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Plugins

Introduction

RESTHeart works out-of-the-box by merely installing and configuring it.

It comes with a complete MongoDB API and a security implementation that allows to authenticate users and authorize requests according to a role-based policy.

These functionalities are actually provided by the standard plugins that are distributed with RESTHeart. If you look at the ./plugins directory you’ll find them:

plugins
├── restheart-graphql.jar
├── restheart-mongoclient-provider.jar
├── restheart-mongodb.jar
├── restheart-polyglot.jar
└── restheart-security.jar

On the other side, real applications often need the API to be extended in some way.

Plugins allow to extend RESTHeart:

  • Services extend the API adding web services.

  • Interceptors snoop and modify requests and responses at different stages of the request lifecycle.

  • Initializers execute initialization logic at system startup time.

  • Provider allow to provide objects to other plugins via the @Inject annotation.

It is also possible developing security plugins to customize the security layer. Refer to Develop Security Plugins for more information.

In short, you can develop plugins in Java, Kotlin and JavaScript and deploy them in RESTHeart. For more information on how to deploy plugins refer to How to deploy Plugins.

Important
Have a look at the plugin examples for some code examples.

Plugin Skeleton Project

To quick start a new plugin, you can clone the plugin skeleton repository.

$ git clone --depth 1 git@github.com:SoftInstigate/restheart-plugin-skeleton.git && cd restheart-plugin-skeleton
$ ./bin/rh.sh -p microd

The script ./bin/rh.sh automatically builds, deploys the plugin and restart RESTHeart to apply changes. At first run, it also automatically downloads the latest version of RESTHeart.

The project skeleton defines a dummy Service bound at /srv:

$ curl localhost:8080/srv
{"message":"Hello World!","rnd":"njXZksfKFW"}%
Important
check the repository README.md for more information.

Proxying side microservices

The proxy feature of RESTHeart is an alternative to develop custom plugins that can be used to extend the API.

Side microservices, for instance developed with a completely different technology as NodeJs, can can be proxied by RESTHeart to be served through it and protected by its security layer.

Side microservice can execute requests to RESTHeart, for instance to use its superior MongoDB API.

The user id and roles of the authenticated RESTHeart user are passed by RESTHeart to the proxied service via the X-Forwarded-Account-Id and X-Forwarded-Account-Roles request header.

As an example, the following section to the restheart.yml configuration file, proxies requests to the URI /anything to the web resource https://httpbin.org/anything

proxies:
   - location: /anything
     proxy-pass: https://httpbin.org/anything
     name: anything