Fix unmarshalling for configvarstring (#1413)

Signed-off-by: Waleed Malik <[email protected]>

Signed-off-by: Waleed Malik <[email protected]>
Co-authored-by: Waleed Malik <[email protected]>

Author: kubermatic-bot

pkg/providerconfig/types/types.go

@@ -21,6 +21,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"strconv"
 
 	clusterv1alpha1 "github.com/kubermatic/machine-controller/pkg/apis/cluster/v1alpha1"
 	"github.com/kubermatic/machine-controller/pkg/jsonutil"
@@ -204,7 +205,16 @@ func (configVarString *ConfigVarString) UnmarshalJSON(b []byte) error {
 	if !bytes.HasPrefix(b, []byte("{")) {
 		b = bytes.TrimPrefix(b, []byte(`"`))
 		b = bytes.TrimSuffix(b, []byte(`"`))
-		configVarString.Value = string(b)
+
+		// `Unquote` expects the input string to be inside quotation marks.
+		//  Since we can have a string without any quotations, in which case `TrimPrefix` and
+		// `TrimSuffix` will be noop. We explicitly add quotation marks to the input string
+		// to make sure that `Unquote` never fails.
+		s, err := strconv.Unquote("\"" + string(b) + "\"")
+		if err != nil {
+			return err
+		}
+		configVarString.Value = s
 		return nil
 	}
 	// This type must have the same fields as ConfigVarString but not

pkg/providerconfig/types/types_test.go

@@ -21,7 +21,7 @@ import (
 	"reflect"
 	"testing"
 
-	"k8s.io/api/core/v1"
+	v1 "k8s.io/api/core/v1"
 	"k8s.io/utils/pointer"
 )
 
@@ -163,6 +163,7 @@ func TestConfigVarStringMarshallingAndUnmarshalling(t *testing.T) {
 
 	testCases := []ConfigVarString{
 		{Value: "val"},
+		{Value: "spe<ialv&lue"},
 		{SecretKeyRef: GlobalSecretKeySelector{ObjectReference: v1.ObjectReference{Namespace: "ns", Name: "name"}, Key: "key"}},
 		{Value: "val", SecretKeyRef: GlobalSecretKeySelector{ObjectReference: v1.ObjectReference{Namespace: "ns", Name: "name"}, Key: "key"}},
 		{ConfigMapKeyRef: GlobalConfigMapKeySelector{ObjectReference: v1.ObjectReference{Namespace: "ns", Name: "name"}, Key: "key"}},
@@ -175,6 +176,11 @@ func TestConfigVarStringMarshallingAndUnmarshalling(t *testing.T) {
 			ConfigMapKeyRef: GlobalConfigMapKeySelector{ObjectReference: v1.ObjectReference{Namespace: "ns", Name: "name"}, Key: "key"},
 			SecretKeyRef:    GlobalSecretKeySelector{ObjectReference: v1.ObjectReference{Namespace: "ns", Name: "name"}, Key: "key"},
 		},
+		{
+			Value:           "spe<ialv&lue",
+			ConfigMapKeyRef: GlobalConfigMapKeySelector{ObjectReference: v1.ObjectReference{Namespace: "ns", Name: "name"}, Key: "key"},
+			SecretKeyRef:    GlobalSecretKeySelector{ObjectReference: v1.ObjectReference{Namespace: "ns", Name: "name"}, Key: "key"},
+		},
 	}
 
 	for _, cvs := range testCases {