FreeBSD/Truenas Core Bash script to automatically map transmission peer port with PrivateInternetAccess

map_port.sh

#!/usr/bin/env bash

# These three environment variables should be set, or you can hardcode them into this script
PIA_USER=$PIA_USER
PIA_PASS=$PIA_PASS
TRANSMISSION_HOST=$TRANSMISSION_HOST

generateTokenResponse=$(curl -s --location --request POST \
  'https://www.privateinternetaccess.com/api/client/v2/token' \
  --form "username=$PIA_USER" \
  --form "password=$PIA_PASS" )

token=$(echo "$generateTokenResponse" | jq -r '.token')
gateway=$(netstat -rn | grep -oE "0.0.0.0\/1(.+)10\.[0-9]+\.[0-9]+\.[0-9]+" | tr -d "a-z :" | sed -n "s/0.0.0.0\/1//p")

readarray -t payload_arr < <(curl -ks "https://$gateway:19999/getSignature?token=$token" | jq -r .payload,.signature)

payload="${payload_arr[0]}"
token="${payload_arr[1]}"
port=$(echo "$payload" | base64 -d | jq -r .port)

while true; do
  #PIA will automatically drop the port mapping without a keep-alive. This will request the same port every 15 minutes
  output=$(curl -sGk --data-urlencode "payload=$payload" --data-urlencode "signature=$token" https://"$gateway":19999/bindPort)

  sessionid="$(curl -is "$TRANSMISSION_HOST"/transmission/rpc | grep -oE "<code>([^<]+)</code>" | grep -oE ": [^<]+" |  awk -F': ' '{print $2}' | awk -F'</code>' '{print $1}')"

  set_port=$(curl -sX POST "$TRANSMISSION_HOST"/transmission/rpc/ -H "Content-Type: application/json" -H "X-Transmission-Session-Id: $sessionid" -d "{\"method\": \"session-set\",\"arguments\": {\"peer-port\": $port}}")

  echo $set_port

  sleep 900

done