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request_handler.php

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<?php
/* SVN FILE: $Id: request__handler_8php-source.html 580 2008-07-01 14:45:49Z gwoo $ */
/**
 * Request object for handling alternative HTTP requests
 *
 * Alternative HTTP requests can come from wireless units like mobile phones, palmtop computers, and the like.
 * These units have no use for Ajax requests, and this Component can tell how Cake should respond to the different
 * needs of a handheld computer and a desktop machine.
 *
 * CakePHP(tm) :  Rapid Development Framework <http://www.cakephp.org/>
 * Copyright 2005-2008, Cake Software Foundation, Inc.
 *                              1785 E. Sahara Avenue, Suite 490-204
 *                              Las Vegas, Nevada 89104
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @filesource
 * @copyright       Copyright 2005-2008, Cake Software Foundation, Inc.
 * @link                http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
 * @package         cake
 * @subpackage      cake.cake.libs.controller.components
 * @since           CakePHP(tm) v 0.10.4.1076
 * @version         $Revision: 580 $
 * @modifiedby      $LastChangedBy: gwoo $
 * @lastmodified    $Date: 2008-07-01 09:45:49 -0500 (Tue, 01 Jul 2008) $
 * @license         http://www.opensource.org/licenses/mit-license.php The MIT License
 */

if (!defined('REQUEST_MOBILE_UA')) {
    define('REQUEST_MOBILE_UA', '(iPhone|MIDP|AvantGo|BlackBerry|J2ME|Opera Mini|DoCoMo|NetFront|Nokia|PalmOS|PalmSource|portalmmm|Plucker|ReqwirelessWeb|SonyEricsson|Symbian|UP\.Browser|Windows CE|Xiino)');
}

/**
 * Request object for handling HTTP requests
 *
 * @package     cake
 * @subpackage  cake.cake.libs.controller.components
 *
 */
class RequestHandlerComponent extends Object {
/**
 * The layout that will be switched to for Ajax requests
 *
 * @var string
 * @access public
 * @see RequestHandler::setAjax()
 */
    var $ajaxLayout = 'ajax';
/**
 * Determines whether or not callbacks will be fired on this component
 *
 * @var boolean
 * @access public
 */
    var $enabled = true;
/**
 * Holds the content-type of the response that is set when using
 * RequestHandler::respondAs()
 *
 * @var string
 * @access private
 */
    var $__responseTypeSet = null;
/**
 * Holds the copy of Controller::$params
 *
 * @var array
 * @access public
 */
    var $params = array();
/**
 * Friendly content-type mappings used to set response types and determine
 * request types.  Can be modified with RequestHandler::setContent()
 *
 * @var array
 * @access private
 * @see RequestHandlerComponent::setContent
 */
    var $__requestContent = array(
        'javascript'    => 'text/javascript',
        'js'            => 'text/javascript',
        'json'          => 'application/json',
        'css'           => 'text/css',
        'html'          => array('text/html', '*/*'),
        'text'          => 'text/plain',
        'txt'           => 'text/plain',
        'csv'           => array('application/vnd.ms-excel', 'text/plain'),
        'form'          => 'application/x-www-form-urlencoded',
        'file'          => 'multipart/form-data',
        'xhtml'         => array('application/xhtml+xml', 'application/xhtml', 'text/xhtml'),
        'xhtml-mobile'  => 'application/vnd.wap.xhtml+xml',
        'xml'           => array('application/xml', 'text/xml'),
        'rss'           => 'application/rss+xml',
        'atom'          => 'application/atom+xml',
        'amf'           => 'application/x-amf',
        'wap'           => array('text/vnd.wap.wml', 'text/vnd.wap.wmlscript', 'image/vnd.wap.wbmp'),
        'wml'           => 'text/vnd.wap.wml',
        'wmlscript'     => 'text/vnd.wap.wmlscript',
        'wbmp'          => 'image/vnd.wap.wbmp',
        'pdf'           => 'application/pdf',
        'zip'           => 'application/x-zip',
        'tar'           => 'application/x-tar'
    );
/**
 * Content-types accepted by the client.  If extension parsing is enabled in the
 * Router, and an extension is detected, the corresponding content-type will be
 * used as the overriding primary content-type accepted.
 *
 * @var array
 * @access private
 * @see Router::parseExtensions()
 */
    var $__acceptTypes = array();
/**
 * The template to use when rendering the given content type.
 *
 * @var string
 * @access private
 */
    var $__renderType = null;
/**
 * Contains the file extension parsed out by the Router
 *
 * @var string
 * @access public
 * @see Router::parseExtensions()
 */
    var $ext = null;
/**
 * Flag set when MIME types have been initialized
 *
 * @var boolean
 * @access private
 * @see RequestHandler::__initializeTypes()
 */
    var $__typesInitialized = false;
/**
 * Constructor. Parses the accepted content types accepted by the client using HTTP_ACCEPT
 *
 */
    function __construct() {
        $this->__acceptTypes = explode(',', env('HTTP_ACCEPT'));

