Add REST API for Web Push Notifications subscriptions (#7445)

- POST /api/v1/push/subscription
- PUT /api/v1/push/subscription
- DELETE /api/v1/push/subscription
- New OAuth scope: "push" (required for the above methods)

app/controllers/api/v1/push/subscriptions_controller.rb

@@ -0,0 +1,50 @@
+# frozen_string_literal: true
+
+class Api::V1::Push::SubscriptionsController < Api::BaseController
+  before_action -> { doorkeeper_authorize! :push }
+  before_action :require_user!
+  before_action :set_web_push_subscription
+
+  def create
+    @web_subscription&.destroy!
+
+    @web_subscription = ::Web::PushSubscription.create!(
+      endpoint: subscription_params[:endpoint],
+      key_p256dh: subscription_params[:keys][:p256dh],
+      key_auth: subscription_params[:keys][:auth],
+      data: data_params,
+      user_id: current_user.id,
+      access_token_id: doorkeeper_token.id
+    )
+
+    render json: @web_subscription, serializer: REST::WebPushSubscriptionSerializer
+  end
+
+  def update
+    raise ActiveRecord::RecordNotFound if @web_subscription.nil?
+
+    @web_subscription.update!(data: data_params)
+
+    render json: @web_subscription, serializer: REST::WebPushSubscriptionSerializer
+  end
+
+  def destroy
+    @web_subscription&.destroy!
+    render_empty
+  end
+
+  private
+
+  def set_web_push_subscription
+    @web_subscription = ::Web::PushSubscription.find_by(access_token_id: doorkeeper_token.id)
+  end
+
+  def subscription_params
+    params.require(:subscription).permit(:endpoint, keys: [:auth, :p256dh])
+  end
+
+  def data_params
+    return {} if params[:data].blank?
+    params.require(:data).permit(alerts: [:follow, :favourite, :reblog, :mention])
+  end
+end

app/controllers/api/web/push_subscriptions_controller.rb

@@ -31,22 +31,23 @@ class Api::Web::PushSubscriptionsController < Api::Web::BaseController
       endpoint: subscription_params[:endpoint],
       key_p256dh: subscription_params[:keys][:p256dh],
       key_auth: subscription_params[:keys][:auth],
-      data: data
+      data: data,
+      user_id: active_session.user_id,
+      access_token_id: active_session.access_token_id
     )
 
     active_session.update!(web_push_subscription: web_subscription)
 
-    render json: web_subscription.as_payload
+    render json: web_subscription, serializer: REST::WebPushSubscriptionSerializer
   end
 
   def update
     params.require([:id])
 
     web_subscription = ::Web::PushSubscription.find(params[:id])
-
     web_subscription.update!(data: data_params)
 
-    render json: web_subscription.as_payload
+    render json: web_subscription, serializer: REST::WebPushSubscriptionSerializer
   end
 
   private
@@ -56,6 +57,6 @@ class Api::Web::PushSubscriptionsController < Api::Web::BaseController
   end
 
   def data_params
-    @data_params ||= params.require(:data).permit(:alerts)
+    @data_params ||= params.require(:data).permit(alerts: [:follow, :favourite, :reblog, :mention])
   end
 end

app/controllers/shares_controller.rb

@@ -15,6 +15,7 @@ class SharesController < ApplicationController
 
   def initial_state_params
     text = [params[:title], params[:text], params[:url]].compact.join(' ')
+
     {
       settings: Web::Setting.find_by(user: current_user)&.data || {},
       push_subscription: current_account.user.web_push_subscription(current_session),

app/models/user.rb

@@ -245,7 +245,7 @@ class User < ApplicationRecord
   end
 
   def web_push_subscription(session)
-    session.web_push_subscription.nil? ? nil : session.web_push_subscription.as_payload
+    session.web_push_subscription.nil? ? nil : session.web_push_subscription
   end
 
   def invite_code=(code)

app/models/web/push_subscription.rb

@@ -10,31 +10,44 @@
 #  data            :json
 #  created_at      :datetime         not null
 #  updated_at      :datetime         not null
+#  access_token_id :bigint(8)
+#  user_id         :bigint(8)
 #
 
