elct9620

RFC: Stateless OAuth Client Identity for Ephemeral (DCR) Clients on a Doorkeeper-style Provider

Category	Informational / Design Pattern
Status	Draft — distilled from production experience
Applies to	Rails + Doorkeeper OAuth providers (Ruby), serving MCP or other dynamically-registered clients
Author	Aotokitsuruya（蒼時弦也）
Date	2026-06-21
Audience	Engineers who must host OAuth for dynamically-registered, one-time, unbounded clients (typically MCP agents) on top of Doorkeeper

elct9620

# frozen_string_literal: true

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'

  gem 'dotenv'
  gem 'autoflux'
  gem 'autoflux-openai'

elct9620

# frozen_string_literal: true

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'

  gem 'dotenv'
  gem 'ruby-openai'
end

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{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Generated schema for Root",
  "type": "object",
  "properties": {
    "name": {
      "type": "string"
    },
    "id": {
      "type": "string"

elct9620

Hugo to Embedding Example

Convert Hugo articles to Embendding for Cloudflare Vectorize Store

Add JSON output to Hugo

The single.json is a example to add JSON outptu for your theme.

Setup a new config ai.toml to extend output

elct9620

paginator = InfinitePaginator.new(
  'https://jsonplaceholder.typicode.com/users/%<page>d'
)

pp paginator.take(12)
# =>
# [{"id"=>1, "name"=>"Leanne Graham"},
# {"id"=>2, "name"=>"Ervin Howell"},
# {"id"=>3, "name"=>"Clementine Bauch"},
# {"id"=>4, "name"=>"Patricia Lebsack"},

elct9620

The Data Context Interaction in Ruby

Concept

Under Domain-Driven Design, we are trying to "Model" the real world to the virtual world. However, it cannot clearly describe the context/interaction with the domain.

Data

The raw data is a "number" or "string" and cannot explain the meaning in specifying the domain. Therefore we have to create a "value object" to assign the domain meaning and use "entity" to compose mapping a real-world object.

elct9620

Example of Domain-Driven Design in Rails

Object

Name	Layer	Type	Description
app/models/visitor_pass.rb	Domain	Aggregate	Pass-related domain
app/services/tracker_service.rb	Domain	Domain Service	Logic between door and visitor interaction
app/controllers/passes_controller.rb	Application	Use Case	The user flow of "pass" a door

elct9620

require 'dry-contaienr'
require 'dry-auto_inject'

# Singleton style container
class Container
  extend Dry::Container::Mixin

  namespace :repositories do
    register(:games) { GameRepository.new }
    register(:players) { PlayerRepository.new }

elct9620

# API
class FakeResponse < Struct.new(:status, :code)
  def success?
    code == 200
  end
end

class FakeAPI
  def call
    FakeResponse.new('Success', 200)