feat: add crd gen

Signed-off-by: runzexia <runzexia@yunify.com>

vendor/k8s.io/apiserver/pkg/authentication/request/websocket/protocol.go

@@ -0,0 +1,108 @@
+/*
+Copyright 2017 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 (
+	"encoding/base64"
+	"errors"
+	"net/http"
+	"net/textproto"
+	"strings"
+	"unicode/utf8"
+
+	"k8s.io/apiserver/pkg/authentication/authenticator"
+	"k8s.io/apiserver/pkg/util/wsstream"
+)
+
+const bearerProtocolPrefix = "base64url.bearer.authorization.k8s.io."
+
+var protocolHeader = textproto.CanonicalMIMEHeaderKey("Sec-WebSocket-Protocol")
+
+var errInvalidToken = errors.New("invalid bearer token")
+
+// ProtocolAuthenticator allows a websocket connection to provide a bearer token as a subprotocol
+// in the format "base64url.bearer.authorization.<base64url-without-padding(bearer-token)>"
+type ProtocolAuthenticator struct {
+	// auth is the token authenticator to use to validate the token
+	auth authenticator.Token
+}
+
+func NewProtocolAuthenticator(auth authenticator.Token) *ProtocolAuthenticator {
+	return &ProtocolAuthenticator{auth}
+}
+
+func (a *ProtocolAuthenticator) AuthenticateRequest(req *http.Request) (*authenticator.Response, bool, error) {
+	// Only accept websocket connections
+	if !wsstream.IsWebSocketRequest(req) {
+		return nil, false, nil
+	}
+
+	token := ""
+	sawTokenProtocol := false
+	filteredProtocols := []string{}
+	for _, protocolHeader := range req.Header[protocolHeader] {
+		for _, protocol := range strings.Split(protocolHeader, ",") {
+			protocol = strings.TrimSpace(protocol)
+
+			if !strings.HasPrefix(protocol, bearerProtocolPrefix) {
+				filteredProtocols = append(filteredProtocols, protocol)
+				continue
+			}
+
+			if sawTokenProtocol {
+				return nil, false, errors.New("multiple base64.bearer.authorization tokens specified")
+			}
+			sawTokenProtocol = true
+
+			encodedToken := strings.TrimPrefix(protocol, bearerProtocolPrefix)
+			decodedToken, err := base64.RawURLEncoding.DecodeString(encodedToken)
+			if err != nil {
+				return nil, false, errors.New("invalid base64.bearer.authorization token encoding")
+			}
+			if !utf8.Valid(decodedToken) {
+				return nil, false, errors.New("invalid base64.bearer.authorization token")
+			}
+			token = string(decodedToken)
+		}
+	}
+
+	// Must pass at least one other subprotocol so that we can remove the one containing the bearer token,
+	// and there is at least one to echo back to the client
+	if len(token) > 0 && len(filteredProtocols) == 0 {
+		return nil, false, errors.New("missing additional subprotocol")
+	}
+
+	if len(token) == 0 {
+		return nil, false, nil
+	}
+
+	resp, ok, err := a.auth.AuthenticateToken(req.Context(), token)
+
+	// on success, remove the protocol with the token
+	if ok {
+		// https://tools.ietf.org/html/rfc6455#section-11.3.4 indicates the Sec-WebSocket-Protocol header may appear multiple times
+		// in a request, and is logically the same as a single Sec-WebSocket-Protocol header field that contains all values
+		req.Header.Set(protocolHeader, strings.Join(filteredProtocols, ","))
+	}
+
+	// If the token authenticator didn't error, provide a default error
+	if !ok && err == nil {
+		err = errInvalidToken
+	}
+
+	return resp, ok, err
+}