Contract con_lamden_native_tokens_bridge_to_bsc_v1
| Creator | af872ff0f3b00f4161418e9429e738cf8a228c686680233929782de94f46bd70 |
| Creation Hash | 93e7e03335652fd9ac38165c613ac62b9bf52b57be04eaf57d183fca677c5c99 |
| Created On | 500 days ago - 12/13/2022, 5:44:01 PM UTC+0 |
Contract Code
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I = importlib
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# Enforceable interface
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token_interface = [
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I.Func("transfer", args=("amount", "to")),
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I.Func("approve", args=("amount", "to")),
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I.Func("transfer_from", args=("amount", "to", "main_account"))
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]
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supported_tokens = Hash()
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nonces = Hash(default_value=0)
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proofs = Hash()
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metadata = Hash()
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bridge_address = Variable()
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HEX_BYTES = 64
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def left_pad(s):
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while len(s) < HEX_BYTES:
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s = f"0{s}"
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if len(s) > HEX_BYTES:
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s = s[:HEX_BYTES]
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return s
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def unpack_uint256(uint, decimals):
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i = int(uint, 16)
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reduced_i = i / (10 ** decimals)
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return reduced_i
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def pack_amount(amount, decimals):
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i = int(amount * (10 ** decimals))
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h = hex(i)[2:]
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return left_pad(h)
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def pack_eth_address(address):
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assert address.startswith("0x"), "Invalid Ethereum prefix"
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a = address[2:]
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assert len(a) == 40, "Invalid address length"
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int(a, 16) # Throws error if not hex string
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return left_pad(a)
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def pack_int(i):
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i = int(i)
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h = hex(i)[2:]
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return left_pad(h)
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@construct
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def seed():
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metadata["operator"] = ctx.caller
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def assert_operator():
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assert ctx.caller == metadata["operator"], "Only the operator can call!"
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def assert_token_is_supported(ethereum_contract: str):
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assert supported_tokens[ethereum_contract], "Token Not Supported"
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def assert_valid_token_interface(token: Any):
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assert I.enforce_interface(token, token_interface), "Invalid Token Interface!"
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def assert_token_decimals_are_int(decimals: Any):
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assert isinstance(decimals, int), "Decimal Not Type Integer"
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# LST002
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@export
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def change_metadata(key: str, value: Any):
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assert_operator()
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metadata[key] = value
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@export
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def set_bridge(ethereum_contract: str):
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assert_operator()
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bridge_address.set(ethereum_contract)
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@export
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def add_token(ethereum_contract: str, lamden_contract: str, decimals: int):
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assert_operator()
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assert not supported_tokens[ethereum_contract], "Token already supported"
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token = I.import_module(lamden_contract)
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assert_valid_token_interface(token)
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supported_tokens[ethereum_contract] = lamden_contract
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supported_tokens[ethereum_contract, "decimals"] = decimals
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@export
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def remove_token(ethereum_contract: str):
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assert_operator()
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supported_tokens[ethereum_contract] = False
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@export
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def post_proof(hashed_abi: str, signed_abi: str):
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assert_operator()
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proofs[hashed_abi] = signed_abi
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@export
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def proofs(hashed_abi: str):
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return proofs[hashed_abi]
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@export
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def set_nonce(ethereum_address: str, nonce: int):
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assert_operator()
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nonces[ethereum_address] = nonce
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@export
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def deposit(ethereum_contract: str, amount: float, ethereum_address: str):
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assert_token_is_supported(ethereum_contract=ethereum_contract)
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token = I.import_module(supported_tokens[ethereum_contract])
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assert_valid_token_interface(token)
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decimals = supported_tokens[ethereum_contract, "decimals"]
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assert_token_decimals_are_int(decimals)
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token.transfer_from(amount=amount, to=ctx.this, main_account=ctx.caller)
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packed_token = pack_eth_address(ethereum_contract)
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packed_amount = pack_amount(amount, decimals)
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packed_nonce = pack_int(nonces[ethereum_address] + 1)
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packed_address = pack_eth_address(ethereum_address)
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packed_bridge = pack_eth_address(bridge_address.get())
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nonces[ethereum_address] += 1
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abi = packed_token + packed_amount + packed_nonce + packed_address + packed_bridge
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return abi
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@export
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def withdraw(ethereum_contract: str, amount: float, to: str):
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assert_operator()
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assert_token_is_supported(ethereum_contract=ethereum_contract)
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token = I.import_module(supported_tokens[ethereum_contract])
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token.transfer(amount=amount, to=to)
Byte Code
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