diff options
Diffstat (limited to 'vendor/github.com/gorilla/websocket/server.go')
| -rw-r--r-- | vendor/github.com/gorilla/websocket/server.go | 61 |
1 files changed, 46 insertions, 15 deletions
diff --git a/vendor/github.com/gorilla/websocket/server.go b/vendor/github.com/gorilla/websocket/server.go index 8d7137de..3495e0f1 100644 --- a/vendor/github.com/gorilla/websocket/server.go +++ b/vendor/github.com/gorilla/websocket/server.go @@ -28,8 +28,9 @@ type Upgrader struct { HandshakeTimeout time.Duration // ReadBufferSize and WriteBufferSize specify I/O buffer sizes. If a buffer - // size is zero, then a default value of 4096 is used. The I/O buffer sizes - // do not limit the size of the messages that can be sent or received. + // size is zero, then buffers allocated by the HTTP server are 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 server's supported protocols in order of @@ -46,6 +47,12 @@ type Upgrader struct { // CheckOrigin is nil, the host in the Origin header must not be set or // must match the host of the request. CheckOrigin func(r *http.Request) bool + + // EnableCompression specify if the server 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 } func (u *Upgrader) returnError(w http.ResponseWriter, r *http.Request, status int, reason string) (*Conn, error) { @@ -53,6 +60,7 @@ func (u *Upgrader) returnError(w http.ResponseWriter, r *http.Request, status in if u.Error != nil { u.Error(w, r, status, err) } else { + w.Header().Set("Sec-Websocket-Version", "13") http.Error(w, http.StatusText(status), status) } return nil, err @@ -97,18 +105,23 @@ func (u *Upgrader) selectSubprotocol(r *http.Request, responseHeader http.Header // response. func (u *Upgrader) Upgrade(w http.ResponseWriter, r *http.Request, responseHeader http.Header) (*Conn, error) { if r.Method != "GET" { - return u.returnError(w, r, http.StatusMethodNotAllowed, "websocket: method not GET") + return u.returnError(w, r, http.StatusMethodNotAllowed, "websocket: not a websocket handshake: request method is not GET") } - if values := r.Header["Sec-Websocket-Version"]; len(values) == 0 || values[0] != "13" { - return u.returnError(w, r, http.StatusBadRequest, "websocket: version != 13") + + if _, ok := responseHeader["Sec-Websocket-Extensions"]; ok { + return u.returnError(w, r, http.StatusInternalServerError, "websocket: application specific 'Sec-Websocket-Extensions' headers are unsupported") } if !tokenListContainsValue(r.Header, "Connection", "upgrade") { - return u.returnError(w, r, http.StatusBadRequest, "websocket: could not find connection header with token 'upgrade'") + return u.returnError(w, r, http.StatusBadRequest, "websocket: not a websocket handshake: 'upgrade' token not found in 'Connection' header") } if !tokenListContainsValue(r.Header, "Upgrade", "websocket") { - return u.returnError(w, r, http.StatusBadRequest, "websocket: could not find upgrade header with token 'websocket'") + return u.returnError(w, r, http.StatusBadRequest, "websocket: not a websocket handshake: 'websocket' token not found in 'Upgrade' header") + } + + if !tokenListContainsValue(r.Header, "Sec-Websocket-Version", "13") { + return u.returnError(w, r, http.StatusBadRequest, "websocket: unsupported version: 13 not found in 'Sec-Websocket-Version' header") } checkOrigin := u.CheckOrigin @@ -116,19 +129,30 @@ func (u *Upgrader) Upgrade(w http.ResponseWriter, r *http.Request, responseHeade checkOrigin = checkSameOrigin } if !checkOrigin(r) { - return u.returnError(w, r, http.StatusForbidden, "websocket: origin not allowed") + return u.returnError(w, r, http.StatusForbidden, "websocket: 'Origin' header value not allowed") } challengeKey := r.Header.Get("Sec-Websocket-Key") if challengeKey == "" { - return u.returnError(w, r, http.StatusBadRequest, "websocket: key missing or blank") + return u.returnError(w, r, http.StatusBadRequest, "websocket: not a websocket handshake: `Sec-Websocket-Key' header is missing or blank") } subprotocol := u.selectSubprotocol(r, responseHeader) + // Negotiate PMCE + var compress bool + if u.EnableCompression { + for _, ext := range parseExtensions(r.Header) { + if ext[""] != "permessage-deflate" { + continue + } + compress = true + break + } + } + var ( netConn net.Conn - br *bufio.Reader err error ) @@ -136,21 +160,25 @@ func (u *Upgrader) Upgrade(w http.ResponseWriter, r *http.Request, responseHeade if !ok { return u.returnError(w, r, http.StatusInternalServerError, "websocket: response does not implement http.Hijacker") } - var rw *bufio.ReadWriter - netConn, rw, err = h.Hijack() + var brw *bufio.ReadWriter + netConn, brw, err = h.Hijack() if err != nil { return u.returnError(w, r, http.StatusInternalServerError, err.Error()) } - br = rw.Reader - if br.Buffered() > 0 { + if brw.Reader.Buffered() > 0 { netConn.Close() return nil, errors.New("websocket: client sent data before handshake is complete") } - c := newConn(netConn, true, u.ReadBufferSize, u.WriteBufferSize) + c := newConnBRW(netConn, true, u.ReadBufferSize, u.WriteBufferSize, brw) c.subprotocol = subprotocol + if compress { + c.newCompressionWriter = compressNoContextTakeover + c.newDecompressionReader = decompressNoContextTakeover + } + p := c.writeBuf[:0] p = append(p, "HTTP/1.1 101 Switching Protocols\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nSec-WebSocket-Accept: "...) p = append(p, computeAcceptKey(challengeKey)...) @@ -160,6 +188,9 @@ func (u *Upgrader) Upgrade(w http.ResponseWriter, r *http.Request, responseHeade p = append(p, c.subprotocol...) p = append(p, "\r\n"...) } + if compress { + p = append(p, "Sec-Websocket-Extensions: permessage-deflate; server_no_context_takeover; client_no_context_takeover\r\n"...) + } for k, vs := range responseHeader { if k == "Sec-Websocket-Protocol" { continue |