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<?php
/**
* Parses the request URL into controller, action, and parameters.
*
* PHP versions 4 and 5
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2009, Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2009, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @package cake
* @subpackage cake.cake.libs
* @since CakePHP(tm) v 0.2.9
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/

/**
* Parses the request URL into controller, action, and parameters.
*
* @package cake
* @subpackage cake.cake.libs
*/
class Router {

/**
* Array of routes connected with Router::connect()
*
* @var array
* @access public
*/
var $routes = array();

/**
* List of action prefixes used in connected routes.
* Includes admin prefix
*
* @var array
* @access private
*/
var $__prefixes = array();

/**
* Directive for Router to parse out file extensions for mapping to Content-types.
*
* @var boolean
* @access private
*/
var $__parseExtensions = false;

/**
* List of valid extensions to parse from a URL. If null, any extension is allowed.
*
* @var array
* @access private
*/
var $__validExtensions = null;

/**
* 'Constant' regular expression definitions for named route elements
*
* @var array
* @access private
*/
var $__named = array(
'Action' => 'index|show|add|create|edit|update|remove|del|delete|view|item',
'Year' => '[12][0-9]{3}',
'Month' => '0[1-9]|1[012]',
'Day' => '0[1-9]|[12][0-9]|3[01]',
'ID' => '[0-9]+',
'UUID' => '[A-Fa-f0-9]{8}-[A-Fa-f0-9]{4}-[A-Fa-f0-9]{4}-[A-Fa-f0-9]{4}-[A-Fa-f0-9]{12}'
);

/**
* Stores all information necessary to decide what named arguments are parsed under what conditions.
*
* @var string
* @access public
*/
var $named = array(
'default' => array('page', 'fields', 'order', 'limit', 'recursive', 'sort', 'direction', 'step'),
'greedy' => true,
'separator' => ':',
'rules' => false,
);

/**
* The route matching the URL of the current request
*
* @var array
* @access private
*/
var $__currentRoute = array();

/**
* Default HTTP request method => controller action map.
*
* @var array
* @access private
*/
var $__resourceMap = array(
array('action' => 'index', 'method' => 'GET', 'id' => false),
array('action' => 'view', 'method' => 'GET', 'id' => true),
array('action' => 'add', 'method' => 'POST', 'id' => false),
array('action' => 'edit', 'method' => 'PUT', 'id' => true),
array('action' => 'delete', 'method' => 'DELETE', 'id' => true),
array('action' => 'edit', 'method' => 'POST', 'id' => true)
);

/**
* List of resource-mapped controllers
*
* @var array
* @access private
*/
var $__resourceMapped = array();

/**
* Maintains the parameter stack for the current request
*
* @var array
* @access private
*/
var $__params = array();

/**
* Maintains the path stack for the current request
*
* @var array
* @access private
*/
var $__paths = array();

/**
* Keeps Router state to determine if default routes have already been connected
*
* @var boolean
* @access private
*/
var $__defaultsMapped = false;

/**
* Keeps track of whether the connection of default routes is enabled or disabled.
*
* @var boolean
* @access private
*/
var $__connectDefaults = true;

/**
* Constructor for Router.
* Builds __prefixes
*
* @return void
*/
function Router() {
$this->__setPrefixes();
}

/**
* Sets the Routing prefixes. Includes compatibilty for existing Routing.admin
* configurations.
*
* @return void
* @access private
* @todo Remove support for Routing.admin in future versions.
*/
function __setPrefixes() {
$routing = Configure::read('Routing');
if (!empty($routing['admin'])) {
$this->__prefixes[] = $routing['admin'];
}
if (!empty($routing['prefixes'])) {
$this->__prefixes = array_merge($this->__prefixes, (array)$routing['prefixes']);
}
}

/**
* Gets a reference to the Router object instance
*
* @return Router Instance of the Router.
* @access public
* @static
*/
function &getInstance() {
static $instance = array();

if (!$instance) {
$instance[0] =& new Router();
}
return $instance[0];
}

/**
* Gets the named route elements for use in app/config/routes.php
*
* @return array Named route elements
* @access public
* @see Router::$__named
* @static
*/
function getNamedExpressions() {
$self =& Router::getInstance();
return $self->__named;
}

