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<?php
/**
 * Class representing a HTTP request message
 *
 * 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 2008-2022 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
 */

/**
 * A class representing an URL as per RFC 3986.
 */
require_once 'Net/URL2.php';

/**
 * Exception class for HTTP_Request2 package
 */
require_once 'HTTP/Request2/Exception.php';

/**
 * Class representing a HTTP request message
 *
 * @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: 2.5.1
 * @link     http://pear.php.net/package/HTTP_Request2
 * @link     http://tools.ietf.org/html/rfc2616#section-5
 */
class HTTP_Request2 implements SplSubject
{
    /**
     * #@+
     * Constants for HTTP request methods
     *
     * @link http://tools.ietf.org/html/rfc2616#section-5.1.1
     */
    const METHOD_OPTIONS = 'OPTIONS';
    const METHOD_GET     = 'GET';
    const METHOD_HEAD    = 'HEAD';
    const METHOD_POST    = 'POST';
    const METHOD_PUT     = 'PUT';
    const METHOD_DELETE  = 'DELETE';
    const METHOD_TRACE   = 'TRACE';
    const METHOD_CONNECT = 'CONNECT';
    /**
     * #@-
     */

    /**
     * #@+
     * Constants for HTTP authentication schemes
     *
     * @link http://tools.ietf.org/html/rfc2617
     */
    const AUTH_BASIC  = 'basic';
    const AUTH_DIGEST = 'digest';
    /**
     * #@-
     */

    /**
     * Regular expression used to check for invalid symbols in RFC 2616 tokens
     *
     * @link http://pear.php.net/bugs/bug.php?id=15630
     */
    const REGEXP_INVALID_TOKEN = '![\x00-\x1f\x7f-\xff()<>@,;:\\\\"/\[\]?={}\s]!';

    /**
     * Regular expression used to check for invalid symbols in cookie strings
     *
     * @link http://pear.php.net/bugs/bug.php?id=15630
     * @link http://web.archive.org/web/20080331104521/http://cgi.netscape.com/newsref/std/cookie_spec.html
     */
    const REGEXP_INVALID_COOKIE = '/[\s,;]/';

    /**
     * Fileinfo magic database resource
     *
     * @var resource
     * @see detectMimeType()
     */
    private static $_fileinfoDb;

    /**
     * Observers attached to the request (instances of SplObserver)
     *
     * @var array
     */
    protected $observers = [];

    /**
     * Request URL
     *
     * @var Net_URL2
     */
    protected $url;

    /**
     * Request method
     *
     * @var string
     */
    protected $method = self::METHOD_GET;

    /**
     * Authentication data
     *
     * @var array
     * @see getAuth()
     */
    protected $auth;

    /**
     * Request headers
     *
     * @var array
     */
    protected $headers = [];

    /**
     * Configuration parameters
     *
     * @var array
     * @see setConfig()
     */
    protected $config = [
        'adapter'           => 'HTTP_Request2_Adapter_Socket',
        'connect_timeout'   => 10,
        'timeout'           => 0,
        'use_brackets'      => true,
        'protocol_version'  => '1.1',
        'buffer_size'       => 16384,
        'store_body'        => true,
        'local_ip'          => null,

        'proxy_host'        => '',
        'proxy_port'        => '',
        'proxy_user'        => '',
        'proxy_password'    => '',
        'proxy_auth_scheme' => self::AUTH_BASIC,
        'proxy_type'        => 'http',

        'ssl_verify_peer'   => true,
        'ssl_verify_host'   => true,
        'ssl_cafile'        => null,
        'ssl_capath'        => null,
        'ssl_local_cert'    => null,
        'ssl_passphrase'    => null,

        'digest_compat_ie'  => false,

        'follow_redirects'  => false,
        'max_redirects'     => 5,
        'strict_redirects'  => false
    ];

    /**
     * Last event in request / response handling, intended for observers
     *
     * @var array
     * @see getLastEvent()
     */
    protected $lastEvent = [
        'name' => 'start',
        'data' => null
    ];

