Slack notification block not working (#1958)

* [empty commit] pull request for slack notification

* Add attachments block for slack notification

* chore: update action button in new attachment block

* chore: loop in attachments to push blocks

* chore: missing semicolon

Co-authored-by: pruekanw <arniwatt.c@linecorp.com>

server/notification-providers/slack.js

@@ -1,7 +1,7 @@
 const NotificationProvider = require("./notification-provider");
 const axios = require("axios");
 const { setSettings, setting } = require("../util-server");
-const { getMonitorRelativeURL } = require("../../src/util");
+const { getMonitorRelativeURL, UP } = require("../../src/util");
 
 class Slack extends NotificationProvider {
 
@@ -46,7 +46,11 @@ class Slack extends NotificationProvider {
                 "channel": notification.slackchannel,
                 "username": notification.slackusername,
                 "icon_emoji": notification.slackiconemo,
-                "blocks": [{
+                "attachments": [
+                    {
+                        "color": (heartbeatJSON["status"] === UP) ? "#2eb886" : "#e01e5a",
+                        "blocks": [
+                            {
                                 "type": "header",
                                 "text": {
                                     "type": "plain_text",
@@ -63,7 +67,10 @@ class Slack extends NotificationProvider {
                                     "type": "mrkdwn",
                                     "text": "*Time (UTC)*\n" + time,
                                 }],
-                }],
+                            }
+                        ],
+                    }
+                ]
             };
 
             if (notification.slackbutton) {
@@ -74,7 +81,8 @@ class Slack extends NotificationProvider {
 
             // Button
             if (baseURL) {
-                data.blocks.push({
+                data.attachments.forEach(element => {
+                    element.blocks.push({
                         "type": "actions",
                         "elements": [{
                             "type": "button",
@@ -86,6 +94,7 @@ class Slack extends NotificationProvider {
                             "url": baseURL + getMonitorRelativeURL(monitorJSON.id),
                         }],
                     });
+                });
             }
 
             await axios.post(notification.slackwebhookURL, data);