Add option for storing Azure app configs in settings using JSON format [SCI-4544]

app/models/application_settings.rb

@@ -0,0 +1,4 @@
+# frozen_string_literal: true
+
+class ApplicationSettings < Settings
+end

config/initializers/azure_ad.rb

@@ -34,4 +34,39 @@ Rails.application.configure do
       config.x.azure_ad_apps[value][:sign_in_policy] = ENV["#{app_name}_AZURE_AD_SIGN_IN_POLICY"]
     end
   end
+
+  # Checking additional configurations in ApplicationSettings JSON. Key and values should be strings there.
+  begin
+    if ApplicationSettings.instance.values['azure_ad_apps']&.is_a?(Array)
+      config.x.azure_ad_apps ||= HashWithIndifferentAccess.new
+      settings = ApplicationSettings.instance
+
+      settings.values['azure_ad_apps'].each do |azure_ad_app|
+        app_config = {}
+        app_id = azure_ad_app['app_id']
+        Rails.logger.error('No app_id present for the entry in Azure app settings') && next unless app_id
+
+        app_config[:iss] = azure_ad_app['iss']
+        Rails.logger.error("No iss for #{app_id} Azure app") && next unless app_config[:iss]
+
+        app_config[:conf_url] = azure_ad_app['conf_url']
+        Rails.logger.error("No conf_url for #{app_id} Azure app") && next unless app_config[:conf_url]
+
+        app_config[:provider] = azure_ad_app['provider_name']
+        Rails.logger.error("No provider_name for #{app_id} Azure app") && next unless app_config[:provider]
+
+        app_config[:enable_sign_in] = azure_ad_app['enable_sign_in'] == 'true'
+
+        if app_config[:enable_sign_in]
+          app_config[:sign_in_label] = azure_ad_app['sign_in_label'] || 'Sign in with Azure AD'
+          app_config[:auto_link_on_sign_in] = azure_ad_app['auto_link_on_sign_in'] == 'true'
+          app_config[:sign_in_policy] = azure_ad_app['sign_in_policy'] if azure_ad_app['sign_in_policy']
+        end
+
+        config.x.azure_ad_apps[app_id] = app_config
+      end
+    end
+  rescue ActiveRecord::ActiveRecordError
+    Rails.logger.info('Not connected to database, skipping additional Azure AD configuration')
+  end
 end