    /**
     * Request body
     *
     * @var string|resource
     * @see setBody()
     */
    protected $body = '';

    /**
     * Array of POST parameters
     *
     * @var array
     */
    protected $postParams = [];

    /**
     * Array of file uploads (for multipart/form-data POST requests)
     *
     * @var array
     */
    protected $uploads = [];

    /**
     * Adapter used to perform actual HTTP request
     *
     * @var HTTP_Request2_Adapter
     */
    protected $adapter;

    /**
     * Cookie jar to persist cookies between requests
     *
     * @var HTTP_Request2_CookieJar
     */
    protected $cookieJar = null;

    /**
     * Constructor. Can set request URL, method and configuration array.
     *
     * Also sets a default value for User-Agent header.
     *
     * @param string|Net_Url2 $url    Request URL
     * @param string          $method Request method
     * @param array           $config Configuration for this Request instance
     */
    public function __construct(
        $url = null, $method = self::METHOD_GET, array $config = []
    ) {
        $this->setConfig($config);
        if (!empty($url)) {
            $this->setUrl($url);
        }
        if (!empty($method)) {
            $this->setMethod($method);
        }
        $this->setHeader(
            'user-agent', 'HTTP_Request2/2.5.1 ' .
            '(https://github.com/pear/HTTP_Request2) PHP/' . phpversion()
        );
    }

    /**
     * Sets the URL for this request
     *
     * If the URL has userinfo part (username & password) these will be removed
     * and converted to auth data. If the URL does not have a path component,
     * that will be set to '/'.
     *
     * @param string|Net_URL2 $url Request URL
     *
     * @return $this
     * @throws HTTP_Request2_LogicException
     */
    public function setUrl($url)
    {
        if (is_string($url)) {
            $url = new Net_URL2(
                $url, [Net_URL2::OPTION_USE_BRACKETS => $this->config['use_brackets']]
            );
        }
        if (!$url instanceof Net_URL2) {
            throw new HTTP_Request2_LogicException(
                'Parameter is not a valid HTTP URL',
                HTTP_Request2_Exception::INVALID_ARGUMENT
            );
        }
        // URL contains username / password?
        if ($url->getUserinfo()) {
            $username = $url->getUser();
            $password = $url->getPassword();
            $this->setAuth(rawurldecode($username), $password? rawurldecode($password): '');
            $url->setUserinfo('');
        }
        if ('' == $url->getPath()) {
            $url->setPath('/');
        }
        $this->url = $url;

        return $this;
    }

    /**
     * Returns the request URL
     *
     * @return Net_URL2
     */
    public function getUrl()
    {
        return $this->url;
    }

    /**
     * Sets the request method
     *
     * @param string $method one of the methods defined in RFC 2616
     *
     * @return $this
     * @throws HTTP_Request2_LogicException if the method name is invalid
     */
    public function setMethod($method)
    {
        // Method name should be a token: http://tools.ietf.org/html/rfc2616#section-5.1.1
        if (preg_match(self::REGEXP_INVALID_TOKEN, $method)) {
            throw new HTTP_Request2_LogicException(
                "Invalid request method '{$method}'",
                HTTP_Request2_Exception::INVALID_ARGUMENT
            );
        }
        $this->method = $method;

        return $this;
    }

    /**
     * Returns the request method
     *
     * @return string
     */
    public function getMethod()
    {
        return $this->method;
    }

