/
mqtts.go
91 lines (79 loc) · 2.17 KB
/
mqtts.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
// Copyright 2018 SEQSENSE, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package awsiotprotocol
import (
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"io/ioutil"
"net/url"
"strconv"
mqtt "github.com/eclipse/paho.mqtt.golang"
)
// Mqtts implements Protocol interface for MQTT over TLS using x.509 certifications.
type Mqtts struct {
}
// Name returns the protocol name.
func (s Mqtts) Name() string {
return "mqtts"
}
// NewClientOptions returns MQTT connection options.
func (s Mqtts) NewClientOptions(opt *Config) (*mqtt.ClientOptions, error) {
url, err := url.Parse(opt.URL)
if err != nil {
return nil, err
}
host := url.Hostname()
if host == "" {
return nil, errors.New("Hostname is not provided in the URL")
}
var port int
if url.Port() != "" {
port, err = strconv.Atoi(url.Port())
if err != nil {
return nil, err
}
} else {
port = 8883
}
tlsconfig, err := newTLSConfig(host, opt.CaPath, opt.CertPath, opt.KeyPath)
if err != nil {
return nil, err
}
opts := mqtt.NewClientOptions()
opts.AddBroker(
fmt.Sprintf("ssl://%s:%d", host, port))
opts.SetClientID(opt.ClientID)
opts.SetTLSConfig(tlsconfig)
return opts, nil
}
func newTLSConfig(host, caFile, crtFile, keyFile string) (*tls.Config, error) {
certpool := x509.NewCertPool()
if cas, err := ioutil.ReadFile(caFile); err == nil {
certpool.AppendCertsFromPEM(cas)
}
cert, err := tls.LoadX509KeyPair(crtFile, keyFile)
if err != nil {
return nil, err
}
return &tls.Config{
RootCAs: certpool,
ClientAuth: tls.NoClientCert,
ClientCAs: nil,
InsecureSkipVerify: false,
ServerName: host,
Certificates: []tls.Certificate{cert},
}, nil
}