aioesphomeapi/tests/test__frame_helper.py

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from __future__ import annotations
import asyncio
import base64
from typing import Any
from unittest.mock import AsyncMock, MagicMock, patch
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import pytest
from noise.connection import NoiseConnection # type: ignore[import-untyped]
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from aioesphomeapi import APIConnection
from aioesphomeapi._frame_helper import APINoiseFrameHelper, APIPlaintextFrameHelper
from aioesphomeapi._frame_helper.noise import ESPHOME_NOISE_BACKEND
from aioesphomeapi._frame_helper.plain_text import (
_cached_varuint_to_bytes as cached_varuint_to_bytes,
)
from aioesphomeapi._frame_helper.plain_text import _varuint_to_bytes as varuint_to_bytes
from aioesphomeapi.connection import ConnectionState
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from aioesphomeapi.core import (
APIConnectionError,
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BadNameAPIError,
HandshakeAPIError,
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InvalidEncryptionKeyAPIError,
ProtocolAPIError,
SocketClosedAPIError,
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)
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from .common import get_mock_protocol, mock_data_received
from .conftest import get_mock_connection_params
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PREAMBLE = b"\x00"
NOISE_HELLO = b"\x01\x00\x00"
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def _extract_encrypted_payload_from_handshake(handshake_pkt: bytes) -> bytes:
noise_hello = handshake_pkt[0:3]
pkt_header = handshake_pkt[3:6]
assert noise_hello == NOISE_HELLO
assert pkt_header[0] == 1 # type
pkg_length_high = pkt_header[1]
pkg_length_low = pkt_header[2]
pkg_length = (pkg_length_high << 8) + pkg_length_low
assert pkg_length == 49
noise_prefix = handshake_pkt[6:7]
assert noise_prefix == b"\x00"
return handshake_pkt[7:]
def _make_noise_hello_pkt(hello_pkt: bytes) -> bytes:
"""Make a noise hello packet."""
preamble = 1
hello_pkg_length = len(hello_pkt)
hello_pkg_length_high = (hello_pkg_length >> 8) & 0xFF
hello_pkg_length_low = hello_pkg_length & 0xFF
hello_header = bytes((preamble, hello_pkg_length_high, hello_pkg_length_low))
return hello_header + hello_pkt
def _make_noise_handshake_pkt(proto: NoiseConnection) -> bytes:
handshake = proto.write_message(b"")
handshake_pkt = b"\x00" + handshake
preamble = 1
handshake_pkg_length = len(handshake_pkt)
handshake_pkg_length_high = (handshake_pkg_length >> 8) & 0xFF
handshake_pkg_length_low = handshake_pkg_length & 0xFF
handshake_header = bytes(
(preamble, handshake_pkg_length_high, handshake_pkg_length_low)
)
return handshake_header + handshake_pkt
def _make_encrypted_packet(
proto: NoiseConnection, msg_type: int, payload: bytes
) -> bytes:
msg_type = 42
msg_type_high = (msg_type >> 8) & 0xFF
msg_type_low = msg_type & 0xFF
msg_length = len(payload)
msg_length_high = (msg_length >> 8) & 0xFF
msg_length_low = msg_length & 0xFF
msg_header = bytes((msg_type_high, msg_type_low, msg_length_high, msg_length_low))
encrypted_payload = proto.encrypt(msg_header + payload)
return _make_encrypted_packet_from_encrypted_payload(encrypted_payload)
def _make_encrypted_packet_from_encrypted_payload(encrypted_payload: bytes) -> bytes:
preamble = 1
encrypted_pkg_length = len(encrypted_payload)
encrypted_pkg_length_high = (encrypted_pkg_length >> 8) & 0xFF
encrypted_pkg_length_low = encrypted_pkg_length & 0xFF
encrypted_header = bytes(
(preamble, encrypted_pkg_length_high, encrypted_pkg_length_low)
)
return encrypted_header + encrypted_payload
def _mock_responder_proto(psk_bytes: bytes) -> NoiseConnection:
proto = NoiseConnection.from_name(
b"Noise_NNpsk0_25519_ChaChaPoly_SHA256", backend=ESPHOME_NOISE_BACKEND
)
proto.set_as_responder()
proto.set_psks(psk_bytes)
proto.set_prologue(b"NoiseAPIInit\x00\x00")
proto.start_handshake()
return proto
def _make_mock_connection() -> tuple[APIConnection, list[tuple[int, bytes]]]:
"""Make a mock connection."""