    /**
     * Sets the configuration parameter(s)
     *
     * The following parameters are available:
     * <ul>
     *   <li> 'adapter'           - adapter to use (string)</li>
     *   <li> 'connect_timeout'   - Connection timeout in seconds (integer)</li>
     *   <li> 'timeout'           - Total number of seconds a request can take.
     *                              Use 0 for no limit, should be greater than
     *                              'connect_timeout' if set (integer)</li>
     *   <li> 'use_brackets'      - Whether to append [] to array variable names (bool)</li>
     *   <li> 'protocol_version'  - HTTP Version to use, '1.0' or '1.1' (string)</li>
     *   <li> 'buffer_size'       - Buffer size to use for reading and writing (int)</li>
     *   <li> 'store_body'        - Whether to store response body in response object.
     *                              Set to false if receiving a huge response and
     *                              using an Observer to save it (boolean)</li>
     *   <li> 'local_ip'          - Specifies the IP address that will be used for accessing
     *                              the network (string)</li>
     *   <li> 'proxy_type'        - Proxy type, 'http' or 'socks5' (string)</li>
     *   <li> 'proxy_host'        - Proxy server host (string)</li>
     *   <li> 'proxy_port'        - Proxy server port (integer)</li>
     *   <li> 'proxy_user'        - Proxy auth username (string)</li>
     *   <li> 'proxy_password'    - Proxy auth password (string)</li>
     *   <li> 'proxy_auth_scheme' - Proxy auth scheme, one of HTTP_Request2::AUTH_* constants (string)</li>
     *   <li> 'proxy'             - Shorthand for proxy_* parameters, proxy given as URL,
     *                              e.g. 'socks5://localhost:1080/' (string)</li>
     *   <li> 'ssl_verify_peer'   - Whether to verify peer's SSL certificate (bool)</li>
     *   <li> 'ssl_verify_host'   - Whether to check that Common Name in SSL
     *                              certificate matches host name (bool)</li>
     *   <li> 'ssl_cafile'        - Cerificate Authority file to verify the peer
     *                              with (use with 'ssl_verify_peer') (string)</li>
     *   <li> 'ssl_capath'        - Directory holding multiple Certificate
     *                              Authority files (string)</li>
     *   <li> 'ssl_local_cert'    - Name of a file containing local cerificate (string)</li>
     *   <li> 'ssl_passphrase'    - Passphrase with which local certificate
     *                              was encoded (string)</li>
     *   <li> 'digest_compat_ie'  - Whether to imitate behaviour of MSIE 5 and 6
     *                              in using URL without query string in digest
     *                              authentication (boolean)</li>
     *   <li> 'follow_redirects'  - Whether to automatically follow HTTP Redirects (boolean)</li>
     *   <li> 'max_redirects'     - Maximum number of redirects to follow (integer)</li>
     *   <li> 'strict_redirects'  - Whether to keep request method on redirects via status 301 and
     *                              302 (true, needed for compatibility with RFC 2616)
     *                              or switch to GET (false, needed for compatibility with most
     *                              browsers) (boolean)</li>
     * </ul>
     *
     * @param string|array $nameOrConfig configuration parameter name or array
     *                                   ('parameter name' => 'parameter value')
     * @param mixed        $value        parameter value if $nameOrConfig is not an array
     *
     * @return $this
     * @throws HTTP_Request2_LogicException If the parameter is unknown
     */
    public function setConfig($nameOrConfig, $value = null)
    {
        if (is_array($nameOrConfig)) {
            foreach ($nameOrConfig as $name => $value) {
                $this->setConfig($name, $value);
            }

        } elseif ('proxy' == $nameOrConfig) {
            $url = new Net_URL2($value);
            $this->setConfig(
                [
                    'proxy_type'     => $url->getScheme(),
                    'proxy_host'     => $url->getHost(),
                    'proxy_port'     => $url->getPort(),
                    'proxy_user'     => rawurldecode($url->getUser()),
                    'proxy_password' => rawurldecode($url->getPassword())
                ]
            );

