#!/bin/sh
#
# Manage apache webdav
#	- after mounting: add the new webdav share
#	- before umounting: disable and remove the webdav share
#
# This script assumes, that you added the apache2_dav.conf file
# (/usr/share/doc/cryptobox/conf-examples/) to your apache configuration directory
# (e.g. /etc/apache2/conf.d)
#
#
# Params:	$event $volume_name $volume_type $mount_dir
#
#	event:	premount | postmount | preumount | postumount
#	device:	name of the device
#	volume_name:	name of the volume
#	volume_type:	plain | luks
#	mount_dir:	mount directory
#

set -eu

# ------------=-=-=- some settings -=-=-=-----------------
# adapt this part of the file to your setup

APACHE_SCRIPT=/etc/init.d/apache2
APACHE_CONF_DIR=/var/cache/cryptobox/apache2_dav.conf.d

# this apache config snippet is used for every published volume
# _VOLUME_NAME_ and _SHARE_DIR_ are replaced by their actual values
APACHE_SHARE_TEMPLATE=$(cat - <<-"EOF"
	# this file is part of the CryptoBox
	Alias	"/cryptobox/_VOLUME_NAME_" "_SHARE_DIR_"
	<Location "/cryptobox/_VOLUME_NAME_">
		Dav filesystem
	</Location>
EOF
)

# -----=-=-=- check arguments and the environment -=-=-=----

# exit if apache2 is not installed
if test -x "$APACHE_SCRIPT"
  then	true
  else	echo "apache2 is not installed ('$APACHE_SCRIPT' not found)" >&2
	exit 1
 fi

# create include-file directory
mkdir -p "$APACHE_CONF_DIR"

# check event argument
if test "$#" -eq 0
  then	echo "Syntax: $(basename $0) EVENT [EVENT_INFORMATION]" >&2
	exit 1
 fi

event=$1

# ------------=-=-=- some functions -=-=-=-----------------

# remove invalid config files
update_include_conf_dir()
{
	find "$APACHE_CONF_DIR" -type f -name "*.conf" | while read fname
	  do	mdir=$(head -1 "$fname" | cut -f 4 -d '"')
	  		test ! -d "$mdir" && rm "$fname"
	 done
}

empty_conf_dir()
{
	find "$APACHE_CONF_DIR" -type f -name "*.conf" -print0 | xargs -0 rm
}

send_reload_command()
{
	# reload config files
	"$APACHE_SCRIPT" reload
}

# -----------------=-=-=- main -=-=-=----------------------

case "$event" in
	premount|postumount )
		;;
	postmount )
		vol_name=$3
		mount_dir=$5
		echo "$APACHE_SHARE_TEMPLATE" | sed "s#_SHARE_DIR_#$mount_dir#g; s#_VOLUME_NAME_#$vol_name#g" >"$APACHE_CONF_DIR/${vol_name}.conf"
		update_include_conf_dir
		send_reload_command
		;;
	preumount )
		vol_name=$3
		rm "$APACHE_CONF_DIR/${vol_name}.conf" || true
		update_include_conf_dir
		send_reload_command
		;;
	shutdown | bootup )
		empty_conf_dir
		;;
	* )
		# ignore all events that we do not support
		exit 0
		;;
  esac

exit 0