lib/transaction.py

   1 #!/usr/bin/env python
   2 #
   3 # Electrum - lightweight Bitcoin client
   4 # Copyright (C) 2011 thomasv@gitorious
   5 #
   6 # This program is free software: you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation, either version 3 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
  18
  19
  20 # Note: The deserialization code originally comes from ABE.
  21
  22
  23 from bitcoin import *
  24 from util import print_error
  25 import time
  26 import struct
  27
  28 #
  29 # Workalike python implementation of Bitcoin's CDataStream class.
  30 #
  31 import struct
  32 import StringIO
  33 import mmap
  34
  35 class SerializationError(Exception):
  36     """ Thrown when there's a problem deserializing or serializing """
  37
  38 class BCDataStream(object):
  39     def __init__(self):
  40         self.input = None
  41         self.read_cursor = 0
  42
  43     def clear(self):
  44         self.input = None
  45         self.read_cursor = 0
  46
  47     def write(self, bytes):  # Initialize with string of bytes
  48         if self.input is None:
  49             self.input = bytes
  50         else:
  51             self.input += bytes
  52
  53     def map_file(self, file, start):  # Initialize with bytes from file
  54         self.input = mmap.mmap(file.fileno(), 0, access=mmap.ACCESS_READ)
  55         self.read_cursor = start
  56
  57     def seek_file(self, position):
  58         self.read_cursor = position
  59
  60     def close_file(self):
  61         self.input.close()
  62
  63     def read_string(self):
  64         # Strings are encoded depending on length:
  65         # 0 to 252 :  1-byte-length followed by bytes (if any)
  66         # 253 to 65,535 : byte'253' 2-byte-length followed by bytes
  67         # 65,536 to 4,294,967,295 : byte '254' 4-byte-length followed by bytes
  68         # ... and the Bitcoin client is coded to understand:
  69         # greater than 4,294,967,295 : byte '255' 8-byte-length followed by bytes of string
  70         # ... but I don't think it actually handles any strings that big.
  71         if self.input is None:
  72             raise SerializationError("call write(bytes) before trying to deserialize")
  73
  74         try:
  75             length = self.read_compact_size()
  76         except IndexError:
  77             raise SerializationError("attempt to read past end of buffer")
  78
  79         return self.read_bytes(length)
  80
  81     def write_string(self, string):
  82         # Length-encoded as with read-string
  83         self.write_compact_size(len(string))
  84         self.write(string)
  85
  86     def read_bytes(self, length):
  87         try:
  88             result = self.input[self.read_cursor:self.read_cursor+length]
  89             self.read_cursor += length
  90             return result
  91         except IndexError:
  92             raise SerializationError("attempt to read past end of buffer")
  93
  94         return ''
  95
  96     def read_boolean(self): return self.read_bytes(1)[0] != chr(0)
  97     def read_int16(self): return self._read_num('<h')
  98     def read_uint16(self): return self._read_num('<H')
  99     def read_int32(self): return self._read_num('<i')
 100     def read_uint32(self): return self._read_num('<I')
 101     def read_int64(self): return self._read_num('<q')
 102     def read_uint64(self): return self._read_num('<Q')
 103
 104     def write_boolean(self, val): return self.write(chr(1) if val else chr(0))
 105     def write_int16(self, val): return self._write_num('<h', val)
 106     def write_uint16(self, val): return self._write_num('<H', val)
 107     def write_int32(self, val): return self._write_num('<i', val)
