Add API for retrieving favourites

app/controllers/api/v1/favourites_controller.rb

+# frozen_string_literal: true
+
+class Api::V1::FavouritesController < ApiController
+  before_action -> { doorkeeper_authorize! :read }
+  before_action :require_user!
+
+  respond_to :json
+
+  def index
+    results   = Favourite.where(account: current_account).paginate_by_max_id(DEFAULT_STATUSES_LIMIT, params[:max_id], params[:since_id])
+    @statuses = cache_collection(Status.where(id: results.map(&:status_id)), Status)
+
+    set_maps(@statuses)
+    set_counters_maps(@statuses)
+
+    next_path = api_v1_favourites_url(max_id: results.last.id)    if results.size == DEFAULT_ACCOUNTS_LIMIT
+    prev_path = api_v1_favourites_url(since_id: results.first.id) unless results.empty?
+
+    set_pagination_headers(next_path, prev_path)
+  end
+end

app/services/favourite_service.rb

@@ -6,12 +6,14 @@ class FavouriteService < BaseService
   # @param [Status] status
   # @return [Favourite]
   def call(account, status)
+    raise Mastodon::NotPermitted unless status.permitted?(account)
+
     favourite = Favourite.create!(account: account, status: status)
 
     Pubsubhubbub::DistributionWorker.perform_async(favourite.stream_entry.id)
 
     if status.local?
-      NotifyService.new.call(status.account, favourite)
+      NotifyService.new.call(favourite.status.account, favourite)
     else
       NotificationWorker.perform_async(favourite.stream_entry.id, status.account_id)
     end

app/views/api/v1/favourites/index.rabl

+collection @statuses
+extends 'api/v1/statuses/show'

config/routes.rb

@@ -110,6 +110,7 @@ Rails.application.routes.draw do
       end
 
       resources :notifications, only: [:index]
+      resources :favourites,    only: [:index]
 
       resources :accounts, only: [:show] do
         collection do

spec/controllers/api/v1/favourites_controller_spec.rb

+require 'rails_helper'
+
+RSpec.describe Api::V1::FavouritesController, type: :controller do
+  render_views
+
+  let(:user)  { Fabricate(:user, account: Fabricate(:account, username: 'alice')) }
+  let(:token) { double acceptable?: true, resource_owner_id: user.id }
+
+  before do
+    allow(controller).to receive(:doorkeeper_token) { token }
+  end
+
+  describe 'GET #index' do
+    it 'returns http success' do
+      get :index
+      expect(response).to have_http_status(:success)
+    end
+  end
+end