/
recorder.go
166 lines (152 loc) · 4.17 KB
/
recorder.go
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
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
package httpmock
import (
"fmt"
"log"
"mime"
"net"
"net/http"
"net/url"
"path/filepath"
"time"
)
type Recorder struct {
Logger *log.Logger
}
func (rec Recorder) Record(uri string, scnName string) error {
client := newHTTPClient()
var seq Sequence
scn, created, err := InitScenario(scnName + ".json")
if err != nil {
return fmt.Errorf("cannot open scenario file: %s", err)
}
if !created {
rec.logf("Updating existing scenario: it contains %d sequences.\n", scn.Count())
}
// Record a new sequence
Loop:
for redirect := 0; redirect <= 10; redirect++ {
resp, err := client.Get(uri)
// on error
if err != nil {
step := Step{
RequestURL: uri,
Response: NewResponse(resp),
Err: err.Error(),
}
seq.Steps = append(seq.Steps, step)
break Loop
}
// Add step to sequence and record body file
r := NewResponse(resp)
// On success
switch {
// Record and follow redirects steps:
case resp.StatusCode >= 300 && resp.StatusCode < 400:
// Redirect
location := resp.Header.Get("Location")
rec.logf("Recording redirect to: %s", location)
step := Step{
Method: "GET",
RequestURL: uri,
Response: r,
}
seq.Steps = append(seq.Steps, step)
_ = resp.Body.Close()
// Retry resolving the next link, with new discovered location
uri, err = formatRedirectUrl(uri, location)
if err != nil {
// Not a valid URL, do not redirect further
break Loop
}
default:
rec.logf("Recording response: %d", resp.StatusCode)
prefix := filepath.Base(scnName)
r.BodyFilename = fmt.Sprintf("%s-%d-%d%s", prefix, scn.Count()+1, redirect+1, extension(r.Header))
step := Step{
Method: "GET",
RequestURL: uri,
Response: r,
}
if err := step.SaveBody(resp.Body, filepath.Join(filepath.Dir(scnName), r.BodyFilename)); err != nil {
rec.logf("Cannot save body file %s: %s\n", r.BodyFilename, err)
}
seq.Steps = append(seq.Steps, step)
_ = resp.Body.Close()
break Loop
}
}
// Add Sequence to scenario
if err = scn.AddSequence(seq); err != nil {
return fmt.Errorf("cannot add sequence to scenario: %s", err)
}
// Save file
filename := scnName + ".json"
if err := scn.SaveTo(filename); err != nil {
return fmt.Errorf("cannot save sequence to file %s: %s", filename, err)
}
// Save basic .url files
filename = scnName + ".url"
if err := scn.SaveAsURLList(filename); err != nil {
return fmt.Errorf("cannot save url list to file %s: %s", filename, err)
}
return nil
}
func (rec Recorder) logf(format string, a ...interface{}) {
rec.Logger.Printf(format, a...)
}
//=============================================================================
// Helpers
// newHTTPClient returns an http.Client that does not automatically follow redirects.
func newHTTPClient() *http.Client {
transport := &http.Transport{
DialContext: (&net.Dialer{
Timeout: 5 * time.Second,
}).DialContext,
TLSHandshakeTimeout: 5 * time.Second,
}
client := http.Client{
Timeout: time.Second * 15,
Transport: transport,
CheckRedirect: func(req *http.Request, via []*http.Request) error {
return http.ErrUseLastResponse
},
}
return &client
}
// formatRedirectUrl returns a valid full URL from an original URL and a "Location" Header.
// It support local redirection on same host.
func formatRedirectUrl(originalUrl, locationHeader string) (string, error) {
newUrl, err := url.Parse(locationHeader)
if err != nil {
return "", err
}
// This is a relative URL, we need to use the host from original URL
if newUrl.Host == "" && newUrl.Scheme == "" {
oldUrl, err := url.Parse(originalUrl)
if err != nil {
return "", err
}
newUrl.Host = oldUrl.Host
newUrl.Scheme = oldUrl.Scheme
}
return newUrl.String(), nil
}
// extension is used to get the extension to record HTTP response body.
func extension(header http.Header) string {
content := header["Content-Type"]
for _, typ := range content {
if ext, err := mime.ExtensionsByType(typ); err == nil {
// We return the longest known extension
bestExtension := ""
for _, e := range ext {
if len(e) > len(bestExtension) {
bestExtension = e
}
}
if bestExtension != "" {
return bestExtension
}
}
}
return ".data"
}