#!/bin/bash

######################################################################
#
#  Copyright (c) 2015 arakasi72 (https://github.com/arakasi72)
#
#  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: 
#
#  The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. 
#
#  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
#  --> Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
#
######################################################################

PATH=/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/bin:/sbin
SERVERIP=$(ip a s eth0 | awk '/inet / {print$2}' | cut -d/ -f1)

if ! [ "$LOGNAME" = "root" ]; then
  echo "Must be run as root, directly or with sudo"
  exit 1
fi

if [ $(dpkg-query -W -f='${Status}' webmin 2>/dev/null | grep -c "ok installed") -eq 0 ]; then
  echo "Installing Webmin"
  echo "deb http://download.webmin.com/download/repository sarge contrib" > /etc/apt/sources.list.d/webmin.list
  wget -qO - http://www.webmin.com/jcameron-key.asc | apt-key add -
  apt-get update  >> /dev/null 2>&1
  apt-get -y install webmin  >> /dev/null 2>&1
else
  echo 'Webmin is already installed'
fi

#changes to the webmin config file
if [ -z "$(grep ^referers_none= /etc/webmin/config)" ]; then
  echo "referers_none=1" >> /etc/webmin/config
else
  sed -i '/^referers_none=/ c\referers_none=1' /etc/webmin/config
fi

if [ -z "$(grep ^referers= /etc/webmin/config)" ]; then
  echo "referers=localhost" >> /etc/webmin/config
else
  sed -i '/^referers=/ c\referers=localhost' /etc/webmin/config
fi

if [ -z "$(grep ^webprefix= /etc/webmin/config)" ]; then
  echo "webprefix=/webmin" >> /etc/webmin/config
else
  sed -i '/^webprefix=/ c\webprefix=\/webmin' /etc/webmin/config
fi

if [ -z "$(grep ^webprefixnoredir= /etc/webmin/config)" ]; then
  echo "webprefixnoredir=1" >> /etc/webmin/config
else
  sed -i '/^webprefixnoredir=/ c\webprefixnoredir=1' /etc/webmin/config
fi

if [ -z "$(grep ^referer= /etc/webmin/config)" ]; then
  echo "referer=1" >> /etc/webmin/config
else
  sed -i '/^referer=/ c\referer=1' /etc/webmin/config
fi

if [ -z "$(grep ^ssl= /etc/webmin/miniserv.conf)" ]; then
  echo "ssl=0" >> /etc/webmin/miniserv.conf
else
  sed -i '/^ssl=/ c\ssl=0' /etc/webmin/miniserv.conf
fi

echo "Setting up Nginx Reverse Proxy"

#set up default proxy settings
echo 'proxy_redirect off;' > /etc/nginx/conf.d/proxy.conf
echo 'proxy_set_header Host $host;' >> /etc/nginx/conf.d/proxy.conf
echo 'proxy_set_header X-Real-IP $remote_addr;' >> /etc/nginx/conf.d/proxy.conf
echo 'proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;' >> /etc/nginx/conf.d/proxy.conf
echo 'proxy_cache off;' >> /etc/nginx/conf.d/proxy.conf
echo 'proxy_buffering off;' >> /etc/nginx/conf.d/proxy.conf

#include webmin location in main nginx site file
sed -i '/webmin-loc/d' /etc/nginx/sites-available/default
sed -i '/^$/N;/^\n$/D'   /etc/nginx/sites-available/default
lineno=$(grep -Fn 'location ~ /\.ht' /etc/nginx/sites-available/default | cut -d : -f 1 | tail -1)
sed -i $lineno"i\        include \/etc\/nginx\/sites-available\/webmin-loc;\n" /etc/nginx/sites-available/default

#write the webmin nginx location file
echo 'location /webmin/ {' > /etc/nginx/sites-available/webmin-loc
echo '       proxy_pass http://localhost:10000/;' >> /etc/nginx/sites-available/webmin-loc
echo '       proxy_redirect http://$host:10000/ /webmin/;' >> /etc/nginx/sites-available/webmin-loc
echo '}' >> /etc/nginx/sites-available/webmin-loc

#restart services
service webmin restart  >> /dev/null 2>&1
service nginx restart  >> /dev/null 2>&1
echo "Completed"
echo
echo "Webmin can be accessed at https://$SERVERIP/webmin"
echo "login using root, or sudo user credentials"