Complete teams meeting creation and token refresh

app/controllers/broadcasts_controller.rb

@@ -1,4 +1,5 @@
 class BroadcastsController < ApplicationController
+  require 'microsoft_graph'
   layout "project"
 
   before_action :set_project
@@ -17,6 +18,25 @@ class BroadcastsController < ApplicationController
   def create
     @broadcast.attributes = broadcast_params
 
+    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']
+      @broadcast.microsoft_teams_meeting_url = join_url if join_url.present?
+    rescue StandardError => e
+      @broadcast.errors[:base] << e.message
+      render :new
+      return
+    end
+
     if @broadcast.save
       log_create_analytics
       redirect_to [@project, :broadcasts], notice: t(".notice")
@@ -27,7 +47,7 @@ class BroadcastsController < ApplicationController
 
   def show
     # @conference_url = url_for [@broadcast.project, @broadcast, :zoom_meeting]
-    @conference_url = url_for [@broadcast.project, @broadcast, :microsoft_teams_meeting]
+    @conference_url = @broadcast.microsoft_teams_meeting_url
     @recordings = @broadcast.broadcast_recordings.order_by_recent.paginate(page: params[:page])
     @files = @broadcast.files.order("created_at DESC").paginate(page: params[:files_page])
     render layout: 'application'

app/controllers/microsoft_teams_meetings_controller.rb

@@ -1,17 +0,0 @@
-class MicrosoftTeamsMeetingsController < ApplicationController
-  require 'microsoft_graph'
-  def show
-    authorize broadcast = Broadcast.find(params[:broadcast_id])
-
-    graph_api = MicrosoftGraph.new(current_user, ENV['AZURE_CLIENT_ID'], ENV['AZURE_CLIENT_SECRET'], ENV['AZURE_SCOPES'])
-
-    meeting_start = DateTime.now
-    meeting_end = DateTime.now + 1.hour
-    subject = "Broadcast Meeting"
-
-
-    r = graph_api.create_teams_meeting(meeting_start, meeting_end, subject)
-
-    render plain: r
-  end
-end

app/models/broadcast.rb

@@ -1,4 +1,5 @@
 class Broadcast < ApplicationRecord
+  require 'microsoft_graph'
   include PgSearch
 
   belongs_to :project

app/views/broadcasts/show.html.erb

@@ -119,7 +119,7 @@
               <hr>
             <% end %>
             <p class="card-text">If you want to join the ZOOM meeting dedicated to this broadcast, follow the link below.</p>
-            <%= link_to 'Video Conference', @conference_url, class: 'btn btn-primary btn-block', target: '_blank' %>
+            <%= link_to 'Video Conference', @conference_url, class: "btn btn-primary btn-block #{@conference_url.present? ? '' : 'disabled'}", target: '_blank' %>
           </div>
           <div class="<%= class_string("tab-pane fade show", "active" => params[:active_tab] == 'recordings') %>" id="recordings">
             <div id="broadcast_recordings">

config/routes.rb

@@ -102,7 +102,6 @@ Rails.application.routes.draw do
           delete :destroy_file
         end
         # resource :zoom_meeting, only: [:show]
-        resource :microsoft_teams_meeting, only: [:show]
       end
       resources :directories, except: [:index] do
         member do

db/migrate/20200817233053_add_microsoft_teams_meeting_join_url_to_broadcasts.rb

@@ -0,0 +1,5 @@
+class AddMicrosoftTeamsMeetingJoinUrlToBroadcasts < ActiveRecord::Migration[6.0]
+  def change
+    add_column :broadcasts, :microsoft_teams_meeting_url, :string
+  end
+end

db/structure.sql

@@ -562,7 +562,8 @@ CREATE TABLE public.broadcasts (
     token character varying,
     streamer_status integer DEFAULT 0,
     shoot_location_time_zone character varying DEFAULT 'UTC'::character varying,
-    full_live_stream_playback_uid character varying
+    full_live_stream_playback_uid character varying,
+    microsoft_teams_meeting_url character varying
 );
 
 
@@ -3972,6 +3973,7 @@ INSERT INTO "schema_migrations" (version) VALUES
 ('20200721140821'),
 ('20200725231419'),
 ('20200810140331'),
-('20200812161119');
+('20200812161119'),
+('20200817233053');
 