 108     def write_uint32(self, val): return self._write_num('<I', val)
 109     def write_int64(self, val): return self._write_num('<q', val)
 110     def write_uint64(self, val): return self._write_num('<Q', val)
 111
 112     def read_compact_size(self):
 113         size = ord(self.input[self.read_cursor])
 114         self.read_cursor += 1
 115         if size == 253:
 116             size = self._read_num('<H')
 117         elif size == 254:
 118             size = self._read_num('<I')
 119         elif size == 255:
 120             size = self._read_num('<Q')
 121         return size
 122
 123     def write_compact_size(self, size):
 124         if size < 0:
 125             raise SerializationError("attempt to write size < 0")
 126         elif size < 253:
 127             self.write(chr(size))
 128         elif size < 2**16:
 129             self.write('\xfd')
 130             self._write_num('<H', size)
 131         elif size < 2**32:
 132             self.write('\xfe')
 133             self._write_num('<I', size)
 134         elif size < 2**64:
 135             self.write('\xff')
 136             self._write_num('<Q', size)
 137
 138     def _read_num(self, format):
 139         (i,) = struct.unpack_from(format, self.input, self.read_cursor)
 140         self.read_cursor += struct.calcsize(format)
 141         return i
 142
 143     def _write_num(self, format, num):
 144         s = struct.pack(format, num)
 145         self.write(s)
 146
 147 #
 148 # enum-like type
 149 # From the Python Cookbook, downloaded from http://code.activestate.com/recipes/67107/
 150 #
 151 import types, string, exceptions
 152
 153 class EnumException(exceptions.Exception):
 154     pass
 155
 156 class Enumeration:
 157     def __init__(self, name, enumList):
 158         self.__doc__ = name
 159         lookup = { }
 160         reverseLookup = { }
 161         i = 0
 162         uniqueNames = [ ]
 163         uniqueValues = [ ]
 164         for x in enumList:
 165             if type(x) == types.TupleType:
 166                 x, i = x
 167             if type(x) != types.StringType:
 168                 raise EnumException, "enum name is not a string: " + x
 169             if type(i) != types.IntType:
 170                 raise EnumException, "enum value is not an integer: " + i
 171             if x in uniqueNames:
 172                 raise EnumException, "enum name is not unique: " + x
 173             if i in uniqueValues:
 174                 raise EnumException, "enum value is not unique for " + x
 175             uniqueNames.append(x)
 176             uniqueValues.append(i)
 177             lookup[x] = i
 178             reverseLookup[i] = x
 179             i = i + 1
 180         self.lookup = lookup
 181         self.reverseLookup = reverseLookup
 182     def __getattr__(self, attr):
 183         if not self.lookup.has_key(attr):
 184             raise AttributeError
 185         return self.lookup[attr]
 186     def whatis(self, value):
 187         return self.reverseLookup[value]
 188
 189
 190 # This function comes from bitcointools, bct-LICENSE.txt.
 191 def long_hex(bytes):
 192     return bytes.encode('hex_codec')
 193
 194 # This function comes from bitcointools, bct-LICENSE.txt.
 195 def short_hex(bytes):
 196     t = bytes.encode('hex_codec')
 197     if len(t) < 11:
 198         return t
 199     return t[0:4]+"..."+t[-4:]
 200
 201
 202
 203
 204 def parse_redeemScript(bytes):
 205     dec = [ x for x in script_GetOp(bytes.decode('hex')) ]
 206
 207     # 2 of 2
 208     match = [ opcodes.OP_2, opcodes.OP_PUSHDATA4, opcodes.OP_PUSHDATA4, opcodes.OP_2, opcodes.OP_CHECKMULTISIG ]
 209     if match_decoded(dec, match):
 210         pubkeys = [ dec[1][1].encode('hex'), dec[2][1].encode('hex') ]
 211         return 2, pubkeys
