如何优雅地处理用户下载后生成的临时文件

import "os"

// filename 是待删除文件的完整路径
err := os.Remove(filename)
if err != nil {
    // 处理错误，例如文件不存在、权限不足等
    // log.Printf("Failed to delete file %s: %v", filename, err)
}

$.fileDownload('/url/to/download.zip', {
    successCallback: function (url) {
        // 下载成功后，向服务器发送一个异步请求，通知其删除临时文件
        $.ajax({
            url: '/api/delete-temp-file', // 服务器端删除文件的API接口
            type: 'POST',
            data: { fileUrl: url }, // 可以传递文件标识或路径
            success: function(response) {
                console.log('Temporary file deletion request sent successfully.');
            },
            error: function(xhr, status, error) {
                console.error('Failed to send temporary file deletion request:', error);
            }
        });
    },
    failCallback: function (html, url) {
        // 处理下载失败的情况，例如显示错误消息
        console.error('File download failed for:', url);
    }
});

// 假设这是一个Beego控制器的方法
func (c *MainController) DeleteTempFile() {
    fileUrl := c.GetString("fileUrl") // 获取客户端传递的文件URL或标识
    // 根据fileUrl解析出服务器上的实际文件路径
    // 注意：这里需要严格验证fileUrl，防止路径遍历攻击或其他安全问题
    // 确保只删除应用生成的临时文件，而不是任意文件

    // 示例：假设fileUrl是文件在服务器上的相对路径，需要转换为绝对路径
    filePath := filepath.Join("path/to/your/temp/directory", filepath.Base(fileUrl))

    err := os.Remove(filePath)
    if err != nil {
        c.Ctx.Output.SetStatus(500)
        c.Ctx.Output.Body([]byte("Failed to delete file"))
        // 记录错误日志
        return
    }
    c.Ctx.Output.SetStatus(200)
    c.Ctx.Output.Body([]byte("File deleted successfully"))
}

package main

import (
    "archive/zip"
    "fmt"
    "io"
    "net/http"
)

func generateAndStreamZip(w http.ResponseWriter, r *http.Request) {
    w.Header().Set("Content-Type", "application/zip")
    w.Header().Set("Content-Disposition", "attachment; filename=\"dynamic_files.zip\"")

    zipWriter := zip.NewWriter(w)
    defer zipWriter.Close() // 确保关闭zipWriter以刷新所有内容

    // 添加第一个文件
    file1, err := zipWriter.Create("hello.txt")
    if err != nil {
        http.Error(w, "Failed to create zip entry", http.StatusInternalServerError)
        return
    }
    _, err = file1.Write([]byte("Hello, this is file 1 content."))
    if err != nil {
        http.Error(w, "Failed to write to zip entry", http.StatusInternalServerError)
        return
    }

    // 添加第二个文件
    file2, err := zipWriter.Create("data.csv")
    if err != nil {
        http.Error(w, "Failed to create zip entry", http.StatusInternalServerError)
        return
    }
    _, err = file2.Write([]byte("col1,col2\nval1,val2\n"))
    if err != nil {
        http.Error(w, "Failed to write to zip entry", http.StatusInternalServerError)
        return
    }

    // 如果有更多文件，继续添加
    fmt.Println("Zip content streamed successfully.")
}

func main() {
    http.HandleFunc("/download-zip", generateAndStreamZip)
    fmt.Println("Server listening on :8080")
    http.ListenAndServe(":8080", nil)
}