| // Copyright 2017 The Upspin Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package frontend |
| |
| import ( |
| "net/http" |
| "strconv" |
| "strings" |
| ) |
| |
| // redirectHandler redirects requests from prefix/something to target/something. |
| // It rejects non-empty values of "something" that don't parse as int. |
| func redirectHandler(prefix, target string) http.Handler { |
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| suffix := strings.TrimPrefix(r.URL.Path, prefix) |
| if suffix != "" { |
| if _, err := strconv.Atoi(suffix); err != nil { |
| http.NotFound(w, r) |
| return |
| } |
| } |
| http.Redirect(w, r, target+suffix, http.StatusFound) |
| }) |
| } |
