Contract con_lamden_link_bsc_v1
| Creator | af872ff0f3b00f4161418e9429e738cf8a228c686680233929782de94f46bd70 |
| Creation Hash | 7f4305c08785ee24c327dc7617308c92fa439e8ff7f3686554f5de008ecc8140 |
| Created On | 922 days ago - 10/15/2021, 8:46:47 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('mint', 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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# LST002
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metadata = Hash()
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@construct
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def seed():
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# LST002
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metadata['operator'] = ctx.caller
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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 ctx.caller == metadata['operator'], 'Only operator can set metadata!'
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metadata[key] = value
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def left_pad(s: str):
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while len(s) < 64:
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s = f'0{s}'
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if len(s) > 64:
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s = s[:64]
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return s
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def unpack_uint256(uint: str, decimals: int):
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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: float, decimals: int):
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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: str):
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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: int):
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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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@export
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def mint(ethereum_contract: str, amount: str, lamden_wallet: str):
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assert ctx.caller == metadata['operator'], 'Only operator can call! Current caller is {}, operator should be {}'.format(ctx.caller, metadata['operator'])
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assert supported_tokens[ethereum_contract] is not None, 'Invalid BSC Token!'
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decimals = supported_tokens[ethereum_contract, 'decimals']
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assert decimals is not None, 'Unexpected decimal error'
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unpacked_amount = unpack_uint256(amount, decimals)
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token = I.import_module(supported_tokens[ethereum_contract])
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assert I.enforce_interface(token, token_interface), 'Invalid token interface!'
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token.mint(amount=unpacked_amount, to=lamden_wallet)
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@export
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def burn(ethereum_contract: str, ethereum_address: str, amount: float):
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assert supported_tokens[ethereum_contract] is not None, 'Invalid BSC Token!'
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token = I.import_module(supported_tokens[ethereum_contract])
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assert I.enforce_interface(token, token_interface), 'Invalid token interface!'
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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, supported_tokens[ethereum_contract, '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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nonces[ethereum_address] += 1
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abi = packed_token + packed_amount + packed_nonce + packed_address
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return abi
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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 supported_tokens[ethereum_contract] is None, 'Token already supported'
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assert ctx.caller == metadata['operator'], 'Only operator can call!'
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token = I.import_module(lamden_contract)
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assert I.enforce_interface(token, token_interface), 'Invalid token interface!'
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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 post_proof(hashed_abi: str, signed_abi: str):
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assert ctx.caller == metadata['operator'], 'Only operator can call!'
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proofs[hashed_abi] = signed_abi
Byte Code
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