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