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package main
import (
"context"
"errors"
"fmt"
"log"
"net"
"net/http"
"os"
"path/filepath"
"strconv"
)
func sendThatFile(basepath string) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
filename := filepath.Join(basepath, filepath.Clean(string([]rune{filepath.Separator})+r.URL.Path))
f, err := os.Open(filename)
if err != nil {
if errors.Is(err, os.ErrNotExist) {
http.NotFound(w, r)
return
}
http.Error(w, "whoops", http.StatusInternalServerError)
return
}
finfo, err := f.Stat()
if err != nil {
http.Error(w, "whoops", http.StatusInternalServerError)
return
}
http.ServeContent(w, r, filename, finfo.ModTime(), f)
}
}
func main() {
args := os.Args
if len(args) < 2 {
log.Fatal("requires subdirectory path [and optional port [and optional port file name [and optional TLS cert and key file names [and optional pid file name]]]]")
}
basedir := args[1]
port := "0"
if len(args) > 2 {
port = args[2]
}
certs, key := "", ""
if len(args) > 5 && args[4] != "" && args[5] != "" {
certs = args[4]
key = args[5]
}
if len(args) > 6 && args[6] != "" {
f, err := os.Create(args[6])
if err != nil {
log.Fatalf("%v", err)
}
if _, err := f.WriteString(fmt.Sprintf("%d", os.Getpid())); err != nil {
log.Fatalf("%v", err)
}
f.Close()
}
http.HandleFunc("/", sendThatFile(basedir))
server := http.Server{
Addr: ":" + port,
BaseContext: func(l net.Listener) context.Context {
if tcp, ok := l.Addr().(*net.TCPAddr); ok {
if len(args) > 3 {
f, err := os.CreateTemp(filepath.Dir(args[3]), filepath.Base(args[3]))
if err != nil {
log.Fatalf("%v", err)
}
tempName := f.Name()
port := strconv.Itoa(tcp.Port)
if n, err := f.WriteString(port); err != nil || n != len(port) {
if err != nil {
log.Fatalf("%v", err)
}
log.Fatalf("short write: %d != %d", n, len(port))
}
f.Close()
if err := os.Rename(tempName, args[3]); err != nil {
log.Fatalf("rename: %v", err)
}
}
}
return context.Background()
},
}
if certs != "" && key != "" {
log.Fatal(server.ListenAndServeTLS(certs, key))
}
log.Fatal(server.ListenAndServe())
}
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