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import json
import re
from typing import Union
from hexbytes import HexBytes
from eth_utils import hexstr_if_str, to_hex, big_endian_to_int, int_to_big_endian
from tronapi.base.abi import (
size_of_type,
sub_type_of_array_type,
is_array_type,
is_bool_type,
is_uint_type,
is_int_type,
is_address_type,
is_bytes_type,
is_string_type,
)
from tronapi.base.validation import validate_abi_type, validate_abi_value
from tronapi.utils.hexadecimal import (
remove_0x_prefix,
decode_hex,
encode_hex,
add_0x_prefix,
)
from tronapi.base.toolz import curry
from tronapi.utils.types import is_boolean, is_integer, is_list_like, is_bytes
from tronapi.base.datastructures import AttributeDict
from tronapi.utils.validation import assert_one_val
def hex_encode_abi_type(abi_type, value, force_size=None):
"""
Encodes value into a hex string in format of abi_type
"""
validate_abi_type(abi_type)
validate_abi_value(abi_type, value)
data_size = force_size or size_of_type(abi_type)
if is_array_type(abi_type):
sub_type = sub_type_of_array_type(abi_type)
return "".join(
[remove_0x_prefix(hex_encode_abi_type(sub_type, v, 256)) for v in value]
)
elif is_bool_type(abi_type):
return to_hex_with_size(value, data_size)
elif is_uint_type(abi_type):
return to_hex_with_size(value, data_size)
elif is_int_type(abi_type):
return to_hex_twos_compliment(value, data_size)
elif is_address_type(abi_type):
return pad_hex(value, data_size)
elif is_bytes_type(abi_type):
if is_bytes(value):
return encode_hex(value)
else:
return value
elif is_string_type(abi_type):
return to_hex(text=value)
else:
raise ValueError("Unsupported ABI type: {0}".format(abi_type))
def to_hex_twos_compliment(value, bit_size):
"""
Converts integer value to twos compliment hex representation with given bit_size
"""
if value >= 0:
return to_hex_with_size(value, bit_size)
value = (1 << bit_size) + value
hex_value = hex(value)
hex_value = hex_value.rstrip("L")
return hex_value
def to_hex_with_size(value, bit_size):
"""Converts a value to hex with given bit_size:"""
return pad_hex(to_hex(value), bit_size)
def pad_hex(value, bit_size):
"""Pads a hex string up to the given bit_size"""
value = remove_0x_prefix(value)
return add_0x_prefix(value.zfill(int(bit_size / 4)))
def trim_hex(hexstr):
if hexstr.startswith("0x0"):
hexstr = re.sub("^0x0+", "0x", hexstr)
if hexstr == "0x":
hexstr = "0x0"
return hexstr
def to_int(value=None, hexstr=None, text=None):
"""Converts value to it's integer representation.
Values are converted this way:
* value:
* bytes: big-endian integer
* bool: True => 1, False => 0
* hexstr: interpret hex as integer
* text: interpret as string of digits, like '12' => 12
"""
assert_one_val(value, hexstr=hexstr, text=text)
if hexstr is not None:
return int(hexstr, 16)
elif text is not None:
return int(text)
elif isinstance(value, bytes):
return big_endian_to_int(value)
elif isinstance(value, str):
raise TypeError("Pass in strings with keyword hexstr or text")
else:
return int(value)
@curry
def text_if_str(to_type, text_or_primitive):
"""
Convert to a type, assuming that strings can be only unicode text (not a hexstr)
"""
if isinstance(text_or_primitive, str):
(primitive, text) = (None, text_or_primitive)
else:
(primitive, text) = (text_or_primitive, None)
return to_type(primitive, text=text)
def to_text(primitive=None, hexstr=None, text=None):
assert_one_val(primitive, hexstr=hexstr, text=text)
if hexstr is not None:
return to_bytes(hexstr=hexstr).decode("utf-8")
elif text is not None:
return text
elif isinstance(primitive, str):
return to_text(hexstr=primitive)
elif isinstance(primitive, bytes):
return primitive.decode("utf-8")
elif is_integer(primitive):
byte_encoding = int_to_big_endian(primitive)
return to_text(byte_encoding)
raise TypeError("Expected an int, bytes or hexstr.")
def to_bytes(primitive=None, hexstr=None, text=None):
assert_one_val(primitive, hexstr=hexstr, text=text)
if is_boolean(primitive):
return b"\x01" if primitive else b"\x00"
elif isinstance(primitive, bytes):
return primitive
elif is_integer(primitive):
return to_bytes(hexstr=to_hex(primitive))
elif hexstr is not None:
if len(hexstr) % 2:
hexstr = "0x0" + remove_0x_prefix(hexstr)
return decode_hex(hexstr)
elif text is not None:
return text.encode("utf-8")
raise TypeError("expected an int in first arg, or keyword of hexstr or text")
def to_4byte_hex(hex_or_str_or_bytes: Union[int, str, bytes]) -> str:
size_of_4bytes = 4 * 8
byte_str = hexstr_if_str(to_bytes, hex_or_str_or_bytes)
if len(byte_str) > 4:
raise ValueError(
"expected value of size 4 bytes. Got: %d bytes" % len(byte_str)
)
hex_str = encode_hex(byte_str)
return pad_hex(hex_str, size_of_4bytes)
class FriendlyJsonSerialize:
"""
Friendly JSON serializer & deserializer
When encoding or decoding fails, this class collects
information on which fields failed, to show more
helpful information in the raised error messages.
"""
def _json_mapping_errors(self, mapping):
for key, val in mapping.items():
try:
self._friendly_json_encode(val)
except TypeError as exc:
yield "%r: because (%s)" % (key, exc)
def _json_list_errors(self, iterable):
for index, element in enumerate(iterable):
try:
self._friendly_json_encode(element)
except TypeError as exc:
yield "%d: because (%s)" % (index, exc)
def _friendly_json_encode(self, obj, cls=None):
try:
encoded = json.dumps(obj, cls=cls)
return encoded
except TypeError as full_exception:
if hasattr(obj, "items"):
item_errors = "; ".join(self._json_mapping_errors(obj))
raise TypeError(
"dict had unencodable value at keys: {{{}}}".format(item_errors)
)
elif is_list_like(obj):
element_errors = "; ".join(self._json_list_errors(obj))
raise TypeError(
"list had unencodable value at index: [{}]".format(element_errors)
)
else:
raise full_exception
@staticmethod
def json_decode(json_str):
try:
decoded = json.loads(json_str)
return decoded
except json.decoder.JSONDecodeError as exc:
err_msg = "Could not decode {} because of {}.".format(repr(json_str), exc)
# Calling code may rely on catching JSONDecodeError to recognize bad json
# so we have to re-raise the same type.
raise json.decoder.JSONDecodeError(err_msg, exc.doc, exc.pos)
def json_encode(self, obj, cls=None):
try:
return self._friendly_json_encode(obj, cls=cls)
except TypeError as exc:
raise TypeError("Could not encode to JSON: {}".format(exc))
class TronJsonEncoder(json.JSONEncoder):
def default(self, obj):
if isinstance(obj, AttributeDict):
return {k: v for k, v in obj.items()}
if isinstance(obj, HexBytes):
return obj.hex()
return json.JSONEncoder.default(self, obj)
def to_json(obj: object) -> object:
"""Convert a complex object (like a transaction object) to a JSON string"""
return FriendlyJsonSerialize().json_encode(obj, cls=TronJsonEncoder)