apns check payload

gistfile1.py

import struct

def check_payload(string):
    """ check payload
    """
    if not isinstance(string, (str, unicode)):
        return False

    string = [string]
    fmt = "!BH32sH%ds"
    structify = lambda t, p: struct.pack(fmt % len(p), 0, 32, t, len(p), p)
    binaryify = lambda t: t.decode('hex')

    payload = ''.join(map(
        lambda y: structify(*y),
        ((binaryify(t), json.dumps(p, separators=(',', ':'))) for t, p in zip([""], string))
    ))
    return len(payload) <= 250  # return len(payload) <= 256


#  下記でも可能
import json
notifications = {'aps': {
    'alert': "bucho",
    'sound': 'default',
    "badge": 10
}}
len(json.dumps(notification)) > 256

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