Amazon Alexa SDK for PHP

This package provides a framework-agnostic expressive SDK for developing Alexa skills in PHP based on https://github.com/maxbeckers/amazon-alexa-php.

use Skollro\Alexa\Alexa;
use MaxBeckers\AmazonAlexa\Request\Request;

$request = Request::fromAmazonRequest(file_get_contents('php://input'), $_SERVER['HTTP_SIGNATURECERTCHAINURL'], $_SERVER['HTTP_SIGNATURE']);

Alexa::skill('amzn1.ask.skill.XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX')
    ->intent('HelloIntent', function ($request, $response) {
        $response->say('Hello');
    })
    ->handle($request, function ($response) {
        header('Content-Type: application/json');
        echo json_encode($response);
    });

Disclaimer

This package is no official Amazon Alexa SDK.

Until now this package does not support every operation which might be needed for writing Alexa skills but is a solid foundation. So feel free to PR missing features.

Install

You can install this package via composer:

composer require skollro/alexa-php-sdk

Usage

Create a skill and handle requests

Use the following code as starting point for your own skill. First you have to create a Request object from the POST request's data. Then create a new skill with Alexa::skill($applicationId), passing your application id. Finally define your request handers and call handle($request) which handles the request and creates a response.

use MaxBeckers\AmazonAlexa\Request\Request;

$request = Request::fromAmazonRequest(file_get_contents('php://input'), $_SERVER['HTTP_SIGNATURECERTCHAINURL'], $_SERVER['HTTP_SIGNATURE']);

$alexa = Alexa::skill('amzn1.ask.skill.XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX');

// define middlewares and request handlers...

$response = $alexa->handle($request);

// send response
header('Content-Type: application/json');
echo json_encode($response);

Middlewares

All requests are piped through several middlewares before the request handler is invoked. Remember to return $next($request, $response) to invoke the next middleware in the chain. If you return a $response from a middleware no other handlers are invoked and $response is returned immediately.

Automatically attached middlewares

When creating a skill with Alexa::skill($applicationId) we automatically attach the following two middlewares.

• Skollro\Alexa\VerifyRequest: Verifies if the request is coming from the Amazon Echo API and checks signatures.
• Skollro\Alexa\VerifyApplicationId: Verifies if the request is intended for your application.

Before middleware

Checking for an access token is a typical use case for a middleware which runs before the request handler.

$alexa->middleware(function ($next, $request, $response) {
    if (! $request->context->system->user->accessToken) {
        return $response->say('Link your account')->linkAccount();
    }

    return $next($request, $response);
});

After middleware

To run a middleware after the request handler, store the result of $next($request, $response) in a temporary variable and return the response later.

$alexa->middleware(function ($next, $request, $response) {
    $response = $next($request, $response);

    // modify $response here...

    return $response;
});

Request handlers

Amazon Echo API sends different types of requests to your application. Use those callbacks to implement your skill's logic. You can use invokable classes for better encapsulation.

class BarIntent
{
    public function __invoke($request, $response)
    {
        $response->say('Use an invokable class as request handler');
    }
}

$alexa->launch(function ($request, $response) {
    $response->say('Welcome to your skill');
});

$alexa->intent('HelloIntent', function ($request, $response) {
    $response->say('Hello world');
});

$alexa->intent('BarIntent', new BarIntent);

Responses

You can make use of a fluent and natural syntax for creating responses.

$alexa->intent('HelloIntent', function ($request, $response) {
     // Basic response
    $response->say('Hello world');

    // Use cards for showing information in a user's Alexa App
    $response->simple($title, $content);
    $response->standard($title, $content, $smallImageUrl, $largeImageUrl);
    $response->linkAccount();

    // Use fluent syntax
    $response->say('Link your account')->linkAccount();
});

Exceptions

If you throw an exception in a request handler we invoke this callback so you can handle exceptions there.

$alexa->exception(function ($e, $request, $response) {
    if ($e instanceof MyException) {
        return $response->say('An error occurred');
    }

    throw $e;
});

License

The MIT License (MIT). Please see License File for more information.