Custom JWT Transformer

This repository contains a sample custom JWT transformer for WSO2 API Manager (APIM) version 4.1.0. The transformer modifies incoming JWT roles claim as needed, specifically converting the roles claim from an array to a string if the token's issuer is http://localhost:8080/realms/master.

Example Transformation If the incoming JWT contains the following roles claim:

"roles": [
    "default-roles-master",
    "offline_access",
    "uma_authorization"
]

The transformer will convert it to:

"roles": "default-roles-master offline_access uma_authorization"

This repository serves as an example, and you can customize the transformer to modify any claims as per your requirements.

Prerequisites

• WSO2 API Manager 4.1.0
• Maven build tool

How to Use

Build the Project Use Maven to build the project:

mvn clean install

Deploy the JAR File

After building, locate the generated JAR file in the target folder. Copy the JAR file to the:

<API-M_HOME>/repository/components/dropins directory

Restart the Server

Restart the WSO2 API Manager to apply the changes.

References

JWT Claim Transformation Documentation