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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"
- "github.com/google/martian/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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