mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-10-22 14:05:37 +02:00
346 lines
9.1 KiB
PHP
346 lines
9.1 KiB
PHP
<?php
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/**
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* Represents a response returned by a controller.
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*
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* @package framework
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* @subpackage control
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*/
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class SS_HTTPResponse {
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/**
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* @var array
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*/
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protected static $status_codes = array(
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100 => 'Continue',
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101 => 'Switching Protocols',
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200 => 'OK',
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201 => 'Created',
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202 => 'Accepted',
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203 => 'Non-Authoritative Information',
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204 => 'No Content',
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205 => 'Reset Content',
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206 => 'Partial Content',
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301 => 'Moved Permanently',
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302 => 'Found',
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303 => 'See Other',
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304 => 'Not Modified',
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305 => 'Use Proxy',
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307 => 'Temporary Redirect',
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400 => 'Bad Request',
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401 => 'Unauthorized',
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403 => 'Forbidden',
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404 => 'Not Found',
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405 => 'Method Not Allowed',
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406 => 'Not Acceptable',
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407 => 'Proxy Authentication Required',
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408 => 'Request Timeout',
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409 => 'Conflict',
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410 => 'Gone',
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411 => 'Length Required',
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412 => 'Precondition Failed',
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413 => 'Request Entity Too Large',
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414 => 'Request-URI Too Long',
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415 => 'Unsupported Media Type',
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416 => 'Request Range Not Satisfiable',
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417 => 'Expectation Failed',
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422 => 'Unprocessable Entity',
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500 => 'Internal Server Error',
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501 => 'Not Implemented',
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502 => 'Bad Gateway',
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503 => 'Service Unavailable',
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504 => 'Gateway Timeout',
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505 => 'HTTP Version Not Supported',
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);
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/**
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* @var array
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*/
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protected static $redirect_codes = array(
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301,
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302,
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303,
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304,
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305,
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307
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);
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/**
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* @var Int
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*/
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protected $statusCode = 200;
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/**
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* @var String
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*/
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protected $statusDescription = "OK";
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/**
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* HTTP Headers like "Content-Type: text/xml"
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*
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* @see http://en.wikipedia.org/wiki/List_of_HTTP_headers
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* @var array
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*/
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protected $headers = array(
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"Content-Type" => "text/html; charset=utf-8",
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);
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/**
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* @var string
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*/
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protected $body = null;
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/**
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* Create a new HTTP response
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*
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* @param $body The body of the response
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* @param $statusCode The numeric status code - 200, 404, etc
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* @param $statusDescription The text to be given alongside the status code.
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* See {@link setStatusCode()} for more information.
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*/
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public function __construct($body = null, $statusCode = null, $statusDescription = null) {
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$this->setBody($body);
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if($statusCode) $this->setStatusCode($statusCode, $statusDescription);
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}
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/**
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* @param String $code
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* @param String $description Optional. See {@link setStatusDescription()}.
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* No newlines are allowed in the description.
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* If omitted, will default to the standard HTTP description
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* for the given $code value (see {@link $status_codes}).
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* @return SS_HTTPRequest $this
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*/
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public function setStatusCode($code, $description = null) {
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if(isset(self::$status_codes[$code])) $this->statusCode = $code;
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else user_error("Unrecognised HTTP status code '$code'", E_USER_WARNING);
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if($description) $this->statusDescription = $description;
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else $this->statusDescription = self::$status_codes[$code];
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return $this;
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}
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/**
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* The text to be given alongside the status code ("reason phrase").
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* Caution: Will be overwritten by {@link setStatusCode()}.
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*
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* @param String $description
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* @return SS_HTTPRequest $this
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*/
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public function setStatusDescription($description) {
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$this->statusDescription = $description;
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return $this;
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}
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/**
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* @return Int
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*/
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public function getStatusCode() {
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return $this->statusCode;
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}
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/**
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* @return string Description for a HTTP status code
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*/
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public function getStatusDescription() {
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return str_replace(array("\r","\n"), '', $this->statusDescription);
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}
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/**
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* Returns true if this HTTP response is in error
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*
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* @return bool
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*/
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public function isError() {
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return $this->statusCode && ($this->statusCode < 200 || $this->statusCode > 399);
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}
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/**
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* @param string $body
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* @return SS_HTTPRequest $this
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*/
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public function setBody($body) {
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$this->body = $body;
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}
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/**
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* @return null|string
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*/
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public function getBody() {
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return $this->body;
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}
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/**
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* Add a HTTP header to the response, replacing any header of the same name.
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*
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* @param string $header Example: "Content-Type"
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* @param string $value Example: "text/xml"
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* @return SS_HTTPRequest $this
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*/
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public function addHeader($header, $value) {
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$this->headers[$header] = $value;
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return $this;
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}
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/**
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* Return the HTTP header of the given name.
