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
|
package slack
import (
"regexp"
"strings"
)
// Constants for Slack API limits.
const (
MaxAttachments = 100 // Maximum number of attachments allowed by Slack API
)
var iconURLPattern = regexp.MustCompile(`https?://`)
// MessagePayload used within the Slack service.
type MessagePayload struct {
Text string `json:"text"`
BotName string `json:"username,omitempty"`
Blocks []block `json:"blocks,omitempty"`
Attachments []attachment `json:"attachments,omitempty"`
ThreadTS string `json:"thread_ts,omitempty"`
Channel string `json:"channel,omitempty"`
IconEmoji string `json:"icon_emoji,omitempty"`
IconURL string `json:"icon_url,omitempty"`
}
type block struct {
Type string `json:"type"`
Text blockText `json:"text"`
}
type blockText struct {
Type string `json:"type"`
Text string `json:"text"`
}
type attachment struct {
Title string `json:"title,omitempty"`
Fallback string `json:"fallback,omitempty"`
Text string `json:"text"`
Color string `json:"color,omitempty"`
Fields []legacyField `json:"fields,omitempty"`
Footer string `json:"footer,omitempty"`
Time int `json:"ts,omitempty"`
}
type legacyField struct {
Title string `json:"title"`
Value string `json:"value"`
Short bool `json:"short,omitempty"`
}
// APIResponse is the default generic response message sent from the API.
type APIResponse struct {
Ok bool `json:"ok"`
Error string `json:"error"`
Warning string `json:"warning"`
MetaData struct {
Warnings []string `json:"warnings"`
} `json:"response_metadata"`
}
// CreateJSONPayload compatible with the slack post message API.
func CreateJSONPayload(config *Config, message string) any {
lines := strings.Split(message, "\n")
// Pre-allocate atts with a capacity of min(len(lines), MaxAttachments)
atts := make([]attachment, 0, minInt(len(lines), MaxAttachments))
for i, line := range lines {
// When MaxAttachments have been reached, append the remaining lines to the last attachment
if i >= MaxAttachments {
atts[MaxAttachments-1].Text += "\n" + line
continue
}
atts = append(atts, attachment{
Text: line,
Color: config.Color,
})
}
// Remove last attachment if empty
if len(atts) > 0 && atts[len(atts)-1].Text == "" {
atts = atts[:len(atts)-1]
}
payload := MessagePayload{
ThreadTS: config.ThreadTS,
Text: config.Title,
BotName: config.BotName,
Attachments: atts,
}
payload.SetIcon(config.Icon)
if config.Channel != "webhook" {
payload.Channel = config.Channel
}
return payload
}
// SetIcon sets the appropriate icon field in the payload based on whether the input is a URL or not.
func (p *MessagePayload) SetIcon(icon string) {
p.IconURL = ""
p.IconEmoji = ""
if icon != "" {
if iconURLPattern.MatchString(icon) {
p.IconURL = icon
} else {
p.IconEmoji = icon
}
}
}
// minInt returns the smaller of two integers.
func minInt(a, b int) int {
if a < b {
return a
}
return b
}
|
