<?php
/**
 * CakeRequest 
 *
 * PHP 5
 *
 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
 * Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
 * @link          http://cakephp.org CakePHP(tm) Project
 * @package       cake
 * @subpackage    cake.cake.libs
 * @since         CakePHP(tm) v 2.0
 * @license       MIT License (http://www.opensource.org/licenses/mit-license.php)
 */
App::import('Core', 'Set');

/**
 * A class that helps wrap Request information and particulars about a single request.
 * Provides methods commonly used to introspect on the request headers and request body.
 * 
 * Has both an Array and Object interface. You can access framework parameters using indexes:
 *
 * `$request['controller']` or `$request->controller`.
 *
 */
class CakeRequest implements ArrayAccess {
/**
 * Array of parameters parsed from the url.
 *
 * @var array
 */
	public $params = array();

/**
 * Array of POST data.  Will contain form data as well as uploaded files.
 * Will only contain data from inputs that start with 'data'.  So
 * `<input name="some_input" />` will not end up in data. However,
 * `<input name="data[something]" />`
 *
 * @var array
 */
	public $data = array();

/**
 * Array of querystring arguments
 *
 * @var array
 */
	public $query = array();

/**
 * The url string used for the request.
 *
 * @var string
 */
	public $url;

/**
 * Base url path.
 *
 * @var string
 */
	public $base = false;

/**
 * webroot path segment for the request.
 *
 * @var string
 */
	public $webroot = '/';

/**
 * The full address to the current request
 *
 * @var string
 */
	public $here = null;

/**
 * The built in detectors used with `is()` can be modified with `addDetector()`.
 *
 * There are several ways to specify a detector, see CakeRequest::addDetector() for the 
 * various formats and ways to define detectors.
 *
 * @var array
 */
	protected $_detectors = array(
		'get' => array('env' => 'REQUEST_METHOD', 'value' => 'GET'),
		'post' => array('env' => 'REQUEST_METHOD', 'value' => 'POST'),
		'put' => array('env' => 'REQUEST_METHOD', 'value' => 'PUT'),
		'delete' => array('env' => 'REQUEST_METHOD', 'value' => 'DELETE'),
		'head' => array('env' => 'REQUEST_METHOD', 'value' => 'HEAD'),
		'options' => array('env' => 'REQUEST_METHOD', 'value' => 'OPTIONS'),
		'ssl' => array('env' => 'HTTPS', 'value' => 1),
		'ajax' => array('env' => 'HTTP_X_REQUESTED_WITH', 'value' => 'XMLHttpRequest'),
		'flash' => array('env' => 'HTTP_USER_AGENT', 'pattern' => '/^(Shockwave|Adobe) Flash/'),
		'mobile' => array('env' => 'HTTP_USER_AGENT', 'options' => array(
			'Android', 'AvantGo', 'BlackBerry', 'DoCoMo', 'iPod', 'iPhone',
			'J2ME', 'MIDP', 'NetFront', 'Nokia', 'Opera Mini', 'PalmOS', 'PalmSource',
			'portalmmm', 'Plucker', 'ReqwirelessWeb', 'SonyEricsson', 'Symbian', 'UP\\.Browser',
			'webOS', 'Windows CE', 'Xiino'
		))
	);
/**
 * Constructor 
 *
 * @param string $url Trimmed url string to use.  Should not contain the application base path.
 * @param boolean $parseEnvironment Set to false to not auto parse the environment. ie. GET, POST and FILES.
 * @return void
 */
	public function __construct($url = null, $parseEnvironment = true) {
		$this->base = $this->_base();
		if (empty($url)) {
			$url = $this->_url();
		}
		if ($url[0] == '/') {
			$url = substr($url, 1);
		}
		$this->url = $url;

		if ($parseEnvironment) {
			$this->_processPost();
			$this->_processGet();
			$this->_processFiles();
		}
		$this->here = $this->base . '/' . $this->url;
	}