 

lib/microsoft_graph.rb

@@ -2,49 +2,29 @@ require 'httparty'
 
 class MicrosoftGraph
   BASE_URL = 'https://graph.microsoft.com/v1.0'.freeze
-  BETA_BASE_URL = 'https://graph.microsoft.com/beta'.freeze
-  # Documentation says that "common" can be used (instead of tenantID) to refresh access token
-  REFRESH_TOKEN_URL = 'https://login.microsoftonline.com/common/oauth2/v2.0/token'.freeze
 
-  def initialize(current_user, client_id, client_secret, scopes)
+  def initialize(current_user, client_id, client_secret, tenant_id, scopes)
     @current_user = current_user
     @uid = current_user.microsoft_user_id
     @token = current_user.microsoft_access_token
     @refresh_token = current_user.microsoft_refresh_token
-    @expires_at = current_user.microsoft_token_expires_at
+    @token_expires_at = current_user.microsoft_token_expires_at
 
     @client_id = client_id
     @client_secret = client_secret
+    @tenant_id = tenant_id
     @scopes = scopes
   end
 
-  def request(resource)
-    return false unless @token
-
-    response = HTTParty.get(
-      "#{BASE_URL}/#{resource}",
-      headers: {
-        Authorization: "Bearer #{@token}"
-      }
-    )
-
-    if response.code != 200
-      p '[Microsoft Graph API Error]'
-      p response.inspect
-      false
-    else
-      JSON.parse(response.body)
+  def create_teams_meeting(subject)
+    # Obtain new token if token is expired or will expire in less than 5 minutes
+    if 5.minutes.from_now.to_i > @token_expires_at.seconds
+      refresh_access_token
     end
-  end
-
-  def create_teams_meeting(start_date_time, end_date_time, subject)
-    # check if token expired and obtain new access_token using refresh token
 
     response = HTTParty.post(
-      "#{BETA_BASE_URL}/me/onlineMeetings",
+      "#{BASE_URL}/me/onlineMeetings",
       body: {
-        startDateTime: start_date_time,
-        endDateTime: end_date_time,
         subject: subject,
         participants: {
           organizer: {
@@ -55,22 +35,35 @@ class MicrosoftGraph
             }
           }
         }
-      },
+      }.to_json,
       headers: {
-        Authorization: "Bearer #{@token}"
+        Authorization: "Bearer #{@token}",
+        'Content-Type': 'application/json'
       }
     )
 
+    raise StandardError, 'Authenticated user does not have a permission to create Teams Online Meeting' if response.code == 403
+
     if response.code != 201
-      p '[Microsoft Graph API Error] Failed to create online meeting'
-      p response.inspect
+      Rails.logger.error('[Microsoft Graph Error]')
+      Rails.logger.error(response.inspect)
+      raise StandardError, "Failed to create teams meeting [#{response.code}]"
     else
       JSON.parse(response.body)
     end
   end
 
-  def refresh_token
-    response = HTTParty.post(REFRESH_TOKEN_URL,
+  private
+
+  def refresh_token_url
+    "https://login.microsoftonline.com/#{@tenant_id}/oauth2/v2.0/token"
+  end
+
+  def refresh_access_token
+    response = HTTParty.post(refresh_token_url,
+                             headers: {
+                               'Content-Type': 'application/x-www-form-urlencoded'
+                             },
                              body: {
                                client_id: @client_id,
                                client_secret: @client_secret,
@@ -79,5 +72,26 @@ class MicrosoftGraph
                                scope: @scopes
                              })
 
+    if response.code != 200
+      Rails.logger.error '[Microsoft Graph Error] Failed to obtain new access token using refresh token'
+      Rails.logger.error(response.inspect)
+      raise StandardError, 'Failed to obtain new access token'
+    end
+
+    parsed_response = JSON.parse(response.body)
+
+    new_access_token = parsed_response['access_token']
+    new_refresh_token = parsed_response['refresh_token']
+    token_expires_in = parsed_response['expires_in'] # For how long access token is valid (in seconds)
+    token_new_expiration_time = Time.now.to_i + token_expires_in
+
+    @current_user.microsoft_access_token = new_access_token
+    @current_user.microsoft_refresh_token = new_refresh_token
+    @current_user.microsoft_token_expires_at = token_new_expiration_time
+    @current_user.save!
+
+    @token = new_access_token
+    @refresh_token = new_refresh_token
+    @token_expires_at = token_new_expiration_time
   end
 end