mirror of https://github.com/gorilla/websocket.git
69 lines
2.5 KiB
Go
69 lines
2.5 KiB
Go
// Copyright 2013 Gary Burd. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package websocket
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import (
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"net/http"
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"strings"
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)
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// HandshakeError describes an error with the handshake from the peer.
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type HandshakeError struct {
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message string
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}
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func (e HandshakeError) Error() string { return e.message }
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// This method is deprecated, use websocket.Upgrader instead.
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//
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// Upgrade upgrades the HTTP server connection to the WebSocket protocol.
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//
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// The application is responsible for checking the request origin before
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// calling Upgrade. An example implementation of the same origin policy is:
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//
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// if req.Header.Get("Origin") != "http://"+req.Host {
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// http.Error(w, "Origin not allowed", 403)
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// return
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// }
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//
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// If the endpoint supports subprotocols, then the application is responsible
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// for negotiating the protocol used on the connection. Use the Subprotocols()
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// function to get the subprotocols requested by the client. Use the
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// Sec-Websocket-Protocol response header to specify the subprotocol selected
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// by the application.
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//
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// The responseHeader is included in the response to the client's upgrade
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// request. Use the responseHeader to specify cookies (Set-Cookie) and the
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// negotiated subprotocol (Sec-Websocket-Protocol).
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//
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// The connection buffers IO to the underlying network connection. The
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// readBufSize and writeBufSize parameters specify the size of the buffers to
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// use. Messages can be larger than the buffers.
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//
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// If the request is not a valid WebSocket handshake, then Upgrade returns an
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// error of type HandshakeError. Applications should handle this error by
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// replying to the client with an HTTP error response.
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func Upgrade(w http.ResponseWriter, r *http.Request, responseHeader http.Header, readBufSize, writeBufSize int) (*Conn, error) {
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u := Upgrader{ReadBufferSize: readBufSize, WriteBufferSize: writeBufSize}
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u.Error = func(w http.ResponseWriter, r *http.Request, status int, reason error) {
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// don't return errors to maintain backwards compatibility
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}
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return u.Upgrade(w, r, responseHeader)
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}
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// Subprotocols returns the subprotocols requested by the client in the
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// Sec-Websocket-Protocol header.
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func Subprotocols(r *http.Request) []string {
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h := strings.TrimSpace(r.Header.Get("Sec-Websocket-Protocol"))
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if h == "" {
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return nil
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}
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protocols := strings.Split(h, ",")
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for i := range protocols {
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protocols[i] = strings.TrimSpace(protocols[i])
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}
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return protocols
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}
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