Lay the ground works to submit information to Akismet

- New concern `AkismetSubmittable` to allow issues and other `Spammable` models to be submitted to Akismet.
- New model `UserAgentDetail` to store information needed for Akismet.
- Services needed for their creation and tests.

app/models/concerns/akismet_submittable.rb

+module AkismetSubmittable
+  extend ActiveSupport::Concern
+
+  included do
+    has_one :user_agent_detail, as: :subject
+  end
+
+  def can_be_submitted?
+    if user_agent_detail
+      user_agent_detail.submittable?
+    else
+      false
+    end
+  end
+end

app/models/issue.rb

@@ -8,6 +8,7 @@ class Issue < ActiveRecord::Base
   include Taskable
   include Spammable
   include FasterCacheKeys
+  include AkismetSubmittable
 
   DueDateStruct = Struct.new(:title, :name).freeze
   NoDueDate     = DueDateStruct.new('No Due Date', '0').freeze

app/models/user_agent_detail.rb

+class UserAgentDetail < ActiveRecord::Base
+  belongs_to :subject, polymorphic: true
+
+  validates :user_agent,
+            presence: true
+  validates :ip_address,
+            presence: true
+  validates :subject_id,
+            presence: true
+  validates :subject_type,
+            presence: true
+
+  def submittable?
+    user_agent.present? && ip_address.present?
+  end
+end

app/services/issues/create_service.rb

@@ -15,6 +15,7 @@ module Issues
         notification_service.new_issue(issue, current_user)
         todo_service.new_issue(issue, current_user)
         event_service.open_issue(issue, current_user)
+        user_agent_detail_service(issue, request).create
         issue.create_cross_references!(current_user)
         execute_hooks(issue, 'open')
       end
@@ -27,5 +28,9 @@ module Issues
     def spam_check_service
       SpamCheckService.new(project, current_user, params)
     end
+
+    def user_agent_detail_service(issue, request)
+      UserAgentDetailService.new(issue, request)
+    end
   end
 end

app/services/user_agent_detail_service.rb

+class UserAgentDetailService
+  attr_accessor :subject, :request
+
+  def initialize(subject, request)
+    @subject, @request = subject, request
+  end
+
+  def create
+    return unless request
+    subject.create_user_agent_detail(user_agent: request.env['HTTP_USER_AGENT'], ip_address: request.env['action_dispatch.remote_ip'].to_s)
+  end
+end

db/migrate/20160727163552_create_user_agent_details.rb

+class CreateUserAgentDetails < ActiveRecord::Migration
+  def change
+    create_table :user_agent_details do |t|
+      t.string :user_agent, null: false
+      t.string :ip_address, null: false
+      t.integer :subject_id, null: false
+      t.string :subject_type, null: false
+
+      t.timestamps null: false
+    end
+  end
+end

db/schema.rb

@@ -999,6 +999,15 @@ ActiveRecord::Schema.define(version: 20160810142633) do
   add_index "u2f_registrations", ["key_handle"], name: "index_u2f_registrations_on_key_handle", using: :btree
   add_index "u2f_registrations", ["user_id"], name: "index_u2f_registrations_on_user_id", using: :btree
 
+  create_table "user_agent_details", force: :cascade do |t|
+    t.string   "user_agent",   null: false
+    t.string   "ip_address",   null: false
+    t.integer  "subject_id",   null: false
+    t.string   "subject_type", null: false
+    t.datetime "created_at",   null: false
+    t.datetime "updated_at",   null: false
+  end
+
   create_table "users", force: :cascade do |t|
     t.string   "email",                       default: "",    null: false
     t.string   "encrypted_password",          default: "",    null: false

spec/controllers/projects/issues_controller_spec.rb

@@ -300,6 +300,26 @@ describe Projects::IssuesController do
         expect(spam_logs[0].title).to eq('Spam Title')
       end
     end
+
+    context 'user agent details are saved' do
+      before do
+        request.env['action_dispatch.remote_ip'] = '127.0.0.1'
+      end
+
+      def post_new_issue
+        sign_in(user)
+        project = create(:empty_project, :public)
+        post :create, {
+          namespace_id: project.namespace.to_param,
+          project_id: project.to_param,
+          issue: { title: 'Title', description: 'Description' }
+        }
+      end
+
+      it 'creates a user agent detail' do
+        expect{ post_new_issue }.to change(UserAgentDetail, :count)
+      end
+    end
   end
 
   describe "DELETE #destroy" do

spec/factories/user_agent_details.rb

+FactoryGirl.define do
+  factory :user_agent_detail do
+    ip_address '127.0.0.1'
+    user_agent 'AppleWebKit/537.36'
+
+    trait :on_issue do
+      association :subject, factory: :issue
+    end
+  end
+end

spec/models/user_agent_detail_spec.rb

+require 'rails_helper'
+
+describe UserAgentDetail, type: :model do
+  describe '.submittable?' do
+    it 'should be submittable' do
+      detail = create(:user_agent_detail, :on_issue)
+      expect(detail.submittable?).to be_truthy
+    end
+  end
+
+  describe '.valid?' do
+    it 'should be valid with a subject' do
+      detail = create(:user_agent_detail, :on_issue)
+      expect(detail).to be_valid
+    end
+
+    it 'should not be valid without a subject' do
+      detail = build(:user_agent_detail)
+      expect(detail).not_to be_valid
+    end
+  end
+end