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269 lines
10 KiB
Python
269 lines
10 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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import types
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import json
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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-log")
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def serialize_int( int_field, numbytes ):
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"""
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Serialize an integer to a hex string that is padlen characters long.
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Raise an exception on overflow.
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"""
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if int_field >= 2**(numbytes*8) or int_field < -(2**(numbytes*8)):
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raise Exception("Integer overflow (%s bytes)" % (numbytes) )
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format_str = "%%0.%sx" % (numbytes*2)
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hex_str = format_str % int_field
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if len(hex_str) % 2 != 0:
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# sometimes python cuts off the leading zero
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hex_str = '0' + hex_str
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return hex_str
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def serialize_buckets( bucket_exponents ):
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"""
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Serialize the list of bucket exponents.
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There should be 16 buckets, and each one should have an integer between 0 and 15.
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"""
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ret = ""
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for i in xrange(0, len(bucket_exponents)):
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ret += "%X" % bucket_exponents[i]
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return ret
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def serialize_discounts( nonalpha_discount, no_vowel_discount ):
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"""
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Serialize the non-alpha and no-vowel discounts.
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They must be between 0 and 15
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"""
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return "%X%X" % (nonalpha_discount, no_vowel_discount)
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def namespacereveal_sanity_check( namespace_id, version, lifetime, coeff, base, bucket_exponents, nonalpha_discount, no_vowel_discount ):
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"""
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Verify the validity of a namespace reveal.
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Return True if valid
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Raise an Exception if not valid.
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"""
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# sanity check
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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 ID '%s' has non-base-38 characters" % namespace_id)
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if len(namespace_id) > LENGTH_MAX_NAMESPACE_ID:
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raise Exception("Invalid namespace ID length for '%s' (expected length between 1 and %s)" % (namespace_id, LENGTH_MAX_NAMESPACE_ID))
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if lifetime < 0 or lifetime > (2**32 - 1):
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lifetime = NAMESPACE_LIFE_INFINITE
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if coeff < 0 or coeff > 255:
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raise Exception("Invalid cost multiplier %s: must be in range [0, 256)" % coeff)
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if base < 0 or base > 255:
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raise Exception("Invalid base price %s: must be in range [0, 256)" % base)
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if len(bucket_exponents) != 16:
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raise Exception("Exactly 16 buckets required")
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for i in xrange(0, len(bucket_exponents)):
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if bucket_exponents[i] < 0 or bucket_exponents[i] > 15:
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raise Exception("Invalid bucket exponent %s (must be in range [0, 16)" % bucket_exponents[i])
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if nonalpha_discount <= 0 or nonalpha_discount > 15:
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raise Exception("Invalid non-alpha discount %s: must be in range [0, 16)" % nonalpha_discount)
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if no_vowel_discount <= 0 or no_vowel_discount > 15:
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raise Exception("Invalid no-vowel discount %s: must be in range [0, 16)" % no_vowel_discount)
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return True
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# version: 2 bytes
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# namespace ID: up to 19 bytes
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def build( namespace_id, version, reveal_addr, lifetime, coeff, base, bucket_exponents, nonalpha_discount, no_vowel_discount ):
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"""
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Record to mark the beginning of a namespace import in the blockchain.
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This reveals the namespace ID, and encodes the preorder's namespace rules.
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The rules for a namespace are as follows:
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* a name can fall into one of 16 buckets, measured by length. Bucket 16 incorporates all names at least 16 characters long.
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* the pricing structure applies a multiplicative penalty for having numeric characters, or punctuation characters.
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* the price of a name in a bucket is ((coeff) * (base) ^ (bucket exponent)) / ((numeric discount multiplier) * (punctuation discount multiplier))
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Example:
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base = 10
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coeff = 2
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nonalpha discount: 10
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no-vowel discount: 10
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buckets 1, 2: 9
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buckets 3, 4, 5, 6: 8
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buckets 7, 8, 9, 10, 11, 12, 13, 14: 7
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buckets 15, 16+:
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The price of "john" would be 2 * 10^8, since "john" falls into bucket 4 and has no punctuation or numerics.
