/libraries/lithium/net/http/Router.php
PHP | 323 lines | 122 code | 21 blank | 180 comment | 24 complexity | 858de189845945d944bd9d22f16660e7 MD5 | raw file
- <?php
- /**
- * Lithium: the most rad php framework
- *
- * @copyright Copyright 2011, Union of RAD (http://union-of-rad.org)
- * @license http://opensource.org/licenses/bsd-license.php The BSD License
- */
- namespace lithium\net\http;
- use lithium\util\Inflector;
- use lithium\net\http\RoutingException;
- /**
- * The two primary responsibilities of the `Router` class are to generate URLs from parameter lists,
- * and to determine the correct set of dispatch parameters for incoming requests.
- *
- * Using `Route` objects, these two operations can be handled in a reciprocally consistent way.
- * For example, if you wanted the `/login` URL to be routed to
- * `myapp\controllers\SessionsController::add()`, you could set up a route like the following in
- * `config/routes.php`:
- *
- * {{{
- * use lithium\net\http\Router;
- *
- * Router::connect('/login', array('controller' => 'sessions', 'action' => 'add'));
- *
- * // -- or --
- *
- * Router::connect('/login', 'Sessions::add');
- * }}}
- *
- * Not only would that correctly route all requests for `/login` to `SessionsController::add()`, but
- * any time the framework generated a route with matching parameters, `Router` would return the
- * correct short URL.
- *
- * While most framework components that work with URLs (and utilize routing) handle calling the
- * `Router` directly (i.e. controllers doing redirects, or helpers generating links), if you have a
- * scenario where you need to call the `Router` directly, you can use the `match()` method.
- *
- * This allows you to keep your application's URL structure nicely decoupled from the underlying
- * software design. For more information on parsing and generating URLs, see the `parse()` and
- * `match()` methods.
- */
- class Router extends \lithium\core\StaticObject {
- /**
- * An array of loaded lithium\net\http\Route objects used to match Request objects against.
- *
- * @var array
- */
- protected static $_configurations = array();
- /**
- * Classes used by `Router`.
- *
- * @var array
- */
- protected static $_classes = array(
- 'route' => 'lithium\net\http\Route'
- );
- public static function config($config = array()) {
- if (!$config) {
- return array('classes' => static::$_classes);
- }
- if (isset($config['classes'])) {
- static::$_classes = $config['classes'] + static::$_classes;
- }
- }
- /**
- * Connects a new route and returns the current routes array. This method creates a new
- * `Route` object and registers it with the `Router`. The order in which routes are connected
- * matters, since the order of precedence is taken into account in parsing and matching
- * operations.
- *
- * @see lithium\net\http\Route
- * @see lithium\net\http\Router::parse()
- * @see lithium\net\http\Router::match()
- * @param string $template An empty string, or a route string "/"
- * @param array $params An array describing the default or required elements of the route
- * @param array $options
- * @return array Array of routes
- */
- public static function connect($template, $params = array(), $options = array()) {
- if (!is_object($template)) {
- if (is_string($params)) {
- $params = static::_parseString($params, false);
- }
- if (isset($params[0]) && is_array($tmp = static::_parseString($params[0], false))) {
- unset($params[0]);
- $params = $tmp + $params;
- }
- $params += array('action' => 'index');
- if (is_callable($options)) {
- $options = array('handler' => $options);
- }
- $class = static::$_classes['route'];
- $template = new $class(compact('template', 'params') + $options);
- }
- return (static::$_configurations[] = $template);
- }
- /**
- * Wrapper method which takes a `Request` object, parses it through all attached `Route`
- * objects, and assigns the resulting parameters to the `Request` object, and returning it.
- *
- * @param object $request A request object, usually an instance of `lithium\action\Request`.
- * @return object Returns a copy of the `Request` object with parameters applied.
- */
- public static function process($request) {
- if (!$result = static::parse($request)) {
- return $request;
- }
- return $result;
- }
- /**
- * Accepts an instance of `lithium\action\Request` (or a subclass) and matches it against each
- * route, in the order that the routes are connected.
- *
- * @see lithium\action\Request
- * @see lithium\net\http\Router::connect()
- * @param object $request A request object containing URL and environment data.
- * @return array Returns an array of parameters specifying how the given request should be
- * routed. The keys returned depend on the `Route` object that was matched, but
- * typically include `'controller'` and `'action'` keys.
- */
- public static function parse($request) {
- foreach (static::$_configurations as $route) {
- if ($match = $route->parse($request)) {
- return $match;
- }
- }
- }
- /**
- * Attempts to match an array of route parameters (i.e. `'controller'`, `'action'`, etc.)
- * against a connected `Route` object. For example, given the following route:
- *
- * {{{
- * Router::connect('/login', array('controller' => 'users', 'action' => 'login'));
- * }}}
- *
- * This will match:
- * {{{
- * $url = Router::match(array('controller' => 'users', 'action' => 'login'));
- * // returns /login
- * }}}
- *
- * For URLs templates with no insert parameters (i.e. elements like `{:id}` that are replaced
- * with a value), all parameters must match exactly as they appear in the route parameters.
- *
- * Alternatively to using a full array, you can specify routes using a more compact syntax. The
- * above example can be written as:
- *
- * {{{ $url = Router::match('Users::login'); // still returns /login }}}
- *
- * You can combine this with more complicated routes; for example:
- * {{{
- * Router::connect('/posts/{:id:\d+}', array('controller' => 'posts', 'action' => 'view'));
- * }}}
- *
- * This will match:
- * {{{
- * $url = Router::match(array('controller' => 'posts', 'action' => 'view', 'id' => '1138'));
- * // returns /posts/1138
- * }}}
- *
- * Again, you can specify the same URL with a more compact syntax, as in the following:
- * {{{
- * $url = Router::match(array('Posts::view', 'id' => '1138'));
- * // again, returns /posts/1138
- * }}}
- *
- * You can use either syntax anywhere a URL is accepted, i.e.
