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package mturk
import (
"crypto/hmac"
"crypto/sha1"
"encoding/base64"
"github.com/AdRoll/goamz/aws"
)
var b64 = base64.StdEncoding
// ----------------------------------------------------------------------------
// Mechanical Turk signing (http://goo.gl/wrzfn)
func sign(auth aws.Auth, service, method, timestamp string, params map[string]string) {
payload := service + method + timestamp
hash := hmac.New(sha1.New, []byte(auth.SecretKey))
hash.Write([]byte(payload))
signature := make([]byte, b64.EncodedLen(hash.Size()))
b64.Encode(signature, hash.Sum(nil))
params["Signature"] = string(signature)
}
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