packets: list[tuple[int, bytes]] = []
class MockConnection(APIConnection):
def __init__(self, *args: Any, **kwargs: Any) -> None:
"""Swallow args."""
super().__init__(
get_mock_connection_params(), AsyncMock(), True, None, *args, **kwargs
)
def process_packet(self, type_: int, data: bytes):
packets.append((type_, data))
connection = MockConnection()
return connection, packets
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class MockAPINoiseFrameHelper(APINoiseFrameHelper):
def __init__(self, *args: Any, writer: Any | None = None, **kwargs: Any) -> None:
"""Swallow args."""
super().__init__(*args, **kwargs)
transport = MagicMock()
transport.write = writer or MagicMock()
self.__transport = transport
self.connection_made(transport)
def connection_made(self, transport: Any) -> None:
return super().connection_made(self.__transport)
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def mock_write_frame(self, frame: bytes) -> None:
"""Write a packet to the socket.
The entire packet must be written in a single call to write.
"""
frame_len = len(frame)
header = bytes((0x01, (frame_len >> 8) & 0xFF, frame_len & 0xFF))
try:
self._writer(header + frame)
except (RuntimeError, ConnectionResetError, OSError) as err:
raise SocketClosedAPIError(
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f"{self._log_name}: Error while writing data: {err}"
) from err
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@pytest.mark.parametrize(
"in_bytes, pkt_data, pkt_type",
[
(PREAMBLE + varuint_to_bytes(0) + varuint_to_bytes(1), b"", 1),
(
PREAMBLE + varuint_to_bytes(192) + varuint_to_bytes(1) + (b"\x42" * 192),
(b"\x42" * 192),
1,
),
(
PREAMBLE + varuint_to_bytes(192) + varuint_to_bytes(100) + (b"\x42" * 192),
(b"\x42" * 192),
100,
),
(
PREAMBLE + varuint_to_bytes(4) + varuint_to_bytes(100) + (b"\x42" * 4),
(b"\x42" * 4),
100,
),
(
PREAMBLE
+ varuint_to_bytes(8192)
+ varuint_to_bytes(8192)
+ (b"\x42" * 8192),
(b"\x42" * 8192),
8192,
),
(
PREAMBLE + varuint_to_bytes(256) + varuint_to_bytes(256) + (b"\x42" * 256),
(b"\x42" * 256),
256,
),
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(
PREAMBLE + varuint_to_bytes(1) + varuint_to_bytes(32768) + b"\x42",
b"\x42",
32768,
),
(
PREAMBLE
+ varuint_to_bytes(32768)
+ varuint_to_bytes(32768)
+ (b"\x42" * 32768),
(b"\x42" * 32768),
32768,
),
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],
)
def test_plaintext_frame_helper(
in_bytes: bytes, pkt_data: bytes, pkt_type: int
) -> None:
for _ in range(3):
connection, packets = _make_mock_connection()
helper = APIPlaintextFrameHelper(
connection=connection, client_info="my client", log_name="test"
)
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mock_data_received(helper, in_bytes)
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pkt = packets.pop()
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type_, data = pkt
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assert type_ == pkt_type
assert data == pkt_data
# Make sure we correctly handle fragments
for i in range(len(in_bytes)):
mock_data_received(helper, in_bytes[i : i + 1])
pkt = packets.pop()
type_, data = pkt
assert type_ == pkt_type
assert data == pkt_data
helper.close()
@pytest.mark.parametrize(
"byte_type",
(bytes, bytearray, memoryview),
)
def test_plaintext_frame_helper_protractor_event_loop(byte_type: Any) -> None:
"""Test the plaintext frame helper with the protractor event loop.
