How To Add A Custom Header Value As A JWT Claim In WSO2 API Manager 4.3.0?

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Introduction

WSO2 API Manager is a popular open-source API management platform that provides a wide range of features for designing, deploying, and managing APIs. One of the key features of WSO2 API Manager is its ability to generate JSON Web Tokens (JWT) for authentication and authorization purposes. However, by default, the JWT generated by the WSO2 API Manager gateway does not include custom claims. In this article, we will explore how to add a custom header value as a JWT claim in WSO2 API Manager 4.3.0.

Use Case

Let's consider a scenario where we want to send a custom HTTP header (e.g., X-Custom-Id) in the request to the backend API. We can achieve this by adding a custom claim to the JWT generated by the WSO2 API Manager gateway. This custom claim can then be used by the backend API to authenticate and authorize the request.

Prerequisites

Before we begin, make sure you have the following prerequisites:

  • WSO2 API Manager 4.3.0 installed and running
  • A basic understanding of WSO2 API Manager and JWT
  • A custom HTTP header (e.g., X-Custom-Id) that you want to send in the request

Step 1: Create a Custom Claim

To add a custom claim to the JWT generated by the WSO2 API Manager gateway, we need to create a custom claim in the API Manager. Follow these steps:

  1. Log in to the WSO2 API Manager management console
  2. Navigate to the APIs section and click on Create API
  3. Fill in the required details and click on Create
  4. Click on the Edit button next to the API you just created
  5. Click on the Claims tab
  6. Click on the Add Claim button
  7. Fill in the required details for the custom claim, including the Claim URI and Claim Value
  8. Click on Add to add the custom claim

Step 2: Configure the API to Use the Custom Claim

Now that we have created a custom claim, we need to configure the API to use this claim. Follow these steps:

  1. Click on the Edit button next to the API you created
  2. Click on the API Resources tab
  3. Click on the Add Resource button
  4. Fill in the required details for the API resource, including the Resource URI and Method
  5. Click on the Add button to add the API resource
  6. Click on the Edit button next to the API resource you just created
  7. Click on the Inbound tab
  8. Click on the Add button to add a new inbound element
  9. Select Header as the Inbound Element Type
  10. Fill in the required details for the header, including the Header Name and Header Value
  11. Click on Add to add the header

Step 3: Configure the JWT Generator to Include the Custom Claim

Now that we have configured the API to use the custom claim, we need to configure JWT generator to include this claim in the JWT. Follow these steps:

  1. Click on the Edit button next to the API you created
  2. Click on the API Resources tab
  3. Click on the Add Resource button
  4. Fill in the required details for the API resource, including the Resource URI and Method
  5. Click on the Add button to add the API resource
  6. Click on the Edit button next to the API resource you just created
  7. Click on the Outbound tab
  8. Click on the Add button to add a new outbound element
  9. Select JWT Generator as the Outbound Element Type
  10. Click on the Edit button next to the JWT generator
  11. Click on the Claims tab
  12. Select the custom claim you created earlier
  13. Click on Add to add the custom claim to the JWT generator

Step 4: Test the API

Now that we have configured the API to use the custom claim and the JWT generator to include this claim in the JWT, we can test the API. Follow these steps:

  1. Send a request to the API using a tool like Postman or cURL
  2. Include the custom HTTP header (e.g., X-Custom-Id) in the request
  3. Verify that the custom claim is included in the JWT generated by the WSO2 API Manager gateway

Conclusion

In this article, we explored how to add a custom header value as a JWT claim in WSO2 API Manager 4.3.0. We created a custom claim, configured the API to use this claim, and configured the JWT generator to include this claim in the JWT. We then tested the API to verify that the custom claim is included in the JWT generated by the WSO2 API Manager gateway. By following these steps, you can add custom claims to the JWT generated by the WSO2 API Manager gateway and use them for authentication and authorization purposes.

Additional Resources

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Introduction

In our previous article, we explored how to add a custom header value as a JWT claim in WSO2 API Manager 4.3.0. In this article, we will answer some frequently asked questions (FAQs) related to WSO2 API Manager 4.3.0 JWT custom claims.

Q: What is a JWT custom claim?

A: A JWT custom claim is a custom attribute that can be added to the JSON Web Token (JWT) generated by the WSO2 API Manager gateway. This custom claim can be used for authentication and authorization purposes.

Q: Why do I need to add a custom claim to the JWT?

A: You need to add a custom claim to the JWT if you want to include additional information in the JWT that is not included by default. This can be useful for authentication and authorization purposes, such as including a custom user ID or role.

Q: How do I add a custom claim to the JWT?

A: To add a custom claim to the JWT, you need to create a custom claim in the WSO2 API Manager management console, configure the API to use this claim, and configure the JWT generator to include this claim in the JWT.

Q: What are the benefits of using JWT custom claims?

A: The benefits of using JWT custom claims include:

  • Improved security: JWT custom claims can be used to include additional security-related information in the JWT, such as a custom user ID or role.
  • Enhanced authentication and authorization: JWT custom claims can be used to authenticate and authorize users based on custom attributes.
  • Increased flexibility: JWT custom claims can be used to include custom attributes in the JWT that are not included by default.

Q: How do I configure the JWT generator to include a custom claim?

A: To configure the JWT generator to include a custom claim, you need to follow these steps:

  1. Click on the Edit button next to the API you created
  2. Click on the API Resources tab
  3. Click on the Add Resource button
  4. Fill in the required details for the API resource, including the Resource URI and Method
  5. Click on the Add button to add the API resource
  6. Click on the Edit button next to the API resource you just created
  7. Click on the Outbound tab
  8. Click on the Add button to add a new outbound element
  9. Select JWT Generator as the Outbound Element Type
  10. Click on the Edit button next to the JWT generator
  11. Click on the Claims tab
  12. Select the custom claim you created earlier
  13. Click on Add to add the custom claim to the JWT generator

Q: How do I test the API with a custom claim?

A: To test the API with a custom claim, you need to follow these steps:

  1. Send a request to the API using a tool like Postman or cURL
  2. Include the custom HTTP header (e.g., X-Custom-Id) in the request
  3. Verify that the custom claim is included in the JWT generated the WSO2 API Manager gateway

Q: What are some common issues that can occur when using JWT custom claims?

A: Some common issues that can occur when using JWT custom claims include:

  • The custom claim is not included in the JWT
  • The custom claim is not validated correctly
  • The custom claim is not used correctly in the API

Q: How do I troubleshoot issues with JWT custom claims?

A: To troubleshoot issues with JWT custom claims, you need to follow these steps:

  1. Check the WSO2 API Manager logs for errors
  2. Verify that the custom claim is included in the JWT
  3. Verify that the custom claim is validated correctly
  4. Verify that the custom claim is used correctly in the API

Conclusion

In this article, we answered some frequently asked questions (FAQs) related to WSO2 API Manager 4.3.0 JWT custom claims. We covered topics such as what a JWT custom claim is, why you need to add a custom claim to the JWT, how to add a custom claim to the JWT, and how to troubleshoot issues with JWT custom claims. By following these steps, you can add custom claims to the JWT generated by the WSO2 API Manager gateway and use them for authentication and authorization purposes.

Additional Resources