ac/web-services-bundle

Provides tools for developing RESTful APIs.

Monday, September 12, 2016
by americancouncils
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The README.md

ACWebServicesBundle

, _(*1)

This bundle provides generic api workflow tools for developing RESTful apis., _(*2)

NIH: A lot of the functionality in this bundle already exists in FOSRestBundle, use that if you want safety. This is periodically under heavy development., _(*3)

Features

Request lifecycle events dispatched for registered API events
Object de-serializer that leverages JMS Metadata to serialize incoming data into already existing objects
Optionally include response data as part of the outgoing response
By default handles xml, json, jsonp and yml responses
Easily convert validation errors to useful API responses
Easil serialize incoming data into existing objects

Installation

require "ac/web-services-bundle": "~0.2.0" in your composer.json
update it w/ composer: composer update ac/web-services-bundle

enable in your AppKernel.php:, _(*4)

use AC\WebServicesBundle\ACWebServicesBundle;

//...

public function getBundles()
{
    //...
    $bundles = array(
        //...
        new ACWebServicesBundle()
        //...
    );
    //....
}

Configure the bundle in your app/config/config.yml:, _(*5)

This is an example configuration block. All sections are optional and explained in more detail in subsequent sections., _(*6)

ac_web_services:
    serializer:
        allow_deserialize_into_target: true
    response_format_headers:
        yml:
            'Content-Type': 'text/x-yaml; charset=UTF-8'
        csv:
            'Content-Type': 'text/csv; charset=UTF-8'
    paths:
        '{^/api/override}':
            include_exception_data: false
            include_response_data: false
            allow_code_suppression: false
            allow_jsonp: false
            default_response_format: json
        '{^/api/}':
            include_exception_data: true
            include_response_data: true
            allow_code_suppression: true
            allow_jsonp: true
            default_response_format: json
            http_exception_map:
                'AC\WebServicesBundle\Tests\Fixtures\FixtureBundle\BundleException': { code: 403, message: 'Custom error message' }
            additional_headers:
                'x-custom-acwebservices': 'foo-bar-baz'

API Paths Configuration

Generally speaking, you configure some general behavior for your API by setting values that apply to certain routes. When a request matches a configured path, an event subscriber is registered with the relevant configuration. This subscriber fires extra api events, similar to the kernel events. From your controllers you can return raw data structures, which may include objects configured for serialization via the JMSSerializerBundle. Information returned from a controller will automatically be serialized into the requested data transfer format by the serializer service., _(*7)

For example:, _(*8)

Request to http://example.com/api/foo?_format=json
Routed to controller MyBundle\Controller\FooController::someAction

Which looks like this:, _(*9)

<?php

namespace MyBundle\Controller;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use AC\WebServicesBundle\ServiceResponse;

class FooController extends Controller
{
    public function someAction()
    {
        return new ServiceResponse(array(
            'foo' => 'bar',
            'baz' => 23
        ));
    }
}

Will return this result:, _(*10)
```
{
    "foo": "bar",
    "baz": 23
}
```

Note that changing the _format parameter to xml or yml will return the data structure in those formats as well., _(*11)

Note: If the _format parameter is absent, a default format wil be returned, which is usually json., _(*12)

Response data & code suppression

By default, API response will also include a response property that includes the HTTP response code and message. This information is also included in the actual response, but is made availabe in the response body as a matter of convenience for API consumers., _(*13)

Also, in some cases, some clients do not properly respect the actual HTTP spec. If dealing with such a client, the bundle allows you to make API requests that always return a 200 response code. If this happens, the actual HTTP code and message will still be set properly in the response body., _(*14)

The example response above, if include_response_data is true, would look like this:, _(*15)

{
    "response": {
        "code": 200,
        "message": "OK"
    },
    "foo": "bar",
    "baz": 23
}

Exceptions

On API routes that throw exceptions, they are caught and serialized with the response data described above. Note that if code suppression is turned on, the actual response code will always be 200, and the real response code must be retrieved in the returned object., _(*16)

If an HTTP exception is thrown from the controllers, the messages and codes are preserved. If another exception is thrown, however, the bundle will convert it into an HttpException with a 500 response code and default "Internal Server Error" message., _(*17)

This behavior is also configurable - you can specify a map of other exception classes, and the http code and message that should be returned instead., _(*18)

Exceptions return the response data structure described above, for example:, _(*19)

{
    "response": {
        "code": 500,
        "message": "Internal Server Error"
    }
}

Events

When handling api requests, the bundle fires a few extra events for all API requests. These are useful hooks for triggering other functionality, such as logging or metrics gathering, that should apply to all API service routes. The events fired include:, _(*20)

ac.webservice.request - When an API request is initiated, and has successfully been matched to a controller
ac.webservice.exception - If an error is encountered during an API route
ac.webservice.response - The final response from the API
ac.webservice.terminate - After the API response has been sent

You can register a listener service for any of these events with the ac.webservice.listener container tag, or register subscribers to multiple events via the ac.webservice.subscriber tag., _(*21)

ValidationException

TODO: document ValidationException, see https://github.com/AmericanCouncils/WebServicesBundle/issues/3

Serialization Extras

If serializer.allow_deserialize_into_target is configured to true, some extra services will be registered that allow serialization into pre-existing objects. Here is some example usage from a controller:, _(*22)

use AC\WebServicesBundle\Serializer\DeserializationContext;
use AC\WebServicesBundle\ServiceResponse;

//...

public function userUpdateAction(Request $req)
{
    $user = //... fetch pre-existing user however you do that
    $serializer = $this->container->get('serializer');
    $context = DeserializationContext::create()
        ->setTarget($user)
        ->setSerializeNested(true)
    ;

    //we'll assume the input is json for documentation purposes
    $modifiedUser = $serializer->deserialize($req->getContent(), get_class($user), 'json', $context);

    return ServiceResponse::create($modifiedUser);
}

The Versions

12/09 2016

dev-master

9999999-dev

Provides tools for developing RESTful APIs.

symfony-bundle web-services-bundle

Provides tools for developing RESTful APIs.