| 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
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232 |
1
1
1
1
1
| 'use strict';
const SMTPConnection = require('../smtp-connection');
const assign = require('../shared').assign;
const XOAuth2 = require('../xoauth2');
const EventEmitter = require('events');
/**
* Creates an element for the pool
*
* @constructor
* @param {Object} options SMTPPool instance
*/
class PoolResource extends EventEmitter {
constructor(pool) {
super();
this.pool = pool;
this.options = pool.options;
this.logger = this.pool.logger;
if (this.options.auth) {
switch ((this.options.auth.type || '').toString().toUpperCase()) {
case 'OAUTH2':
{
let oauth2 = new XOAuth2(this.options.auth, this.logger);
oauth2.provisionCallback = this.pool.mailer && this.pool.mailer.get('oauth2_provision_cb') || oauth2.provisionCallback;
this.auth = {
type: 'OAUTH2',
user: this.options.auth.user,
oauth2,
method: 'XOAUTH2'
};
oauth2.on('token', token => this.pool.mailer.emit('token', token));
oauth2.on('error', err => this.emit('error', err));
break;
}
default:
this.auth = {
type: 'LOGIN',
user: this.options.auth.user,
credentials: {
user: this.options.auth.user || '',
pass: this.options.auth.pass
},
method: (this.options.auth.method || '').trim().toUpperCase() || false
};
}
}
this._connection = false;
this._connected = false;
this.messages = 0;
this.available = true;
}
/**
* Initiates a connection to the SMTP server
*
* @param {Function} callback Callback function to run once the connection is established or failed
*/
connect(callback) {
this.pool.getSocket(this.options, (err, socketOptions) => {
if (err) {
return callback(err);
}
let returned = false;
let options = this.options;
if (socketOptions && socketOptions.connection) {
this.logger.info({
tnx: 'proxy',
remoteAddress: socketOptions.connection.remoteAddress,
remotePort: socketOptions.connection.remotePort,
destHost: options.host || '',
destPort: options.port || '',
action: 'connected'
}, 'Using proxied socket from %s:%s to %s:%s', socketOptions.connection.remoteAddress, socketOptions.connection.remotePort, options.host || '', options.port || '');
options = assign(false, options);
Object.keys(socketOptions).forEach(key => {
options[key] = socketOptions[key];
});
}
this.connection = new SMTPConnection(options);
this.connection.once('error', err => {
this.emit('error', err);
if (returned) {
return;
}
returned = true;
return callback(err);
});
this.connection.once('end', () => {
this.close();
if (returned) {
return;
}
returned = true;
setTimeout(() => {
if (returned) {
return;
}
// still have not returned, this means we have an unexpected connection close
let err = new Error('Unexpected socket close');
if (this.connection && this.connection._socket && this.connection._socket.upgrading) {
// starttls connection errors
err.code = 'ETLS';
}
callback(err);
}, 1000).unref();
});
this.connection.connect(() => {
if (returned) {
return;
}
if (this.auth) {
this.connection.login(this.auth, err => {
if (returned) {
return;
}
returned = true;
if (err) {
this.connection.close();
this.emit('error', err);
return callback(err);
}
this._connected = true;
callback(null, true);
});
} else {
returned = true;
this._connected = true;
return callback(null, true);
}
});
});
}
/**
* Sends an e-mail to be sent using the selected settings
*
* @param {Object} mail Mail object
* @param {Function} callback Callback function
*/
send(mail, callback) {
if (!this._connected) {
return this.connect(err => {
if (err) {
return callback(err);
}
return this.send(mail, callback);
});
}
let envelope = mail.message.getEnvelope();
let messageId = mail.message.messageId();
let recipients = [].concat(envelope.to || []);
if (recipients.length > 3) {
recipients.push('...and ' + recipients.splice(2).length + ' more');
}
this.logger.info({
tnx: 'send',
messageId,
cid: this.id
}, 'Sending message %s using #%s to <%s>', messageId, this.id, recipients.join(', '));
if (mail.data.dsn) {
envelope.dsn = mail.data.dsn;
}
this.connection.send(envelope, mail.message.createReadStream(), (err, info) => {
this.messages++;
if (err) {
this.connection.close();
this.emit('error', err);
return callback(err);
}
info.envelope = {
from: envelope.from,
to: envelope.to
};
info.messageId = messageId;
setImmediate(() => {
let err;
if (this.messages >= this.options.maxMessages) {
err = new Error('Resource exhausted');
err.code = 'EMAXLIMIT';
this.connection.close();
this.emit('error', err);
} else {
this.pool._checkRateLimit(() => {
this.available = true;
this.emit('available');
});
}
});
callback(null, info);
});
}
/**
* Closes the connection
*/
close() {
this._connected = false;
if (this.auth && this.auth.oauth2) {
this.auth.oauth2.removeAllListeners();
}
if (this.connection) {
this.connection.close();
}
this.emit('close');
}
}
module.exports = PoolResource;
|