/**
 * process the post data and set what is there into the object.
 *
 * @return void
 */
	protected function _processPost() {
		$this->params['form'] = $_POST;
		if (ini_get('magic_quotes_gpc') === '1') {
			$this->params['form'] = stripslashes_deep($this->params['form']);
		}
		if (env('HTTP_X_HTTP_METHOD_OVERRIDE')) {
			$this->params['form']['_method'] = env('HTTP_X_HTTP_METHOD_OVERRIDE');
		}
		if (isset($this->params['form']['_method'])) {
			if (!empty($_SERVER)) {
				$_SERVER['REQUEST_METHOD'] = $this->params['form']['_method'];
			} else {
				$_ENV['REQUEST_METHOD'] = $this->params['form']['_method'];
			}
			unset($this->params['form']['_method']);
		}
		if (isset($this->params['form']['data'])) {
			$this->data = $this->params['form']['data'];
			unset($this->params['form']['data']);
		}
	}

/**
 * Process the GET parameters and move things into the object.
 *
 * @return void
 */
	protected function _processGet() {
		if (ini_get('magic_quotes_gpc') === '1') {
			$query = stripslashes_deep($_GET);
		} else {
			$query = $_GET;
		}
		if (strpos($this->url, '?') !== false) {
			list(, $querystr) = explode('?', $this->url);
			parse_str($querystr, $queryArgs);
			$query += $queryArgs;	
		}
		if (isset($this->params['url'])) {
			$query = array_merge($this->params['url'], $query);
		}
		$query['url'] = $this->url;
		$this->query = $query;
	}

/**
 * Returns the REQUEST_URI from the server environment, or, failing that,
 * constructs a new one, using the PHP_SELF constant and other variables.
 *
 * @return string URI
 */
	protected function _uri() {
		foreach (array('HTTP_X_REWRITE_URL', 'REQUEST_URI', 'argv') as $var) {
			if ($uri = env($var)) {
				if ($var == 'argv') {
					$uri = $uri[0];
				}
				break;
			}
		}

		$base = trim(Configure::read('App.baseUrl'), '/');

		if ($base) {
			$uri = preg_replace('/^(?:\/)?(?:' . preg_quote($base, '/') . ')?(?:url=)?/', '', $uri);
		}
		if (PHP_SAPI == 'isapi') {
			$uri = preg_replace('/^(?:\/)?(?:\/)?(?:\?)?(?:url=)?/', '', $uri);
		}
		if (!empty($uri)) {
			if (key($_GET) && strpos(key($_GET), '?') !== false) {
				unset($_GET[key($_GET)]);
			}
			$uri = explode('?', $uri, 2);

			if (isset($uri[1])) {
				parse_str($uri[1], $_GET);
			}
			$uri = $uri[0];
		} else {
			$uri = env('QUERY_STRING');
		}
		if (is_string($uri) && strpos($uri, 'index.php') !== false) {
			list(, $uri) = explode('index.php', $uri, 2);
		}
		if (empty($uri) || $uri == '/' || $uri == '//') {
			return '';
		}
		return str_replace('//', '/', '/' . $uri);
	}

/**
 * Returns and sets the $_GET[url] derived from the REQUEST_URI
 *
 * @return string URL
 */
	protected function _url() {
		if (empty($_GET['url'])) {
			$uri = $this->_uri();
			$base = $this->base;

			$url = null;
			$tmpUri = preg_replace('/^(?:\?)?(?:\/)?/', '', $uri);
			$baseDir = trim(dirname($base) . '/', '/');

			if ($tmpUri === '/' || $tmpUri == $baseDir || $tmpUri == $base) {
				$url = '/';
			} else {
				$elements = array();
				if ($base && strpos($uri, $base) !== false) {
					$elements = explode($base, $uri);
				} elseif (preg_match('/^[\/\?\/|\/\?|\?\/]/', $uri)) {
					$elements = array(1 => preg_replace('/^[\/\?\/|\/\?|\?\/]/', '', $uri));
				}

				if (!empty($elements[1])) {
					$url = $elements[1];
				} else {
					$url = '/';
				}
			}
		} else {
			$url = $_GET['url'];
		}
		return $url;
	}

