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gnu-social/extlib/HTTP/Request2/Response.php

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<?php
/**
* Class representing a HTTP response
*
* PHP version 5
*
* LICENSE
*
* This source file is subject to BSD 3-Clause License that is bundled
* with this package in the file LICENSE and available at the URL
* https://raw.github.com/pear/HTTP_Request2/trunk/docs/LICENSE
*
* @category HTTP
* @package HTTP_Request2
* @author Alexey Borzov <avb@php.net>
* @copyright 2008-2016 Alexey Borzov <avb@php.net>
* @license http://opensource.org/licenses/BSD-3-Clause BSD 3-Clause License
* @link http://pear.php.net/package/HTTP_Request2
*/
/**
* Exception class for HTTP_Request2 package
*/
require_once 'HTTP/Request2/Exception.php';
/**
* Class representing a HTTP response
*
* The class is designed to be used in "streaming" scenario, building the
* response as it is being received:
* <code>
* $statusLine = read_status_line();
* $response = new HTTP_Request2_Response($statusLine);
* do {
* $headerLine = read_header_line();
* $response->parseHeaderLine($headerLine);
* } while ($headerLine != '');
*
* while ($chunk = read_body()) {
* $response->appendBody($chunk);
* }
*
* var_dump($response->getHeader(), $response->getCookies(), $response->getBody());
* </code>
*
* @category HTTP
* @package HTTP_Request2
* @author Alexey Borzov <avb@php.net>
* @license http://opensource.org/licenses/BSD-3-Clause BSD 3-Clause License
* @version Release: 2.3.0
* @link http://pear.php.net/package/HTTP_Request2
* @link http://tools.ietf.org/html/rfc2616#section-6
*/
class HTTP_Request2_Response
{
/**
* HTTP protocol version (e.g. 1.0, 1.1)
* @var string
*/
protected $version;
/**
* Status code
* @var integer
* @link http://tools.ietf.org/html/rfc2616#section-6.1.1
*/
protected $code;
/**
* Reason phrase
* @var string
* @link http://tools.ietf.org/html/rfc2616#section-6.1.1
*/
protected $reasonPhrase;
/**
* Effective URL (may be different from original request URL in case of redirects)
* @var string
*/
protected $effectiveUrl;
/**
* Associative array of response headers
* @var array
*/
protected $headers = array();
/**
* Cookies set in the response
* @var array
*/
protected $cookies = array();
/**
* Name of last header processed by parseHederLine()
*
* Used to handle the headers that span multiple lines
*
* @var string
*/
protected $lastHeader = null;
/**
* Response body
* @var string
*/
protected $body = '';
/**
* Whether the body is still encoded by Content-Encoding
*
* cURL provides the decoded body to the callback; if we are reading from
* socket the body is still gzipped / deflated
*
* @var bool
*/
protected $bodyEncoded;
/**
* Associative array of HTTP status code / reason phrase.
*
* @var array
* @link http://tools.ietf.org/html/rfc2616#section-10
*/
protected static $phrases = array(
// 1xx: Informational - Request received, continuing process
100 => 'Continue',
101 => 'Switching Protocols',
// 2xx: Success - The action was successfully received, understood and
// accepted
200 => 'OK',
201 => 'Created',
202 => 'Accepted',
203 => 'Non-Authoritative Information',
204 => 'No Content',
205 => 'Reset Content',
206 => 'Partial Content',
// 3xx: Redirection - Further action must be taken in order to complete
// the request
300 => 'Multiple Choices',
301 => 'Moved Permanently',
302 => 'Found', // 1.1
303 => 'See Other',
304 => 'Not Modified',
305 => 'Use Proxy',
307 => 'Temporary Redirect',
// 4xx: Client Error - The request contains bad syntax or cannot be
// fulfilled
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',
// 5xx: Server Error - The server failed to fulfill an apparently
// valid request
500 => 'Internal Server Error',
501 => 'Not Implemented',
502 => 'Bad Gateway',
503 => 'Service Unavailable',
504 => 'Gateway Timeout',
505 => 'HTTP Version Not Supported',
509 => 'Bandwidth Limit Exceeded',
);
/**
* Returns the default reason phrase for the given code or all reason phrases
*
* @param int $code Response code
*
* @return string|array|null Default reason phrase for $code if $code is given
* (null if no phrase is available), array of all
* reason phrases if $code is null
* @link http://pear.php.net/bugs/18716
*/
public static function getDefaultReasonPhrase($code = null)
{
if (null === $code) {
return self::$phrases;
} else {
return isset(self::$phrases[$code]) ? self::$phrases[$code] : null;
}
}
/**
* Constructor, parses the response status line
*
* @param string $statusLine Response status line (e.g. "HTTP/1.1 200 OK")
* @param bool $bodyEncoded Whether body is still encoded by Content-Encoding
* @param string $effectiveUrl Effective URL of the response
*
* @throws HTTP_Request2_MessageException if status line is invalid according to spec
*/
public function __construct($statusLine, $bodyEncoded = true, $effectiveUrl = null)
{
if (!preg_match('!^HTTP/(\d\.\d) (\d{3})(?: (.+))?!', $statusLine, $m)) {
throw new HTTP_Request2_MessageException(
"Malformed response: {$statusLine}",
HTTP_Request2_Exception::MALFORMED_RESPONSE
);
}
$this->version = $m[1];
$this->code = intval($m[2]);
$this->reasonPhrase = !empty($m[3]) ? trim($m[3]) : self::getDefaultReasonPhrase($this->code);
$this->bodyEncoded = (bool)$bodyEncoded;
$this->effectiveUrl = (string)$effectiveUrl;
}
/**
* Parses the line from HTTP response filling $headers array
*
* The method should be called after reading the line from socket or receiving
* it into cURL callback. Passing an empty string here indicates the end of
* response headers and triggers additional processing, so be sure to pass an
* empty string in the end.
