graph.py

#!/usr/bin/env python

import requests
import os

auth = ''

def login():
  global auth
  r = requests.post(os.getenv('ZABBIX_URL') + '/api_jsonrpc.php', json = {
    'jsonrpc': '2.0', 'method': 'user.login', 'id': '0', 'params': {
      'user': os.getenv('ZABBIX_USER'), 'password': os.getenv('ZABBIX_PASSWORD')
    }
  })
  auth = r.json()['result']

def zabbix_do(method, params = {}):
  global auth
  r = requests.post(os.getenv('ZABBIX_URL') + '/api_jsonrpc.php', json = {
    'jsonrpc': '2.0', 'method': method, 'id': '0', 'params': params, 'auth': auth
  })
  return r.json()['result']

login()
graphs = zabbix_do('graph.get')
for graph in graphs:
  r = requests.get(os.getenv('ZABBIX_URL') + '/chart2.php', {'graphid': graph['graphid']}, cookies = {'zbx_sessionid':auth})
  f = open(graph['graphid'] + '.png', 'wb')
  f.write(r.content)
  f.close()