With the protractor event loop, data_received is called with a bytearray
instead of bytes.
https://github.com/esphome/issues/issues/5117
"""
for _ in range(3):
connection, packets = _make_mock_connection()
helper = APIPlaintextFrameHelper(
connection=connection, client_info="my client", log_name="test"
)
in_bytes = byte_type(
PREAMBLE + varuint_to_bytes(4) + varuint_to_bytes(100) + (b"\x42" * 4)
)
mock_data_received(helper, in_bytes)
pkt = packets.pop()
type_, data = pkt
assert type_ == 100
assert data == b"\x42" * 4
# Make sure we correctly handle fragments
for i in range(len(in_bytes)):
mock_data_received(helper, in_bytes[i : i + 1])
pkt = packets.pop()
type_, data = pkt
assert type_ == 100
assert data == b"\x42" * 4
@pytest.mark.asyncio
@pytest.mark.parametrize(
"byte_type",
(bytes, bytearray, memoryview),
)
async def test_noise_protector_event_loop(byte_type: Any) -> None:
"""Test the noise frame helper with the protractor event loop.
With the protractor event loop, data_received is called with a bytearray
instead of bytes.
https://github.com/esphome/issues/issues/5117
"""
outgoing_packets = [
"010000", # hello packet
"010031001ed7f7bb0b74085418258ed5928931bc36ade7cf06937fcff089044d4ab142643f1b2c9935bb77696f23d930836737a4",
]
incoming_packets = [
"01000d01736572766963657465737400",
"0100160148616e647368616b65204d4143206661696c757265",
]
connection, _ = _make_mock_connection()
helper = MockAPINoiseFrameHelper(
connection=connection,
noise_psk="QRTIErOb/fcE9Ukd/5qA3RGYMn0Y+p06U58SCtOXvPc=",
expected_name="servicetest",
client_info="my client",
log_name="test",
)
for pkt in outgoing_packets:
helper.mock_write_frame(byte_type(bytes.fromhex(pkt)))
for pkt in incoming_packets:
mock_data_received(helper, byte_type(bytes.fromhex(pkt)))
with pytest.raises(InvalidEncryptionKeyAPIError):
await helper.ready_future
@pytest.mark.asyncio
async def test_noise_frame_helper_incorrect_key():
"""Test that the noise frame helper raises InvalidEncryptionKeyAPIError on bad key."""
outgoing_packets = [
"010000", # hello packet
"010031001ed7f7bb0b74085418258ed5928931bc36ade7cf06937fcff089044d4ab142643f1b2c9935bb77696f23d930836737a4",
]
incoming_packets = [
"01000d01736572766963657465737400",
"0100160148616e647368616b65204d4143206661696c757265",
]
connection, _ = _make_mock_connection()
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helper = MockAPINoiseFrameHelper(
connection=connection,
noise_psk="QRTIErOb/fcE9Ukd/5qA3RGYMn0Y+p06U58SCtOXvPc=",
expected_name="servicetest",
client_info="my client",
log_name="test",
)
for pkt in outgoing_packets:
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helper.mock_write_frame(bytes.fromhex(pkt))
for pkt in incoming_packets:
mock_data_received(helper, bytes.fromhex(pkt))
with pytest.raises(InvalidEncryptionKeyAPIError):
await helper.ready_future
@pytest.mark.asyncio
async def test_noise_frame_helper_incorrect_key_fragments():
"""Test that the noise frame helper raises InvalidEncryptionKeyAPIError on bad key with fragmented packets."""
outgoing_packets = [
"010000", # hello packet
"010031001ed7f7bb0b74085418258ed5928931bc36ade7cf06937fcff089044d4ab142643f1b2c9935bb77696f23d930836737a4",
]
incoming_packets = [
"01000d01736572766963657465737400",
"0100160148616e647368616b65204d4143206661696c757265",
]
connection, _ = _make_mock_connection()
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helper = MockAPINoiseFrameHelper(
connection=connection,
noise_psk="QRTIErOb/fcE9Ukd/5qA3RGYMn0Y+p06U58SCtOXvPc=",
expected_name="servicetest",
client_info="my client",
log_name="test",
)
for pkt in outgoing_packets:
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helper.mock_write_frame(bytes.fromhex(pkt))
for pkt in incoming_packets:
in_pkt = bytes.fromhex(pkt)
for i in range(len(in_pkt)):
mock_data_received(helper, in_pkt[i : i + 1])
with pytest.raises(InvalidEncryptionKeyAPIError):
await helper.ready_future
@pytest.mark.asyncio
async def test_noise_incorrect_name():
"""Test we raise on bad name."""
