84 lines
1.5 KiB
Go
84 lines
1.5 KiB
Go
package slack
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import (
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"crypto/tls"
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"errors"
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"net"
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"net/http"
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"net/http/httputil"
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"net/url"
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"os"
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"strings"
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"golang.org/x/net/websocket"
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)
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// Taken and reworked from: https://gist.github.com/madmo/8548738
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func websocketHTTPConnect(proxy, urlString string) (net.Conn, error) {
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p, err := net.Dial("tcp", proxy)
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if err != nil {
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return nil, err
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}
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turl, err := url.Parse(urlString)
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if err != nil {
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return nil, err
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}
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req := http.Request{
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Method: "CONNECT",
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URL: &url.URL{},
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Host: turl.Host,
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}
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cc := httputil.NewProxyClientConn(p, nil)
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cc.Do(&req)
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if err != nil && err != httputil.ErrPersistEOF {
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return nil, err
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}
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rwc, _ := cc.Hijack()
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return rwc, nil
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}
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func websocketProxyDial(urlString, origin string) (ws *websocket.Conn, err error) {
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if os.Getenv("HTTP_PROXY") == "" {
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return websocket.Dial(urlString, "", origin)
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}
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purl, err := url.Parse(os.Getenv("HTTP_PROXY"))
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if err != nil {
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return nil, err
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}
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config, err := websocket.NewConfig(urlString, origin)
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if err != nil {
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return nil, err
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}
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client, err := websocketHTTPConnect(purl.Host, urlString)
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if err != nil {
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return nil, err
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}
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switch config.Location.Scheme {
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case "ws":
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case "wss":
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tlsClient := tls.Client(client, &tls.Config{
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ServerName: strings.Split(config.Location.Host, ":")[0],
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})
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err := tlsClient.Handshake()
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if err != nil {
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tlsClient.Close()
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return nil, err
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}
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client = tlsClient
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default:
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return nil, errors.New("invalid websocket schema")
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}
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return websocket.NewClient(config, client)
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}
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