 212
 213     # 2 of 3
 214     match = [ opcodes.OP_2, opcodes.OP_PUSHDATA4, opcodes.OP_PUSHDATA4, opcodes.OP_PUSHDATA4, opcodes.OP_3, opcodes.OP_CHECKMULTISIG ]
 215     if match_decoded(dec, match):
 216         pubkeys = [ dec[1][1].encode('hex'), dec[2][1].encode('hex'), dec[3][1].encode('hex') ]
 217         return 2, pubkeys
 218
 219
 220
 221 opcodes = Enumeration("Opcodes", [
 222     ("OP_0", 0), ("OP_PUSHDATA1",76), "OP_PUSHDATA2", "OP_PUSHDATA4", "OP_1NEGATE", "OP_RESERVED",
 223     "OP_1", "OP_2", "OP_3", "OP_4", "OP_5", "OP_6", "OP_7",
 224     "OP_8", "OP_9", "OP_10", "OP_11", "OP_12", "OP_13", "OP_14", "OP_15", "OP_16",
 225     "OP_NOP", "OP_VER", "OP_IF", "OP_NOTIF", "OP_VERIF", "OP_VERNOTIF", "OP_ELSE", "OP_ENDIF", "OP_VERIFY",
 226     "OP_RETURN", "OP_TOALTSTACK", "OP_FROMALTSTACK", "OP_2DROP", "OP_2DUP", "OP_3DUP", "OP_2OVER", "OP_2ROT", "OP_2SWAP",
 227     "OP_IFDUP", "OP_DEPTH", "OP_DROP", "OP_DUP", "OP_NIP", "OP_OVER", "OP_PICK", "OP_ROLL", "OP_ROT",
 228     "OP_SWAP", "OP_TUCK", "OP_CAT", "OP_SUBSTR", "OP_LEFT", "OP_RIGHT", "OP_SIZE", "OP_INVERT", "OP_AND",
 229     "OP_OR", "OP_XOR", "OP_EQUAL", "OP_EQUALVERIFY", "OP_RESERVED1", "OP_RESERVED2", "OP_1ADD", "OP_1SUB", "OP_2MUL",
 230     "OP_2DIV", "OP_NEGATE", "OP_ABS", "OP_NOT", "OP_0NOTEQUAL", "OP_ADD", "OP_SUB", "OP_MUL", "OP_DIV",
 231     "OP_MOD", "OP_LSHIFT", "OP_RSHIFT", "OP_BOOLAND", "OP_BOOLOR",
 232     "OP_NUMEQUAL", "OP_NUMEQUALVERIFY", "OP_NUMNOTEQUAL", "OP_LESSTHAN",
 233     "OP_GREATERTHAN", "OP_LESSTHANOREQUAL", "OP_GREATERTHANOREQUAL", "OP_MIN", "OP_MAX",
 234     "OP_WITHIN", "OP_RIPEMD160", "OP_SHA1", "OP_SHA256", "OP_HASH160",
 235     "OP_HASH256", "OP_CODESEPARATOR", "OP_CHECKSIG", "OP_CHECKSIGVERIFY", "OP_CHECKMULTISIG",
 236     "OP_CHECKMULTISIGVERIFY",
 237     ("OP_SINGLEBYTE_END", 0xF0),
 238     ("OP_DOUBLEBYTE_BEGIN", 0xF000),
 239     "OP_PUBKEY", "OP_PUBKEYHASH",
 240     ("OP_INVALIDOPCODE", 0xFFFF),
 241 ])
 242
 243
 244 def script_GetOp(bytes):
 245     i = 0
 246     while i < len(bytes):
 247         vch = None
 248         opcode = ord(bytes[i])
 249         i += 1
 250         if opcode >= opcodes.OP_SINGLEBYTE_END:
 251             opcode <<= 8
 252             opcode |= ord(bytes[i])
 253             i += 1
 254
 255         if opcode <= opcodes.OP_PUSHDATA4:
 256             nSize = opcode
 257             if opcode == opcodes.OP_PUSHDATA1:
 258                 nSize = ord(bytes[i])
 259                 i += 1
 260             elif opcode == opcodes.OP_PUSHDATA2:
 261                 (nSize,) = struct.unpack_from('<H', bytes, i)
 262                 i += 2
 263             elif opcode == opcodes.OP_PUSHDATA4:
 264                 (nSize,) = struct.unpack_from('<I', bytes, i)
 265                 i += 4
 266             vch = bytes[i:i+nSize]
 267             i += nSize
 268
 269         yield (opcode, vch, i)
 270
 271
 272 def script_GetOpName(opcode):
 273     return (opcodes.whatis(opcode)).replace("OP_", "")
 274
 275
 276 def decode_script(bytes):
 277     result = ''
 278     for (opcode, vch, i) in script_GetOp(bytes):
 279         if len(result) > 0: result += " "
 280         if opcode <= opcodes.OP_PUSHDATA4:
 281             result += "%d:"%(opcode,)
 282             result += short_hex(vch)
 283         else:
 284             result += script_GetOpName(opcode)
 285     return result
 286
 287
 288 def match_decoded(decoded, to_match):
 289     if len(decoded) != len(to_match):
 290         return False;
 291     for i in range(len(decoded)):
 292         if to_match[i] == opcodes.OP_PUSHDATA4 and decoded[i][0] <= opcodes.OP_PUSHDATA4 and decoded[i][0]>0:
 293             continue  # Opcodes below OP_PUSHDATA4 all just push data onto stack, and are equivalent.
