forked from LBRYCommunity/lbry-sdk
298 lines
12 KiB
Python
298 lines
12 KiB
Python
import struct
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import hashlib
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from binascii import hexlify, unhexlify
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from typing import List, Optional
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import ecdsa
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from cryptography.hazmat.backends import default_backend
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from cryptography.hazmat.primitives.serialization import load_der_public_key
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from cryptography.hazmat.primitives import hashes
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from cryptography.hazmat.primitives.asymmetric import ec
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from cryptography.hazmat.primitives.asymmetric.utils import Prehashed
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from cryptography.exceptions import InvalidSignature
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from torba.client.basetransaction import BaseTransaction, BaseInput, BaseOutput, ReadOnlyList
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from torba.client.hash import hash160, sha256, Base58
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from lbrynet.schema.claim import Claim
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from lbrynet.schema.url import normalize_name
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from lbrynet.wallet.account import Account
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from lbrynet.wallet.script import InputScript, OutputScript
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class Input(BaseInput):
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script: InputScript
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script_class = InputScript
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class Output(BaseOutput):
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script: OutputScript
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script_class = OutputScript
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__slots__ = 'channel', 'private_key', 'meta'
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def __init__(self, *args, channel: Optional['Output'] = None,
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private_key: Optional[str] = None, **kwargs) -> None:
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super().__init__(*args, **kwargs)
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self.channel = channel
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self.private_key = private_key
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self.meta = {}
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def update_annotations(self, annotated):
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super().update_annotations(annotated)
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self.channel = annotated.channel if annotated else None
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self.private_key = annotated.private_key if annotated else None
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def get_fee(self, ledger):
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name_fee = 0
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if self.script.is_claim_name:
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name_fee = len(self.script.values['claim_name']) * ledger.fee_per_name_char
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return max(name_fee, super().get_fee(ledger))
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@property
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def is_claim(self) -> bool:
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return self.script.is_claim_name or self.script.is_update_claim
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@property
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def is_support(self) -> bool:
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return self.script.is_support_claim
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@property
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def claim_hash(self) -> bytes:
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if self.script.is_claim_name:
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return hash160(self.tx_ref.hash + struct.pack('>I', self.position))
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elif self.script.is_update_claim or self.script.is_support_claim:
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return self.script.values['claim_id']
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else:
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raise ValueError('No claim_id associated.')
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@property
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def claim_id(self) -> str:
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return hexlify(self.claim_hash[::-1]).decode()
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@property
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def claim_name(self) -> str:
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if self.script.is_claim_involved:
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return self.script.values['claim_name'].decode()
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raise ValueError('No claim_name associated.')
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@property
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def normalized_name(self) -> str:
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return normalize_name(self.claim_name)
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@property
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def claim(self) -> Claim:
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if self.is_claim:
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if not isinstance(self.script.values['claim'], Claim):
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self.script.values['claim'] = Claim.from_bytes(self.script.values['claim'])
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return self.script.values['claim']
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raise ValueError('Only claim name and claim update have the claim payload.')
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@property
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def permanent_url(self) -> str:
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if self.script.is_claim_involved:
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return f"lbry://{self.claim_name}#{self.claim_id}"
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raise ValueError('No claim associated.')
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@property
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def has_private_key(self):
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return self.private_key is not None
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def get_signature_digest(self, ledger):
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if self.claim.unsigned_payload:
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pieces = [
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Base58.decode(self.get_address(ledger)),
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self.claim.unsigned_payload,
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self.claim.signing_channel_hash[::-1]
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]
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else:
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pieces = [
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self.tx_ref.tx.inputs[0].txo_ref.hash,
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self.claim.signing_channel_hash,
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self.claim.to_message_bytes()
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]
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return sha256(b''.join(pieces))
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def get_encoded_signature(self):
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signature = hexlify(self.claim.signature)
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r = int(signature[:int(len(signature)/2)], 16)
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s = int(signature[int(len(signature)/2):], 16)
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return ecdsa.util.sigencode_der(r, s, len(signature)*4)
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@staticmethod
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def is_signature_valid(encoded_signature, signature_digest, public_key_bytes):
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try:
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public_key = load_der_public_key(public_key_bytes, default_backend())
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public_key.verify(encoded_signature, signature_digest, ec.ECDSA(Prehashed(hashes.SHA256())))
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return True
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except (ValueError, InvalidSignature):
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pass
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return False
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def is_signed_by(self, channel: 'Output', ledger=None):
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return self.is_signature_valid(
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self.get_encoded_signature(),
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self.get_signature_digest(ledger),
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channel.claim.channel.public_key_bytes
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)
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def sign(self, channel: 'Output', first_input_id=None):
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self.channel = channel
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self.claim.signing_channel_hash = channel.claim_hash
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digest = sha256(b''.join([
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first_input_id or self.tx_ref.tx.inputs[0].txo_ref.hash,
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self.claim.signing_channel_hash,
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self.claim.to_message_bytes()
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]))
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private_key = ecdsa.SigningKey.from_pem(channel.private_key, hashfunc=hashlib.sha256)
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self.claim.signature = private_key.sign_digest_deterministic(digest, hashfunc=hashlib.sha256)
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self.script.generate()
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def clear_signature(self):
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self.channel = None
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self.claim.clear_signature()
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def generate_channel_private_key(self):
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private_key = ecdsa.SigningKey.generate(curve=ecdsa.SECP256k1, hashfunc=hashlib.sha256)
