1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
// 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 martianurl provides utilities for modifying, filtering,
// and verifying URLs in martian.Proxy.
package martianurl
import (
"encoding/json"
"net/http"
"net/url"
"github.com/google/martian/v3"
"github.com/google/martian/v3/parse"
)
// Modifier alters the request URL fields to match the fields of
// url and adds a X-Forwarded-Url header that contains the original
// value of the request URL.
type Modifier struct {
url *url.URL
}
type modifierJSON struct {
Scheme string `json:"scheme"`
Host string `json:"host"`
Path string `json:"path"`
Query string `json:"query"`
Scope []parse.ModifierType `json:"scope"`
}
func init() {
parse.Register("url.Modifier", modifierFromJSON)
}
// ModifyRequest sets the fields of req.URL to m.Url if they are not the zero value.
func (m *Modifier) ModifyRequest(req *http.Request) error {
if m.url.Scheme != "" {
req.URL.Scheme = m.url.Scheme
}
if m.url.Host != "" {
req.URL.Host = m.url.Host
}
if m.url.Path != "" {
req.URL.Path = m.url.Path
}
if m.url.RawQuery != "" {
req.URL.RawQuery = m.url.RawQuery
}
if m.url.Fragment != "" {
req.URL.Fragment = m.url.Fragment
}
return nil
}
// NewModifier overrides the url of the request.
func NewModifier(url *url.URL) martian.RequestModifier {
return &Modifier{
url: url,
}
}
// modifierFromJSON builds a martianurl.Modifier from JSON.
//
// Example modifier JSON:
// {
// "martianurl.Modifier": {
// "scope": ["request"],
// "scheme": "https",
// "host": "www.google.com",
// "path": "/proxy",
// "query": "testing=true"
// }
// }
func modifierFromJSON(b []byte) (*parse.Result, error) {
msg := &modifierJSON{}
if err := json.Unmarshal(b, msg); err != nil {
return nil, err
}
mod := NewModifier(&url.URL{
Scheme: msg.Scheme,
Host: msg.Host,
Path: msg.Path,
RawQuery: msg.Query,
})
return parse.NewResult(mod, msg.Scope)
}
|
