ToolJet/app/services/google_oauth_service.rb

class GoogleOauthService

    def self.generate_base_auth_url
        client_id = ENV.fetch('GOOGLE_CLIENT_ID')
        "https://accounts.google.com/o/oauth2/v2/auth?response_type=code&client_id=#{client_id}&redirect_uri=#{ENV.fetch("TOOLJET_HOST")}/oauth2/authorize"
    end

    def self.fetch_access_token(code)

        access_token_url = 'https://oauth2.googleapis.com/token'
        client_id = ENV.fetch('GOOGLE_CLIENT_ID')
        client_secret = ENV.fetch('GOOGLE_CLIENT_SECRET')
        grant_type = 'authorization_code'

        custom_params = [
            ['prompt', 'consent'],
            ['access_type', 'offline']
        ].to_h

        response = HTTParty.post(access_token_url, 
            :body => { :code => code, 
                       :client_id => client_id, 
                       :client_secret => client_secret, 
                       :grant_type => grant_type, 
                       :redirect_uri => "#{ENV.fetch("TOOLJET_HOST")}/oauth2/authorize",
                       **custom_params
            }.to_json,
            :headers => { 'Content-Type' => 'application/json' } )

        result = JSON.parse(response.body)

        access_token = result["access_token"]
        refresh_token = result["refresh_token"]

        [['access_token', access_token], ['refresh_token', refresh_token]]
    end
end