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server.go
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server.go
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package main
import (
"code.google.com/p/go.net/websocket"
"crypto/hmac"
"crypto/sha1"
"encoding/base64"
"flag"
"fmt"
"net/http"
"path"
"strings"
"sync"
"time"
)
//var port *int = flag.Int("port", 23456, "Port to listen.")
var host *string = flag.String("hostname", "localhost:23456", "Host:Port")
var contentDir *string = flag.String("contentdir", "./html/", "Path to html content dir.")
var cookie_secret *string = flag.String("cookie_secret", "", "Secret used to validate secure cookies.")
/*get_secure_cookie is a port of tornado webs cookie verificaiton algorythem for authenticating client conections.
From tornado:
def decode_signed_value(secret, name, value, max_age_days=31):
if not value:
return None
parts = utf8(value).split(b"|")
if len(parts) != 3:
return None
signature = _create_signature(secret, name, parts[0], parts[1])
if not _time_independent_equals(parts[2], signature):
gen_log.warning("Invalid cookie signature %r", value)
return None
timestamp = int(parts[1])
if timestamp < time.time() - max_age_days * 86400:
gen_log.warning("Expired cookie %r", value)
return None
if timestamp > time.time() + 31 * 86400:
# _cookie_signature does not hash a delimiter between the
# parts of the cookie, so an attacker could transfer trailing
# digits from the payload to the timestamp without altering the
# signature. For backwards compatibility, sanity-check timestamp
# here instead of modifying _cookie_signature.
gen_log.warning("Cookie timestamp in future; possible tampering %r", value)
return None
if parts[1].startswith(b"0"):
gen_log.warning("Tampered cookie %r", value)
return None
try:
return base64.b64decode(parts[0])
except Exception:
return None
def _create_signature(secret, *parts):
hash = hmac.new(utf8(secret), digestmod=hashlib.sha1)
for part in parts:
hash.update(utf8(part))
return utf8(hash.hexdigest())
*/
func get_secure_cookie(ws *websocket.Conn, name string, secret string) string {
cookie, err := ws.Request().Cookie(name)
if err != nil {
return ""
}
value := cookie.String()
if len(value) == 0 {
return ""
}
parts := strings.Split(value, "|")
if len(parts) != 3 {
return ""
}
hash := hmac.New(sha1.New, []byte(secret))
_, _ = hash.Write([]byte(parts[0]))
if !hmac.Equal(hash.Sum([]byte(parts[1])), []byte(parts[2])) {
return ""
}
if cookie.Expires.Before(time.Now().Add(time.Hour * -24 * 31)) {
return ""
}
if cookie.Expires.After(time.Now().Add(time.Hour * 24 * 31)) {
return ""
}
if []byte(parts[1])[0] == byte(0) {
return ""
}
data, err := base64.StdEncoding.DecodeString(parts[0])
if err != nil {
return ""
}
return string(data)
}
//Global registry to keep track of where to send incoming results
var WsRegistry = map[string]chan string{}
var RegistryRWMutex sync.RWMutex
//Handeler for websocket connectionf from client pages.
func SocketStreamer(ws *websocket.Conn) {
//for {
url := *ws.Config().Location
id := path.Base(url.Path)
fmt.Printf("Socket conectiong to %#v\n", url)
if len(*cookie_secret) > 0 {
user := get_secure_cookie(ws, "woami", *cookie_secret)
if len(user) == 0 {
ws.Close()
return
}
}
RestultChan := make(chan string, 0)
RegistryRWMutex.Lock()
WsRegistry[id] = RestultChan
RegistryRWMutex.Unlock()
for {
select {
case msg := <-RestultChan:
err := websocket.Message.Send(ws, msg)
if err != nil {
fmt.Println(err)
break
}
fmt.Printf("send:%#v\n", msg)
case <-time.After(5 * time.Minute):
fmt.Println("timed out streaming to user ", id)
break
}
}
RegistryRWMutex.Lock()
delete(WsRegistry, id)
RegistryRWMutex.Unlock()
ws.Close()
}
//excepts posts from tasks and dispatches them to appropriate Socket Streamer
func ResultHandeler(w http.ResponseWriter, req *http.Request) {
//TODO: check to make sure it is a post with results in it
//and sanatize it so people can't push arbitray stuff to the client
fmt.Println("result request ", req.URL.Path)
id := path.Base(req.URL.Path)
RegistryRWMutex.RLock()
val, ok := WsRegistry[id]
RegistryRWMutex.RUnlock()
if ok {
select {
case val <- req.FormValue("results"):
case <-time.After(5 * time.Second):
fmt.Println("timed out streaming to user ", id)
}
}
}
//main method, parse input, and setup webserver
func main() {
flag.Parse()
fmt.Println("Serving ", *host)
fmt.Printf("Conect websockets to %v/streamer/id and post messages to %v/results/id\n\n", *host, *host)
http.Handle("/streamer/", websocket.Handler(SocketStreamer))
http.HandleFunc("/results/", ResultHandeler)
http.Handle("/html/", http.StripPrefix("/html/", http.FileServer(http.Dir(*contentDir))))
http.Handle("/", http.RedirectHandler("/html/index.html", http.StatusTemporaryRedirect))
//fmt.Printf("http://localhost:%d/\n", *port)
err := http.ListenAndServe(*host, nil)
if err != nil {
panic("ListenAndServe: " + err.Error())
}
}