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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 querystring contains a modifier to rewrite query strings in a request.
package querystring
import (
"encoding/json"
"net/http"
"github.com/google/martian/v3"
"github.com/google/martian/v3/parse"
)
func init() {
parse.Register("querystring.Modifier", modifierFromJSON)
}
type modifier struct {
key, value string
}
type modifierJSON struct {
Name string `json:"name"`
Value string `json:"value"`
Scope []parse.ModifierType `json:"scope"`
}
// ModifyRequest modifies the query string of the request with the given key and value.
func (m *modifier) ModifyRequest(req *http.Request) error {
query := req.URL.Query()
query.Set(m.key, m.value)
req.URL.RawQuery = query.Encode()
return nil
}
// NewModifier returns a request modifier that will set the query string
// at key with the given value. If the query string key already exists all
// values will be overwritten.
func NewModifier(key, value string) martian.RequestModifier {
return &modifier{
key: key,
value: value,
}
}
// modifierFromJSON takes a JSON message as a byte slice and returns
// a querystring.modifier and an error.
//
// Example JSON:
// {
// "name": "param",
// "value": "true",
// "scope": ["request", "response"]
// }
func modifierFromJSON(b []byte) (*parse.Result, error) {
msg := &modifierJSON{}
if err := json.Unmarshal(b, msg); err != nil {
return nil, err
}
return parse.NewResult(NewModifier(msg.Name, msg.Value), msg.Scope)
}
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