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header.go
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header.go
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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"
routepb "github.com/envoyproxy/go-control-plane/envoy/config/route/v3"
matcherpb "github.com/envoyproxy/go-control-plane/envoy/type/matcher/v3"
)
// HeaderMatcher converts a key, value string pair to a corresponding HeaderMatcher.
func HeaderMatcher(k, v string) *routepb.HeaderMatcher {
// We must check "*" first to make sure we'll generate a non empty value in the prefix/suffix case.
// Empty prefix/suffix value is invalid in HeaderMatcher.
if v == "*" {
return &routepb.HeaderMatcher{
Name: k,
HeaderMatchSpecifier: &routepb.HeaderMatcher_PresentMatch{
PresentMatch: true,
},
}
} else if strings.HasPrefix(v, "*") {
return &routepb.HeaderMatcher{
Name: k,
HeaderMatchSpecifier: &routepb.HeaderMatcher_SuffixMatch{
SuffixMatch: v[1:],
},
}
} else if strings.HasSuffix(v, "*") {
return &routepb.HeaderMatcher{
Name: k,
HeaderMatchSpecifier: &routepb.HeaderMatcher_PrefixMatch{
PrefixMatch: v[:len(v)-1],
},
}
}
return &routepb.HeaderMatcher{
Name: k,
HeaderMatchSpecifier: &routepb.HeaderMatcher_ExactMatch{
ExactMatch: v,
},
}
}
// PathMatcher creates a path matcher for a path.
func PathMatcher(path string) *matcherpb.PathMatcher {
return &matcherpb.PathMatcher{
Rule: &matcherpb.PathMatcher_Path{
Path: StringMatcher(path),
},
}
}