test/e2e/framework:move OpenWebSocketForURL to subpackage(new) websocket

test/e2e/framework/websocket/websocket_util.go

@@ -0,0 +1,80 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package websocket
+
+import (
+	"fmt"
+	"net/http"
+	"net/url"
+
+	restclient "k8s.io/client-go/rest"
+
+	"golang.org/x/net/websocket"
+)
+
+type extractRT struct {
+	http.Header
+}
+
+func (rt *extractRT) RoundTrip(req *http.Request) (*http.Response, error) {
+	rt.Header = req.Header
+	return &http.Response{}, nil
+}
+
+// OpenWebSocketForURL constructs a websocket connection to the provided URL, using the client
+// config, with the specified protocols.
+func OpenWebSocketForURL(url *url.URL, config *restclient.Config, protocols []string) (*websocket.Conn, error) {
+	tlsConfig, err := restclient.TLSConfigFor(config)
+	if err != nil {
+		return nil, fmt.Errorf("Failed to create tls config: %v", err)
+	}
+	if url.Scheme == "https" {
+		url.Scheme = "wss"
+	} else {
+		url.Scheme = "ws"
+	}
+	headers, err := headersForConfig(config, url)
+	if err != nil {
+		return nil, fmt.Errorf("Failed to load http headers: %v", err)
+	}
+	cfg, err := websocket.NewConfig(url.String(), "http://localhost")
+	if err != nil {
+		return nil, fmt.Errorf("Failed to create websocket config: %v", err)
+	}
+	cfg.Header = headers
+	cfg.TlsConfig = tlsConfig
+	cfg.Protocol = protocols
+	return websocket.DialConfig(cfg)
+}
+
+// headersForConfig extracts any http client logic necessary for the provided
+// config.
+func headersForConfig(c *restclient.Config, url *url.URL) (http.Header, error) {
+	extract := &extractRT{}
+	rt, err := restclient.HTTPWrappersForConfig(c, extract)
+	if err != nil {
+		return nil, err
+	}
+	request, err := http.NewRequest("GET", url.String(), nil)
+	if err != nil {
+		return nil, err
+	}
+	if _, err := rt.RoundTrip(request); err != nil {
+		return nil, err
+	}
+	return extract.Header, nil
+}