*
* @param string $headerLine Line from HTTP response
*/
public function parseHeaderLine($headerLine)
{
$headerLine = trim($headerLine, "\r\n");
if ('' == $headerLine) {
// empty string signals the end of headers, process the received ones
if (!empty($this->headers['set-cookie'])) {
$cookies = is_array($this->headers['set-cookie'])?
$this->headers['set-cookie']:
array($this->headers['set-cookie']);
foreach ($cookies as $cookieString) {
$this->parseCookie($cookieString);
}
unset($this->headers['set-cookie']);
}
foreach (array_keys($this->headers) as $k) {
if (is_array($this->headers[$k])) {
$this->headers[$k] = implode(', ', $this->headers[$k]);
}
}
} elseif (preg_match('!^([^\x00-\x1f\x7f-\xff()<>@,;:\\\\"/\[\]?={}\s]+):(.+)$!', $headerLine, $m)) {
// string of the form header-name: header value
$name = strtolower($m[1]);
$value = trim($m[2]);
if (empty($this->headers[$name])) {
$this->headers[$name] = $value;
} else {
if (!is_array($this->headers[$name])) {
$this->headers[$name] = array($this->headers[$name]);
}
$this->headers[$name][] = $value;
}
$this->lastHeader = $name;
} elseif (preg_match('!^\s+(.+)$!', $headerLine, $m) && $this->lastHeader) {
// continuation of a previous header
if (!is_array($this->headers[$this->lastHeader])) {
$this->headers[$this->lastHeader] .= ' ' . trim($m[1]);
} else {
$key = count($this->headers[$this->lastHeader]) - 1;
$this->headers[$this->lastHeader][$key] .= ' ' . trim($m[1]);
}
}
}
/**
* Parses a Set-Cookie header to fill $cookies array
*
* @param string $cookieString value of Set-Cookie header
*
* @link http://web.archive.org/web/20080331104521/http://cgi.netscape.com/newsref/std/cookie_spec.html
*/
protected function parseCookie($cookieString)
{
$cookie = array(
'expires' => null,
'domain' => null,
'path' => null,
'secure' => false
);
if (!strpos($cookieString, ';')) {
// Only a name=value pair
$pos = strpos($cookieString, '=');
$cookie['name'] = trim(substr($cookieString, 0, $pos));
$cookie['value'] = trim(substr($cookieString, $pos + 1));
} else {
// Some optional parameters are supplied
$elements = explode(';', $cookieString);
$pos = strpos($elements[0], '=');
$cookie['name'] = trim(substr($elements[0], 0, $pos));
$cookie['value'] = trim(substr($elements[0], $pos + 1));
for ($i = 1; $i < count($elements); $i++) {
if (false === strpos($elements[$i], '=')) {
$elName = trim($elements[$i]);
$elValue = null;
} else {
list ($elName, $elValue) = array_map('trim', explode('=', $elements[$i]));
}
$elName = strtolower($elName);
if ('secure' == $elName) {
$cookie['secure'] = true;
} elseif ('expires' == $elName) {
$cookie['expires'] = str_replace('"', '', $elValue);
} elseif ('path' == $elName || 'domain' == $elName) {
$cookie[$elName] = urldecode($elValue);
} else {
$cookie[$elName] = $elValue;
}
}
}
$this->cookies[] = $cookie;
}
/**
* Appends a string to the response body
*
* @param string $bodyChunk part of response body
*/
public function appendBody($bodyChunk)
{
$this->body .= $bodyChunk;
}
/**
* Returns the effective URL of the response
*
* This may be different from the request URL if redirects were followed.
