Custom Keycloak Theme Development (Starter Pack)

Starter setup for development of custom keycloak themes (e.g. login theme) or customization of existing themes. This project is based on Keycloak 20.x.x.

Requirements:

Docker

Description:

Provided docker-compose.yml file can be used to build development environment for custom keycloak themes development. Configuration will create postgres database container with persistent data volume (to not lose keycloak configuration in case container is recreated). Additionally it will create keycloak identity server container which is configured for development purposes (basic auth, no authentication for postgresql) and runs in development mode (default mode).
Folder ./themes/ is mounted in Keycloak identity server to immediately apply all changes made in ./themes/ folder to keycloak server.
Remember when deploying themes to production keycloak server (server which runs in production mode) you will have to restart keycloak server for changes to take effect.
Example of custom theme named "custom_theme_example" is provided and will be automatically loaded into keycloak as described above.

Build Development environment

To build keycloak identity server from docker-compose.yml file position yourself in project directory and run:

docker compose up -d

After a short time keycloak administration console should be available using the next link: http://localhost:8888
Default credentials: admin/admin

Configure Keycloak server to use provided example

This procedure should be performed first time you build keycloak identity server from provided docker-compose.yml file. Changes will be persisted to .postgres_data folder and automatically applied next time you rebuild it.

Create new realm
Make sure that newly created realm is selected. All subsequent changes should be done in newly created realm.
Create a new client with default settings. For easier testing set valid redirect URLs and web origins to *

Create test user. Don't forget to set a password.
Open realm settings and choose Themes tab. Change login theme to custom_theme_example.

Now login screen for newly created realm will use custom theme.

Notes for development

You have to follow a strict structure in ./themes/ folder.
- First subfolder level represents new theme and it is used as a theme name. e.g. ./themes/custom_theme/ theme name in keycloak would be "custom_theme"
- Second subfolder level represents theme type. One theme can have multiple types. e.g. ./themes/custom_theme/login/
  - Possible types:
    - Account management: account
    - Admin console: admin
    - Emails: email
    - Login forms: login
    - Welcome page: welcome
You can find existing keycloak resources (templates) which can be modified in default keycloak themes https://github.com/keycloak/keycloak/tree/main/themes/src/main/resources/theme

Additional information

Keycloak Server Development / Themes Documentation
- https://www.keycloak.org/docs/latest/server_development/#_themes
- https://github.com/keycloak/keycloak-documentation/blob/main/server_development/topics/themes.adoc
You can also use keycloakify for theme customization: https://docs.keycloakify.dev/

Andrej988 / keycloak-custom-theme-dev