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test_external_content.py
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"""
Unit tests for external content such as recording, attachments which are stored
as URLs with a signature for the content stored else where. Using
Leighton-Micali One Time Signature (RFC8554).
"""
import os
import datetime
import pytest
import vcon
import vcon.security
import hsslms
import hashlib
import jose.utils
call_data = {
"epoch" : "1652552179",
"destination" : "2117",
"source" : "+19144345359",
"rfc2822" : "Sat, 14 May 2022 18:16:19 -0000",
"rfc3339" : "2022-05-14T18:16:19.000+00:00",
"file_extension" : "WAV",
"duration" : 94.84,
"channels" : 1
}
@pytest.fixture(scope="function")
def empty_vcon() -> vcon.Vcon:
""" construct vCon with no data """
vCon = vcon.Vcon()
return(vCon)
@pytest.fixture(scope="function")
def two_party_tel_vcon(empty_vcon : vcon.Vcon) -> vcon.Vcon:
""" construct vCon with two tel URL """
vCon = empty_vcon
first_party = vCon.set_party_parameter("tel", call_data['source'])
second_party = vCon.set_party_parameter("tel", call_data['destination'])
vCon.set_uuid("vcon.dev")
return(vCon)
def test_lm_ots_sign() -> None:
file_size = 2048
fake_file = os.urandom(file_size)
key, sig = vcon.security.lm_one_time_signature(fake_file)
vcon.security.verify_lm_one_time_signature(fake_file, sig, key)
try:
# cause signature to fail
vcon.security.verify_lm_one_time_signature(fake_file, sig.replace("D", "E", 1), key)
raise Exception("Should have raisee and INVALID signature error")
except hsslms.utils.INVALID as invalid_error:
# Expect this to be raised as we have modified signature
pass
try:
# cause key to fail
vcon.security.verify_lm_one_time_signature(fake_file, sig, key.replace("A", "Z", 1))
raise Exception("Should have raised and INVALID key error")
except hsslms.utils.INVALID as invalid_error:
# Expect this to be raised as we have modified signature
pass
def test_get_external_recording(two_party_tel_vcon : vcon.Vcon) -> None:
# Add external ref
file_path = "examples/agent_sample.wav"
url = "https://github.com/vcon-dev/vcon/blob/main/examples/agent_sample.wav?raw=true"
file_content = b""
with open(file_path, "rb") as file_handle:
file_content = file_handle.read()
print("body length: {}".format(len(file_content)))
assert(len(file_content) > 10000)
dialog_index = two_party_tel_vcon.add_dialog_external_recording(file_content,
datetime.datetime.utcnow(),
0, # duration TODO
[0,1],
url,
vcon.Vcon.MIMETYPE_AUDIO_WAV,
os.path.basename(file_path))
assert(dialog_index == 0)
body_bytes = two_party_tel_vcon.get_dialog_external_recording(dialog_index)
assert(len(file_content) == len(body_bytes))
assert(file_content == body_bytes)
# This should be valid
two_party_tel_vcon.verify_dialog_external_recording(0, body_bytes)
body_byte_array = bytearray(body_bytes)
body_byte_array[0] = body_bytes[0] + 1
body_bytes = bytes(body_byte_array)
assert(file_content != body_bytes)
try:
#We modified the body_bytes so this should fail
two_party_tel_vcon.verify_dialog_external_recording(0, body_bytes)
raise Exception("Should have thrown invalid as body_bytes is not identical")
except vcon.InvalidVconHash as invalid_body_error:
# We expect this to occur
pass
def test_external_recording_lm_ots(two_party_tel_vcon : vcon.Vcon) -> None:
data_size = 4096
data = os.urandom(data_size)
url = "https://example.com?q=\"ddd\"&y=\'!\'"
#print("url: {}".format(url))
file_name = "my_rec.wav"
assert(vcon.Vcon.MIMETYPE_AUDIO_WAV == "audio/x-wav")
two_party_tel_vcon.add_dialog_external_recording(data,
call_data["rfc2822"],
call_data["duration"],
0,
url,
vcon.Vcon.MIMETYPE_AUDIO_WAV,
file_name,
sign_type="LM-OTS")
vcon_json = two_party_tel_vcon.dumps()
new_vcon = vcon.Vcon()
new_vcon.loads(vcon_json)
assert(len(new_vcon.dialog) == 1)
assert(new_vcon.dialog[0]['type'] == "recording")
assert(new_vcon.dialog[0]['url'] == url)
assert(new_vcon.dialog[0]['parties'] == 0)
assert(new_vcon.dialog[0]['start'] == call_data["rfc3339"])
assert(new_vcon.dialog[0]['duration'] == call_data["duration"])
assert(new_vcon.dialog[0]['mimetype'] == "audio/x-wav")
assert(new_vcon.dialog[0]['filename'] == file_name)
assert(new_vcon.dialog[0]['alg'] == 'LMOTS_SHA256_N32_W8')
assert(len(new_vcon.dialog[0]['key']) > 1)
assert("body" not in new_vcon.dialog[0])
new_vcon.verify_dialog_external_recording(0, data)
try:
# Change the data so that validation should fail
new_vcon.verify_dialog_external_recording(0, data[1:])
raise Exception("Should have raised exception here as data is missin the first byte")
except hsslms.utils.INVALID as invalid_error:
# Expect to get this exception
pass
def test_sha512():
data1 = b"test some text stuff as binary"
data_size = 4096
data2 = os.urandom(data_size)
hasher = hashlib.sha512()
hasher.update(data1)
hasher.update(data2)
sig_hash = jose.utils.base64url_encode(hasher.digest())
validater = hashlib.sha512()
validater.update(data1 + data2)
validate_hash = jose.utils.base64url_encode(validater.digest())
assert(sig_hash == validate_hash)
def test_external_recording_sha_512(two_party_tel_vcon : vcon.Vcon) -> None:
data_size = 4096
data = os.urandom(data_size)
url = "https://example.com?q=\"ddd\"&y=\'!\'"
#print("url: {}".format(url))
file_name = "my_rec.wav"
assert(vcon.Vcon.MIMETYPE_AUDIO_WAV == "audio/x-wav")
two_party_tel_vcon.add_dialog_external_recording(data,
call_data["rfc2822"],
call_data["duration"],
0,
url,
vcon.Vcon.MIMETYPE_AUDIO_WAV,
file_name)
vcon_json = two_party_tel_vcon.dumps()
print("original: {}".format(vcon_json))
new_vcon = vcon.Vcon()
new_vcon.loads(vcon_json)
print("deserialized: {}".format(new_vcon.dumps()))
assert(len(new_vcon.dialog) == 1)
assert(new_vcon.dialog[0]['type'] == "recording")
assert(new_vcon.dialog[0]['url'] == url)
assert(new_vcon.dialog[0]['parties'] == 0)
assert(new_vcon.dialog[0]['start'] == call_data["rfc3339"])
assert(new_vcon.dialog[0]['duration'] == call_data["duration"])
assert(new_vcon.dialog[0]['mimetype'] == "audio/x-wav")
assert(new_vcon.dialog[0]['filename'] == file_name)
assert(new_vcon.dialog[0]['alg'] == 'SHA-512')
assert("body" not in new_vcon.dialog[0])
assert("key" not in new_vcon.dialog[0])
new_vcon.verify_dialog_external_recording(0, data)
try:
# Change the data so that validation should fail
new_vcon.verify_dialog_external_recording(0, data[1:])
raise Exception("Should have raised exception here as data is missin the first byte")
except vcon.InvalidVconHash as invalid_error:
# Expect to get this exception
pass