add conference options to the broadcasts; implement auth to microsoft

app/controllers/conference_meetings_controller.rb

@@ -0,0 +1,45 @@
+class ConferenceMeetingsController < ApplicationController
+  require 'microsoft_graph'
+
+  def show
+    authorize broadcast = Broadcast.find(params[:broadcast_id])
+    case broadcast.conference_option
+    when 'zoom'
+      redirect_to broadcast.zoom_meeting_url
+    when 'ms_teams'
+      if broadcast.conference_join_url.nil?
+        begin
+          graph_api = MicrosoftGraph.new(
+              current_user,
+              ENV['AZURE_CLIENT_ID'],
+              ENV['AZURE_CLIENT_SECRET'],
+              ENV['AZURE_TENANT_ID'],
+              ENV['AZURE_SCOPES']
+          )
+
+          subject = "#{broadcast.name} Online Meeting"
+          teams_meeting = graph_api.create_teams_meeting(subject)
+          join_url = teams_meeting['joinUrl']
+
+          if join_url.present?
+            broadcast.conference_join_url = join_url
+            broadcast.save
+          else
+            raise StandardError, 'Failed to read teams meeting join URL'
+          end
+        rescue ActionController::InvalidAuthenticityToken => e
+          Rails.logger.error(e.message)
+          redirect_to project_broadcast_url(broadcast.project, broadcast), alert: t('.alerts.not_authenticated')
+          return
+        rescue StandardError => e
+          Rails.logger.error(e.message)
+          redirect_to project_broadcast_url(broadcast.project, broadcast), alert: t('.alerts.failed_to_join')
+          return
+        end
+      end
+      redirect_to broadcast.conference_join_url
+    else
+      redirect_to project_broadcast_url(broadcast.project, broadcast), alert: t('.alerts.unknown_conference_option')
+    end
+  end
+end