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// Copyright Istio 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 matcher
import (
"strings"
)
import (
matcherpb "github.com/envoyproxy/go-control-plane/envoy/type/matcher/v3"
)
// StringMatcher creates a string matcher for v.
func StringMatcher(v string) *matcherpb.StringMatcher {
return StringMatcherWithPrefix(v, "")
}
// StringMatcherRegex creates a regex string matcher for regex.
func StringMatcherRegex(regex string) *matcherpb.StringMatcher {
return &matcherpb.StringMatcher{
MatchPattern: &matcherpb.StringMatcher_SafeRegex{
SafeRegex: &matcherpb.RegexMatcher{
EngineType: &matcherpb.RegexMatcher_GoogleRe2{
GoogleRe2: &matcherpb.RegexMatcher_GoogleRE2{},
},
Regex: regex,
},
},
}
}
// StringMatcherWithPrefix creates a string matcher for v with the extra prefix inserted to the
// created string matcher, note the prefix is ignored if v is wildcard ("*").
// The wildcard "*" will be generated as ".+" instead of ".*".
func StringMatcherWithPrefix(v, prefix string) *matcherpb.StringMatcher {
switch {
// Check if v is "*" first to make sure we won't generate an empty prefix/suffix StringMatcher,
// the Envoy StringMatcher doesn't allow empty prefix/suffix.
case v == "*":
return StringMatcherRegex(".+")
case strings.HasPrefix(v, "*"):
if prefix == "" {
return &matcherpb.StringMatcher{
MatchPattern: &matcherpb.StringMatcher_Suffix{
Suffix: strings.TrimPrefix(v, "*"),
},
}
}
return StringMatcherRegex(prefix + ".*" + strings.TrimPrefix(v, "*"))
case strings.HasSuffix(v, "*"):
return &matcherpb.StringMatcher{
MatchPattern: &matcherpb.StringMatcher_Prefix{
Prefix: prefix + strings.TrimSuffix(v, "*"),
},
}
default:
return &matcherpb.StringMatcher{
MatchPattern: &matcherpb.StringMatcher_Exact{
Exact: prefix + v,
},
}
}
}