How to post multipart/form-data with OAuth in Ruby

how-to-post-multipart-form-data-with-oauth.rb

require 'oauth/consumer'
require 'net/http/post/multipart'

OAuth::VERSION = 1.0

consumer = OAuth::Consumer.new('consumer_key', 'consumer_secret',
                               :site => 'http://provider.example.com',
                               :request_token_path => '/request_token',
                               :authorize_path => '/authorize',
                               :access_token_path => '/access.token')

request_token = consumer.get_request_token(:oauth_callback => 'http://consumer.example.com/callback')

puts request_token.authorize_url # put the url displayed in your browser then authorize it.

access_token = request_token.get_access_token

File.open("./image.jpg") do |image|
  req = Net::HTTP::Post::Multipart.new(url.path,
                                       'text' => 'hi, there',
                                       'image' => UploadIO.new(image, "image/jpeg", "image.jpg"))
  access_token.sign! req
  res = Net::HTTP.start('provider.example.com', 80) do |http|
    http.request(req)
  end
end