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trezor-firmware/python/tests/test_protobuf_encoding.py

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# This file is part of the Trezor project.
#
# Copyright (C) 2012-2022 SatoshiLabs and contributors
#
# This library is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License version 3
# as published by the Free Software Foundation.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the License along with this library.
# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
import logging
from enum import IntEnum
from io import BytesIO
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import pytest
from trezorlib import protobuf
class SomeEnum(IntEnum):
Zero = 0
Five = 5
TwentyFive = 25
class WiderEnum(IntEnum):
One = 1
Two = 2
Three = 3
Four = 4
Five = 5
class NarrowerEnum(IntEnum):
One = 1
Five = 5
class PrimitiveMessage(protobuf.MessageType):
FIELDS = {
1: protobuf.Field("uvarint", "uint64"),
2: protobuf.Field("svarint", "sint64"),
3: protobuf.Field("bool", "bool"),
4: protobuf.Field("bytes", "bytes"),
5: protobuf.Field("unicode", "string"),
6: protobuf.Field("enum", "SomeEnum"),
}
class EnumMessageMoreValues(protobuf.MessageType):
FIELDS = {1: protobuf.Field("enum", "WiderEnum")}
class EnumMessageLessValues(protobuf.MessageType):
FIELDS = {1: protobuf.Field("enum", "NarrowerEnum")}
class RepeatedFields(protobuf.MessageType):
FIELDS = {
1: protobuf.Field("uintlist", "uint64", repeated=True),
2: protobuf.Field("enumlist", "SomeEnum", repeated=True),
3: protobuf.Field("strlist", "string", repeated=True),
}
class RequiredFields(protobuf.MessageType):
FIELDS = {
1: protobuf.Field("uvarint", "uint64", required=True),
2: protobuf.Field("nested", "PrimitiveMessage", required=True),
}
class DefaultFields(protobuf.MessageType):
FIELDS = {
1: protobuf.Field("uvarint", "uint32", default=42),
2: protobuf.Field("svarint", "sint32", default=-42),
3: protobuf.Field("bool", "bool", default=True),
4: protobuf.Field("bytes", "bytes", default=b"hello"),
5: protobuf.Field("unicode", "string", default="hello"),
6: protobuf.Field("enum", "SomeEnum", default=SomeEnum.Five),
}
class RecursiveMessage(protobuf.MessageType):
FIELDS = {
1: protobuf.Field("uvarint", "uint64"),
2: protobuf.Field("recursivefield", "RecursiveMessage", required=False),
}
def load_uvarint(buffer):
reader = BytesIO(buffer)
return protobuf.load_uvarint(reader)
def dump_uvarint(value):
writer = BytesIO()
protobuf.dump_uvarint(writer, value)
return writer.getvalue()
def load_message(buffer, msg_type):
reader = BytesIO(buffer)
return protobuf.load_message(reader, msg_type)
def dump_message(msg):
writer = BytesIO()
protobuf.dump_message(writer, msg)
return writer.getvalue()
def test_dump_uvarint():
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assert dump_uvarint(0) == b"\x00"
assert dump_uvarint(1) == b"\x01"
assert dump_uvarint(0xFF) == b"\xff\x01"
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assert dump_uvarint(123456) == b"\xc0\xc4\x07"
with pytest.raises(ValueError):
dump_uvarint(-1)
def test_load_uvarint():
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assert load_uvarint(b"\x00") == 0
assert load_uvarint(b"\x01") == 1
assert load_uvarint(b"\xff\x01") == 0xFF
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assert load_uvarint(b"\xc0\xc4\x07") == 123456
assert load_uvarint(b"\x80\x80\x80\x80\x00") == 0
def test_broken_uvarint():
with pytest.raises(IOError):
load_uvarint(b"\x80\x80")
def test_sint_uint():
"""
Protobuf interleaved signed encoding
https://developers.google.com/protocol-buffers/docs/encoding#structure
LSbit is sign, rest is shifted absolute value.
Or, by example, you count like so: 0, -1, 1, -2, 2, -3 ...