 294         if to_match[i] != decoded[i][0]:
 295             return False
 296     return True
 297
 298 def get_address_from_input_script(bytes):
 299     try:
 300         decoded = [ x for x in script_GetOp(bytes) ]
 301     except Exception:
 302         # coinbase transactions raise an exception
 303         print_error("cannot find address in input script", bytes.encode('hex'))
 304         return [], [], "(None)"
 305
 306     # payto_pubkey
 307     match = [ opcodes.OP_PUSHDATA4 ]
 308     if match_decoded(decoded, match):
 309         return None, None, "(pubkey)"
 310
 311     # non-generated TxIn transactions push a signature
 312     # (seventy-something bytes) and then their public key
 313     # (65 bytes) onto the stack:
 314     match = [ opcodes.OP_PUSHDATA4, opcodes.OP_PUSHDATA4 ]
 315     if match_decoded(decoded, match):
 316         return None, None, public_key_to_bc_address(decoded[1][1])
 317
 318     # p2sh transaction, 2 of n
 319     match = [ opcodes.OP_0 ]
 320     while len(match) < len(decoded):
 321         match.append(opcodes.OP_PUSHDATA4)
 322
 323     if match_decoded(decoded, match):
 324
 325         redeemScript = decoded[-1][1]
 326         num = len(match) - 2
 327         signatures = map(lambda x:x[1][:-1].encode('hex'), decoded[1:-1])
 328
 329         dec2 = [ x for x in script_GetOp(redeemScript) ]
 330
 331         # 2 of 2
 332         match2 = [ opcodes.OP_2, opcodes.OP_PUSHDATA4, opcodes.OP_PUSHDATA4, opcodes.OP_2, opcodes.OP_CHECKMULTISIG ]
 333         if match_decoded(dec2, match2):
 334             pubkeys = [ dec2[1][1].encode('hex'), dec2[2][1].encode('hex') ]
 335             return pubkeys, signatures, hash_160_to_bc_address(hash_160(redeemScript), 5)
 336
 337         # 2 of 3
 338         match2 = [ opcodes.OP_2, opcodes.OP_PUSHDATA4, opcodes.OP_PUSHDATA4, opcodes.OP_PUSHDATA4, opcodes.OP_3, opcodes.OP_CHECKMULTISIG ]
 339         if match_decoded(dec2, match2):
 340             pubkeys = [ dec2[1][1].encode('hex'), dec2[2][1].encode('hex'), dec2[3][1].encode('hex') ]
 341             return pubkeys, signatures, hash_160_to_bc_address(hash_160(redeemScript), 5)
 342
 343     print_error("cannot find address in input script", bytes.encode('hex'))
 344     return [], [], "(None)"
 345
 346
 347
 348 def get_address_from_output_script(bytes):
 349     decoded = [ x for x in script_GetOp(bytes) ]
 350
 351     # The Genesis Block, self-payments, and pay-by-IP-address payments look like:
 352     # 65 BYTES:... CHECKSIG
 353     match = [ opcodes.OP_PUSHDATA4, opcodes.OP_CHECKSIG ]
 354     if match_decoded(decoded, match):
 355         return True, public_key_to_bc_address(decoded[0][1])
 356
 357     # Pay-by-Bitcoin-address TxOuts look like:
 358     # DUP HASH160 20 BYTES:... EQUALVERIFY CHECKSIG
 359     match = [ opcodes.OP_DUP, opcodes.OP_HASH160, opcodes.OP_PUSHDATA4, opcodes.OP_EQUALVERIFY, opcodes.OP_CHECKSIG ]
 360     if match_decoded(decoded, match):
 361         return False, hash_160_to_bc_address(decoded[2][1])
 362
 363     # p2sh
 364     match = [ opcodes.OP_HASH160, opcodes.OP_PUSHDATA4, opcodes.OP_EQUAL ]
 365     if match_decoded(decoded, match):
 366         return False, hash_160_to_bc_address(decoded[1][1],5)
 367
 368     return False, "(None)"
 369
 370
 371 class Transaction:
 372
 373     def __init__(self, raw, is_complete = True):
 374         self.raw = raw
 375         self.deserialize()
 376         self.inputs = self.d['inputs']
 377         self.outputs = self.d['outputs']
 378         self.outputs = map(lambda x: (x['address'],x['value']), self.outputs)
 379         self.locktime = self.d['lockTime']
 380
 381
 382     def __str__(self):
 383         return self.raw
 384
 385     @classmethod
 386     def from_io(klass, inputs, outputs):
 387         raw = klass.serialize(inputs, outputs, for_sig = -1) # for_sig=-1 means do not sign
 388         self = klass(raw)
 389         self.inputs = inputs
 390         self.outputs = outputs
 391         return self
 392
 393     @classmethod
 394     def multisig_script(klass, public_keys, num=None):
 395         n = len(public_keys)
 396         if num is None: num = n
 397         # supports only "2 of 2", and "2 of 3" transactions
 398         assert num <= n and n in [2,3]
 399
 400         if num==2:
 401             s = '52'
 402         elif num == 3:
 403             s = '53'
 404         else:
 405             raise
 406
 407         for k in public_keys:
