From bc920949cba1eb73cbb2f5fd38e2d489096e054d Mon Sep 17 00:00:00 2001
From: Grigory Starinkin <grigory@gameanalytics.com>
Date: Mon, 18 Jul 2022 10:50:50 +0100
Subject: [PATCH] Add Slack App notification hook

Slack Incoming webhooks is a legacy custom integration - an outdated
way for teams to integrate with Slack. These integrations lack newer
features and they will be deprecated and possibly removed in the
future. Slack team do not recommend their use. Instead, it's suggested
to use Slack apps.
---
 notify/slack_app.sh | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100755 notify/slack_app.sh

diff --git a/notify/slack_app.sh b/notify/slack_app.sh
new file mode 100755
index 00000000..5b012a41
--- /dev/null
+++ b/notify/slack_app.sh
@@ -0,0 +1,44 @@
+#!/usr/bin/env sh
+
+#Support Slack APP notifications
+
+#SLACK_APP_CHANNEL=""
+#SLACK_APP_TOKEN=""
+
+slack_app_send() {
+  _subject="$1"
+  _content="$2"
+  _statusCode="$3" #0: success, 1: error 2($RENEW_SKIP): skipped
+  _debug "_statusCode" "$_statusCode"
+
+  SLACK_APP_CHANNEL="${SLACK_APP_CHANNEL:-$(_readaccountconf_mutable SLACK_APP_CHANNEL)}"
+  if [ -n "$SLACK_APP_CHANNEL" ]; then
+    _saveaccountconf_mutable SLACK_APP_CHANNEL "$SLACK_APP_CHANNEL"
+  fi
+
+  SLACK_APP_TOKEN="${SLACK_APP_TOKEN:-$(_readaccountconf_mutable SLACK_APP_TOKEN)}"
+  if [ -n "$SLACK_APP_TOKEN" ]; then
+    _saveaccountconf_mutable SLACK_APP_TOKEN "$SLACK_APP_TOKEN"
+  fi
+
+  _content="$(printf "*%s*\n%s" "$_subject" "$_content" | _json_encode)"
+  _data="{\"text\": \"$_content\", "
+  if [ -n "$SLACK_APP_CHANNEL" ]; then
+    _data="$_data\"channel\": \"$SLACK_APP_CHANNEL\", "
+  fi
+  _data="$_data\"mrkdwn\": \"true\"}"
+
+  export _H1="Authorization: Bearer $SLACK_APP_TOKEN"
+
+  SLACK_APP_API_URL="https://slack.com/api/chat.postMessage"
+  if _post "$_data" "$SLACK_APP_API_URL" "" "POST" "application/json; charset=utf-8"; then
+    SLACK_APP_RESULT_OK=$(echo "$response" | _egrep_o 'ok" *: *true')
+    if [ "$?" = "0" ] && [ "$SLACK_APP_RESULT_OK" ]; then
+      _info "slack send success."
+      return 0
+    fi
+  fi
+  _err "slack send error."
+  _err "$response"
+  return 1
+}