README

A simple PSR-18 HTTP client library.

Installation

composer require nimbly/shuttle

Features

• Responses create php://temp response body stream and swap to disk when necessary.
• cURL (default) and Stream Context handlers supported.
• Middleware support out of the box.
• Easy body transformations when creating requests with JsonBody and FormBody helper classes.

Not features

• Asynchronous calls.

A note on PSR-7 and PSR-17

Shuttle makes use of PSR-7 HTTP Message and will default to using nimbly/capsule. You can override this by providing your perferred choice in PSR-7 implementations by passing PSR-17 HTTP Factories instances into the constructor of Shuttle.

$http_factory = new GuzzleHttp\Psr7\HttpFactory;

$shuttle = new Shuttle(
	requestFactory: $http_factory,
	responseFactory: $http_factory,
	streamFactory: $http_factory,
	uriFactory: $http_factory,
);

Making requests: The easy way

The quickest and easiest way to begin making requests in Shuttle is to use the HTTP method name:

use Nimbly\Shuttle\Shuttle;

$shuttle = new Shuttle;

$response = $shuttle->get("https://www.google.com");
$response = $shuttle->post("https://example.com/search", "Form data"));

Shuttle has built-in methods to support the major HTTP verbs: get, post, put, patch, delete, head, and options. However, you can make any HTTP verb request using the request method directly.

$response = $shuttle->request("connect", "https://api.example.com/v1/books");

Handling responses

Responses in Shuttle implement PSR-7 ResponseInterface and as such are streamable resources.

$response = $shuttle->get("https://api.example.com/v1/books");

echo $response->getStatusCode(); // 200
echo $response->getReasonPhrase(); // OK

$body = $response->getBody()->getContents(); // {"title": "Do Androids Dream of Electric Sheep?", "author": "Philip K. Dick"}

Handling failed requests

Shuttle will throw a RequestException by default if the request failed. This includes things like host name not found, connection timeouts, etc.

Responses with HTTP 4xx or 5xx status codes will not throw an exception and must be handled properly within your business logic.

Making requests: The PSR-7 way

If code reusability and portability is your thing, future proof your code by making requests the PSR-7 way. Remember, PSR-7 stipulates that Request and Response messages be immutable.

// Build Request message with your favorite PSR-7 library.
$request = new Request("get", "https://www.example.com");

// Send the Request.
$shuttle = new Shuttle;
$response = $shuttle->sendRequest($request);

Using the sendRequest() method does not apply any base_url or default headers passed into the Shuttle constructor. However, the request is still passed through the middleware chain.

Request bodies

An easy way to submit data with your request is to use the Nimbly\Shuttle\Body\* helper classes. These classes will automatically transform the data, convert to a BufferStream, and set a default Content-Type header on the request.

The request bodies supported are:

• JsonBody Converts an associative array or instance of JsonSerializable into JSON and sets the Content-Type header to application/json.
• FormBody Converts an associative array into a query string, sets Content-Type header to application/x-www-form-urlencoded.

To submit a JSON payload with a request:

use Nimbly\Shuttle\Body\JsonBody;

$book = [
    "title" => "Breakfast Of Champions",
    "author" => "Kurt Vonnegut",
];

$shuttle->post("https://api.example.com/v1/books", new JsonBody($book));

Middleware

Shuttle supports dual (aka double) pass middleware by implementing MiddlewareInterface. The request and response instance are both available to the middleware and can be manipulated to your specific needs.

class AuthMiddleware implements MiddlewareInterface
{
	public function __construct(
		private string $api_key)
	{
	}

	public function process(RequestInterface $request, callable $next): ResponseInterface
	{
		// Add the Authorization header with every outgoing request.
		$request = $request->withAddedHeader("Authorization", "Bearer " . $this->api_key);

		// Pass request object to next middleware layer.
		$response = $next($request);

		// Return response back with custom header added.
		return $response->withAddedHeader("X-Custom-Header", "Foo");
	}
}

You may add as many middleware layers as you need and pass them to the Shuttle constructor. The middleware are executed in the order given.

$shuttle = new Shuttle(
	middleware: [
		new AuthMiddleware(\getenv("API_KEY")),
		new FooMiddleware,
		new BazMiddleware,
	]
);