From 56e74239d6b34df8f30ef046f0b0ff4ff0866a71 Mon Sep 17 00:00:00 2001 From: =Corey Hulen Date: Sun, 14 Jun 2015 23:53:32 -0800 Subject: first commit --- .../src/github.com/gorilla/websocket/client.go | 264 +++++++++++++++++++++ 1 file changed, 264 insertions(+) create mode 100644 Godeps/_workspace/src/github.com/gorilla/websocket/client.go (limited to 'Godeps/_workspace/src/github.com/gorilla/websocket/client.go') diff --git a/Godeps/_workspace/src/github.com/gorilla/websocket/client.go b/Godeps/_workspace/src/github.com/gorilla/websocket/client.go new file mode 100644 index 000000000..5bc27e193 --- /dev/null +++ b/Godeps/_workspace/src/github.com/gorilla/websocket/client.go @@ -0,0 +1,264 @@ +// 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. + +package websocket + +import ( + "bytes" + "crypto/tls" + "errors" + "io" + "io/ioutil" + "net" + "net/http" + "net/url" + "strings" + "time" +) + +// ErrBadHandshake is returned when the server response to opening handshake is +// invalid. +var ErrBadHandshake = errors.New("websocket: bad handshake") + +// NewClient creates a new client connection using the given net connection. +// The URL u specifies the host and request URI. Use requestHeader to specify +// the origin (Origin), subprotocols (Sec-WebSocket-Protocol) and cookies +// (Cookie). Use the response.Header to get the selected subprotocol +// (Sec-WebSocket-Protocol) and cookies (Set-Cookie). +// +// If the WebSocket handshake fails, ErrBadHandshake is returned along with a +// non-nil *http.Response so that callers can handle redirects, authentication, +// etc. +func NewClient(netConn net.Conn, u *url.URL, requestHeader http.Header, readBufSize, writeBufSize int) (c *Conn, response *http.Response, err error) { + challengeKey, err := generateChallengeKey() + if err != nil { + return nil, nil, err + } + acceptKey := computeAcceptKey(challengeKey) + + c = newConn(netConn, false, readBufSize, writeBufSize) + p := c.writeBuf[:0] + p = append(p, "GET "...) + p = append(p, u.RequestURI()...) + p = append(p, " HTTP/1.1\r\nHost: "...) + p = append(p, u.Host...) + // "Upgrade" is capitalized for servers that do not use case insensitive + // comparisons on header tokens. + p = append(p, "\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nSec-WebSocket-Version: 13\r\nSec-WebSocket-Key: "...) + p = append(p, challengeKey...) + p = append(p, "\r\n"...) + for k, vs := range requestHeader { + for _, v := range vs { + p = append(p, k...) + p = append(p, ": "...) + p = append(p, v...) + p = append(p, "\r\n"...) + } + } + p = append(p, "\r\n"...) + + if _, err := netConn.Write(p); err != nil { + return nil, nil, err + } + + resp, err := http.ReadResponse(c.br, &http.Request{Method: "GET", URL: u}) + if err != nil { + return nil, nil, err + } + if resp.StatusCode != 101 || + !strings.EqualFold(resp.Header.Get("Upgrade"), "websocket") || + !strings.EqualFold(resp.Header.Get("Connection"), "upgrade") || + resp.Header.Get("Sec-Websocket-Accept") != acceptKey { + return nil, resp, ErrBadHandshake + } + c.subprotocol = resp.Header.Get("Sec-Websocket-Protocol") + return c, resp, nil +} + +// A Dialer contains options for connecting to WebSocket server. +type Dialer struct { + // NetDial specifies the dial function for creating TCP connections. If + // NetDial is nil, net.Dial is used. + NetDial func(network, addr string) (net.Conn, error) + + // TLSClientConfig specifies the TLS configuration to use with tls.Client. + // If nil, the default configuration is used. + TLSClientConfig *tls.Config + + // HandshakeTimeout specifies the duration for the handshake to complete. + HandshakeTimeout time.Duration + + // Input and output buffer sizes. If the buffer size is zero, then a + // default value of 4096 is used. + ReadBufferSize, WriteBufferSize int + + // Subprotocols specifies the client's requested subprotocols. + Subprotocols []string +} + +var errMalformedURL = errors.New("malformed ws or wss URL") + +// parseURL parses the URL. The url.Parse function is not used here because +// url.Parse mangles the path. +func