Adding upstream version 0.8.9.

Signed-off-by: Daniel Baumann <daniel@debian.org>

pkg/services/slack/slack_json.go

@@ -0,0 +1,125 @@
+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
+}