plugin.rb

# name: Discourse Minecraft Avatar
# about: Changes the user avatars to use their Minecraft skins
# version: 1.0.0
# authors: Jacob Gillespie
# url: https://github.com/the-obsidian/discourse-minecraft-avatar
after_initialize do
  # override User avatar
  class User
    MC_BASE_URI = 'https://api.mojang.com/users/profiles/minecraft'

    def minecraft_uuid
      uuid = try(:single_sign_on_record).try(:external_id)

      return uuid if uuid

      uri = "#{MC_BASE_URI}/#{username}?at=#{Time.now.to_i}"
      response = RestClient.get uri
      return false if response.code != 200

      begin
        JSON.parse(response.body)['id']
      rescue StandardError => _e
        1 # return a default
      end
    end

    def minecraft_avatar
      "https://crafatar.com/avatars/#{minecraft_uuid}?overlay=true&size={size}"
    end

    def avatar_template
      return minecraft_avatar unless uploaded_avatar_id
      hostname = RailsMultisite::ConnectionManagement.current_hostname
      UserAvatar.local_avatar_template(
        hostname, username.downcase, uploaded_avatar_id
      )
    end
  end
end