Add File utility to create, write, move, and remove temporary files

internal/pkg/file.go

@@ -0,0 +1,51 @@
+package pkg
+
+import (
+	"crypto/rand"
+	"os"
+	"path/filepath"
+	"time"
+)
+
+type File struct {
+	filepath string
+	file     *os.File
+
+	isMoved bool
+}
+
+func CreateRandomTmpFile(dir string) (*File, error) {
+	if err := os.MkdirAll(dir, 0750); err != nil {
+		return nil, err
+	}
+	tmpFile := filepath.Join(dir, time.Now().Format(time.RFC3339)+"_"+rand.Text()+".tmp")
+	file, err := os.Create(tmpFile)
+	if err != nil {
+		return nil, err
+	}
+
+	return &File{
+		filepath: tmpFile,
+		file:     file,
+	}, nil
+}
+
+func (f *File) Write(p []byte) (n int, err error) {
+	return f.file.Write(p)
+}
+
+func (f *File) Path() string {
+	return f.filepath
+}
+
+func (f *File) Remove() error {
+	if f.isMoved {
+		return nil
+	}
+
+	return os.Remove(f.filepath)
+}
+
+func (f *File) Move(path string) error {
+	return os.Rename(f.filepath, path)
+}