webauthnutil: add helpers for webauthn (#2686)

* devices: add device protobuf types

* webauthnutil: add helpers for webauthn

pkg/webauthnutil/user_test.go

@@ -0,0 +1,48 @@
+package webauthnutil
+
+import (
+	"testing"
+
+	"github.com/google/uuid"
+	"github.com/stretchr/testify/assert"
+
+	"github.com/pomerium/pomerium/pkg/grpc/user"
+)
+
+func TestGetUserEntity(t *testing.T) {
+	t.Run("name as email", func(t *testing.T) {
+		ue := GetUserEntity(&user.User{
+			Id:    "test",
+			Email: "test@example.com",
+		})
+		assert.Equal(t, "test@example.com", ue.Name)
+	})
+	t.Run("name as id", func(t *testing.T) {
+		ue := GetUserEntity(&user.User{
+			Id: "test",
+		})
+		assert.Equal(t, "test", ue.Name)
+	})
+	t.Run("displayName as name", func(t *testing.T) {
+		ue := GetUserEntity(&user.User{
+			Id:   "test",
+			Name: "Test User",
+		})
+		assert.Equal(t, "Test User", ue.DisplayName)
+	})
+	t.Run("displayName as email", func(t *testing.T) {
+		ue := GetUserEntity(&user.User{
+			Id:    "test",
+			Email: "test@example.com",
+		})
+		assert.Equal(t, "test@example.com", ue.DisplayName)
+	})
+}
+
+func TestGetUserEntityID(t *testing.T) {
+	userID := "test@example.com"
+	rawUserEntityID := GetUserEntityID(userID)
+	userEntityUUID, err := uuid.FromBytes(rawUserEntityID)
+	assert.NoError(t, err, "should return a UUID")
+	assert.Equal(t, "8c0ac353-406f-5c08-845d-b72779779a42", userEntityUUID.String())
+}