如何在Ruby中使用Gmail API回复消息？

gem install google-api-client
gem install googleauth
gem install gmail

require 'google/apis/gmail_v1'
require 'googleauth'
require 'googleauth/stores/file_token_store'
require 'fileutils'

OOB_URI = 'urn:ietf:wg:oauth:2.0:oob'.freeze
APPLICATION_NAME = 'Gmail API Ruby Quickstart'.freeze
CREDENTIALS_PATH = 'credentials.json'.freeze
TOKEN_PATH = 'token.yaml'.freeze
SCOPE = Google::Apis::GmailV1::AUTH_GMAIL_READONLY

def authorize
  client_id = Google::Auth::ClientId.from_file(CREDENTIALS_PATH)
  token_store = Google::Auth::Stores::FileTokenStore.new(file: TOKEN_PATH)
  authorizer = Google::Auth::UserAuthorizer.new(client_id, SCOPE, token_store)
  user_id = 'default'
  credentials = authorizer.get_credentials(user_id)
  if credentials.nil?
    url = authorizer.get_authorization_url(base_url: OOB_URI)
    puts 'Open the following URL in the browser and enter the ' \
         "resulting code after authorization:\n" + url
    code = gets
    credentials = authorizer.get_and_store_credentials_from_code(
      user_id: user_id, code: code, base_url: OOB_URI
    )
  end
  credentials
end

def reply_to_message(service, user_id, message_id, reply_text)
  message = service.get_user_message(user_id, message_id)
  thread_id = message.thread_id
  reply = Google::Apis::GmailV1::Message.new(
    raw: Base64.urlsafe_encode64("To: #{message.payload.headers.find { |h| h.name == 'From' }.value}\n" \
                                 "Subject: Re: #{message.payload.headers.find { |h| h.name == 'Subject' }.value}\n" \
                                 "\n" \
                                 "#{reply_text}")
  )
  service.send_user_message(user_id, reply, thread_id: thread_id)
end

def main
  service = Google::Apis::GmailV1::GmailService.new
  service.client_options.application_name = APPLICATION_NAME
  service.authorization = authorize

  user_id = 'me'
  message_id = 'YOUR_MESSAGE_ID' # 替换为要回复的消息的ID
  reply_text = 'YOUR_REPLY_TEXT' # 替换为要回复的内容

  reply_to_message(service, user_id, message_id, reply_text)
end

main if __FILE__ == $PROGRAM_NAME

ruby your_script.rb