/**
* Connects a new Route in the router.
*
* Routes are a way of connecting request urls to objects in your application. At their core routes
* are a set or regular expressions that are used to match requests to destinations.
*
* Examples:
*
* `Router::connect('/:controller/:action/*');`
*
* The first parameter will be used as a controller name while the second is used as the action name.
* the '/*' syntax makes this route greedy in that it will match requests like `/posts/index` as well as requests
* like `/posts/edit/1/foo/bar`.
*
* `Router::connect('/home-page', array('controller' => 'pages', 'action' => 'display', 'home'));`
*
* The above shows the use of route parameter defaults. And providing routing parameters for a static route.
*
* {{{
* Router::connect(
* '/:lang/:controller/:action/:id',
* array(),
* array('id' => '[0-9]+', 'lang' => '[a-z]{3}')
* );
* }}}
*
* Shows connecting a route with custom route parameters as well as providing patterns for those parameters.
* Patterns for routing parameters do not need capturing groups, as one will be added for each route params.
*
* $options offers two 'special' keys. `pass` and `persist` have special meaning in the $options array.
*
* `pass` is used to define which of the routed parameters should be shifted into the pass array. Adding a
* parameter to pass will remove it from the regular route array. Ex. `'pass' => array('slug')`
*
* `persist` is used to define which route parameters should be automatically included when generating
* new urls. You can override peristent parameters by redifining them in a url or remove them by
* setting the parameter to `false`. Ex. `'persist' => array('lang')`
*
* @param string $route A string describing the template of the route
* @param array $defaults An array describing the default route parameters. These parameters will be used by default
* and can supply routing parameters that are not dynamic. See above.
* @param array $options An array matching the named elements in the route to regular expressions which that
* element should match. Also contains additional parameters such as which routed parameters should be
* shifted into the passed arguments. As well as supplying patterns for routing parameters.
* @see routes
* @return array Array of routes
* @access public
* @static
*/
function connect($route, $defaults = array(), $options = array()) {
$self =& Router::getInstance();

foreach ($self->__prefixes as $prefix) {
if (isset($defaults[$prefix])) {
$defaults['prefix'] = $prefix;
break;
}
}
if (isset($defaults['prefix'])) {
$self->__prefixes[] = $defaults['prefix'];
$self->__prefixes = array_keys(array_flip($self->__prefixes));
}
$defaults += array('action' => 'index', 'plugin' => null);
$routeClass = 'CakeRoute';
if (isset($options['routeClass'])) {
$routeClass = $options['routeClass'];
unset($options['routeClass']);
}
//TODO 2.0 refactor this to use a string class name, throw exception, and then construct.
$Route =& new $routeClass($route, $defaults, $options);
if ($routeClass !== 'CakeRoute' && !is_subclass_of($Route, 'CakeRoute')) {
trigger_error(__('Route classes must extend CakeRoute', true), E_USER_WARNING);
return false;
}
$self->routes[] =& $Route;
return $self->routes;
}

/**
* Specifies what named parameters CakePHP should be parsing. The most common setups are:
*
* Do not parse any named parameters:
*
* {{{ Router::connectNamed(false); }}}
*
* Parse only default parameters used for CakePHP's pagination:
*
* {{{ Router::connectNamed(false, array('default' => true)); }}}
*
* Parse only the page parameter if its value is a number:
*
* {{{ Router::connectNamed(array('page' => '[\d]+'), array('default' => false, 'greedy' => false)); }}}
*
* Parse only the page parameter no mater what.
*
* {{{ Router::connectNamed(array('page'), array('default' => false, 'greedy' => false)); }}}
*
* Parse only the page parameter if the current action is 'index'.
*
* {{{
* Router::connectNamed(
* array('page' => array('action' => 'index')),
* array('default' => false, 'greedy' => false)
* );
* }}}
*
* Parse only the page parameter if the current action is 'index' and the controller is 'pages'.
*
* {{{
* Router::connectNamed(
* array('page' => array('action' => 'index', 'controller' => 'pages')),
* array('default' => false, 'greedy' => false)
* );
* }}}
*
* @param array $named A list of named parameters. Key value pairs are accepted where values are
* either regex strings to match, or arrays as seen above.
* @param array $options Allows to control all settings: separator, greedy, reset, default
* @return array
* @access public
* @static
*/
function connectNamed($named, $options = array()) {
$self =& Router::getInstance();

if (isset($options['argSeparator'])) {
$self->named['separator'] = $options['argSeparator'];
unset($options['argSeparator']);
}

if ($named === true || $named === false) {
$options = array_merge(array('default' => $named, 'reset' => true, 'greedy' => $named), $options);
$named = array();
} else {
$options = array_merge(array('default' => false, 'reset' => false, 'greedy' => true), $options);
}

if ($options['reset'] == true || $self->named['rules'] === false) {
$self->named['rules'] = array();
}

if ($options['default']) {
$named = array_merge($named, $self->named['default']);
}

foreach ($named as $key => $val) {
if (is_numeric($key)) {
$self->named['rules'][$val] = true;
} else {
$self->named['rules'][$key] = $val;
}
}
$self->named['greedy'] = $options['greedy'];
return $self->named;
}

/**
* Tell router to connect or not connect the default routes.
*
* If default routes are disabled all automatic route generation will be disabled
* and you will need to manually configure all the routes you want.
*
* @param boolean $connect Set to true or false depending on whether you want or don't want default routes.
* @return void
* @access public
* @static
*/
function defaults($connect = true) {
$self =& Router::getInstance();
$self->__connectDefaults = $connect;
}

/**
* Creates REST resource routes for the given controller(s)
*
* ### Options:
*
* - 'id' - The regular expression fragment to use when matching IDs. By default, matches
* integer values and UUIDs.
* - 'prefix' - URL prefix to use for the generated routes. Defaults to '/'.
*
* @param mixed $controller A controller name or array of controller names (i.e. "Posts" or "ListItems")
* @param array $options Options to use when generating REST routes
* @return void
* @access public
* @static
*/
function mapResources($controller, $options = array()) {
$self =& Router::getInstance();
$options = array_merge(array('prefix' => '/', 'id' => $self->__named['ID'] . '|' . $self->__named['UUID']), $options);
$prefix = $options['prefix'];

foreach ((array)$controller as $ctlName) {
$urlName = Inflector::underscore($ctlName);

foreach ($self->__resourceMap as $params) {
extract($params);
$url = $prefix . $urlName . (($id) ? '/:id' : '');