-require 'webpush'
-
 class Web::PushSubscription < ApplicationRecord
+  belongs_to :user, optional: true
+  belongs_to :access_token, class_name: 'Doorkeeper::AccessToken', optional: true
+
   has_one :session_activation
 
   def push(notification)
-    I18n.with_locale(session_activation.user.locale || I18n.default_locale) do
+    I18n.with_locale(associated_user.locale || I18n.default_locale) do
       push_payload(message_from(notification), 48.hours.seconds)
     end
   end
 
   def pushable?(notification)
-    data&.key?('alerts') && data['alerts'][notification.type.to_s]
+    data&.key?('alerts') && ActiveModel::Type::Boolean.new.cast(data['alerts'][notification.type.to_s])
   end
 
-  def as_payload
-    payload = { id: id, endpoint: endpoint }
-    payload[:alerts] = data['alerts'] if data&.key?('alerts')
-    payload
+  def associated_user
+    return @associated_user if defined?(@associated_user)
+
+    @associated_user = if user_id.nil?
+                         session_activation.user
+                       else
+                         user
+                       end
   end
 
-  def access_token
+  def associated_access_token
+    return @associated_access_token if defined?(@associated_access_token)
+
+    @associated_access_token = if access_token_id.nil?
                                  find_or_create_access_token.token
+                               else
+                                 access_token
+                               end
   end
 
   private

app/serializers/initial_state_serializer.rb

@@ -2,7 +2,9 @@
 
 class InitialStateSerializer < ActiveModel::Serializer
   attributes :meta, :compose, :accounts,
-             :media_attachments, :settings, :push_subscription
+             :media_attachments, :settings
+
+  has_one :push_subscription, serializer: REST::WebPushSubscriptionSerializer
 
   def meta
     store = {

app/serializers/rest/web_push_subscription_serializer.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class REST::WebPushSubscriptionSerializer < ActiveModel::Serializer
+  attributes :id, :endpoint, :alerts, :server_key
+
+  def alerts
+    object.data&.dig('alerts') || {}
+  end
+
+  def server_key
+    Rails.configuration.x.vapid_public_key
+  end
+end

app/serializers/web/notification_serializer.rb

@@ -54,7 +54,7 @@ class Web::NotificationSerializer < ActiveModel::Serializer
 
     def access_token
       return if actions.empty?
-      current_push_subscription.access_token
+      current_push_subscription.associated_access_token
     end
 
     def message

app/services/notify_service.rb

@@ -9,6 +9,7 @@ class NotifyService < BaseService
     return if recipient.user.nil? || blocked?
 
     create_notification
+    push_notification if @notification.browserable?
     send_email if email_enabled?
   rescue ActiveRecord::RecordInvalid
     return
@@ -101,25 +102,27 @@ class NotifyService < BaseService
 
   def create_notification
     @notification.save!
-    return unless @notification.browserable?
+  end
+
+  def push_notification
+    return if @notification.activity.nil?
+
     Redis.current.publish("timeline:#{@recipient.id}", Oj.dump(event: :notification, payload: InlineRenderer.render(@notification, @recipient, :notification)))
     send_push_notifications
   end
 
   def send_push_notifications
-    # HACK: Can be caused by quickly unfavouriting a status, since creating
-    # a favourite and creating a notification are not wrapped in a transaction.
-    return if @notification.activity.nil?
+    subscriptions_ids = ::Web::PushSubscription.where(user_id: @recipient.user.id)
+                                               .select { |subscription| subscription.pushable?(@notification) }
+                                               .map(&:id)
 
