Play a sound file when a user posts a message into a specific slack channel

monitor-for-person.sh

#!/bin/bash
###########################################################################
#
# Very very rough script! Does not work well!
#
# Will monitor a slack channel (has to be public unless you give it special
# permissions) for a specific user and if there is a message in the last 30
# seconds will play a sound file of your choosing. Obviously not great
# for conversational channels.
#
# afplay is obviously for macs, switch to your own variant.
# 
# ./monitor-for-person.sh {channel_id} {user_id}
#
###########################################################################

CHANNEL_ID=$1
NOW=$(date +%s)
POLL_HISTORY="$(($NOW-45))"
USER_ID=$2
SLACK_BEARER_TOKEN=""

while true
do
	echo "Searching for any messages since ${POLL_HISTORY} in channel ${CHANNEL_ID} for user ${USER_ID} every 30 seconds"

	HAS_MESSAGES=$(curl --silent "https://slack.com/api/conversations.history?channel=${CHANNEL_ID}&oldest=${POLL_HISTORY}" \
	-H "Authorization: Bearer ${SLACK_BEARER_TOKEN}" \
	| jq -r ".messages[] | select(.user | contains(\"${USER_ID}\"))")

	if [ -z "${HAS_MESSAGES}" ]; then
		echo "No messages found... yet..."
	else
		echo "Uh oh..."

    # A janky sound clip I made, replace with your own or do a cb function
		afplay ~/Downloads/Record\ \(online-voice-recorder.com\).mp3
	fi

	sleep 30
done