#!/bin/sh
# shellcheck shell=dash

set -e

: << =cut

=head1 NAME

nextcloud_groupfolders - Monitor usage of nextcloud groupfolders

=head1 APPLICABLE SYSTEMS

Nexcloud instances with enabled groupfolders app

=head1 CONFIGURATION

Requires installed curl and jq, a command-line json processor.

This is a wildcard plugin. To monitor a groupfolders of a nextcloud 
instance, link nextcloud_groupfolders_<nextcloud-domain> to this file.
You can even append a port (:8443) to the file if needed. For example,

  ln -s /usr/share/munin/plugins/nextcloud_groupfolders_ \
        /etc/munin/plugins/nextcloud_groupfolders_cloud.domain.tld

Set username and password in your munin-node configuration

	[nextcloud_groupfolders_cloud.domain.tld]
	env.username <nexcloud_user>
	env.password <nextcloud_password>
	env.path <default: apps/groupfolders/folders>
	env.scheme <default: https>
	env.timeout <default: 2s>

It's advised to set an app password (for this plugin) in your nextcloud 
instance and not to use the "real" password of your nextcloud user.

=head1 AUTHOR

Copyright (C) 2020 Sebastian L. (https://momou.ch),
		   Olivier Mehani <shtrom+munin@ssji.net>

=head1 LICENSE

GPLv2

=head1 MAGIC MARKERS

 #%# family=manual
 #%# capabilities=autoconf

=cut

# shellcheck disable=SC1090
. "$MUNIN_LIBDIR/plugins/plugin.sh"

if [ "${MUNIN_DEBUG:-0}" = 1 ]; then
    set -x
fi

API_PATH="${api_path:-/apps/groupfolders/folders}?format=json"
DOMAIN="${0##*nextcloud_groupfolders_}"
SCHEME="${scheme:-https}://"
TIMEOUT="${timeout:-2}"
CLEANDOMAIN="$(clean_fieldname "${DOMAIN}")"
USERNAME="${username:-}"
PASSWORD="${password:-}"

fetch_url () {
    curl -s -f -m "${TIMEOUT}" "$@" -H "OCS-APIRequest: true"
}

case $1 in

    autoconf)
	    if [ ! -x "$(command -v curl)" ]; then
		    echo "no (curl not found)"
	    elif [ ! -x "$(command -v jq)" ]; then
		    echo "no (jq not found)"
	    else
		    fetch_url -I -u "${USERNAME}:${PASSWORD}" -I "${SCHEME}${DOMAIN}${API_PATH}" \
			    | grep -iq "Content-Type: application/json" \
			    && echo "yes" \
			    || echo "no (invalid or empty response from nextcloud groupfolder rest api)"
	    fi
	    exit 0
	    ;;
   config)
   
  	DATA=$(fetch_url -u "${USERNAME}:${PASSWORD}" "${SCHEME}${DOMAIN}${API_PATH}" | sed 's/\\/\\\\/g' | jq -r '.ocs.data' )
  	
cat << EOM
multigraph nextcloud_groupfolders_${CLEANDOMAIN}
graph_title Nextcloud groupfolders on ${DOMAIN}
graph_args --base 1000 -l 0
graph_printf %.0lf
graph_vlabel Groupfolders
graph_info Number of groupfolders
graph_category cloud
number.label Number of groupfolders
number.info number of groupfolders
number.min 0
multigraph nextcloud_groupfolders_usage_${CLEANDOMAIN}
graph_title Nextcloud groupfolders usage on ${DOMAIN}
graph_args --base 1000 -l 0
graph_printf %.0lf
graph_vlabel Groupfolders usage
graph_info Sizes of groupfolders
graph_category cloud
EOM

	for FOLDER in $(echo "$DATA" | jq -c 'keys | .[]')
	do
		MOUNTPOINT=$(echo "$DATA" | jq -r ".$FOLDER.mount_point")
		ID=$(echo "$DATA" | jq -r ".$FOLDER.id")
		echo size"$ID".label "$MOUNTPOINT" folder size
		echo size"$ID".info size of groupfolder "$MOUNTPOINT"
		echo size"$ID".draw AREA
		echo size"$ID".min 0
	done

	exit 0
        ;;

esac

DATA=$(fetch_url -u "${USERNAME}:${PASSWORD}" "${SCHEME}${DOMAIN}${API_PATH}" | sed 's/\\/\\\\/g' | jq -r '.ocs.data' )
echo multigraph nextcloud_groupfolders_"${CLEANDOMAIN}"
echo number.value "$(echo "$DATA" | jq length)"
echo multigraph nextcloud_groupfolders_usage_"${CLEANDOMAIN}"
for FOLDER in $(echo "$DATA" | jq -c 'keys | .[]')
do
	ID=$(echo "$DATA" | jq -r ".$FOLDER.id")
	echo size"$ID".value "$(echo "$DATA" | jq -r ".$FOLDER.size" | sed 's/ null$/ U/')"
done