#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# Plugin to monitor nextcloud external api statistics
# 	* user activity
# 	* db size
# 	* share count
# 	* available app updates
#
# Parameters understood:
#     config   (required)
#     autoconf (optional - used by munin-config)

# Magic markers - optional - used by installation scripts and
# munin-config:
#
#  #%# family=manual
#  #%# capabilities=autoconf
import requests
import sys
import os
import re


class NextcloudMultiGraph:
	def config(self):
		config = {
			'users': [
				'multigraph nextcloud_users',
				'graph_title Nextcloud User Activity',
				'graph_args --base 1024 -l 0',
				'graph_printf %.0lf',
				'graph_vlabel connected users',
				'graph_info graph showing the number of connected user',
				'graph_category nextcloud',
				'last5minutes.label last 5 minutes',
				'last5minutes.info users connected in the last 5 minutes',
				'last1hour.label last hour',
				'last1hour.info users connected in the last hour',
				'last24hours.label last 24 hours',
				'last24hours.info users connected in the last 24 hours'
			],
			'shares': [
				'multigraph nextcloud_shares',
				'graph_title Nextcloud Shares',
				'graph_args --base 1024 -l 0',
				'graph_vlabel number of shares',
				'graph_info graph showing the number of shares',
				'graph_category nextcloud',
				'num_fed_shares_received.label federated shares recieved',
				'num_fed_shares_received.info current total of federated shares recieved',
				'num_fed_shares_sent.label federated shares sent',
				'num_fed_shares_sent.info current total of federated shares sent',
				'num_shares.label total number of shares',
				'num_shares.info current over all total of shares',
				'num_shares_groups.label group shares',
				'num_shares_groups.info current total of group shares',
				'num_shares_link.label link shares',
				'num_shares_link.info current total of shares through a link',
				'num_shares_link_no_password.label link shares without a password',
				'num_shares_link_no_password.info current total of shares through a link without a password protection',
				'num_shares_user.label user shares',
				'num_shares_user.info current total of user shares'
			],
			'dbsize': [
				'multigraph nextcloud_dbsize',
				'graph_title Nextcloud Database Size',
				'graph_args --base 1024 -l 0',
				'graph_vlabel size in byte',
				'graph_info graph showing the database size in byte',
				'graph_category nextcloud',
				'db_size.label database size in byte',
				'db_size.info users connected in the last 5 minutes',
				'db_size.draw AREA',
			],
			'available_updates': [
				'multigraph nextcloud_available_updates',
				'graph_title Nextcloud available App updates',
				'graph_args --base 1024 -l 0',
				'graph_vlabel updates available',
				'graph_info graph showing the number of available app updates',
				'graph_category nextcloud',
				'num_updates_available.label available app updates',
				'num_updates_available.info number of available app updates',
			]
		}

		return config

	def get_data(self, api_response):
		data ={
			'nextcloud_users': [],
			'nextcloud_shares': [],
			'nextcloud_dbsize': [],
			'nextcloud_available_updates': []
		}
		users  = api_response['ocs']['data']['activeUsers']
		shares = api_response['ocs']['data']['nextcloud']['shares']
		dbsize = api_response['ocs']['data']['server']['database']['size']

		data['nextcloud_users'].append('multigraph nextcloud_users')
		for key in users.keys():
			data['nextcloud_users'].append(str(key) + ".value " + str(users[key]))

		# use regex to remove permission stats from api response
		reg = re.compile("num.*")
		share_keys = shares.keys()
		sharelist = list(filter(reg.match, share_keys))

		data['nextcloud_shares'].append('multigraph nextcloud_shares')
		for key in sharelist:
			data['nextcloud_shares'].append(str(key) + ".value " + str(shares[key]))

		data['nextcloud_dbsize'].append('multigraph nextcloud_dbsize')
		data['nextcloud_dbsize'].append('db_size.value %s' % dbsize)

		# precaution for Nextcloud versions prior to version 14
		try:
			num_updates_available = api_response['ocs']['data']['nextcloud']['system']['apps']['num_updates_available']
			data['nextcloud_available_updates'].append('multigraph nextcloud_available_updates')
			data['nextcloud_available_updates'].append('num_updates_available.value %s' % num_updates_available)
		except KeyError:
			return False

		return data

	def run(self):
		# read the configuration from munin environment
		URL = os.environ['url']
		auth = (os.environ['username'], os.environ['password'])

		# init requests session with specific header and credentials
		with requests.Session() as s:
			s.auth = auth
			s.headers.update({'Accept': 'application/json'})
			s.stream = False

			# request data from api
			r = s.get(URL)

		# if status code is successful close connection and continue
		if r.status_code == 200:
			s.close()
			api_response = r.json()

			result = self.get_data(api_response)

			for key in result.keys():
				print('\n'.join(result[key]))

		elif r.status_code == 996:
			print('server error')
		elif r.status_code == 997:
			print('not authorized')
		elif r.status_code == 998:
			print('not found')
		else:
			print('unknown error')

	def main(self):
		if (sys.argv.__len__() == 2) and (sys.argv[1] == "config"):
			for key in self.config().keys():
				print('\n'.join(self.config()[key]))
			try:
				if os.environ['MUNIN_CAP_DIRTYCONFIG'] == '1':
					self.run()
			except KeyError:
				pass

		elif (sys.argv.__len__() == 2) and (sys.argv[1] == 'autoconf'):
			# check host if env variables are set
			try:
				if None not in {os.environ['url'], os.environ['username'], os.environ['password']}:
					print('yes')
			except KeyError:
				print('no env configuration options are missing')
		else:
			self.run()


if __name__ == "__main__":
	NextcloudMultiGraph().main()
	quit(0)