Router::connect($url,
array('controller' => $urlName, 'action' => $action, '[method]' => $params['method']),
array('id' => $options['id'], 'pass' => array('id'))
);
}
$self->__resourceMapped[] = $urlName;
}
}

/**
* Returns the list of prefixes used in connected routes
*
* @return array A list of prefixes used in connected routes
* @access public
* @static
*/
function prefixes() {
$self =& Router::getInstance();
return $self->__prefixes;
}

/**
* Parses given URL and returns an array of controller, action and parameters
* taken from that URL.
*
* @param string $url URL to be parsed
* @return array Parsed elements from URL
* @access public
* @static
*/
function parse($url) {
$self =& Router::getInstance();
if (!$self->__defaultsMapped && $self->__connectDefaults) {
$self->__connectDefaultRoutes();
}
$out = array(
'pass' => array(),
'named' => array(),
);
$r = $ext = null;

if (ini_get('magic_quotes_gpc') === '1') {
$url = stripslashes_deep($url);
}

if ($url && strpos($url, '/') !== 0) {
$url = '/' . $url;
}
if (strpos($url, '?') !== false) {
$url = substr($url, 0, strpos($url, '?'));
}
extract($self->__parseExtension($url));

for ($i = 0, $len = count($self->routes); $i < $len; $i++) {
$route =& $self->routes[$i];
if (($r = $route->parse($url)) !== false) {
$self->__currentRoute[] =& $route;

$params = $route->options;
$argOptions = array();

if (array_key_exists('named', $params)) {
$argOptions['named'] = $params['named'];
unset($params['named']);
}
if (array_key_exists('greedy', $params)) {
$argOptions['greedy'] = $params['greedy'];
unset($params['greedy']);
}
$out = $r;

if (isset($out['_args_'])) {
$argOptions['context'] = array('action' => $out['action'], 'controller' => $out['controller']);
$parsedArgs = $self->getArgs($out['_args_'], $argOptions);
$out['pass'] = array_merge($out['pass'], $parsedArgs['pass']);
$out['named'] = $parsedArgs['named'];
unset($out['_args_']);
}

if (isset($params['pass'])) {
$j = count($params['pass']);
while($j--) {
if (isset($out[$params['pass'][$j]])) {
array_unshift($out['pass'], $out[$params['pass'][$j]]);
}
}
}
break;
}
}

if (!empty($ext)) {
$out['url']['ext'] = $ext;
}
return $out;
}

/**
* Parses a file extension out of a URL, if Router::parseExtensions() is enabled.
*
* @param string $url
* @return array Returns an array containing the altered URL and the parsed extension.
* @access private
*/
function __parseExtension($url) {
$ext = null;

if ($this->__parseExtensions) {
if (preg_match('/\.[0-9a-zA-Z]*$/', $url, $match) === 1) {
$match = substr($match[0], 1);
if (empty($this->__validExtensions)) {
$url = substr($url, 0, strpos($url, '.' . $match));
$ext = $match;
} else {
foreach ($this->__validExtensions as $name) {
if (strcasecmp($name, $match) === 0) {
$url = substr($url, 0, strpos($url, '.' . $name));
$ext = $match;
break;
}
}
}
}
if (empty($ext)) {
$ext = 'html';
}
}
return compact('ext', 'url');
}

/**
* Connects the default, built-in routes, including prefix and plugin routes. The following routes are created
* in the order below:
*
* - `/:prefix/:plugin/:controller`
* - `/:prefix/:plugin/:controller/:action/*`
* - `/:prefix/:controller`
* - `/:prefix/:controller/:action/*`
* - `/:plugin/:controller`
* - `/:plugin/:controller/:action/*`
* - `/:controller'
* - `/:controller/:action/*'
*
* A prefix route is generated for each Routing.prefixes declared in core.php. You can disable the
* connection of default routes with Router::defaults().
*
* @return void
* @access private
*/
function __connectDefaultRoutes() {
if ($plugins = App::objects('plugin')) {
foreach ($plugins as $key => $value) {
$plugins[$key] = Inflector::underscore($value);
}
$match = array('plugin' => implode('|', $plugins));

foreach ($this->__prefixes as $prefix) {
$params = array('prefix' => $prefix, $prefix => true);
$indexParams = $params + array('action' => 'index');
$this->connect("/{$prefix}/:plugin/:controller", $indexParams, $match);
$this->connect("/{$prefix}/:plugin/:controller/:action/*", $params, $match);
}
$this->connect('/:plugin/:controller', array('action' => 'index'), $match);
$this->connect('/:plugin/:controller/:action/*', array(), $match);
}

foreach ($this->__prefixes as $prefix) {
$params = array('prefix' => $prefix, $prefix => true);
$indexParams = $params + array('action' => 'index');
$this->connect("/{$prefix}/:controller", $indexParams);
$this->connect("/{$prefix}/:controller/:action/*", $params);
}
$this->connect('/:controller', array('action' => 'index'));
$this->connect('/:controller/:action/*');

if ($this->named['rules'] === false) {
$this->connectNamed(true);
}
$this->__defaultsMapped = true;
}

