DeviceType (#13)

fido2.go

@@ -58,6 +58,18 @@ type DeviceInfo struct {
 	Protocols  []byte
 }
 
+// DeviceType is latest type the device supports.
+type DeviceType string
+
+const (
+	// UnknownDevice ...
+	UnknownDevice DeviceType = ""
+	// FIDO2 ...
+	FIDO2 DeviceType = "fido2"
+	// U2F ...
+	U2F DeviceType = "u2f"
+)
+
 // RelyingParty ...
 type RelyingParty struct {
 	ID   string
@@ -267,6 +279,21 @@ func (d *Device) IsFIDO2() (bool, error) {
 	return isFIDO2, nil
 }
 
+// Type returns device type.
+func (d *Device) Type() (DeviceType, error) {
+	dev, err := open(d.path)
+	if err != nil {
+		return UnknownDevice, err
+	}
+	defer close(dev)
+
+	isFIDO2 := bool(C.fido_dev_is_fido2(dev))
+	if isFIDO2 {
+		return FIDO2, nil
+	}
+	return U2F, nil
+}
+
 // Info represents authenticatorGetInfo (0x04).
 // https://fidoalliance.org/specs/fido2/fido-client-to-authenticator-protocol-v2.1-rd-20191217.html#authenticatorGetInfo
 func (d *Device) Info() (*DeviceInfo, error) {

fido2_test.go

@@ -25,6 +25,10 @@ func TestDevices(t *testing.T) {
 			continue
 		}
 
+		typ, err := device.Type()
+		require.NoError(t, err)
+		require.Equal(t, libfido2.FIDO2, typ)
+
 		// Testing info twice (hid_osx issues in the past caused a delayed 2nd request to fail).
 		info, err := device.Info()
 		require.NoError(t, err)