- * `lithium\action\Controller::redirect()`, or `lithium\template\helper\Html::link()`.
- *
- * @param string|array $url Options to match to a URL. Optionally, this can be a string
- * containing a manually generated URL.
- * @param object $context An instance of `lithium\action\Request`. This supplies the context for
- * any persistent parameters, as well as the base URL for the application.
- * @param array $options Options for the generation of the matched URL. Currently accepted
- * values are:
- * - `'absolute'` _boolean_: Indicates whether or not the returned URL should be an
- * absolute path (i.e. including scheme and host name).
- * - `'host'` _string_: If `'absolute'` is `true`, sets the host name to be used,
- * or overrides the one provided in `$context`.
- * - `'scheme'` _string_: If `'absolute'` is `true`, sets the URL scheme to be
- * used, or overrides the one provided in `$context`.
- * @return string Returns a generated URL, based on the URL template of the matched route, and
- * prefixed with the base URL of the application.
- */
- public static function match($url = array(), $context = null, array $options = array()) {
- if (is_string($url)) {
- if (strpos($url, '#') === 0 || strpos($url, 'mailto') === 0 || strpos($url, '://')) {
- return $url;
- }
- if (is_string($url = static::_parseString($url, $context))) {
- return static::_prefix($url, $context, $options);
- }
- }
- if (isset($url[0]) && is_array($params = static::_parseString($url[0], $context))) {
- unset($url[0]);
- $url = $params + $url;
- }
- $url = static::_persist($url, $context);
- $defaults = array('action' => 'index');
- $url += $defaults;
- $base = isset($context) ? $context->env('base') : '';
- $suffix = isset($url['#']) ? "#{$url['#']}" : null;
- unset($url['#']);
- foreach (static::$_configurations as $route) {
- if (!$match = $route->match($url, $context)) {
- continue;
- }
- $path = rtrim("{$base}{$match}{$suffix}", '/') ?: '/';
- $path = ($options) ? static::_prefix($path, $context, $options) : $path;
- return $path ?: '/';
- }
- $match = array("\n", 'array (', ',)', '=> NULL', '( \'', ', ');
- $replace = array('', '(', ')', '=> null', '(\'', ', ');
- $url = str_replace($match, $replace, var_export($url, true));
- throw new RoutingException("No parameter match found for URL `{$url}`.");
- }
- /**
- * Returns the prefix (scheme + hostname) for a URL based on the passed `$options` and the
- * `$context`.
- *
- * @param string $path The URL to be prefixed.
- * @param object $context The request context.
- * @param array $options Options for generating the proper prefix. Currently accepted values
- * are: `'absolute' => true|false`, `'host' => string` and `'scheme' => string`.
- * @return string The prefixed URL, depending on the passed options.
- */
- protected static function _prefix($path, $context = null, array $options = array()) {
- $defaults = array('scheme' => null, 'host' => null, 'absolute' => false);
- if ($context) {
- $defaults['host'] = $context->env('HTTP_HOST');
- $defaults['scheme'] = $context->env('HTTPS') ? 'https://' : 'http://';
- }
- $options += $defaults;
- return ($options['absolute']) ? "{$options['scheme']}{$options['host']}{$path}" : $path;
- }
- /**
- * Copies persistent parameters (parameters in the request which have been designated to
- * persist) to the current URL, unless the parameter has been explicitly disabled from
- * persisting by setting the value in the URL to `null`, or by assigning some other value.
- *
- * For example:
- *
- * {{{ embed:lithium\tests\cases\net\http\RouterTest::testParameterPersistence(1-10) }}}
- *
- * @see lithium\action\Request::$persist
- * @param array $url The parameters that define the URL to be matched.
- * @param object $context Typically an instance of `lithium\action\Request`, which contains a
- * `$persist` property, which is an array of keys to be persisted in URLs between
- * requests.
- * @return array Returns the modified URL array.
- */
- protected static function _persist($url, $context) {
- if (!$context || !isset($context->persist)) {
- return $url;
- }
- foreach ($context->persist as $key) {
- $url += array($key => $context->params[$key]);
- if ($url[$key] === null) {
- unset($url[$key]);
- }
- }
- return $url;
- }
- /**
- * Returns a route from the loaded configurations, by name.
- *
- * @param string $route Name of the route to request.
- * @return lithium\net\http\Route
- */
- public static function get($route = null) {
- if ($route === null) {
- return static::$_configurations;
- }
- return isset(static::$_configurations[$route]) ? static::$_configurations[$route] : null;
- }
- /**
- * Resets the `Router` to its default state, unloading all routes.
- *
- * @return void
- */
- public static function reset() {
- static::$_configurations = array();
- }
- /**
- * Helper function for taking a path string and parsing it into a controller and action array.
- *
- * @param string $path Path string to parse.
- * @param boolean $context
- * @return array
- */
- protected static function _parseString($path, $context) {
- if (!preg_match('/^[A-Za-z0-9_]+::[A-Za-z0-9_]+$/', $path)) {
- $base = $context ? $context->env('base') : '';
- $path = trim($path, '/');
- return $context !== false ? "{$base}/{$path}" : null;
- }
- list($controller, $action) = explode('::', $path, 2);
- $controller = Inflector::underscore($controller);
- return compact('controller', 'action');
- }
- }
- ?>