        } else {
            if (!array_key_exists($nameOrConfig, $this->config)) {
                throw new HTTP_Request2_LogicException(
                    "Unknown configuration parameter '{$nameOrConfig}'",
                    HTTP_Request2_Exception::INVALID_ARGUMENT
                );
            }
            $this->config[$nameOrConfig] = $value;
        }

        return $this;
    }

    /**
     * Returns the value(s) of the configuration parameter(s)
     *
     * @param string $name parameter name
     *
     * @return mixed   value of $name parameter, array of all configuration
     *                   parameters if $name is not given
     * @throws HTTP_Request2_LogicException If the parameter is unknown
     */
    public function getConfig($name = null)
    {
        if (null === $name) {
            return $this->config;
        } elseif (!array_key_exists($name, $this->config)) {
            throw new HTTP_Request2_LogicException(
                "Unknown configuration parameter '{$name}'",
                HTTP_Request2_Exception::INVALID_ARGUMENT
            );
        }
        return $this->config[$name];
    }

    /**
     * Sets the authentication data
     *
     * @param string $user     user name
     * @param string $password password
     * @param string $scheme   authentication scheme
     *
     * @return $this
     */
    public function setAuth($user, $password = '', $scheme = self::AUTH_BASIC)
    {
        if (empty($user)) {
            $this->auth = null;
        } else {
            $this->auth = [
                'user'     => (string)$user,
                'password' => (string)$password,
                'scheme'   => $scheme
            ];
        }

        return $this;
    }

    /**
     * Returns the authentication data
     *
     * The array has the keys 'user', 'password' and 'scheme', where 'scheme'
     * is one of the HTTP_Request2::AUTH_* constants.
     *
     * @return array
     */
    public function getAuth()
    {
        return $this->auth;
    }

    /**
     * Sets request header(s)
     *
     * The first parameter may be either a full header string 'header: value' or
     * header name. In the former case $value parameter is ignored, in the latter
     * the header's value will either be set to $value or the header will be
     * removed if $value is null. The first parameter can also be an array of
     * headers, in that case method will be called recursively.
     *
     * Note that headers are treated case insensitively as per RFC 2616.
     *
     * <code>
     * $req->setHeader('Foo: Bar'); // sets the value of 'Foo' header to 'Bar'
     * $req->setHeader('FoO', 'Baz'); // sets the value of 'Foo' header to 'Baz'
     * $req->setHeader(array('foo' => 'Quux')); // sets the value of 'Foo' header to 'Quux'
     * $req->setHeader('FOO'); // removes 'Foo' header from request
     * </code>
     *
     * @param string|array      $name    header name, header string ('Header: value')
     *                                   or an array of headers
     * @param string|array|null $value   header value if $name is not an array,
     *                                   header will be removed if value is null
     * @param bool              $replace whether to replace previous header with the
     *                                   same name or append to its value
     *
     * @return $this
     * @throws HTTP_Request2_LogicException
     */
    public function setHeader($name, $value = null, $replace = true)
    {
        if (is_array($name)) {
            foreach ($name as $k => $v) {
                if (is_string($k)) {
                    $this->setHeader($k, $v, $replace);
                } else {
                    $this->setHeader($v, null, $replace);
                }
            }
        } else {
            if (null === $value && strpos($name, ':')) {
                list($name, $value) = array_map('trim', explode(':', $name, 2));
            }
            // Header name should be a token: http://tools.ietf.org/html/rfc2616#section-4.2
            if (preg_match(self::REGEXP_INVALID_TOKEN, $name)) {
                throw new HTTP_Request2_LogicException(
                    "Invalid header name '{$name}'",
                    HTTP_Request2_Exception::INVALID_ARGUMENT
                );
            }
            // Header names are case insensitive anyway
            $name = strtolower($name);
            if (null === $value) {
                unset($this->headers[$name]);

            } else {
                if (is_array($value)) {
                    $value = implode(', ', array_map('trim', $value));
                } elseif (is_string($value)) {
                    $value = trim($value);
                }
                if (!isset($this->headers[$name]) || $replace) {
                    $this->headers[$name] = $value;
                } else {
                    $this->headers[$name] .= ', ' . $value;
                }
            }
        }

        return $this;
    }

    /**
     * Returns the request headers
     *
     * The array is of the form ('header name' => 'header value'), header names
     * are lowercased
     *
     * @return array
     */
    public function getHeaders()
    {
        return $this->headers;
    }

