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<?php

namespace Sabre\HTTP;

/**
 * HTTP Request information
 *
 * This object can be used to easily access information about an HTTP request.
 * It can additionally be used to create 'mock' requests.
 *
 * This class mostly operates independent, but because of the nature of a single
 * request per run it can operate as a singleton. For more information check out
 * the behaviour around 'defaultInputStream'.
 *
 * @copyright Copyright (C) 2007-2015 fruux GmbH (https://fruux.com/).
 * @author Evert Pot (http://evertpot.com/)
 * @license http://sabre.io/license/ Modified BSD License
 */
class Request {

    /**
     * PHP's $_SERVER data
     *
     * @var array
     */
    protected $_SERVER;

    /**
     * PHP's $_POST data
     *
     * @var array
     */
    protected $_POST;

    /**
     * The request body, if any.
     *
     * This is stored in the form of a stream resource.
     *
     * @var resource
     */
    protected $body = null;

    /**
     * This will be set as the 'default' inputStream for a specific HTTP request
     * We sometimes need to retain, or rebuild this if we need multiple runs
     * of parsing the original HTTP request.
     *
     * @var resource
     */
    static $defaultInputStream=null;

    /**
     * Sets up the object
     *
     * The serverData and postData array can be used to override usage of PHP's
     * global _SERVER and _POST variable respectively.
     *
     * @param array $serverData
     * @param array $postData
     */
    public function __construct(array $serverData = null, array $postData = null) {

       if ($serverData) $this->_SERVER = $serverData;
       else $this->_SERVER =& $_SERVER;

       if ($postData) $this->_POST = $postData;
       else $this->_POST =& $_POST;

    }

    /**
     * Returns the value for a specific http header.
     *
     * This method returns null if the header did not exist.
     *
     * @param string $name
     * @return string
     */
    public function getHeader($name) {

        $name = strtoupper(str_replace(array('-'),array('_'),$name));
        if (isset($this->_SERVER['HTTP_' . $name])) {
            return $this->_SERVER['HTTP_' . $name];
        }

        // There's a few headers that seem to end up in the top-level
        // server array.
        switch($name) {
            case 'CONTENT_TYPE' :
            case 'CONTENT_LENGTH' :
                if (isset($this->_SERVER[$name])) {
                    return $this->_SERVER[$name];
                }
                break;

        }
        return;

    }

    /**
     * Returns all (known) HTTP headers.
     *
     * All headers are converted to lower-case, and additionally all underscores
     * are automatically converted to dashes
     *
     * @return array
     */
    public function getHeaders() {

        $hdrs = array();
        foreach($this->_SERVER as $key=>$value) {

            switch($key) {
                case 'CONTENT_LENGTH' :
                case 'CONTENT_TYPE' :
                    $hdrs[strtolower(str_replace('_','-',$key))] = $value;
                    break;
                default :
                    if (strpos($key,'HTTP_')===0) {
                        $hdrs[substr(strtolower(str_replace('_','-',$key)),5)] = $value;
                    }
                    break;
            }

        }

        return $hdrs;

    }

    /**
     * Returns the HTTP request method
     *
     * This is for example POST or GET
     *
     * @return string
     */
    public function getMethod() {

        return $this->_SERVER['REQUEST_METHOD'];

    }

    /**
     * Returns the requested uri
     *
     * @return string
     */
    public function getUri() {

        return $this->_SERVER['REQUEST_URI'];

    }

    /**
     * Will return protocol + the hostname + the uri
     *
     * @return string
     */
    public function getAbsoluteUri() {

        // Checking if the request was made through HTTPS. The last in line is for IIS
        $protocol = isset($this->_SERVER['HTTPS']) && ($this->_SERVER['HTTPS']) && ($this->_SERVER['HTTPS']!='off');
        return ($protocol?'https':'http') . '://'  . $this->getHeader('Host') . $this->getUri();

    }

    /**
     * Returns everything after the ? from the current url
     *
     * @return string
     */
    public function getQueryString() {

        return isset($this->_SERVER['QUERY_STRING'])?$this->_SERVER['QUERY_STRING']:'';

    }

    /**
     * Returns the HTTP request body body
     *
     * This method returns a readable stream resource.
     * If the asString parameter is set to true, a string is sent instead.
     *
     * @param bool $asString
     * @return resource
     */
    public function getBody($asString = false) {

        if (is_null($this->body)) {
            if (!is_null(self::$defaultInputStream)) {
                $this->body = self::$defaultInputStream;
            } else {
                $this->body = fopen('php://input','r');
                self::$defaultInputStream = $this->body;
            }
        }
        if ($asString) {
            $body = stream_get_contents($this->body);
            return $body;
        } else {
            return $this->body;
        }

    }

    /**
     * Sets the contents of the HTTP request body
     *
     * This method can either accept a string, or a readable stream resource.
     *
     * If the setAsDefaultInputStream is set to true, it means for this run of the
     * script the supplied body will be used instead of php://input.
     *
     * @param mixed $body
     * @param bool $setAsDefaultInputStream
     * @return void
     */
    public function setBody($body,$setAsDefaultInputStream = false) {

        if(is_resource($body)) {
            $this->body = $body;
        } else {

            $stream = fopen('php://temp','r+');
            fputs($stream,$body);
            rewind($stream);
            // String is assumed
            $this->body = $stream;
        }
        if ($setAsDefaultInputStream) {
            self::$defaultInputStream = $this->body;
        }

    }

    /**
     * Returns PHP's _POST variable.
     *
     * The reason this is in a method is so it can be subclassed and
     * overridden.
     *
     * @return array
     */
    public function getPostVars() {

        return $this->_POST;

    }

    /**
     * Returns a specific item from the _SERVER array.
     *
     * Do not rely on this feature, it is for internal use only.
     *
     * @param string $field
     * @return string
     */
    public function getRawServerValue($field) {

        return isset($this->_SERVER[$field])?$this->_SERVER[$field]:null;

    }

    /**
     * Returns the HTTP version specified within the request.
     *
     * @return string
     */
    public function getHTTPVersion() {

        $protocol = $this->getRawServerValue('SERVER_PROTOCOL');
        if ($protocol==='HTTP/1.0') {
            return '1.0';
        } else {
            return '1.1';
        }

    }

}