#! /bin/bash

install_dir='/opt/yubilock/'
logging_dir='/var/log/yubilock/'

script_dir="$(dirname $(readlink -f $0))"
# exit when any command fails
set -e

# Make sure running as root
if [ `id -u` -ne 0 ]; then
   echo 'Please run as root'
   exit 1
fi

# Ask for user parameters
echo "This installer is meant to install the yubilock service for one user. Please specifiy for wich user you want to install xscreensaver-yubilock"
read -p 'Username: ' username
userid=`id -u "$username" 2>/dev/null` || ( echo "$username is not a user on this system" && exit 1 )
[ "$userid" -lt 1000 ] && echo "User $username seems to be a systemuser (uid: $userid). Please specify a normal user." && exit 1 

echo "Allowed yubikey serials can be set in {$install_dir}config.ini. Do you wish to add one or more automaticaly now?"
read -p "Add Yubikey serial? (Y/n) " add_serial
[ -z "$add_serial" ] && add_serial='yes' # if no input, assume yes
case ${add_serial:0:1} in
   y|Y|1 )
      add_serial='yes';;
   * )
      add_serial='no';;
esac
if [ "$add_serial" = 'yes' ]; then
   if  ! ykman -v >/dev/null 2>&1 ; then
      echo "yubikey-manager doesn't seem to be installed. Do you want to install it? ('no' means you'll have to add your yubikey serial manually later"
      read -p "Install yubikey-manager? (Y/n) " install_ykman
      [ -z "$install_ykman" ] && install_ykman='yes' # if no input, assume yes
      case ${install_ykman:0:1} in
         y|Y|1 )
            apt-get install -y yubikey-manager;;
         * )
            break 3;;
      esac
   fi
   echo "Please make sure your yubikey(s) are plugged in. Then press any key to continue"
   read -n 1 -s -r
   serials=`ykman list | sed -e 's#.*:\ \(\)#\1#' | tr '\n' ','` # List all keys, get the serials, and comma separate them
   serials="${serials%?}" # Remove trailing comma
   echo "The following serial(s) will be added to your config file: $serials"
fi



echo "Do you want the daemon to be started by systemd? (you'll have to start it manually every login session if you choose no)"
read -p "Use Systemd? (Y/n) " use_systemd
[ -z "$use_systemd" ] && use_systemd='yes' # if no input, assume yes
case ${use_systemd:0:1} in
   y|Y|1 )
      use_systemd='yes';;
   * )
      use_systemd='no';;
esac



echo "Create yubilock user"
adduser --system --home "$install_dir" --shell "/usr/sbin/nologin" --group --gecos "xscreensaver yubilock daemon" -q 'yubilock' 


echo "Making sure python3 and virtualenv are installed"
python3 --version || apt-get install -y python3
python3 -m venv -h >/dev/null 2>&1 || apt-get install -y python3-venv


echo "Create virualenv"
[ -f "$install_dir/venv/bin/activate" ] || python3 -m venv "$install_dir/venv"
. "$install_dir/venv/bin/activate"
pip install setuptools wheel
pip install -r "$script_dir/requirements.txt"


echo "Copy over application files"
cp "$script_dir/xscreensaver_yubilock.py" "$install_dir"
cp "$script_dir/uninstall.sh" "$install_dir"
cp "$script_dir/config_example.ini" "$install_dir/config.ini"

# Remove first line from config
sed -i '1d' "$install_dir/config.ini"

# Add yubikey serials to config
[ -n "$serials" ] && sed -i "s+^yubikey_serial\ =.*+yubikey_serial\ =\ $serials+g" "$install_dir/config.ini"

chown -R yubilock:yubilock "$install_dir"
chown root:yubilock "$install_dir"
chmod 775 "$install_dir"


echo "Create logging directory"
mkdir -p "$logging_dir"
chown --from=root:root root:yubilock "$logging_dir"
chmod 775 "$logging_dir"
sed -i "s+^logfile\ =.*+logfile\ =\ ${logging_dir}daemon.log+g" "$install_dir/config.ini"


echo "Allow yubilock user access to X host"
touch "$install_dir/.Xauthority"
chown yubilock:yubilock "$install_dir/.Xauthority"
hexkey=`sudo -u $username xauth list | cut -d ' ' -f 5`
export XAUTHORITY="/opt/yubilock/.Xauthority"
echo sudo -u yubilock xauth add \":0\" . "$hexkey"
sudo -u yubilock xauth add ":0" . "$hexkey"


echo "Fix udev usb rights for yubilock"
cp "$script_dir/debian/91-usbftdi.rules" '/etc/udev/rules.d/'
chown root:root '/etc/udev/rules.d/91-usbftdi.rules'
udevadm control --reload-rules


if [ "$use_systemd" = 'yes' ]; then
   echo "Enable as systemd service"
   cp "$script_dir/debian/yubilock.service" "/etc/systemd/system"
   sed -i "s+^ExecStart=.*+ExecStart=${install_dir}venv/bin/python ${install_dir}xscreensaver_yubilock.py+g" '/etc/systemd/system/yubilock.service'
   systemctl enable yubilock.service
else
   # Make sure service is not previously installed
   systemctl stop yubilock.service >/dev/null 2>&1
   systemctl disable yubilock.service >/dev/null 2>&1
   rm '/etc/systemd/system/yubilock.service' >/dev/null 2>&1
   rm '/usr/lib/systemd/system/yubilock.service' >/dev/null 2>&1
   systemctl daemon-reload
   systemctl reset-failed
fi

echo "xscreensaver-yubilock is installed!"

if [ "$use_systemd" = 'yes' ]; then
   echo "Do you wish to start the daemon now? WARNING: If the specified yubikey is not plugged in, your machine will lock. Alternatively, you can start the service using 'sudo systemctl start yubilock.service' or wait for next login."
   read -p "Start daemon? (y/N) " start_daemon
   [ -z "$start_daemon" ] && start_daemon='no' # if no input, assume no
   case ${start_daemon:0:1} in
      n|N|0 )
         ;;
      * )
         systemctl start yubilock.service;;
   esac
fi

exit 0
#(Uninstall script)