        foreach ($this->__acceptTypes as $i => $type) {
            if (strpos($type, ';')) {
                $type = explode(';', $type);
                $this->__acceptTypes[$i] = $type[0];
            }
        }
        parent::__construct();
    }
/**
 * Initializes the component, gets a reference to Controller::$parameters, and
 * checks to see if a file extension has been parsed by the Router.  If yes, the
 * corresponding content-type is pushed onto the list of accepted content-types
 * as the first item.
 *
 * @param object $controller A reference to the controller
 * @see Router::parseExtensions()
 * @access public
 */
    function initialize(&$controller) {
        if (isset($controller->params['url']['ext'])) {
            $this->ext = $controller->params['url']['ext'];
        }
    }
/**
 * The startup method of the RequestHandler enables several automatic behaviors
 * related to the detection of certain properties of the HTTP request, including:
 *
 * - Disabling layout rendering for Ajax requests (based on the HTTP_X_REQUESTED_WITH header)
 * - If Router::parseExtensions() is enabled, the layout and template type are
 *   switched based on the parsed extension.  For example, if controller/action.xml
 *   is requested, the view path becomes <i>app/views/controller/xml/action.ctp</i>.
 * - If a helper with the same name as the extension exists, it is added to the controller.
 * - If the extension is of a type that RequestHandler understands, it will set that
 *   Content-type in the response header.
 * - If the XML data is POSTed, the data is parsed into an XML object, which is assigned
 *   to the $data property of the controller, which can then be saved to a model object.
 *
 * @param object $controller A reference to the controller
 * @access public
 */
    function startup(&$controller) {
        if (!$this->enabled) {
            return;
        }
        $this->__initializeTypes();
        $controller->params['isAjax'] = $this->isAjax();

        if (!empty($this->ext) && !in_array($this->ext, array('html', 'htm')) && in_array($this->ext, array_keys($this->__requestContent))) {
            $this->renderAs($controller, $this->ext);
        } elseif ($this->isAjax()) {
            $this->renderAs($controller, 'ajax');
        }

