shitty_ruby_signer.rb

# Signs a URI with your appSID and Key.
# * :url describes the URL to sign
# * :appSID holds the appSID value
# * :key holds the key value

def self.sign(url, AppSID, AppKey)
  url = URI.escape(url)
  parsedURL = URI.parse(url)
  
  urlToSign =''
  if parsedURL.query.nil?
    urlToSign = parsedURL.scheme+"://"+ parsedURL.host + parsedURL.path + "?appSID=" + AppSID
  else
    urlToSign = parsedURL.scheme+"://"+ parsedURL.host + parsedURL.path + '?' + parsedURL.query + "&appSID=" + AppSID
  end
  
  # create a signature using the private key and the URL
  rawSignature = OpenSSL::HMAC.digest(OpenSSL::Digest::Digest.new('sha1'), AppKey, urlToSign)
  
  #Convert raw to encoded string
  signature = Base64.strict_encode64(rawSignature).tr('+/','-_')
  
  #remove invalid character
  signature = signature.gsub(/[=_-]/,'=' => '','_' => '%2f','-' => '%2b')
  
  #Define expression
  pat = Regexp.new("%[0-9a-f]{2}")
  
  #Replace the portion matched to the above pattern to upper case
  for i in 0..5
   signature = signature.sub(pat,pat.match(signature).to_s.upcase)
  end
  
  # prepend the server and append the signature.
  signedUrl = urlToSign + "&signature=#{signature}"
  return signedUrl
end

Friends don't let non ruby developers write ruby code.