    /**
     * Adds a cookie to the request
     *
     * If the request does not have a CookieJar object set, this method simply
     * appends a cookie to "Cookie:" header.
     *
     * If a CookieJar object is available, the cookie is stored in that object.
     * Data from request URL will be used for setting its 'domain' and 'path'
     * parameters, 'expires' and 'secure' will be set to null and false,
     * respectively. If you need further control, use CookieJar's methods.
     *
     * @param string $name  cookie name
     * @param string $value cookie value
     *
     * @return $this
     * @throws HTTP_Request2_LogicException
     * @see    setCookieJar()
     */
    public function addCookie($name, $value)
    {
        if (!empty($this->cookieJar)) {
            $this->cookieJar->store(
                ['name' => $name, 'value' => $value], $this->url
            );

        } else {
            $cookie = $name . '=' . $value;
            if (preg_match(self::REGEXP_INVALID_COOKIE, $cookie)) {
                throw new HTTP_Request2_LogicException(
                    "Invalid cookie: '{$cookie}'",
                    HTTP_Request2_Exception::INVALID_ARGUMENT
                );
            }
            $cookies = empty($this->headers['cookie'])? '': $this->headers['cookie'] . '; ';
            $this->setHeader('cookie', $cookies . $cookie);
        }

        return $this;
    }

    /**
     * Sets the request body
     *
     * If you provide file pointer rather than file name, it should support
     * fstat() and rewind() operations.
     *
     * @param string|resource|HTTP_Request2_MultipartBody $body       Either a
     *                                                                string with the body or filename containing body or
     *                                                                pointer to an open file or object with multipart body data
     * @param bool                                        $isFilename Whether
     *                                                                first parameter is a filename
     *
     * @return $this
     * @throws HTTP_Request2_LogicException
     */
    public function setBody($body, $isFilename = false)
    {
        if (!$isFilename && !is_resource($body)) {
            if (!$body instanceof HTTP_Request2_MultipartBody) {
                $this->body = (string)$body;
            } else {
                $this->body = $body;
            }
        } else {
            $fileData = $this->fopenWrapper($body, empty($this->headers['content-type']));
            $this->body = $fileData['fp'];
            if (empty($this->headers['content-type'])) {
                $this->setHeader('content-type', $fileData['type']);
            }
        }
        $this->postParams = $this->uploads = [];

        return $this;
    }

    /**
     * Returns the request body
     *
     * @return string|resource|HTTP_Request2_MultipartBody
     */
    public function getBody()
    {
        if (self::METHOD_POST == $this->method
            && (!empty($this->postParams) || !empty($this->uploads))
        ) {
            if (0 === strpos($this->headers['content-type'], 'application/x-www-form-urlencoded')) {
                $body = http_build_query($this->postParams, '', '&');
                if (!$this->getConfig('use_brackets')) {
                    $body = preg_replace('/%5B\d+%5D=/', '=', $body);
                }
                // support RFC 3986 by not encoding '~' symbol (request #15368)
                return str_replace('%7E', '~', $body);

            } elseif (0 === strpos($this->headers['content-type'], 'multipart/form-data')) {
                require_once 'HTTP/Request2/MultipartBody.php';
                return new HTTP_Request2_MultipartBody(
                    $this->postParams, $this->uploads, $this->getConfig('use_brackets')
                );
            }
        }
        return $this->body;
    }

