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trezor-firmware/tests/device_tests/solana/construct/custom_constructs.py

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2023-10-18 10:07:14 +00:00
from construct import (
AdaptationError,
Adapter,
Byte,
Bytes,
Construct,
GreedyString,
If,
Int64ul,
Optional,
PaddedString,
Prefixed,
PrefixedArray,
Struct,
Validator,
VarInt,
this,
)
from trezorlib.tools import b58decode, b58encode
def _find_in_context(context, key: str):
if key in context:
return context[key]
elif context._ is not None:
return _find_in_context(context._, key)
else:
return None
class VersionEncodingAdapter(Adapter):
def _decode(self, obj: int, context, path) -> str | int:
if obj & 0x80:
return obj - 0x80
raise AdaptationError
def _encode(self, obj: int, context, path) -> int:
return obj | 0x80
Version = Optional(VersionEncodingAdapter(Byte))
class CompactU16Validator(Validator):
def _validate(self, obj: int, context, path) -> bool:
return obj < 0x1_0000
CompactU16 = CompactU16Validator(VarInt)
def CompactArray(subcon: Construct):
return PrefixedArray(CompactU16, subcon)
def CompactStruct(*subcons, **subconskw):
return Prefixed(CompactU16, Struct(*subcons, **subconskw))
class B58Adapter(Adapter):
def _decode(self, obj: str, context, path) -> str:
# decode/encode is flipped because we are deserializing ("decoding") by representing ("encoding") the bytes in Base58
return b58encode(obj)
def _encode(self, obj: str, context, path) -> bytes:
# decode/encode is flipped because we are serializing ("encoding") by parsing ("decoding") the Base58 string
return b58decode(obj)
PublicKey = B58Adapter(Bytes(32))
class HexStringAdapter(Adapter):
def _decode(self, obj: bytes, context, path) -> str:
return obj.hex()
def _encode(self, obj: str, context, path) -> bytes:
return bytes.fromhex(obj)
Memo = GreedyString("utf8")
String = Struct("length" / Int64ul, "chars" / PaddedString(this.length, "utf-8"))
def OptionalParameter(subcon: Construct):
return Struct(
"is_included" / Byte,
"value" / Optional(If(this.is_included == 1, subcon)),
)