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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.
package main
import (
"context"
"log"
"net"
"net/http"
"os"
"os/signal"
"path"
"syscall"
"time"
"go.awhk.org/go-import-redirect/internal"
)
func redirect(resp http.ResponseWriter, req *http.Request) {
if req.Method != "GET" {
resp.Header()["Allow"] = []string{"GET"}
resp.WriteHeader(http.StatusMethodNotAllowed)
return
}
pkg := path.Join(req.Host, req.URL.Path)
resp.Header()["Content-Type"] = []string{"text/html; charset=utf-8"}
if v, ok := req.URL.Query()["go-get"]; ok && len(v) > 0 && v[0] == "1" {
resp.WriteHeader(http.StatusOK)
} else {
resp.Header()["Location"] = []string{"https://godoc.org/" + pkg}
resp.WriteHeader(http.StatusFound)
}
resp.Write([]byte(internal.GetBody(pkg)))
}
func main() {
mux := http.NewServeMux()
mux.HandleFunc("/", redirect)
srv := http.Server{Handler: mux}
done := make(chan os.Signal, 1)
signal.Notify(done, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
go func() {
var (
addr = os.Getenv("ADDR")
l net.Listener
err error
)
if addr != "" && addr[0] == '/' {
if l, err = net.Listen("unix", addr); 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)
}
} else {
port := os.Getenv("PORT")
if port == "" {
port = "8080"
}
if l, err = net.Listen("tcp", os.Getenv("ADDR")+":"+port); err != nil {
log.Fatalln("net.Listen:", err)
}
}
if err = srv.Serve(l); 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)
}
}
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