-    sessions_with_subscriptions = @recipient.user.session_activations.where.not(web_push_subscription: nil)
-    sessions_with_subscriptions_ids = sessions_with_subscriptions.select { |session| session.web_push_subscription.pushable? @notification }.map(&:id)
-
-    WebPushNotificationWorker.push_bulk(sessions_with_subscriptions_ids) do |session_activation_id|
-      [session_activation_id, @notification.id]
+    ::Web::PushNotificationWorker.push_bulk(subscriptions_ids) do |subscription_id|
+      [subscription_id, @notification.id]
     end
   end
 
   def send_email
+    return if @notification.activity.nil?
     NotificationMailer.public_send(@notification.type, @recipient, @notification).deliver_later
   end
 

app/workers/web/push_notification_worker.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+class Web::PushNotificationWorker
+  include Sidekiq::Worker
+
+  sidekiq_options backtrace: true
+
+  def perform(subscription_id, notification_id)
+    subscription = ::Web::PushSubscription.find(subscription_id)
+    notification = Notification.find(notification_id)
+
+    subscription.push(notification) unless notification.activity.nil?
+  rescue Webpush::InvalidSubscription, Webpush::ExpiredSubscription
+    subscription.destroy!
+  rescue ActiveRecord::RecordNotFound
+    true
+  end
+end

app/workers/web_push_notification_worker.rb

@@ -1,25 +0,0 @@
-# frozen_string_literal: true
-
-class WebPushNotificationWorker
-  include Sidekiq::Worker
-
-  sidekiq_options backtrace: true
-
-  def perform(session_activation_id, notification_id)
-    session_activation = SessionActivation.find(session_activation_id)
-    notification       = Notification.find(notification_id)
-
-    return if session_activation.web_push_subscription.nil? || notification.activity.nil?
-
-    session_activation.web_push_subscription.push(notification)
-  rescue Webpush::InvalidSubscription, Webpush::ExpiredSubscription
-    # Subscription expiration is not currently implemented in any browser
-
-    session_activation.web_push_subscription.destroy!
-    session_activation.update!(web_push_subscription: nil)
-
-    true
-  rescue ActiveRecord::RecordNotFound
-    true
-  end
-end

config/initializers/doorkeeper.rb

@@ -55,7 +55,7 @@ Doorkeeper.configure do
   # For more information go to
   # https://github.com/doorkeeper-gem/doorkeeper/wiki/Using-Scopes
   default_scopes  :read
-  optional_scopes :write, :follow
+  optional_scopes :write, :follow, :push
 
   # Change the way client credentials are retrieved from the request object.
   # By default it retrieves first from the `HTTP_AUTHORIZATION` header, then

config/locales/doorkeeper.en.yml

@@ -115,5 +115,6 @@ en:
         title: OAuth authorization required
     scopes:
       follow: follow, block, unblock and unfollow accounts
+      push: receive push notifications for your account
       read: read your account's data
       write: post on your behalf

config/routes.rb

@@ -306,6 +306,10 @@ Rails.application.routes.draw do
       resources :lists, only: [:index, :create, :show, :update, :destroy] do
         resource :accounts, only: [:show, :create, :destroy], controller: 'lists/accounts'
       end
+
+      namespace :push do
+        resource :subscription, only: [:create, :update, :destroy]
+      end
     end
 
     namespace :web do

db/migrate/20180510214435_add_access_token_id_to_web_push_subscriptions.rb

@@ -0,0 +1,6 @@
+class AddAccessTokenIdToWebPushSubscriptions < ActiveRecord::Migration[5.2]
+  def change
+    add_reference :web_push_subscriptions, :access_token, null: true, default: nil, foreign_key: { on_delete: :cascade, to_table: :oauth_access_tokens }, index: false
+    add_reference :web_push_subscriptions, :user, null: true, default: nil, foreign_key: { on_delete: :cascade }, index: false
+  end
+end

db/migrate/20180510230049_migrate_web_push_subscriptions.rb

@@ -0,0 +1,13 @@
+class MigrateWebPushSubscriptions < ActiveRecord::Migration[5.2]
+  disable_ddl_transaction!
+
+  def up
+    add_index :web_push_subscriptions, :user_id, algorithm: :concurrently
+    add_index :web_push_subscriptions, :access_token_id, algorithm: :concurrently
+  end
+
+  def down
+    remove_index :web_push_subscriptions, :user_id
+    remove_index :web_push_subscriptions, :access_token_id
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2018_05_06_221944) do
+ActiveRecord::Schema.define(version: 2018_05_10_230049) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -539,6 +539,10 @@ ActiveRecord::Schema.define(version: 2018_05_06_221944) do
     t.json "data"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.bigint "access_token_id"
+    t.bigint "user_id"
+    t.index ["access_token_id"], name: "index_web_push_subscriptions_on_access_token_id"
+    t.index ["user_id"], name: "index_web_push_subscriptions_on_user_id"
   end
 
