diff options
Diffstat (limited to 'vendor/github.com/gorilla/websocket/client.go')
| -rw-r--r-- | vendor/github.com/gorilla/websocket/client.go | 392 |
1 files changed, 0 insertions, 392 deletions
diff --git a/vendor/github.com/gorilla/websocket/client.go b/vendor/github.com/gorilla/websocket/client.go deleted file mode 100644 index 43a87c75..00000000 --- a/vendor/github.com/gorilla/websocket/client.go +++ /dev/null @@ -1,392 +0,0 @@ -// 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 ( - "bufio" - "bytes" - "crypto/tls" - "encoding/base64" - "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") - -var errInvalidCompression = errors.New("websocket: invalid compression negotiation") - -// 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. -// -// Deprecated: Use Dialer instead. -func NewClient(netConn net.Conn, u *url.URL, requestHeader http.Header, readBufSize, writeBufSize int) (c *Conn, response *http.Response, err error) { - d := Dialer{ - ReadBufferSize: readBufSize, - WriteBufferSize: writeBufSize, - NetDial: func(net, addr string) (net.Conn, error) { - return netConn, nil - }, - } - return d.Dial(u.String(), requestHeader) -} - -// 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) - - // Proxy specifies a function to return a proxy for a given - // Request. If the function returns a non-nil error, the - // request is aborted with the provided error. - // If Proxy is nil or returns a nil *URL, no proxy is used. - Proxy func(*http.Request) (*url.URL, 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 - - // ReadBufferSize and WriteBufferSize specify I/O buffer sizes. If a buffer - // size is zero, then a useful default size is used. The I/O buffer sizes - // do not limit the size of the messages that can be sent or received. - ReadBufferSize, WriteBufferSize int - - // Subprotocols specifies the client's requested subprotocols. - Subprotocols []string - - // EnableCompression specifies if the client should attempt to negotiate - // per message compression (RFC 7692). Setting this value to true does not - // guarantee that compression will be supported. Currently only "no context - // takeover" modes are supported. - EnableCompression bool - - // Jar specifies the cookie jar. - // If Jar is nil, cookies are not sent in requests and ignored - // in responses. - Jar http.CookieJar -} - -var errMalformedURL = errors.New("malformed ws or wss URL") - -// parseURL parses the URL. -// -// This function is a replacement for the standard library url.Parse function. -// In Go 1.4 and earlier, url.Parse loses information from 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 ] - 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 - } - - if i := strings.Index(s, "?"); i >= 0 { - u.RawQuery = s[i+1:] - s = s[:i] - } - - if i := strings.Index(s, "/"); i >= 0 { - u.Opaque = s[i:] - s = s[:i] - } else { - u.Opaque = "/" - } - - u.Host = s - - if strings.Contains(u.Host, "@") { - // Don't bother parsing user information because user information is - // not allowed in websocket URIs. - return nil, errMalformedURL - } - - 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 { - switch u.Scheme { - case "wss": - hostPort += ":443" - case "https": - hostPort += ":443" - default: - hostPort += ":80" - } - } - return hostPort, hostNoPort -} - -// DefaultDialer is a dialer with all fields set to the default zero values. -var DefaultDialer = &Dialer{ - Proxy: http.ProxyFromEnvironment, -} - -// 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) { - - if d == nil { - d = &Dialer{ - Proxy: http.ProxyFromEnvironment, - } - } - - challengeKey, err := generateChallengeKey() - if err != nil { - return nil, nil, err - } - - u, err := parseURL(urlStr) - if err != nil { - return nil, nil, err - } - - switch u.Scheme { - case "ws": - u.Scheme = "http" - case "wss": - u.Scheme = "https" - default: - return nil, nil, errMalformedURL - } - - if u.User != nil { - // User name and password are not allowed in websocket URIs. - return nil, nil, errMalformedURL - } - - req := &http.Request{ - Method: "GET", - URL: u, - Proto: "HTTP/1.1", - ProtoMajor: 1, - ProtoMinor: 1, - Header: make(http.Header), - Host: u.Host, - } - - // Set the