /**

     * Checks if HTTP Status code is Server Error (5xx)

     *

     * @return boolean

     */

    function isServerError($http_code)

    {

        if ($status_type = $this->getStatusType($http_code)) {

            return $status_type{0} == HTTP_HEADER_STATUS_SERVER_ERROR;

        } else {

            return false;

        }

    }

    /**

     * Checks if HTTP Status code is Server OR Client Error (4xx or 5xx)

     *

     * @return boolean

     */

    function isError($http_code)

    {

        if ($status_type = $this->getStatusType($http_code)) {

            return (($status_type == HTTP_HEADER_STATUS_CLIENT_ERROR) || ($status_type == HTTP_HEADER_STATUS_SERVER_ERROR)) ? true : false;

        } else {

            return false;

        }

    }

    /**#@-*/

}

?>