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Fix macOS Finder WebDAV mount by handling GET on directories (#12)

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Go's webdav.Handler returns 405 Method Not Allowed for GET on
collections (directories). macOS Finder sends GET to the WebDAV root
as part of its mount flow and refuses to connect when it gets 405.

Add a finderCompatible wrapper that intercepts GET/HEAD on directories
and returns a minimal 200 response, while passing all standard WebDAV
methods through to the underlying handler unchanged.
This commit is contained in:
Hari 2026-04-01 16:42:34 -04:00 • committed by GitHub
parent b74db855c8
commit 18b6ac625f
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2 changed files with 63 additions and 2 deletions
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5
apps/node-agent/cmd/node-agent/app.go
View file

@ -155,12 +155,13 @@ func (a *app) handler() http.Handler {
for _, mount := range a.exportMounts {
mountPathPrefix := strings.TrimSuffix(mount.mountPath, "/")
fs := webdav.Dir(mount.exportPath)
dav := &webdav.Handler{
Prefix: mountPathPrefix,
FileSystem: webdav.Dir(mount.exportPath),
FileSystem: fs,
LockSystem: webdav.NewMemLS(),
}
mux.Handle(mount.mountPath, a.requireDAVAuth(mount, dav))
mux.Handle(mount.mountPath, a.requireDAVAuth(mount, finderCompatible(dav, fs, mountPathPrefix)))
}
return mux

60
apps/node-agent/cmd/node-agent/dav_finder.go Normal file
View file

@ -0,0 +1,60 @@
package main
import (
"context"
"net/http"
"os"
"strings"
"golang.org/x/net/webdav"
)
// finderCompatible wraps a webdav.Handler to work around macOS Finder quirks.
//
// Finder sends GET requests to WebDAV collection (directory) URLs and expects
// a 200 response. The standard Go webdav.Handler returns 405 Method Not Allowed
// for GET on directories, which causes Finder to refuse the mount.
//
// This wrapper intercepts GET and HEAD requests on directories and returns a
// minimal 200 response so Finder proceeds with the WebDAV protocol.
func finderCompatible(dav *webdav.Handler, fs webdav.FileSystem, prefix string) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodGet && r.Method != http.MethodHead {
dav.ServeHTTP(w, r)
return
}
// Strip the prefix to get the filesystem-relative path.
fsPath := strings.TrimPrefix(r.URL.Path, prefix)
if fsPath == "" {
fsPath = "/"
}
f, err := fs.OpenFile(context.Background(), fsPath, os.O_RDONLY, 0)
if err != nil {
// Not found or other error: let the regular handler deal with it.
dav.ServeHTTP(w, r)
return
}
defer f.Close()
info, err := f.Stat()
if err != nil {
dav.ServeHTTP(w, r)
return
}
if !info.IsDir() {
// Regular file: let the standard handler serve it.
dav.ServeHTTP(w, r)
return
}
// Directory GET: return a minimal 200 so Finder is satisfied.
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.WriteHeader(http.StatusOK)
if r.Method == http.MethodGet {
_, _ = w.Write([]byte("<!DOCTYPE html><html><body><p>betterNAS WebDAV</p></body></html>\n"))
}
})
}