        if ($this->requestedWith('xml')) {
            if (!class_exists('XmlNode')) {
                App::import('Core', 'Xml');
            }
            $xml = new Xml(trim(file_get_contents('php://input')));
            if (is_object($xml->child('data')) && count($xml->children) == 1) {
                $controller->data = $xml->child('data');
            } else {
                $controller->data = $xml;
            }
        }
    }
/**
 * Handles (fakes) redirects for Ajax requests using requestAction()
 *
 * @param object $controller A reference to the controller
 * @param mixed $url A string or array containing the redirect location
 * @access public
 */
    function beforeRedirect(&$controller, $url) {
        if (!$this->isAjax()) {
            return;
        }
        foreach ($_POST as $key => $val) {
            unset($_POST[$key]);
        }
        echo $this->requestAction($url, array('return'));
        $this->_stop();
    }
/**
 * Returns true if the current HTTP request is Ajax, false otherwise
 *
 * @return boolean True if call is Ajax
 * @access public
 */
    function isAjax() {
        return env('HTTP_X_REQUESTED_WITH') === "XMLHttpRequest";
    }
/**
 * Returns true if the current HTTP request is coming from a Flash-based client
 *
 * @return boolean True if call is from Flash
 * @access public
 */
    function isFlash() {
        return env('HTTP_USER_AGENT') === "Shockwave Flash";
    }
/**
 * Returns true if the current request is over HTTPS, false otherwise.
 *
 * @return bool True if call is over HTTPS
 * @access public
 */
    function isSSL() {
        return env('HTTPS');
    }
/**
 * Returns true if the current call accepts an XML response, false otherwise
 *
 * @return boolean True if client accepts an XML response
 * @access public
 */
    function isXml() {
        return $this->prefers('xml');
    }
/**
 * Returns true if the current call accepts an RSS response, false otherwise
 *
 * @return boolean True if client accepts an RSS response
 * @access public
 */
    function isRss() {
        return $this->prefers('rss');
    }
/**
 * Returns true if the current call accepts an Atom response, false otherwise
 *
 * @return boolean True if client accepts an RSS response
 * @access public
 */
    function isAtom() {
        return $this->prefers('atom');
    }
/**
 * Returns true if user agent string matches a mobile web browser, or if the
 * client accepts WAP content.
 *
 * @return boolean True if user agent is a mobile web browser
 * @access public
 */
    function isMobile() {
        preg_match('/' . REQUEST_MOBILE_UA . '/i', env('HTTP_USER_AGENT'), $match);
        if (!empty($match) || $this->accepts('wap')) {
            return true;
        }
        return false;
    }
/**
 * Returns true if the client accepts WAP content
 *
 * @return bool
 * @access public
 */
    function isWap() {
        return $this->prefers('wap');
    }
/**
 * Returns true if the current call a POST request
 *
 * @return boolean True if call is a POST
 * @access public
 */
    function isPost() {
        return (strtolower(env('REQUEST_METHOD')) == 'post');
    }
/**
 * Returns true if the current call a PUT request
 *
 * @return boolean True if call is a PUT
 * @access public
 */
    function isPut() {
        return (strtolower(env('REQUEST_METHOD')) == 'put');
    }
/**
 * Returns true if the current call a GET request
 *
 * @return boolean True if call is a GET
 * @access public
 */
    function isGet() {
        return (strtolower(env('REQUEST_METHOD')) == 'get');
    }
/**
 * Returns true if the current call a DELETE request
 *
 * @return boolean True if call is a DELETE
 * @access public
 */
    function isDelete() {
        return (strtolower(env('REQUEST_METHOD')) == 'delete');
    }
/**
 * Gets Prototype version if call is Ajax, otherwise empty string.
 * The Prototype library sets a special "Prototype version" HTTP header.
 *
 * @return string Prototype version of component making Ajax call
 * @access public
 */
    function getAjaxVersion() {
        if (env('HTTP_X_PROTOTYPE_VERSION') != null) {
            return env('HTTP_X_PROTOTYPE_VERSION');
        }
        return false;
    }
/**
 * Adds/sets the Content-type(s) for the given name.  This method allows
 * content-types to be mapped to friendly aliases (or extensions), which allows
 * RequestHandler to automatically respond to requests of that type in the
 * startup method.
 *
 * @param string $name The name of the Content-type, i.e. "html", "xml", "css"
 * @param mixed $type The Content-type or array of Content-types assigned to the name,
 *                    i.e. "text/html", or "application/xml"
 * @access public
 */
    function setContent($name, $type = null) {
        if (is_array($name)) {
            $this->__requestContent = array_merge($this->__requestContent, $name);
            return;
        }
        $this->__requestContent[$name] = $type;
    }
/**
 * Gets the server name from which this request was referred
 *
 * @return string Server address
 * @access public
 */
    function getReferrer() {
        if (env('HTTP_HOST') != null) {
            $sess_host = env('HTTP_HOST');
        }

        if (env('HTTP_X_FORWARDED_HOST') != null) {
            $sess_host = env('HTTP_X_FORWARDED_HOST');
        }
        return trim(preg_replace('/:.*/', '', $sess_host));
    }
/**
 * Gets remote client IP
 *
 * @return string Client IP address
 * @access public
 */
    function getClientIP() {
        if (env('HTTP_X_FORWARDED_FOR') != null) {
            $ipaddr = preg_replace('/,.*/', '', env('HTTP_X_FORWARDED_FOR'));
        } else {
            if (env('HTTP_CLIENT_IP') != null) {
                $ipaddr = env('HTTP_CLIENT_IP');
            } else {
                $ipaddr = env('REMOTE_ADDR');
            }
        }

        if (env('HTTP_CLIENTADDRESS') != null) {
            $tmpipaddr = env('HTTP_CLIENTADDRESS');