    /**
     * Adds a file to form-based file upload
     *
     * Used to emulate file upload via a HTML form. The method also sets
     * Content-Type of HTTP request to 'multipart/form-data'.
     *
     * If you just want to send the contents of a file as the body of HTTP
     * request you should use setBody() method.
     *
     * If you provide file pointers rather than file names, they should support
     * fstat() and rewind() operations.
     *
     * @param string                $fieldName    name of file-upload field
     * @param string|resource|array $filename     full name of local file,
     *                                            pointer to open file or an array of files
     * @param string                $sendFilename filename to send in the request
     * @param string                $contentType  content-type of file being uploaded
     *
     * @return $this
     * @throws HTTP_Request2_LogicException
     */
    public function addUpload(
        $fieldName, $filename, $sendFilename = null, $contentType = null
    ) {
        if (!is_array($filename)) {
            $fileData = $this->fopenWrapper($filename, empty($contentType));
            $this->uploads[$fieldName] = [
                'fp'        => $fileData['fp'],
                'filename'  => !empty($sendFilename)? $sendFilename
                                :(is_string($filename)? basename($filename): 'anonymous.blob') ,
                'size'      => $fileData['size'],
                'type'      => empty($contentType)? $fileData['type']: $contentType
            ];
        } else {
            $fps = $names = $sizes = $types = [];
            foreach ($filename as $f) {
                if (!is_array($f)) {
                    $f = [$f];
                }
                $fileData = $this->fopenWrapper($f[0], empty($f[2]));
                $fps[]   = $fileData['fp'];
                $names[] = !empty($f[1])? $f[1]
                            :(is_string($f[0])? basename($f[0]): 'anonymous.blob');
                $sizes[] = $fileData['size'];
                $types[] = empty($f[2])? $fileData['type']: $f[2];
            }
            $this->uploads[$fieldName] = [
                'fp' => $fps, 'filename' => $names, 'size' => $sizes, 'type' => $types
            ];
        }
        if (empty($this->headers['content-type'])
            || 'application/x-www-form-urlencoded' == $this->headers['content-type']
        ) {
            $this->setHeader('content-type', 'multipart/form-data');
        }

        return $this;
    }

    /**
     * Adds POST parameter(s) to the request.
     *
     * @param string|array $name  parameter name or array ('name' => 'value')
     * @param mixed        $value parameter value (can be an array)
     *
     * @return $this
     */
    public function addPostParameter($name, $value = null)
    {
        if (!is_array($name)) {
            $this->postParams[$name] = $value;
        } else {
            foreach ($name as $k => $v) {
                $this->addPostParameter($k, $v);
            }
        }
        if (empty($this->headers['content-type'])) {
            $this->setHeader('content-type', 'application/x-www-form-urlencoded');
        }

        return $this;
    }

    #[ReturnTypeWillChange]
    /**
     * Attaches a new observer
     *
     * @param SplObserver $observer any object implementing SplObserver
     *
     * @return void
     */
    public function attach(SplObserver $observer)
    {
        foreach ($this->observers as $attached) {
            if ($attached === $observer) {
                return;
            }
        }
        $this->observers[] = $observer;
    }

    #[ReturnTypeWillChange]
    /**
     * Detaches an existing observer
     *
     * @param SplObserver $observer any object implementing SplObserver
     *
     * @return void
     */
    public function detach(SplObserver $observer)
    {
        foreach ($this->observers as $key => $attached) {
            if ($attached === $observer) {
                unset($this->observers[$key]);
                return;
            }
        }
    }

    #[ReturnTypeWillChange]
    /**
     * Notifies all observers
     *
     * @return void
     */
    public function notify()
    {
        foreach ($this->observers as $observer) {
            $observer->update($this);
        }
    }

    /**
     * Sets the last event
     *
     * Adapters should use this method to set the current state of the request
     * and notify the observers.
     *
     * @param string $name event name
     * @param mixed  $data event data
     *
     * @return void
     */
    public function setLastEvent($name, $data = null)
    {
        $this->lastEvent = [
            'name' => $name,
            'data' => $data
        ];
        $this->notify();
    }

