Feat: Support for Microsoft Oauth in Email Channel (#6227)

- Adds the backend APIs required for Microsoft Email Channels

Co-authored-by: Pranav Raj S <pranav@chatwoot.com>
Co-authored-by: Sojan <sojan@pepalo.com>

spec/jobs/inboxes/fetch_imap_emails_job_spec.rb

@@ -1,12 +1,21 @@
 require 'rails_helper'
 
 RSpec.describe Inboxes::FetchImapEmailsJob, type: :job do
+  include ActionMailbox::TestHelper
+
   let(:account) { create(:account) }
   let(:imap_email_channel) do
     create(:channel_email, imap_enabled: true, imap_address: 'imap.gmail.com', imap_port: 993, imap_login: 'imap@gmail.com',
                            imap_password: 'password', imap_inbox_synced_at: Time.now.utc, account: account)
   end
+  let(:microsoft_imap_email_channel) do
+    create(:channel_email, provider: 'microsoft', imap_enabled: true, imap_address: 'outlook.office365.com',
+                           imap_port: 993, imap_login: 'imap@outlook.com', imap_password: 'password', account: account,
+                           provider_config: { access_token: 'access_token' })
+  end
+  let(:ms_email_inbox) { create(:inbox, channel: microsoft_imap_email_channel, account: account) }
   let!(:conversation) { create(:conversation, inbox: imap_email_channel.inbox, account: account) }
+  let(:inbound_mail) { create_inbound_email_from_mail(from: 'testemail@gmail.com', to: 'imap@outlook.com', subject: 'Hello!') }
 
   it 'enqueues the job' do
     expect { described_class.perform_later }.to have_enqueued_job(described_class)
@@ -31,6 +40,35 @@ RSpec.describe Inboxes::FetchImapEmailsJob, type: :job do
     end
   end
 
+  context 'when imap fetch new emails for microsoft mailer' do
+    it 'fetch and process all emails' do
+      email = Mail.new do
+        to 'test@outlook.com'
+        from 'test@gmail.com'
+        subject :test.to_s
+        body 'hello'
+      end
+      imap_fetch_mail = Net::IMAP::FetchData.new
+      imap_fetch_mail.attr = { RFC822: email }.with_indifferent_access
+
+      ms_imap = double
+
+      allow(Net::IMAP).to receive(:new).and_return(ms_imap)
+      allow(ms_imap).to receive(:authenticate)
+      allow(ms_imap).to receive(:select)
+      allow(ms_imap).to receive(:search).and_return([1])
+      allow(ms_imap).to receive(:fetch).and_return([imap_fetch_mail])
+      allow(Mail).to receive(:read_from_string).and_return(inbound_mail)
+
+      ms_imap_email_inbox = double
+
+      allow(Imap::ImapMailbox).to receive(:new).and_return(ms_imap_email_inbox)
+      expect(ms_imap_email_inbox).to receive(:process).with(inbound_mail, microsoft_imap_email_channel).once
+
+      described_class.perform_now(microsoft_imap_email_channel)
+    end
+  end
+
   context 'when imap fetch existing emails' do
     it 'does not process the email' do
       email = Mail.new do