parseURL(s string) (*url.URL, error) { + // From the RFC: + // + // ws-URI = "ws:" "//" host [ ":" port ] path [ "?" query ] + // wss-URI = "wss:" "//" host [ ":" port ] path [ "?" query ] + // + // We don't use the net/url parser here because the dialer interface does + // not provide a way for applications to work around percent deocding in + // the net/url parser. + + var u url.URL + switch { + case strings.HasPrefix(s, "ws://"): + u.Scheme = "ws" + s = s[len("ws://"):] + case strings.HasPrefix(s, "wss://"): + u.Scheme = "wss" + s = s[len("wss://"):] + default: + return nil, errMalformedURL + } + + u.Host = s + u.Opaque = "/" + if i := strings.Index(s, "/"); i >= 0 { + u.Host = s[:i] + u.Opaque = s[i:] + } + + return &u, nil +} + +func hostPortNoPort(u *url.URL) (hostPort, hostNoPort string) { + hostPort = u.Host + hostNoPort = u.Host + if i := strings.LastIndex(u.Host, ":"); i > strings.LastIndex(u.Host, "]") { + hostNoPort = hostNoPort[:i] + } else { + if u.Scheme == "wss" { + hostPort += ":443" + } else { + hostPort += ":80" + } + } + return hostPort, hostNoPort +} + +// DefaultDialer is a dialer with all fields set to the default zero values. +var DefaultDialer *Dialer + +// Dial creates a new client connection. Use requestHeader to specify the +// origin (Origin), subprotocols (Sec-WebSocket-Protocol) and cookies (Cookie). +// Use the response.Header to get the selected subprotocol +// (Sec-WebSocket-Protocol) and cookies (Set-Cookie). +// +// If the WebSocket handshake fails, ErrBadHandshake is returned along with a +// non-nil *http.Response so that callers can handle redirects, authentication, +// etcetera. The response body may not contain the entire response and does not +// need to be closed by the application. +func (d *Dialer) Dial(urlStr string, requestHeader http.Header) (*Conn, *http.Response, error) { + u, err := parseURL(urlStr) + if err != nil { + return nil, nil, err + } + + hostPort, hostNoPort := hostPortNoPort(u) + + if d == nil { + d = &Dialer{} + } + + var deadline time.Time + if d.HandshakeTimeout != 0 { + deadline = time.Now().Add(d.HandshakeTimeout) + } + + netDial := d.NetDial + if netDial == nil { + netDialer := &net.Dialer{Deadline: deadline} + netDial = netDialer.Dial + } + + netConn, err := netDial("tcp", hostPort) + if err != nil { + return nil, nil, err + } + + defer func() { + if netConn != nil { + netConn.Close() + } + }() + + if err := netConn.SetDeadline(deadline); err != nil { + return nil, nil, err + } + + if u.Scheme == "wss" { + cfg := d.TLSClientConfig + if cfg == nil { + cfg = &tls.Config{ServerName: hostNoPort} + } else if cfg.ServerName == "" { + shallowCopy := *cfg + cfg = &shallowCopy + cfg.ServerName = hostNoPort + } + tlsConn := tls.Client(netConn, cfg) + netConn = tlsConn + if err := tlsConn.Handshake(); err != nil { + return nil, nil, err + } + if !cfg.InsecureSkipVerify { + if err := tlsConn.VerifyHostname(cfg.ServerName); err != nil { + return nil, nil, err + } + } + } + + if len(d.Subprotocols) > 0 { + h := http.Header{} + for k, v := range requestHeader { + h[k] = v + } + h.Set("Sec-Websocket-Protocol", strings.Join(d.Subprotocols, ", ")) + requestHeader = h + } + + if len(requestHeader["Host"]) > 0 { + // This can be used to supply a Host: header which is different from + // the dial address. + u.Host = requestHeader.Get("Host") + + // Drop "Host" header + h := http.Header{} + for k, v := range requestHeader { + if k == "Host" { + continue + } + h[k] = v + } + requestHeader = h + } + + conn, resp, err := NewClient(netConn, u, requestHeader, d.ReadBufferSize, d.WriteBufferSize) + + if err != nil { + if err == ErrBadHandshake { + // Before closing the network connection on return from this + // function, slurp up some of the response to aid application + // debugging. + buf := make([]byte, 1024) + n, _ := io.ReadFull(resp.Body, buf) + resp.Body = ioutil.NopCloser(bytes.NewReader(buf[:n])) + } + return nil, resp, err + } + + netConn.SetDeadline(time.Time{}) + netConn = nil // to avoid close in defer. + return conn, resp, nil +} -- cgit v1.2.3-1-g7c22