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rewrite.go
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rewrite.go
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// 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 (
"regexp"
"strings"
networking "istio.io/api/networking/v1alpha3"
)
const (
rewritePath = "rewrite-path"
rewriteTarget = "rewrite-target"
useRegex = "use-regex"
fullPathRegex = "full-path-regex"
upstreamVhost = "upstream-vhost"
re2Regex = "\\$[0-9]"
)
var (
_ Parser = &rewrite{}
_ RouteHandler = &rewrite{}
)
type RewriteConfig struct {
RewriteTarget string
UseRegex bool
FullPathRegex bool
RewriteHost string
RewritePath string
}
type rewrite struct{}
func (r rewrite) Parse(annotations Annotations, config *Ingress, _ *GlobalContext) error {
if !needRewriteConfig(annotations) {
return nil
}
rewriteConfig := &RewriteConfig{}
rewriteConfig.RewriteTarget, _ = annotations.ParseStringASAP(rewriteTarget)
rewriteConfig.UseRegex, _ = annotations.ParseBoolASAP(useRegex)
rewriteConfig.FullPathRegex, _ = annotations.ParseBoolForHigress(fullPathRegex)
rewriteConfig.RewriteHost, _ = annotations.ParseStringASAP(upstreamVhost)
rewriteConfig.RewritePath, _ = annotations.ParseStringForHigress(rewritePath)
if rewriteConfig.RewritePath == "" && rewriteConfig.RewriteTarget != "" {
// We should convert nginx regex rule to envoy regex rule.
rewriteConfig.RewriteTarget = convertToRE2(rewriteConfig.RewriteTarget)
}
config.Rewrite = rewriteConfig
return nil
}
func (r rewrite) ApplyRoute(route *networking.HTTPRoute, config *Ingress) {
rewriteConfig := config.Rewrite
if rewriteConfig == nil || (rewriteConfig.RewriteTarget == "" &&
rewriteConfig.RewriteHost == "" && rewriteConfig.RewritePath == "") {
return
}
route.Rewrite = &networking.HTTPRewrite{}
if rewriteConfig.RewritePath != "" {
route.Rewrite.Uri = rewriteConfig.RewritePath
for _, match := range route.Match {
if strings.HasSuffix(match.Uri.GetPrefix(), "/") {
if !strings.HasSuffix(route.Rewrite.Uri, "/") {
route.Rewrite.Uri += "/"
}
break
}
}
} else if rewriteConfig.RewriteTarget != "" {
uri := route.Match[0].Uri
if uri.GetExact() != "" {
route.Rewrite.UriRegex = &networking.RegexMatchAndSubstitute{
Pattern: uri.GetExact(),
Substitution: rewriteConfig.RewriteTarget,
}
} else if uri.GetPrefix() != "" {
route.Rewrite.UriRegex = &networking.RegexMatchAndSubstitute{
Pattern: uri.GetPrefix(),
Substitution: rewriteConfig.RewriteTarget,
}
} else {
route.Rewrite.UriRegex = &networking.RegexMatchAndSubstitute{
Pattern: uri.GetRegex(),
Substitution: rewriteConfig.RewriteTarget,
}
}
}
if rewriteConfig.RewriteHost != "" {
route.Rewrite.Authority = rewriteConfig.RewriteHost
}
}
func convertToRE2(target string) string {
if match, err := regexp.MatchString(re2Regex, target); err != nil || !match {
return target
}
return strings.ReplaceAll(target, "$", "\\")
}
func NeedRegexMatch(annotations map[string]string) bool {
target, _ := Annotations(annotations).ParseStringASAP(rewriteTarget)
useRegex, _ := Annotations(annotations).ParseBoolASAP(useRegex)
fullPathRegex, _ := Annotations(annotations).ParseBoolForHigress(fullPathRegex)
return useRegex || target != "" || fullPathRegex
}
func needRewriteConfig(annotations Annotations) bool {
return annotations.HasASAP(rewriteTarget) || annotations.HasASAP(useRegex) ||
annotations.HasASAP(upstreamVhost) || annotations.HasHigress(rewritePath) || annotations.HasHigress(fullPathRegex)
}