tag filter supports selecting both included and excluded tags simultaneously

pkg/validators/tag_filter.go

@@ -0,0 +1,26 @@
+package validators
+
+import (
+	"github.com/go-playground/validator/v10"
+
+	"github.com/mayswind/ezbookkeeping/pkg/models"
+)
+
+// ValidTagFilter returns whether the given tag filter is valid
+func ValidTagFilter(fl validator.FieldLevel) bool {
+	if value, ok := fl.Field().Interface().(string); ok {
+		if value == "" {
+			return true
+		}
+
+		if value == models.TransactionNoTagFilterValue {
+			return true
+		}
+
+		_, err := models.ParseTransactionTagFilter(value)
+
+		return err == nil
+	}
+
+	return false
+}

pkg/validators/tag_filter_test.go

@@ -0,0 +1,104 @@
+package validators
+
+import (
+	"testing"
+
+	"github.com/go-playground/validator/v10"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestEmptyTagFilter(t *testing.T) {
+	validate := validator.New()
+	err := validate.RegisterValidation("validTagFilter", ValidTagFilter)
+	assert.Nil(t, err)
+
+	err = validate.Var("", "validTagFilter")
+	assert.Nil(t, err)
+}
+
+func TestNoTag(t *testing.T) {
+	validate := validator.New()
+	err := validate.RegisterValidation("validTagFilter", ValidTagFilter)
+	assert.Nil(t, err)
+
+	err = validate.Var("none", "validTagFilter")
+	assert.Nil(t, err)
+}
+
+func TestNoValidFilter(t *testing.T) {
+	validate := validator.New()
+	err := validate.RegisterValidation("validTagFilter", ValidTagFilter)
+	assert.Nil(t, err)
+
+	err = validate.Var(";", "validTagFilter")
+	assert.NotNil(t, err)
+
+	err = validate.Var(";;", "validTagFilter")
+	assert.NotNil(t, err)
+}
+
+func TestValidOneFilterInTagFilters(t *testing.T) {
+	validate := validator.New()
+	err := validate.RegisterValidation("validTagFilter", ValidTagFilter)
+	assert.Nil(t, err)
+
+	err = validate.Var("0:1", "validTagFilter")
+	assert.Nil(t, err)
+
+	err = validate.Var("0:1,2,3", "validTagFilter")
+	assert.Nil(t, err)
+
+	err = validate.Var("1:1,2,3", "validTagFilter")
+	assert.Nil(t, err)
+
+	err = validate.Var("2:1,2,3", "validTagFilter")
+	assert.Nil(t, err)
+
+	err = validate.Var("3:1,2,3", "validTagFilter")
+	assert.Nil(t, err)
+}
+
+func TestInvalidTagFilterType(t *testing.T) {
+	validate := validator.New()
+	err := validate.RegisterValidation("validTagFilter", ValidTagFilter)
+	assert.Nil(t, err)
+
+	err = validate.Var("a:1,2,3", "validTagFilter")
+	assert.NotNil(t, err)
+
+	err = validate.Var("-1:1,2,3", "validTagFilter")
+	assert.NotNil(t, err)
+
+	err = validate.Var("4:1,2,3", "validTagFilter")
+	assert.NotNil(t, err)
+}
+
+func TestNoTagIdsInFilter(t *testing.T) {
+	validate := validator.New()
+	err := validate.RegisterValidation("validTagFilter", ValidTagFilter)
+	assert.Nil(t, err)
+
+	err = validate.Var("0", "validTagFilter")
+	assert.NotNil(t, err)
+
+	err = validate.Var("0:", "validTagFilter")
+	assert.NotNil(t, err)
+}
+
+func TestInvalidTagIdsInFilter(t *testing.T) {
+	validate := validator.New()
+	err := validate.RegisterValidation("validTagFilter", ValidTagFilter)
+	assert.Nil(t, err)
+
+	err = validate.Var("0:abc", "validTagFilter")
+	assert.NotNil(t, err)
+}
+
+func TestValidTwoFilterInTagFilters(t *testing.T) {
+	validate := validator.New()
+	err := validate.RegisterValidation("validTagFilter", ValidTagFilter)
+	assert.Nil(t, err)
+
+	err = validate.Var("0:1,2,3;2:4,5,6", "validTagFilter")
+	assert.Nil(t, err)
+}