mirror of
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102 lines
2.5 KiB
Go
102 lines
2.5 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 martianurl provides utilities for modifying, filtering,
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// and verifying URLs in martian.Proxy.
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package martianurl
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import (
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"encoding/json"
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"net/http"
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"net/url"
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"github.com/google/martian"
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"github.com/google/martian/parse"
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)
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// Modifier alters the request URL fields to match the fields of
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// url and adds a X-Forwarded-Url header that contains the original
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// value of the request URL.
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type Modifier struct {
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url *url.URL
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}
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type modifierJSON struct {
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Scheme string `json:"scheme"`
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Host string `json:"host"`
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Path string `json:"path"`
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Query string `json:"query"`
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Scope []parse.ModifierType `json:"scope"`
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}
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func init() {
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parse.Register("url.Modifier", modifierFromJSON)
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}
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// ModifyRequest sets the fields of req.URL to m.Url if they are not the zero value.
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func (m *Modifier) ModifyRequest(req *http.Request) error {
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if m.url.Scheme != "" {
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req.URL.Scheme = m.url.Scheme
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}
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if m.url.Host != "" {
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req.URL.Host = m.url.Host
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}
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if m.url.Path != "" {
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req.URL.Path = m.url.Path
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}
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if m.url.RawQuery != "" {
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req.URL.RawQuery = m.url.RawQuery
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}
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if m.url.Fragment != "" {
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req.URL.Fragment = m.url.Fragment
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}
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return nil
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}
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// NewModifier overrides the url of the request.
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func NewModifier(url *url.URL) martian.RequestModifier {
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return &Modifier{
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url: url,
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}
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}
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// modifierFromJSON builds a martianurl.Modifier from JSON.
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//
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// Example modifier JSON:
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// {
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// "martianurl.Modifier": {
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// "scope": ["request"],
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// "scheme": "https",
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// "host": "www.google.com",
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// "path": "/proxy",
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// "query": "testing=true"
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// }
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// }
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func modifierFromJSON(b []byte) (*parse.Result, error) {
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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(&url.URL{
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Scheme: msg.Scheme,
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Host: msg.Host,
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Path: msg.Path,
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RawQuery: msg.Query,
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})
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return parse.NewResult(mod, msg.Scope)
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}
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