125 lines
3 KiB
Go
125 lines
3 KiB
Go
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
|
|
}
|