// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // 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" ) var upgrader = websocket.Upgrader{ ReadBufferSize: 4096, WriteBufferSize: 4096, CheckOrigin: func(r *http.Request) bool { return true }, } // echoCopy echoes messages from the client using io.Copy. func echoCopy(w http.ResponseWriter, r *http.Request, writerOnly bool) { conn, err := upgrader.Upgrade(w, r, nil) if err != nil { log.Println("Upgrade:", err) 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 := upgrader.Upgrade(w, r, nil) if err != nil { log.Println("Upgrade:", err) 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, "Echo Server") } 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 // // 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 }