            if (!empty($tmpipaddr)) {
                $ipaddr = preg_replace('/,.*/', '', $tmpipaddr);
            }
        }
        return trim($ipaddr);
    }
/**
 * Determines which content types the client accepts.  Acceptance is based on
 * the file extension parsed by the Router (if present), and by the HTTP_ACCEPT
 * header.
 *
 * @param mixed $type Can be null (or no parameter), a string type name, or an
 *                  array of types
 * @return mixed If null or no parameter is passed, returns an array of content
 *              types the client accepts.  If a string is passed, returns true
 *              if the client accepts it.  If an array is passed, returns true
 *              if the client accepts one or more elements in the array.
 * @access public
 * @see RequestHandlerComponent::setContent()
 */
    function accepts($type = null) {
        $this->__initializeTypes();

        if ($type == null) {
            return $this->mapType($this->__acceptTypes);

        } elseif (is_array($type)) {
            foreach ($type as $t) {
                if ($this->accepts($t) == true) {
                    return true;
                }
            }
            return false;
        } elseif (is_string($type)) {

            if (!in_array($type, array_keys($this->__requestContent))) {
                return false;
            }

            $content = $this->__requestContent[$type];

            if (is_array($content)) {
                foreach ($content as $c) {
                    if (in_array($c, $this->__acceptTypes)) {
                        return true;
                    }
                }
            } else {
                if (in_array($content, $this->__acceptTypes)) {
                    return true;
                }
            }
        }
    }
/**
 * Determines the content type of the data the client has sent (i.e. in a POST request)
 *
 * @param mixed $type Can be null (or no parameter), a string type name, or an array of types
 * @access public
 */
    function requestedWith($type = null) {
        if (!$this->isPost() && !$this->isPut()) {
            return null;
        }

        if ($type == null) {
            return $this->mapType(env('CONTENT_TYPE'));
        } elseif (is_array($type)) {
            foreach ($type as $t) {
                if ($this->requestedWith($t)) {
                    return $this->mapType($t);
                }
            }
            return false;
        } elseif (is_string($type)) {
            return ($type == $this->mapType(env('CONTENT_TYPE')));
        }
    }
/**
 * Determines which content-types the client prefers.  If no parameters are given,
 * the content-type that the client most likely prefers is returned.  If $type is
 * an array, the first item in the array that the client accepts is returned.
 * Preference is determined primarily by the file extension parsed by the Router
 * if provided, and secondarily by the list of content-types provided in
 * HTTP_ACCEPT.
 *
 * @param mixed $type An optional array of 'friendly' content-type names, i.e.
 *                     'html', 'xml', 'js', etc.
 * @return mixed If $type is null or not provided, the first content-type in the
 *                list, based on preference, is returned.
 * @access public
 * @see RequestHandlerComponent::setContent()
 */
    function prefers($type = null) {
        $this->__initializeTypes();
        if ($type == null) {
            if (empty($this->ext)) {
                $accept = $this->accepts(null);
                if (is_array($accept)) {
                    return $accept[0];
                }
                return $accept;
            } else {
                return $this->ext;
            }
        }
        App::import('Core', 'Set');
        $types = Set::normalize($type, false);
        $accepts = array();

        foreach ($types as $type) {
            if ($this->accepts($type)) {
                $accepts[] = $type;
            }
        }

        if (count($accepts) == 0) {
            return false;
        } elseif (count($accepts) == 1) {
            return $accepts[0];
        } else {
            $accepts = array_intersect($this->__acceptTypes, $accepts);
            return $accepts[0];
        }
    }
/**
 * Sets the layout and template paths for the content type defined by $type.
 *
 * @param object $controller A reference to a controller object
 * @param string $type Type of response to send (e.g: 'ajax')
 * @access public
 * @see RequestHandlerComponent::setContent()
 * @see RequestHandlerComponent::respondAs()
 */
    function renderAs(&$controller, $type) {
        $this->__initializeTypes();
        $options = array('charset' => 'UTF-8');

        if (Configure::read('App.encoding') !== null) {
            $options = array('charset' => Configure::read('App.encoding'));
        }

        if ($type == 'ajax') {
            $controller->layout = $this->ajaxLayout;
            return $this->respondAs('html', $options);
        }
        $controller->ext = '.ctp';

        if (empty($this->__renderType)) {
            $controller->viewPath .= '/' . $type;
        } else {
            $controller->viewPath = preg_replace("/\/{$type}$/", '/' . $type, $controller->viewPath);
        }
        $this->__renderType = $type;
        $controller->layoutPath = $type;

        if (in_array($type, array_keys($this->__requestContent))) {
            $this->respondAs($type, $options);
        }