outgoing_packets = [
"010000", # hello packet
"010031001ed7f7bb0b74085418258ed5928931bc36ade7cf06937fcff089044d4ab142643f1b2c9935bb77696f23d930836737a4",
]
incoming_packets = [
"01000d01736572766963657465737400",
"0100160148616e647368616b65204d4143206661696c757265",
]
connection, _ = _make_mock_connection()
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helper = MockAPINoiseFrameHelper(
connection=connection,
noise_psk="QRTIErOb/fcE9Ukd/5qA3RGYMn0Y+p06U58SCtOXvPc=",
expected_name="wrongname",
client_info="my client",
log_name="test",
)
for pkt in outgoing_packets:
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helper.mock_write_frame(bytes.fromhex(pkt))
for pkt in incoming_packets:
mock_data_received(helper, bytes.fromhex(pkt))
with pytest.raises(BadNameAPIError):
await helper.ready_future
VARUINT_TESTCASES = [
(0, b"\x00"),
(42, b"\x2a"),
(127, b"\x7f"),
(128, b"\x80\x01"),
(300, b"\xac\x02"),
(65536, b"\x80\x80\x04"),
]
@pytest.mark.parametrize("val, encoded", VARUINT_TESTCASES)
def test_varuint_to_bytes(val, encoded):
assert varuint_to_bytes(val) == encoded
assert cached_varuint_to_bytes(val) == encoded
@pytest.mark.asyncio
async def test_noise_frame_helper_handshake_failure():
"""Test the noise frame helper handshake failure."""
noise_psk = "QRTIErOb/fcE9Ukd/5qA3RGYMn0Y+p06U58SCtOXvPc="
psk_bytes = base64.b64decode(noise_psk)
writes = []
def _writer(data: bytes):
writes.append(data)
connection, _ = _make_mock_connection()
helper = MockAPINoiseFrameHelper(
connection=connection,
noise_psk=noise_psk,
expected_name="servicetest",
client_info="my client",
log_name="test",
writer=_writer,
)
proto = _mock_responder_proto(psk_bytes)
await asyncio.sleep(0) # let the task run to read the hello packet
assert len(writes) == 1
handshake_pkt = writes.pop()
encrypted_payload = _extract_encrypted_payload_from_handshake(handshake_pkt)
decrypted = proto.read_message(encrypted_payload)
assert decrypted == b""
hello_pkt_with_header = _make_noise_hello_pkt(b"\x01servicetest\0")
mock_data_received(helper, hello_pkt_with_header)
error_pkt = b"\x01forced to fail"
preamble = 1
error_pkg_length = len(error_pkt)
error_pkg_length_high = (error_pkg_length >> 8) & 0xFF
error_pkg_length_low = error_pkg_length & 0xFF
error_header = bytes((preamble, error_pkg_length_high, error_pkg_length_low))
error_pkt_with_header = error_header + error_pkt
mock_data_received(helper, error_pkt_with_header)
with pytest.raises(HandshakeAPIError, match="forced to fail"):
await helper.ready_future
@pytest.mark.asyncio
async def test_noise_frame_helper_handshake_success_with_single_packet():
"""Test the noise frame helper handshake success with a single packet."""