 408             s += var_int(len(k)/2)
 409             s += k
 410         if n==2:
 411             s += '52'
 412         elif n==3:
 413             s += '53'
 414         else:
 415             raise
 416         s += 'ae'
 417
 418         return s
 419
 420     @classmethod
 421     def serialize( klass, inputs, outputs, for_sig = None ):
 422
 423         push_script = lambda x: op_push(len(x)/2) + x
 424         s  = int_to_hex(1,4)                                         # version
 425         s += var_int( len(inputs) )                                  # number of inputs
 426         for i in range(len(inputs)):
 427             txin = inputs[i]
 428             s += txin['prevout_hash'].decode('hex')[::-1].encode('hex')   # prev hash
 429             s += int_to_hex(txin['prevout_n'],4)                          # prev index
 430
 431             signatures = txin.get('signatures', {})
 432             if for_sig is None and not signatures:
 433                 script = ''
 434
 435             elif for_sig is None:
 436                 pubkeys = txin['pubkeys']
 437                 sig_list = ''
 438                 for pubkey in pubkeys:
 439                     sig = signatures.get(pubkey)
 440                     if not sig:
 441                         continue
 442                     sig = sig + '01'
 443                     sig_list += push_script(sig)
 444
 445                 if not txin.get('redeemScript'):
 446                     script = sig_list
 447                     script += push_script(pubkeys[0])
 448                 else:
 449                     script = '00'                                    # op_0
 450                     script += sig_list
 451                     redeem_script = klass.multisig_script(pubkeys,2)
 452                     assert redeem_script == txin.get('redeemScript')
 453                     script += push_script(redeem_script)
 454
 455             elif for_sig==i:
 456                 if txin.get('redeemScript'):
 457                     script = txin['redeemScript']                    # p2sh uses the inner script
 458                 else:
 459                     script = txin['scriptPubKey']                    # scriptsig
 460             else:
 461                 script = ''
 462             s += var_int( len(script)/2 )                            # script length
 463             s += script
 464             s += "ffffffff"                                          # sequence
 465
 466         s += var_int( len(outputs) )                                 # number of outputs
 467         for output in outputs:
 468             addr, amount = output
 469             s += int_to_hex( amount, 8)                              # amount
 470             addrtype, hash_160 = bc_address_to_hash_160(addr)
 471             if addrtype == 0:
 472                 script = '76a9'                                      # op_dup, op_hash_160
 473                 script += '14'                                       # push 0x14 bytes
 474                 script += hash_160.encode('hex')
 475                 script += '88ac'                                     # op_equalverify, op_checksig
 476             elif addrtype == 5:
 477                 script = 'a9'                                        # op_hash_160
 478                 script += '14'                                       # push 0x14 bytes
 479                 script += hash_160.encode('hex')
 480                 script += '87'                                       # op_equal
 481             else:
 482                 raise
 483
 484             s += var_int( len(script)/2 )                           #  script length
 485             s += script                                             #  script
 486         s += int_to_hex(0,4)                                        #  lock time
 487         if for_sig is not None and for_sig != -1:
 488             s += int_to_hex(1, 4)                                   #  hash type
 489         return s
 490
 491
 492     def tx_for_sig(self,i):
 493         return self.serialize(self.inputs, self.outputs, for_sig = i)
 494
 495
 496     def hash(self):
 497         return Hash(self.raw.decode('hex') )[::-1].encode('hex')
 498
 499     def add_signature(self, i, pubkey, sig):
 500         txin = self.inputs[i]
 501         signatures = txin.get("signatures",{})
 502         signatures[pubkey] = sig
 503         txin["signatures"] = signatures
 504         self.inputs[i] = txin
