check_event_hash.py

from synapse.crypto.event_signing import *
from syutil.base64util import encode_base64

import argparse
import hashlib
import sys
import json


class dictobj(dict):
    def __init__(self, *args, **kargs):
        dict.__init__(self, *args, **kargs)
        self.__dict__ = self

    def get_dict(self):
        return dict(self)

    def get_full_dict(self):
        return dict(self)

    def get_pdu_json(self):
        return dict(self)


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("input_json", nargs="?", type=argparse.FileType('r'),
                        default=sys.stdin)
    args = parser.parse_args()
    logging.basicConfig()

    event_json = dictobj(json.load(args.input_json))

    algorithms = {
        "sha256": hashlib.sha256,
    }

    for alg_name in event_json.hashes:
        if check_event_content_hash(event_json, algorithms[alg_name]):
            print "PASS content hash %s" % (alg_name,)
        else:
            print "FAIL content hash %s" % (alg_name,)

    for algorithm in algorithms.values():
        name, h_bytes = compute_event_reference_hash(event_json, algorithm)
        print "Reference hash %s: %s" % (name, encode_base64(h_bytes))

if __name__=="__main__":
    main()