/**
 * Returns a base URL and sets the proper webroot
 *
 * @return string Base URL
 */
	protected function _base() {
		$dir = $webroot = null;
		$config = Configure::read('App');
		extract($config);

		if (!$base) {
			$base = $this->base;
		}

		if ($base !== false) {
			$this->webroot = $base . '/';
			return $base;
		}
		if (!$baseUrl) {
			$replace = array('<', '>', '*', '\'', '"');
			$base = str_replace($replace, '', dirname(env('PHP_SELF')));

			if ($webroot === 'webroot' && $webroot === basename($base)) {
				$base = dirname($base);
			}
			if ($dir === 'app' && $dir === basename($base)) {
				$base = dirname($base);
			}

			if ($base === DS || $base === '.') {
				$base = '';
			}

			$this->webroot = $base .'/';
			return $base;
		}

		$file = '/' . basename($baseUrl);
		$base = dirname($baseUrl);

		if ($base === DS || $base === '.') {
			$base = '';
		}
		$this->webroot = $base .'/';

		if (!empty($base)) {
			if (strpos($this->webroot, $dir) === false) {
				$this->webroot .= $dir . '/' ;
			}
			if (strpos($this->webroot, $webroot) === false) {
				$this->webroot .= $webroot . '/';
			}
		}
		return $base . $file;
	}

/**
 * Process $_FILES and move things into the object.
 *
 * @return void
 */
	protected function _processFiles() {
		if (isset($_FILES) && is_array($_FILES)) {
			foreach ($_FILES as $name => $data) {
				if ($name != 'data') {
					$this->params['form'][$name] = $data;
				}
			}
		}

		if (isset($_FILES['data'])) {
			foreach ($_FILES['data'] as $key => $data) {
				foreach ($data as $model => $fields) {
					if (is_array($fields)) {
						foreach ($fields as $field => $value) {
							if (is_array($value)) {
								foreach ($value as $k => $v) {
									$this->data[$model][$field][$k][$key] = $v;
								}
							} else {
								$this->data[$model][$field][$key] = $value;
							}
						}
					} else {
						$this->data[$model][$key] = $fields;
					}
				}
			}
		}
	}

/**
 * Get the IP the client is using, or says they are using.
 *
 * @param boolean $safe Use safe = false when you think the user might manipulate their HTTP_CLIENT_IP
 *   header.  Setting $safe = false will will also look at HTTP_X_FORWARDED_FOR
 * @return string The client IP.
 */
	public function clientIp($safe = true) {
		if (!$safe && 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);
	}

/**
 * Returns the referer that referred this request.
 *
 * @param boolean $local Attempt to return a local address. Local addresses do not contain hostnames.
 * @return string The referring address for this request.
 */
	public function referer($local = false) {
		$ref = env('HTTP_REFERER');
		$forwarded = env('HTTP_X_FORWARDED_HOST');
		if ($forwarded) {
			$ref = $forwarded;
		}

		$base = '';
		if (defined('FULL_BASE_URL')) {
			$base = FULL_BASE_URL . $this->webroot;
		}
		if (!empty($ref) && !empty($base)) {
			if ($local && strpos($ref, $base) === 0) {
				$ref = substr($ref, strlen($base));
				if ($ref[0] != '/') {
					$ref = '/' . $ref;
				}
				return $ref;
			} elseif (!$local) {
				return $ref;
			}
		}
		return '/';
	}

/**
 * Missing method handler, handles wrapping older style isAjax() type methods
 *
 * @param string $name The method called
 * @param array $params Array of parameters for the method call
 * @return mixed
 * @throws BadMethodCallException when an invalid method is called.
 */
	public function __call($name, $params) {
		if (strpos($name, 'is') === 0) {
			$type = strtolower(substr($name, 2));
			return $this->is($type);
		}
		throw new BadMethodCallException(sprintf('Method %s does not exist', $name));
	}

