Objectiveweb URL Router 
Lightweight url router with dependency injection support., (*1)
Instalation
Add the dependency to composer.json, then composer install, (*2)
{
"require": {
"objectiveweb/router": "~2.0"
}
}
Basic Usage
In Objectiveweb applications, an endpoint refers to a php file which responds to url routes., (*3)
Under the hood, the route($regex, $callable) function tests $regex against the current
request method and uri (e.g. "GET endpoint.php/something/([0-9]+)/?"), passing the captured
parameters to $callable when matched., (*4)
Example endpoint
<?php
// include the composer autoloader
require_once('../vendor/autoload.php')
use Objectiveweb\Router;
$app = new Router();
// Routes are matched in order
$app->GET('/?', function() {
echo "Hello index';
});
$app->GET('/([a-z]+)/?', function($key) {
switch($key) {
case 'data':
// If the callback returns something, it's sent with status 200 (OK)
// Arrays are automatically encoded to json
return [ 1, 2, 3 ];
break;
default:
throw new \Exception([ 'key' => $key, 'empty' => true ], 404); // respond with custom code
break;
}
});
$app->POST('/panic', function() {
// Exceptions are captured, message is send with the proper code
throw new \Exception('Panic!', 500);
});
// catch all
$app->router("([A_Z]+) (.*), function ($method, $path) {
return "Request matched $method and $path";
});
- GET http://server/endpoint.php displays
Hello index
- GET http://server/endpoint.php/data returns a json-encoded array with values 1, 2, 3
- GET http://server/endpoint.php/test returns a not found error with a json object on its body
- POST http://server/endpoint.php/panic raises a 500 Internal server error with 'Panic!' as the response
Controllers
PHP classes may be bound to an url using the controller($path, $class) on public-facing endpoint (index.php), (*5)
$app->controller('/', 'ExampleController');
In this case, the request is mapped to the corresponding class method as follows, (*6)
<?php
class ExampleController {
// GET /?k=v
function index($querystring) {
}
// GET /(.*)?k=v
function get($path1, $path2, ..., $querystring) {
}
// Runs before all actions
function before() {
}
// Runs before post();
function beforePost($body) {
}
// POST /
function post($body) {
}
// Other request methods are also valid, i.e. head(), options(), beforeHead(), etc
}
When a function named like the first parameter ($path[0]) exists on the controller, it gets called with the
remaining parameters, (*7)
// (GET|POST|PUT|...) /example/(.*)
function example($path[1], $path[2], ...) {
// check $_SERVER['REQUEST_METHOD'] and process data
}
This function name may also be prefixed with the request method. In this case the query parameters are passed as the
last argument, (*8)
// GET /example/(.*)
function getExample($path[1], $path[2], ..., $_GET) {
}
// POST /example/(.*)
function postExample($path[1], $path[2], ..., $decoded_post_body) {
}
Other request methods are also valid (i.e. HEAD, OPTIONS, etc), check the example subdir for other uses., (*9)
Automatic routing
You can bootstrap the application on a particular namespace using, (*10)
$app->run('Namespace');
When run, the Router automatically maps the incoming requests to the given namespace. For example, a request to
/products would instantiate the Namespace\ProductsController class., (*11)
If the Controller doesn't exist, the request is passed to the Namespace\HomeController. Check example/app-run.php
for a working demo., (*12)
Dependency Injection
Since version 2.0, the Router extends Dice, which provides a dependency injection
container to the application., (*13)
<?php
// include the composer autoloader
require_once('../vendor/autoload.php')
use Objectiveweb\Router;
$app = new Router();
// Configure the DI container rules for the PDO class
$app->addRule('PDO', [
'shared' => true,
'constructParams' => ['mysql:host=127.0.0.1;dbname=mydb', 'username', 'password']
]);
// From now on, you can get a configured PDO instance using
$pdo = $app->create('PDO');
When bound to paths, Controller (And dependencies of those dependencies) get automatically resolved.
For example, if you define the controller, (*14)
<?php
namespace MyApplication;
class MyController {
private $pdo;
function __construct(PDO $pdo) {
$this->pdo = pdo;
}
function index() {
// query the database using $this->pdo
}
}
When MyApplication\MyController gets instantiated by the Router, a configured instance of PDO will
be injected and reused as necessary., (*15)
You can inject dependencies adding type-hinted parameters to your controller's constructor:, (*16)
function __construct(\Util\Gmaps $gmaps, \DB\ProductsRepository $products) {
$this->gmaps = $gmaps;
$this->products = $products;
}
// Use $this->gmaps and $this->products on other functions
In a another example, let's instantiate Twig, (*17)
// index.php
$app = new \Objectiveweb\Router();
$app->addRule('Twig_Loader_Filesystem', array(
'shared' => true,
'constructParams' => [ TEMPLATE_ROOT ]
));
$app->addRule('Twig_Environment', array(
'shared' => true,
'constructParams' => [
[ 'instance' => 'Twig_Loader_Filesystem' ],
[ 'cache' => APP_ROOT.'/cache' ],
[ 'auto_reload' => true ]
],
'call' => [
[ 'addGlobal', [ 'server', $_SERVER['SERVER_NAME'] ] ],
[ 'addGlobal', [ 'app_name', APP_NAME ] ],
[ 'addGlobal', [ 'session', $_SESSION ] ],
[ 'addFunction', [ new Twig_SimpleFunction('url', function ($path) {
return \Objectiveweb\Router::url($path);
})]]
]
));
$app->controller('/', 'MyController')
Then, inject it on your controller's constructor, (*18)
class MyController {
private $twig;
private $pdo;
function __construct(Twig_Environment $twig, PDO $pdo) {
$this->twig = $twig;
$this->pdo = $pdo;
}
function index() {
return $this->twig->render(...);
}
}
You can also fetch the twig reference using, (*19)
$twig = $app->create('Twig_Environment');
Rules
Dice Rules can be configured with these properties:, (*20)
- shared (boolean) - Whether a single instance is used throughout the container.
View Example
- inherit (boolean) - Whether the rule will also apply to subclasses (defaults to true).
View Example
- constructParams (array) - Additional parameters passed to the constructor.
View Example
- substitutions (array) - key->value substitutions for dependencies.
View Example
- call (multidimensional array) - A list of methods and their arguments which will be
called after the object has been constructed. View Example
- instanceOf (string) - The name of the class to initiate. Used when the class name is not passed
to
$app->addRule(). View Example
- shareInstances (array) - A list of class names that will be shared throughout a single object
tree. View Example
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