gistfile1.rb

require 'rubygems'
require 'oauth'

# KEY and SECRET are available in Desk.com Admin -> Settings -> API ->
# My Applications -> Key and Secret fields
KEY    = "YOUR_OAUTH_KEY"
SECRET = "YOUR_OAUTH_SECRET"
SITE   = "https://yoursite.desk.com"

# start the process by requesting a token
callback_url  = "https://example.com/oauth/callback"
consumer      = OAuth::Consumer.new(KEY, SECRET, site: SITE)
request_token = consumer.get_request_token(oauth_callback: callback_url)

# for demonstration purposes, visit this URL in your web browser and authorize
# the request. for a live application, redirect your user user to this URL
puts request_token.authorize_url(oauth_callback: callback_url)

# after the application is authorized, Desk.com will send a request to your
# callback_url with two parameters, oauth_token and oauth_verifier
oauth_token    = "oauth_token_param"
oauth_verifier = "oauth_verifier_param"

# retrieve the access token
access_token = request_token.get_access_token(oauth_token: oauth_token,
  oauth_verifier: oauth_verifier)

# send a GET request to Desk.com
access_token.get("/api/v2/cases")

# from here you can store the credentials to make requests in the future