REST API Authentication On Atlassian using Gitlab as OAuth Provider

Using this app, you can authenticate the Application APIs using any third party OAuth/OIDC provider or API Tokens. The app supports Azure AD, Keycloak, Okta, AWS Cognito, Google, Github, Slack, Gitlab, Facebook and any custom provider.

Atlassian provides REST APIs to perform a number of operations such as Create Page, Delete Page, Add Comment, Create Space, etc. However, it supports only two authentication methods for REST APIs:
  1. Basic Authentication
  2. Using OAuth 1.0
The REST API Authentication plugin allows you to use any third party OAuth 2.0 provider/ OpenID connect to authenticate REST APIs. Here we will go through a guide to configure Azure AD as Provider.

Download And Installation

  • Log into your atlassian instance as admin.
  • Navigate to the settings menu and Click Manage Apps.
  • Click Find new apps or Find new add-ons from the left-hand side of the page.
  • Locate API Token/OAuth Authentication app.
  • Click Try free to begin a new trial or Buy now to purchase a license.
  • Enter your information and click Generate license when redirected to MyAtlassian.
  • Click Apply license.

Step 1: Configure Gitlab server:

  • Sign in to Gitlab and login to your account.
  • Navigate to your profile settings.
 Rest API OAuth, API token, API Key authentication for Jira and Confluence Gitlab Registration
  • Select applications in left menu.
 Rest API OAuth, API token, API Key authentication for Jira and Confluence Gitlab application
  • Enter the Name for your application and enter the redirect URL (Enter Application's Base URL) and click on save .
 Rest API OAuth, API token, API Key authentication for Jira and Confluence Gitlab
  • The check-box for “api” needs to be checked, as it’s unchecked by default.
  • Get Client ID & Client Secret : Copy Application Id , Secret and Scope.
 Rest API OAuth, API token, API Key authentication for Jira and Confluence

Step 2: Fetch Access token through POSTMAN:

  • Open the Postman Application (Here is the link to download Postman Application).
  • Go to Authorization tab.
  • From the dropdown select type as OAuth 2.0 and  click on Get access token.
  • Add the following information from the table below.
  • Postman starts the authentication flow and prompts you to use the access token.
  • Select Add token to the header.
Field Value
Grant type Authorization Code or Client Credentials
Callback URL Enter the Application's base URL if you dont have a callback URL
Auth URL https://Gitlab.com/oauth/authorize
Access token URL https://Gitlab.com/oauth/token
Client ID Enter the Gitlab Application ID
Client secret Enter the Gitlab  Client secret
Scope api
Client Authentication Send as Basic Auth Header
 Rest API OAuth, API token, API Key authentication for Jira and Confluence Gitlab Access Token
  • Copy the Access Token or click on Use Token.
A sample access token from GitLab Provider looks like this.
e8ec210628306b1df26ff61e6b9b3195814a2d79d38a2c7c1dc5836f6ddd7143

Step 3: Fetch Username through Gitlab:

  • Choose the method type as "GET".
  • Enter the interoception Endpoint from the plugin to fetch the username in the Request URL. For Gitlab it is "https://gitlab.com/api/v4/user".
  • Go to the Authorization tab select the Bearer Token and enter the access token here.
  • Add the header "content-type: application/json" and click on Send.
 Rest API OAuth, API token, API Key authentication for Jira and Confluence Gitlab username
Request:
     curl 
     -X GET 
     -H "Authorization: Bearer <Access Token>" 
     -H "Content-type: application/json" 
     https://gitlab.com/api/v4/user
Copy the attribute value against the username, you will need to configure it in plugin. In this example, the value is "username".

Step 4:Configure the Rest API plugin:

Step 1: Enable Rest API Authentication:
  • After installing the app, navigate to the Global Settings tab.
  • Here you will have to Enable the Authentication through Enable REST API Authentication and click on Save.
  • Go to the OAuth/OIDC tab and in the dropdown provided select Gitlab as the OAuth provider.
  • Enter the attribute value against which we received the username in the Postman response.
  • Save the settings.
 Rest API OAuth, API token, API Key authentication for Jira and Confluence Gitlab rest api
Step 2: Disable Basic Authentication:
  • Disabling this will restrict all the REST API call made using Basic Authentication.

Step 5: Test REST API using access token:

  • Call any REST API. Include the access token in the Authorization header. Here’s an example of fetching content from Confluence.
  • Go to the Postman application select method type as GET and enter the Request URL. For eg. http://{Confluence_Base_URL}/confluence/rest/api/content/
  • In the Authorization tab select type as Bearer Token.
Rest API OAuth, API token, API Key authentication for Jira and Confluence Gitlab rest api  
  • In the Header tab add the header “content-type: application/json and send the request.
Rest API OAuth, API token, API Key authentication for Jira and Confluence Gitlab rest api
Request:
     curl 
     -X GET  
     -H "Authorization: Bearer <Access Token>" 
     -H "Content-type: application/json" 
     http://{confluence_base_url}/confluence/rest/api/content/
  • This will show the content in Confluence and will return the status 200.
  • If the token is invalid or missing, the call will return a 401 Unauthorized response


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