HTTP HMAC Signer for PHP

HMAC Request Signer is a PHP library that implements the version 2.0 of the HTTP HMAC Spec to sign and verify RESTful Web API requests. It integrates with popular libraries such as Symfony and Guzzle and can be used on both the server and client.

Installation

HMAC Request Signer can be installed with Composer by adding it as a dependency to your project's composer.json file.

{
    "require": {
        "acquia/http-hmac-php": "~3.1.0"
    }
}

Please refer to Composer's documentation for more detailed installation and usage instructions.

Usage

Sign an API request sent via Guzzle

use Acquia\Hmac\Guzzle\HmacAuthMiddleware;
use Acquia\Hmac\Key;
use GuzzleHttp\Client;
use GuzzleHttp\HandlerStack;

// Optionally, you can provide signed headers to generate the digest. The header keys need to be provided to the middleware below.
$options = [
  'headers' => [
    'X-Custom-1' => 'value1',
    'X-Custom-2' => 'value2',
  ],
];

// A key consists of your UUID and a MIME base64 encoded shared secret.
$key = new Key('e7fe97fa-a0c8-4a42-ab8e-2c26d52df059', base64_encode('secret'));

// Provide your key, realm and optional signed headers.
$middleware = new HmacAuthMiddleware($key, 'CIStore', array_keys($options['headers']));

// Register the middleware.
$stack = HandlerStack::create();
$stack->push($middleware);

// Create a client.
$client = new Client([
    'handler' => $stack,
]);

// Request.
$result = $client->get('https://service.acquia.io/api/v1/widget', $options);
var_dump($result);

Authenticate the request using PSR-7-compatible requests

use Acquia\Hmac\RequestAuthenticator;
use Acquia\Hmac\ResponseSigner;

// $keyLoader implements \Acquia\Hmac\KeyLoaderInterface
$authenticator = new RequestAuthenticator($keyLoader);

// $request implements PSR-7's \Psr\Http\Message\RequestInterface
// An exception will be thrown if it cannot authenticate.
$key = $authenticator->authenticate($request);

$signer = new ResponseSigner($key, $request)
$signedResponse = $signer->signResponse($response);

Authenticate using Silex's SecurityServiceProvider

In order to use the provided Silex security provider, you will need to include the following optional libraries in your project's composer.json:

{
    "require": {
        "symfony/psr-http-message-bridge": "~0.1",
        "symfony/security": "~3.0",
        "zendframework/zend-diactoros": "~1.3.5"
    }
}

Sample implementation:

use Acquia\Hmac\HmacSecurityProvider;
use Silex\Application;
use Silex\Provider\SecurityServiceProvider;

$app = new Application();

// $keyLoader implements \Acquia\Hmac\KeyLoaderInterface
$app->register(new SecurityServiceProvider());
$app->register(new HmacSecurityProvider($keyLoader));

$app['security.firewalls'] = [
    'hmac-auth' => array(
        'pattern' => '^/api/',
        'hmac' => true,
    ),
];

$app->boot();

Authenticate using Symfony's Security component

In order to use the provided Symfony integration, you will need to include the following optional libraries in your project's composer.json

{
    "require": {
        "symfony/psr-http-message-bridge": "~0.1",
        "symfony/security": "~3.0",
        "zendframework/zend-diactoros": "~1.3.5"
    }
}

Sammple implementation:

# app/config/parameters.yml
parameters:
   hmac_keys: {"key": "secret"}

# app/config/services.yml
services:
    hmac.keyloader:
        class: Acquia\Hmac\KeyLoader
        arguments:
            $keys: '%hmac_keys%'

    hmac.request.authenticator:
        class: Acquia\Hmac\RequestAuthenticator
        arguments:
         - '@hmac.keyloader'
        public: false

    hmac.entry-point:
        class: Acquia\Hmac\Symfony\HmacAuthenticationEntryPoint

    hmac.security.authentication.provider:
        class: Acquia\Hmac\Symfony\HmacAuthenticationProvider
        arguments:
            - '@hmac.request.authenticator'
        public: false

    hmac.security.authentication.listener:
        class: Acquia\Hmac\Symfony\HmacAuthenticationListener
        arguments: ['@security.token_storage', '@security.authentication.manager', '@hmac.entry-point']
        public: false

# app/config/security.yml
security:
    # ...

    firewalls:
        hmac_auth:
            pattern:   ^/api/
            stateless: true
            wsse:      true

// src/AppBundle/AppBundle.php
namespace AppBundle;

use Acquia\Hmac\Symfony\HmacFactory;
use Symfony\Component\HttpKernel\Bundle\Bundle;
use Symfony\Component\DependencyInjection\ContainerBuilder;

class AppBundle extends Bundle
{
    public function build(ContainerBuilder $container)
    {
        parent::build($container);
        $extension = $container->getExtension('security');
        $extension->addSecurityListenerFactory(new HmacFactory());
    }
}

Contributing and Development

Submit changes using GitHub's standard pull request workflow.

All code should adhere to the following standards:

• PSR-1
• PSR-2
• PSR-4
• PSR-7

Use PHP_CodeSniffer to validate coding style and automatically fix problems according to the PSR-2 standard:

$ vendor/bin/phpcs --standard=PSR2 --runtime-set ignore_warnings_on_exit true --colors src/.
$ vendor/bin/phpcs --standard=PSR2 --runtime-set ignore_warnings_on_exit true --colors test/.
$ vendor/bin/phpcbf --standard=PSR2 src/.
$ vendor/bin/phpcbf --standard=PSR2 test/.

Refer to PHP Project Starter's documentation for the Apache Ant targets supported by this project.