Bitstamp API Authentication - ruby

Question

Im a ruby fan and i am also buying/selling bitcoins on the bitstamp exchange. I have used the bitstamp api successfully in the past with python and i also want to try ruby for that task. I have not been successfull with that though.
Here is a python code that works
import hashlib
import hmac
import time
import requests
import uuid
import sys
api_key = 'some api key'
API_SECRET = b'some secret api key'
timestamp = str(int(round(time.time() * 1000)))
nonce = str(uuid.uuid4())
content_type = 'application/x-www-form-urlencoded'
payload = {'offset': '1'}
if sys.version_info.major >= 3:
from urllib.parse import urlencode
else:
from urllib import urlencode
payload_string = urlencode(payload)
# '' (empty string) in message represents any query parameters or an empty string in case there are none
message = 'BITSTAMP ' + api_key + \
'POST' + \
'www.bitstamp.net' + \
'/api/v2/user_transactions/' + \
'' + \
content_type + \
nonce + \
timestamp + \
'v2' + \
payload_string
message = message.encode('utf-8')
signature = hmac.new(API_SECRET, msg=message, digestmod=hashlib.sha256).hexdigest()
headers = {
'X-Auth': 'BITSTAMP ' + api_key,
'X-Auth-Signature': signature,
'X-Auth-Nonce': nonce,
'X-Auth-Timestamp': timestamp,
'X-Auth-Version': 'v2',
'Content-Type': content_type
}
r = requests.post(
'https://www.bitstamp.net/api/v2/user_transactions/',
headers=headers,
data=payload_string
)
if not r.status_code == 200:
raise Exception('Status code not 200')
string_to_sign = (nonce + timestamp + r.headers.get('Content-Type')).encode('utf-8') + r.content
signature_check = hmac.new(API_SECRET, msg=string_to_sign, digestmod=hashlib.sha256).hexdigest()
if not r.headers.get('X-Server-Auth-Signature') == signature_check:
raise Exception('Signatures do not match')
print(r.content)
And here is my Ruby code
require "awesome_print"
require "json"
require "securerandom"
require "openssl"
require "uri"
require "net/http"
api_key = 'Some api key'
API_SECRET = 'Some secret api key'
nonce = SecureRandom.uuid
timestamp = Time.new.strftime('%s%L')
content_type = 'application-x-www-form-urlencoded'
data= {'offset' => '1'}
data_string = URI.encode_www_form(data)
message = 'BITSTAMP' + '' + api_key + 'POST' + 'www.bitstamp.net' + 'api/v2/balance' + '' +
content_type + nonce + timestamp + 'v2' + data_string
message.encode("UTF-8")
signature = OpenSSL::HMAC.hexdigest("SHA256", API_SECRET, message)
headers = { 'X-Auth' => 'BITSTAMP ' + api_key,
'X-Auth-Signature' => signature,
'X-Auth-Nonce' => nonce,
'X-Auth-Timestamp' => timestamp,
'X-Auth-Version' => 'V2',
'Content-Type' => content_type
}
uri = URI("https://www.bitstamp.net/api/v2/balance/")
res = Net::HTTP.post_form(uri, {headers => headers, data => data_string})
puts res.body
The api gives me back an error. The error is
{“status”: “error”, “reason”: “Missing key, signature and nonce parameters”, “code”: “API0000”}
Im a novice programmer so i don’t have deep skills in this. If anyone has an idea to get this ruby code to work that would
be highly appreciated. Thanx for reading.
Regards.
Primtala