spongy/spongy.cgi/spongy.cgi.go

170 lines
3.4 KiB
Go

package main
import (
"fmt"
"github.com/go-fsnotify/fsnotify"
"io/ioutil"
"log"
"os"
"bufio"
"strconv"
"strings"
"net/http"
"net/http/cgi"
"time"
"path"
)
type Handler struct {
cgi.Handler
}
var NetworkDir string
func ReadString(fn string) string {
octets, err := ioutil.ReadFile(fn)
if err != nil {
log.Fatal(err)
}
return strings.TrimSpace(string(octets))
}
func tail(w http.ResponseWriter, filename string, pos int64) {
var err error
currentfn := path.Join(NetworkDir, "current")
if filename == "" {
filename, err = os.Readlink(currentfn)
if err != nil {
log.Fatal(err)
}
}
filepath := path.Join(NetworkDir, filename)
f, err := os.Open(filepath)
if err != nil {
log.Fatal(err)
}
defer f.Close()
watcher, err := fsnotify.NewWatcher()
if err != nil {
log.Fatal(err)
}
defer watcher.Close()
watcher.Add(filepath)
for {
printid := false
newpos, err := f.Seek(pos, 0)
if err != nil {
log.Fatal(err)
}
if newpos != pos {
log.Fatal("Lost my position in the log, somehow (log truncated?)")
}
bf := bufio.NewScanner(f)
for bf.Scan() {
t := bf.Text()
pos += int64(len(t)) + 1 // XXX: this breaks if we ever see \r\n
parts := strings.Split(t, " ")
if (len(parts) >= 4) && (parts[2] == "NEXTLOG") {
watcher.Remove(filepath)
filename = parts[3]
filepath = path.Join(NetworkDir, filename)
f.Close()
f, err = os.Open(filepath)
if err != nil {
log.Fatal(err)
}
watcher.Add(filepath)
pos = 0
}
fmt.Fprintf(w, "data: %s\n", t)
printid = true
}
if printid {
_, err = fmt.Fprintf(w, "id: %s/%d\n\n", filename, pos)
}
if err != nil {
break
}
w.(http.Flusher).Flush()
select {
case _ = <-watcher.Events:
// Somethin' happened!
case err := <-watcher.Errors:
log.Fatal(err)
}
}
}
func handleCommand(w http.ResponseWriter, text string, target string) {
fn := path.Join(NetworkDir, fmt.Sprintf("outq/cgi.%d", time.Now().Unix()))
f, err := os.Create(fn)
if err != nil {
fmt.Fprintln(w, "NO: Cannot create outq file")
fmt.Fprintln(w, err)
return
}
defer f.Close()
switch {
case strings.HasPrefix(text, "/quote "):
fmt.Fprintln(f, text[7:])
case strings.HasPrefix(text, "/me "):
fmt.Fprintf(f, "PRIVMSG %s :\001ACTION %s\001\n", target, text[4:])
default:
fmt.Fprintf(f, "PRIVMSG %s :%s\n", target, text)
}
fmt.Fprintln(w, "OK")
}
func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
BaseDir := "networks"
DefaultDir := path.Join(BaseDir, "default")
NetworkDir = path.Join(BaseDir, r.FormValue("network"))
if path.Dir(DefaultDir) != path.Dir(NetworkDir) {
NetworkDir = DefaultDir
}
authtok := ReadString(path.Join(NetworkDir, "authtok"))
if r.FormValue("auth") != authtok {
w.Header().Set("Content-Type", "text/plain")
fmt.Fprintln(w, "NO: Invalid authtok")
return
}
switch r.FormValue("type") {
case "command":
w.Header().Set("Content-Type", "text/plain")
handleCommand(w, r.Form.Get("text"), r.FormValue("target"))
default:
w.Header().Set("Content-Type", "text/event-stream")
parts := strings.Split(os.Getenv("HTTP_LAST_EVENT_ID"), "/")
if len(parts) == 2 {
filename := path.Base(parts[0])
pos, _ := strconv.ParseInt(parts[1], 0, 64)
tail(w, filename, pos)
} else {
tail(w, "", 0)
}
}
}
func main() {
h := Handler{}
if err := cgi.Serve(h); err != nil {
log.Fatal(err)
}
}