   create_table "web_settings", force: :cascade do |t|
@@ -605,5 +609,7 @@ ActiveRecord::Schema.define(version: 2018_05_06_221944) do
   add_foreign_key "subscriptions", "accounts", name: "fk_9847d1cbb5", on_delete: :cascade
   add_foreign_key "users", "accounts", name: "fk_50500f500d", on_delete: :cascade
   add_foreign_key "users", "invites", on_delete: :nullify
+  add_foreign_key "web_push_subscriptions", "oauth_access_tokens", column: "access_token_id", on_delete: :cascade
+  add_foreign_key "web_push_subscriptions", "users", on_delete: :cascade
   add_foreign_key "web_settings", "users", name: "fk_11910667b2", on_delete: :cascade
 end

spec/controllers/api/v1/push/subscriptions_controller_spec.rb

@@ -0,0 +1,83 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe Api::V1::Push::SubscriptionsController do
+  render_views
+
+  let(:user)  { Fabricate(:user) }
+  let(:token) { Fabricate(:accessible_access_token, resource_owner_id: user.id, scopes: 'push') }
+
+  before do
+    allow(controller).to receive(:doorkeeper_token) { token }
+  end
+
+  let(:create_payload) do
+    {
+      subscription: {
+        endpoint: 'https://fcm.googleapis.com/fcm/send/fiuH06a27qE:APA91bHnSiGcLwdaxdyqVXNDR9w1NlztsHb6lyt5WDKOC_Z_Q8BlFxQoR8tWFSXUIDdkyw0EdvxTu63iqamSaqVSevW5LfoFwojws8XYDXv_NRRLH6vo2CdgiN4jgHv5VLt2A8ah6lUX',
+        keys: {
+          p256dh: 'BEm_a0bdPDhf0SOsrnB2-ategf1hHoCnpXgQsFj5JCkcoMrMt2WHoPfEYOYPzOIs9mZE8ZUaD7VA5vouy0kEkr8=',
+          auth: 'eH_C8rq2raXqlcBVDa1gLg==',
+        },
+      }
+    }.with_indifferent_access
+  end
+
+  let(:alerts_payload) do
+    {
+      data: {
+        alerts: {
+          follow: true,
+          favourite: false,
+          reblog: true,
+          mention: false,
+        }
+      }
+    }.with_indifferent_access
+  end
+
+  describe 'POST #create' do
+    it 'saves push subscriptions' do
+      post :create, params: create_payload
+
+      push_subscription = Web::PushSubscription.find_by(endpoint: create_payload[:subscription][:endpoint])
+
+      expect(push_subscription.endpoint).to eq(create_payload[:subscription][:endpoint])
+      expect(push_subscription.key_p256dh).to eq(create_payload[:subscription][:keys][:p256dh])
+      expect(push_subscription.key_auth).to eq(create_payload[:subscription][:keys][:auth])
+      expect(push_subscription.user_id).to eq user.id
+      expect(push_subscription.access_token_id).to eq token.id
+    end
+
+    it 'replaces old subscription on repeat calls' do
+      post :create, params: create_payload
+      post :create, params: create_payload
+
+      expect(Web::PushSubscription.where(endpoint: create_payload[:subscription][:endpoint]).count).to eq 1
+    end
+  end
+
+  describe 'PUT #update' do
+    it 'changes alert settings' do
+      post :create, params: create_payload
+      put :update, params: alerts_payload
+
+      push_subscription = Web::PushSubscription.find_by(endpoint: create_payload[:subscription][:endpoint])
+
+      expect(push_subscription.data.dig('alerts', 'follow')).to eq(alerts_payload[:data][:alerts][:follow].to_s)
+      expect(push_subscription.data.dig('alerts', 'favourite')).to eq(alerts_payload[:data][:alerts][:favourite].to_s)
+      expect(push_subscription.data.dig('alerts', 'reblog')).to eq(alerts_payload[:data][:alerts][:reblog].to_s)
+      expect(push_subscription.data.dig('alerts', 'mention')).to eq(alerts_payload[:data][:alerts][:mention].to_s)
+    end
+  end
+
+  describe 'DELETE #destroy' do
+    it 'removes the subscription' do
+      post :create, params: create_payload
+      delete :destroy
+
+      expect(Web::PushSubscription.find_by(endpoint: create_payload[:subscription][:endpoint])).to be_nil
+    end
+  end
+end

