blob: 50c537c62efb270ef187e417cd734c6e91788e08 (
plain)
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
183
184
185
186
187
188
189
190
|
module smtp
/*
*
* smtp module
* Created by: nedimf (07/2020)
*/
import net
import encoding.base64
import strings
import time
import io
const (
recv_size = 128
)
enum ReplyCode {
ready = 220
close = 221
auth_ok = 235
action_ok = 250
mail_start = 354
}
pub enum BodyType {
text
html
}
pub struct Client {
mut:
conn net.TcpConn
reader io.BufferedReader
pub:
server string
port int = 25
username string
password string
from string
pub mut:
is_open bool
}
pub struct Mail {
from string
to string
cc string
bcc string
date time.Time = time.now()
subject string
body_type BodyType
body string
}
// new_client returns a new SMTP client and connects to it
pub fn new_client(config Client) ?&Client {
mut c := &Client{
...config
}
c.reconnect() ?
return c
}
// reconnect reconnects to the SMTP server if the connection was closed
pub fn (mut c Client) reconnect() ? {
if c.is_open {
return error('Already connected to server')
}
conn := net.dial_tcp('$c.server:$c.port') or { return error('Connecting to server failed') }
c.conn = conn
c.reader = io.new_buffered_reader(reader: c.conn)
c.expect_reply(.ready) or { return error('Received invalid response from server') }
c.send_ehlo() or { return error('Sending EHLO packet failed') }
c.send_auth() or { return error('Authenticating to server failed') }
c.is_open = true
}
// send sends an email
pub fn (mut c Client) send(config Mail) ? {
if !c.is_open {
return error('Disconnected from server')
}
from := if config.from != '' { config.from } else { c.from }
c.send_mailfrom(from) or { return error('Sending mailfrom failed') }
c.send_mailto(config.to) or { return error('Sending mailto failed') }
c.send_data() or { return error('Sending mail data failed') }
c.send_body(Mail{
...config
from: from
}) or { return error('Sending mail body failed') }
}
// quit closes the connection to the server
pub fn (mut c Client) quit() ? {
c.send_str('QUIT\r\n') ?
c.expect_reply(.close) ?
c.conn.close() ?
c.is_open = false
}
// expect_reply checks if the SMTP server replied with the expected reply code
fn (mut c Client) expect_reply(expected ReplyCode) ? {
bytes := io.read_all(reader: c.conn) ?
str := bytes.bytestr().trim_space()
$if smtp_debug ? {
eprintln('\n\n[RECV]')
eprint(str)
}
if str.len >= 3 {
status := str[..3].int()
if ReplyCode(status) != expected {
return error('Received unexpected status code $status, expecting $expected')
}
} else {
return error('Recieved unexpected SMTP data: $str')
}
}
[inline]
fn (mut c Client) send_str(s string) ? {
$if smtp_debug ? {
eprintln('\n\n[SEND START]')
eprint(s.trim_space())
eprintln('\n[SEND END]')
}
c.conn.write(s.bytes()) ?
}
[inline]
fn (mut c Client) send_ehlo() ? {
c.send_str('EHLO $c.server\r\n') ?
c.expect_reply(.action_ok) ?
}
[inline]
fn (mut c Client) send_auth() ? {
if c.username.len == 0 {
return
}
mut sb := strings.new_builder(100)
sb.write_b(0)
sb.write_string(c.username)
sb.write_b(0)
sb.write_string(c.password)
a := sb.str()
auth := 'AUTH PLAIN ${base64.encode_str(a)}\r\n'
c.send_str(auth) ?
c.expect_reply(.auth_ok) ?
}
fn (mut c Client) send_mailfrom(from string) ? {
c.send_str('MAIL FROM: <$from>\r\n') ?
c.expect_reply(.action_ok) ?
}
fn (mut c Client) send_mailto(to string) ? {
c.send_str('RCPT TO: <$to>\r\n') ?
c.expect_reply(.action_ok) ?
}
fn (mut c Client) send_data() ? {
c.send_str('DATA\r\n') ?
c.expect_reply(.mail_start) ?
}
fn (mut c Client) send_body(cfg Mail) ? {
is_html := cfg.body_type == .html
date := cfg.date.utc_string().trim_right(' UTC') // TODO
mut sb := strings.new_builder(200)
sb.write_string('From: $cfg.from\r\n')
sb.write_string('To: <$cfg.to>\r\n')
sb.write_string('Cc: <$cfg.cc>\r\n')
sb.write_string('Bcc: <$cfg.bcc>\r\n')
sb.write_string('Date: $date\r\n')
sb.write_string('Subject: $cfg.subject\r\n')
if is_html {
sb.write_string('Content-Type: text/html; charset=ISO-8859-1')
}
sb.write_string('\r\n\r\n')
sb.write_string(cfg.body)
sb.write_string('\r\n.\r\n')
c.send_str(sb.str()) ?
c.expect_reply(.action_ok) ?
}
|
