email.go
2.74 KB
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
package webutility
// TODO(markO): test test test test test (and open source?)
import (
"crypto/tls"
"errors"
"fmt"
"net/smtp"
"strings"
)
type EmailConfig struct {
ServerName string
Identity string
Username string
Password string
Host string
Port int
}
func NewEmailConfig(ident, uname, pword, host string, port int) *EmailConfig {
return &EmailConfig{
ServerName: host + fmt.Sprintf(":%d", port),
Identity: ident,
Username: uname,
Password: pword,
Host: host,
Port: port,
}
}
type Email struct {
To []string
From string
Subject string
Body string
}
func NewEmail(to []string, from, subject, body string) *Email {
return &Email{
To: to,
From: from,
Subject: subject,
Body: body,
}
}
func SendEmail(email *Email, conf *EmailConfig) error {
if email == nil {
return errors.New("no email to send")
}
if conf == nil {
// use (some?) default settings
conf = NewEmailConfig("", "marko.tikvic@to-net.rs", "quantumleap010", "mail.to-net.rs", 25)
}
c, err := smtp.Dial(conf.ServerName)
if err != nil {
return err
}
defer c.Close()
// not sure if this is needed
//if err = c.Hello(conf.ServerName); err != nil {
// return err
//}
if ok, _ := c.Extension("STARTTLS"); ok {
// disable stupid tls check for self-signed certificates
config := &tls.Config{
ServerName: conf.ServerName,
InsecureSkipVerify: true,
}
// for golang testing
//if testHookStartTLS != nil {
// testHookStartTLS(config)
//}
if err = c.StartTLS(config); err != nil {
return err
}
}
/*
// don't know what to do with this
if a != nil && c.ext != nil {
if _, ok := c.ext["AUTH"]; !ok {
return errors.New("smtp: server doesn't support AUTH")
}
if err = c.Auth(a); err != nil {
return err
}
}
*/
// Set up authentication information.
auth := smtp.PlainAuth(conf.Identity, conf.Username, conf.Password, conf.Host)
if err = c.Auth(auth); err != nil {
return err
}
if err = c.Mail(email.From); err != nil {
return err
}
for _, addr := range email.To {
if err = c.Rcpt(addr); err != nil {
return err
}
}
w, err := c.Data()
if err != nil {
return err
}
_, err = w.Write(email.Bytes())
if err != nil {
return err
}
err = w.Close()
if err != nil {
return err
}
return c.Quit()
}
func (e *Email) String() string {
var str strings.Builder
str.WriteString("From:" + e.From + "\r\n")
str.WriteString("To:")
for i, _ := range e.To {
if i > 0 {
str.WriteString(",")
}
str.WriteString(e.To[i])
}
str.WriteString("\r\n")
str.WriteString("Subject:" + e.Subject + "\r\n")
// body
str.WriteString("\r\n" + e.Body + "\r\n")
return str.String()
}
func (e *Email) Bytes() []byte {
return []byte(e.String())
}