mirror of
https://github.com/caddyserver/caddy.git
synced 2024-12-23 22:27:38 -05:00
60 lines
1.5 KiB
Go
60 lines
1.5 KiB
Go
// Package redirect is middleware for redirecting certain requests
|
|
// to other locations.
|
|
package redirect
|
|
|
|
import (
|
|
"fmt"
|
|
"html"
|
|
"net/http"
|
|
|
|
"github.com/mholt/caddy/caddyhttp/httpserver"
|
|
)
|
|
|
|
// Redirect is middleware to respond with HTTP redirects
|
|
type Redirect struct {
|
|
Next httpserver.Handler
|
|
Rules []Rule
|
|
}
|
|
|
|
// ServeHTTP implements the httpserver.Handler interface.
|
|
func (rd Redirect) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
|
|
for _, rule := range rd.Rules {
|
|
if (rule.FromPath == "/" || r.URL.Path == rule.FromPath) && schemeMatches(rule, r) && rule.Match(r) {
|
|
to := httpserver.NewReplacer(r, nil, "").Replace(rule.To)
|
|
if rule.Meta {
|
|
safeTo := html.EscapeString(to)
|
|
fmt.Fprintf(w, metaRedir, safeTo, safeTo)
|
|
} else {
|
|
http.Redirect(w, r, to, rule.Code)
|
|
}
|
|
return 0, nil
|
|
}
|
|
}
|
|
return rd.Next.ServeHTTP(w, r)
|
|
}
|
|
|
|
func schemeMatches(rule Rule, req *http.Request) bool {
|
|
return (rule.FromScheme() == "https" && req.TLS != nil) ||
|
|
(rule.FromScheme() != "https" && req.TLS == nil)
|
|
}
|
|
|
|
// Rule describes an HTTP redirect rule.
|
|
type Rule struct {
|
|
FromScheme func() string
|
|
FromPath, To string
|
|
Code int
|
|
Meta bool
|
|
httpserver.RequestMatcher
|
|
}
|
|
|
|
// Script tag comes first since that will better imitate a redirect in the browser's
|
|
// history, but the meta tag is a fallback for most non-JS clients.
|
|
const metaRedir = `<!DOCTYPE html>
|
|
<html>
|
|
<head>
|
|
<script>window.location.replace("%s");</script>
|
|
<meta http-equiv="refresh" content="0; URL='%s'">
|
|
</head>
|
|
<body>Redirecting...</body>
|
|
</html>
|
|
`
|