/**
* Takes parameter and path information back from the Dispatcher, sets these
* parameters as the current request parameters that are merged with url arrays
* created later in the request.
*
* @param array $params Parameters and path information
* @return void
* @access public
* @static
*/
function setRequestInfo($params) {
$self =& Router::getInstance();
$defaults = array('plugin' => null, 'controller' => null, 'action' => null);
$params[0] = array_merge($defaults, (array)$params[0]);
$params[1] = array_merge($defaults, (array)$params[1]);
list($self->__params[], $self->__paths[]) = $params;

if (count($self->__paths)) {
if (isset($self->__paths[0]['namedArgs'])) {
foreach ($self->__paths[0]['namedArgs'] as $arg => $value) {
$self->named['rules'][$arg] = true;
}
}
}
}

/**
* Gets parameter information
*
* @param boolean $current Get current request parameter, useful when using requestAction
* @return array Parameter information
* @access public
* @static
*/
function getParams($current = false) {
$self =& Router::getInstance();
if ($current) {
return $self->__params[count($self->__params) - 1];
}
if (isset($self->__params[0])) {
return $self->__params[0];
}
return array();
}

/**
* Gets URL parameter by name
*
* @param string $name Parameter name
* @param boolean $current Current parameter, useful when using requestAction
* @return string Parameter value
* @access public
* @static
*/
function getParam($name = 'controller', $current = false) {
$params = Router::getParams($current);
if (isset($params[$name])) {
return $params[$name];
}
return null;
}

/**
* Gets path information
*
* @param boolean $current Current parameter, useful when using requestAction
* @return array
* @access public
* @static
*/
function getPaths($current = false) {
$self =& Router::getInstance();
if ($current) {
return $self->__paths[count($self->__paths) - 1];
}
if (!isset($self->__paths[0])) {
return array('base' => null);
}
return $self->__paths[0];
}

/**
* Reloads default Router settings. Resets all class variables and
* removes all connected routes.
*
* @access public
* @return void
* @static
*/
function reload() {
$self =& Router::getInstance();
foreach (get_class_vars('Router') as $key => $val) {
$self->{$key} = $val;
}
$self->__setPrefixes();
}

/**
* Promote a route (by default, the last one added) to the beginning of the list
*
* @param $which A zero-based array index representing the route to move. For example,
* if 3 routes have been added, the last route would be 2.
* @return boolean Retuns false if no route exists at the position specified by $which.
* @access public
* @static
*/
function promote($which = null) {
$self =& Router::getInstance();
if ($which === null) {
$which = count($self->routes) - 1;
}
if (!isset($self->routes[$which])) {
return false;
}
$route =& $self->routes[$which];
unset($self->routes[$which]);
array_unshift($self->routes, $route);
return true;
}

/**
* Finds URL for specified action.
*
* Returns an URL pointing to a combination of controller and action. Param
* $url can be:
*
* - Empty - the method will find address to actuall controller/action.
* - '/' - the method will find base URL of application.
* - A combination of controller/action - the method will find url for it.
*
* @param mixed $url Cake-relative URL, like "/products/edit/92" or "/presidents/elect/4"
* or an array specifying any of the following: 'controller', 'action',
* and/or 'plugin', in addition to named arguments (keyed array elements),
* and standard URL arguments (indexed array elements)
* @param mixed $full If (bool) true, the full base URL will be prepended to the result.
* If an array accepts the following keys
* - escape - used when making urls embedded in html escapes query string '&'
* - full - if true the full base URL will be prepended.
* @return string Full translated URL with base path.
* @access public
* @static
*/
function url($url = null, $full = false) {
$self =& Router::getInstance();
$defaults = $params = array('plugin' => null, 'controller' => null, 'action' => 'index');

if (is_bool($full)) {
$escape = false;
} else {
extract($full + array('escape' => false, 'full' => false));
}

if (!empty($self->__params)) {
if (isset($this) && !isset($this->params['requested'])) {
$params = $self->__params[0];
} else {
$params = end($self->__params);
}
if (isset($params['prefix']) && strpos($params['action'], $params['prefix']) === 0) {
$params['action'] = substr($params['action'], strlen($params['prefix']) + 1);
}
}
$path = array('base' => null);

if (!empty($self->__paths)) {
if (isset($this) && !isset($this->params['requested'])) {
$path = $self->__paths[0];
} else {
$path = end($self->__paths);
}
}
$base = $path['base'];
$extension = $output = $mapped = $q = $frag = null;

if (is_array($url)) {
if (isset($url['base']) && $url['base'] === false) {
$base = null;
unset($url['base']);
}
if (isset($url['full_base']) && $url['full_base'] === true) {
$full = true;
unset($url['full_base']);
}
if (isset($url['?'])) {
$q = $url['?'];
unset($url['?']);
}
if (isset($url['#'])) {
$frag = '#' . urlencode($url['#']);
unset($url['#']);
}
if (empty($url['action'])) {
if (empty($url['controller']) || $params['controller'] === $url['controller']) {
$url['action'] = $params['action'];
} else {
$url['action'] = 'index';
}
}

