feat: bring back Microsoft Controller

I made a booboo, Microsoft concern was actually used in Microsoft::AuthorizationsController, which needed the OAuth client, let's bring it back

app/controllers/concerns/microsoft.rb

@@ -0,0 +1,21 @@
+module MicrosoftConcern
+  extend ActiveSupport::Concern
+
+  def microsoft_client
+    app_id = GlobalConfigService.load('AZURE_APP_ID', nil)
+    app_secret = GlobalConfigService.load('AZURE_APP_SECRET', nil)
+
+    ::OAuth2::Client.new(app_id, app_secret,
+                         {
+                           site: 'https://login.microsoftonline.com',
+                           authorize_url: 'https://login.microsoftonline.com/common/oauth2/v2.0/authorize',
+                           token_url: 'https://login.microsoftonline.com/common/oauth2/v2.0/token'
+                         })
+  end
+
+  private
+
+  def base_url
+    ENV.fetch('FRONTEND_URL', 'http://localhost:3000')
+  end
+end

app/controllers/microsoft/callbacks_controller.rb

@@ -1,6 +1,12 @@
 class Microsoft::CallbacksController < OauthCallbackController
+  include MicrosoftConcern
+
   private
 
+  def oauth_client
+    microsoft_client
+  end
+
   def provider_name
     'microsoft'
   end
@@ -8,16 +14,4 @@ class Microsoft::CallbacksController < OauthCallbackController
   def imap_address
     'outlook.office365.com'
   end
-
-  def oauth_client
-    app_id = GlobalConfigService.load('AZURE_APP_ID', nil)
-    app_secret = GlobalConfigService.load('AZURE_APP_SECRET', nil)
-
-    ::OAuth2::Client.new(app_id, app_secret,
-                         {
-                           site: 'https://login.microsoftonline.com',
-                           authorize_url: 'https://login.microsoftonline.com/common/oauth2/v2.0/authorize',
-                           token_url: 'https://login.microsoftonline.com/common/oauth2/v2.0/token'
-                         })
-  end
 end