cheap oauth implementation

gistfile1.rb

  module Session

    def self.generate_timestamp
      Time.now.strftime("%s")
    end
    
    def self.generate_nonce
      rand(36**16).to_s(36)
    end

    def self.generate_signature(url,params,oauth_consumer_secret,oauth_secret_token,method = 'GET')
      params.delete(:oauth_signature)
      parameters = Hash[*params.sort.flatten]
      base_string = "#{method+'&'+ERB::Util.url_encode(url)+'&'}#{parameters.to_encoded_querystring}"
      params[:oauth_signature] = Base64.encode64(OpenSSL::HMAC.digest('sha1',"#{oauth_consumer_secret}&#{oauth_secret_token}",base_string)).chomp.gsub(/\n/,'')
    end

    def self.build_url(params)
      parameters = params.dup
      parameters.merge!(
        oauth_consumer_key: '',
        oauth_token: '',
        oauth_signature_method: 'HMAC-SHA1',
        oauth_timestamp: generate_timestamp,
        oauth_nonce: generate_nonce,
        oauth_version: '1.0'
      )
      generate_signature(BASE_URI,parameters,OAUTH_CONSUMER_SECRET,'oauth_secret','GET')
      url = "#{BASE_URI}?#{parameters.to_querystring}"
    end
  end