Re-add the legacy wsstream package and deprecate it

staging/src/k8s.io/apiserver/pkg/util/wsstream/legacy.go

@@ -0,0 +1,59 @@
+/*
+Copyright 2023 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.
+*/
+
+// Deprecated: This WebSockets package under apiserver is no longer in use.
+// Please use the apimachinery version of the package at:
+//
+//	k8s.io/apimachinery/pkg/util/httpstream/wsstream
+package wsstream
+
+import apimachinerywsstream "k8s.io/apimachinery/pkg/util/httpstream/wsstream"
+
+// Aliases for all exported symbols previously in "conn.go"
+const (
+	ChannelWebSocketProtocol       = apimachinerywsstream.ChannelWebSocketProtocol
+	Base64ChannelWebSocketProtocol = apimachinerywsstream.Base64ChannelWebSocketProtocol
+)
+
+type ChannelType = apimachinerywsstream.ChannelType
+
+const (
+	IgnoreChannel    = apimachinerywsstream.IgnoreChannel
+	ReadChannel      = apimachinerywsstream.ReadChannel
+	WriteChannel     = apimachinerywsstream.WriteChannel
+	ReadWriteChannel = apimachinerywsstream.ReadWriteChannel
+)
+
+type ChannelProtocolConfig = apimachinerywsstream.ChannelProtocolConfig
+
+var (
+	IsWebSocketRequest         = apimachinerywsstream.IsWebSocketRequest
+	IgnoreReceives             = apimachinerywsstream.IgnoreReceives
+	NewDefaultChannelProtocols = apimachinerywsstream.NewDefaultChannelProtocols
+)
+
+type Conn = apimachinerywsstream.Conn
+
+var NewConn = apimachinerywsstream.NewConn
+
+// Aliases for all exported symbols previously in "stream.go"
+type ReaderProtocolConfig = apimachinerywsstream.ReaderProtocolConfig
+
+var NewDefaultReaderProtocols = apimachinerywsstream.NewDefaultReaderProtocols
+
+type Reader = apimachinerywsstream.Reader
+
+var NewReader = apimachinerywsstream.NewReader