webdav: add a litmus test server.

Change-Id: I1e109180673cf3caff4413d12b77422bb072ac50
Reviewed-on: https://go-review.googlesource.com/2950Reviewed-by: Dave Cheney <dave@cheney.net>
Reviewed-by: Nick Cooper <nmvc@google.com>

webdav/litmus_test_server.go

+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build ignore
+
+/*
+This program is a server for the WebDAV 'litmus' compliance test at
+http://www.webdav.org/neon/litmus/
+To run the test:
+
+go run litmus_test_server.go
+
+and separately, from the downloaded litmus-xxx directory:
+
+make URL=http://localhost:9999/ check
+*/
+package main
+
+import (
+	"log"
+	"net/http"
+	"net/url"
+
+	"golang.org/x/net/webdav"
+)
+
+func main() {
+	http.Handle("/", &webdav.Handler{
+		FileSystem: webdav.NewMemFS(),
+		LockSystem: webdav.NewMemLS(),
+		Logger: func(r *http.Request, err error) {
+			switch r.Method {
+			case "COPY", "MOVE":
+				dst := ""
+				if u, err := url.Parse(r.Header.Get("Destination")); err == nil {
+					dst = u.Path
+				}
+				ow := r.Header.Get("Overwrite")
+				log.Printf("%-8s%-25s%-25sow=%-2s%v", r.Method, r.URL.Path, dst, ow, err)
+			default:
+				log.Printf("%-8s%-30s%v", r.Method, r.URL.Path, err)
+			}
+		},
+	})
+
+	const addr = ":9999"
+	log.Printf("Serving %v", addr)
+	log.Fatal(http.ListenAndServe(addr, nil))
+}