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79 lines
2.4 KiB
Go
79 lines
2.4 KiB
Go
// Copyright 2015 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package stash provides a modifier that stores the request URL in a
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// specified header.
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package stash
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"github.com/google/martian/parse"
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)
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func init() {
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parse.Register("stash.Modifier", modifierFromJSON)
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}
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// Modifier adds a header to the request containing the current state of the URL.
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// The header will be named with the value stored in headerName.
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// There will be no validation done on this header name.
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type Modifier struct {
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headerName string
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}
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type modifierJSON struct {
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HeaderName string `json:"headerName"`
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Scope []parse.ModifierType `json:"scope"`
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}
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// NewModifier returns a RequestModifier that write the current URL into a header.
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func NewModifier(headerName string) *Modifier {
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return &Modifier{headerName: headerName}
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}
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// ModifyRequest writes the current URL into a header.
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func (m *Modifier) ModifyRequest(req *http.Request) error {
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req.Header.Set(m.headerName, req.URL.String())
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return nil
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}
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// ModifyResponse writes the same header written in the request into the response.
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func (m *Modifier) ModifyResponse(res *http.Response) error {
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res.Header.Set(m.headerName, res.Request.Header.Get(m.headerName))
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return nil
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}
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func modifierFromJSON(b []byte) (*parse.Result, error) {
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// If you would like the saved state of the URL to be written in the response you must specify
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// this modifier's scope as both request and response.
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msg := &modifierJSON{}
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if err := json.Unmarshal(b, msg); err != nil {
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return nil, err
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}
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mod := NewModifier(msg.HeaderName)
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r, err := parse.NewResult(mod, msg.Scope)
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if err != nil {
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return nil, err
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}
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if r.ResponseModifier() != nil && r.RequestModifier() == nil {
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return nil, fmt.Errorf("to write header on a response, specify scope as both request and response")
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}
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return r, nil
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}
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