#!/bin/bash
#
# Copyright 2012-2014 Red Hat, Inc.
#
# This file is part of Thermostat.
#
# Thermostat is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published
# by the Free Software Foundation; either version 2, or (at your
# option) any later version.
#
# Thermostat is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Thermostat; see the file COPYING.  If not see
# <http://www.gnu.org/licenses/>.
#
# Linking this code with other modules is making a combined work
# based on this code.  Thus, the terms and conditions of the GNU
# General Public License cover the whole combination.
#
# As a special exception, the copyright holders of this code give
# you permission to link this code with independent modules to
# produce an executable, regardless of the license terms of these
# independent modules, and to copy and distribute the resulting
# executable under terms of your choice, provided that you also
# meet, for each linked independent module, the terms and conditions
# of the license of that module.  An independent module is a module
# which is not derived from or based on this code.  If you modify
# this code, you may extend this exception to your version of the
# library, but you are not obligated to do so.  If you do not wish
# to do so, delete this exception statement from your version.
#
#####################################################################
#
read -d '' help_text <<"END_OF_HELP"
thermostat-webservice: A convenience script for starting and stopping
tomcat with thermostat web storage application deployed.

This script is intended to be an aid for developers to start up
tomcat and deploy thermostat web storage app.  It is assumed that
there is already a backing storage running that the web app can
connect to, and that the web.xml file from the build image is
correctly configured for this backing storage connection.  See
the file:

   web/war/target/thermostat-web-war-0.16.0-SNAPSHOT/WEB-INF/web.xml

In addition, an appropriate user and role configuration must be
present in the build image.  See the files:

   distribution/target/image/etc/thermostat-users.properties
   distribution/target/image/etc/thermostat-roles.properties

An agent requires authentication configuration in order to connect
to secured storage.  See the file:

   ~/.thermostat/etc/agent.auth

Possible contents of thermostat-users.properties:

   agent-tester=tester
   client-tester=tester

Corresponding potential thermostat-roles.properties:

   agent-tester=thermostat-agent, thermostat-files-grant-write-filename-ALL
   client-tester=thermostat-client, thermostat-cmdc-allPrivs, \\
                 thermostat-files-grant-read-filename-ALL
   thermostat-agent=thermostat-write, thermostat-prepare-statement, \\
                    thermostat-save-file, thermostat-purge, \\
                    thermostat-register-category, thermostat-cmdc-verify, \\
                    thermostat-login, thermostat-realm
   thermostat-client=thermostat-agents-grant-read-agentId-ALL, \\
                     thermostat-hosts-grant-read-hostname-ALL, \\
                     thermostat-vms-grant-read-vmId-ALL, \\
                     thermostat-vms-grant-read-username-ALL, thermostat-realm, \\
                     thermostat-login, thermostat-query, \\
                     thermostat-prepare-statement, thermostat-cmdc-generate, \\
                     thermostat-load-file, thermostat-get-count, \\
                     thermostat-register-category
   thermostat-cmdc-allPrivs = thermostat-cmdc-grant-garbage-collect, \\
                     thermostat-cmdc-grant-dump-heap, \\
                     thermostat-cmdc-grant-thread-harvester, \\
                     thermostat-cmdc-grant-killvm, \\
                     thermostat-cmdc-grant-ping, \\
                     thermostat-cmdc-grant-jmx-toggle-notifications

Please be familiar with these privileges to decide whether this
set of users and roles is appropriate for you or your testing.

Contents of ~/.thermostat/etc/agent.auth that would be valid with the above:

   username=agent-tester
   password=tester

Here is typical use of this script:

   $ echo ${USER_FLUFF} > distribution/target/image/etc/thermostat-users.properties
   $ echo ${ROLE_FLUFF} > distribution/target/image/etc/thermostat-roles.properties
   $ echo ${AGENT_FLUFF} > ~/.thermostat/etc/agent.auth
   $ ./distribution/target/image/bin/thermostat storage --start
   $ ./distribution/target/image/bin/thermostat-webservice -t /path/to/tomcat start
   $ ./distribution/target/image/bin/thermostat agent -d http://127.0.0.1:8080/thermostat/storage
   $ ./distribution/target/image/bin/thermostat gui

   ... and so forth.

   ./distribution/target/image/bin/thermostat-webservice -t /path/to/tomcat stop
   ./distribution/target/image/bin/thermostat storage --stop

NOTE: Use of this script to start tomcat will blow away webapps/thermostat
in your tomcat directory and replace it with the corresponding contents
from your build image.

NOTE2: If tomcat is already running, results of this script are undefined.

.
END_OF_HELP
#

TOMCAT_DIR=tomcat

usage() {
  echo "Usage: "
  echo "   thermostat-webservice [-t <root of tomcat directory>] <start|stop>"
}

do_help() {
  echo "$help_text"
  usage
}

check_valid_args() {
  if [ "x${FUNCTION}" = "x" ] ; then
    echo "You must specify either start, stop, or help."
    usage
    exit 1
  fi
  if [ ! -d ${TOMCAT_DIR} ] ; then
    echo "Tomcat directory does not exist: ${TOMCAT_DIR}"
    usage
    exit 1
  fi
}

process_args() {
  while [ $# -gt 0 ]; do
    THIS_ARG=$1
    shift
    if [ $THIS_ARG = "-h" -o $THIS_ARG = "--help" -o $THIS_ARG = "help" ] ; then
      do_help
      exit
      break
    elif [ $THIS_ARG = "-t" ] ; then
      TOMCAT_DIR=$1
      shift
    elif [ $THIS_ARG = "start" -o $THIS_ARG = "stop" ] ; then
      FUNCTION=$THIS_ARG
    else
      echo "Unrecognized argument: $THIS_ARG"
      exit 1
    fi
  done
  check_valid_args
}

do_start() {
  rm -rf webapps/thermostat
  cp -r "$TH/web/war/target/thermostat-web-war-@project.version@" webapps/thermostat
  JAVA_OPTS="-Djava.security.auth.login.config=${TH}/distribution/target/image/etc/thermostat_jaas.conf" ./bin/startup.sh
}

do_stop() {
  ./bin/shutdown.sh
}

do_function() {
  TH="$(pwd)"
  cd ${TOMCAT_DIR}
  case $1 in
    start )
      do_start
      ;;
    stop )
      do_stop
      ;;
  esac
  cd ${TH}
}

process_args $*
do_function $FUNCTION

# Please be familiar with these privileges to decide whether this
# set of users and roles is appropriate for you or your testing.
#
#TH="$(pwd)"
#cd path/to/tomcat
#rm -rf webapps/thermostat
#cp -r $TH/web/war/target/thermostat-web-war-0.16.0-SNAPSHOT webapps/thermostat
#export JAVA_OPTS="-Djava.security.auth.login.config=${TH}/distribution/target/image/etc/thermostat_jaas.conf"
#./bin/startup.sh
#cd $TH
#./distribution/target/image/bin/thermostat storage --start
#mkdir -p ~/.thermostat/etc
#echo -e "username=agent-tester\npassword=tester" > ~/.thermostat/etc/agent.auth
#./distribution/target/image/bin/thermostat agent -d http://127.0.0.1:8080/thermostat/storage