cookies present in the cookie jar of the dialer - if d.Jar != nil { - for _, cookie := range d.Jar.Cookies(u) { - req.AddCookie(cookie) - } - } - - // Set the request headers using the capitalization for names and values in - // RFC examples. Although the capitalization shouldn't matter, there are - // servers that depend on it. The Header.Set method is not used because the - // method canonicalizes the header names. - req.Header["Upgrade"] = []string{"websocket"} - req.Header["Connection"] = []string{"Upgrade"} - req.Header["Sec-WebSocket-Key"] = []string{challengeKey} - req.Header["Sec-WebSocket-Version"] = []string{"13"} - if len(d.Subprotocols) > 0 { - req.Header["Sec-WebSocket-Protocol"] = []string{strings.Join(d.Subprotocols, ", ")} - } - for k, vs := range requestHeader { - switch { - case k == "Host": - if len(vs) > 0 { - req.Host = vs[0] - } - case k == "Upgrade" || - k == "Connection" || - k == "Sec-Websocket-Key" || - k == "Sec-Websocket-Version" || - k == "Sec-Websocket-Extensions" || - (k == "Sec-Websocket-Protocol" && len(d.Subprotocols) > 0): - return nil, nil, errors.New("websocket: duplicate header not allowed: " + k) - default: - req.Header[k] = vs - } - } - - if d.EnableCompression { - req.Header.Set("Sec-Websocket-Extensions", "permessage-deflate; server_no_context_takeover; client_no_context_takeover") - } - - hostPort, hostNoPort := hostPortNoPort(u) - - var proxyURL *url.URL - // Check wether the proxy method has been configured - if d.Proxy != nil { - proxyURL, err = d.Proxy(req) - } - if err != nil { - return nil, nil, err - } - - var targetHostPort string - if proxyURL != nil { - targetHostPort, _ = hostPortNoPort(proxyURL) - } else { - targetHostPort = hostPort - } - - 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", targetHostPort) - 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 proxyURL != nil { - connectHeader := make(http.Header) - if user := proxyURL.User; user != nil { - proxyUser := user.Username() - if proxyPassword, passwordSet := user.Password(); passwordSet { - credential := base64.StdEncoding.EncodeToString([]byte(proxyUser + ":" + proxyPassword)) - connectHeader.Set("Proxy-Authorization", "Basic "+credential) - } - } - connectReq := &http.Request{ - Method: "CONNECT", - URL: &url.URL{Opaque: hostPort}, - Host: hostPort, - Header: connectHeader, - } - - connectReq.Write(netConn) - - // Read response. - // Okay to use and discard buffered reader here, because - // TLS server will not speak until spoken to. - br := bufio.NewReader(netConn) - resp, err := http.ReadResponse(br, connectReq) - if err != nil { - return nil, nil, err - } - if resp.StatusCode != 200 { - f := strings.SplitN(resp.Status, " ", 2) - return nil, nil, errors.New(f[1]) - } - } - - if u.Scheme == "https" { - cfg := cloneTLSConfig(d.TLSClientConfig) - if cfg.ServerName == "" { - 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 - } - } - } - - conn := newConn(netConn, false, d.ReadBufferSize, d.WriteBufferSize) - - if err := req.Write(netConn); err != nil { - return nil, nil, err - } - - resp, err := http.ReadResponse(conn.br, req) - if err != nil { - return nil, nil, err - } - - if d.Jar != nil { - if rc := resp.Cookies(); len(rc) > 0 { - d.Jar.SetCookies(u, rc) - } - } - - if resp.StatusCode != 101 || - !strings.EqualFold(resp.Header.Get("Upgrade"), "websocket") || - !strings.EqualFold(resp.Header.Get("Connection"), "upgrade") || - resp.Header.Get("Sec-Websocket-Accept") != computeAcceptKey(challengeKey) { - // 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, ErrBadHandshake - } - - for _, ext := range parseExtensions(resp.Header) { - if ext[""] != "permessage-deflate" { - continue - } - _, snct := ext["server_no_context_takeover"] - _, cnct := ext["client_no_context_takeover"] - if !snct || !cnct { - return nil, resp, errInvalidCompression - } - conn.newCompressionWriter = compressNoContextTakeover - conn.newDecompressionReader = decompressNoContextTakeover - break - } - - resp.Body = ioutil.NopCloser(bytes.NewReader([]byte{})) - conn.subprotocol = resp.Header.Get("Sec-Websocket-Protocol") - - netConn.SetDeadline(time.Time{}) - netConn = nil // to avoid close in defer. - return conn, resp, nil -} |