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// Copyright (c) 2019, Grégoire Duchêne <gduchene@awhk.org>
//
// Use of this source code is governed by the ISC license that can be
// found in the LICENSE file.
// +build !aws
package main
import (
"context"
"fmt"
"log"
"net"
"net/http"
"os"
"os/signal"
"path"
"time"
"golang.org/x/sys/unix"
"go.awhk.org/gosdd"
)
func redirect(resp http.ResponseWriter, req *http.Request) {
if req.Method != http.MethodGet {
resp.Header().Set("Allow", http.MethodGet)
resp.WriteHeader(http.StatusMethodNotAllowed)
return
}
pkg := path.Join(req.Host, req.URL.Path)
resp.Header().Set("Content-Type", "text/html; charset=utf-8")
if req.URL.Query().Get("go-get") == "1" {
resp.WriteHeader(http.StatusOK)
} else {
resp.Header().Set("Location", "https://pkg.go.dev/"+pkg)
resp.WriteHeader(http.StatusFound)
}
if _, err := fmt.Fprint(resp, GetBody(pkg)); err != nil {
log.Println("fmt.Fprint:", err)
}
}
func main() {
mux := http.NewServeMux()
mux.HandleFunc("/", redirect)
srv := http.Server{Handler: mux}
done := make(chan os.Signal, 1)
signal.Notify(done, os.Interrupt, unix.SIGTERM)
go func() {
ln, err := listenSD()
if err != nil {
log.Fatalln("listenSD:", err)
}
if ln == nil {
ln = listenEnv()
}
if err := srv.Serve(ln); err != nil && err != http.ErrServerClosed {
log.Fatalln("server.ListenAndServe:", err)
}
}()
<-done
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
if err := srv.Shutdown(ctx); err != nil && err != http.ErrServerClosed {
log.Fatalln("server.Shutdown:", err)
}
}
func listenEnv() net.Listener {
addr := os.Getenv("ADDR")
if addr == "" || addr[0] != '/' {
if addr == "" {
addr = ":8080"
}
ln, err := net.Listen("tcp", ":8080")
if err != nil {
log.Fatalln("net.Listen:", err)
}
return ln
}
ln, err := net.Listen("unix", addr)
if err != nil {
log.Fatalln("net.Listen:", err)
}
// We do not do any authorization anyway, so 0666 makes sense here.
if err = os.Chmod(addr, 0666); err != nil {
log.Fatalln("os.Chmod:", err)
}
return ln
}
func listenSD() (net.Listener, error) {
fds, err := gosdd.SDListenFDs(true)
if err != nil {
if err == gosdd.ErrNoSDSupport {
return nil, nil
}
return nil, err
}
if len(fds) == 0 {
return nil, nil
}
return net.FileListener(fds[0])
}
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