*
* @return string
* @link http://pear.php.net/bugs/bug.php?id=18412
*/
public function getEffectiveUrl()
{
return $this->effectiveUrl;
}
/**
* Returns the status code
*
* @return integer
*/
public function getStatus()
{
return $this->code;
}
/**
* Returns the reason phrase
*
* @return string
*/
public function getReasonPhrase()
{
return $this->reasonPhrase;
}
/**
* Whether response is a redirect that can be automatically handled by HTTP_Request2
*
* @return bool
*/
public function isRedirect()
{
return in_array($this->code, array(300, 301, 302, 303, 307))
&& isset($this->headers['location']);
}
/**
* Returns either the named header or all response headers
*
* @param string $headerName Name of header to return
*
* @return string|array Value of $headerName header (null if header is
* not present), array of all response headers if
* $headerName is null
*/
public function getHeader($headerName = null)
{
if (null === $headerName) {
return $this->headers;
} else {
$headerName = strtolower($headerName);
return isset($this->headers[$headerName])? $this->headers[$headerName]: null;
}
}
/**
* Returns cookies set in response
*
* @return array
*/
public function getCookies()
{
return $this->cookies;
}
/**
* Returns the body of the response
*
* @return string
* @throws HTTP_Request2_Exception if body cannot be decoded
*/
public function getBody()
{
if (0 == strlen($this->body) || !$this->bodyEncoded
|| !in_array(strtolower($this->getHeader('content-encoding')), array('gzip', 'deflate'))
) {
return $this->body;
} else {
if (extension_loaded('mbstring') && (2 & ini_get('mbstring.func_overload'))) {
$oldEncoding = mb_internal_encoding();
mb_internal_encoding('8bit');
}
try {
switch (strtolower($this->getHeader('content-encoding'))) {
case 'gzip':
$decoded = self::decodeGzip($this->body);
break;
case 'deflate':
$decoded = self::decodeDeflate($this->body);
}
} catch (Exception $e) {
}
if (!empty($oldEncoding)) {
mb_internal_encoding($oldEncoding);
}
if (!empty($e)) {
throw $e;
}
return $decoded;
}
}
/**
* Get the HTTP version of the response
*
* @return string
*/
public function getVersion()
{
return $this->version;
}
/**
* Checks whether data starts with GZIP format identification bytes from RFC 1952
*
* @param string $data gzip-encoded (presumably) data
*
* @return bool
*/
public static function hasGzipIdentification($data)
{
return 0 === strcmp(substr($data, 0, 2), "\x1f\x8b");
}
/**
* Tries to parse GZIP format header in the given string
*
* If the header conforms to RFC 1952, its length is returned. If any
* sanity check fails, HTTP_Request2_MessageException is thrown.
*
* Note: This function might be usable outside of HTTP_Request2 so it might
* be good idea to be moved to some common package. (Delian Krustev)
*
* @param string $data Either the complete response body or
* the leading part of it
* @param boolean $dataComplete Whether $data contains complete response body
*
* @return int gzip header length in bytes
* @throws HTTP_Request2_MessageException
* @link http://tools.ietf.org/html/rfc1952
*/
public static function parseGzipHeader($data, $dataComplete = false)
{
// if data is complete, trailing 8 bytes should be present for size and crc32
$length = strlen($data) - ($dataComplete ? 8 : 0);
if ($length < 10 || !self::hasGzipIdentification($data)) {
throw new HTTP_Request2_MessageException(
'The data does not seem to contain a valid gzip header',
HTTP_Request2_Exception::DECODE_ERROR
);
}
$method = ord(substr($data, 2, 1));
if (8 != $method) {
throw new HTTP_Request2_MessageException(
'Error parsing gzip header: unknown compression method',
HTTP_Request2_Exception::DECODE_ERROR
);
}
$flags = ord(substr($data, 3, 1));
if ($flags & 224) {
throw new HTTP_Request2_MessageException(
'Error parsing gzip header: reserved bits are set',
HTTP_Request2_Exception::DECODE_ERROR
);
}
// header is 10 bytes minimum. may be longer, though.
