func SignatureFromHeaders(signatureHeader, metadataHeader string, crypto secure.Crypto) (Signature, error) { metadata := Metadata{} signature := Signature{} if metadataHeader == "" { return signature, errors.New("No metadata found") } metadataDecoded, err := base64.URLEncoding.DecodeString(metadataHeader) if err != nil { return signature, err } err = json.Unmarshal(metadataDecoded, &metadata) signatureDecoded, err := base64.URLEncoding.DecodeString(signatureHeader) if err != nil { return signature, err } signatureDecrypted, err := crypto.Decrypt(signatureDecoded, metadata.Nonce) if err != nil { return signature, err } err = json.Unmarshal([]byte(signatureDecrypted), &signature) return signature, err }