$prefixExists = (array_intersect_key($url, array_flip($self->__prefixes)));
foreach ($self->__prefixes as $prefix) {
if (!isset($url[$prefix]) && !empty($params[$prefix]) && !$prefixExists) {
$url[$prefix] = true;
} elseif (isset($url[$prefix]) && !$url[$prefix]) {
unset($url[$prefix]);
}
}

$url += array('controller' => $params['controller'], 'plugin' => $params['plugin']);

if (isset($url['ext'])) {
$extension = '.' . $url['ext'];
unset($url['ext']);
}
$match = false;

for ($i = 0, $len = count($self->routes); $i < $len; $i++) {
$originalUrl = $url;

if (isset($self->routes[$i]->options['persist'], $params)) {
$url = $self->routes[$i]->persistParams($url, $params);
}

if ($match = $self->routes[$i]->match($url)) {
$output = trim($match, '/');
$url = array();
break;
}
$url = $originalUrl;
}
if ($match === false) {
$output = $self->_handleNoRoute($url);
}
$output = str_replace('//', '/', $base . '/' . $output);
} else {
if (((strpos($url, '://')) || (strpos($url, 'javascript:') === 0) || (strpos($url, 'mailto:') === 0)) || (!strncmp($url, '#', 1))) {
return $url;
}
if (empty($url)) {
if (!isset($path['here'])) {
$path['here'] = '/';
}
$output = $path['here'];
} elseif (substr($url, 0, 1) === '/') {
$output = $base . $url;
} else {
$output = $base . '/';
foreach ($self->__prefixes as $prefix) {
if (isset($params[$prefix])) {
$output .= $prefix . '/';
break;
}
}
if (!empty($params['plugin']) && $params['plugin'] !== $params['controller']) {
$output .= Inflector::underscore($params['plugin']) . '/';
}
$output .= Inflector::underscore($params['controller']) . '/' . $url;
}
$output = str_replace('//', '/', $output);
}
if ($full && defined('FULL_BASE_URL')) {
$output = FULL_BASE_URL . $output;
}
if (!empty($extension) && substr($output, -1) === '/') {
$output = substr($output, 0, -1);
}

return $output . $extension . $self->queryString($q, array(), $escape) . $frag;
}

/**
* A special fallback method that handles url arrays that cannot match
* any defined routes.
*
* @param array $url A url that didn't match any routes
* @return string A generated url for the array
* @access protected
* @see Router::url()
*/
function _handleNoRoute($url) {
$named = $args = array();
$skip = array_merge(
array('bare', 'action', 'controller', 'plugin', 'prefix'),
$this->__prefixes
);

$keys = array_values(array_diff(array_keys($url), $skip));
$count = count($keys);

// Remove this once parsed URL parameters can be inserted into 'pass'
for ($i = 0; $i < $count; $i++) {
if (is_numeric($keys[$i])) {
$args[] = $url[$keys[$i]];
} else {
$named[$keys[$i]] = $url[$keys[$i]];
}
}

list($args, $named) = array(Set::filter($args, true), Set::filter($named, true));
foreach ($this->__prefixes as $prefix) {
if (!empty($url[$prefix])) {
$url['action'] = str_replace($prefix . '_', '', $url['action']);
break;
}
}

if (empty($named) && empty($args) && (!isset($url['action']) || $url['action'] === 'index')) {
$url['action'] = null;
}

$urlOut = array_filter(array($url['controller'], $url['action']));

if (isset($url['plugin']) && $url['plugin'] != $url['controller']) {
array_unshift($urlOut, $url['plugin']);
}

foreach ($this->__prefixes as $prefix) {
if (isset($url[$prefix])) {
array_unshift($urlOut, $prefix);
break;
}
}
$output = implode('/', $urlOut);

if (!empty($args)) {
$output .= '/' . implode('/', $args);
}

if (!empty($named)) {
foreach ($named as $name => $value) {
$output .= '/' . $name . $this->named['separator'] . $value;
}
}
return $output;
}

/**
* Takes an array of URL parameters and separates the ones that can be used as named arguments
*
* @param array $params Associative array of URL parameters.
* @param string $controller Name of controller being routed. Used in scoping.
* @param string $action Name of action being routed. Used in scoping.
* @return array
* @access public
* @static
*/
function getNamedElements($params, $controller = null, $action = null) {
$self =& Router::getInstance();
$named = array();

foreach ($params as $param => $val) {
if (isset($self->named['rules'][$param])) {
$rule = $self->named['rules'][$param];
if (Router::matchNamed($param, $val, $rule, compact('controller', 'action'))) {
$named[$param] = $val;
unset($params[$param]);
}
}
}
return array($named, $params);
}

/**
* Return true if a given named $param's $val matches a given $rule depending on $context. Currently implemented
* rule types are controller, action and match that can be combined with each other.
*
* @param string $param The name of the named parameter
* @param string $val The value of the named parameter
* @param array $rule The rule(s) to apply, can also be a match string
* @param string $context An array with additional context information (controller / action)
* @return boolean
* @access public
* @static
*/
function matchNamed($param, $val, $rule, $context = array()) {
if ($rule === true || $rule === false) {
return $rule;
}
if (is_string($rule)) {
$rule = array('match' => $rule);
}
if (!is_array($rule)) {
return false;
}

