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package main
import (
"crypto/rand"
"embed"
"encoding/binary"
"flag"
"fmt"
"html/template"
"io"
"log"
"net/http"
"strings"
"sync"
"time"
)
var (
port = flag.Int("port", 42069, "port to listen on")
selfURL = flag.String("self-url", "http://localhost:42069", "base URL of the server")
serverStartTime = time.Now()
)
var (
//go:embed templates/404.html.template
notFoundString string
notFoundTemplate = template.Must(template.New("notFound").Parse(notFoundString))
)
func notFound(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusNotFound)
type args struct {
Path string
}
if err := notFoundTemplate.Execute(w, args{Path: r.URL.Path}); err != nil {
log.Printf("Warning: notFound: %s", err)
}
}
var (
//go:embed templates/outline.html.template
outlineString string
outlineTemplate = template.Must(template.New("outline").Parse(outlineString))
//go:embed templates/index.html.template
indexString string
indexTemplate = template.Must(template.Must(outlineTemplate.Clone()).New("body").Parse(indexString)).Lookup("outline")
)
func index(w http.ResponseWriter, _ *http.Request) {
if err := indexTemplate.Execute(w, nil); err != nil {
log.Printf("Warning: index: %s", err)
}
}
var (
//go:embed templates/pong.html.template
pongString string
pongTemplate = template.Must(template.New("pong").Parse(pongString))
)
func pong(w http.ResponseWriter, _ *http.Request) {
if err := pongTemplate.Execute(w, nil); err != nil {
log.Printf("Warning: pong: %s", err)
}
}
//go:embed static
var staticFiles embed.FS
func serveStaticFile(w http.ResponseWriter, r *http.Request, path string) {
f, err := staticFiles.Open(path)
if err != nil {
notFound(w, r)
return
}
defer f.Close()
http.ServeContent(w, r, path, serverStartTime, f.(io.ReadSeeker))
}
func static(w http.ResponseWriter, r *http.Request) {
serveStaticFile(w, r, strings.TrimPrefix(r.URL.Path, "/"))
}
func favicon(w http.ResponseWriter, r *http.Request) {
serveStaticFile(w, r, "static/favicon.ico")
}
var (
//go:embed wordlist.txt
wordListString string
wordList = strings.Split(strings.TrimSuffix(wordListString, "\n"), "\n")
//go:embed templates/wormhole.html.template
wormholeTemplateString string
wormholeTemplate = template.Must(template.Must(outlineTemplate.Clone()).New("body").Parse(wormholeTemplateString)).Lookup("outline")
)
type wormholeTemplateArgs struct {
Self string
Hole string
}
func wormhole(w http.ResponseWriter, r *http.Request) {
buf := make([]byte, 20)
rand.Read(buf)
words := make([]string, 10)
for i := range words {
words[i] = wordList[binary.NativeEndian.Uint16(buf[2*i:])&0x1fff]
}
if err := wormholeTemplate.Execute(w, wormholeTemplateArgs{Self: *selfURL, Hole: strings.Join(words, "-")}); err != nil {
log.Printf("Warning: wormhole: %s", err)
}
}
type wormholeConn struct {
done chan struct{}
w http.ResponseWriter
}
var wormholeConnsMu sync.Mutex
var wormholeConns = make(map[string]*wormholeConn)
var wormholeNotifyMu sync.Mutex
var wormholeNotify = make(map[string]chan struct{})
func wormholeSend(w http.ResponseWriter, r *http.Request) {
reader, err := r.MultipartReader()
if err != nil {
http.Error(w, "not a multipart/form-data request", http.StatusBadRequest)
return
}
for {
part, err := reader.NextPart()
if err != nil {
break
}
if part.FormName() != "file" {
continue
}
hole := r.PathValue("hole")
wormholeConnsMu.Lock()
conn := wormholeConns[hole]
delete(wormholeConns, hole)
wormholeConnsMu.Unlock()
if conn == nil {
http.Error(w, "no such connection", http.StatusBadRequest)
return
}
defer close(conn.done)
conn.w.Header().Set("Content-Disposition", "attachment; filename*=UTF-8''"+part.FileName())
if _, err := io.Copy(conn.w, part); err != nil {
http.Error(w, fmt.Sprintf("Error during copy: %s", err), http.StatusServiceUnavailable)
return
}
fmt.Fprintf(w, "uploaded!")
return
}
http.Error(w, "file not found", http.StatusBadRequest)
}
func wormholeRecv(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
hole := r.PathValue("hole")
conn := &wormholeConn{
done: make(chan struct{}),
w: w,
}
wormholeConnsMu.Lock()
wormholeConns[hole] = conn
wormholeConnsMu.Unlock()
defer func() {
wormholeConnsMu.Lock()
delete(wormholeConns, hole)
wormholeConnsMu.Unlock()
}()
wormholeNotifyMu.Lock()
notify := wormholeNotify[hole]
wormholeNotifyMu.Unlock()
if notify == nil {
http.Error(w, "no such connection", http.StatusBadRequest)
return
}
select {
case notify <- struct{}{}:
default:
http.Error(w, "connection not ready", http.StatusBadRequest)
return
}
select {
case <-ctx.Done():
case <-conn.done:
}
}
func wormholeReady(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
hole := r.PathValue("hole")
notify := make(chan struct{})
wormholeNotifyMu.Lock()
wormholeNotify[hole] = notify
wormholeNotifyMu.Unlock()
defer func() {
wormholeNotifyMu.Lock()
delete(wormholeNotify, hole)
wormholeNotifyMu.Unlock()
}()
w.Header().Set("Content-Type", "text/event-stream")
select {
case <-ctx.Done():
return
case <-notify:
}
fmt.Fprintf(w, "event: ready\ndata:\n\n")
}
func main() {
flag.Parse()
http.HandleFunc("GET /pong", pong)
http.HandleFunc("GET /wormhole", wormhole)
http.HandleFunc("POST /wormhole/{hole}", wormholeSend)
http.HandleFunc("GET /wormhole/{hole}", wormholeRecv)
http.HandleFunc("GET /wormhole/{hole}/ready", wormholeReady)
http.HandleFunc("GET /static/", static)
http.HandleFunc("GET /favicon.ico", favicon)
http.HandleFunc("GET /{$}", index)
http.HandleFunc("GET /", notFound)
addr := fmt.Sprintf(":%d", *port)
server := &http.Server{
Addr: addr,
ReadTimeout: 10 * time.Minute,
WriteTimeout: time.Minute,
}
log.Printf("Listening on %q", addr)
log.Fatal(server.ListenAndServe())
}
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