util: add helper to get pvcnamespace from input

added helper function to return the pvc namespace
name from the input parameters.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

internal/util/k8s/parameters.go

@@ -23,6 +23,7 @@ import (
 // to the driver on CreateVolumeRequest/CreateSnapshotRequest calls.
 const (
 	csiParameterPrefix = "csi.storage.k8s.io/"
+	pvcNamespaceKey    = "csi.storage.k8s.io/pvc/namespace"
 )
 
 // RemoveCSIPrefixedParameters removes parameters prefixed with csiParameterPrefix.
@@ -37,3 +38,8 @@ func RemoveCSIPrefixedParameters(param map[string]string) map[string]string {
 
 	return newParam
 }
+
+// GetOwner returns the pvc namespace name from the parameter.
+func GetOwner(param map[string]string) string {
+	return param[pvcNamespaceKey]
+}

internal/util/k8s/parameters_test.go

@@ -60,3 +60,36 @@ func TestRemoveCSIPrefixedParameters(t *testing.T) {
 		})
 	}
 }
+
+func TestGetOwner(t *testing.T) {
+	t.Parallel()
+	tests := []struct {
+		name string
+		args map[string]string
+		want string
+	}{
+		{
+			name: "namespace is not present in the parameters",
+			args: map[string]string{
+				"foo": "bar",
+			},
+			want: "",
+		},
+		{
+			name: "namespace is present in the parameters",
+			args: map[string]string{
+				"csi.storage.k8s.io/pvc/namespace": "bar",
+			},
+			want: "bar",
+		},
+	}
+	for _, tt := range tests {
+		ts := tt
+		t.Run(ts.name, func(t *testing.T) {
+			t.Parallel()
+			if got := GetOwner(ts.args); got != ts.want {
+				t.Errorf("GetOwner() = %v, want %v", got, ts.want)
+			}
+		})
+	}
+}