mirror of https://github.com/gorilla/websocket.git
251 lines
7.4 KiB
Go
251 lines
7.4 KiB
Go
|
// Copyright 2012 Gary Burd
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 (the "License"): you may
|
||
|
|
// not use this file except in compliance with the License. You may obtain
|
||
|
|
// a copy of the License at
|
||
|
|
//
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
//
|
||
|
|
// Unless required by applicable law or agreed to in writing, software
|
||
|
|
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
||
|
|
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
||
|
|
// License for the specific language governing permissions and limitations
|
||
|
|
// under the License.
|
||
|
|
|
||
|
|
// Command server is a test server for the Autobahn WebSockets Test Suite.
|
||
|
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"errors"
|
||
|
|
"flag"
|
||
|
|
"github.com/gorilla/websocket"
|
||
|
|
"io"
|
||
|
|
"log"
|
||
|
|
"net/http"
|
||
|
|
"time"
|
||
|
|
"unicode/utf8"
|
||
|
|
)
|
||
|
|
|
||
|
|
// echoCopy echoes messages from the client using io.Copy.
|
||
|
|
func echoCopy(w http.ResponseWriter, r *http.Request, writerOnly bool) {
|
||
|
|
conn, err := websocket.Upgrade(w, r, nil, 4096, 4096)
|
||
|
|
if err != nil {
|
||
|
|
log.Println("Upgrade:", err)
|
||
|
|
http.Error(w, "Bad request", 400)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
defer conn.Close()
|
||
|
|
for {
|
||
|
|
mt, r, err := conn.NextReader()
|
||
|
|
if err != nil {
|
||
|
|
if err != io.EOF {
|
||
|
|
log.Println("NextReader:", err)
|
||
|
|
}
|
||
|
|
return
|
||
|
|
}
|
||
|
|
if mt == websocket.TextMessage {
|
||
|
|
r = &validator{r: r}
|
||
|
|
}
|
||
|
|
w, err := conn.NextWriter(mt)
|
||
|
|
if err != nil {
|
||
|
|
log.Println("NextWriter:", err)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
if mt == websocket.TextMessage {
|
||
|
|
r = &validator{r: r}
|
||
|
|
}
|
||
|
|
if writerOnly {
|
||
|
|
_, err = io.Copy(struct{ io.Writer }{w}, r)
|
||
|
|
} else {
|
||
|
|
_, err = io.Copy(w, r)
|
||
|
|
}
|
||
|
|
if err != nil {
|
||
|
|
if err == errInvalidUTF8 {
|
||
|
|
conn.WriteControl(websocket.CloseMessage,
|
||
|
|
websocket.FormatCloseMessage(websocket.CloseInvalidFramePayloadData, ""),
|
||
|
|
time.Time{})
|
||
|
|
}
|
||
|
|
log.Println("Copy:", err)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
err = w.Close()
|
||
|
|
if err != nil {
|
||
|
|
log.Println("Close:", err)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func echoCopyWriterOnly(w http.ResponseWriter, r *http.Request) {
|
||
|
|
echoCopy(w, r, true)
|
||
|
|
}
|
||
|
|
|
||
|
|
func echoCopyFull(w http.ResponseWriter, r *http.Request) {
|
||
|
|
echoCopy(w, r, false)
|
||
|
|
}
|
||
|
|
|
||
|
|
// echoReadAll echoes messages from the client by reading the entire message
|
||
|
|
// with ioutil.ReadAll.
|
||
|
|
func echoReadAll(w http.ResponseWriter, r *http.Request, writeMessage bool) {
|
||
|
|
conn, err := websocket.Upgrade(w, r, nil, 4096, 4096)
|
||
|
|
if err != nil {
|
||
|
|
log.Println("Upgrade:", err)
|
||
|
|
http.Error(w, "Bad request", 400)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
defer conn.Close()
|
||
|
|
for {
|
||
|
|
mt, b, err := conn.ReadMessage()
|
||
|
|
if err != nil {
|
||
|
|
if err != io.EOF {
|
||
|
|
log.Println("NextReader:", err)
|
||
|
|
}
|
||
|
|
return
|
||
|
|
}
|
||
|
|
if mt == websocket.TextMessage {
|
||
|
|
if !utf8.Valid(b) {
|
||
|
|
conn.WriteControl(websocket.CloseMessage,
|
||
|
|
websocket.FormatCloseMessage(websocket.CloseInvalidFramePayloadData, ""),
|
||
|
|
time.Time{})
|
||
|
|
log.Println("ReadAll: invalid utf8")
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if writeMessage {
|
||
|
|
err = conn.WriteMessage(mt, b)
|
||
|
|
if err != nil {
|
||
|
|
log.Println("WriteMessage:", err)
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
w, err := conn.NextWriter(mt)
|
||
|
|
if err != nil {
|
||
|
|
log.Println("NextWriter:", err)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
if _, err := w.Write(b); err != nil {
|
||
|
|
log.Println("Writer:", err)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
if err := w.Close(); err != nil {
|
||
|
|
log.Println("Close:", err)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func echoReadAllWriter(w http.ResponseWriter, r *http.Request) {
