Decoding for JSON

A NotificationContentList can include multiple values. If a NotificationContentList includes multiple values, each value must be concatenated into one string when decoding. The following is an example of a NotificationContentList in JSON API format.

"InitiatorId": "0-1-5-71",
"NotificationContentFlags": 1,
"NotificationContentList": ["H4sIAAAAAAAAAO1aW3PaOBR+z69gPPu2ddfmkgtvBEjKbAJsIJ3Z3ekwwhb​ErbFZ2U7KdPLfV5It\r\nX2TLsmFD2m6YPAR0ztGRzqdPR9L5dtLAH+UXpdtQbv2vl4Fj2nAaIOMBeHDs+tbKMo​BvuY7yLpS8\r\nBDZwDDjabIHhXyM32N5Yno/V/6bt5PMt/i9rO605clYu1Y7sxtIZqZzp4i7kXXG98L31beB5Ix​Nr\r\n65qmVZAdgw0kfbVmQ3XQm/fUcW+uDu/VnudBX9LZ0DHnVqje1PQLVWuq+ulc17sdvau33mv086um\r\ndz​VNYikc32S1gkg4U+UzVj5z1HLJ9BX7c781gQ+lDlVzrNzBsKsKHsZmehs3cIhjqq61zztnp9p7\r\nQbxzqmFn892​WhK4l1XkulfgkmdE+8IHtrkc+3Ay/+hA5wKb4pIi7vuslqGtpA1l4Usaokfa5ROHK\r\nBmsPCzYlchQgef8uBzfq​+G7Yr+1oCLhKLlLRO+i5mKsgVZHEMdT4CJFH

To decode a JSON NotificationContentList, create a Python script named decode.py with the following code:

import sys
import json
import base64
import gzip
import shutil

#from pprint import pprint


def decodeJson(jsonFileName):
  global counter

  with open(jsonFileName) as f:
    data = json.load(f)

  # get list of events
  events = data.get('EventList')
  if events:
    for event in events:
      # get notification list
      eventDetails = event.get("eventDetails")
      notificationContentList = eventDetails.get("NotificationContentList")
      if notificationContentList:
        counter += 1

        # concat the base64/gzip compressed string
        encoded = ""
        for notification in notificationContentList:
          encoded += notification

        # base64 decode the concat string
        compressedData = base64.b64decode(encoded)

        txtFileName = "out" + str(counter) + ".txt"
        gzFileName = txtFileName + ".gz"
         print("writing gz file " + gzFileName)
      
        # write out the gz file
        with open(gzFileName, 'wb') as outfile:
          outfile.write(compressedData)

        # gzip decompresed
        with gzip.open(gzFileName, 'rb') as f_in:
          with open(txtFileName, 'wb') as f_out:
            print("out=" + txtFileName)
            shutil.copyfileobj(f_in, f_out)

counter = 0
for arg in sys.argv[1:]:
   print("running with " + str(arg))
  decodeJson(arg)

To decode, run the following command:

python3 decode.py file.json