#!/bin/sh
# Script to create a CATALINA_BASE directory for your own tomcat

PROG=`basename $0`
TARGET=""
HPORT=8080
CPORT=8005
CWORD="SHUTDOWN"
warned=0
warnlowport=0

usage() {
  echo "Usage: $PROG [options] <directoryname>"
  echo "  directoryname: name of the tomcat instance directory to create"
  echo "Options:"
  echo "  -h, --help       Display this help message"
  echo "  -p httpport      HTTP port to be used by Tomcat (default is $HPORT)"
  echo "  -c controlport   Server shutdown control port (default is $CPORT)"
  echo "  -w magicword     Word to send to trigger shutdown (default is $CWORD)"
}

checkport() {
  type=$1
  port=$2
  # Fail if port is non-numeric
  num=`expr ${port} + 1 2> /dev/null`
  if [ $? != 0 ] || [ $num -lt 2 ]; then
    echo "Error: ${type} port '${port}' is not a valid TCP port number."
    exit 1
  fi

  # Fail if port is above 65535
  if [ ${port} -gt 65535 ]; then
    echo "Error: ${type} port ${port} is above TCP port numbers (> 65535)."
    exit 1
  fi

  # Warn if port is below 1024 (once)
  if [ ${warnlowport} -eq 0 ]; then 
    if [ ${port} -lt 1024 ]; then
      echo "Warning: ports below 1024 are reserved to the super-user."
      warnlowport=1
      warned=1
    fi
  fi

  # Warn if port appears to be in use
  if nc localhost "${port}" -z > /dev/null; then
	echo "Warning: ${type} port ${port} appears to be in use."
	warned=1
  fi
}

if [ "$#" -lt 1 ]; then
  usage
  exit 1
fi
if [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
  usage
  exit 0
fi



while getopts ":p:c:w:h" options; do
  case $options in
    p ) HPORT=$OPTARG ;;
    c ) CPORT=$OPTARG ;;
    w ) CWORD=$OPTARG ;;
    h ) usage;;
    * ) echo "Error: Unknown parameter '$OPTARG'."
        exit 1;;
  esac
done

shift $(($OPTIND - 1))
TARGET=$1
shift
echo "You are about to create a Tomcat instance in directory '$TARGET'"

# Fail if no target specified
if [ -z "${TARGET}" ]; then
  echo "Error: No target directory specified (use -d)."
  exit 1
fi

# Fail if ports are the same
if [ "${HPORT}" = "${CPORT}" ]; then
  echo "Error: HTTP port and control port must be different."
  exit 1
fi

# Fail if target directory already exists
if [ -d "${TARGET}" ]; then
  echo "Error: Target directory already exists."
  exit 1
fi

# Check ports
checkport HTTP "${HPORT}"
checkport Control "${CPORT}"

# Ask for confirmation if warnings were printed out
if [ ${warned} -eq 1 ]; then 
  echo "Type <ENTER> to continue, <CTRL-C> to abort."
  read answer
fi

mkdir -p "${TARGET}"

FULLTARGET=`cd "${TARGET}" > /dev/null && pwd`

mkdir "${TARGET}/conf"
mkdir "${TARGET}/logs"
mkdir "${TARGET}/webapps"
mkdir "${TARGET}/work"
mkdir "${TARGET}/temp"
cp -r /usr/share/tomcat9/skel/* "${TARGET}"

sed -i -e "s/Connector port=\"8080\"/Connector port=\"${HPORT}\"/;s/Server port=\"-1\" shutdown=\"SHUTDOWN\"/Server port=\"${CPORT}\" shutdown=\"${CWORD}\"/" "${TARGET}/conf/server.xml"

cat > "${TARGET}/bin/startup.sh" << EOT
#!/bin/sh
export CATALINA_BASE="${FULLTARGET}"
/usr/share/tomcat9/bin/startup.sh
echo "Tomcat started"
EOT

cat > "${TARGET}/bin/shutdown.sh" << EOT
#!/bin/sh
export CATALINA_BASE="${FULLTARGET}"
/usr/share/tomcat9/bin/shutdown.sh
echo "Tomcat stopped"
EOT

chmod a+x "${TARGET}/bin/startup.sh" "${TARGET}/bin/shutdown.sh"
echo "* New Tomcat instance created in ${TARGET}"
echo "* You might want to edit default configuration in ${TARGET}/conf"
echo "* Run ${TARGET}/bin/startup.sh to start your Tomcat instance"