util: add helper function to strip kube parameters

added helper function to strip the kubernetes
specific parameters from the volumeContext as
volumeContext is storaged in the PV volumeAttributes

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

internal/util/k8s/parameters.go

@@ -0,0 +1,39 @@
+/*
+Copyright 2022 The Ceph-CSI Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+package k8s
+
+import (
+	"strings"
+)
+
+// CSI Parameters prefixed with csiParameterPrefix are passed through
+// to the driver on CreateVolumeRequest/CreateSnapshotRequest calls.
+const (
+	csiParameterPrefix = "csi.storage.k8s.io/"
+)
+
+// RemoveCSIPrefixedParameters removes parameters prefixed with csiParameterPrefix.
+func RemoveCSIPrefixedParameters(param map[string]string) map[string]string {
+	newParam := map[string]string{}
+	for k, v := range param {
+		if !strings.HasPrefix(k, csiParameterPrefix) {
+			// add the parameter to the new map if its not having the prefix
+			newParam[k] = v
+		}
+	}
+
+	return newParam
+}

internal/util/k8s/parameters_test.go

@@ -0,0 +1,62 @@
+/*
+Copyright 2022 The Ceph-CSI Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+package k8s
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestRemoveCSIPrefixedParameters(t *testing.T) {
+	t.Parallel()
+	tests := []struct {
+		name  string
+		param map[string]string
+		want  map[string]string
+	}{
+		{
+			name: "without csi.storage.k8s.io prefix",
+			param: map[string]string{
+				"foo": "bar",
+			},
+			want: map[string]string{
+				"foo": "bar",
+			},
+		},
+		{
+			name: "with csi.storage.k8s.io prefix",
+			param: map[string]string{
+				"foo":                              "bar",
+				"csi.storage.k8s.io/pvc/name":      "foo",
+				"csi.storage.k8s.io/pvc/namespace": "bar",
+				"csi.storage.k8s.io/pv/name":       "baz",
+			},
+			want: map[string]string{
+				"foo": "bar",
+			},
+		},
+	}
+	for _, tt := range tests {
+		ts := tt
+		t.Run(ts.name, func(t *testing.T) {
+			t.Parallel()
+			got := RemoveCSIPrefixedParameters(ts.param)
+			if !reflect.DeepEqual(got, ts.want) {
+				t.Errorf("RemoveCSIPrefixedParameters() = %v, want %v", got, ts.want)
+			}
+		})
+	}
+}