Apply themes from theme.park to supported applications.

All credit for design and styling to the various contributors to https://github.com/GilbN/theme.park!

Here is a list of features: (current [x], planned [ ], and potential ?)

• Support for all supported themes and apps in theme.park
• Supports service side compression:
  • gzip - gzip
  • deflate - zlib
  • ? br - brotli (currently unsupported in Yaegi for Traefik plugins)
• Limits the HTTP queries which are touched by plugin to improve performance
• Updates requests to limit requests' Accept-Encoding to include only supported systems

experimental:
    plugins:
        themepark:
            moduleName: "github.com/packruler/traefik-themepark"
            version: "v1.2.2"

To configure the theme.park plugin you should create a middleware in your dynamic configuration as explained here. The following example creates and uses the themepark middleware plugin to replace all foo occurences by bar in the HTTP response body.

The app and theme values passed to the plugin should match the <style> tag provided in the Installation section. The example below would match Installation section having the following <style> tag.

<link rel="stylesheet" type="text/css" href="https://theme-park.dev/css/base/sonarr/dark.css">

http:
  routers:
    my-router:
      rule: "Host(`localhost`)"
      middlewares:
        - "sonarr-dark"
      service: "my-service"

  middlewares:
    sonarr-dark:
      plugin:
        themepark:
          # The name of the supported application listed on https://docs.theme-park.dev/themes.
          app: sonarr

          # The name of the supported theme listed on https://docs.theme-park.dev/theme-options/ or https://docs.theme-park.dev/community-themes/
          theme: dark

          # baseUrl is optional if you want to use a self-hosted version of theme.park
          baseUrl: https://theme-park.domain.tld

          # This currently only supports '4k-logo' and 'darker' addons. Future addons that follow a similar syntax will work as well.
          # For refernce: https://docs.theme-park.dev/themes/addons/
          addons:
            - 4k-logo
    radarr-theme:
      plugin:
        themepark:
          # The name of the supported application listed on https://docs.theme-park.dev/themes.
          app: radarr

          # If using the 'darker' addon the theme MUST be excluded or set to 'base'
          theme: base

          # Multiple addons can be included at the same time
          addons:
            - darker
            - 4k-logo

  services:
    my-service:
      loadBalancer:
        servers:
          - url: "http://127.0.0.1"

This is an extension of the rewrite-body plugin I created based on Traefik's plugin-rewritebody to add support for compressed content.

That said, this plugin is more focused on theme.park support and allows more targetted middleware logic. This means the overhead added by the plugin's logic is very limited. You can read more about that in the process section.

For any updates to be attempted the following conditions must be met by the incoming request:

• Accept header must include text/html
• HTTP Method must be GET

These conditions are intended to drastically limit the HTTP queries that are touched by this plugin. At this time these conditions properly cover all tested applications.

Assuming Supported Request conditions have been met, the following conditions must be met by the resulting response:

• Content-Type must be text/html
• Content-Encoding must be a support compression (gzip, deflate, or identity)