#!/bin/sh -e
#
# sessionclean - a script to cleanup stale PHP sessions
#
# Copyright 2013-2015 Ondřej Surý <ondrej@sury.org>
#
# 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.

SAPIS="apache2:apache2\napache2filter:apache2\ncgi:php@VERSION@\nfpm:php@VERSION@-fpm\ncli:php@VERSION@\n"

# Iterate through all web SAPIs
(
for version in $(/usr/sbin/phpquery -V); do
    proc_names=""
    printf "$SAPIS" | \
    while IFS=: read -r conf_dir proc_name; do
	if [ -e /etc/php/${version}/${conf_dir}/php.ini ]; then
	    # Get all session variables once so we don't need to start PHP to get each config option
	    session_config=$(PHP_INI_SCAN_DIR=/etc/php/${version}/${conf_dir}/conf.d/ php${version} -c /etc/php/${version}/${conf_dir}/php.ini -d "error_reporting='~E_ALL'" -r 'foreach(ini_get_all("session") as $k => $v) echo "$k=".$v["local_value"]."\n";')
	    save_handler=$(echo "$session_config" | sed -ne 's/^session\.save_handler=\(.*\)$/\1/p')
	    save_path=$(echo "$session_config" | sed -ne 's/^session\.save_path=\(.*;\)\?\(.*\)$/\2/p')
	    gc_maxlifetime=$(($(echo "$session_config" | sed -ne 's/^session\.gc_maxlifetime=\(.*\)$/\1/p')/60))
	    
	    if [ "$save_handler" = "files" -a -d "$save_path" ]; then
		proc_names="$proc_names $(echo "$proc_name" | sed -e "s,@VERSION@,$version,")";
		printf "%s:%s\n" "$save_path" "$gc_maxlifetime"
	    fi
	fi
    done
done
# first find all open session files and touch them (hope it's not massive amount of files)
for pid in $(pidof $proc_names); do
    find "/proc/$pid/fd" -ignore_readdir_race -lname "$save_path/sess_\*" -exec touch -c {} \;
done ) | \
    sort -rn -t: -k2,2 | \
    sort -u -t: -k 1,1 | \
    while IFS=: read -r save_path gc_maxlifetime; do
	# find all files older then maxlifetime and delete them
	find -O3 "$save_path/" -depth -ignore_readdir_race -mindepth 1 -name 'sess_*' -type f -cmin "+$gc_maxlifetime" -delete
    done

exit 0