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Proper Location redirects are disadvantageous in some situations. For example, you may want a developer to know that a resource is available via https, but you don't want an insecure call to the API to succeed.
58 lines
1.3 KiB
Go
58 lines
1.3 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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"strings"
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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.From == "/" {
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// Catchall redirect preserves path (TODO: Standardize/formalize this behavior)
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newPath := strings.TrimSuffix(rule.To, "/") + r.URL.Path
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if rule.Meta {
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fmt.Fprintf(w, metaRedir, html.EscapeString(newPath))
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} else {
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http.Redirect(w, r, newPath, rule.Code)
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}
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return 0, nil
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}
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if r.URL.Path == rule.From {
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if rule.Meta {
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fmt.Fprintf(w, metaRedir, html.EscapeString(rule.To))
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} else {
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http.Redirect(w, r, rule.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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// Rule describes an HTTP redirect rule.
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type Rule struct {
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From, To string
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Code int
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Meta bool
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}
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var metaRedir = `<html>
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<head>
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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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