-
Notifications
You must be signed in to change notification settings - Fork 0
/
cloudflare.go
182 lines (169 loc) · 4.2 KB
/
cloudflare.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
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
package main
import (
"bytes"
"encoding/json"
"fmt"
"io"
"net"
"net/http"
"time"
)
const (
baseURL = "https://api.cloudflare.com/client/v4/"
)
// CloudFlareUpdater implements an updater for CloudFlare
type CloudFlareUpdater struct {
authToken string
zoneID string
recordName string
recordType string
client *http.Client
}
type cfPage struct {
Page int `json:"page"`
PerPage int `json:"per_page"`
Count int `json:"count"`
TotalCount int `json:"total_count"`
}
type cfError struct {
Code int `json:"code"`
Message string `json:"message"`
}
type cfResponse struct {
Result interface{} `json:"result"`
Success bool `json:"success"`
Errors []cfError `json:"errors"`
Messages []string `json:"messages"`
Info cfPage `json:"result_info"`
}
type cfRecord struct {
Type string `json:"type"`
Name string `json:"name"`
Content string `json:"content"`
TTL int `json:"ttl"`
}
func newResponse() *cfResponse {
return &cfResponse{
Result: []map[string]interface{}{},
}
}
// NewCloudFlareUpdater returns an updater for CloudFlare
func NewCloudFlareUpdater(tok string, zoneID string, recordName string, recordType string) *CloudFlareUpdater {
if len(recordType) == 0 {
recordType = "A"
}
return &CloudFlareUpdater{
authToken: tok,
zoneID: zoneID,
recordName: recordName,
recordType: recordType,
client: &http.Client{
Transport: &http.Transport{
IdleConnTimeout: 30 * time.Second,
},
},
}
}
func (u *CloudFlareUpdater) newRequest(method string, URL string, body io.Reader) (*http.Request, error) {
req, err := http.NewRequest(method, URL, body)
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/json")
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", u.authToken))
return req, nil
}
func (u *CloudFlareUpdater) doRequest(method string, URL string, body io.Reader) (*cfResponse, error) {
response := newResponse()
req, err := u.newRequest(method, URL, body)
if err != nil {
return response, err
}
resp, err := u.client.Do(req)
if err != nil {
return response, err
}
defer resp.Body.Close()
if err = json.NewDecoder(resp.Body).Decode(response); err != nil {
return response, err
}
if !response.Success {
for _, e := range response.Errors {
if err != nil {
err = fmt.Errorf("%d: %s %w", e.Code, e.Message, err)
} else {
err = fmt.Errorf("%d: %s", e.Code, e.Message)
}
}
return response, err
}
return response, nil
}
func (u *CloudFlareUpdater) getRecord(name string, recordType string) (string, cfRecord, error) {
rec := cfRecord{Name: name, Type: recordType, TTL: 1}
id := ""
dnsURL := fmt.Sprintf("%s/zones/%s/dns_records?name=%s&type=%s", baseURL, u.zoneID, name, recordType)
response, err := u.doRequest("GET", dnsURL, nil)
if err != nil {
return id, rec, err
}
rm, ok := response.Result.([]interface{})
if !ok {
return id, rec, fmt.Errorf("unexpected response type: %T", response.Result)
}
if len(rm) == 0 {
return id, rec, nil
}
first, ok := rm[0].(map[string]interface{})
if !ok {
return id, rec, fmt.Errorf("unexpected response type: %T", rm[0])
}
if n, ok := first["name"]; ok {
rec.Name = n.(string)
}
if t, ok := first["type"]; ok {
rec.Type = t.(string)
}
if c, ok := first["content"]; ok {
rec.Content = c.(string)
}
if t, ok := first["ttl"]; ok {
rec.TTL = int(t.(float64))
}
if i, ok := first["id"]; ok {
id = i.(string)
}
return id, rec, nil
}
// Update updates the DNS record with the IP
func (u *CloudFlareUpdater) Update(ip net.IP) error {
id, rec, err := u.getRecord(u.recordName, u.recordType)
if err != nil {
return err
}
if len(id) == 0 {
return fmt.Errorf("missing record: %s", u.recordName)
}
rec.Content = ip.String()
b, err := json.Marshal(rec)
if err != nil {
return err
}
body := bytes.NewBuffer(b)
dnsURL := fmt.Sprintf("%s/zones/%s/dns_records/%s", baseURL, u.zoneID, id)
response, err := u.doRequest("PUT", dnsURL, body)
if err != nil {
return err
}
if !response.Success {
for _, e := range response.Errors {
if err != nil {
err = fmt.Errorf("%d: %s %w", e.Code, e.Message, err)
} else {
err = fmt.Errorf("%d: %s", e.Code, e.Message)
}
}
return err
}
return nil
}