#!/bin/bash

# Version 1.3
#
# v1.3 CHANGES:
# - Added check for configured apoache-user and basepath exist.
# v1.2 CHANGES:
# - Updated nextcloud release check to actually get latest version from the release-url
# v1.1 CHANGES:
# - Updated query for installed version to versionstring instead of version
#
# WARNING: Current logic in the check will report wrong version as upgrade when a release is withdrawn from a/the release-url.

# Installation:
# This file should be place on a/the nextcloud host in /usr/lib/check_mk_agent/local
# Also do not forget to make this file executable with chmod +x /usr/lib/check_mk_agent/local/nextcloud-updates.sh
#

RELEASEURL="https://download.nextcloud.com/server/releases/"

#basepath of Nextcloud's occ executable

BASEPATH="/var/www/html"

# set the correct user for running the commands ( either apache or www-data, this depends on your Linux-Distribution)

APACHEUSER="apache"

# check if jq package is present on the system
/usr/bin/which jq >/dev/null 2>&1
if [ $? -ne 0 ]; then
    echo "2 \"NextCloud\" - NextCloud localcheck requires jq package to be installed"
    echo "2 \"NextCloud Apps\" - NextCloud localcheck requires jq package to be installed"
    exit;
fi

# check if configured apache user exists
if ! id -u "$APACHEUSER" >/dev/null 2>&1; then
    echo "2 \"NextCloud\" - NextCloud localcheck webserver user does not exist, check configuration!"
    echo "2 \"NextCloud Apps\" - NextCloud localcheck webserver user does not exist, check configuration!"
    exit;
fi

# check if configured basepath exists
if [ ! -d "$BASEPATH" ]; then
    echo "2 \"NextCloud\" - NextCloud localcheck could not find configured basepath, check configuration!"
    echo "2 \"NextCloud Apps\" - NextCloud localcheck could not find configured basepath, check configuration!"
    exit;
fi

# Get current installed Nextcloud version-information
# in v29.x.x version gives more detail, which is not given by the check on installed version, so switched to versionstring instead.

NCINSTALLED=$(sudo -u $APACHEUSER php $BASEPATH/occ status --output=json | jq -r '.versionstring')

# Get latest avaiable version information
# In v29.x.x this has changed outputs <name-of-instance> <version>,

NCAVAILABLE=$(curl -s $RELEASEURL | sed -e 's/<[^>]*>//g' | grep -o "^nextcloud.*.zip" | tail -n1 | cut -d'-' -f 2 | sed 's/.\{4\}$//')

# compare resuts of installed and available version and report update available if they differ
if [ $NCINSTALLED != $NCAVAILABLE ]; then
   echo "1 \"NextCloud\" - A new NextCloud version ($NCAVAILABLE)is available, running version $NCINSTALLED please upgrade"
else
    sudo -u $APACHEUSER php $BASEPATH/occ status -e
    if [ $? -eq 0 ]; then
        echo "0 \"NextCloud\" - NextCloud all up to date"
    elif [ $? -eq 1 ]; then
        echo "1 \"NextCloud\" - NextCloud maintenance-mode is enabled"
    elif [ $? -eq 2 ]; then
        echo "2 \"NextCloud\" - NextCloud Core needs updating"
    fi
fi

APPRESULT=$(sudo -u $APACHEUSER php $BASEPATH/occ app:update --showonly)
if [[ $APPRESULT == *"All apps are up-to-date"* ]]; then
    echo "0 \"NextCloud Apps\" - NextCloud Apps all up to date"
else
    UPDATECOUNT=$(echo "$APPRESULT" | wc -l)
    echo "1 \"NextCloud Apps\" - $UPDATECOUNT NextCloud Apps requires updates"
fi