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https://github.com/alexgo-io/stacks-puppet-node.git
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222 lines
6.9 KiB
Python
222 lines
6.9 KiB
Python
#!/usr/bin/env python2
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# -*- coding: utf-8 -*-
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"""
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Blockstack
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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
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Blockstack 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 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. If not, see <http://www.gnu.org/licenses/>.
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"""
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from ..config import *
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from ..scripts import *
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from ..hashing import *
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from ..nameset import *
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import json
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from binascii import hexlify, unhexlify
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# consensus hash fields (ORDER MATTERS!)
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FIELDS = [
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'preorder_hash', # hash(namespace_id,sender,reveal_addr)
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'consensus_hash', # consensus hash at the time issued
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'op', # bytecode describing the operation (not necessarily 1 byte)
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'op_fee', # fee paid for the namespace to the burn address
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'txid', # transaction ID
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'vtxindex', # the index in the block where the tx occurs
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'block_number', # block number at which this transaction occurred
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'sender', # scriptPubKey hex from the principal that issued this preorder (identifies the preorderer)
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'sender_pubkey', # if sender is a p2pkh script, this is the public key
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'address' # address from the scriptPubKey
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]
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# save everything
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MUTATE_FIELDS = FIELDS[:]
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@state_preorder("check_preorder_collision")
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def check( state_engine, nameop, block_id, checked_ops ):
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"""
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Given a NAMESPACE_PREORDER nameop, see if we can preorder it.
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It must be unqiue.
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Return True if accepted.
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Return False if not.
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"""
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namespace_id_hash = nameop['preorder_hash']
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consensus_hash = nameop['consensus_hash']
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# cannot be preordered already
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if not state_engine.is_new_namespace_preorder( namespace_id_hash ):
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log.debug("Namespace preorder '%s' already in use" % namespace_id_hash)
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return False
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# has to have a reasonable consensus hash
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if not state_engine.is_consensus_hash_valid( block_id, consensus_hash ):
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valid_consensus_hashes = state_engine.get_valid_consensus_hashes( block_id )
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log.debug("Invalid consensus hash '%s': expected any of %s" % (consensus_hash, ",".join( valid_consensus_hashes )) )
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return False
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# has to have paid a fee
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if not 'op_fee' in nameop:
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log.debug("Missing namespace preorder fee")
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return False
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return True
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def get_namespace_preorder_burn_info( outputs ):
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"""
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Given the set of outputs, find the fee sent
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to our burn address.
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Return the fee and burn address on success as {'op_fee': ..., 'burn_address': ...}
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Return None if not found
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"""
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if len(outputs) < 3:
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# not a well-formed preorder
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return None
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op_fee = outputs[2]['value']
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burn_address = None
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try:
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burn_address = virtualchain.script_hex_to_address(outputs[2]['script'])
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assert burn_address
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except:
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log.error("Invalid burn script: {}".format(outputs[2]['script']))
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return None
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return {'op_fee': op_fee, 'burn_address': burn_address}
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def tx_extract( payload, senders, inputs, outputs, block_id, vtxindex, txid ):
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"""
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Extract and return a dict of fields from the underlying blockchain transaction data
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that are useful to this operation.
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Required (+ parse):
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sender: the script_pubkey (as a hex string) of the principal that sent the name preorder transaction
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address: the address from the sender script
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Optional:
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sender_pubkey_hex: the public key of the sender
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"""
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sender_script = None
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sender_address = None
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sender_pubkey_hex = None
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burn_info = None
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try:
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# by construction, the first input comes from the principal
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# who sent the registration transaction...
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assert len(senders) > 0
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assert 'script_pubkey' in senders[0].keys()
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assert 'addresses' in senders[0].keys()
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sender_script = str(senders[0]['script_pubkey'])
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sender_address = str(senders[0]['addresses'][0])
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assert sender_script is not None
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assert sender_address is not None
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if str(senders[0]['script_type']) == 'pubkeyhash':
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sender_pubkey_hex = get_public_key_hex_from_tx( inputs, sender_address )
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burn_info = get_namespace_preorder_burn_info(outputs)
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assert burn_info
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except Exception, e:
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log.exception(e)
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raise Exception("Failed to extract")
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parsed_payload = parse( payload )
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assert parsed_payload is not None
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ret = {
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"sender": sender_script,
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"address": sender_address,
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"block_number": block_id,
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"vtxindex": vtxindex,
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"txid": txid,
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"op": NAMESPACE_PREORDER
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}
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ret.update( parsed_payload )
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ret.update( burn_info )
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if sender_pubkey_hex is not None:
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ret['sender_pubkey'] = sender_pubkey_hex
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else:
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ret['sender_pubkey'] = None
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return ret
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def parse( bin_payload ):
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"""
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NOTE: the first three bytes will be missing
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"""
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if len(bin_payload) != LENGTHS['preorder_name_hash'] + LENGTHS['consensus_hash']:
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log.error("Invalid namespace preorder payload length %s" % len(bin_payload))
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return None
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namespace_id_hash = bin_payload[ :LENGTHS['preorder_name_hash'] ]
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consensus_hash = bin_payload[ LENGTHS['preorder_name_hash']: LENGTHS['preorder_name_hash'] + LENGTHS['consensus_hash'] ]
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namespace_id_hash = hexlify( namespace_id_hash )
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consensus_hash = hexlify( consensus_hash )
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return {
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'opcode': 'NAMESPACE_PREORDER',
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'preorder_hash': namespace_id_hash,
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'consensus_hash': consensus_hash
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}
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def canonicalize(parsed_op):
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"""
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Get the "canonical form" of this operation, putting it into a form where it can be serialized
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to form a consensus hash. This method is meant to preserve compatibility across blockstackd releases.
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For all namespace operations, this means:
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* make the 'buckets' array into a string
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"""
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if 'buckets' in parsed_op:
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parsed_op['buckets'] = str(parsed_op['buckets'])
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return parsed_op
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def decanonicalize(canonical_op):
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"""
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Get the "current form" of this operation, putting it into a form usable by the rest of the system.
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For namespace ops, this means:
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* make 'buckets' string into an array, if it is present
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"""
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if 'buckets' in canonical_op:
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canonical_op['buckets'] = json.loads(canonical_op['buckets'])
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return canonical_op
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