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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.Modifier", modifierFromJSON)
}
type modifier struct {
name, value string
}
type modifierJSON struct {
Name string `json:"name"`
Value string `json:"value"`
Scope []parse.ModifierType `json:"scope"`
}
// ModifyRequest sets the header at name with value on the request.
func (m *modifier) ModifyRequest(req *http.Request) error {
return proxyutil.RequestHeader(req).Set(m.name, m.value)
}
// ModifyResponse sets the header at name with value on the response.
func (m *modifier) ModifyResponse(res *http.Response) error {
return proxyutil.ResponseHeader(res).Set(m.name, m.value)
}
// NewModifier returns a modifier that will set the header at name with
// the given value for both requests and responses. If the header name already
// exists all values will be overwritten.
func NewModifier(name, value string) martian.RequestResponseModifier {
return &modifier{
name: http.CanonicalHeaderKey(name),
value: value,
}
}
// modifierFromJSON takes a JSON message as a byte slice and returns
// a headerModifier and an error.
//
// Example JSON configuration message:
// {
// "scope": ["request", "result"],
// "name": "X-Martian",
// "value": "true"
// }
func modifierFromJSON(b []byte) (*parse.Result, error) {
msg := &modifierJSON{}
if err := json.Unmarshal(b, msg); err != nil {
return nil, err
}
modifier := NewModifier(msg.Name, msg.Value)
return parse.NewResult(modifier, msg.Scope)
}
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