/**
 * Magic get method allows access to parsed routing parameters directly on the object.
 *
 * Allows access to `$this->params['controller']` via `$this->controller`
 *
 * @param string $name The property being accessed.
 * @return mixed Either the value of the parameter or null.
 */
	public function __get($name) {
		if (isset($this->params[$name])) {
			return $this->params[$name];
		}
		return null;
	}

/**
 * Check whether or not a Request is a certain type.  Uses the built in detection rules
 * as well as additional rules defined with CakeRequest::addDetector().  Any detector can be called 
 * as `is($type)` or `is$Type()`.
 *
 * @param string $type The type of request you want to check.
 * @return boolean Whether or not the request is the type you are checking.
 */
	public function is($type) {
		$type = strtolower($type);
		if (!isset($this->_detectors[$type])) {
			return false;
		}
		$detect = $this->_detectors[$type];
		if (isset($detect['env'])) {
			if (isset($detect['value'])) {
				return env($detect['env']) == $detect['value'];
			}
			if (isset($detect['pattern'])) {
				return (bool)preg_match($detect['pattern'], env($detect['env']));
			}
			if (isset($detect['options'])) {
				$pattern = '/' . implode('|', $detect['options']) . '/i';
				return (bool)preg_match($pattern, env($detect['env']));
			}
		}
		if (isset($detect['callback']) && is_callable($detect['callback'])) {
			return call_user_func($detect['callback'], $this);
		}
		return false;
	}

/**
 * Add a new detector to the list of detectors that a request can use.
 * There are several different formats and types of detectors that can be set.
 *
 * ### Environment value comparison
 *
 * An environment value comparison, compares a value fetched from `env()` to a known value
 * the environment value is equality checked against the provided value.
 *
 * e.g `addDetector('post', array('env' => 'REQUEST_METHOD', 'value' => 'POST'))`
 *
 * ### Pattern value comparison
 *
 * Pattern value comparison allows you to compare a value fetched from `env()` to a regular expression.
 * 
 * e.g `addDetector('iphone', array('env' => 'HTTP_USER_AGENT', 'pattern' => '/iPhone/i'));`
 *
 * ### Option based comparison
 *
 * Option based comparisons use a list of options to create a regular expression.  Subsequent calls
 * to add an already defined options detector will merge the options.
 *
 * e.g `addDetector('mobile', array('env' => 'HTTP_USER_AGENT', 'options' => array('Fennec')));`
 *
 * ### Callback detectors
 *
 * Callback detectors allow you to provide a 'callback' type to handle the check.  The callback will
 * recieve the request object as its only parameter.
 *
 * e.g `addDetector('custom', array('callback' => array('SomeClass', 'somemethod')));`
 *
 * @param string $name The name of the detector.
 * @param array $options  The options for the detector definition.  See above.
 * @return void
 */
	public function addDetector($name, $options) {
		if (isset($this->_detectors[$name]) && isset($options['options'])) {
			$options = Set::merge($this->_detectors[$name], $options);
		}
		$this->_detectors[$name] = $options;
	}

/**
 * Add parameters to the request's parsed parameter set. This will overwrite any existing parameters
 *
 * @param array $params Array of parameters to merge in
 * @return The current object, you can chain this method.
 */
	public function addParams($params) {
		$this->params = array_merge($this->params, $params);
		return $this;
	}

/**
 * Add paths to the requests' paths vars.  This will overwrite any existing paths.
 *
 * @param array $paths Array of paths to merge in
 * @return the current object, you can chain this method.
 */
	public function addPaths($paths) {
		foreach (array('webroot', 'here', 'base') as $element) {
			if (isset($paths[$element])) {
				$this->{$element} = $paths[$element];
			}
		}
		return $this;
	}

