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#!/usr/bin/env sh

CACHE="${XDG_CACHE_HOME:-${HOME}/.cache}/nordconnect"
CONFIG="${XDG_CONFIG_HOME:-${HOME}/.config}/nordconnect"
CREDENTIALS="${CONFIG}/credentials"
FILES_FOLDER="${CONFIG}/files"
ZIP_FILE="${CACHE}/ovpn.zip"

die() {
  echo "$@" >&2; exit 1
}

connect() {
  PORT="$1"
  SERVER="$2"

  [ -f "$CREDENTIALS" ] || die "Please run ${0} --init before connecting for the first time."

  [ -d "$FILES_FOLDER" ] || mkdir -p "$FILES_FOLDER"
  CONFIG_FILE="ovpn_${PORT}/${SERVER}.nordvpn.com.${PORT}.ovpn"

  [ -f "${FILES_FOLDER}/${CONFIG_FILE}" ] || {
    unzip -t "$ZIP_FILE" "$CONFIG_FILE" >/dev/null || update
    unzip -oqu "$ZIP_FILE" "$CONFIG_FILE" -d "$FILES_FOLDER" || die "Server ${SERVER} on port ${PORT} not found."
  }

  echo "Connecting to server ${SERVER} on port ${PORT}"

  LOGS_FOLDER="${CONFIG}/logs"
  [ -d "$LOGS_FOLDER" ] || mkdir -p "$LOGS_FOLDER"
  touch "${LOGS_FOLDER}/openvpn.log" "${LOGS_FOLDER}/status.log"

  set -- \
    --redirect-gateway \
    --auth-retry nointeract \
    --config "${FILES_FOLDER}/${CONFIG_FILE}" \
    --auth-user-pass "$CREDENTIALS" \
    --log "${LOGS_FOLDER}/openvpn.log" \
    --status "${LOGS_FOLDER}/status.log" \
    --syslog "$0"

  UPDATE_SYSTEMD_RESOLVED=/etc/openvpn/scripts/update-systemd-resolved
  [ -f "$UPDATE_SYSTEMD_RESOLVED" ] && {
    set -- "$@" \
    --dhcp-option DOMAIN-ROUTE . \
    --script-security 2 \
    --setenv PATH '/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin' \
    --up "$UPDATE_SYSTEMD_RESOLVED" \
    --down "$UPDATE_SYSTEMD_RESOLVED" \
    --down-pre
  }

  echo "Check log files at $LOGS_FOLDER if errors occur."
  unset CONFIG_FILE LOGS_FOLDER PORT SERVER UPDATE_SYSTEMD_RESOLVED
  exec sudo openvpn "${@}"
}

init() {
  [ -d "$CONFIG" ] || mkdir -p "$CONFIG"

  printf 'Enter your username for NordVPN, i.e. youremail@yourmail.com: '; read -r USERNAME
  stty -echo 2>/dev/null
  printf 'Enter the password for NordVPN: '; read -r PASSWORD
  stty echo 2>/dev/null

  printf '%s\n%s' "$USERNAME" "$PASSWORD" > "$CREDENTIALS"
  unset USERNAME PASSWORD
  chmod 600 "$CREDENTIALS"
}

update() {
  [ -d "$CACHE" ] || mkdir -p "$CACHE"
  rm -- "$ZIP_FILE"

  # shamelessly stolen from winetricks
  case "$NORDCONNECT_DOWNLOADER" in
    aria2c|curl|wget|fetch) DOWNLOADER="$NORDCONNECT_DOWNLOADER";;
    '')
      if [ -x "$(command -v aria2c 2>/dev/null)" ]; then
        DOWNLOADER=aria2c
      elif [ -x "$(command -v wget 2>/dev/null)" ]; then
        DOWNLOADER=wget
      elif [ -x "$(command -v curl 2>/dev/null)" ]; then
        DOWNLOADER=curl
      elif [ -x "$(command -v fetch 2>/dev/null)" ]; then
        DOWNLOADER=fetch
      else
        die 'Please install aria2c, wget, curl or fetch'
      fi;;
    *) die "Invalid value ${NORDCONNECT_DOWNLOADER} given for NORDCONNECT_DOWNLOADER. Possible values: aria2c, curl, wget, fetch."
  esac

  # Common values for aria2c/curl/fetch/wget
  # Number of retry attempts (not supported by fetch):
  DOWNLOADER_RETRIES=${NORDCONNECT_DOWNLOADER_RETRIES:-3}
  # Connection timeout time (in seconds):
  DOWNLOADER_TIMEOUT=${NORDCONNECT_DOWNLOADER_TIMEOUT:-15}

  URL='https://downloads.nordcdn.com/configs/archives/servers/ovpn.zip'

  echo "Downloading ${URL}"
  case "$DOWNLOADER" in
    aria2c)
      aria2c \
        --connect-timeout="$DOWNLOADER_TIMEOUT" \
        --continue \
        --daemon=false \
        --dir="$(dirname "$ZIP_FILE")" \
        --enable-rpc=false \
        --input-file='' \
        --max-connection-per-server=5 \
        --max-tries="$DOWNLOADER_RETRIES" \
        --out="$(basename "$ZIP_FILE")" \
        --save-session='' \
        --stream-piece-selector=geom \
        "$URL";;
    wget)
      wget \
        -O "$ZIP_FILE" \
        -nd \
        -c \
        --read-timeout 300 \
        --retry-connrefused \
        --timeout "$DOWNLOADER_TIMEOUT" \
        --tries "$DOWNLOADER_RETRIES" \
        "$URL";;
    curl)
      curl \
        --connect-timeout "$DOWNLOADER_TIMEOUT" \
        -L \
        -o "$ZIP_FILE" \
        -C - \
        --retry "$DOWNLOADER_RETRIES" \
        "$URL";;
    fetch)
      fetch \
        -T "$DOWNLOADER_TIMEOUT" \
        -o "$ZIP_FILE" \
        "$URL";;
    *) die 'Here be dragons';;
  esac || die "Could not download $URL!"

  find "$FILES_FOLDER" -name "*.ovpn" -delete

  unset DOWNLOADER DOWNLOADER_RETRIES DOWNLOADER_TIMEOUT URL
}

usage() {
  echo "\
usage: ${0} [-h] [--init | --update | server]

positonal arguments:
  server

optional arguments:
  -h --help    show this help message and exit
  -i --init    initialise and store/change credentials
  -u --update  download/update VPN config files
"
}

TEMP=$(getopt -s 'sh' -o 'hiu' -l 'help,init,tcp,udp,update' -n "$0" -- "$@")
eval set -- "$TEMP"

while true; do
  case "$1" in
    -h|--help) ACTION=usage;;
    -i|--init) ACTION=${ACTION:-init};;
    -u|--update) ACTION=${ACTION:-update};;

    --tcp) PORT=tcp;;
    --udp) PORT=udp;;

    --) shift; break;;
  esac; shift
done

[ -z "$ACTION" ] && [ -n "$1" ] && {
  ACTION=connect
  SERVER="$1"
}

case "${ACTION:-usage}" in
  usage) usage;;
  init) init;;
  update) update;;
  connect) connect "${PORT:-udp}" "$SERVER";;
  *) usage;;
esac

unset ACTION CACHE CONFIG CREDENTIALS FILES_FOLDER PORT SERVER TEMP

# vim:set ts=2 sw=2 et: