rbd: implement pv key rotation

This patch implements the EncryptionKeyRotation spec for ceph-csi

Signed-off-by: Niraj Yadav <niryadav@redhat.com>

internal/util/file/file.go

@@ -0,0 +1,54 @@
+/*
+Copyright 2024 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 file
+
+import (
+	"fmt"
+	"os"
+)
+
+// CreateTempFile create a temporary file with the given string
+// content and returns the reference to the file.
+// The caller is responsible for disposing the file.
+func CreateTempFile(prefix, contents string) (*os.File, error) {
+	// Create a temp file
+	file, err := os.CreateTemp("", prefix)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create temporary file: %w", err)
+	}
+
+	// In case of error, remove the file if it was created
+	defer func() {
+		if err != nil {
+			_ = os.Remove(file.Name())
+		}
+	}()
+
+	// Write the contents
+	var c int
+	c, err = file.WriteString(contents)
+	if err != nil || c != len(contents) {
+		return nil, fmt.Errorf("failed to write temporary file: %w", err)
+	}
+
+	// Close the handle
+	if err = file.Close(); err != nil {
+		return nil, fmt.Errorf("failed to close temporary file: %w", err)
+	}
+
+	return file, nil
+}

internal/util/file/file_test.go

@@ -0,0 +1,100 @@
+/*
+Copyright 2024 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 file
+
+import (
+	"os"
+	"testing"
+)
+
+func TestCreateTempFile_WithValidContent(t *testing.T) {
+	t.Parallel()
+
+	content := "Valid Content"
+
+	file, err := CreateTempFile("test-", content)
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	defer func() {
+		err = os.Remove(file.Name())
+		if err != nil {
+			t.Fatalf("Unexpected error: %v", err)
+		}
+	}()
+
+	readContent, err := os.ReadFile(file.Name())
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+
+	if string(readContent) != content {
+		t.Fatalf("Content mismatch: got %v, want %v", string(readContent), content)
+	}
+}
+
+func TestCreateTempFile_WithEmptyContent(t *testing.T) {
+	t.Parallel()
+
+	content := ""
+
+	file, err := CreateTempFile("test-", content)
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	defer func() {
+		err = os.Remove(file.Name())
+		if err != nil {
+			t.Fatalf("Unexpected error: %v", err)
+		}
+	}()
+
+	readContent, err := os.ReadFile(file.Name())
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+
+	if string(readContent) != content {
+		t.Fatalf("Content mismatch: got %v, want %v", string(readContent), content)
+	}
+}
+
+func TestCreateTempFile_WithLargeContent(t *testing.T) {
+	t.Parallel()
+
+	content := string(make([]byte, 1<<20))
+
+	file, err := CreateTempFile("test-", content)
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+	defer func() {
+		err = os.Remove(file.Name())
+		if err != nil {
+			t.Fatalf("Unexpected error: %v", err)
+		}
+	}()
+
+	readContent, err := os.ReadFile(file.Name())
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+
+	if string(readContent) != content {
+		t.Fatalf("Content mismatch: got %v, want %v", string(readContent), content)
+	}
+}