        $helper = ucfirst($type);
        if (!in_array($helper, $controller->helpers) && !array_key_exists($helper, $controller->helpers)) {
            if (App::import('Helper', $helper)) {
                $controller->helpers[] = $helper;
            }
        }
    }
/**
 * Sets the response header based on type map index name.  If DEBUG is greater
 * than 2, the header is not set.
 *
 * @param mixed $type Friendly type name, i.e. 'html' or 'xml', or a full
 *                    content-type, like 'application/x-shockwave'.
 * @param array $options If $type is a friendly type name that is associated with
 *                     more than one type of content, $index is used to select
 *                     which content-type to use.
 * @return boolean Returns false if the friendly type name given in $type does
 *                 not exist in the type map, or if the Content-type header has
 *                 already been set by this method.
 * @access public
 * @see RequestHandlerComponent::setContent()
 */
    function respondAs($type, $options = array()) {
        $this->__initializeTypes();
        if ($this->__responseTypeSet != null) {
            return false;
        }
        if (!array_key_exists($type, $this->__requestContent) && strpos($type, '/') === false) {
            return false;
        }
        $options = array_merge(array('index' => 0, 'charset' => null, 'attachment' => false), $options);

        if (strpos($type, '/') === false && isset($this->__requestContent[$type])) {
            $cType = null;
            if (is_array($this->__requestContent[$type]) && isset($this->__requestContent[$type][$options['index']])) {
                $cType = $this->__requestContent[$type][$options['index']];
            } elseif (is_array($this->__requestContent[$type]) && isset($this->__requestContent[$type][0])) {
                $cType = $this->__requestContent[$type][0];
            } elseif (isset($this->__requestContent[$type])) {
                $cType = $this->__requestContent[$type];
            } else {
                return false;
            }
            if (is_array($cType)) {
                if ($this->prefers($cType)) {
                    $cType = $this->prefers($cType);
                } else {
                    $cType = $cType[0];
                }
            }
        } else {
            $cType = $type;
        }

        if ($cType != null) {
            $header = 'Content-type: ' . $cType;

            if (!empty($options['charset'])) {
                $header .= '; charset=' . $options['charset'];
            }
            if (!empty($options['attachment'])) {
                header('Content-Disposition: attachment; filename="' . $options['attachment'] . '"');
            }
            if (Configure::read() < 2 && !defined('CAKEPHP_SHELL')) {
                @header($header);
            }
            $this->__responseTypeSet = $cType;
            return true;
        } else {
            return false;
        }
    }
/**
 * Returns the current response type (Content-type header), or null if none has been set
 *
 * @return mixed A string content type alias, or raw content type if no alias map exists,
 *               otherwise null
 * @access public
 */
    function responseType() {
        if ($this->__responseTypeSet == null) {
            return null;
        }
        return $this->mapType($this->__responseTypeSet);
    }
/**
 * Maps a content-type back to an alias
 *
 * @param mixed $type Content type
 * @return mixed Alias
 * @access public
 */
    function mapType($ctype) {
        if (is_array($ctype)) {
            $out = array();
            foreach ($ctype as $t) {
                $out[] = $this->mapType($t);
            }
            return $out;
        } else {
            $keys = array_keys($this->__requestContent);
            $count = count($keys);

            for ($i = 0; $i < $count; $i++) {
                $name = $keys[$i];
                $type = $this->__requestContent[$name];

                if (is_array($type) && in_array($ctype, $type)) {
                    return $name;
                } elseif (!is_array($type) && $type == $ctype) {
                    return $name;
                }
            }
            return $ctype;
        }
    }
/**
 * Initializes MIME types
 *
 * @return void
 * @access private
 */
    function __initializeTypes() {
        if ($this->__typesInitialized) {
            return;
        }
        if (isset($this->__requestContent[$this->ext])) {
            $content = $this->__requestContent[$this->ext];
            if (is_array($content)) {
                $content = $content[0];
            }
            array_unshift($this->__acceptTypes, $content);
        }
        $this->__typesInitialized = true;
    }
}

?>

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