Kyomu Nostr Relay

kyomu.rb

#!/usr/bin/env ruby
# frozen_string_literal: true

require "bundler/inline"

gemfile do
  source "https://rubygems.org"
  gem "falcon", "~> 0.55.3"
  gem "async-websocket", "~> 0.30.0"
end

require "json"
require "async/websocket/adapters/rack"
require "falcon/rackup/handler"

app = lambda do |env|
  Async::WebSocket::Adapters::Rack.open(env, protocols: ["ws"]) do |connection|
    while message = connection.read
      payload = JSON.parse(message)
      case payload[0]
      when "EVENT"
        connection.write JSON.dump(["OK", payload[1], true, ""])
      when "REQ"
        connection.write JSON.dump(["EOSE", payload[1]])
      end
      connection.flush
    end
  end or [200, {}, ["Please use a Nostr client to connect."]]
end

puts "Falcon listening on http://localhost:9292"
begin
  Falcon::Rackup::Handler.run(app, Host: "localhost", Port: 9292)
rescue Interrupt
end