Fixes panics on non-string YAML keys

This resolves #91 and
#98

fixtures/unconventional_keys.yaml

@@ -0,0 +1,8 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: unconventional-keys
+data:
+  5: "integer"
+  3.14: "float"
+  true: "boolean"

kubeval/kubeval_test.go

@@ -28,6 +28,7 @@ func TestValidateValidInputs(t *testing.T) {
 		"quantity.yaml",
 		"extra_property.yaml",
 		"full_domain_group.yaml",
+		"unconventional_keys.yaml",
 	}
 	for _, test := range tests {
 		filePath, _ := filepath.Abs("../fixtures/" + test)
@@ -51,6 +52,7 @@ func TestValidateValidInputsWithCache(t *testing.T) {
 		"quantity.yaml",
 		"extra_property.yaml",
 		"full_domain_group.yaml",
+		"unconventional_keys.yaml",
 	}
 	schemaCache := make(map[string]*gojsonschema.Schema, 0)
 
@@ -89,7 +91,6 @@ func TestStrictCatchesAdditionalErrors(t *testing.T) {
 	}
 }
 
-
 func TestValidateMultipleVersions(t *testing.T) {
 	Strict = true
 	Version = "1.14.0"
@@ -171,4 +172,3 @@ func TestSkipCrdSchemaMiss(t *testing.T) {
 		t.Errorf("For custom CRD's with schema missing we should skip with SkipCrdSchemaMiss flag")
 	}
 }
-

kubeval/utils.go

@@ -1,5 +1,7 @@
 package kubeval
 
+import "fmt"
+
 // Based on https://stackoverflow.com/questions/40737122/convert-yaml-to-json-without-struct-golang
 // We unmarshal yaml into a value of type interface{},
 // go through the result recursively, and convert each encountered
@@ -10,7 +12,7 @@ func convertToStringKeys(i interface{}) interface{} {
 	case map[interface{}]interface{}:
 		m2 := map[string]interface{}{}
 		for k, v := range x {
-			m2[k.(string)] = convertToStringKeys(v)
+			m2[fmt.Sprintf("%v", k)] = convertToStringKeys(v)
 		}
 		return m2
 	case []interface{}: