2017-09-23 13:56:58 +08:00
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// Copyright 2015 Light Code Labs, LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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2016-06-06 11:51:56 +08:00
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// Package redirect is middleware for redirecting certain requests
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// to other locations.
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package redirect
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import (
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"fmt"
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"html"
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"net/http"
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"github.com/mholt/caddy/caddyhttp/httpserver"
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)
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// Redirect is middleware to respond with HTTP redirects
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type Redirect struct {
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Next httpserver.Handler
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Rules []Rule
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}
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// ServeHTTP implements the httpserver.Handler interface.
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func (rd Redirect) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
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for _, rule := range rd.Rules {
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2016-06-21 22:59:29 +08:00
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if (rule.FromPath == "/" || r.URL.Path == rule.FromPath) && schemeMatches(rule, r) && rule.Match(r) {
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2016-06-06 11:51:56 +08:00
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to := httpserver.NewReplacer(r, nil, "").Replace(rule.To)
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if rule.Meta {
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safeTo := html.EscapeString(to)
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fmt.Fprintf(w, metaRedir, safeTo, safeTo)
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} else {
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http.Redirect(w, r, to, rule.Code)
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}
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return 0, nil
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}
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}
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return rd.Next.ServeHTTP(w, r)
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}
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func schemeMatches(rule Rule, req *http.Request) bool {
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2017-01-21 09:51:31 +08:00
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return (rule.FromScheme() == "https" && req.TLS != nil) ||
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(rule.FromScheme() != "https" && req.TLS == nil)
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2016-06-06 11:51:56 +08:00
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}
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// Rule describes an HTTP redirect rule.
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type Rule struct {
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2017-01-21 09:51:31 +08:00
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FromScheme func() string
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FromPath, To string
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Code int
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Meta bool
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2016-06-21 22:59:29 +08:00
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httpserver.RequestMatcher
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2016-06-06 11:51:56 +08:00
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}
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// Script tag comes first since that will better imitate a redirect in the browser's
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// history, but the meta tag is a fallback for most non-JS clients.
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const metaRedir = `<!DOCTYPE html>
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<html>
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<head>
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<script>window.location.replace("%s");</script>
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<meta http-equiv="refresh" content="0; URL='%s'">
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</head>
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<body>Redirecting...</body>
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</html>
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`
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