A utility for signing an url using OAuth in a way that's convenient for debugging

example.rb

require 'oauth_util.rb'
require 'net/http'

o = OauthUtil.new

o.consumer_key = 'examplek9SGJUTUpocjZ5QjBJmQ9WVdrOVVFNHdSR2x1TkhFbWNHbzlNQS0tJnM9Y29uc3VtkZXJzZWNyZXQmeD0yYg--';
o.consumer_secret = 'exampled88d4109c63e778dsadcdd5c1875814977';

url = 'http://query.yahooapis.com/v1/yql?q=select%20*%20from%20social.updates.search%20where%20query%3D%22search%20terms%22&diagnostics=true';

parsed_url = URI.parse( url )

Net::HTTP.start( parsed_url.host ) { | http |
  req = Net::HTTP::Get.new "#{ parsed_url.path }?#{ o.sign(parsed_url).query_string }"
  response = http.request(req)
  print response.read_body
}

oauth_util.rb

# A utility for signing an url using OAuth in a way that's convenient for debugging
# Note: the standard Ruby OAuth lib is here http://github.com/mojodna/oauth
# License: http://gist.github.com/375593
# Usage: see example.rb below

require 'uri'
require 'cgi'
require 'openssl'
require 'base64'

class OauthUtil
  
  attr_accessor :consumer_key, :consumer_secret, :token, :token_secret, :req_method, 
                :sig_method, :oauth_version, :callback_url, :params, :req_url, :base_str
  
  def initialize
    @consumer_key = ''
    @consumer_secret = ''
    @token = ''
    @token_secret = ''
    @req_method = 'GET'
    @sig_method = 'HMAC-SHA1'
    @oauth_version = '1.0'
    @callback_url = ''
  end
  
  # openssl::random_bytes returns non-word chars, which need to be removed. using alt method to get length
  # ref http://snippets.dzone.com/posts/show/491
  def nonce
    Array.new( 5 ) { rand(256) }.pack('C*').unpack('H*').first
  end
  
  def percent_encode( string )
    
    # ref http://snippets.dzone.com/posts/show/1260
    return URI.escape( string, Regexp.new("[^#{URI::PATTERN::UNRESERVED}]") ).gsub('*', '%2A')
  end
  
  # @ref http://oauth.net/core/1.0/#rfc.section.9.2
  def signature
    key = percent_encode( @consumer_secret ) + '&' + percent_encode( @token_secret )
    
    # ref: http://blog.nathanielbibler.com/post/63031273/openssl-hmac-vs-ruby-hmac-benchmarks
    digest = OpenSSL::Digest::Digest.new( 'sha1' )
    hmac = OpenSSL::HMAC.digest( digest, key, @base_str )
    
    # ref http://groups.google.com/group/oauth-ruby/browse_thread/thread/9110ed8c8f3cae81
    Base64.encode64( hmac ).chomp.gsub( /\n/, '' )
  end
  
  # sort (very important as it affects the signature), concat, and percent encode
  # @ref http://oauth.net/core/1.0/#rfc.section.9.1.1
  # @ref http://oauth.net/core/1.0/#9.2.1
  # @ref http://oauth.net/core/1.0/#rfc.section.A.5.1
  def query_string
    pairs = []
    @params.sort.each { | key, val | 
      pairs.push( "#{ percent_encode( key ) }=#{ percent_encode( val.to_s ) }" )
    }
    pairs.join '&'
  end
  
  # organize params & create signature
  def sign( parsed_url )
    
    @params = {
      'oauth_consumer_key' => @consumer_key,
      'oauth_nonce' => nonce,
      'oauth_signature_method' => @sig_method,
      'oauth_timestamp' => Time.now.to_i.to_s,
      'oauth_version' => @oauth_version
    }

    # if url has query, merge key/values into params obj overwriting defaults
    if parsed_url.query
      @params.merge! CGI.parse( parsed_url.query )
    end
    
    # @ref http://oauth.net/core/1.0/#rfc.section.9.1.2
    @req_url = parsed_url.scheme + '://' + parsed_url.host + parsed_url.path
    
    # create base str. make it an object attr for ez debugging
    # ref http://oauth.net/core/1.0/#anchor14
    @base_str = [ 
      @req_method, 
      percent_encode( req_url ), 
      
      # normalization is just x-www-form-urlencoded
      percent_encode( query_string ) 
      
    ].join( '&' )

    # add signature
    @params[ 'oauth_signature' ] = signature
    
    return self
  end
end

For Zeokat deal with OAuth is always painfull, thanks for the code.

Dealing with oauth_token:

• first send a request for tokens (your API provider should tell you how)
• edit oauth_lib.rb, in the method sign (line 64) add 'oauth_token' => 'your token' to the hashtab, between oauth_timestamp and oauth_version (it should be ordered in alphabetical order)
• In your main program initialize the o.token and o.token_secret variables with your values

Has anyone gotten this to work with Twitter's API? I've made all the updates outlined in the comments and still get 215 bad authentication data errors.

Line 44 in oauth_util.rb should be changed to

digest = OpenSSL::Digest.new( 'sha1' )

Because you will get a message saying "Digest::Digest is deprecated; Use Digest"

http://stackoverflow.com/questions/21184960/ruby-digestdigest-is-deprecated-use-digest

The API I'm working with requires the Auth params to be added to the header, as per the option in Postman:

request["authorization"] = 'OAuth oauth_consumer_key=\"MyKey\",oauth_token=\"MyToken\",oauth_signature_method=\"HMAC-SHA1\",oauth_timestamp=………etcetc

Did anyone manage to modify this script to also add that authorization header to the request?