forked from LBRYCommunity/lbry-sdk
126 lines
4.6 KiB
Python
126 lines
4.6 KiB
Python
import struct
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from torba.server.enum import Enumeration
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from lbrynet.wallet.server.model import NameClaim, ClaimSupport, ClaimUpdate
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# TODO: Take this to lbryschema (it's also on lbryum and lbryum-server)
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opcodes = Enumeration("Opcodes", [
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("OP_0", 0), ("OP_PUSHDATA1", 76), "OP_PUSHDATA2", "OP_PUSHDATA4", "OP_1NEGATE", "OP_RESERVED",
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"OP_1", "OP_2", "OP_3", "OP_4", "OP_5", "OP_6", "OP_7",
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"OP_8", "OP_9", "OP_10", "OP_11", "OP_12", "OP_13", "OP_14", "OP_15", "OP_16",
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"OP_NOP", "OP_VER", "OP_IF", "OP_NOTIF", "OP_VERIF", "OP_VERNOTIF", "OP_ELSE", "OP_ENDIF",
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"OP_VERIFY",
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"OP_RETURN", "OP_TOALTSTACK", "OP_FROMALTSTACK", "OP_2DROP", "OP_2DUP", "OP_3DUP", "OP_2OVER",
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"OP_2ROT", "OP_2SWAP",
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"OP_IFDUP", "OP_DEPTH", "OP_DROP", "OP_DUP", "OP_NIP", "OP_OVER", "OP_PICK", "OP_ROLL",
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"OP_ROT",
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"OP_SWAP", "OP_TUCK", "OP_CAT", "OP_SUBSTR", "OP_LEFT", "OP_RIGHT", "OP_SIZE", "OP_INVERT",
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"OP_AND",
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"OP_OR", "OP_XOR", "OP_EQUAL", "OP_EQUALVERIFY", "OP_RESERVED1", "OP_RESERVED2", "OP_1ADD",
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"OP_1SUB", "OP_2MUL",
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"OP_2DIV", "OP_NEGATE", "OP_ABS", "OP_NOT", "OP_0NOTEQUAL", "OP_ADD", "OP_SUB", "OP_MUL",
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"OP_DIV",
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"OP_MOD", "OP_LSHIFT", "OP_RSHIFT", "OP_BOOLAND", "OP_BOOLOR",
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"OP_NUMEQUAL", "OP_NUMEQUALVERIFY", "OP_NUMNOTEQUAL", "OP_LESSTHAN",
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"OP_GREATERTHAN", "OP_LESSTHANOREQUAL", "OP_GREATERTHANOREQUAL", "OP_MIN", "OP_MAX",
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"OP_WITHIN", "OP_RIPEMD160", "OP_SHA1", "OP_SHA256", "OP_HASH160",
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"OP_HASH256", "OP_CODESEPARATOR", "OP_CHECKSIG", "OP_CHECKSIGVERIFY", "OP_CHECKMULTISIG",
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"OP_CHECKMULTISIGVERIFY", "OP_NOP1", "OP_NOP2", "OP_NOP3", "OP_NOP4", "OP_NOP5",
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"OP_CLAIM_NAME",
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"OP_SUPPORT_CLAIM", "OP_UPDATE_CLAIM",
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("OP_SINGLEBYTE_END", 0xF0),
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("OP_DOUBLEBYTE_BEGIN", 0xF000),
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"OP_PUBKEY", "OP_PUBKEYHASH",
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("OP_INVALIDOPCODE", 0xFFFF),
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])
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def script_GetOp(bytes):
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i = 0
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while i < len(bytes):
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vch = None
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opcode = bytes[i]
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i += 1
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if opcode <= opcodes.OP_PUSHDATA4:
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nSize = opcode
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if opcode == opcodes.OP_PUSHDATA1:
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nSize = bytes[i]
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i += 1
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elif opcode == opcodes.OP_PUSHDATA2:
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(nSize,) = struct.unpack_from('<H', bytes, i)
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i += 2
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elif opcode == opcodes.OP_PUSHDATA4:
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(nSize,) = struct.unpack_from('<I', bytes, i)
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i += 4
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if i + nSize > len(bytes):
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vch = "_INVALID_" + bytes[i:]
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i = len(bytes)
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else:
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vch = bytes[i:i + nSize]
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i += nSize
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yield (opcode, vch, i)
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def decode_claim_script(bytes_script):
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try:
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decoded_script = [x for x in script_GetOp(bytes_script)]
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except Exception as e:
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print(e)
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return None
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if len(decoded_script) <= 6:
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return False
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op = 0
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claim_type = decoded_script[op][0]
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if claim_type == opcodes.OP_UPDATE_CLAIM:
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if len(decoded_script) <= 7:
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return False
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if claim_type not in [
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opcodes.OP_CLAIM_NAME,
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opcodes.OP_SUPPORT_CLAIM,
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opcodes.OP_UPDATE_CLAIM
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]:
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return False
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op += 1
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value = None
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claim_id = None
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claim = None
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if not 0 <= decoded_script[op][0] <= opcodes.OP_PUSHDATA4:
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return False
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name = decoded_script[op][1]
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op += 1
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if not 0 <= decoded_script[op][0] <= opcodes.OP_PUSHDATA4:
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return False
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if decoded_script[0][0] in [
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opcodes.OP_SUPPORT_CLAIM,
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opcodes.OP_UPDATE_CLAIM
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]:
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claim_id = decoded_script[op][1]
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if len(claim_id) != 20:
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return False
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else:
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value = decoded_script[op][1]
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op += 1
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if decoded_script[0][0] == opcodes.OP_UPDATE_CLAIM:
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value = decoded_script[op][1]
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op += 1
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if decoded_script[op][0] != opcodes.OP_2DROP:
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return False
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op += 1
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if decoded_script[op][0] != opcodes.OP_DROP and decoded_script[0][0] == opcodes.OP_CLAIM_NAME:
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return False
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elif decoded_script[op][0] != opcodes.OP_2DROP and decoded_script[0][0] == opcodes.OP_UPDATE_CLAIM:
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return False
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op += 1
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if decoded_script[0][0] == opcodes.OP_CLAIM_NAME:
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if name is None or value is None:
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return False
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claim = NameClaim(name, value)
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elif decoded_script[0][0] == opcodes.OP_UPDATE_CLAIM:
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if name is None or value is None or claim_id is None:
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return False
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claim = ClaimUpdate(name, claim_id, value)
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elif decoded_script[0][0] == opcodes.OP_SUPPORT_CLAIM:
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if name is None or claim_id is None:
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return False
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claim = ClaimSupport(name, claim_id)
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return claim, decoded_script[op:]
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