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https://github.com/alexgo-io/stacks-puppet-node.git
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170 lines
6.1 KiB
Python
170 lines
6.1 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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Blockstack-client
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~~~~~
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copyright: (c) 2014-2015 by Halfmoon Labs, Inc.
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copyright: (c) 2016 by Blockstack.org
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This file is part of Blockstack-client.
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Blockstack-client is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Blockstack-client is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Blockstack-client. If not, see <http://www.gnu.org/licenses/>.
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"""
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import pybitcoin
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from pybitcoin import embed_data_in_blockchain, serialize_transaction, \
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serialize_sign_and_broadcast, make_op_return_script, \
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make_pay_to_address_script, hex_hash160
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from pybitcoin.transactions.outputs import calculate_change_amount
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from utilitybelt import is_hex
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from binascii import hexlify, unhexlify
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from ..b40 import b40_to_hex, bin_to_b40, is_b40
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from ..config import *
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from ..scripts import *
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import virtualchain
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log = virtualchain.get_logger("blockstack-client")
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def build( namespace_id, script_pubkey, register_addr, consensus_hash, namespace_id_hash=None):
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"""
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Preorder a namespace with the given consensus hash. This records that someone has begun to create
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a namespace, while blinding all other peers to its ID. This operation additionally records the
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consensus hash in order to ensure that all peers will recognize that this sender has begun the creation.
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Takes an ASCII-encoded namespace ID.
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NOTE: "namespace_id" must not start with ., but can contain anything else we want
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We put the hash of the namespace ID instead of the namespace ID itself to avoid races with squatters (akin to pre-ordering)
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Format:
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0 2 3 23 39
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|-----|---|--------------------------------------|----------------|
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magic op hash(ns_id,script_pubkey,reveal_addr) consensus hash
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"""
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# sanity check
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if namespace_id_hash is None:
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# expect inputs to the hash...
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if not is_b40( namespace_id ) or "+" in namespace_id or namespace_id.count(".") > 0:
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raise Exception("Namespace identifier '%s' has non-base-38 characters" % namespace_id)
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if len(namespace_id) == 0 or len(namespace_id) > LENGTH_MAX_NAMESPACE_ID:
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raise Exception("Invalid namespace ID length '%s (expected length between 1 and %s)" % (namespace_id, LENGTH_MAX_NAMESPACE_ID))
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# NOTE: dup of the above checks
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if not is_namespace_valid(namespace_id):
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raise Exception("Invalid namespace ID")
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namespace_id_hash = hash_name(namespace_id, script_pubkey, register_addr=register_addr)
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readable_script = "NAMESPACE_PREORDER 0x%s 0x%s" % (namespace_id_hash, consensus_hash)
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hex_script = blockstack_script_to_hex(readable_script)
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packaged_script = add_magic_bytes(hex_script)
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return packaged_script
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def make_outputs( data, inputs, change_addr, fee, tx_fee, pay_fee=True ):
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"""
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Make outputs for a namespace preorder:
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[0] OP_RETURN with the name
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[1] change address with the NAME_PREORDER sender's address
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[2] pay-to-address with the *burn address* with the fee
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Raise ValueError if there are not enough inputs to make the transaction
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"""
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dust_fee = DEFAULT_OP_RETURN_FEE + (len(inputs) + 2) * DEFAULT_DUST_FEE + tx_fee
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op_fee = max(fee, DEFAULT_DUST_FEE)
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dust_value = DEFAULT_DUST_FEE
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bill = op_fee
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if not pay_fee:
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# subsidized
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dust_fee = 0
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op_fee = 0
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dust_value = 0
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bill = 0
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return [
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# main output
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{"script_hex": make_op_return_script(str(data), format='hex'),
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"value": 0},
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# change address
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{"script_hex": virtualchain.make_payment_script( change_addr ),
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"value": calculate_change_amount(inputs, bill, dust_fee)},
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# burn address
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{"script_hex": virtualchain.make_payment_script(BLOCKSTACK_BURN_ADDRESS),
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"value": op_fee}
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]
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def make_transaction( namespace_id, register_addr, fee, consensus_hash, preorder_addr, blockchain_client, tx_fee=0, safety=True ):
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"""
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Propagate a namespace.
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Arguments:
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namespace_id human-readable (i.e. base-40) name of the namespace
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register_addr the addr of the key that will reveal the namespace (mixed into the preorder to prevent name preimage attack races). Must be a p2pkh address
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private_key the Bitcoin address that created this namespace, and can populate it.
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"""
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namespace_id = str(namespace_id)
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register_addr = str(register_addr)
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fee = int(fee)
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consensus_hash = str(consensus_hash)
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preorder_addr = str(preorder_addr)
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tx_fee = int(tx_fee)
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assert is_namespace_valid(namespace_id)
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assert len(consensus_hash) == LENGTH_CONSENSUS_HASH * 2
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assert pybitcoin.b58check_version_byte( preorder_addr ) == virtualchain.version_byte, "Only p2pkh reveal addresses are supported"
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script_pubkey = virtualchain.make_payment_script( preorder_addr )
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nulldata = build( namespace_id, script_pubkey, register_addr, consensus_hash )
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# get inputs and from address
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inputs = tx_get_unspents( preorder_addr, blockchain_client )
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if safety:
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assert len(inputs) > 0
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# build custom outputs here
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outputs = make_outputs(nulldata, inputs, preorder_addr, fee, tx_fee )
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return (inputs, outputs)
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def get_fees( inputs, outputs ):
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"""
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Blockstack currently does not allow
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the subsidization of namespaces.
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"""
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return (None, None)
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def snv_consensus_extras( name_rec, block_id, blockchain_name_data ):
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"""
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Calculate any derived missing data that goes into the check() operation,
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given the block number, the name record at the block number, and the db.
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"""
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return {}
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