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/api/v1/accounts/microsoft/authorization_controller_spec.rb

@@ -0,0 +1,48 @@
+require 'rails_helper'
+
+RSpec.describe 'Microsoft Authorization API', type: :request do
+  let(:account) { create(:account) }
+
+  describe 'POST /api/v1/accounts/{account.id}/microsoft/authorization' do
+    context 'when it is an unauthenticated user' do
+      it 'returns unauthorized' do
+        post "/api/v1/accounts/#{account.id}/microsoft/authorization"
+
+        expect(response).to have_http_status(:unauthorized)
+      end
+    end
+
+    context 'when it is an authenticated user' do
+      let(:agent) { create(:user, account: account, role: :agent) }
+      let(:administrator) { create(:user, account: account, role: :administrator) }
+
+      it 'returns unathorized for agent' do
+        post "/api/v1/accounts/#{account.id}/microsoft/authorization",
+             headers: agent.create_new_auth_token,
+             params: { email: administrator.email },
+             as: :json
+
+        expect(response).to have_http_status(:unauthorized)
+      end
+
+      it 'creates a new authorization and returns the redirect url' do
+        post "/api/v1/accounts/#{account.id}/microsoft/authorization",
+             headers: administrator.create_new_auth_token,
+             params: { email: administrator.email },
+             as: :json
+
+        expect(response).to have_http_status(:success)
+        microsoft_service = Class.new { extend MicrosoftConcern }
+        response_url = microsoft_service.microsoft_client.auth_code.authorize_url(
+          {
+            redirect_uri: "#{ENV.fetch('FRONTEND_URL', 'http://localhost:3000')}/microsoft/callback",
+            scope: 'offline_access https://outlook.office.com/IMAP.AccessAsUser.All https://outlook.office.com/SMTP.Send openid',
+            prompt: 'consent'
+          }
+        )
+        expect(JSON.parse(response.body)['url']).to eq response_url
+        expect(::Redis::Alfred.get(administrator.email)).to eq(account.id.to_s)
+      end
+    end
+  end
+end