noise_psk = "QRTIErOb/fcE9Ukd/5qA3RGYMn0Y+p06U58SCtOXvPc="
psk_bytes = base64.b64decode(noise_psk)
writes = []
def _writer(data: bytes):
writes.append(data)
connection, packets = _make_mock_connection()
helper = MockAPINoiseFrameHelper(
connection=connection,
noise_psk=noise_psk,
expected_name="servicetest",
client_info="my client",
log_name="test",
writer=_writer,
)
proto = _mock_responder_proto(psk_bytes)
await asyncio.sleep(0) # let the task run to read the hello packet
assert len(writes) == 1
handshake_pkt = writes.pop()
encrypted_payload = _extract_encrypted_payload_from_handshake(handshake_pkt)
decrypted = proto.read_message(encrypted_payload)
assert decrypted == b""
hello_pkt_with_header = _make_noise_hello_pkt(b"\x01servicetest\0")
mock_data_received(helper, hello_pkt_with_header)
handshake_with_header = _make_noise_handshake_pkt(proto)
mock_data_received(helper, handshake_with_header)
assert not writes
await helper.ready_future
helper.write_packets([(1, b"to device")], True)
encrypted_packet = writes.pop()
header = encrypted_packet[0:1]
assert header == b"\x01"
pkg_length_high = encrypted_packet[1]
pkg_length_low = encrypted_packet[2]
pkg_length = (pkg_length_high << 8) + pkg_length_low
assert len(encrypted_packet) == 3 + pkg_length
encrypted_packet = _make_encrypted_packet(proto, 42, b"from device")
mock_data_received(helper, encrypted_packet)
assert packets == [(42, b"from device")]
helper.close()
mock_data_received(helper, encrypted_packet)
@pytest.mark.asyncio
async def test_noise_frame_helper_bad_encryption(
caplog: pytest.LogCaptureFixture,
) -> None:
"""Test the noise frame helper closes connection on encryption error."""
noise_psk = "QRTIErOb/fcE9Ukd/5qA3RGYMn0Y+p06U58SCtOXvPc="
psk_bytes = base64.b64decode(noise_psk)
writes = []
def _writer(data: bytes):
writes.append(data)
connection, packets = _make_mock_connection()
helper = MockAPINoiseFrameHelper(
connection=connection,
noise_psk=noise_psk,
expected_name="servicetest",
client_info="my client",
log_name="test",
writer=_writer,
)
proto = _mock_responder_proto(psk_bytes)
await asyncio.sleep(0) # let the task run to read the hello packet
assert len(writes) == 1
handshake_pkt = writes.pop()
encrypted_payload = _extract_encrypted_payload_from_handshake(handshake_pkt)
decrypted = proto.read_message(encrypted_payload)
assert decrypted == b""
hello_pkt_with_header = _make_noise_hello_pkt(b"\x01servicetest\0")
mock_data_received(helper, hello_pkt_with_header)
handshake_with_header = _make_noise_handshake_pkt(proto)
mock_data_received(helper, handshake_with_header)
assert not writes
await helper.ready_future
helper.write_packets([(1, b"to device")], True)
encrypted_packet = writes.pop()
header = encrypted_packet[0:1]
assert header == b"\x01"
pkg_length_high = encrypted_packet[1]
pkg_length_low = encrypted_packet[2]
pkg_length = (pkg_length_high << 8) + pkg_length_low
assert len(encrypted_packet) == 3 + pkg_length
encrypted_packet = _make_encrypted_packet_from_encrypted_payload(b"corrupt")
mock_data_received(helper, encrypted_packet)
await asyncio.sleep(0)
assert packets == []
assert connection.is_connected is False
assert "Invalid encryption key" in caplog.text
helper.close()
@pytest.mark.asyncio
async def test_init_plaintext_with_wrong_preamble(conn: APIConnection):
loop = asyncio.get_event_loop()
protocol = get_mock_protocol(conn)
with patch.object(loop, "create_connection") as create_connection:
create_connection.return_value = (MagicMock(), protocol)
conn._socket = MagicMock()
await conn._connect_init_frame_helper()
loop.call_soon(conn._frame_helper.ready_future.set_result, None)
conn.connection_state = ConnectionState.CONNECTED
task = asyncio.create_task(conn._connect_hello_login(login=True))
await asyncio.sleep(0)
# The preamble should be \x00 but we send \x09
mock_data_received(protocol, b"\x09\x00\x00")
with pytest.raises(ProtocolAPIError):
await task
@pytest.mark.asyncio
async def test_init_noise_with_wrong_byte_marker(noise_conn: APIConnection) -> None:
loop = asyncio.get_event_loop()
transport = MagicMock()
protocol: APINoiseFrameHelper | None = None
async def _create_connection(create, sock, *args, **kwargs):
nonlocal protocol
protocol = create()
protocol.connection_made(transport)
return transport, protocol
with patch.object(loop, "create_connection", side_effect=_create_connection):
task = asyncio.create_task(noise_conn._connect_init_frame_helper())
await asyncio.sleep(0)
assert protocol is not None
assert isinstance(noise_conn._frame_helper, APINoiseFrameHelper)
mock_data_received(protocol, b"\x00\x00\x00")
with pytest.raises(ProtocolAPIError, match="Marker byte invalid"):
await task
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@pytest.mark.asyncio
async def test_noise_frame_helper_empty_hello():
"""Test empty hello with noise."""