$controllerMatches = !isset($rule['controller'], $context['controller']) || in_array($context['controller'], (array)$rule['controller']);
if (!$controllerMatches) {
return false;
}
$actionMatches = !isset($rule['action'], $context['action']) || in_array($context['action'], (array)$rule['action']);
if (!$actionMatches) {
return false;
}
return (!isset($rule['match']) || preg_match('/' . $rule['match'] . '/', $val));
}

/**
* Generates a well-formed querystring from $q
*
* @param mixed $q Query string
* @param array $extra Extra querystring parameters.
* @param bool $escape Whether or not to use escaped &
* @return array
* @access public
* @static
*/
function queryString($q, $extra = array(), $escape = false) {
if (empty($q) && empty($extra)) {
return null;
}
$join = '&';
if ($escape === true) {
$join = '&amp;';
}
$out = '';

if (is_array($q)) {
$q = array_merge($extra, $q);
} else {
$out = $q;
$q = $extra;
}
$out .= http_build_query($q, null, $join);
if (isset($out[0]) && $out[0] != '?') {
$out = '?' . $out;
}
return $out;
}

/**
* Reverses a parsed parameter array into a string. Works similarily to Router::url(), but
* Since parsed URL's contain additional 'pass' and 'named' as well as 'url.url' keys.
* Those keys need to be specially handled in order to reverse a params array into a string url.
*
* @param array $param The params array that needs to be reversed.
* @return string The string that is the reversed result of the array
* @access public
* @static
*/
function reverse($params) {
$pass = $params['pass'];
$named = $params['named'];
$url = $params['url'];
unset($params['pass'], $params['named'], $params['paging'], $params['models'], $params['url'], $url['url']);
$params = array_merge($params, $pass, $named);
if (!empty($url)) {
$params['?'] = $url;
}
return Router::url($params);
}

/**
* Normalizes a URL for purposes of comparison
*
* @param mixed $url URL to normalize
* @return string Normalized URL
* @access public
* @static
*/
function normalize($url = '/') {
if (is_array($url)) {
$url = Router::url($url);
} elseif (preg_match('/^[a-z\-]+:\/\//', $url)) {
return $url;
}
$paths = Router::getPaths();

if (!empty($paths['base']) && stristr($url, $paths['base'])) {
$url = preg_replace('/^' . preg_quote($paths['base'], '/') . '/', '', $url, 1);
}
$url = '/' . $url;

while (strpos($url, '//') !== false) {
$url = str_replace('//', '/', $url);
}
$url = preg_replace('/(?:(\/$))/', '', $url);

if (empty($url)) {
return '/';
}
return $url;
}

/**
* Returns the route matching the current request URL.
*
* @return CakeRoute Matching route object.
* @access public
* @static
*/
function &requestRoute() {
$self =& Router::getInstance();
return $self->__currentRoute[0];
}

/**
* Returns the route matching the current request (useful for requestAction traces)
*
* @return CakeRoute Matching route object.
* @access public
* @static
*/
function &currentRoute() {
$self =& Router::getInstance();
return $self->__currentRoute[count($self->__currentRoute) - 1];
}

/**
* Removes the plugin name from the base URL.
*
* @param string $base Base URL
* @param string $plugin Plugin name
* @return base url with plugin name removed if present
* @access public
* @static
*/
function stripPlugin($base, $plugin = null) {
if ($plugin != null) {
$base = preg_replace('/(?:' . $plugin . ')/', '', $base);
$base = str_replace('//', '', $base);
$pos1 = strrpos($base, '/');
$char = strlen($base) - 1;

if ($pos1 === $char) {
$base = substr($base, 0, $char);
}
}
return $base;
}

/**
* Instructs the router to parse out file extensions from the URL. For example,
* http://example.com/posts.rss would yield an file extension of "rss".
* The file extension itself is made available in the controller as
* $this->params['url']['ext'], and is used by the RequestHandler component to
* automatically switch to alternate layouts and templates, and load helpers
* corresponding to the given content, i.e. RssHelper.
*
* A list of valid extension can be passed to this method, i.e. Router::parseExtensions('rss', 'xml');
* If no parameters are given, anything after the first . (dot) after the last / in the URL will be
* parsed, excluding querystring parameters (i.e. ?q=...).
*
* @access public
* @return void
* @static
*/
function parseExtensions() {
$self =& Router::getInstance();
$self->__parseExtensions = true;
if (func_num_args() > 0) {
$self->__validExtensions = func_get_args();
}
}

/**
* Takes an passed params and converts it to args
*
* @param array $params
* @return array Array containing passed and named parameters
* @access public
* @static
*/
function getArgs($args, $options = array()) {
$self =& Router::getInstance();
$pass = $named = array();
$args = explode('/', $args);

$greedy = isset($options['greedy']) ? $options['greedy'] : $self->named['greedy'];
$context = array();
if (isset($options['context'])) {
$context = $options['context'];
}
$rules = $self->named['rules'];
if (isset($options['named'])) {
$greedy = isset($options['greedy']) && $options['greedy'] === true;
foreach ((array)$options['named'] as $key => $val) {
if (is_numeric($key)) {
$rules[$val] = true;
continue;
}
$rules[$key] = $val;
}
}

foreach ($args as $param) {
if (empty($param) && $param !== '0' && $param !== 0) {
continue;
}

