Add /api/v1/admin/domain_allows (#18668)

- `GET /api/v1/admin/domain_allows` lists allowed domains
- `GET /api/v1/admin/domain_allows/:id` shows one by ID
- `DELETE /api/v1/admin/domain_allows/:id` deletes a given domain from the list
  of allowed domains
- `POST /api/v1/admin/domain_allows` to allow a new domain:
  if that domain is already allowed, the existing DomainAllow will be returned

app/controllers/api/v1/admin/domain_allows_controller.rb

@@ -0,0 +1,95 @@
+# frozen_string_literal: true
+
+class Api::V1::Admin::DomainAllowsController < Api::BaseController
+  include Authorization
+  include AccountableConcern
+
+  LIMIT = 100
+
+  before_action -> { authorize_if_got_token! :'admin:read', :'admin:read:domain_allows' }, only: [:index, :show]
+  before_action -> { authorize_if_got_token! :'admin:write', :'admin:write:domain_allows' }, except: [:index, :show]
+  before_action :require_staff!
+  before_action :set_domain_allows, only: :index
+  before_action :set_domain_allow, only: [:show, :destroy]
+
+  after_action :insert_pagination_headers, only: :index
+
+  PAGINATION_PARAMS = %i(limit).freeze
+
+  def create
+    authorize :domain_allow, :create?
+
+    @domain_allow = DomainAllow.find_by(resource_params)
+
+    if @domain_allow.nil?
+      @domain_allow = DomainAllow.create!(resource_params)
+      log_action :create, @domain_allow
+    end
+
+    render json: @domain_allow, serializer: REST::Admin::DomainAllowSerializer
+  end
+
+  def index
+    authorize :domain_allow, :index?
+    render json: @domain_allows, each_serializer: REST::Admin::DomainAllowSerializer
+  end
+
+  def show
+    authorize @domain_allow, :show?
+    render json: @domain_allow, serializer: REST::Admin::DomainAllowSerializer
+  end
+
+  def destroy
+    authorize @domain_allow, :destroy?
+    UnallowDomainService.new.call(@domain_allow)
+    log_action :destroy, @domain_allow
+    render json: @domain_allow, serializer: REST::Admin::DomainAllowSerializer
+  end
+
+  private
+
+  def set_domain_allows
+    @domain_allows = filtered_domain_allows.order(id: :desc).to_a_paginated_by_id(limit_param(LIMIT), params_slice(:max_id, :since_id, :min_id))
+  end
+
+  def set_domain_allow
+    @domain_allow = DomainAllow.find(params[:id])
+  end
+
+  def filtered_domain_allows
+    # TODO: no filtering yet
+    DomainAllow.all
+  end
+
+  def insert_pagination_headers
+    set_pagination_headers(next_path, prev_path)
+  end
+
+  def next_path
+    api_v1_admin_domain_allows_url(pagination_params(max_id: pagination_max_id)) if records_continue?
+  end
+
+  def prev_path
+    api_v1_admin_domain_allows_url(pagination_params(min_id: pagination_since_id)) unless @domain_allows.empty?
+  end
+
+  def pagination_max_id
+    @domain_allows.last.id
+  end
+
+  def pagination_since_id
+    @domain_allows.first.id
+  end
+
+  def records_continue?
+    @domain_allows.size == limit_param(LIMIT)
+  end
+
+  def pagination_params(core_params)
+    params.slice(*PAGINATION_PARAMS).permit(*PAGINATION_PARAMS).merge(core_params)
+  end
+
+  def resource_params
+    params.permit(:domain)
+  end
+end

app/models/domain_allow.rb

@@ -11,6 +11,7 @@
 #
 
 class DomainAllow < ApplicationRecord
+  include Paginable
   include DomainNormalizable
   include DomainMaterializable
 

app/policies/domain_allow_policy.rb

@@ -1,6 +1,14 @@
 # frozen_string_literal: true
 
 class DomainAllowPolicy < ApplicationPolicy
+  def index?
+    admin?
+  end
+
+  def show?
+    admin?
+  end
+
   def create?
     admin?
   end

app/serializers/rest/admin/domain_allow_serializer.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class REST::Admin::DomainAllowSerializer < ActiveModel::Serializer
+  attributes :id, :domain, :created_at
+
+  def id
+    object.id.to_s
+  end
+end

