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()
}
// AWS specifies that the parameters in a signed request must
// be provided in the natural order of the keys. This is distinct
// from the natural order of the encoded value of key=value.
// Percent and gocheck.Equals affect the sorting order.
var keys, sarray []string
for k, _ := range params {
keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
sarray = append(sarray, aws.Encode(k)+"="+aws.Encode(params[k]))
}
// Check whether path has any length and if not set it to /
if len(path) == 0 {
path = "/"
}
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 sign(auth aws.Auth, method, path string, params url.Values, headers http.Header) {
var host string
for k, v := range headers {
k = strings.ToLower(k)
switch k {
case "host":
host = v[0]
}
}
// set up some defaults used for signing the request
if auth.Token() != "" {
params["SecurityToken"] = []string{auth.Token()}
}
params["AWSAccessKeyId"] = []string{auth.AccessKey}
params["SignatureVersion"] = []string{"2"}
params["SignatureMethod"] = []string{"HmacSHA256"}
// join up all the incoming params
var sarray []string
for k, v := range params {
sarray = append(sarray, aws.Encode(k)+"="+aws.Encode(v[0]))
}
sort.StringSlice(sarray).Sort()
joined := strings.Join(sarray, "&")
// create the payload, sign it and create the signature
payload := strings.Join([]string{method, host, "/", joined}, "\n")
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))
// add the signature to the outgoing params
params["Signature"] = []string{string(signature)}
}