 505         print_error("adding signature for", pubkey)
 506         self.raw = self.serialize( self.inputs, self.outputs )
 507
 508
 509     def is_complete(self):
 510         for i, txin in enumerate(self.inputs):
 511             redeem_script = txin.get('redeemScript')
 512             num, redeem_pubkeys = parse_redeemScript(redeem_script) if redeem_script else (1, [txin.get('redeemPubkey')])
 513             signatures = txin.get("signatures",{})
 514             if len(signatures) == num:
 515                 continue
 516             else:
 517                 return False
 518         return True
 519
 520
 521
 522     def sign(self, keypairs):
 523         print_error("tx.sign(), keypairs:", keypairs)
 524
 525         for i, txin in enumerate(self.inputs):
 526
 527             # if the input is multisig, parse redeem script
 528             redeem_script = txin.get('redeemScript')
 529             num, redeem_pubkeys = parse_redeemScript(redeem_script) if redeem_script else (1, [txin.get('redeemPubkey')])
 530
 531             # add pubkeys
 532             txin["pubkeys"] = redeem_pubkeys
 533             # get list of already existing signatures
 534             signatures = txin.get("signatures",{})
 535             # continue if this txin is complete
 536             if len(signatures) == num:
 537                 continue
 538
 539             for_sig = Hash(self.tx_for_sig(i).decode('hex'))
 540             for pubkey in redeem_pubkeys:
 541                 if pubkey in keypairs.keys():
 542                     # add signature
 543                     sec = keypairs[pubkey]
 544                     pkey = regenerate_key(sec)
 545                     secexp = pkey.secret
 546                     private_key = ecdsa.SigningKey.from_secret_exponent( secexp, curve = SECP256k1 )
 547                     public_key = private_key.get_verifying_key()
 548                     sig = private_key.sign_digest_deterministic( for_sig, hashfunc=hashlib.sha256, sigencode = ecdsa.util.sigencode_der )
 549                     assert public_key.verify_digest( sig, for_sig, sigdecode = ecdsa.util.sigdecode_der)
 550                     self.add_signature(i, pubkey, sig.encode('hex'))
 551
 552
 553         print_error("is_complete", self.is_complete())
 554         self.raw = self.serialize( self.inputs, self.outputs )
 555
 556
 557
 558     def deserialize(self):
 559         vds = BCDataStream()
 560         vds.write(self.raw.decode('hex'))
 561         d = {}
 562         start = vds.read_cursor
 563         d['version'] = vds.read_int32()
 564         n_vin = vds.read_compact_size()
 565         d['inputs'] = []
 566         for i in xrange(n_vin):
 567             d['inputs'].append(self.parse_input(vds))
 568         n_vout = vds.read_compact_size()
 569         d['outputs'] = []
 570         for i in xrange(n_vout):
 571             d['outputs'].append(self.parse_output(vds, i))
 572         d['lockTime'] = vds.read_uint32()
 573         self.d = d
 574         return self.d
 575
 576
 577     def parse_input(self, vds):
 578         d = {}
 579         d['prevout_hash'] = hash_encode(vds.read_bytes(32))
 580         d['prevout_n'] = vds.read_uint32()
 581         scriptSig = vds.read_bytes(vds.read_compact_size())
 582         d['sequence'] = vds.read_uint32()
 583
 584         if scriptSig:
 585             pubkeys, signatures, address = get_address_from_input_script(scriptSig)
 586         else:
 587             pubkeys = []
 588             signatures = {}
 589             address = None
 590
 591         d['address'] = address
 592         d['signatures'] = signatures
 593         return d
 594
 595
 596     def parse_output(self, vds, i):
 597         d = {}
 598         d['value'] = vds.read_int64()
 599         scriptPubKey = vds.read_bytes(vds.read_compact_size())
 600         is_pubkey, address = get_address_from_output_script(scriptPubKey)
 601         d['is_pubkey'] = is_pubkey
 602         d['address'] = address
 603         d['scriptPubKey'] = scriptPubKey.encode('hex')
 604         d['prevout_n'] = i
 605         return d
 606
 607
 608     def add_extra_addresses(self, txlist):
 609         for i in self.inputs:
 610             if i.get("address") == "(pubkey)":
 611                 prev_tx = txlist.get(i.get('prevout_hash'))
 612                 if prev_tx:
 613                     address, value = prev_tx.outputs[i.get('prevout_n')]
 614                     print_error("found pay-to-pubkey address:", address)
