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package twilio
import (
"bytes"
"crypto/hmac"
"crypto/sha1"
"encoding/base64"
"io"
"net/url"
"sort"
)
// Signature will calculate the raw signature for a request from Twilio.
// https://www.twilio.com/docs/api/security#validating-requests
func Signature(authToken, url string, fields url.Values) []byte {
buf := new(bytes.Buffer)
buf.WriteString(url)
fieldNames := make(sort.StringSlice, 0, len(fields))
for name := range fields {
fieldNames = append(fieldNames, name)
}
fieldNames.Sort()
for _, fieldName := range fieldNames {
buf.WriteString(fieldName + fields.Get(fieldName))
}
hash := hmac.New(sha1.New, []byte(authToken))
_, _ = io.Copy(hash, buf)
buf.Reset()
enc := base64.NewEncoder(base64.StdEncoding, buf)
_, _ = enc.Write(hash.Sum(nil))
_ = enc.Close()
return buf.Bytes()
}
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