#!/usr/bin/env bash

set -Eeuo pipefail

if [[ "$(hostname)" != "jeeves" ]]; then
  echo "Signal device authorization must run on jeeves." >&2
  exit 1
fi
if [[ "$EUID" -ne 0 ]]; then
  echo "Signal device authorization must run as root." >&2
  exit 1
fi
if [[ "$#" -ne 1 ]]; then
  echo "Usage: signal_authorize.sh DEVICE_URI" >&2
  exit 2
fi
if [[ "$1" != sgnl://linkdevice\?* ]]; then
  echo "Invalid Signal device link URI." >&2
  exit 2
fi

service_name="signal-cli"
data_dir="/var/lib/signal-cli"
device_uri="$1"
restart_service=false

cleanup() {
  if [[ "$restart_service" == true ]]; then
    systemctl start "$service_name"
  fi
}
trap cleanup EXIT

restart_service=true
systemctl stop "$service_name"
runuser -u signal-cli -- \
  signal-cli --data-dir "$data_dir" -a +12016554378 addDevice --uri "$device_uri"