diun/internal/notif/slack/slack.go

package slack

import (
	"bytes"
	"encoding/json"
	"fmt"
	"strconv"
	"text/template"
	"time"

	"github.com/crazy-max/diun/v3/internal/model"
	"github.com/crazy-max/diun/v3/internal/notif/notifier"
	"github.com/nlopes/slack"
)

// Client represents an active slack notification object
type Client struct {
	*notifier.Notifier
	cfg *model.NotifSlack
	app model.App
}

// New creates a new slack notification instance
func New(config *model.NotifSlack, app model.App) notifier.Notifier {
	return notifier.Notifier{
		Handler: &Client{
			cfg: config,
			app: app,
		},
	}
}

// Name returns notifier's name
func (c *Client) Name() string {
	return "slack"
}

// Send creates and sends a slack notification with an entry
func (c *Client) Send(entry model.NotifEntry) error {
	var textBuf bytes.Buffer
	textTpl := template.Must(template.New("text").Parse("<!channel> Docker tag `{{ .Image.Domain }}/{{ .Image.Path }}:{{ .Image.Tag }}` {{ if (eq .Status \"new\") }}newly added{{ else }}updated{{ end }}."))
	if err := textTpl.Execute(&textBuf, entry); err != nil {
		return err
	}

	color := "#4caf50"
	if entry.Status == model.ImageStatusUpdate {
		color = "#0054ca"
	}

	return slack.PostWebhook(c.cfg.WebhookURL, &slack.WebhookMessage{
		Attachments: []slack.Attachment{
			{
				Color:         color,
				AuthorName:    "Diun",
				AuthorSubname: "github.com/crazy-max/diun",
				AuthorLink:    "https://github.com/crazy-max/diun",
				AuthorIcon:    "https://raw.githubusercontent.com/crazy-max/diun/master/.res/diun.png",
				Text:          textBuf.String(),
				Footer:        fmt.Sprintf("%s © %d %s %s", c.app.Author, time.Now().Year(), c.app.Name, c.app.Version),
				Fields: []slack.AttachmentField{
					{
						Title: "Provider",
						Value: entry.Provider,
						Short: false,
					},
					{
						Title: "Created",
						Value: entry.Manifest.Created.Format("Jan 02, 2006 15:04:05 UTC"),
						Short: false,
					},
					{
						Title: "Digest",
						Value: entry.Manifest.Digest.String(),
						Short: false,
					},
					{
						Title: "Platform",
						Value: entry.Manifest.Platform,
						Short: false,
					},
				},
				Ts: json.Number(strconv.FormatInt(time.Now().Unix(), 10)),
			},
		},
	})
}