spec/controllers/api/web/push_subscriptions_controller_spec.rb

@@ -59,10 +59,10 @@ describe Api::Web::PushSubscriptionsController do
 
         push_subscription = Web::PushSubscription.find_by(endpoint: create_payload[:subscription][:endpoint])
 
-        expect(push_subscription.data['follow']).to eq(alerts_payload[:data][:follow])
-        expect(push_subscription.data['favourite']).to eq(alerts_payload[:data][:favourite])
-        expect(push_subscription.data['reblog']).to eq(alerts_payload[:data][:reblog])
-        expect(push_subscription.data['mention']).to eq(alerts_payload[:data][:mention])
+        expect(push_subscription.data['alerts']['follow']).to eq(alerts_payload[:data][:alerts][:follow].to_s)
+        expect(push_subscription.data['alerts']['favourite']).to eq(alerts_payload[:data][:alerts][:favourite].to_s)
+        expect(push_subscription.data['alerts']['reblog']).to eq(alerts_payload[:data][:alerts][:reblog].to_s)
+        expect(push_subscription.data['alerts']['mention']).to eq(alerts_payload[:data][:alerts][:mention].to_s)
       end
     end
   end
@@ -81,10 +81,10 @@ describe Api::Web::PushSubscriptionsController do
 
       push_subscription = Web::PushSubscription.find_by(endpoint: create_payload[:subscription][:endpoint])
 
-      expect(push_subscription.data['follow']).to eq(alerts_payload[:data][:follow])
-      expect(push_subscription.data['favourite']).to eq(alerts_payload[:data][:favourite])
-      expect(push_subscription.data['reblog']).to eq(alerts_payload[:data][:reblog])
-      expect(push_subscription.data['mention']).to eq(alerts_payload[:data][:mention])
+      expect(push_subscription.data['alerts']['follow']).to eq(alerts_payload[:data][:alerts][:follow].to_s)
+      expect(push_subscription.data['alerts']['favourite']).to eq(alerts_payload[:data][:alerts][:favourite].to_s)
+      expect(push_subscription.data['alerts']['reblog']).to eq(alerts_payload[:data][:alerts][:reblog].to_s)
+      expect(push_subscription.data['alerts']['mention']).to eq(alerts_payload[:data][:alerts][:mention].to_s)
     end
   end
 end

spec/models/web/push_subscription_spec.rb

@@ -2,20 +2,8 @@ require 'rails_helper'
 
 RSpec.describe Web::PushSubscription, type: :model do
   let(:alerts) { { mention: true, reblog: false, follow: true, follow_request: false, favourite: true } }
-  let(:payload_no_alerts) { Web::PushSubscription.new(id: 1, endpoint: 'a', key_p256dh: 'c', key_auth: 'd').as_payload }
-  let(:payload_alerts) { Web::PushSubscription.new(id: 1, endpoint: 'a', key_p256dh: 'c', key_auth: 'd', data: { alerts: alerts }).as_payload }
   let(:push_subscription) { Web::PushSubscription.new(data: { alerts: alerts }) }
 
-  describe '#as_payload' do
-    it 'only returns id and endpoint' do
-      expect(payload_no_alerts.keys).to eq [:id, :endpoint]
-    end
-
-    it 'returns alerts if set' do
-      expect(payload_alerts.keys).to eq [:id, :endpoint, :alerts]
-    end
-  end
-
   describe '#pushable?' do
     it 'obeys alert settings' do
       expect(push_subscription.send(:pushable?, Notification.new(activity_type: 'Mention'))).to eq true