/**
 * Read an HTTP header from the Request information.
 *
 * @param string $name Name of the header you want.
 * @return mixed Either false on no header being set or the value of the header.
 */
	public function header($name) {
		$name = 'HTTP_' . strtoupper(str_replace('-', '_', $name));
		if (!empty($_SERVER[$name])) {
			return $_SERVER[$name];
		}
		return false;
	}

/**
 * Get the HTTP method used for this request.
 *
 * @return string The name of the HTTP method used.
 */
	public function method() {
		return env('REQUEST_METHOD');
	}

/**
 * Get the host that the request was handled on.
 *
 * @return void
 */
	public function host() {
		return env('HTTP_HOST');
	}

/**
 * Get the domain name and include $tldLength segments of the tld.
 *
 * @param int $tldLength Number of segments your tld contains
 * @return string Domain name without subdomains.
 */
	function domain($tldLength = 1) {
		$segments = explode('.', $this->host());
		$domain = array_slice($segments, -1 * ($tldLength + 1));
		return implode('.', $domain);
	}

/**
 * Get the subdomains for a host.
 *
 * @param int $tldLength Number of segments your tld contains.
 * @return array of subdomains.
 */
	function subdomains($tldLength = 1) {
		$segments = explode('.', $this->host());
		return array_slice($segments, 0, -1 * ($tldLength + 1));
	}

/**
 * Find out which content types the client accepts or check if they accept a 
 * particular type of content.
 *
 * #### Get all types:
 *
 * `$request->accepts();`
 *
 * #### Check for a single type:
 *
 * `$request->accepts('json');`
 *
 * @param string $type The content type to check for.  Leave null to get all types a client accepts.
 * @return mixed Either an array of all the types the client accepts or a boolean if they accept the
 *   provided type.
 */
	public function accepts($type = null) {
		$acceptTypes = explode(',', $this->header('accept'));
		foreach ($acceptTypes as $i => $accepted) {
			if (strpos($accepted, ';') !== false) {
				list($accepted, $prefValue) = explode(';', $accepted);
				$acceptTypes[$i] = $accepted;
			}
		}
		if ($type === null) {
			return $acceptTypes;
		}
		return in_array($type, $acceptTypes);
	}

/**
 * Provides a read/write accessor for `$this->data`.  Allows you
 * to use a syntax similar to `CakeSession` for reading post data.
 *
 * ## Reading values.
 *
 * `$request->data('Post.title');`
 *
 * When reading values you will get `null` for keys/values that do not exist.
 *
 * ## Writing values
 *
 * `$request->data('Post.title', 'New post!');`
 *
 * You can write to any value, even paths/keys that do not exist, and the arrays
 * will be created for you.
 *
 * @param string $name Dot separated name of the value to read/write
 * @param mixed $value Value to write to the data array.
 * @return mixed Either the value being read, or this so you can chain consecutive writes.
 */
	public function data($name) {
		$args = func_get_args();
		if (count($args) == 2) {
			$this->data = Set::insert($this->data, $name, $args[1]);
			return $this;
		}
		return Set::classicExtract($this->data, $name);
	}

/**
 * Array access read implementation
 *
 * @param string $name Name of the key being accessed.
 * @return mixed
 */
	public function offsetGet($name) {
		if (isset($this->params[$name])) {
			return $this->params[$name];
		}
		if ($name == 'url') {
			return $this->query;
		}
		if ($name == 'data') {
			return $this->data;
		}
		return null;
	}

/**
 * Array access write implementation
 *
 * @param string $name Name of the key being written
 * @param mixed $value The value being written.
 * @return void
 */
	public function offsetSet($name, $value) {
		$this->params[$name] = $value;
	}

/**
 * Array access isset() implementation
 *
 * @param string $name thing to check.
 * @return boolean
 */
	public function offsetExists($name) {
		return isset($this->params[$name]);
	}

/**
 * Array access unset() implementation
 *
 * @param $name Name to unset.
 * @return void
 */
	public function offsetUnset($name) {
		unset($this->params[$name]);
	}
}