|
||
|
|
echoReadAll(w, r, false)
|
||
|
|
}
|
||
|
|
|
||
|
|
func echoReadAllWriteMessage(w http.ResponseWriter, r *http.Request) {
|
||
|
|
echoReadAll(w, r, true)
|
||
|
|
}
|
||
|
|
|
||
|
|
func serveHome(w http.ResponseWriter, r *http.Request) {
|
||
|
|
if r.URL.Path != "/" {
|
||
|
|
http.Error(w, "Not found.", 404)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
if r.Method != "GET" {
|
||
|
|
http.Error(w, "Method not allowed", 405)
|
||
|
|
return
|
||
|
|
}
|
||
|
|
w.Header().Set("Content-Type", "text/html; charset=utf-8")
|
||
|
|
io.WriteString(w, "<html><body>Echo Server</body></html")
|
||
|
|
}
|
||
|
|
|
||
|
|
var addr = flag.String("addr", ":9000", "http service address")
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
flag.Parse()
|
||
|
|
http.HandleFunc("/", serveHome)
|
||
|
|
http.HandleFunc("/c", echoCopyWriterOnly)
|
||
|
|
http.HandleFunc("/f", echoCopyFull)
|
||
|
|
http.HandleFunc("/r", echoReadAllWriter)
|
||
|
|
http.HandleFunc("/m", echoReadAllWriteMessage)
|
||
|
|
err := http.ListenAndServe(*addr, nil)
|
||
|
|
if err != nil {
|
||
|
|
log.Fatal("ListenAndServe: ", err)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
type validator struct {
|
||
|
|
state int
|
||
|
|
x rune
|
||
|
|
r io.Reader
|
||
|
|
}
|
||
|
|
|
||
|
|
var errInvalidUTF8 = errors.New("invalid utf8")
|
||
|
|
|
||
|
|
func (r *validator) Read(p []byte) (int, error) {
|
||
|
|
n, err := r.r.Read(p)
|
||
|
|
state := r.state
|
||
|
|
x := r.x
|
||
|
|
for _, b := range p[:n] {
|
||
|
|
state, x = decode(state, x, b)
|
||
|
|
if state == utf8Reject {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
r.state = state
|
||
|
|
r.x = x
|
||
|
|
if state == utf8Reject || (err == io.EOF && state != utf8Accept) {
|
||
|
|
return n, errInvalidUTF8
|
||
|
|
}
|
||
|
|
return n, err
|
||
|
|
}
|
||
|
|
|
||
|
|
// UTF-8 decoder from http://bjoern.hoehrmann.de/utf-8/decoder/dfa/
|
||
|
|
//
|
||
|
|
// Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de>
|
||
|
|
//
|
||
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
||
|
|
// of this software and associated documentation files (the "Software"), to
|
||
|
|
// deal in the Software without restriction, including without limitation the
|
||
|
|
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
|
||
|
|
// sell copies of the Software, and to permit persons to whom the Software is
|
||
|
|
// furnished to do so, subject to the following conditions:
|
||
|
|
//
|
||
|
|
// The above copyright notice and this permission notice shall be included in
|
||
|
|
// all copies or substantial portions of the Software.
|
||
|
|
//
|
||
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
||
|
|
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
||
|
|
// IN THE SOFTWARE.
|
||
|
|
var utf8d = [...]byte{
|
||
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 00..1f
|
||
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 20..3f
|
||
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 40..5f
|
||
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 60..7f
|
||
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, // 80..9f
|
||
|
|
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, // a0..bf
|
||
|
|
8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // c0..df
|
||
|
|
0xa, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x4, 0x3, 0x3, // e0..ef
|
||
|
|
0xb, 0x6, 0x6, 0x6, 0x5, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, // f0..ff
|
||
|
|
0x0, 0x1, 0x2, 0x3, 0x5, 0x8, 0x7, 0x1, 0x1, 0x1, 0x4, 0x6, 0x1, 0x1, 0x1, 0x1, // s0..s0
|
||
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, // s1..s2
|
||
|
|
1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, // s3..s4
|
||
|
|
1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, 1, // s5..s6
|
||
|
|
1, 3, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // s7..s8
|
||
|
|
}
|
||
|
|
|
||
|
|
const (
|
||
|
|
utf8Accept = 0
|
||
|
|
utf8Reject = 1
|
||
|
|
)
|
||
|
|
|
||
|
|
func decode(state int, x rune, b byte) (int, rune) {
|
||
|
|
t := utf8d[b]
|
||
|
|
if state != utf8Accept {
|
||
|
|
x = rune(b&0x3f) | (x << 6)
|
||
|
|
} else {
|
||
|
|
x = rune((0xff >> t) & b)
|
||
|
|
}
|
||
|
|
state = int(utf8d[256+state*16+int(t)])
|
||
|
|
return state, x
|
||
|
|
}
|