feat: accept transports information (#8)

Allows presenting the result from AuthenticatorAttestationResponse.getTransports() to the library. Not supported by all browsers.

See https://developer.mozilla.org/en-US/docs/Web/API/AuthenticatorAttestationResponse/getTransports.

protocol/credential.go

@@ -45,12 +45,14 @@ type ParsedPublicKeyCredential struct {
 type CredentialCreationResponse struct {
 	PublicKeyCredential
 	AttestationResponse AuthenticatorAttestationResponse `json:"response"`
+	Transport           []string                         `json:"transports,omitempty"`
 }
 
 type ParsedCredentialCreationData struct {
 	ParsedPublicKeyCredential
-	Response ParsedAttestationResponse
-	Raw      CredentialCreationResponse
+	Response  ParsedAttestationResponse
+	Raw       CredentialCreationResponse
+	Transport []AuthenticatorTransport `json:"transports,omitempty"`
 }
 
 func ParseCredentialCreationResponse(response *http.Request) (*ParsedCredentialCreationData, error) {
@@ -88,6 +90,14 @@ func ParseCredentialCreationResponseBody(body io.Reader) (*ParsedCredentialCreat
 	pcc.ID, pcc.RawID, pcc.Type, pcc.ClientExtensionResults = ccr.ID, ccr.RawID, ccr.Type, ccr.ClientExtensionResults
 	pcc.Raw = ccr
 
+	for _, t := range ccr.Transport {
+		transport := AuthenticatorTransport(t)
+		switch transport {
+		case USB, BLE, NFC, Internal:
+			pcc.Transport = append(pcc.Transport, transport)
+		}
+	}
+
 	parsedAttestationResponse, err := ccr.AttestationResponse.Parse()
 	if err != nil {
 		return nil, ErrParsingData.WithDetails("Error parsing attestation response")

webauthn/credential.go

@@ -15,6 +15,8 @@ type Credential struct {
 	PublicKey []byte
 	// The attestation format used (if any) by the authenticator when creating the credential.
 	AttestationType string
+	// The transport types the authenticator supports.
+	Transport []protocol.AuthenticatorTransport
 	// The Authenticator information for a given certificate
 	Authenticator Authenticator
 }
@@ -25,6 +27,7 @@ func MakeNewCredential(c *protocol.ParsedCredentialCreationData) (*Credential, e
 		ID:              c.Response.AttestationObject.AuthData.AttData.CredentialID,
 		PublicKey:       c.Response.AttestationObject.AuthData.AttData.CredentialPublicKey,
 		AttestationType: c.Response.AttestationObject.Format,
+		Transport:       c.Transport,
 		Authenticator: Authenticator{
 			AAGUID:    c.Response.AttestationObject.AuthData.AttData.AAGUID,
 			SignCount: c.Response.AttestationObject.AuthData.Counter,