provider/slack: set username and imageURI

Author: adamdecaf

internal/check/checks.go

@@ -108,6 +108,8 @@ func mergeAlertConfigs(local, global config.Alert) config.Alert {
 		out.Slack = &config.Slack{
 			ApiToken:  cmp.Or(local.Slack.ApiToken, global.Slack.ApiToken),
 			ChannelID: cmp.Or(local.Slack.ChannelID, global.Slack.ChannelID),
+			Username:  cmp.Or(local.Slack.Username, global.Slack.Username),
+			ImageURI:  cmp.Or(local.Slack.ImageURI, global.Slack.ImageURI),
 		}
 	}
 

internal/config/config.go

@@ -142,16 +142,24 @@ func ReadPagerDutyFromEnv() *PagerDuty {
 type Slack struct {
 	ApiToken  string
 	ChannelID string
+
+	Username string
+	ImageURI string
 }
 
 func ReadSlackFromEnv() *Slack {
 	apiToken := os.Getenv("DEADCHECK_SLACK_API_TOKEN")
 	channelID := os.Getenv("DEADCHECK_SLACK_CHANNEL_ID")
 
+	username := os.Getenv("DEADCHECK_SLACK_USERNAME")
+	imageURI := os.Getenv("DEADCHECK_SLACK_IMAGE_URI")
+
 	if apiToken != "" && channelID != "" {
 		return &Slack{
 			ApiToken:  apiToken,
 			ChannelID: channelID,
+			Username:  username,
+			ImageURI:  imageURI,
 		}
 	}
 

internal/provider/slack/client.go

@@ -1,6 +1,7 @@
 package slack
 
 import (
+	"cmp"
 	"context"
 	"errors"
 	"fmt"
@@ -113,8 +114,12 @@ func (c *client) createSnoozedMessage(ctx context.Context, logger log.Logger, ch
 	expectedCheckin := now.Add(wait)
 	text := fmt.Sprintf("%s did not check-in, expected check-in at %v", check.ID, expectedCheckin.Format(time.RFC3339))
 	opts := []slack.MsgOption{
+		slack.MsgOptionUsername(cmp.Or(c.conf.Username, "deadcheck")),
 		slack.MsgOptionText(text, false),
 	}
+	if c.conf.ImageURI != "" {
+		opts = append(opts, slack.MsgOptionIconURL(c.conf.ImageURI))
+	}
 
 	postAt := fmt.Sprintf("%d", scheduleTime.Add(wait).Unix())
 	respChannel, scheduledMessageID, err := c.underlying.ScheduleMessageContext(ctx, c.conf.ChannelID, postAt, opts...)