Using REST APIs [WSO2 API Manager]

In this brief article, let's take a look at how easy it is to invoke the REST APIs of WSO2 API Manager.

Anupam Gogoi

Oct. 29, 18 · Tutorial

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Introduction

The WSO2 API Manager exposes a series of REST APIs and they are quite useful if you are going to create custom tools, solutions, for example, a Maven plugin. In this article, I'm going to explain how to use the APIs and in the next series of the articles, I'm going to show how to make use of the APIs to create a Maven plugin.

Getting Started

Here is the official documentation of the REST APIs. To invoke any API, first, we need to get a pair of clientId & client secret and then use them to get the access token. Here are the necessary steps,

Get ClientID and Client Secret

Method	POST
Headers	Authorization: Base64(username:password)
Headers	Content-Type: application/json
URL	https://localhost:9443/client-registration/v0.13/register
Request	`{ "callbackUrl": "www.google.com", "clientName": "rest_api_publisher", "owner": "admin", "grantType": "password refresh_token", "saasApp": true }`
Response	`{ "clientId": "VapXbCr9XKTZJK3t_VNDtK5X2Ksa", "clientName": "admin_rest_api_publisher", "callBackURL": "www.google.lk", "clientSecret": "AA2b35yIOrqKzfxZVCxJ5OZH0Rwa", "isSaasApplication": true, "appOwner": null, "jsonString": "{\"grant_types\":\"password refresh_token\"}", "jsonAppAttribute": "{}", "tokenType": null }`

Getting Access Token

Note: Access token must be generated using the correct scope. In the below example, the scope (api_view) is used to generate access token to call an API to list available APIs. To generate access token to invoke an API to create an API, one must use api_create scope.

Method	POST
Headers	Authorization: Base64(clientId:clientSecret)
Headers	Content-Type: application/x-www-form-urlencoded
Request Params	grant_type: password
	username: admin
	password: admin
	scope : apim:api_view
Response	`{ "access_token": "f6e21049-8f0f-3c05-b337-5f34b5fd4ea0", "refresh_token": "a7d60f0b-7360-3b11-92de-e8b4ffb26ea0", "scope": "apim:api_create", "token_type": "Bearer", "expires_in": 3600 }`

Listing APIs

Once you have the access_token in hand, the following API can be called to list available APIs.

Method GET

Headers Authorization: Bearer <<ACCESS_TOKEN>>

Response

{
  "previous": "",
  "list": [
    {
      "provider": "admin",
      "version": "1.0.0",
      "description": "This sample API provides Account Status Validation",
      "name": "AccountVal",
      "context": "/account",
      "id": "2e81f147-c8a8-4f68-b4f0-69e0e7510b01",
      "status": "PUBLISHED"
    },
    {
      "provider": "admin",
      "version": "1.0.0",
      "description": null,
      "name": "api1",
      "context": "/api1",
      "id": "3e22d2fb-277a-4e9e-8c7e-1c0f7f73960e",
      "status": "PUBLISHED"
    }
  ],
  "next": "",
  "count": 2
}

Conclusion

In this brief article, I have shown how easy it is to invoke the REST APIs of WSO2 API Manager. For more detail, please go through the official documentation of WSO2. In the follow-up article, I'm going to explain how to create a Maven plugin to publish an API using the provided REST APIs.

API REST Web Protocols

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