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https://github.com/alexgo-io/stacks-puppet-node.git
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247 lines
7.7 KiB
Python
247 lines
7.7 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 ..b40 import *
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from ..config import *
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from ..hashing import *
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from ..scripts import *
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from ..nameset import *
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from binascii import hexlify, unhexlify
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import virtualchain
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log = virtualchain.get_logger("blockstack-server")
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# consensus hash fields (ORDER MATTERS!)
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FIELDS = NAMEREC_FIELDS[:] + [
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'name_consensus_hash', # hash(name,consensus_hash)
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'consensus_hash' # consensus hash when this update was sent
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]
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# fields this operation mutates
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MUTATE_FIELDS = NAMEREC_MUTATE_FIELDS[:] + [
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'value_hash',
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'consensus_hash'
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]
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# fields that will not be written to the database, but are canonical
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UNSTORED_CANONICAL_FIELDS = [
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'name_consensus_hash'
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]
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def update_sanity_test( name, consensus_hash, data_hash ):
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"""
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Verify the validity of an update's data
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Return True if valid
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Raise exception if not
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"""
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if name is not None and (not is_b40( name ) or "+" in name or name.count(".") > 1):
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raise Exception("Name '%s' has non-base-38 characters" % name)
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if data_hash is not None and not is_hex( data_hash ):
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raise Exception("Invalid hex string '%s': not hex" % (data_hash))
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if len(data_hash) != 2 * LENGTHS['value_hash']:
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raise Exception("Invalid hex string '%s': bad length" % (data_hash))
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return True
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@state_transition("name", "name_records")
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def check(state_engine, nameop, block_id, checked_ops ):
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"""
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Verify the validity of an update to a name's associated data.
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Use the nameop's 128-bit name hash to find the name itself.
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NAME_UPDATE isn't allowed during an import, so the name's namespace must be ready.
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Return True if accepted
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Return False if not.
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"""
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name_consensus_hash = nameop['name_consensus_hash']
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sender = nameop['sender']
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# deny updates if we exceed quota--the only legal operations are to revoke or transfer.
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sender_names = state_engine.get_names_owned_by_sender( sender )
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if len(sender_names) > MAX_NAMES_PER_SENDER:
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log.debug("Sender '%s' has exceeded quota: only transfers or revokes are allowed" % (sender))
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return False
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name, consensus_hash = state_engine.get_name_from_name_consensus_hash( name_consensus_hash, sender, block_id )
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# name must exist
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if name is None or consensus_hash is None:
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log.debug("Unable to resolve name consensus hash '%s' to a name owned by '%s'" % (name_consensus_hash, sender))
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# nothing to do--write is stale or on a fork
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return False
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namespace_id = get_namespace_from_name( name )
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name_rec = state_engine.get_name( name )
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if name_rec is None:
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log.debug("Name '%s' does not exist" % name)
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return False
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# namespace must be ready
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if not state_engine.is_namespace_ready( namespace_id ):
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# non-existent namespace
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log.debug("Namespace '%s' is not ready" % (namespace_id))
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return False
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# name must not be revoked
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if state_engine.is_name_revoked( name ):
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log.debug("Name '%s' is revoked" % name)
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return False
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# name must not be expired as of the *last block processed*
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if state_engine.is_name_expired( name, state_engine.lastblock ):
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log.debug("Name '%s' is expired" % name)
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return False
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# name must not be in grace period in *this* block
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if state_engine.is_name_in_grace_period(name, block_id):
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log.debug("Name '{}' is in the renewal grace period. It can only be renewed at this time.".format(name))
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return False
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# the name must be registered
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if not state_engine.is_name_registered( name ):
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# doesn't exist
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log.debug("Name '%s' is not registered" % name )
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return False
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# the name must be owned by the same person who sent this nameop
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if not state_engine.is_name_owner( name, sender ):
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# wrong owner
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log.debug("Name '%s' is not owned by '%s'" % (name, sender))
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return False
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# remember the name and consensus hash, so we don't have to re-calculate it...
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nameop['name'] = name
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nameop['consensus_hash'] = consensus_hash
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nameop['sender_pubkey'] = name_rec['sender_pubkey']
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# not stored, but re-calculateable
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del nameop['name_consensus_hash']
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return True
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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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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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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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"vtxindex": vtxindex,
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"txid": txid,
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"op": NAME_UPDATE
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}
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ret.update( parsed_payload )
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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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return ret
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def parse(bin_payload):
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"""
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Parse a payload to get back the name and update hash.
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NOTE: bin_payload excludes the leading three bytes.
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"""
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if len(bin_payload) != LENGTHS['name_consensus_hash'] + LENGTHS['value_hash']:
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log.error("Invalid update length %s" % len(bin_payload))
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return None
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name_consensus_hash_bin = bin_payload[:LENGTHS['name_consensus_hash']]
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value_hash_bin = bin_payload[LENGTHS['name_consensus_hash']:]
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name_consensus_hash = hexlify( name_consensus_hash_bin )
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value_hash = hexlify( value_hash_bin )
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try:
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rc = update_sanity_test( None, name_consensus_hash, value_hash )
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if not rc:
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raise Exception("Invalid update data")
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except Exception, e:
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log.error("Invalid update data")
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return None
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return {
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'opcode': 'NAME_UPDATE',
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'name_consensus_hash': name_consensus_hash,
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'value_hash': value_hash
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}
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def canonicalize(parsed_op):
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"""
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Get the canonical representation of this operation
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"""
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parsed_op['name_consensus_hash'] = hash256_trunc128(str(parsed_op['name']) + str(parsed_op['consensus_hash']))
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return parsed_op
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