Feature: Conversation Continuity with Email (#770)

* Added POC for mail inbox reply email
* created mailbox and migratuion for the same
* cleaned up sidekiq queues and added the queues for action mailbox and active storage
* created conversation mailbox and functionlaity to create a message on the conversation when it's replied

* Added UUID to conversation to be used in email replies

* added migration to add uuid for conversation
* changed parsing and resource fetching to reflect matching uuid and
  loading conversation alone
* cleaned up conversation mailbox.rb

* Added content type & attribute for message

* Added the new reply email to outgoing emails
* Added migration to accounts for adding domain and settings
* Modified seeds to reflect this changes
* Added the flag based column on account for boolean settings
* Added the new reply to email in outgoing conversation emails based on conditions

* Added dynamic email routing in application mailbox
* Added dynamic email routing in application mailbox
* Added a catch all deafult empty mailbox
* Added annotation for account

* Added the complete email details & attachments to the message
* Added the complete email details to the message in content_attributes, like subject, to, cc, bcc etc
* Modified the mail extractor to give a serilaized version of email
* Handled storing attachments of email on the message

* Added incoming email settings, env variables

* [#138] Added documentation regarding different email settings and variables

* Fixed the mail attachments blob issue (#138)
* Decoided attachments were strings and had to construct blobs out fo them to work with active storage
* Fixed the content encoding issue with mail body
* Fixed issue with Proc used in apllication mailbox routing
* Fixed couple of typos and silly mistakes

* Set appropriate from email for conversation reply mails (#138)
* From email was taken from a env variable, changed it to take from account settings if enabled
* Set the reply to email correctly based on conversation UUID
* Added commented config ind development.rb for mailbox ingress

* Added account settings for domain and support email (#138)
* Added the new attributes in accounts controller params whitelisting, api responses
* Added options for the the new fields in account settings

* Fixed typos in email continuity docs and warnings

* Added specs for conversation reply mailer changes (#138)
* Added specs for
  * conversation reply mailer
  * Accounts controller
  * Account and Conversation models

* Added tests for email presenter (#138)

* Specs for inbound email routing and mailboxes (#138)

spec/mailboxes/application_mailbox_spec.rb

@@ -0,0 +1,24 @@
+require 'rails_helper'
+
+RSpec.describe ApplicationMailbox, type: :mailbox do
+  include ActionMailbox::TestHelper
+
+  describe 'route the inbound mail to appropriate mailbox' do
+    let(:welcome_mail) { create_inbound_email_from_fixture('welcome.eml') }
+    let(:reply_mail) { create_inbound_email_from_fixture('reply.eml') }
+
+    it 'catchall mails route to default inbox' do
+      dbl = double
+      expect(DefaultMailbox).to receive(:new).and_return(dbl)
+      expect(dbl).to receive(:perform_processing).and_return(true)
+      described_class.route welcome_mail
+    end
+
+    it 'routes reply emails to Conversation Mailbox' do
+      dbl = double
+      expect(ConversationMailbox).to receive(:new).and_return(dbl)
+      expect(dbl).to receive(:perform_processing).and_return(true)
+      described_class.route reply_mail
+    end
+  end
+end

spec/mailboxes/conversation_mailbox_spec.rb

@@ -0,0 +1,37 @@
+require 'rails_helper'
+
+RSpec.describe ConversationMailbox, type: :mailbox do
+  include ActionMailbox::TestHelper
+
+  describe 'add mail as reply in a conversation' do
+    let(:agent) { create(:user, email: 'agent1@example.com') }
+    let(:reply_mail) { create_inbound_email_from_fixture('reply.eml') }
+    let(:conversation) { create(:conversation, assignee: agent) }
+    let(:described_subject) { described_class.receive reply_mail }
+    let(:serialized_attributes) { %w[content number_of_attachments subject date to from in_reply_to cc bcc message_id] }
+
+    before do
+      # this UUID is hardcoded in the reply.eml, that's why we are updating this
+      conversation.uuid = '6bdc3f4d-0bec-4515-a284-5d916fdde489'
+      conversation.save
+
+      described_subject
+    end
+
+    it 'add the mail content as new message on the conversation' do
+      expect(conversation.messages.last.content).to eq("Let's talk about these images:\r\n\r\n")
+    end
+
+    it 'add the attachments' do
+      expect(conversation.messages.last.attachments.count).to eq(2)
+    end
+
+    it 'have proper content_attributes with details of email' do
+      expect(conversation.messages.last.content_attributes[:email].keys).to eq(serialized_attributes)
+    end
+
+    it 'set proper content_type' do
+      expect(conversation.messages.last.content_type).to eq('incoming_email')
+    end
+  end
+end

spec/mailboxes/default_mailbox_spec.rb

@@ -0,0 +1,5 @@
+require 'rails_helper'
+
+RSpec.describe DefaultMailbox, type: :mailbox do
+  pending "add some examples to (or delete) #{__FILE__}"
+end