package main
import (
"log"
"net/http"
"os"
"path/filepath"
"golang.org/x/net/webdav"
)
const (
rootDir = "/data"
addr = ":80"
)
func main() {
if err := os.MkdirAll(rootDir, 0o777); err != nil {
log.Fatalf("mkdir %s: %v", rootDir, err)
}
abs, err := filepath.Abs(rootDir)
if err != nil {
log.Fatalf("abs %s: %v", rootDir, err)
}
var fs webdav.FileSystem = webdav.Dir(abs)
if os.Getenv("WEBDAV_IMAGES_ONLY") == "1" {
fs = &imageOnlyFS{FileSystem: fs}
log.Print("WebDAV images-only mode: only image and SVG uploads allowed")
}
h := &webdav.Handler{
FileSystem: fs,
LockSystem: webdav.NewMemLS(),
}
// Wrap so GET / returns a simple page instead of 403 for directory
http.Handle("/", &rootGETWrapper{Handler: h})
log.Printf("WebDAV listening on %s (root %s)", addr, abs)
if err := http.ListenAndServe(addr, nil); err != nil {
log.Fatalf("listen: %v", err)
}
}
// rootGETWrapper serves a minimal HTML page for GET / and passes everything else to WebDAV.
type rootGETWrapper struct {
*webdav.Handler
}
func (w *rootGETWrapper) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
if r.Method == http.MethodGet && (r.URL.Path == "" || r.URL.Path == "/") {
rw.Header().Set("Content-Type", "text/html; charset=utf-8")
rw.WriteHeader(http.StatusOK)
host := r.Host
rw.Write([]byte(`WebDAVWebDAV
Mac
Finder → Go → Connect to Server… (⌘K) → https://` + host + `
Windows
File Explorer → right-click This PC → Map network drive → Choose a drive letter → Folder: https://` + host + ` → Finish (use the same login when prompted).
Or: File Explorer → This PC → Computer tab → Map network drive.
`))
return
}
w.Handler.ServeHTTP(rw, r)
}