Add NIP-05 well-known endpoint

app/controllers/well_known_controller.rb

@@ -0,0 +1,16 @@
+class WellKnownController < ApplicationController
+  def nostr
+    http_status :unprocessable_entity and return if params[:name].blank?
+    domain = request.headers["X-Forwarded-Host"].presence || Setting.primary_domain
+    @user = User.where(cn: params[:name], ou: domain).first
+    http_status :not_found and return if @user.nil? || @user.nostr_pubkey.blank?
+
+    respond_to do |format|
+      format.json do
+        render json: {
+          names: { "#{@user.cn}": @user.nostr_pubkey }
+        }.to_json
+      end
+    end
+  end
+end

config/routes.rb

@@ -44,6 +44,8 @@ Rails.application.routes.draw do
   get 'keysend/:address', to: 'lnurlpay#keysend',
     as: 'lightning_address_keysend', constraints: { address: /[^\/]+/}
 
+  get '.well-known/nostr', to: 'well_known#nostr'
+
   post 'webhooks/lndhub', to: 'webhooks#lndhub'
 
   namespace :api do

spec/requests/well_known_spec.rb

@@ -0,0 +1,41 @@
+require 'rails_helper'
+
+RSpec.describe "Well-known URLs", type: :request do
+  describe "GET /nostr" do
+    context "without username param" do
+      it "returns a 422 status" do
+        get "/.well-known/nostr.json"
+        expect(response).to have_http_status(:unprocessable_entity)
+      end
+    end
+
+    context "non-existent user" do
+      it "returns a 404 status" do
+        get "/.well-known/nostr.json?name=bob"
+        expect(response).to have_http_status(:not_found)
+      end
+    end
+
+    context "user does not have a nostr pubkey configured" do
+      let(:user) { create :user, cn: 'spongebob', ou: 'kosmos.org' }
+
+      it "returns a 404 status" do
+        get "/.well-known/nostr.json?name=spongebob"
+        expect(response).to have_http_status(:not_found)
+      end
+    end
+
+    context "user with nostr pubkey" do
+      let(:user) { create :user, cn: 'bobdylan', ou: 'kosmos.org', nostr_pubkey: '438d35a6750d0dd6b75d032af8a768aad76b62f0c70ecb45f9c4d9e63540f7f4' }
+      before { user.save! }
+
+      it "returns a NIP-05 response" do
+        get "/.well-known/nostr.json?name=bobdylan"
+        expect(response).to have_http_status(:ok)
+        res = JSON.parse(response.body)
+        expect(res["names"].keys.size).to eq(1)
+        expect(res["names"]["bobdylan"]).to eq(user.nostr_pubkey)
+      end
+    end
+  end
+end