72 lines
1.8 KiB
Go
72 lines
1.8 KiB
Go
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package handler
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import (
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"crypto/rand"
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"encoding/hex"
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"io"
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"net/http"
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"os"
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"path/filepath"
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"strings"
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"time"
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)
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// saveUploadFile 保存上传文件（工艺图纸PDF / 巡检照片），返回生成的文件名
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func saveUploadFile(r *http.Request, field, dir string) (string, error) {
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if err := os.MkdirAll(dir, 0o755); err != nil {
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return "", err
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}
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file, header, err := r.FormFile(field)
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if err != nil {
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return "", err
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}
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defer file.Close()
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ext := strings.ToLower(filepath.Ext(header.Filename))
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if ext == "" {
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ext = ".bin"
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}
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name := time.Now().Format("20060102150405") + "_" + randHex(6) + ext
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dst, err := os.Create(filepath.Join(dir, name))
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if err != nil {
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return "", err
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}
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defer dst.Close()
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if _, err := io.Copy(dst, file); err != nil {
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return "", err
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}
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return name, nil
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}
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func randHex(n int) string {
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b := make([]byte, n)
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_, _ = rand.Read(b)
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return hex.EncodeToString(b)[:n*2]
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}
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// serveUploadFile 下发上传目录中的文件（限制为单段文件名，防路径穿越）
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func serveUploadFile(w http.ResponseWriter, r *http.Request, dir, name string) {
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name = strings.TrimSpace(filepath.Base(name))
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if name == "" || name == "." || name == ".." || strings.Contains(name, "..") {
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http.Error(w, "非法文件名", http.StatusBadRequest)
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return
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}
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f, err := os.Open(filepath.Join(dir, name))
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if err != nil {
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http.Error(w, "文件不存在", http.StatusNotFound)
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return
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}
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defer f.Close()
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ct := "application/octet-stream"
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switch {
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case strings.HasSuffix(strings.ToLower(name), ".pdf"):
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ct = "application/pdf"
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case strings.HasSuffix(strings.ToLower(name), ".jpg"), strings.HasSuffix(strings.ToLower(name), ".jpeg"):
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ct = "image/jpeg"
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case strings.HasSuffix(strings.ToLower(name), ".png"):
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ct = "image/png"
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}
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w.Header().Set("Content-Type", ct)
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http.ServeContent(w, r, name, time.Time{}, f)
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}
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