Add support for websocket proxying

handlers/websocket_reverseproxy.go

@@ -0,0 +1,54 @@
+package handlers
+
+import (
+	"crypto/tls"
+	"fmt"
+	"net"
+	"net/http"
+	"strings"
+
+	"github.com/franela/play-with-docker/config"
+	"github.com/gorilla/mux"
+	"github.com/yhat/wsutil"
+)
+
+func NewMultipleHostWebsocketReverseProxy() *wsutil.ReverseProxy {
+	tlsConfig := &tls.Config{
+		InsecureSkipVerify: true,
+	}
+	director := func(req *http.Request) {
+		v := mux.Vars(req)
+		node := v["node"]
+		port := v["port"]
+		hostPort := strings.Split(req.Host, ":")
+
+		// give priority to the URL host port
+		if len(hostPort) > 1 && hostPort[1] != config.PortNumber {
+			port = hostPort[1]
+		} else if port == "" {
+			port = "80"
+		}
+
+		if strings.HasPrefix(node, "ip") {
+			// Node is actually an ip, need to convert underscores by dots.
+			ip := strings.Replace(strings.TrimPrefix(node, "ip"), "_", ".", -1)
+
+			if net.ParseIP(ip) == nil {
+				// Not a valid IP, so treat this is a hostname.
+			} else {
+				node = ip
+			}
+		}
+
+		if port == "443" {
+			// Only proxy http for now
+			req.URL.Scheme = "wss"
+		} else {
+			// Only proxy http for now
+			req.URL.Scheme = "ws"
+		}
+		req.URL.Host = fmt.Sprintf("%s:%s", node, port)
+	}
+
+	return &wsutil.ReverseProxy{Director: director, TLSClientConfig: tlsConfig}
+}