"""
assert protobuf.sint_to_uint(0) == 0
assert protobuf.uint_to_sint(0) == 0
assert protobuf.sint_to_uint(-1) == 1
assert protobuf.sint_to_uint(1) == 2
assert protobuf.uint_to_sint(1) == -1
assert protobuf.uint_to_sint(2) == 1
# roundtrip:
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assert protobuf.uint_to_sint(protobuf.sint_to_uint(1234567891011)) == 1234567891011
assert protobuf.uint_to_sint(protobuf.sint_to_uint(-(2**32))) == -(2**32)
def test_simple_message():
msg = PrimitiveMessage(
uvarint=12345678910,
svarint=-12345678910,
bool=True,
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bytes=b"\xDE\xAD\xCA\xFE",
unicode="Příliš žluťoučký kůň úpěl ďábelské ódy 😊",
enum=SomeEnum.Five,
)
buf = dump_message(msg)
retr = load_message(buf, PrimitiveMessage)
assert msg == retr
assert retr.uvarint == 12345678910
assert retr.svarint == -12345678910
assert retr.bool is True
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assert retr.bytes == b"\xDE\xAD\xCA\xFE"
assert retr.unicode == "Příliš žluťoučký kůň úpěl ďábelské ódy 😊"
assert retr.enum == SomeEnum.Five
assert retr.enum == 5
def test_validate_enum(caplog):
caplog.set_level(logging.INFO)
# round-trip of a valid value
msg = EnumMessageMoreValues(enum=WiderEnum.Five)
buf = dump_message(msg)
retr = load_message(buf, EnumMessageLessValues)
assert retr.enum == msg.enum
assert not caplog.records
# dumping an invalid enum value fails
msg.enum = 19
with pytest.raises(
ValueError, match="Value 19 in field enum unknown for WiderEnum"
):
dump_message(msg)
msg.enum = WiderEnum.Three
buf = dump_message(msg)
retr = load_message(buf, EnumMessageLessValues)
assert len(caplog.records) == 1
record = caplog.records.pop(0)
assert record.levelname == "INFO"
assert record.getMessage() == "On field enum: 3 is not a valid NarrowerEnum"
assert retr.enum == 3
def test_repeated():
msg = RepeatedFields(
uintlist=[1, 2, 3], enumlist=[0, 5, 0, 5], strlist=["hello", "world"]
)
buf = dump_message(msg)
retr = load_message(buf, RepeatedFields)
assert retr == msg
def test_packed():
values = [4, 44, 444]
packed_values = b"".join(dump_uvarint(v) for v in values)
field_id = 1 << 3 | 2 # field number 1, wire type 2
field_len = len(packed_values)
message_bytes = dump_uvarint(field_id) + dump_uvarint(field_len) + packed_values
msg = load_message(message_bytes, RepeatedFields)
assert msg
assert msg.uintlist == values
assert not msg.enumlist
assert not msg.strlist
def test_packed_enum():
values = [0, 0, 0, 0]
packed_values = b"".join(dump_uvarint(v) for v in values)
field_id = 2 << 3 | 2 # field number 2, wire type 2
field_len = len(packed_values)
message_bytes = dump_uvarint(field_id) + dump_uvarint(field_len) + packed_values
msg = load_message(message_bytes, RepeatedFields)
assert msg
assert msg.enumlist == values
assert not msg.uintlist
assert not msg.strlist
def test_required():
msg = RequiredFields(uvarint=3, nested=PrimitiveMessage())
buf = dump_message(msg)
msg_ok = load_message(buf, RequiredFields)
assert msg_ok == msg
with pytest.deprecated_call():
msg = RequiredFields(uvarint=3)
with pytest.raises(ValueError):
# cannot encode instance without the required fields
dump_message(msg)
msg = RequiredFields(uvarint=3, nested=None)
# we can always encode an invalid message
buf = dump_message(msg)
with pytest.raises(ValueError):
# required field `nested` is also not sent
load_message(buf, RequiredFields)
msg = RequiredFields(uvarint=None, nested=PrimitiveMessage())
buf = dump_message(msg)
with pytest.raises(ValueError):
# required field `uvarint` is not sent
load_message(buf, RequiredFields)
def test_default():
# load empty message
retr = load_message(b"", DefaultFields)
assert retr.uvarint == 42
assert retr.svarint == -42
assert retr.bool is True
assert retr.bytes == b"hello"
assert retr.unicode == "hello"
assert retr.enum == SomeEnum.Five
msg = DefaultFields(uvarint=0)
buf = dump_message(msg)
retr = load_message(buf, DefaultFields)
assert retr.uvarint == 0
msg = DefaultFields(uvarint=None)
buf = dump_message(msg)
retr = load_message(buf, DefaultFields)
assert retr.uvarint == 42
def test_recursive():
msg = RecursiveMessage(
uvarint=1,
recursivefield=RecursiveMessage(
uvarint=2, recursivefield=RecursiveMessage(uvarint=3)
),
)
buf = dump_message(msg)
retr = load_message(buf, RecursiveMessage)
assert msg == retr
assert retr.uvarint == 1
assert type(retr.recursivefield) is RecursiveMessage
assert retr.recursivefield.uvarint == 2
assert type(retr.recursivefield.recursivefield) is RecursiveMessage
assert retr.recursivefield.recursivefield.uvarint == 3