$separatorIsPresent = strpos($param, $self->named['separator']) !== false;
if ((!isset($options['named']) || !empty($options['named'])) && $separatorIsPresent) {
list($key, $val) = explode($self->named['separator'], $param, 2);
$hasRule = isset($rules[$key]);
$passIt = (!$hasRule && !$greedy) || ($hasRule && !$self->matchNamed($key, $val, $rules[$key], $context));
if ($passIt) {
$pass[] = $param;
} else {
$named[$key] = $val;
}
} else {
$pass[] = $param;
}
}
return compact('pass', 'named');
}
}

/**
* A single Route used by the Router to connect requests to
* parameter maps.
*
* Not normally created as a standalone. Use Router::connect() to create
* Routes for your application.
*
* @package cake.libs
* @since 1.3.0
* @see Router::connect()
*/
class CakeRoute {

/**
* An array of named segments in a Route.
* `/:controller/:action/:id` has 3 key elements
*
* @var array
* @access public
*/
var $keys = array();

/**
* An array of additional parameters for the Route.
*
* @var array
* @access public
*/
var $options = array();

/**
* Default parameters for a Route
*
* @var array
* @access public
*/
var $defaults = array();

/**
* The routes template string.
*
* @var string
* @access public
*/
var $template = null;

/**
* Is this route a greedy route? Greedy routes have a `/*` in their
* template
*
* @var string
* @access protected
*/
var $_greedy = false;

/**
* The compiled route regular expresssion
*
* @var string
* @access protected
*/
var $_compiledRoute = null;

/**
* HTTP header shortcut map. Used for evaluating header-based route expressions.
*
* @var array
* @access private
*/
var $__headerMap = array(
'type' => 'content_type',
'method' => 'request_method',
'server' => 'server_name'
);

/**
* Constructor for a Route
*
* @param string $template Template string with parameter placeholders
* @param array $defaults Array of defaults for the route.
* @param string $params Array of parameters and additional options for the Route
* @return void
* @access public
*/
function CakeRoute($template, $defaults = array(), $options = array()) {
$this->template = $template;
$this->defaults = (array)$defaults;
$this->options = (array)$options;
}

/**
* Check if a Route has been compiled into a regular expression.
*
* @return boolean
* @access public
*/
function compiled() {
return !empty($this->_compiledRoute);
}

/**
* Compiles the route's regular expression. Modifies defaults property so all necessary keys are set
* and populates $this->names with the named routing elements.
*
* @return array Returns a string regular expression of the compiled route.
* @access public
*/
function compile() {
if ($this->compiled()) {
return $this->_compiledRoute;
}
$this->_writeRoute();
return $this->_compiledRoute;
}

/**
* Builds a route regular expression. Uses the template, defaults and options
* properties to compile a regular expression that can be used to parse request strings.
*
* @return void
* @access protected
*/
function _writeRoute() {
if (empty($this->template) || ($this->template === '/')) {
$this->_compiledRoute = '#^/*$#';
$this->keys = array();
return;
}
$route = $this->template;
$names = $replacements = $search = array();
$parsed = preg_quote($this->template, '#');

preg_match_all('#:([A-Za-z0-9_-]+[A-Z0-9a-z])#', $route, $namedElements);
foreach ($namedElements[1] as $i => $name) {
if (isset($this->options[$name])) {
$option = null;
if ($name !== 'plugin' && array_key_exists($name, $this->defaults)) {
$option = '?';
}
$slashParam = '/\\' . $namedElements[0][$i];
if (strpos($parsed, $slashParam) !== false) {
$replacements[] = '(?:/(?P<' . $name . '>' . $this->options[$name] . ')' . $option . ')' . $option;
$search[] = $slashParam;
} else {
$search[] = '\\' . $namedElements[0][$i];
$replacements[] = '(?:(?P<' . $name . '>' . $this->options[$name] . ')' . $option . ')' . $option;
}
} else {
$replacements[] = '(?:(?P<' . $name . '>[^/]+))';
$search[] = '\\' . $namedElements[0][$i];
}
$names[] = $name;
}
if (preg_match('#\/\*$#', $route, $m)) {
$parsed = preg_replace('#/\\\\\*$#', '(?:/(?P<_args_>.*))?', $parsed);
$this->_greedy = true;
}
$parsed = str_replace($search, $replacements, $parsed);
$this->_compiledRoute = '#^' . $parsed . '[/]*$#';
$this->keys = $names;
}

/**
* Checks to see if the given URL can be parsed by this route.
* If the route can be parsed an array of parameters will be returned if not
* false will be returned. String urls are parsed if they match a routes regular expression.
*
* @param string $url The url to attempt to parse.
* @return mixed Boolean false on failure, otherwise an array or parameters
* @access public
*/
function parse($url) {
if (!$this->compiled()) {
$this->compile();
}
if (!preg_match($this->_compiledRoute, $url, $route)) {
return false;
} else {
foreach ($this->defaults as $key => $val) {
if ($key[0] === '[' && preg_match('/^\[(\w+)\]$/', $key, $header)) {
if (isset($this->__headerMap[$header[1]])) {
$header = $this->__headerMap[$header[1]];
} else {
$header = 'http_' . $header[1];
}

