fix: update duration validation to use strfmt package

pkg/validator/validator.go

@@ -5,6 +5,10 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"io"
+	"os"
+	"strings"
+
 	jsonschema "github.com/santhosh-tekuri/jsonschema/v6"
 	"github.com/yannh/kubeconform/pkg/cache"
 	"github.com/yannh/kubeconform/pkg/loader"
@@ -12,11 +16,8 @@ import (
 	"github.com/yannh/kubeconform/pkg/resource"
 	"golang.org/x/text/language"
 	"golang.org/x/text/message"
-	"io"
-	"os"
+	"k8s.io/kube-openapi/pkg/validation/strfmt"
 	"sigs.k8s.io/yaml"
-	"strings"
-	"time"
 )
 
 // Different types of validation results
@@ -292,7 +293,7 @@ func (val *v) Validate(filename string, r io.ReadCloser) []Result {
 // https://github.com/kubernetes/apiextensions-apiserver/blob/1ecd29f74da0639e2e6e3b8fac0c9bfd217e05eb/pkg/apis/apiextensions/v1/types_jsonschema.go#L71
 func validateDuration(v any) error {
 	// Try validation with the Go duration format
-	if _, err := time.ParseDuration(v.(string)); err == nil {
+	if _, err := strfmt.ParseDuration(v.(string)); err == nil {
 		return nil
 	}
 

pkg/validator/validator_test.go

@@ -2,12 +2,13 @@ package validator
 
 import (
 	"bytes"
-	"github.com/santhosh-tekuri/jsonschema/v6"
-	"github.com/yannh/kubeconform/pkg/loader"
 	"io"
 	"reflect"
 	"testing"
 
+	"github.com/santhosh-tekuri/jsonschema/v6"
+	"github.com/yannh/kubeconform/pkg/loader"
+
 	"github.com/yannh/kubeconform/pkg/registry"
 
 	"github.com/yannh/kubeconform/pkg/resource"
@@ -385,6 +386,33 @@ lastName: bar
 kind: name
 apiVersion: v1
 interval: 5s
+`),
+			[]byte(`{
+  "title": "Example Schema",
+  "type": "object",
+  "properties": {
+    "kind": {
+      "type": "string"
+    },
+	"interval": {
+      "type": "string",
+	  "format": "duration"
+    }
+  },
+  "required": ["interval"]
+}`),
+			nil,
+			false,
+			false,
+			Valid,
+			[]ValidationError{},
+		},
+		{
+			"valid resource duration - scala duration format",
+			[]byte(`
+kind: name
+apiVersion: v1
+interval: 2w
 `),
 			[]byte(`{
   "title": "Example Schema",