#!/bin/bash
#
# Copyright 2014 Red Hat, Inc.
#
# NAME
#     lab-webapp - setup/grading script for RH254/RH299 Apache lab
#
# SYNOPSIS
#     lab-webapp {setup|grade}
#
#     The setup function needs to be run on server
#     The grade function needs to be run on desktop
#
# DESCRIPTION
#     This script, based on singular argument, either does setup or
#     grading for the particular lab
#
# CHANGELOG
#   * Mon May 26 2014 Wander Boessenkool <wboessen@redhat.com>
#   - Initial version

PATH=/usr/bin:/bin:/usr/sbin:/sbin

# Initialize and set some variables
MYHOST=""
CMD=""
DEBUG='true'
RUN_AS_ROOT='false'

# Source library of functions
source /usr/local/bin/labtool.shlib
trap on_exit EXIT

# Additional functions for this shell script
function print_usage {
  local problem_name=$(basename $0 | sed -e 's/^lab-//')
  cat << EOF
This script controls the setup and grading of this lab.
Usage: lab ${problem_name} COMMAND
       lab ${problem_name} -h|--help
COMMAND is one of:
    setup - perform any setup steps for this lab on this machine
    grade - perform any grading steps and report on this machine
EOF
}

function write_app.wsgi {
  echo -n "Creating web application files...  "
  cat > ~student/webapp.wsgi << 'EOF'
#!/usr/bin/env python
import time

def application (environ, start_response):
  response_body = 'UNIX EPOCH time is now: %s\n' % time.time()
  status = '200 OK'
  response_headers = [('Content-Type', 'text/plain'),
                      ('Content-Length', '1'),
                      ('Content-Length', str(len(response_body)))]
  start_response(status, response_headers)
  return [response_body]
EOF
  print_SUCCESS
}

function grade_webapp {
  echo -n "Checking for web application...  "
  if ! curl -k https://webapp${X}.example.com 2> /dev/null | grep -q 'UNIX EPOCH' &> /dev/null; then
    print_FAIL
    echo " - Could not connect to https://webapp${X}.example.com,"
    echo "   or wrong content returned."
  else
    print_SUCCESS
  fi
}

function lab_setup {
  VMNAME=$1
  case $VMNAME in
    desktop)
      print_FAIL && echo "The setup script needs to be run on server"
      ;;
    server)
      write_app.wsgi
      ;;
    *)
      # Should never get here, but what the hey....
      print_FAIL && echo "The setup script needs to be run on desktop"
      ;;
  esac
}

function lab_grade {
  VMNAME=$1
  case $VMNAME in
    desktop)
      grade_webapp
      ;;
    server)
      # Obviously adjust this to actual commands if script needs
      # to run on server - and adjust the catchall message with *)
      print_FAIL && echo "The grade script needs to be run on desktop"
      ;;
    *)
      # Should never get here, but what the hey....
      print_FAIL && echo "The grade script needs to be run on desktop"
      ;;
  esac
}

# Main area

# Check if to be run as root (must do this first)
if [[ "${RUN_AS_ROOT}" == 'true' ]] && [[ "${EUID}" -gt "0" ]] ; then
  if [[ -x /usr/bin/sudo ]] ; then
    ${SUDO:-sudo} $0 "$@"
    exit
  else
    # Fail out if not running as root
    check_root
  fi
fi

# Process command line
# Parse input
case $1 in
  setup|grade)
    CMD=$1
    ;;
  -h|--help)
    print_usage
    exit 0
    ;;
  *)
    echo Bad option $1
    print_usage
    exit 1
    ;;
esac
# Validation
[[ -z "$CMD" ]] && debug "Missing command" && print_usage && exit 1

# Get local system information
get_X

# Branch based on short (without number) hostname
case $MYHOST in
  desktop|server)
    lab_$CMD $MYHOST
    ;;
  *)
    debug "Bad or missing hostname - $MYHOST"
    debug "This command needs to be run on desktop or server"
    exit 3
    ;;
esac