Complete teams meeting creation and token refresh

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