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/controllers/microsoft/callbacks_controller_spec.rb

@@ -0,0 +1,67 @@
+require 'rails_helper'
+
+RSpec.describe 'Microsoft::CallbacksController', type: :request do
+  let(:account) { create(:account) }
+  let(:code) { SecureRandom.hex(10) }
+  let(:email) { Faker::Internet.email }
+
+  before do
+    Redis::Alfred.set(email, account.id)
+  end
+
+  describe 'GET /microsoft/callback' do
+    let(:response_body_success) do
+      { id_token: JWT.encode({ email: email, name: 'test' }, false), access_token: SecureRandom.hex(10), token_type: 'Bearer',
+        refresh_token: SecureRandom.hex(10) }
+    end
+
+    it 'creates inboxes if authentication is successful' do
+      stub_request(:post, 'https://login.microsoftonline.com/common/oauth2/v2.0/token')
+        .with(body: { 'code' => code, 'grant_type' => 'authorization_code',
+                      'redirect_uri' => "#{ENV.fetch('FRONTEND_URL', 'http://localhost:3000')}/microsoft/callback" })
+        .to_return(status: 200, body: response_body_success.to_json, headers: { 'Content-Type' => 'application/json' })
+
+      get microsoft_callback_url, params: { code: code }
+
+      expect(response).to redirect_to app_microsoft_inbox_agents_url(account_id: account.id, inbox_id: account.inboxes.last.id)
+      expect(account.inboxes.count).to be 1
+      inbox = account.inboxes.last
+      expect(inbox.name).to eq 'test'
+      expect(inbox.channel.reload.provider_config.keys).to include('access_token', 'refresh_token', 'expires_on')
+      expect(inbox.channel.reload.provider_config['access_token']).to eq response_body_success[:access_token]
+      expect(inbox.channel.imap_address).to eq 'outlook.office365.com'
+      expect(Redis::Alfred.get(email)).to be_nil
+    end
+
+    it 'creates updates inbox channel config if inbox exists and authentication is successful' do
+      inbox = create(:channel_email, account: account, email: email)&.inbox
+      expect(inbox.channel.provider_config).to eq({})
+
+      stub_request(:post, 'https://login.microsoftonline.com/common/oauth2/v2.0/token')
+        .with(body: { 'code' => code, 'grant_type' => 'authorization_code',
+                      'redirect_uri' => "#{ENV.fetch('FRONTEND_URL', 'http://localhost:3000')}/microsoft/callback" })
+        .to_return(status: 200, body: response_body_success.to_json, headers: { 'Content-Type' => 'application/json' })
+
+      get microsoft_callback_url, params: { code: code }
+
+      expect(response).to redirect_to app_microsoft_inbox_agents_url(account_id: account.id, inbox_id: account.inboxes.last.id)
+      expect(account.inboxes.count).to be 1
+      expect(inbox.channel.reload.provider_config.keys).to include('access_token', 'refresh_token', 'expires_on')
+      expect(inbox.channel.reload.provider_config['access_token']).to eq response_body_success[:access_token]
+      expect(inbox.channel.imap_address).to eq 'outlook.office365.com'
+      expect(Redis::Alfred.get(email)).to be_nil
+    end
+
+    it 'redirects to microsoft app in case of error' do
+      stub_request(:post, 'https://login.microsoftonline.com/common/oauth2/v2.0/token')
+        .with(body: { 'code' => code, 'grant_type' => 'authorization_code',
+                      'redirect_uri' => "#{ENV.fetch('FRONTEND_URL', 'http://localhost:3000')}/microsoft/callback" })
+        .to_return(status: 401)
+
+      get microsoft_callback_url, params: { code: code }
+
+      expect(response).to redirect_to '/'
+      expect(Redis::Alfred.get(email).to_i).to eq account.id
+    end
+  end
+end