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// SPDX-FileCopyrightText: © 2019 Grégoire Duchêne <gduchene@awhk.org>
// SPDX-License-Identifier: ISC
package main
import (
"log"
"net/http"
"path"
"strings"
"text/template"
)
var body = template.Must(template.New("").Parse(`<!doctype html>
<meta name="go-import" content="{{.Package}} {{.VCS}} {{.Repository}}">
<title>go-import-redirect</title>
`))
type bodyData struct{ Package, Repository, VCS string }
type redirector struct{ from, to, vcs string }
var _ http.Handler = &redirector{}
func (h *redirector) ServeHTTP(w http.ResponseWriter, req *http.Request) {
if req.Method != http.MethodGet {
w.Header().Set("Allow", http.MethodGet)
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
pkg := path.Join(req.Host, req.URL.Path)
if req.URL.Query().Get("go-get") != "1" {
w.Header().Set("Location", "https://pkg.go.dev/"+pkg)
w.WriteHeader(http.StatusFound)
return
}
dest := h.getRepo(pkg)
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.WriteHeader(http.StatusOK)
if err := body.Execute(w, bodyData{pkg, dest, h.vcs}); err != nil {
log.Println(err)
}
}
func (h *redirector) getRepo(pkg string) string {
from := strings.TrimRight(h.from, "/")
to := strings.TrimRight(h.to, "/")
path := strings.TrimLeft(strings.TrimPrefix(pkg, from), "/")
return to + "/" + strings.Split(path, "/")[0]
}
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