    /**
     * Returns the last event
     *
     * Observers should use this method to access the last change in request.
     * The following event names are possible:
     * <ul>
     *   <li>'connect'                 - after connection to remote server,
     *                                   data is the destination (string)</li>
     *   <li>'disconnect'              - after disconnection from server</li>
     *   <li>'sentHeaders'             - after sending the request headers,
     *                                   data is the headers sent (string)</li>
     *   <li>'sentBodyPart'            - after sending a part of the request body,
     *                                   data is the length of that part (int)</li>
     *   <li>'sentBody'                - after sending the whole request body,
     *                                   data is request body length (int)</li>
     *   <li>'receivedHeaders'         - after receiving the response headers,
     *                                   data is HTTP_Request2_Response object</li>
     *   <li>'receivedBodyPart'        - after receiving a part of the response
     *                                   body, data is that part (string)</li>
     *   <li>'receivedEncodedBodyPart' - as 'receivedBodyPart', but data is still
     *                                   encoded by Content-Encoding</li>
     *   <li>'receivedBody'            - after receiving the complete response
     *                                   body, data is HTTP_Request2_Response object</li>
     *   <li>'warning'                 - a problem arose during the request
     *                                   that is not severe enough to throw
     *                                   an Exception, data is the warning
     *                                   message (string). Currently dispatched if
     *                                   response body was received incompletely.</li>
     * </ul>
     * Different adapters may not send all the event types. Mock adapter does
     * not send any events to the observers.
     *
     * @return array   The array has two keys: 'name' and 'data'
     */
    public function getLastEvent()
    {
        return $this->lastEvent;
    }

    /**
     * Sets the adapter used to actually perform the request
     *
     * You can pass either an instance of a class implementing HTTP_Request2_Adapter
     * or a class name. The method will only try to include a file if the class
     * name starts with HTTP_Request2_Adapter_, it will also try to prepend this
     * prefix to the class name if it doesn't contain any underscores, so that
     * <code>
     * $request->setAdapter('curl');
     * </code>
     * will work.
     *
     * @param string|HTTP_Request2_Adapter $adapter Adapter to use
     *
     * @return $this
     * @throws HTTP_Request2_LogicException
     */
    public function setAdapter($adapter)
    {
        if (is_string($adapter)) {
            if (!class_exists($adapter, false)) {
                if (false === strpos($adapter, '_')) {
                    $adapter = 'HTTP_Request2_Adapter_' . ucfirst($adapter);
                }
                if (!class_exists($adapter, true)
                    && preg_match('/^HTTP_Request2_Adapter_([a-zA-Z0-9]+)$/', $adapter)
                ) {
                    include_once str_replace('_', DIRECTORY_SEPARATOR, $adapter) . '.php';
                }
                if (!class_exists($adapter, false)) {
                    throw new HTTP_Request2_LogicException(
                        "Class {$adapter} not found",
                        HTTP_Request2_Exception::MISSING_VALUE
                    );
                }
            }
            $adapter = new $adapter;
        }
        if (!$adapter instanceof HTTP_Request2_Adapter) {
            throw new HTTP_Request2_LogicException(
                'Parameter is not a HTTP request adapter',
                HTTP_Request2_Exception::INVALID_ARGUMENT
            );
        }
        $this->adapter = $adapter;

        return $this;
    }

    /**
     * Sets the cookie jar
     *
     * A cookie jar is used to maintain cookies across HTTP requests and
     * responses. Cookies from jar will be automatically added to the request
     * headers based on request URL.
     *
     * @param HTTP_Request2_CookieJar|bool $jar Existing CookieJar object, true to
     *                                          create a new one, false to remove
     *
     * @return $this
     * @throws HTTP_Request2_LogicException
     */
    public function setCookieJar($jar = true)
    {
        require_once 'HTTP/Request2/CookieJar.php';

        if ($jar instanceof HTTP_Request2_CookieJar) {
            $this->cookieJar = $jar;
        } elseif (true === $jar) {
            $this->cookieJar = new HTTP_Request2_CookieJar();
        } elseif (!$jar) {
            $this->cookieJar = null;
        } else {
            throw new HTTP_Request2_LogicException(
                'Invalid parameter passed to setCookieJar()',
                HTTP_Request2_Exception::INVALID_ARGUMENT
            );
        }

        return $this;
    }

    /**
     * Returns current CookieJar object or null if none
     *
     * @return HTTP_Request2_CookieJar|null
     */
    public function getCookieJar()
    {
        return $this->cookieJar;
    }

