rebase: update k8s.io packages to v0.29.0

Signed-off-by: Niels de Vos <ndevos@ibm.com>

vendor/k8s.io/apimachinery/pkg/util/proxy/dial.go

@@ -0,0 +1,122 @@
+/*
+Copyright 2015 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 proxy
+
+import (
+	"context"
+	"crypto/tls"
+	"fmt"
+	"net"
+	"net/http"
+	"net/url"
+
+	utilnet "k8s.io/apimachinery/pkg/util/net"
+	"k8s.io/apimachinery/third_party/forked/golang/netutil"
+	"k8s.io/klog/v2"
+)
+
+// DialURL will dial the specified URL using the underlying dialer held by the passed
+// RoundTripper. The primary use of this method is to support proxying upgradable connections.
+// For this reason this method will prefer to negotiate http/1.1 if the URL scheme is https.
+// If you wish to ensure ALPN negotiates http2 then set NextProto=[]string{"http2"} in the
+// TLSConfig of the http.Transport
+func DialURL(ctx context.Context, url *url.URL, transport http.RoundTripper) (net.Conn, error) {
+	dialAddr := netutil.CanonicalAddr(url)
+
+	dialer, err := utilnet.DialerFor(transport)
+	if err != nil {
+		klog.V(5).Infof("Unable to unwrap transport %T to get dialer: %v", transport, err)
+	}
+
+	switch url.Scheme {
+	case "http":
+		if dialer != nil {
+			return dialer(ctx, "tcp", dialAddr)
+		}
+		var d net.Dialer
+		return d.DialContext(ctx, "tcp", dialAddr)
+	case "https":
+		// Get the tls config from the transport if we recognize it
+		tlsConfig, err := utilnet.TLSClientConfig(transport)
+		if err != nil {
+			klog.V(5).Infof("Unable to unwrap transport %T to get at TLS config: %v", transport, err)
+		}
+
+		if dialer != nil {
+			// We have a dialer; use it to open the connection, then
+			// create a tls client using the connection.
+			netConn, err := dialer(ctx, "tcp", dialAddr)
+			if err != nil {
+				return nil, err
+			}
+			if tlsConfig == nil {
+				// tls.Client requires non-nil config
+				klog.Warning("using custom dialer with no TLSClientConfig. Defaulting to InsecureSkipVerify")
+				// tls.Handshake() requires ServerName or InsecureSkipVerify
+				tlsConfig = &tls.Config{
+					InsecureSkipVerify: true,
+				}
+			} else if len(tlsConfig.ServerName) == 0 && !tlsConfig.InsecureSkipVerify {
+				// tls.HandshakeContext() requires ServerName or InsecureSkipVerify
+				// infer the ServerName from the hostname we're connecting to.
+				inferredHost := dialAddr
+				if host, _, err := net.SplitHostPort(dialAddr); err == nil {
+					inferredHost = host
+				}
+				// Make a copy to avoid polluting the provided config
+				tlsConfigCopy := tlsConfig.Clone()
+				tlsConfigCopy.ServerName = inferredHost
+				tlsConfig = tlsConfigCopy
+			}
+
+			// Since this method is primarily used within a "Connection: Upgrade" call we assume the caller is
+			// going to write HTTP/1.1 request to the wire. http2 should not be allowed in the TLSConfig.NextProtos,
+			// so we explicitly set that here. We only do this check if the TLSConfig support http/1.1.
+			if supportsHTTP11(tlsConfig.NextProtos) {
+				tlsConfig = tlsConfig.Clone()
+				tlsConfig.NextProtos = []string{"http/1.1"}
+			}
+
+			tlsConn := tls.Client(netConn, tlsConfig)
+			if err := tlsConn.HandshakeContext(ctx); err != nil {
+				netConn.Close()
+				return nil, err
+			}
+			return tlsConn, nil
+		} else {
+			// Dial.
+			tlsDialer := tls.Dialer{
+				Config: tlsConfig,
+			}
+			return tlsDialer.DialContext(ctx, "tcp", dialAddr)
+		}
+	default:
+		return nil, fmt.Errorf("unknown scheme: %s", url.Scheme)
+	}
+}
+
+func supportsHTTP11(nextProtos []string) bool {
+	if len(nextProtos) == 0 {
+		return true
+	}
+	for _, proto := range nextProtos {
+		if proto == "http/1.1" {
+			return true
+		}
+	}
+	return false
+}