Devolver la llave pública de VAPID

Gemfile.lock

@@ -88,7 +88,7 @@ GEM
     msgpack (1.2.9)
     multi_json (1.13.1)
     nio4r (2.3.1)
-    nokogiri (1.10.3)
+    nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
     parallel (1.17.0)
     parser (2.6.3.0)

app/controllers/webpush_subscriptions_controller.rb

@@ -4,6 +4,13 @@
 class WebpushSubscriptionsController < ApplicationController
   before_action :authenticate!
 
+  # POST /webpush_subscriptions
+  #
+  # Genera una suscripción Webpush
+  #
+  # @param Hash {
+  #               webpush_subscription: {
+  #                 endpoint: @string, auth: @string, p256dh: @string } }
   def create
     @subscription = current_pirata.webpush_subscriptions
                                   .build(subscriptions_params)
@@ -17,6 +24,15 @@ class WebpushSubscriptionsController < ApplicationController
     end
   end
 
+  # GET /webpush_subscriptions/vapid/public_key
+  #
+  # Devuelve la llave pública VAPID para suscribirse a Webpush
+  #
+  # @return Hash { vapid: { public_key: @string } }
+  def vapid_public_key
+    render 'webpush_subscriptions/vapid/public_key'
+  end
+
   private
 
   def subscriptions_params

app/models/webpush_subscription.rb

@@ -14,8 +14,8 @@ class WebpushSubscription < ApplicationRecord
     Webpush.payload_send(
       vapid: {
         subject: 'mailto:lumi@partidopirata.com.ar',
-        public_key: Rails.application.credentials.vapid.public_key,
-        private_key: Rails.application.credentials.vapid.private_key
+        public_key: Rails.application.credentials.vapid[:public_key],
+        private_key: Rails.application.credentials.vapid[:private_key]
       },
       endpoint: endpoint, auth: auth, p256dh: p256dh,
       ttl: ttl.to_i, urgency: normalize_urgency(urgency),

app/views/webpush_subscriptions/vapid/public_key.json.jbuilder

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+json.vapid do
+  json.public_key Rails.application.credentials.vapid[:public_key]
+end

config/routes.rb

@@ -4,6 +4,9 @@ Rails.application.routes.draw do
   get '/piratas/yo', to: 'piratas#yo'
   # No queremos un índice de piratas
   resources :piratas, only: %i[create]
+  # Obtener la llave VAPID para suscripciones
+  get '/webpush_subscriptions/vapid/public_key',
+      to: 'webpush_subscriptions#vapid_public_key'
   # Solo se pueden crear suscripciones
   resources :webpush_subscriptions, only: %i[create]
   # Podemos crear barcas y dentro de ellas consensos

test/controllers/webpush_subscriptions_controller_test.rb

@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require 'test_helper'
 class PiratasControllerTest < ActionDispatch::IntegrationTest
   setup do
     @pirata = create :pirata
@@ -36,4 +37,14 @@ class PiratasControllerTest < ActionDispatch::IntegrationTest
 
     assert_equal 204, @response.status
   end
+
+  test 'se puede obtener la llave pública VAPID' do
+    get webpush_subscriptions_vapid_public_key_url,
+        as: :json, headers: @auth
+
+    body = JSON.parse response.body
+
+    assert body['vapid'].present?
+    assert body['vapid']['public_key'].present?
+  end
 end