feat(CW-6187): include headers from incoming emails (#13139)

spec/mailboxes/reply_mailbox_spec.rb

@@ -12,8 +12,8 @@ RSpec.describe ReplyMailbox do
     let(:conversation) { create(:conversation, assignee: agent, inbox: create(:inbox, account: account, greeting_enabled: false), account: account) }
     let(:described_subject) { described_class.receive reply_mail }
     let(:serialized_attributes) do
-      %w[bcc cc content_type date from html_content in_reply_to message_id multipart number_of_attachments references subject text_content to
-         auto_reply]
+      %w[bcc cc content_type date from headers html_content in_reply_to message_id multipart number_of_attachments references subject text_content
+         to auto_reply]
     end
 
     context 'with reply uuid present' do
@@ -397,7 +397,7 @@ RSpec.describe ReplyMailbox do
     let(:support_in_reply_to_mail) { create_inbound_email_from_fixture('support_in_reply_to.eml') }
     let(:described_subject) { described_class.receive support_mail }
     let(:serialized_attributes) do
-      %w[bcc cc content_type date from html_content in_reply_to message_id multipart number_of_attachments references subject
+      %w[bcc cc content_type date from headers html_content in_reply_to message_id multipart number_of_attachments references subject
          text_content to auto_reply]
     end
     let(:conversation) { Conversation.where(inbox_id: channel_email.inbox).last }

spec/presenters/mail_presenter_spec.rb

@@ -41,6 +41,7 @@ RSpec.describe MailPresenter do
                                 :content_type,
                                 :date,
                                 :from,
+                                :headers,
                                 :html_content,
                                 :in_reply_to,
                                 :message_id,
@@ -60,6 +61,39 @@ RSpec.describe MailPresenter do
       expect(data[:auto_reply]).to eq(decorated_mail.auto_reply?)
     end
 
+    it 'includes forwarded headers in serialized_data' do
+      mail_with_headers = Mail.new do
+        from 'Sender <sender@example.com>'
+        to 'Inbox <inbox@example.com>'
+        subject :header
+        body 'Hi'
+        header['X-Original-From'] = 'Original <original@example.com>'
+        header['X-Original-Sender'] = 'original@example.com'
+        header['X-Forwarded-For'] = 'forwarder@example.com'
+      end
+
+      data = described_class.new(mail_with_headers).serialized_data
+
+      expect(data[:headers]).to eq(
+        'x-original-from' => 'Original <original@example.com>',
+        'x-original-sender' => 'original@example.com',
+        'x-forwarded-for' => 'forwarder@example.com'
+      )
+    end
+
+    it 'returns nil headers when forwarding headers are missing' do
+      mail_without_headers = Mail.new do
+        from 'Sender <sender@example.com>'
+        to 'Inbox <inbox@example.com>'
+        subject :header
+        body 'Hi'
+      end
+
+      data = described_class.new(mail_without_headers).serialized_data
+
+      expect(data[:headers]).to be_nil
+    end
+
     it 'give email from in downcased format' do
       expect(decorated_mail.from.first.eql?(mail.from.first.downcase)).to be true
     end