81 lines
2.6 KiB
Go
81 lines
2.6 KiB
Go
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package agent
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import (
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"encoding/json"
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"errors"
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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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)
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// frps 的 custom404Page 只认 VPS 上的文件路径，所以「自定义 404 页面内容」必须先把内容
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// 落到 VPS 上。这里给 Havline 一个受控的写文件入口：只写绝对路径、只写 .html，避免变成
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// 任意文件写入。
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type frpsPageRequest struct {
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Path string `json:"path"`
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Content string `json:"content"`
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}
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func (s *Server) putFRPS404Page(w http.ResponseWriter, r *http.Request) {
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var req frpsPageRequest
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if err := json.NewDecoder(http.MaxBytesReader(w, r.Body, 1<<20)).Decode(&req); err != nil {
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writeJSON(w, http.StatusBadRequest, map[string]string{"error": "invalid JSON"})
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return
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}
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path, err := validatePagePath(req.Path)
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if err != nil {
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writeJSON(w, http.StatusBadRequest, map[string]string{"error": err.Error()})
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return
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}
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if strings.TrimSpace(req.Content) == "" {
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writeJSON(w, http.StatusBadRequest, map[string]string{"error": "页面内容为空"})
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return
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}
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if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
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writeJSON(w, http.StatusBadGateway, map[string]string{"error": err.Error()})
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return
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}
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s.mu.Lock()
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defer s.mu.Unlock()
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if err := atomicWrite(path, []byte(req.Content), 0o644); err != nil {
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writeJSON(w, http.StatusBadGateway, map[string]string{"error": err.Error()})
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return
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}
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writeJSON(w, http.StatusOK, map[string]any{"ok": true, "path": path, "bytes": len(req.Content)})
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}
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func (s *Server) deleteFRPS404Page(w http.ResponseWriter, r *http.Request) {
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path, err := validatePagePath(r.URL.Query().Get("path"))
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if err != nil {
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writeJSON(w, http.StatusBadRequest, map[string]string{"error": err.Error()})
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return
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}
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s.mu.Lock()
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defer s.mu.Unlock()
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if err := os.Remove(path); err != nil && !errors.Is(err, os.ErrNotExist) {
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writeJSON(w, http.StatusBadGateway, map[string]string{"error": err.Error()})
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return
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}
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writeJSON(w, http.StatusOK, map[string]any{"ok": true})
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}
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// validatePagePath 只接受绝对路径 + .html/.htm 结尾，防止这个接口被当成任意文件写入。
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func validatePagePath(raw string) (string, error) {
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path := strings.TrimSpace(raw)
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// agent 只跑在 Linux 上，这里按 POSIX 绝对路径判断（用 filepath.IsAbs 会在别的平台判错）
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if path == "" || !strings.HasPrefix(path, "/") {
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return "", errors.New("页面路径必须是绝对路径")
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}
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if strings.Contains(path, "..") {
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return "", errors.New("页面路径不允许包含 ..")
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}
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switch strings.ToLower(filepath.Ext(path)) {
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case ".html", ".htm":
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return filepath.Clean(path), nil
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default:
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return "", errors.New("页面文件必须以 .html 或 .htm 结尾")
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}
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}
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