feat: add Go backend

server/utility/file/file.go

@@ -0,0 +1,103 @@
+// Package file
+// @Link  https://github.com/bufanyun/hotgo
+// @Copyright  Copyright (c) 2023 HotGo CLI
+// @Author  Ms <133814250@qq.com>
+// @License  https://github.com/bufanyun/hotgo/blob/master/LICENSE
+package file
+
+import (
+	"bytes"
+	"hotgo/utility/format"
+	"io"
+	"mime/multipart"
+	"os"
+	"path/filepath"
+
+	"github.com/gogf/gf/v2/os/gfile"
+)
+
+// 文件信息
+type fileInfo struct {
+	name string
+	size int64
+}
+
+// WalkDir 递归获取目录下文件的名称和大小
+func WalkDir(dirname string) (error, []fileInfo) {
+	op, err := filepath.Abs(dirname) // 获取目录的绝对路径
+	if nil != err {
+		return err, nil
+	}
+	files, err := os.ReadDir(op) // 获取目录下所有文件的信息，包括文件和文件夹
+	if nil != err {
+		return err, nil
+	}
+
+	var fileInfos []fileInfo // 返回值，存储读取的文件信息
+	for _, f := range files {
+		if f.IsDir() { // 如果是目录，那么就递归调用
+			err, fs := WalkDir(op + `/` + f.Name()) // 路径分隔符，linux 和 windows 不同
+			if nil != err {
+				return err, nil
+			}
+			fileInfos = append(fileInfos, fs...) // 将 slice 添加到 slice
+		} else {
+			info, err := f.Info()
+			if nil != err {
+				return err, nil
+			}
+			fi := fileInfo{op + `/` + f.Name(), info.Size()}
+			fileInfos = append(fileInfos, fi) // slice 中添加成员
+		}
+	}
+	return nil, fileInfos
+}
+
+// DirSize 获取目录下所有文件大小
+func DirSize(dirname string) string {
+	var (
+		ss       int64
+		_, files = WalkDir(dirname)
+	)
+	for _, n := range files {
+		ss += n.size
+	}
+	return format.FileSize(ss)
+}
+
+func MergeAbs(path string, fileName ...string) string {
+	var paths = []string{gfile.RealPath(path)}
+	paths = append(paths, fileName...)
+	return gfile.Join(paths...)
+}
+
+// NewMultipartFileHeader 创建一个MultipartFileHeader
+func NewMultipartFileHeader(filename string, b []byte) (*multipart.FileHeader, error) {
+	body := &bytes.Buffer{}
+	writer := multipart.NewWriter(body)
+
+	part, err := writer.CreateFormFile("file", filename)
+	if err != nil {
+		return nil, err
+	}
+
+	if _, err = io.Copy(part, bytes.NewReader(b)); err != nil {
+		return nil, err
+	}
+
+	if err = writer.Close(); err != nil {
+		return nil, err
+	}
+
+	reader := multipart.NewReader(body, writer.Boundary())
+	form, err := reader.ReadForm(int64(len(b)) + 1024)
+	if err != nil {
+		return nil, err
+	}
+	defer form.RemoveAll()
+
+	if files, ok := form.File["file"]; ok && len(files) > 0 {
+		return files[0], nil
+	}
+	return nil, io.ErrUnexpectedEOF
+}