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// Copyright 2015 Google Inc. All rights reserved.
//
// 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 header
import (
"encoding/json"
"net/http"
"github.com/google/martian/v3"
"github.com/google/martian/v3/parse"
"github.com/google/martian/v3/proxyutil"
)
func init() {
parse.Register("header.Blacklist", blacklistModifierFromJSON)
}
type blacklistModifier struct {
names []string
}
type blacklistModifierJSON struct {
Names []string `json:"names"`
Scope []parse.ModifierType `json:"scope"`
}
// ModifyRequest deletes all request headers based on the header name.
func (m *blacklistModifier) ModifyRequest(req *http.Request) error {
h := proxyutil.RequestHeader(req)
for _, name := range m.names {
h.Del(name)
}
return nil
}
// ModifyResponse deletes all response headers based on the header name.
func (m *blacklistModifier) ModifyResponse(res *http.Response) error {
h := proxyutil.ResponseHeader(res)
for _, name := range m.names {
h.Del(name)
}
return nil
}
// NewBlacklistModifier returns a modifier that will delete any header that
// matches a name contained in the names parameter.
func NewBlacklistModifier(names ...string) martian.RequestResponseModifier {
return &blacklistModifier{
names: names,
}
}
// blacklistModifierFromJSON takes a JSON message as a byte slice and returns
// a blacklistModifier and an error.
//
// Example JSON configuration message:
// {
// "names": ["X-Header", "Y-Header"],
// "scope": ["request", "result"]
// }
func blacklistModifierFromJSON(b []byte) (*parse.Result, error) {
msg := &blacklistModifierJSON{}
if err := json.Unmarshal(b, msg); err != nil {
return nil, err
}
return parse.NewResult(NewBlacklistModifier(msg.Names...), msg.Scope)
}
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