#!/bin/sh
# shellcheck shell=dash

set -e

: << =cut

=head1 NAME

nextcloud_ - Monitor usage of nextcloud instances

=head1 APPLICABLE SYSTEMS

Nexcloud instances

=head1 CONFIGURATION

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

This is a wildcard plugin. To monitor a nextcloud instance, link
nextcloud_<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_ \
        /etc/munin/plugins/nextcloud_cloud.domain.tld

Set username and password in your munin-node configuration

	[nextcloud_cloud.domain.tld]
	env.username <nexcloud_user>
	env.password <nextcloud_password>
	env.api_path <default: /ocs/v2.php/apps/serverinfo/api/v1/info>
	env.scheme <default: https>
	env.timeout <default: 2s>
	env.updates_warning <default: 1>

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="${api_path:-/ocs/v2.php/apps/serverinfo/api/v1/info}?format=json&skipApps=false"
DOMAIN="${0##*nextcloud_}"
SCHEME="${scheme:-https}://"
TIMEOUT="${timeout:-2}"
UPDATES_WARNING="${updates_warning:-1}"
CLEANDOMAIN="$(clean_fieldname "${DOMAIN}")"
USERNAME="${username:-}"
PASSWORD="${password:-}"

fetch_url () {
    curl -s -f -m "${TIMEOUT}" "$@"
}

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 serverinfo api)"
	    fi
	    exit 0
	    ;;
   config)

cat << EOM
multigraph nextcloud_users_${CLEANDOMAIN}
graph_title Nextcloud users on ${DOMAIN}
graph_args --base 1000 -l 0
graph_printf %.0lf
graph_vlabel connected users
graph_info number of connected user
graph_category cloud
last5minutes.label last 5 minutes
last5minutes.info users connected in the last 5 minutes
last5minutes.min 0
last1hour.label last hour
last1hour.info users connected in the last hour
last1hour.min 0
last24hours.label last 24 hours
last24hours.info users connected in the last 24 hours
last24hours.min 0
num_users.label number of users
num_users.info total number of users
num_users.min 0
multigraph nextcloud_files_${CLEANDOMAIN}
graph_title Nextcloud files on ${DOMAIN}
graph_args --base 1000 -l 0
graph_printf %.0lf
graph_vlabel number of files
graph_info number of files
graph_category cloud
num_files.label number of files
num_files.info current number of files
num_files.min 0
multigraph nextcloud_shares_${CLEANDOMAIN}
graph_title Nextcloud shares on ${DOMAIN}
graph_args --base 1000 -l 0
graph_printf %.0lf
graph_vlabel number of shares
graph_info number of shares
graph_category cloud
num_shares.label total number of shares
num_shares.info current over all total of shares
num_shares.min 0
num_shares_user.label user shares
num_shares_user.info current total of user shares
num_shares_user.min 0
num_shares_groups.label group shares
num_shares_groups.info current total of group shares
num_shares_groups.min 0
num_shares_link.label link shares
num_shares_link.info current total of link shares
num_shares_link.min 0
num_shares_mail.label mail shares
num_shares_mail.info current total of mail shares
num_shares_mail.min 0
num_shares_room.label room shares
num_shares_room.info current total of room shares
num_shares_room.min 0
num_shares_link_no_password.label link shares without password protection
num_shares_link_no_password.info current total of link shares without password protection
num_shares_link_no_password.min 0
num_fed_shares_sent.label federated shares sent
num_fed_shares_sent.info current total of federated shares sent
num_fed_shares_sent.min 0
num_fed_shares_received.label federated shares received
num_fed_shares_received.info current total of federated shares received
num_fed_shares_received.min 0
multigraph nextcloud_dbsize_${CLEANDOMAIN}
graph_title Nextcloud database size on ${DOMAIN}
graph_args --base 1024 -l 0
graph_vlabel size in bytes
graph_info database database size in bytes
graph_category cloud
db_size.label database size in bytes
db_size.info database size in bytes
db_size.draw AREA
db_size.min 0
multigraph nextcloud_storages_${CLEANDOMAIN}
graph_title Nextcloud storages on ${DOMAIN}
graph_args --base 1000 -l 0
graph_printf %.0lf
graph_vlabel number
graph_info number of storages
graph_category cloud
num_storages.label total number of storages
num_storages.info current total of storages
num_storages.min 0
num_storages_local.label number of local storages
num_storages_local.info current number of local storages
num_storages_local.min 0
num_storages_home.label number of home storages
num_storages_home.info current number of home storages
num_storages_home.min 0
num_storages_other.label number of other storages
num_storages_other.info current number of other storages
num_storages_other.min 0
multigraph nextcloud_apps_${CLEANDOMAIN}
graph_title Nextcloud apps on ${DOMAIN}
graph_args --base 1000 -l 0
graph_printf %.0lf
graph_vlabel apps
graph_info number of installed and updatable apps
graph_category cloud
num_updates_available.label available app updates
num_updates_available.info number of available app updates
num_updates_available.min 0
num_updates_available.warning ${UPDATES_WARNING}
num_installed.label installed apps
num_installed.info number of installed apps
num_installed.min 0
EOM
	exit 0
        ;;

esac


# users
fetch_url -u "${USERNAME}:${PASSWORD}" "${SCHEME}${DOMAIN}${API_PATH}" \
	| sed 's/\\/\\\\/g' \
	| jq -r '.ocs.data
		| @text "
multigraph nextcloud_users_'"${CLEANDOMAIN}"'
last5minutes.value \(.activeUsers.last5minutes)
last1hour.value \(.activeUsers.last1hour)
last24hours.value \(.activeUsers.last24hours)
num_users.value \(.nextcloud.storage.num_users)

multigraph nextcloud_files_'"${CLEANDOMAIN}"'
num_files.value \(.nextcloud.storage.num_files)

multigraph nextcloud_storages_'"${CLEANDOMAIN}"'
num_storages.value \(.nextcloud.storage.num_storages)
num_storages_local.value \(.nextcloud.storage.num_storages_local)
num_storages_home.value \(.nextcloud.storage.num_storages_home)
num_storages_other.value \(.nextcloud.storage.num_storages_other)

multigraph nextcloud_shares_'"${CLEANDOMAIN}"'
num_shares.value \(.nextcloud.shares.num_shares)
num_shares_user.value \(.nextcloud.shares.num_shares_user)
num_shares_groups.value \(.nextcloud.shares.num_shares_groups)
num_shares_link.value \(.nextcloud.shares.num_shares_link)
num_shares_mail.value \(.nextcloud.shares.num_shares_mail)
num_shares_room.value \(.nextcloud.shares.num_shares_room)
num_shares_link_no_password.value \(.nextcloud.shares.num_shares_link_no_password)
num_fed_shares_sent.value \(.nextcloud.shares.num_fed_shares_sent)
num_fed_shares_received.value \(.nextcloud.shares.num_fed_shares_received)

multigraph nextcloud_dbsize_'"${CLEANDOMAIN}"'
db_size.value \(.server.database.size)

multigraph nextcloud_apps_'"${CLEANDOMAIN}"'
num_installed.value \(.nextcloud.system.apps.num_installed)
num_updates_available.value \(.nextcloud.system.apps.num_updates_available)
"' \
	| sed 's/ null$/ U/'