feat: Enhance SSL passthrough support (#3943)

Signed-off-by: zijiren233 <pyh1670605849@gmail.com>

pkg/ingress/kube/annotations/ssl_passthrough.go

@@ -0,0 +1,34 @@
+// Copyright (c) 2022 Alibaba Group Holding Ltd.
+//
+// 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 annotations
+
+const sslPassthroughAnnotation = "ssl-passthrough"
+
+var _ Parser = &sslPassthrough{}
+
+type SSLPassthroughConfig struct {
+	Enabled bool
+}
+
+type sslPassthrough struct{}
+
+func (s sslPassthrough) Parse(annotations Annotations, config *Ingress, _ *GlobalContext) error {
+	enabled, err := annotations.ParseBoolASAP(sslPassthroughAnnotation)
+	if err != nil {
+		return nil
+	}
+	config.SSLPassthrough = &SSLPassthroughConfig{Enabled: enabled}
+	return nil
+}