Add WKD policy endpoint

app/controllers/web_key_directory_controller.rb

@@ -28,4 +28,8 @@ class WebKeyDirectoryController < WellKnownController
       end
     end
   end
+
+  def policy
+    head :ok
+  end
 end

config/routes.rb

@@ -73,6 +73,7 @@ Rails.application.routes.draw do
   get '.well-known/lnurlp/:username', to: 'lnurlpay#index', as: :lightning_address
   get '.well-known/keysend/:username', to: 'lnurlpay#keysend', as: :lightning_address_keysend
   get '.well-known/openpgpkey/hu/:hashed_username(.:format)', to: 'web_key_directory#show', as: :wkd_key
+  get '.well-known/openpgpkey/policy', to: 'web_key_directory#policy'
 
   get 'lnurlpay/:username/invoice', to: 'lnurlpay#invoice', as: :lnurlpay_invoice
 

spec/requests/web_key_directory_spec.rb

@@ -1,6 +1,14 @@
 require 'rails_helper'
 
 RSpec.describe "OpenPGP Web Key Directory", type: :request do
+  describe "policy" do
+    it "returns an empty 200 response" do
+      get "/.well-known/openpgpkey/policy"
+      expect(response).to have_http_status(:ok)
+      expect(response.body).to be_empty
+    end
+  end
+
   describe "non-existent user" do
     it "returns a 404 status" do
       get "/.well-known/openpgpkey/hu/fmb8gw3n4zdj4xpwaziki4mwcxr1368i?l=aristotle"