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57 lines
1.5 KiB
Go
57 lines
1.5 KiB
Go
// 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/middleware"
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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 middleware.Handler
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Rules []Rule
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}
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// ServeHTTP implements the middleware.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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if (rule.FromPath == "/" || r.URL.Path == rule.FromPath) && schemeMatches(rule, r) {
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to := middleware.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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return (rule.FromScheme == "https" && req.TLS != nil) ||
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(rule.FromScheme != "https" && req.TLS == nil)
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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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FromScheme, FromPath, To string
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Code int
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Meta bool
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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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