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status_modifier.go
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/
status_modifier.go
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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 status contains a modifier to rewrite the status code on a response.
package status
import (
"encoding/json"
"fmt"
"net/http"
"github.com/google/martian"
"github.com/google/martian/parse"
)
type statusModifier struct {
statusCode int
}
type statusJSON struct {
StatusCode int `json:"statusCode"`
Scope []parse.ModifierType `json:"scope"`
}
func init() {
parse.Register("status.Modifier", modifierFromJSON)
}
// ModifyResponse overwrites the status text and code on an HTTP response and
// returns nil.
func (s *statusModifier) ModifyResponse(res *http.Response) error {
res.StatusCode = s.statusCode
res.Status = fmt.Sprintf("%d %s", s.statusCode, http.StatusText(s.statusCode))
return nil
}
// NewModifier constructs a statusModifier that overrides response status
// codes with the HTTP status code provided.
func NewModifier(statusCode int) martian.ResponseModifier {
return &statusModifier{
statusCode: statusCode,
}
}
// modifierFromJSON builds a status.Modifier from JSON.
//
// Example JSON:
// {
// "status.Modifier": {
// "scope": ["response"],
// "statusCode": 401
// }
// }
func modifierFromJSON(b []byte) (*parse.Result, error) {
msg := &statusJSON{}
if err := json.Unmarshal(b, msg); err != nil {
return nil, err
}
return parse.NewResult(NewModifier(msg.StatusCode), msg.Scope)
}