auth: publish passkey foundations preview

third_party/go-webauthn/metadata/providers/cached/util.go

@@ -0,0 +1,51 @@
+package cached
+
+import (
+	"io"
+	"os"
+
+	"github.com/go-webauthn/webauthn/metadata"
+	"github.com/go-webauthn/webauthn/metadata/providers/memory"
+)
+
+func doTruncateCopyAndSeekStart(f *os.File, rc io.ReadCloser) (err error) {
+	if err = f.Truncate(0); err != nil {
+		return err
+	}
+
+	if _, err = io.Copy(f, rc); err != nil {
+		return err
+	}
+
+	if _, err = f.Seek(0, io.SeekStart); err != nil {
+		return err
+	}
+
+	return rc.Close()
+}
+
+func doOpenOrCreate(name string) (f *os.File, created bool, err error) {
+	if f, err = os.OpenFile(name, os.O_RDWR, 0); err == nil {
+		return f, false, nil
+	}
+
+	if os.IsNotExist(err) {
+		if f, err = os.Create(name); err != nil {
+			return nil, false, err
+		}
+
+		return f, true, nil
+	}
+
+	return nil, false, err
+}
+
+func defaultNew(mds *metadata.Metadata) (provider metadata.Provider, err error) {
+	return memory.New(
+		memory.WithMetadata(mds.ToMap()),
+		memory.WithValidateEntry(true),
+		memory.WithValidateEntryPermitZeroAAGUID(false),
+		memory.WithValidateTrustAnchor(true),
+		memory.WithValidateStatus(true),
+	)
+}