Example of how to use OAuth to access the Tumblr API in Sinatra.

sinatra_tumblr_oauth_example.rb

gem 'sinatra', '~> 1.4.7'
require 'sinatra'
gem 'oauth', '~> 0.5.1'
require 'oauth'
gem 'tumblr_client', '~> 0.8.5'
require 'tumblr_client'

# This is an example of how to use OAuth to access the Tumblr API in Sinatra. 
# Based on dcesteri's Twitter example:
#   https://github.com/dcestari/sinatra-twitter-oauth-sample
# Thanks, dcesteri.

# STEP 1: Register your app with Tumblr at
#   https://www.tumblr.com/oauth/register
# The data you input isn't all that important, but it's easiest to use
#   http://localhost:4567/oauth/callback
# as the default callback url.

# STEP 2: Fill in these two variables with the consumer key and secret you got
# in Step 1.
CONSUMER_KEY    = "Your consumer key goes here."
CONSUMER_SECRET = "Your consumer secret goes here."

CALLBACK_URL    = "http://localhost:4567/oauth/callback"
ENDPOINT        = "https://www.tumblr.com"

configure do
  enable :sessions
  set :session_secret, 'secret'
end

# STEP 3: Run this script.

# STEP 4: In your browser, while logged in to a Tumblr account, go to 
#   http://localhost:4567/oauth/request_token
# and click the link.
get '/oauth/request_token' do
  consumer = OAuth::Consumer.new(CONSUMER_KEY, CONSUMER_SECRET, :site => ENDPOINT)

  request_token = consumer.get_request_token(:oauth_callback => CALLBACK_URL)
  session[:request_token] = request_token.token
  session[:request_token_secret] = request_token.secret

  puts "request: token=#{session[:request_token]}, token_secret=#{session[:request_token_secret]}"

  "<a href='#{request_token.authorize_url}'>#{request_token.authorize_url}</a>"
end

# STEP 5: If you didn't get forwarded there automatically, go to
#   http://localhost:4567/oauth/callback
# If everything worked, you've completed the OAuth dance successfully, and
# you'll see some output from the API.
get '/oauth/callback' do
  consumer = OAuth::Consumer.new(CONSUMER_KEY, CONSUMER_SECRET, :site => ENDPOINT)

  puts "CALLBACK: request: token=#{session[:request_token]}, token_secret=#{session[:request_token_secret]}"

  request_token = OAuth::RequestToken.new(consumer, session[:request_token], session[:request_token_secret])
  access_token = request_token.get_access_token(:oauth_verifier => params[:oauth_verifier])

  Tumblr.configure do |config|
    config.consumer_key = CONSUMER_KEY
    config.consumer_secret = CONSUMER_SECRET
    config.oauth_token = access_token.token
    config.oauth_token_secret = access_token.secret
  end

  # Finally, we have our Tumblr::Client object!
  client = Tumblr::Client.new

  "We have our Tumblr::Client object! Let's fetch some data with it.<br /><br />

  #{client.info}"
end