diaspora/app/controllers/api/openid_connect/clients_controller.rb

module Api
  module OpenidConnect
    class ClientsController < ApplicationController
      rescue_from OpenIDConnect::HttpError do |e|
        http_error_page_as_json(e)
      end

      rescue_from OpenIDConnect::ValidationFailed, ActiveRecord::RecordInvalid do |e|
        validation_fail_as_json(e)
      end

      def create
        registrar = OpenIDConnect::Client::Registrar.new(request.url, params)
        client = Api::OpenidConnect::OAuthApplication.register! registrar
        render json: client.as_json(root: false)
      end

      def find
        client = Api::OpenidConnect::OAuthApplication.find_by(client_name: params[:client_name])
        if client
          render json: {client_id: client.client_id}
        else
          render json: {error: "Client with name #{params[:client_name]} does not exist"}
        end
      end

      private

      def http_error_page_as_json(e)
        render json:
                 {
                   error:             :invalid_request,
                   error_description: e.message
                 }, status: 400
      end

      def validation_fail_as_json(e)
        render json:
                 {
                   error:             :invalid_client_metadata,
                   error_description: e.message
                 }, status: 400
      end
    end
  end
end