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