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| 1 | +/* |
| 2 | +Copyright 2020 The Kubernetes Authors. |
| 3 | +
|
| 4 | +Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | +you may not use this file except in compliance with the License. |
| 6 | +You may obtain a copy of the License at |
| 7 | +
|
| 8 | + http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | +
|
| 10 | +Unless required by applicable law or agreed to in writing, software |
| 11 | +distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | +See the License for the specific language governing permissions and |
| 14 | +limitations under the License. |
| 15 | +*/ |
| 16 | + |
| 17 | +package websocket |
| 18 | + |
| 19 | +import ( |
| 20 | + "fmt" |
| 21 | + "net/http" |
| 22 | + "net/url" |
| 23 | + |
| 24 | + restclient "k8s.io/client-go/rest" |
| 25 | + |
| 26 | + "golang.org/x/net/websocket" |
| 27 | +) |
| 28 | + |
| 29 | +type extractRT struct { |
| 30 | + http.Header |
| 31 | +} |
| 32 | + |
| 33 | +func (rt *extractRT) RoundTrip(req *http.Request) (*http.Response, error) { |
| 34 | + rt.Header = req.Header |
| 35 | + return &http.Response{}, nil |
| 36 | +} |
| 37 | + |
| 38 | +// OpenWebSocketForURL constructs a websocket connection to the provided URL, using the client |
| 39 | +// config, with the specified protocols. |
| 40 | +func OpenWebSocketForURL(url *url.URL, config *restclient.Config, protocols []string) (*websocket.Conn, error) { |
| 41 | + tlsConfig, err := restclient.TLSConfigFor(config) |
| 42 | + if err != nil { |
| 43 | + return nil, fmt.Errorf("Failed to create tls config: %v", err) |
| 44 | + } |
| 45 | + if url.Scheme == "https" { |
| 46 | + url.Scheme = "wss" |
| 47 | + } else { |
| 48 | + url.Scheme = "ws" |
| 49 | + } |
| 50 | + headers, err := headersForConfig(config, url) |
| 51 | + if err != nil { |
| 52 | + return nil, fmt.Errorf("Failed to load http headers: %v", err) |
| 53 | + } |
| 54 | + cfg, err := websocket.NewConfig(url.String(), "http://localhost") |
| 55 | + if err != nil { |
| 56 | + return nil, fmt.Errorf("Failed to create websocket config: %v", err) |
| 57 | + } |
| 58 | + cfg.Header = headers |
| 59 | + cfg.TlsConfig = tlsConfig |
| 60 | + cfg.Protocol = protocols |
| 61 | + return websocket.DialConfig(cfg) |
| 62 | +} |
| 63 | + |
| 64 | +// headersForConfig extracts any http client logic necessary for the provided |
| 65 | +// config. |
| 66 | +func headersForConfig(c *restclient.Config, url *url.URL) (http.Header, error) { |
| 67 | + extract := &extractRT{} |
| 68 | + rt, err := restclient.HTTPWrappersForConfig(c, extract) |
| 69 | + if err != nil { |
| 70 | + return nil, err |
| 71 | + } |
| 72 | + request, err := http.NewRequest("GET", url.String(), nil) |
| 73 | + if err != nil { |
| 74 | + return nil, err |
| 75 | + } |
| 76 | + if _, err := rt.RoundTrip(request); err != nil { |
| 77 | + return nil, err |
| 78 | + } |
| 79 | + return extract.Header, nil |
| 80 | +} |
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