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https://github.com/alexgo-io/stacks-puppet-node.git
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223 lines
6.5 KiB
Python
223 lines
6.5 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 ..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 blockstack_client
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from blockstack_client.operations import *
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# consensus hash fields (ORDER MATTERS!)
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FIELDS = NAMEREC_FIELDS[:]
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# fields that this operation changes
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MUTATE_FIELDS = NAMEREC_MUTATE_FIELDS[:] + [
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'revoked',
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'value_hash'
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]
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# fields to back up when applying this operation
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BACKUP_FIELDS = NAMEREC_NAME_BACKUP_FIELDS[:] + MUTATE_FIELDS[:] + [
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'consensus_hash'
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]
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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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Revoke a name--make it available for registration.
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* it must be well-formed
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* its namespace must be ready.
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* the name must be registered
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* it must be sent by the name owner
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NAME_REVOKE 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 = nameop['name']
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sender = nameop['sender']
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namespace_id = get_namespace_from_name( name )
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# name must be well-formed
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if not is_b40( name ) or "+" in name or name.count(".") > 1:
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log.debug("Malformed name '%s': non-base-38 characters" % name)
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return False
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# name must exist
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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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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 *this* block
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if state_engine.is_name_expired( name, block_id ):
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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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log.debug("Name '%s' is not registered" % name )
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return False
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# the sender must own this name
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if not state_engine.is_name_owner( name, sender ):
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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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# apply state transition
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nameop['revoked'] = True
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nameop['value_hash'] = None
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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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"txid": txid,
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"vtxindex": vtxindex,
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"op": NAME_REVOKE
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}
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ret.update( parsed_payload )
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"""
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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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"""
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return ret
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def parse(bin_payload):
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"""
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Interpret a block's nulldata back into a name. The first three bytes (2 magic + 1 opcode)
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will not be present in bin_payload.
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The name will be directly represented by the bytes given.
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"""
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fqn = bin_payload
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if not is_name_valid( fqn ):
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return None
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return {
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'opcode': 'NAME_REVOKE',
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'name': fqn
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}
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def restore_delta( name_rec, block_number, history_index, working_db, untrusted_db ):
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"""
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Find the fields in a name record that were changed by an instance of this operation, at the
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given (block_number, history_index) point in time in the past. The history_index is the
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index into the list of changes for this name record in the given block.
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Return the fields that were modified on success.
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Return None on error.
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"""
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from ..nameset import BlockstackDB
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name_rec_script = build_revoke( str(name_rec['name']) )
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name_rec_payload = unhexlify( name_rec_script )[3:]
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ret_op = parse( name_rec_payload )
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return ret_op
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def snv_consensus_extras( name_rec, block_id, blockchain_name_data, db ):
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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 blockstack_client.operations.revoke.snv_consensus_extras( name_rec, block_id, blockchain_name_data )
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'''
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ret_op = {}
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return ret_op
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'''
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