зеркало из https://github.com/golang/pkgsite.git
76 строки
2.2 KiB
Go
76 строки
2.2 KiB
Go
// Copyright 2020 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package middleware
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import (
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"net/http"
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"net/url"
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)
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const (
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betaPkgGoDevRedirectCookie = "betapkggodev-redirect"
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betaPkgGoDevRedirectParam = "betaredirect"
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betaPkgGoDevRedirectOn = "on"
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betaPkgGoDevRedirectOff = "off"
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betaPkgGoDevHost = "beta.pkg.go.dev"
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)
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// BetaPkgGoDevRedirect redirects requests from pkg.go.dev to beta.pkg.go.dev,
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// based on whether a cookie is set for betapkggodev-redirect. The cookie
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// can be turned on/off using a query param.
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func BetaPkgGoDevRedirect() Middleware {
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return func(h http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if userReturningFromBetaPkgGoDev(r) {
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h.ServeHTTP(w, r)
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return
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}
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redirectParam := r.FormValue(betaPkgGoDevRedirectParam)
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if redirectParam == betaPkgGoDevRedirectOn {
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cookie := &http.Cookie{Name: betaPkgGoDevRedirectCookie, Value: redirectParam, Path: "/"}
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http.SetCookie(w, cookie)
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}
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if redirectParam == betaPkgGoDevRedirectOff {
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cookie := &http.Cookie{Name: betaPkgGoDevRedirectCookie, Value: "", MaxAge: -1, Path: "/"}
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http.SetCookie(w, cookie)
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}
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if !shouldRedirectToBetaPkgGoDev(r) {
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h.ServeHTTP(w, r)
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return
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}
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http.Redirect(w, r, betaPkgGoDevURL(r.URL).String(), http.StatusFound)
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})
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}
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}
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func userReturningFromBetaPkgGoDev(req *http.Request) bool {
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return req.FormValue("utm_source") == "backtopkggodev"
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}
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func shouldRedirectToBetaPkgGoDev(req *http.Request) bool {
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redirectParam := req.FormValue(betaPkgGoDevRedirectParam)
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if redirectParam == betaPkgGoDevRedirectOn || redirectParam == betaPkgGoDevRedirectOff {
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return redirectParam == betaPkgGoDevRedirectOn
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}
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cookie, err := req.Cookie(betaPkgGoDevRedirectCookie)
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return (err == nil && cookie.Value == betaPkgGoDevRedirectOn)
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}
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func betaPkgGoDevURL(sourceURL *url.URL) *url.URL {
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values := sourceURL.Query()
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values.Del(betaPkgGoDevRedirectParam)
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values.Set("utm_source", "pkggodev")
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return &url.URL{
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Scheme: "https",
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Host: betaPkgGoDevHost,
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Path: sourceURL.Path,
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RawQuery: values.Encode(),
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}
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}
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