config/routes.rb

@@ -570,6 +570,7 @@ Rails.application.routes.draw do
           end
         end
 
+        resources :domain_allows, only: [:index, :show, :create, :destroy]
         resources :domain_blocks, only: [:index, :show, :update, :create, :destroy]
 
         namespace :trends do

spec/controllers/api/v1/admin/domain_allows_controller_spec.rb

@@ -0,0 +1,118 @@
+require 'rails_helper'
+
+RSpec.describe Api::V1::Admin::DomainAllowsController, type: :controller do
+  render_views
+
+  let(:role)   { 'admin' }
+  let(:user)   { Fabricate(:user, role: role) }
+  let(:scopes) { 'admin:read admin:write' }
+  let(:token)  { Fabricate(:accessible_access_token, resource_owner_id: user.id, scopes: scopes) }
+
+  before do
+    allow(controller).to receive(:doorkeeper_token) { token }
+  end
+
+  shared_examples 'forbidden for wrong scope' do |wrong_scope|
+    let(:scopes) { wrong_scope }
+
+    it 'returns http forbidden' do
+      expect(response).to have_http_status(403)
+    end
+  end
+
+  shared_examples 'forbidden for wrong role' do |wrong_role|
+    let(:role) { wrong_role }
+
+    it 'returns http forbidden' do
+      expect(response).to have_http_status(403)
+    end
+  end
+
+  describe 'GET #index' do
+    let!(:domain_allow) { Fabricate(:domain_allow) }
+
+    before do
+      get :index
+    end
+
+    it_behaves_like 'forbidden for wrong scope', 'write:statuses'
+    it_behaves_like 'forbidden for wrong role', 'user'
+    it_behaves_like 'forbidden for wrong role', 'moderator'
+
+    it 'returns http success' do
+      expect(response).to have_http_status(200)
+    end
+
+    it 'returns the expected domain allows' do
+      json = body_as_json
+      expect(json.length).to eq 1
+      expect(json[0][:id].to_i).to eq domain_allow.id
+    end
+  end
+
+  describe 'GET #show' do
+    let!(:domain_allow) { Fabricate(:domain_allow) }
+
+    before do
+      get :show, params: { id: domain_allow.id }
+    end
+
+    it_behaves_like 'forbidden for wrong scope', 'write:statuses'
+    it_behaves_like 'forbidden for wrong role', 'user'
+    it_behaves_like 'forbidden for wrong role', 'moderator'
+
+    it 'returns http success' do
+      expect(response).to have_http_status(200)
+    end
+
+    it 'returns expected domain name' do
+      json = body_as_json
+      expect(json[:domain]).to eq domain_allow.domain
+    end
+  end
+
+  describe 'DELETE #destroy' do
+    let!(:domain_allow) { Fabricate(:domain_allow) }
+
+    before do
+      delete :destroy, params: { id: domain_allow.id }
+    end
+
+    it_behaves_like 'forbidden for wrong scope', 'write:statuses'
+    it_behaves_like 'forbidden for wrong role', 'user'
+    it_behaves_like 'forbidden for wrong role', 'moderator'
+
+    it 'returns http success' do
+      expect(response).to have_http_status(200)
+    end
+
+    it 'deletes the block' do
+      expect(DomainAllow.find_by(id: domain_allow.id)).to be_nil
+    end
+  end
+
+  describe 'POST #create' do
+    let!(:domain_allow) { Fabricate(:domain_allow, domain: 'example.com') }
+
+    before do
+      post :create, params: { domain: 'foo.bar.com' }
+    end
+
+    it_behaves_like 'forbidden for wrong scope', 'write:statuses'
+    it_behaves_like 'forbidden for wrong role', 'user'
+    it_behaves_like 'forbidden for wrong role', 'moderator'
+
+    it 'returns http success' do
+      expect(response).to have_http_status(200)
+    end
+
+    it 'returns expected domain name' do
+      json = body_as_json
+      expect(json[:domain]).to eq 'foo.bar.com'
+    end
+
+    it 'creates a domain block' do
+      expect(DomainAllow.find_by(domain: 'foo.bar.com')).to_not be_nil
+    end
+  end
+end