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The price of "john1" would be 2 * 10^6, since "john1" falls into bucket 5 but has a number (and thus receives a 10x discount)
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The price of "john_1" would be 2 * 10^6, since "john_1" falls into bucket 6 but has a number and puncuation (and thus receives a 10x discount)
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The price of "j0hn_1" would be 2 * 10^5, since "j0hn_1" falls into bucket 6 but has a number and punctuation and lacks vowels (and thus receives a 100x discount)
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Namespace ID must be base38.
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Format:
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0 2 3 7 8 9 10 11 12 13 14 15 16 17 18 20 39
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|-----|---|--------|-----|-----|----|----|----|----|----|-----|-----|-----|--------|----------|-------------------------|
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magic op life coeff. base 1-2 3-4 5-6 7-8 9-10 11-12 13-14 15-16 nonalpha version namespace ID
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bucket exponents no-vowel
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discounts
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"""
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rc = namespacereveal_sanity_check( namespace_id, version, lifetime, coeff, base, bucket_exponents, nonalpha_discount, no_vowel_discount )
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if not rc:
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raise Exception("Invalid namespace parameters")
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# good to go!
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life_hex = serialize_int( lifetime, 4 )
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coeff_hex = serialize_int( coeff, 1 )
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base_hex = serialize_int( base, 1 )
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bucket_hex = serialize_buckets( bucket_exponents )
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discount_hex = serialize_discounts( nonalpha_discount, no_vowel_discount )
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version_hex = serialize_int( version, 2 )
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namespace_id_hex = hexlify( namespace_id )
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readable_script = "NAMESPACE_REVEAL 0x%s 0x%s 0x%s 0x%s 0x%s 0x%s 0x%s" % (life_hex, coeff_hex, base_hex, bucket_hex, discount_hex, version_hex, namespace_id_hex)
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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, reveal_addr, change_addr, tx_fee):
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"""
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Make outputs for a register:
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[0] OP_RETURN with the name
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[1] pay-to-address with the *reveal_addr*, not the sender's address.
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[2] change address with the NAMESPACE_PREORDER sender's address
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Raise ValueError if there are not enough inputs to make the transaction
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"""
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total_to_send = DEFAULT_OP_RETURN_FEE + DEFAULT_DUST_FEE
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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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# register address
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{"script_hex": virtualchain.make_payment_script(reveal_addr),
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"value": DEFAULT_DUST_FEE},
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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, total_to_send, DEFAULT_DUST_FEE * (len(inputs) + 3)) + tx_fee},
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]
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def make_transaction( namespace_id, reveal_addr, lifetime, coeff, base_cost, bucket_exponents, nonalpha_discount, no_vowel_discount, 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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reveal_addr address to own this namespace until it is ready
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lifetime: the number of blocks for which names will be valid (pass a negative value for "infinite")
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coeff: cost multipler
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base_cost: the base cost (i.e. cost of a 1-character name), in satoshis
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bucket_exponents: bucket cost exponents to which to raise the base cost
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nonalpha_discount: discount multipler for non-alpha-character names
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no_vowel_discount: discount multipler for no-vowel names
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"""
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namespace_id = str(namespace_id)
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reveal_addr = str(reveal_addr)
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lifetime = int(lifetime)
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coeff = int(coeff)
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base_cost = int(base_cost)
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nonalpha_discount = int(nonalpha_discount)
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no_vowel_discount = int(no_vowel_discount)
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preorder_addr = str(preorder_addr)
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tx_fee = int(tx_fee)
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assert pybitcoin.b58check_version_byte( preorder_addr ) == virtualchain.version_byte, "Only p2pkh reveal addresses are supported"
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bexp = []
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for be in bucket_exponents:
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bexp.append(int(be))
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bucket_exponents = bexp
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assert is_namespace_valid(namespace_id)
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nulldata = build( namespace_id, BLOCKSTACK_VERSION, reveal_addr, lifetime, coeff, base_cost, bucket_exponents, nonalpha_discount, no_vowel_discount )
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# get inputs and from public key
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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, reveal_addr, preorder_addr, 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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