    /**
     * Sends the request and returns the response
     *
     * @throws HTTP_Request2_Exception
     * @return HTTP_Request2_Response
     */
    public function send()
    {
        // Sanity check for URL
        if (!$this->url instanceof Net_URL2
            || !$this->url->isAbsolute()
            || !in_array(strtolower($this->url->getScheme()), ['https', 'http'])
        ) {
            throw new HTTP_Request2_LogicException(
                'HTTP_Request2 needs an absolute HTTP(S) request URL, '
                . ($this->url instanceof Net_URL2
                   ? "'" . $this->url->__toString() . "'" : 'none')
                . ' given',
                HTTP_Request2_Exception::INVALID_ARGUMENT
            );
        }
        if (empty($this->adapter)) {
            $this->setAdapter($this->getConfig('adapter'));
        }
        // force using single byte encoding if mbstring extension overloads
        // strlen() and substr(); see bug #1781, bug #10605
        if (extension_loaded('mbstring') && (2 & ini_get('mbstring.func_overload'))) {
            $oldEncoding = mb_internal_encoding();
            mb_internal_encoding('8bit');
        }

        try {
            return $this->adapter->sendRequest($this);
        } finally {
            if (!empty($oldEncoding)) {
                mb_internal_encoding($oldEncoding);
            }
        }
    }

    /**
     * Wrapper around fopen()/fstat() used by setBody() and addUpload()
     *
     * @param string|resource $file       file name or pointer to open file
     * @param bool            $detectType whether to try autodetecting MIME
     *                                    type of file, will only work if $file is a
     *                                    filename, not pointer
     *
     * @return array array('fp' => file pointer, 'size' => file size, 'type' => MIME type)
     * @throws HTTP_Request2_LogicException
     */
    protected function fopenWrapper($file, $detectType = false)
    {
        if (!is_string($file) && !is_resource($file)) {
            throw new HTTP_Request2_LogicException(
                "Filename or file pointer resource expected",
                HTTP_Request2_Exception::INVALID_ARGUMENT
            );
        }
        $fileData = [
            'fp'   => is_string($file)? null: $file,
            'type' => 'application/octet-stream',
            'size' => 0
        ];
        if (is_string($file)) {
            if (!($fileData['fp'] = @fopen($file, 'rb'))) {
                $error = error_get_last();
                throw new HTTP_Request2_LogicException(
                    $error['message'], HTTP_Request2_Exception::READ_ERROR
                );
            }
            if ($detectType) {
                $fileData['type'] = self::detectMimeType($file);
            }
        }
        if (!($stat = fstat($fileData['fp']))) {
            throw new HTTP_Request2_LogicException(
                "fstat() call failed", HTTP_Request2_Exception::READ_ERROR
            );
        }
        $fileData['size'] = $stat['size'];

        return $fileData;
    }

    /**
     * Tries to detect MIME type of a file
     *
     * The method will try to use fileinfo extension if it is available,
     * deprecated mime_content_type() function in the other case. If neither
     * works, default 'application/octet-stream' MIME type is returned
     *
     * @param string $filename file name
     *
     * @return string  file MIME type
     */
    protected static function detectMimeType($filename)
    {
        // finfo extension from PECL available
        if (function_exists('finfo_open')) {
            if (!isset(self::$_fileinfoDb)) {
                self::$_fileinfoDb = @finfo_open(FILEINFO_MIME);
            }
            if (self::$_fileinfoDb) {
                $info = finfo_file(self::$_fileinfoDb, $filename);
            }
        }
        // (deprecated) mime_content_type function available
        if (empty($info) && function_exists('mime_content_type')) {
            $info = mime_content_type($filename);
        }
        return empty($info)? 'application/octet-stream': $info;
    }
}
?>