#!/bin/bash
#
# vhost-stack
# https://git.stack-source.com/msb/vhost-stack
# MIT License Copyright (c) 2021 Matthew Saunders Brown

# load include file
source $(dirname $0)/vhost.sh

help()
{
  thisfilename=$(basename -- "$0")
  echo "Enables Varnish for specified virtualhost."
  echo ""
  echo "usage: $thisfilename virtualhost. [OPTIONS]"
  echo ""
  echo "  -h    Print this help."
  echo ""
  echo "        Creates Varnish config, loads it in Varnish and then"
  echo "        enables Apache proxy to Varnish for virtualhost."
  exit
}

# check for and set virtualhost
# check for and set username
if [ -n "$1" ]; then
  if [ $1 == "-h" ]; then
    help
  else
    virtualhost="${1,,}"
    shift
  fi
else
  echo "virtualhost not set"
  exit 1
fi

# make sure virtualhost is enabled via symlink
if [ ! -h "/etc/apache2/sites-enabled/$virtualhost.conf" ]; then
  echo "virtualhost is not enabled"
  exit 1
fi

# make sure virtualhost config is in standard location
if [ ! -f "/etc/apache2/sites-available/$virtualhost.conf" ]; then
  echo "virtualhost config for $virtualhost not in /etc/apache2/sites-available/"
  exit 1
fi

# grab macro line from virtualhost config
if macro_vhost_line=`grep -m 1 "Use .*" /etc/apache2/sites-available/$virtualhost.conf` ; then
  macro_name=`echo "$macro_vhost_line" | awk '{print $2}'`
else
  echo "$virtualhost is not configured with mod_macro"
  exit 1
fi

# make sure Varnish is not already enabled
if [[ $macro_name =~ ^.*Varnish$ ]]; then
  echo "Varnish already enabled for $virtualhost"
  exit 1
fi

# check for valid HTTPS VHost macro
if [[ $macro_name =~ ^VHost[[:alpha:]]*HTTPS$ ]]; then
  macro_name_new="${macro_name}Varnish"
  vhost_enable="$macro_name_new $virtualhost"
else
  echo "$virtualhost must be enabled with an HTTPS VHost macro"
  exit 1
fi

# check if VHost macro is for a Subdomain
if [[ "$macro_name" == *"Subdomain"* ]]; then
  vhost_subdomain=`echo "$macro_vhost_line" | awk '{print $5}'`
  vhost_enable=$(echo "$vhost_enable" | sed -e "s/ $vhost_subdomain\./ /")
  vhost_enable="$vhost_enable $vhost_subdomain"
fi

# check if VHost macro is for an Alias
if [[ "$macro_name" == *"Alias"* ]]; then
  vhost_alias=`echo "$macro_vhost_line" | awk '{print $5}'`
  vhost_enable="$vhost_enable $vhost_alias"
fi

# check for ssl cert
if [ ! -f "/etc/ssl/letsencrypt/$virtualhost.pem" ]; then
  echo "$virtualhost.pem cert file does not exist"
  exit 1
fi

# make sure varnish is installed
if [ ! -f /etc/varnish/sites.d/example.com.vcl ]; then
  echo "Varnish not installed & configured on this server"
  exit 1
fi

# check for / create varnish config
if [ ! -f "/etc/varnish/sites.d/$virtualhost.vcl" ]; then
  # create varnish config
  echo "sub vcl_recv {" > /etc/varnish/sites.d/$virtualhost.vcl
  echo "  if (req.http.host == \"$virtualhost\" || req.http.host == \"www.$virtualhost\") {" >> /etc/varnish/sites.d/$virtualhost.vcl
  echo "    # Uncomment next line to bypass varnish cache" >> /etc/varnish/sites.d/$virtualhost.vcl
  echo "    #return (pass);" >> /etc/varnish/sites.d/$virtualhost.vcl
  echo "    call wordpress;" >> /etc/varnish/sites.d/$virtualhost.vcl
  echo "  }" >> /etc/varnish/sites.d/$virtualhost.vcl
  echo "}" >> /etc/varnish/sites.d/$virtualhost.vcl
  /usr/local/bin/vhost-varnish-update-sites.sh
  systemctl is-active --quiet varnish && systemctl reload --quiet varnish
fi

/usr/local/bin/vhost-enable.sh $vhost_enable