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tailscale/tailfs/tailfsimpl/compositedav/propfind.go

85 lines
1.9 KiB
Go

// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package compositedav
import (
"bytes"
"fmt"
"math"
"net/http"
"regexp"
"tailscale.com/tailfs/tailfsimpl/shared"
)
var (
hrefRegex = regexp.MustCompile(`(?s)<D:href>/?([^<]*)/?</D:href>`)
)
func (h *Handler) handlePROPFIND(w http.ResponseWriter, r *http.Request) {
pathComponents := shared.CleanAndSplit(r.URL.Path)
mpl := h.maxPathLength(r)
if !shared.IsRoot(r.URL.Path) && len(pathComponents)+getDepth(r) > mpl {
// Delegate to a Child.
depth := getDepth(r)
cached := h.StatCache.get(r.URL.Path, depth)
if cached != nil {
w.Header().Del("Content-Length")
w.WriteHeader(http.StatusMultiStatus)
w.Write(cached)
return
}
// Use a buffering ResponseWriter so that we can manipulate the result.
// The only thing we use from the original ResponseWriter is Header().
bw := &bufferingResponseWriter{ResponseWriter: w}
mpl := h.maxPathLength(r)
h.delegate(pathComponents[mpl-1:], bw, r)
// Fixup paths to add the requested path as a prefix.
pathPrefix := shared.Join(pathComponents[0:mpl]...)
b := hrefRegex.ReplaceAll(bw.buf.Bytes(), []byte(fmt.Sprintf("<D:href>%s/$1</D:href>", pathPrefix)))
if h.StatCache != nil && bw.status == http.StatusMultiStatus && b != nil {
h.StatCache.set(r.URL.Path, depth, b)
}
w.Header().Del("Content-Length")
w.WriteHeader(bw.status)
w.Write(b)
return
}
h.handle(w, r)
}
func getDepth(r *http.Request) int {
switch r.Header.Get("Depth") {
case "0":
return 0
case "1":
return 1
case "infinity":
return math.MaxInt
}
return 0
}
type bufferingResponseWriter struct {
http.ResponseWriter
status int
buf bytes.Buffer
}
func (bw *bufferingResponseWriter) WriteHeader(statusCode int) {
bw.status = statusCode
}
func (bw *bufferingResponseWriter) Write(p []byte) (int, error) {
return bw.buf.Write(p)
}