Client for EasyBib API, implemented in PHP

2.4.0 2018-06-05 12:14 UTC


Use this to request data from the EasyBib API. The client uses Guzzle under the hood for the actual HTTP calls.


This library requires PHP 5.5 or later.

Use Composer to add this project to your project's dependencies.

Your Composer JSON

        "type": "vcs",
        "url": "git@github.com:easybiblabs/api-client-php.git"
"require": {
    "easybib/api-client-php": "~0.2"

Once your JSON is set, this will install the package

composer.phar install



Two OAuth grant types are currently supported: JSON Web Token, and Authorization Code.

JSON Web Token Grant

use EasyBib\Api\Client\ApiBuilder;

// $redirector is your implementation of RedirectorInterface
$apiBuilder = new ApiBuilder();

$api = $apiBuilder->createWithJsonWebTokenGrant([
    'client_id' => 'client_123',
    'client_secret' => 'secret_987',
    'subject' => 'user_id_123',

$user = $api->getUser();  // user serves as the entry point for traversing resources

$titleOfFirstProject = $user->get('projects')[0]->title;
$citationsFromFirstProject = $user->get('projects')[0]->get('citations');
$linksForSecondProject = $user->get('projects')[1]->getLinkRefs();

Authorization Code Grant

In order to use an Authorization Code Grant, you will need an implementation of RedirectorInterface from the OAuth2 Client library in order to allow the API client to redirect the user and get back an authorization code. You can find more information at an example in the README for that project.

use EasyBib\Api\Client\ApiBuilder;

$apiBuilder = new ApiBuilder();

// $redirector is your implementation of RedirectorInterface

$api = $apiBuilder->createWithAuthorizationCodeGrant([
    'client_id' => 'client_123',
    'redirect_url' => 'http://myapp.example.com/handle-token-response',

$user = $api->getUser();  // user serves as the entry point for traversing api resources

Retrieving api resources

Once you have an API object, you can use it to traverse the API. The two entry points are $api->getUser() and $api->getProjects().

getUser() will return a ApiResource representing the user; calling getResourceData()->getRelations() on the user api resource will return a set of available references which can be called from the user. So the call chain for a particular project's citations might be

$api->get('project 123')->get('citations');

which would return a Collection of citations. Some more examples:

$titleOfFirstProject = $user->get('projects')[0]->title;
$citationsFromFirstProject = $user->get('projects')[0]->get('citations');
$linksForSecondProject = $user->get('projects')[1]->getRelations();
$linksForSecondProject = $user->get('projects')[1]->listRelations();
$linksForSecondProject = $user->get('projects')[1]->hasRelation('citations');
$newProject = $user->post('projects', [
    'data' => [
        'name' => 'Some project',
        'defaultstyle' => 'mla',

Session backend

By default, the ApiBuilder uses native PHP sessions wrapped by a Symfony session interface. You can implement a different session backend; see the Symfony docs for more information.

$apiBuilder = new ApiBuilder();
$session = new Session($myCustomBackend);

Resetting the session

It is possible to reset the token store of the OAuth2 client, such as when a guest user registers or logs in, and needs a new token which will be associated with the permanent user account. In this case, the application consuming the API must instantiate a new ApiTraverser or call setCache(), with a new cache or cache namespace, to ensure that the ApiTraverser will not return api resources cached during the original session.

By default, ApiTraverser uses a PHP-array-based cache, so unless you have implemented a different caching backend, you can simply instantiate a new ApiTraverser, either directly or via the ApiBuilder.