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<?php
/*********************************************************************
class.http.php
Http helper.
Peter Rotich <peter@osticket.com>
http://www.osticket.com
Released under the GNU General Public License WITHOUT ANY WARRANTY.
See LICENSE.TXT for details.
vim: expandtab sw=4 ts=4 sts=4:
**********************************************************************/
class Http {
function header_code_verbose($code) {
switch($code):
case 200: return '200 OK';
case 201: return '201 Created';
case 204: return '204 No Content';
case 205: return '205 Reset Content';
case 400: return '400 Bad Request';
case 401: return '401 Unauthorized';
case 403: return '403 Forbidden';
case 404: return '404 Not Found';
case 405: return '405 Method Not Allowed';
case 416: return '416 Requested Range Not Satisfiable';
case 422: return '422 Unprocessable Entity';
default: return '500 Internal Server Error';
endswitch;
}
function response($code,$content,$contentType='text/html',$charset='UTF-8') {
header('HTTP/1.1 '.Http::header_code_verbose($code));
header('Status: '.Http::header_code_verbose($code)."\r\n");
header("Connection: Close\r\n");
header("Content-Type: $contentType; charset=$charset\r\n");
header('Content-Length: '.strlen($content)."\r\n\r\n");
print $content;
exit;
}
function redirect($url,$delay=0,$msg='') {
$iis = strpos($_SERVER['SERVER_SOFTWARE'], 'IIS') !== false;
@list($name, $version) = explode('/', $_SERVER['SERVER_SOFTWARE']);
// Legacy code for older versions of IIS that would not emit the
// correct HTTP status and headers when using the `Location`
// header alone
if ($iis && version_compare($version, '7.0', '<')) {
header("Refresh: $delay; URL=$url");
}else{
header("Location: $url");
}
print('<html></html>');
flush();
ob_flush();
function cacheable($etag, $modified, $ttl=3600) {
// Thanks, http://stackoverflow.com/a/1583753/1025836
// Timezone doesn't matter here — but the time needs to be
// consistent round trip to the browser and back.
$last_modified = strtotime($modified." GMT");
header("Last-Modified: ".date('D, d M Y H:i:s', $last_modified)." GMT", false);
header('ETag: "'.$etag.'"');
header("Cache-Control: private, max-age=$ttl");
header('Expires: ' . gmdate('D, d M Y H:i:s', Misc::gmtime() + $ttl)." GMT");
header('Pragma: private');
if (@strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) == $last_modified ||
@trim($_SERVER['HTTP_IF_NONE_MATCH'], '" ') == $etag) {
header("HTTP/1.1 304 Not Modified");
exit();
}
}
/**
* Creates the filename=... part of the Content-Disposition header. This
* is browser dependent, so the user agent is inspected to determine the
* best encoding format for the filename
*/
function getDispositionFilename($filename) {
$user_agent = strtolower ($_SERVER['HTTP_USER_AGENT']);
if (false !== strpos($user_agent,'msie')
&& false !== strpos($user_agent,'win'))
return 'filename='.rawurlencode($filename);
elseif (false !== strpos($user_agent, 'safari')
&& false === strpos($user_agent, 'chrome'))
// Safari and Safari only can handle the filename as is
return 'filename='.str_replace(',', '', $filename);
else
// Use RFC5987
return "filename*=UTF-8''".rawurlencode($filename);
}
function download($filename, $type, $data=null, $disposition='attachment') {
header('Pragma: private');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Cache-Control: private', false);
header('Content-Type: '.$type);
header(sprintf('Content-Disposition: %s; %s',
$disposition,
self::getDispositionFilename(basename($filename))));
header('Content-Transfer-Encoding: binary');
if ($data !== null) {
header('Content-Length: '.strlen($data));
print $data;
exit;
}
}
static function build_query($vars, $encode=true, $separator='&') {
return http_build_query(
($encode ? Format::htmlchars($vars) : $vars), '', $separator);
}