func sign(auth aws.Auth, method, path string, params map[string]string, host string) {
params["AWSAccessKeyId"] = auth.AccessKey
params["SignatureVersion"] = "2"
params["SignatureMethod"] = "HmacSHA256"
if auth.Token() != "" {
params["SecurityToken"] = auth.Token()
}
var sarray []string
for k, v := range params {
sarray = append(sarray, aws.Encode(k)+"="+aws.Encode(v))
}
sort.StringSlice(sarray).Sort()
joined := strings.Join(sarray, "&")
payload := method + "\n" + host + "\n" + path + "\n" + joined
hash := hmac.New(sha256.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)
}
func (s *S) TestEncode(c *check.C) {
c.Assert(aws.Encode("foo"), check.Equals, "foo")
c.Assert(aws.Encode("/"), check.Equals, "%2F")
}