allow selecting conference option

app/controllers/conference_meetings_controller.rb

@@ -0,0 +1,42 @@
+class ConferenceMeetingsController < ApplicationController
+  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: 'You are not authenticated via Microsoft, please authenticate and try again'
+          return
+        rescue StandardError => e
+          Rails.logger.error(e.message)
+          redirect_to project_broadcast_url(broadcast.project, broadcast), alert: 'Failed to join conference'
+          return
+        end
+      end
+      redirect_to broadcast.conference_join_url
+    else
+      redirect_to project_broadcast_url(broadcast.project, broadcast), alert: 'Unknown conference option'
+    end
+  end
+end