Ruby method for building an OAuth 1.0 request signature This validates against http://oauth.googlecode.com/svn/code/javascript/example/signature.html

build_signature.rb

module OAuth
  def self.build_signature oauth
    request_params = oauth[:request_params]
    request_params[:oauth_consumer_key] = oauth[:oauth_consumer_key]
    request_params[:oauth_nonce] = oauth[:oauth_nonce]
    request_params[:oauth_signature_method] = 'HMAC-SHA1'
    request_params[:oauth_timestamp] = oauth[:oauth_timestamp]
    request_params[:oauth_token] = oauth[:oauth_token]
    request_params[:oauth_version] = '1.0'

    pairs = []
    request_params.sort.each do | key, val |
      pairs.push( "#{ percent_encode( key.to_s ) }=#{ percent_encode( val.to_s ) }" )
    end
    base_string = pairs.join '&'

    encoded_string = percent_encode(base_string)
    encoded_url = percent_encode(oauth[:url])
    http_method = oauth[:http_method]

    signature_string = "#{http_method}&#{encoded_url}&#{encoded_string}"

      signature_key = "#{oauth[:consumer_secret]}&#{oauth[:token_secret]}"

      hash = OpenSSL::HMAC.digest('sha1', signature_key, signature_string)
    Base64.strict_encode64 hash
  end

  def self.percent_encode( value )
    # see: https://gist.github.com/alanstevens/6813382
    # and: http://en.wikipedia.org/wiki/Percent-encoding
    URI::escape(value, /[^a-zA-Z0-9\-\.\_\~]/)
  end
end