Validate HttpFoundation requests and responses against OpenAPI (3+) definitions

#OpenAPI HttpFoundation Testing

Validate HttpFoundation requests and responses against OpenAPI (3+) definitions.

See this post for more details and this repository for an example use in a Laravel project.

Note While you can safely use this package for your projects, as long as version 1.0 has not been released "minor" version patches can contain breaking changes. Make sure to check the release section before you upgrade.

#Why?

OpenAPI is a specification intended to describe RESTful APIs in a way that can be understood by both humans and machines.

By validating an API's requests and responses against the OpenAPI definition that describes it, we guarantee that the API is used correctly and behaves in accordance with the documentation we provide, thus making the OpenAPI definition the single source of truth.

The HttpFoundation component is developed and maintained as part of the Symfony framework. It is used to handle HTTP requests and responses in projects such as Symfony, Laravel, Drupal, and many others.

#How does it work?

This package is built on top of OpenAPI PSR-7 Message Validator, which validates PSR-7 messages against OpenAPI definitions.

It converts HttpFoundation request and response objects to PSR-7 messages using Symfony's PSR-7 Bridge and Tobias Nyholm's PSR-7 implementation, before passing them on to OpenAPI PSR-7 Message Validator.

#Installation

Note This package is mostly intended to be used as part of an API test suite.

Via Composer:

$ composer require --dev osteel/openapi-httpfoundation-testing

#Usage

Import the builder class:

use Osteel\OpenApi\Testing\ValidatorBuilder;

Use the builder to create a \Osteel\OpenApi\Testing\Validator object, using one of the available factory methods for YAML or JSON:

// From a file:
 
$validator = ValidatorBuilder::fromYamlFile($yamlFile)->getValidator();
$validator = ValidatorBuilder::fromJsonFile($jsonFile)->getValidator();
 
// From a string:
 
$validator = ValidatorBuilder::fromYamlString($yamlString)->getValidator();
$validator = ValidatorBuilder::fromJsonString($jsonString)->getValidator();
 
// Automatic detection (slower):
 
$validator = ValidatorBuilder::fromYaml($yamlFileOrString)->getValidator();
$validator = ValidatorBuilder::fromJson($jsonFileOrString)->getValidator();

Note You can also use a dependency injection container to bind the ValidatorBuilder class to the ValidatorBuilderInterface interface it implements and inject the interface instead, which would also be useful for testing and mocking.

You can now validate \Symfony\Component\HttpFoundation\Request and \Symfony\Component\HttpFoundation\Response objects for a given path and method:

$validator->validate($response, '/users', 'post');

Note For convenience, objects implementing \Psr\Http\Message\ServerRequestInterface or \Psr\Http\Message\ResponseInterface are also accepted.

In the example above, we check that the response matches the OpenAPI definition for a POST request on the /users path.

Each of OpenAPI's supported HTTP methods (DELETE, GET, HEAD, OPTIONS, PATCH, POST, PUT and TRACE) also has a shortcut method that calls validate under the hood, meaning the line above could also be written this way:

$validator->post($response, '/users');

Validating a request object works exactly the same way:

$validator->post($request, '/users');

In the example above, we check that the request matches the OpenAPI definition for a POST request on the /users path.

The validate method returns true in case of success, and throw a \Osteel\OpenApi\Testing\Exceptions\ValidationException exception in case of error.

#Caching

This package supports caching to speed up the parsing of OpenAPI definitions. Simply pass your PSR-6 or PSR-16 cache object to the setCache method of the ValidatorBuilder class.

Here is an example using Symfony's Array Cache Adapter:

use Osteel\OpenApi\Testing\ValidatorBuilder;
use Symfony\Component\Cache\Adapter\ArrayAdapter;
 
$cache = new ArrayAdapter();
$validator = ValidatorBuilder::fromYamlFile($yamlFile)->setCache($cache)->getValidator();

#Extending the package

There are two main extension points – message adapters and cache adapters.

#Message adapters

The ValidatorBuilder class uses the HttpFoundationAdapter class as its default HTTP message adapter. This class converts HttpFoundation request and response objects to their PSR-7 counterparts.

If you need to change the adapter's logic, or if you need a new adapter altogether, create a class implementing the MessageAdapterInterface interface and pass it to the setMessageAdapter method of the ValidatorBuilder class:

$validator = ValidatorBuilder::fromYamlFile($yamlFile)
    ->setMessageAdapter($yourAdapter)
    ->getValidator();

#Cache adapters

The ValidatorBuilder class uses the Psr16Adapter class as its default cache adapter. This class converts PSR-16 cache objects to their PSR-6 counterparts.

If you need to change the adapter's logic, or if you need a new adapter altogether, create a class implementing the CacheAdapterInterface interface and pass it to the setCacheAdapter method of the ValidatorBuilder class:

$validator = ValidatorBuilder::fromYamlFile($yamlFile)
    ->setCacheAdapter($yourAdapter)
    ->getValidator();

#Other interfaces

The ValidatorBuilder and Validator classes are final but they implement the ValidatorBuilderInterface and ValidatorInterface interfaces respectively for which you can provide your own implementations if you need to.

#Change log

Please see the Releases section for details.

#Contributing

Please see CONTRIBUTING for details.

#Credits

People

• Yannick Chenot
• Patrick Rodacker
• Johnathan Michael Dell
• Paul Mitchum
• All Contributors

Special thanks to Pavel Batanov for his advice on structuring the package.

Packages

• OpenAPI PSR-7 Message Validator
• The PSR-7 Bridge
• PSR-7 implementation

#License

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