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self.private_key = private_key.to_pem().decode()
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self.claim.channel.public_key_bytes = private_key.get_verifying_key().to_der()
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self.script.generate()
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return self.private_key
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def is_channel_private_key(self, private_key_pem):
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private_key = ecdsa.SigningKey.from_pem(private_key_pem, hashfunc=hashlib.sha256)
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return self.claim.channel.public_key_bytes == private_key.get_verifying_key().to_der()
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@classmethod
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def pay_claim_name_pubkey_hash(
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cls, amount: int, claim_name: str, claim: Claim, pubkey_hash: bytes) -> 'Output':
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script = cls.script_class.pay_claim_name_pubkey_hash(
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claim_name.encode(), claim, pubkey_hash)
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txo = cls(amount, script)
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return txo
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@classmethod
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def pay_update_claim_pubkey_hash(
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cls, amount: int, claim_name: str, claim_id: str, claim: Claim, pubkey_hash: bytes) -> 'Output':
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script = cls.script_class.pay_update_claim_pubkey_hash(
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claim_name.encode(), unhexlify(claim_id)[::-1], claim, pubkey_hash)
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txo = cls(amount, script)
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return txo
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@classmethod
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def pay_support_pubkey_hash(cls, amount: int, claim_name: str, claim_id: str, pubkey_hash: bytes) -> 'Output':
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script = cls.script_class.pay_support_pubkey_hash(claim_name.encode(), unhexlify(claim_id)[::-1], pubkey_hash)
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return cls(amount, script)
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@classmethod
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def purchase_claim_pubkey_hash(cls, amount: int, claim_id: str, pubkey_hash: bytes) -> 'Output':
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script = cls.script_class.purchase_claim_pubkey_hash(unhexlify(claim_id)[::-1], pubkey_hash)
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return cls(amount, script)
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class Transaction(BaseTransaction):
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input_class = Input
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output_class = Output
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outputs: ReadOnlyList[Output]
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inputs: ReadOnlyList[Input]
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@classmethod
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def pay(cls, amount: int, address: bytes, funding_accounts: List[Account], change_account: Account):
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ledger = cls.ensure_all_have_same_ledger(funding_accounts, change_account)
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output = Output.pay_pubkey_hash(amount, ledger.address_to_hash160(address))
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return cls.create([], [output], funding_accounts, change_account)
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@classmethod
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def claim_create(
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cls, name: str, claim: Claim, amount: int, holding_address: str,
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funding_accounts: List[Account], change_account: Account, signing_channel: Output = None):
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ledger = cls.ensure_all_have_same_ledger(funding_accounts, change_account)
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claim_output = Output.pay_claim_name_pubkey_hash(
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amount, name, claim, ledger.address_to_hash160(holding_address)
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)
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if signing_channel is not None:
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claim_output.sign(signing_channel, b'placeholder txid:nout')
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return cls.create([], [claim_output], funding_accounts, change_account, sign=False)
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@classmethod
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def claim_update(
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cls, previous_claim: Output, claim: Claim, amount: int, holding_address: str,
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funding_accounts: List[Account], change_account: Account, signing_channel: Output = None):
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ledger = cls.ensure_all_have_same_ledger(funding_accounts, change_account)
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updated_claim = Output.pay_update_claim_pubkey_hash(
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amount, previous_claim.claim_name, previous_claim.claim_id,
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claim, ledger.address_to_hash160(holding_address)
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)
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if signing_channel is not None:
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updated_claim.sign(signing_channel, b'placeholder txid:nout')
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else:
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updated_claim.clear_signature()
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return cls.create(
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[Input.spend(previous_claim)], [updated_claim], funding_accounts, change_account, sign=False
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)
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@classmethod
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def support(cls, claim_name: str, claim_id: str, amount: int, holding_address: str,
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funding_accounts: List[Account], change_account: Account):
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ledger = cls.ensure_all_have_same_ledger(funding_accounts, change_account)
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support_output = Output.pay_support_pubkey_hash(
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amount, claim_name, claim_id, ledger.address_to_hash160(holding_address)
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)
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return cls.create([], [support_output], funding_accounts, change_account)
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@classmethod
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def purchase(cls, claim: Output, amount: int, merchant_address: bytes,
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funding_accounts: List[Account], change_account: Account):
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ledger = cls.ensure_all_have_same_ledger(funding_accounts, change_account)
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claim_output = Output.purchase_claim_pubkey_hash(
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amount, claim.claim_id, ledger.address_to_hash160(merchant_address)
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)
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return cls.create([], [claim_output], funding_accounts, change_account)
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@property
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def my_inputs(self):
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for txi in self.inputs:
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if txi.txo_ref.txo is not None and txi.txo_ref.txo.is_my_account:
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yield txi
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def _filter_my_outputs(self, f):
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for txo in self.outputs:
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if txo.is_my_account and f(txo.script):
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yield txo
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def _filter_other_outputs(self, f):
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for txo in self.outputs:
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if not txo.is_my_account and f(txo.script):
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yield txo
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@property
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def my_claim_outputs(self):
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return self._filter_my_outputs(lambda s: s.is_claim_name)
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@property
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def my_update_outputs(self):
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return self._filter_my_outputs(lambda s: s.is_update_claim)
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@property
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def my_support_outputs(self):
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return self._filter_my_outputs(lambda s: s.is_support_claim)
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@property
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def other_support_outputs(self):
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return self._filter_other_outputs(lambda s: s.is_support_claim)
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@property
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def my_abandon_outputs(self):
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for txi in self.inputs:
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abandon = txi.txo_ref.txo
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if abandon is not None and abandon.is_my_account and abandon.script.is_claim_involved:
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is_update = False
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if abandon.script.is_claim_name or abandon.script.is_update_claim:
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for update in self.my_update_outputs:
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if abandon.claim_id == update.claim_id:
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is_update = True
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break
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if not is_update:
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yield abandon
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