feat: add an annotation for ignoring URI case in HTTP match (#174)

Signed-off-by: charlie <qianglin98@qq.com>

pkg/ingress/kube/annotations/ignore_case.go

@@ -0,0 +1,54 @@
+// 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
+
+import (
+	networking "istio.io/api/networking/v1alpha3"
+)
+
+const (
+	enableIgnoreCase = "ignore-path-case"
+)
+
+type IgnoreCaseConfig struct {
+	IgnoreUriCase bool
+}
+
+type ignoreCaseMatching struct{}
+
+func (m ignoreCaseMatching) ApplyRoute(route *networking.HTTPRoute, config *Ingress) {
+	if config == nil || config.IgnoreCase == nil || !config.IgnoreCase.IgnoreUriCase {
+		return
+	}
+
+	for _, v := range route.Match {
+		v.IgnoreUriCase = true
+	}
+}
+
+func (m ignoreCaseMatching) Parse(annotations Annotations, config *Ingress, _ *GlobalContext) error {
+	if !needIgnoreCaseMatch(annotations) {
+		return nil
+	}
+
+	config.IgnoreCase = &IgnoreCaseConfig{}
+	config.IgnoreCase.IgnoreUriCase, _ = annotations.ParseBoolASAP(enableIgnoreCase)
+
+	return nil
+}
+
+func needIgnoreCaseMatch(annotation Annotations) bool {
+	return annotation.HasASAP(enableIgnoreCase)
+}