How to create and send a google chat message with Ruby

In my rails application, I am trying to create and send a google chat message using the api method spaces.messages.create as explained in this documentation. To do that, I will have to authenticate with a service account. I cant find examples on how to do this with ruby in reference to google chat. It seems like I will have to use the ruby cloud sdk but I cant find any reference to google chat here . Instead of using the google cloud sdk, is it possible to do this with a ruby http client?

I will like to know how to authenticate using a service account and sending a message to google chat using the api method spaces.messages.create

I think the steps are as follows:

1. Create a service account in order to use the https://www.googleapis.com/auth/chat.bot scope.

Only supports service accounts. You can't authenticate user credentials using this scope.

2. Use the Service Account Auth Flow within googleauth.

scope = 'https://www.googleapis.com/auth/androidpublisher'

authorizer = Google::Auth::ServiceAccountCredentials.make_creds(
  json_key_io: File.open('/path/to/service_account_json_key.json'),
  scope: scope)

authorizer.fetch_access_token!

3- Use the google-apis-chat_v1 for performing the request.

In any case, I strongly review the documentation for Google Chats API, for a full understanding on how the authorization flow works.

Updated

Sample ruby client send message

require 'googleauth'
require 'googleauth/stores/file_token_store'
require 'google/apis/chat_v1'

scope = 'https://www.googleapis.com/auth/chat.bot'

authorizer = Google::Auth::ServiceAccountCredentials.make_creds(
  json_key_io: File.open('./credentials.json'),
  scope: scope)


chat =  Google::Apis::ChatV1::HangoutsChatService.new
msg = Google::Apis::ChatV1::Message.new(text: 'test')

chat.authorization = Google::Auth::ServiceAccountCredentials.make_creds(
  json_key_io: File.open('./credentials.json'),
  scope: scope)
  
  
chat.create_space_message('spaces/XXXXXXXX', msg)