$headerLength = 10;
// extra fields, need to skip 'em
if ($flags & 4) {
if ($length - $headerLength - 2 < 0) {
throw new HTTP_Request2_MessageException(
'Error parsing gzip header: data too short',
HTTP_Request2_Exception::DECODE_ERROR
);
}
$extraLength = unpack('v', substr($data, 10, 2));
if ($length - $headerLength - 2 - $extraLength[1] < 0) {
throw new HTTP_Request2_MessageException(
'Error parsing gzip header: data too short',
HTTP_Request2_Exception::DECODE_ERROR
);
}
$headerLength += $extraLength[1] + 2;
}
// file name, need to skip that
if ($flags & 8) {
if ($length - $headerLength - 1 < 0) {
throw new HTTP_Request2_MessageException(
'Error parsing gzip header: data too short',
HTTP_Request2_Exception::DECODE_ERROR
);
}
$filenameLength = strpos(substr($data, $headerLength), chr(0));
if (false === $filenameLength
|| $length - $headerLength - $filenameLength - 1 < 0
) {
throw new HTTP_Request2_MessageException(
'Error parsing gzip header: data too short',
HTTP_Request2_Exception::DECODE_ERROR
);
}
$headerLength += $filenameLength + 1;
}
// comment, need to skip that also
if ($flags & 16) {
if ($length - $headerLength - 1 < 0) {
throw new HTTP_Request2_MessageException(
'Error parsing gzip header: data too short',
HTTP_Request2_Exception::DECODE_ERROR
);
}
$commentLength = strpos(substr($data, $headerLength), chr(0));
if (false === $commentLength
|| $length - $headerLength - $commentLength - 1 < 0
) {
throw new HTTP_Request2_MessageException(
'Error parsing gzip header: data too short',
HTTP_Request2_Exception::DECODE_ERROR
);
}
$headerLength += $commentLength + 1;
}
// have a CRC for header. let's check
if ($flags & 2) {
if ($length - $headerLength - 2 < 0) {
throw new HTTP_Request2_MessageException(
'Error parsing gzip header: data too short',
HTTP_Request2_Exception::DECODE_ERROR
);
}
$crcReal = 0xffff & crc32(substr($data, 0, $headerLength));
$crcStored = unpack('v', substr($data, $headerLength, 2));
if ($crcReal != $crcStored[1]) {
throw new HTTP_Request2_MessageException(
'Header CRC check failed',
HTTP_Request2_Exception::DECODE_ERROR
);
}
$headerLength += 2;
}
return $headerLength;
}
/**
* Decodes the message-body encoded by gzip
*
* The real decoding work is done by gzinflate() built-in function, this
* method only parses the header and checks data for compliance with
* RFC 1952
*
* @param string $data gzip-encoded data
*
* @return string decoded data
* @throws HTTP_Request2_LogicException
* @throws HTTP_Request2_MessageException
* @link http://tools.ietf.org/html/rfc1952
*/
public static function decodeGzip($data)
{
// If it doesn't look like gzip-encoded data, don't bother
if (!self::hasGzipIdentification($data)) {
return $data;
}
if (!function_exists('gzinflate')) {
throw new HTTP_Request2_LogicException(
'Unable to decode body: gzip extension not available',
HTTP_Request2_Exception::MISCONFIGURATION
);
}
// unpacked data CRC and size at the end of encoded data
$tmp = unpack('V2', substr($data, -8));
$dataCrc = $tmp[1];
$dataSize = $tmp[2];
$headerLength = self::parseGzipHeader($data, true);
// don't pass $dataSize to gzinflate, see bugs #13135, #14370
$unpacked = gzinflate(substr($data, $headerLength, -8));
if (false === $unpacked) {
throw new HTTP_Request2_MessageException(
'gzinflate() call failed',
HTTP_Request2_Exception::DECODE_ERROR
);
} elseif ($dataSize != strlen($unpacked)) {
throw new HTTP_Request2_MessageException(
'Data size check failed',
HTTP_Request2_Exception::DECODE_ERROR
);
} elseif ((0xffffffff & $dataCrc) != (0xffffffff & crc32($unpacked))) {
throw new HTTP_Request2_MessageException(
'Data CRC check failed',
HTTP_Request2_Exception::DECODE_ERROR
);
}
return $unpacked;
}
/**
* Decodes the message-body encoded by deflate
*
* @param string $data deflate-encoded data
*
* @return string decoded data
* @throws HTTP_Request2_LogicException
*/
public static function decodeDeflate($data)
{
if (!function_exists('gzuncompress')) {
throw new HTTP_Request2_LogicException(
'Unable to decode body: gzip extension not available',
HTTP_Request2_Exception::MISCONFIGURATION
);
}
// RFC 2616 defines 'deflate' encoding as zlib format from RFC 1950,
// while many applications send raw deflate stream from RFC 1951.
// We should check for presence of zlib header and use gzuncompress() or
// gzinflate() as needed. See bug #15305
$header = unpack('n', substr($data, 0, 2));
return (0 == $header[1] % 31)? gzuncompress($data): gzinflate($data);
}
}
?>
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