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<?php
namespace BOTK\Core;
/**
* A set of helpers for managing http protocols
*/
class Http
{
public static $STATUS_CODES = array(100 => "Continue", 101 => "Switching Protocols", 102 => "Processing",
200 => "OK", 201 => "Created", 202 => "Accepted", 203 => "Non-Authoritative Information",
204 => "No Content", 205 => "Reset Content", 206 => "Partial Content", 207 => "Multi-Status",
300 => "Multiple Choices", 301 => "Moved Permanently", 302 => "Found", 303 => "See Other",
304 => "Not Modified", 305 => "Use Proxy", 306 => "(Unused)", 307 => "Temporary Redirect",
308 => "Permanent Redirect", 400 => "Bad Request", 401 => "Unauthorized",
402 => "Payment Required", 403 => "Forbidden", 404 => "Not Found",
405 => "Method Not Allowed", 406 => "Not Acceptable", 407 => "Proxy Authentication Required",
408 => "Request Timeout", 409 => "Conflict", 410 => "Gone", 411 => "Length Required",
412 => "Precondition Failed", 413 => "Request Entity Too Large", 414 => "Request-URI Too Long",
415 => "Unsupported Media Type", 416 => "Requested Range Not Satisfiable", 417 => "Expectation Failed",
418 => "I'm a teapot", 419 => "Authentication Timeout", 420 => "Enhance Your Calm",
422 => "Unprocessable Entity", 423 => "Locked", 424 => "Failed Dependency", 424 => "Method Failure",
425 => "Unordered Collection", 426 => "Upgrade Required", 428 => "Precondition Required",
429 => "Too Many Requests", 431 => "Request Header Fields Too Large", 444 => "No Response",
449 => "Retry With", 450 => "Blocked by Windows Parental Controls",
451 => "Unavailable For Legal Reasons", 494 => "Request Header Too Large", 495 => "Cert Error",
496 => "No Cert", 497 => "HTTP to HTTPS", 499 => "Client Closed Request",
500 => "Internal Server Error", 501 => "Not Implemented", 502 => "Bad Gateway",
503 => "Service Unavailable", 504 => "Gateway Timeout", 505 => "HTTP Version Not Supported",
506 => "Variant Also Negotiates", 507 => "Insufficient Storage", 508 => "Loop Detected",
509 => "Bandwidth Limit Exceeded", 510 => "Not Extended", 511 => "Network Authentication Required",
598 => "Network read timeout error", 599 => "Network connect timeout error");
/*
* Here is a PHP 5.3.x implementation of http_response_code available in > PHP 5.4
*/
public static function setHttpResponseCode($statusCode)
{
if (version_compare(phpversion(), '5.4', '<')) {
$text = ($statusCode && isset( $httpStatusCodes[$statusCode]))
? Http::$STATUS_CODES[$statusCode]
: '';
$protocol = (isset($_SERVER['SERVER_PROTOCOL']) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.1');
$GLOBALS['http_response_code'] = $statusCode; // no other way to simulate http_response_code()
header($protocol . ' ' . $statusCode . ' ' . $text);
} else {
http_response_code($statusCode);
}
}
public static function getHttpResponseCode()
{
if (version_compare(phpversion(), '5.4', '<')) {
// Warning this works only if status was set using setHttpResponseCode
$statusCode = isset($GLOBALS['http_response_code'])
? $GLOBALS['http_response_code']
: 200;
} else {
$statusCode=http_response_code();
}
return $statusCode;
}
/*************************************************************************
* Parsing of response Header
*************************************************************************/
public static function getResponseHeader($name)
{
$sentHeaders = headers_list();
foreach ($sentHeaders as $sentHeader) {
if (preg_match("/$name:(.+)/i", $sentHeader,$matches)){
return trim($matches[1]);
}
}
return '';
}
public static function getETagResponse()
{
return preg_match('/"(.*)"/', self::getResponseHeader('ETag'),$matches)?trim($matches[1]):'';
}
public static function getResponseLinks()
{
$sentHeaders = headers_list();
$result=array();
foreach ($sentHeaders as $sentHeader) {
if (strpos($sentHeader, 'Link:')===0){
$l = new WebLink;
$result[] =$l->httpParse($sentHeader);
}
}
return $result;
}
/**
* Override ETag with a new calculated value from $data
*/
public static function setETagHeader($data,$etag=null)
{
// Recaluclate ETag overridin existent one Use Weak validation
if (is_null($etag)) {
if (is_resource($data)){
$etag = uniqid();
//try http wrapper to get a better value,
$meta = stream_get_meta_data($data);
for ($j = 0; isset($meta['wrapper_data'][$j]); $j++){
if (strstr(strtolower($meta['wrapper_data'][$j]), 'etag')){
$etag = str_replace('"', '', trim(substr($meta['wrapper_data'][$j], 6)));
break;
}
}
} elseif (is_object($data) && method_exists($data, 'getEtag')){
$etag = $data->getEtag();
} else {
$etag = md5(serialize($data));
}
}
// take into account ETags alread sent:
$oldETag=self::getETagResponse();
if($oldETag){
$etag= "\"$oldETag/$etag\"";
} else {
$etag= "\"$etag\"";
}
header ('ETag: '.$etag); // use Weak for semantically equivalent value
return $etag;
}
/**
* send Last-Modified header if not already set
*/
public static function setLastModifiedHeader($data,\DateTime $defaultDate)
{
// Skypp if already sent header...
if ( $lastModifiedOnHeaderVal=self::getResponseHeader('Last-Modified')) {
return $lastModifiedOn = new \DateTime(trim($lastModifiedOnHeaderVal));
}
//if $data is a resource try to get creation date from resource metadata
if ( is_resource($data)){
// try fstat first
$fstat = @fstat($data);
if (!empty($fstat)){
$lastModifiedOn = new \DateTime(date('r',$fstat['mtime']));
} else {
//try http wrapper
$meta = stream_get_meta_data($data);
$lastModifiedOn = $defaultDate;
for ($j = 0; isset($meta['wrapper_data'][$j]); $j++){
if (strstr(strtolower($meta['wrapper_data'][$j]), 'last-modified')){
$modtime = substr($meta['wrapper_data'][$j], 15);
$lastModifiedOn = new \DateTime($modtime);
break;
}
}
}
} elseif (is_object($data) && method_exists($data, 'getLastModifiedDate')) {
$lastModifiedOn = $data->getLastModifiedDate();
} else {
$lastModifiedOn = $defaultDate;
}
header('Last-Modified: '.$lastModifiedOn->format(\DateTime::RFC2822));
return $lastModifiedOn;
}
}