Unlock the Power of Custom Keycloak Language: A Step-by-Step Guide

Keycloak, the popular open-source identity and access management solution, offers a wide range of features to customize and tailor its functionality to your needs. One of the most powerful features is the ability to create a custom Keycloak language. In this article, we’ll delve into the world of custom Keycloak languages and provide a comprehensive guide on how to create and implement your own language pack.

Why Custom Keycloak Language?

Out of the box, Keycloak supports a multitude of languages, but what if your organization requires a language that’s not on the list? Or what if you want to create a customized language experience for your users? This is where custom Keycloak languages come into play. By creating a custom language, you can:

• Support unique language requirements for your organization
• Enhance the user experience for your users
• Differentiate your Keycloak instance from others

Prerequisites

Before we dive into the creation process, make sure you have the following:

1. A working Keycloak instance (version 10.0.0 or higher)
2. A basic understanding of Java and Maven
3. A code editor or IDE of your choice

Step 1: Creating the Language Project

Create a new Maven project in your preferred IDE with the following structure:

custom-language-project/
  └── src
      └── main
          ├── java
          │   └── LanguagePack.java
          ├── resources
          │   └── language.properties
          └── pom.xml

In the `pom.xml` file, add the following dependencies:

<dependency>
  <groupId>org.keycloak</groupId>
  <artifactId>keycloak-server-spi</artifactId>
  <version>10.0.0</version>
</dependency>
<dependency>
  <groupId>org.keycloak</groupId>
  <artifactId>keycloak-common</artifactId>
  <version>10.0.0</version>
</dependency>

Step 2: Defining the Language Properties

In the `language.properties` file, define the language properties for your custom language. For example:

language.name=My Custom Language
language.label=My Custom Language
language.description=This is a custom language for my organization

These properties will be used to identify your custom language within Keycloak.

Step 3: Implementing the Language Pack

In the `LanguagePack.java` file, implement the `LanguagePack` interface:

import org.keycloak.provider.LanguagePack;

public class LanguagePack implements org.keycloak.provider.LanguagePack {
  @Override
  public String getName() {
    return "My Custom Language";
  }

  @Override
  public String getLabel() {
    return "My Custom Language";
  }

  @Override
  public String getDescription() {
    return "This is a custom language for my organization";
  }

  @Override
  public ResourceBundle getResourceBundle() {
    return ResourceBundle.getBundle("language", Locale.ROOT);
  }
}

This implementation provides the necessary information for Keycloak to recognize your custom language.

Step 4: Building and Deploying the Language Pack

Compile and package your language project using Maven:

mvn clean package

This will generate a JAR file containing your custom language pack.

Copy the JAR file to the `standalone/deployments` directory of your Keycloak server.

Step 5: Configuring Keycloak to Use the Custom Language

Restart your Keycloak server and navigate to the Realm Settings > Login page.

In the Language section, select the “My Custom Language” option:

Language

EnglishMy Custom Language

Click Save to apply the changes.

Testing the Custom Language

Navigate to the Keycloak login page and select your custom language from the language dropdown:

http://localhost:8080/auth/realms/master/login?lang=custom

You should now see the custom language in action!

Conclusion

Creating a custom Keycloak language is a powerful way to tailor the user experience to your organization’s unique needs. By following this step-by-step guide, you can unlock the full potential of Keycloak and provide a customized language experience for your users.

Remember to experiment with different language properties and implementations to create a truly unique experience. Happy coding!

Additional Resources

For more information on Keycloak and its customization options, refer to the official Keycloak documentation:

• Keycloak Server Development Guide
• Keycloak Server Administration Guide

Stay tuned for more Keycloak-related articles and guides!

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