$val = (array)$val;
$h = false;

foreach ($val as $v) {
if (env(strtoupper($header)) === $v) {
$h = true;
}
}
if (!$h) {
return false;
}
}
}
array_shift($route);
$count = count($this->keys);
for ($i = 0; $i <= $count; $i++) {
unset($route[$i]);
}
$route['pass'] = $route['named'] = array();
$route += $this->defaults;

foreach ($route as $key => $value) {
if (is_integer($key)) {
$route['pass'][] = $value;
unset($route[$key]);
}
}
return $route;
}
}

/**
* Apply persistent parameters to a url array. Persistant parameters are a special
* key used during route creation to force route parameters to persist when omitted from
* a url array.
*
* @param array $url The array to apply persistent parameters to.
* @param array $params An array of persistent values to replace persistent ones.
* @return array An array with persistent parameters applied.
* @access public
*/
function persistParams($url, $params) {
foreach ($this->options['persist'] as $persistKey) {
if (array_key_exists($persistKey, $params) && !isset($url[$persistKey])) {
$url[$persistKey] = $params[$persistKey];
}
}
return $url;
}

/**
* Attempt to match a url array. If the url matches the route parameters + settings, then
* return a generated string url. If the url doesn't match the route parameters false will be returned.
* This method handles the reverse routing or conversion of url arrays into string urls.
*
* @param array $url An array of parameters to check matching with.
* @return mixed Either a string url for the parameters if they match or false.
* @access public
*/
function match($url) {
if (!$this->compiled()) {
$this->compile();
}
$defaults = $this->defaults;

if (isset($defaults['prefix'])) {
$url['prefix'] = $defaults['prefix'];
}

//check that all the key names are in the url
$keyNames = array_flip($this->keys);
if (array_intersect_key($keyNames, $url) != $keyNames) {
return false;
}

$diffUnfiltered = Set::diff($url, $defaults);
$diff = array();

foreach ($diffUnfiltered as $key => $var) {
if ($var === 0 || $var === '0' || !empty($var)) {
$diff[$key] = $var;
}
}

//if a not a greedy route, no extra params are allowed.
if (!$this->_greedy && array_diff_key($diff, $keyNames) != array()) {
return false;
}

//remove defaults that are also keys. They can cause match failures
foreach ($this->keys as $key) {
unset($defaults[$key]);
}
$filteredDefaults = array_filter($defaults);

//if the difference between the url diff and defaults contains keys from defaults its not a match
if (array_intersect_key($filteredDefaults, $diffUnfiltered) !== array()) {
return false;
}

$passedArgsAndParams = array_diff_key($diff, $filteredDefaults, $keyNames);
list($named, $params) = Router::getNamedElements($passedArgsAndParams, $url['controller'], $url['action']);

//remove any pass params, they have numeric indexes, skip any params that are in the defaults
$pass = array();
$i = 0;
while (isset($url[$i])) {
if (!isset($diff[$i])) {
$i++;
continue;
}
$pass[] = $url[$i];
unset($url[$i], $params[$i]);
$i++;
}

//still some left over parameters that weren't named or passed args, bail.
if (!empty($params)) {
return false;
}

//check patterns for routed params
if (!empty($this->options)) {
foreach ($this->options as $key => $pattern) {
if (array_key_exists($key, $url) && !preg_match('#^' . $pattern . '$#', $url[$key])) {
return false;
}
}
}
return $this->_writeUrl(array_merge($url, compact('pass', 'named')));
}

/**
* Converts a matching route array into a url string. Composes the string url using the template
* used to create the route.
*
* @param array $params The params to convert to a string url.
* @return string Composed route string.
* @access protected
*/
function _writeUrl($params) {
if (isset($params['plugin'], $params['controller']) && $params['plugin'] === $params['controller']) {
unset($params['controller']);
}

if (isset($params['prefix'], $params['action'])) {
$params['action'] = str_replace($params['prefix'] . '_', '', $params['action']);
unset($params['prefix']);
}

if (is_array($params['pass'])) {
$params['pass'] = implode('/', $params['pass']);
}

$instance =& Router::getInstance();
$separator = $instance->named['separator'];

if (!empty($params['named'])) {
if (is_array($params['named'])) {
$named = array();
foreach ($params['named'] as $key => $value) {
$named[] = $key . $separator . $value;
}
$params['pass'] = $params['pass'] . '/' . implode('/', $named);;
}
}
$out = $this->template;

$search = $replace = array();
foreach ($this->keys as $key) {
$string = null;
if (isset($params[$key])) {
$string = $params[$key];
} elseif (strpos($out, $key) != strlen($out) - strlen($key)) {
$key = $key . '/';
}
$search[] = ':' . $key;
$replace[] = $string;
}
$out = str_replace($search, $replace, $out);

if (strpos($this->template, '*')) {
$out = str_replace('*', $params['pass'], $out);
}
$out = str_replace('//', '/', $out);
return $out;
}
}
?>
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