connection, _ = _make_mock_connection()
helper = MockAPINoiseFrameHelper(
connection=connection,
noise_psk="QRTIErOb/fcE9Ukd/5qA3RGYMn0Y+p06U58SCtOXvPc=",
expected_name="servicetest",
client_info="my client",
log_name="test",
)
hello_pkt_with_header = _make_noise_hello_pkt(b"")
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mock_data_received(helper, hello_pkt_with_header)
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with pytest.raises(HandshakeAPIError, match="ServerHello is empty"):
await helper.ready_future
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@pytest.mark.asyncio
async def test_noise_frame_helper_wrong_protocol():
"""Test noise with the wrong protocol."""
connection, _ = _make_mock_connection()
helper = MockAPINoiseFrameHelper(
connection=connection,
noise_psk="QRTIErOb/fcE9Ukd/5qA3RGYMn0Y+p06U58SCtOXvPc=",
expected_name="servicetest",
client_info="my client",
log_name="test",
)
# wrong protocol 5 instead of 1
hello_pkt_with_header = _make_noise_hello_pkt(b"\x05servicetest\0")
mock_data_received(helper, hello_pkt_with_header)
with pytest.raises(
HandshakeAPIError, match="Unknown protocol selected by client 5"
):
await helper.ready_future
@pytest.mark.asyncio
async def test_init_noise_attempted_when_esp_uses_plaintext(
noise_conn: APIConnection,
) -> None:
loop = asyncio.get_event_loop()
transport = MagicMock()
protocol: APINoiseFrameHelper | None = None
async def _create_connection(create, sock, *args, **kwargs):
nonlocal protocol
protocol = create()
protocol.connection_made(transport)
return transport, protocol
with patch.object(loop, "create_connection", side_effect=_create_connection):
task = asyncio.create_task(noise_conn._connect_init_frame_helper())
await asyncio.sleep(0)
assert isinstance(noise_conn._frame_helper, APINoiseFrameHelper)
protocol = noise_conn._frame_helper
protocol.connection_lost(ConnectionResetError())
with pytest.raises(
APIConnectionError, match="The connection dropped immediately"
):
await task
@pytest.mark.asyncio
async def test_eof_received_closes_connection(
plaintext_connect_task_with_login: tuple[
APIConnection, asyncio.Transport, APIPlaintextFrameHelper, asyncio.Task
],
) -> None:
conn, transport, protocol, connect_task = plaintext_connect_task_with_login
assert protocol.eof_received() is False
assert conn.is_connected is False
with pytest.raises(SocketClosedAPIError, match="EOF received"):
await connect_task
@pytest.mark.asyncio
async def test_connection_lost_closes_connection_and_logs(
caplog: pytest.LogCaptureFixture,
plaintext_connect_task_with_login: tuple[
APIConnection, asyncio.Transport, APIPlaintextFrameHelper, asyncio.Task
],
) -> None:
conn, transport, protocol, connect_task = plaintext_connect_task_with_login
protocol.connection_lost(OSError("original message"))
assert conn.is_connected is False
assert "original message" in caplog.text
with pytest.raises(APIConnectionError, match="original message"):
await connect_task
@pytest.mark.asyncio
@pytest.mark.parametrize(
("bad_psk", "error"),
(
("dGhpc2lzbm90MzJieXRlcw==", "expected 32-bytes of base64 data"),
("QRTIErOb/fcE9Ukd/5qA3RGYMn0Y+p06U58SCtOXvPc", "Malformed PSK"),
),
)
async def test_noise_bad_psks(bad_psk: str, error: str) -> None:
"""Test we raise on bad psks."""
connection, _ = _make_mock_connection()
with pytest.raises(InvalidEncryptionKeyAPIError, match=error):
MockAPINoiseFrameHelper(
connection=connection,
noise_psk=bad_psk,
expected_name="wrongname",
client_info="my client",
log_name="test",
)