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*
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* @param string $header
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* @returns null|string
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*/
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public function getHeader($header) {
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if(isset($this->headers[$header]))
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return $this->headers[$header];
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return null;
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}
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/**
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* @return array
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*/
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public function getHeaders() {
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return $this->headers;
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}
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/**
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* Remove an existing HTTP header by its name,
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* e.g. "Content-Type".
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*
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* @param string $header
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* @return SS_HTTPRequest $this
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*/
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public function removeHeader($header) {
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if(isset($this->headers[$header])) unset($this->headers[$header]);
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return $this;
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}
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/**
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* @param string $dest
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* @param int $code
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* @return SS_HTTPRequest $this
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*/
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public function redirect($dest, $code=302) {
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if(!in_array($code, self::$redirect_codes)) $code = 302;
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$this->setStatusCode($code);
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$this->headers['Location'] = $dest;
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return $this;
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}
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/**
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* Send this HTTPReponse to the browser
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*/
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public function output() {
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// Attach appropriate X-Include-JavaScript and X-Include-CSS headers
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if(Director::is_ajax()) {
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Requirements::include_in_response($this);
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}
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if(in_array($this->statusCode, self::$redirect_codes) && headers_sent($file, $line)) {
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$url = $this->headers['Location'];
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echo
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"<p>Redirecting to <a href=\"$url\" title=\"Click this link if your browser does not redirect you\">"
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. "$url... (output started on $file, line $line)</a></p>
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<meta http-equiv=\"refresh\" content=\"1; url=$url\" />
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<script type=\"text/javascript\">setTimeout('window.location.href = \"$url\"', 50);</script>";
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} else {
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$line = $file = null;
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if(!headers_sent($file, $line)) {
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header($_SERVER['SERVER_PROTOCOL'] . " $this->statusCode " . $this->getStatusDescription());
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foreach($this->headers as $header => $value) {
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header("$header: $value", true, $this->statusCode);
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}
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} else {
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// It's critical that these status codes are sent; we need to report a failure if not.
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if($this->statusCode >= 300) {
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user_error("Couldn't set response type to $this->statusCode because of output on line $line of $file", E_USER_WARNING);
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}
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}
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// Only show error pages or generic "friendly" errors if the status code signifies
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// an error, and the response doesn't have any body yet that might contain
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// a more specific error description.
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if(Director::isLive() && $this->isError() && !$this->body) {
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Debug::friendlyError($this->statusCode, $this->getStatusDescription());
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} else {
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echo $this->body;
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}
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}
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}
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/**
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* Returns true if this response is "finished", that is, no more script execution should be done.
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* Specifically, returns true if a redirect has already been requested
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*
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* @return bool
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*/
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public function isFinished() {
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return in_array($this->statusCode, array(301, 302, 401, 403));
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}
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/**
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* Set content-length in bytes. Should be called right before {@link output()}.
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*/
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public function fixContentLength() {
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// Use mbstring to avoid problems with mb_internal_encoding() and mbstring.func_overload
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$this->headers['Content-Length'] = mb_strlen($this->body,'8bit');
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}
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}
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/**
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* A {@link SS_HTTPResponse} encapsulated in an exception, which can interrupt the processing flow and be caught by the
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* {@link RequestHandler} and returned to the user.
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*
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* Example Usage:
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* <code>
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* throw new SS_HTTPResponse_Exception('This request was invalid.', 400);
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* throw new SS_HTTPResponse_Exception(new SS_HTTPResponse('There was an internal server error.', 500));
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* </code>
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*
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* @package framework
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* @subpackage control
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*/
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class SS_HTTPResponse_Exception extends Exception {
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protected $response;
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/**
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* @param string|SS_HTTPResponse body Either the plaintext content of the error message, or an SS_HTTPResponse
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* object representing it. In either case, the $statusCode and
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* $statusDescription will be the HTTP status of the resulting response.
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* @see SS_HTTPResponse::__construct();
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*/
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public function __construct($body = null, $statusCode = null, $statusDescription = null) {
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if($body instanceof SS_HTTPResponse) {
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// statusCode and statusDescription should override whatever is passed in the body
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if($statusCode) $body->setStatusCode($statusCode);
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if($statusDescription) $body->setStatusDescription($statusDescription);
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$this->setResponse($body);
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} else {
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$response = new SS_HTTPResponse($body, $statusCode, $statusDescription);
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// Error responses should always be considered plaintext, for security reasons
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$response->addHeader('Content-Type', 'text/plain');
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$this->setResponse($response);
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}
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parent::__construct($this->getResponse()->getBody(), $this->getResponse()->getStatusCode());
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}
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/**
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* @return SS_HTTPResponse
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*/
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public function getResponse() {
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return $this->response;
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}
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/**
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* @param SS_HTTPResponse $response
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*/
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public function setResponse(SS_HTTPResponse $response) {
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$this->response = $response;
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}
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}
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