Setting ngrok domain to facebook webhook messenger

initWebhook.sh

#!/bin/bash

# Setup:
# 1. sudo apt-get install jq
# 2. https://ngrok.com/download
# 3. sudo chmod a+x path/to/initWebhook.sh

# RUN: ./initWebhook.sh http domain.com 80

PROTO=${1:-http}

DOMAIN=${2-localhost}

PORT=${3-80}

ngrokCLI="./ngrok ${PROTO} -host-header=${DOMAIN} ${PORT}"

pidNgrok=$(ps -aux | grep "$ngrokCLI" | grep -v 'grep' | awk '{print $2}')

if [[  ! -z $pidNgrok  ]]
then
  kill -9 $pidNgrok
fi

$ngrokCLI > /dev/null &

count=0;

while [[  -z "$host" || "$host" == 'null' ]]; do
    host=$(curl -s http://localhost:4040/api/tunnels/command_line | jq -r --unbuffered '.public_url')

    sleep 1
    count=$((count+1))

    if [ $count == 10 ]; then break; fi
done

callbackURL="${host}/api/facebook/webhook"

bodySubscription='{"object": "page", "callback_url": "'"$callbackURL"'", "fields": "feed,message_echoes,messaging_postbacks,message_reads,messaging_referrals,messaging_optins,messages,message_reactions", "verify_token": "xxx"}'

curl "https://graph.facebook.com/pageId/subscriptions?access_token=xxx" \
-H 'Content-Type: application/json' \
-X POST \
-d "$bodySubscription"