 615                     i["address"] = address
 616
 617
 618     def has_address(self, addr):
 619         found = False
 620         for txin in self.inputs:
 621             if addr == txin.get('address'):
 622                 found = True
 623                 break
 624         for txout in self.outputs:
 625             if addr == txout[0]:
 626                 found = True
 627                 break
 628         return found
 629
 630
 631     def get_value(self, addresses, prevout_values):
 632         # return the balance for that tx
 633         is_relevant = False
 634         is_send = False
 635         is_pruned = False
 636         is_partial = False
 637         v_in = v_out = v_out_mine = 0
 638
 639         for item in self.inputs:
 640             addr = item.get('address')
 641             if addr in addresses:
 642                 is_send = True
 643                 is_relevant = True
 644                 key = item['prevout_hash']  + ':%d'%item['prevout_n']
 645                 value = prevout_values.get( key )
 646                 if value is None:
 647                     is_pruned = True
 648                 else:
 649                     v_in += value
 650             else:
 651                 is_partial = True
 652
 653         if not is_send: is_partial = False
 654
 655         for item in self.outputs:
 656             addr, value = item
 657             v_out += value
 658             if addr in addresses:
 659                 v_out_mine += value
 660                 is_relevant = True
 661
 662         if is_pruned:
 663             # some inputs are mine:
 664             fee = None
 665             if is_send:
 666                 v = v_out_mine - v_out
 667             else:
 668                 # no input is mine
 669                 v = v_out_mine
 670
 671         else:
 672             v = v_out_mine - v_in
 673
 674             if is_partial:
 675                 # some inputs are mine, but not all
 676                 fee = None
 677                 is_send = v < 0
 678             else:
 679                 # all inputs are mine
 680                 fee = v_out - v_in
 681
 682         return is_relevant, is_send, v, fee
 683
 684
 685     def get_input_info(self):
 686         info = []
 687         for i in self.inputs:
 688             item = {
 689                 'prevout_hash':i['prevout_hash'],
 690                 'prevout_n':i['prevout_n'],
 691                 'address':i.get('address'),
 692                 'KeyID':i.get('KeyID'),
 693                 'scriptPubKey':i.get('scriptPubKey'),
 694                 'redeemScript':i.get('redeemScript'),
 695                 'redeemPubkey':i.get('redeemPubkey'),
 696                 'pubkeys':i.get('pubkeys'),
 697                 'signatures':i.get('signatures',{}),
 698                 }
 699             info.append(item)
 700         return info
 701
 702
 703     def as_dict(self):
 704         import json
 705         out = {
 706             "hex":self.raw,
 707             "complete":self.is_complete()
 708             }
 709
 710         if not self.is_complete():
 711             input_info = self.get_input_info()
 712             out['input_info'] = json.dumps(input_info).replace(' ','')
 713
 714         return out
 715
 716
 717     def requires_fee(self, verifier):
 718         # see https://en.bitcoin.it/wiki/Transaction_fees
 719         threshold = 57600000
 720         size = len(self.raw)/2
 721         if size >= 10000:
 722             return True
 723
 724         for o in self.outputs:
 725             value = o[1]
 726             if value < 1000000:
 727                 return True
 728         sum = 0
 729         for i in self.inputs:
 730             age = verifier.get_confirmations(i["prevout_hash"])[0]
 731             sum += i["value"] * age
 732         priority = sum / size
 733         print_error(priority, threshold)
 734         return priority < threshold
 735
 736
 737
 738     def add_input_info(self, input_info):
 739         for i, txin in enumerate(self.inputs):
 740             item = input_info[i]
 741             txin['address'] = item['address']
 742             txin['signatures'] = item['signatures']
 743             txin['scriptPubKey'] = item['scriptPubKey']
 744             txin['redeemScript'] = item.get('redeemScript')
 745             txin['redeemPubkey'] = item.get('redeemPubkey')
 746             txin['KeyID'] = item.get('KeyID')