lib/wallet.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 import sys
  20 import os
  21 import hashlib
  22 import ast
  23 import threading
  24 import random
  25 import time
  26 import math
  27
  28 from util import print_msg, print_error
  29
  30 from bitcoin import *
  31 from account import *
  32 from version import *
  33
  34 from transaction import Transaction
  35 from plugins import run_hook
  36 import bitcoin
  37 from synchronizer import WalletSynchronizer
  38
  39 COINBASE_MATURITY = 100
  40 DUST_THRESHOLD = 5430
  41
  42 # internal ID for imported account
  43 IMPORTED_ACCOUNT = '/x'
  44
  45
  46 class WalletStorage(object):
  47
  48     def __init__(self, config):
  49         self.lock = threading.RLock()
  50         self.config = config
  51         self.data = {}
  52         self.file_exists = False
  53         self.path = self.init_path(config)
  54         print_error( "wallet path", self.path )
  55         if self.path:
  56             self.read(self.path)
  57
  58     def init_path(self, config):
  59         """Set the path of the wallet."""
  60
  61         # command line -w option
  62         path = config.get('wallet_path')
  63         if path:
  64             return path
  65
  66         # path in config file
  67         path = config.get('default_wallet_path')
  68         if path:
  69             return path
  70
  71         # default path
  72         dirpath = os.path.join(config.path, "wallets")
  73         if not os.path.exists(dirpath):
  74             os.mkdir(dirpath)
  75
  76         new_path = os.path.join(config.path, "wallets", "default_wallet")
  77
  78         # default path in pre 1.9 versions
  79         old_path = os.path.join(config.path, "electrum.dat")
  80         if os.path.exists(old_path) and not os.path.exists(new_path):
  81             os.rename(old_path, new_path)
  82
  83         return new_path
  84
  85     def read(self, path):
  86         """Read the contents of the wallet file."""
  87         try:
  88             with open(self.path, "r") as f:
  89                 data = f.read()
  90         except IOError:
  91             return
  92         try:
  93             d = ast.literal_eval( data )  #parse raw data from reading wallet file
  94         except Exception:
  95             raise IOError("Cannot read wallet file.")
  96
  97         self.data = d
  98         self.file_exists = True
  99
 100     def get(self, key, default=None):
 101
 102         with self.lock:
 103             v = self.data.get(key)
 104             if v is None:
 105                 v = default
 106             return v
 107
 108     def put(self, key, value, save = True):
 109
 110         with self.lock:
 111             if value is not None:
 112                 self.data[key] = value
 113             elif key in self.data:
 114                 self.data.pop(key)
 115             if save:
 116                 self.write()
 117
 118     def write(self):
 119         s = repr(self.data)
 120         f = open(self.path,"w")
 121         f.write( s )
 122         f.close()
 123         if 'ANDROID_DATA' not in os.environ:
 124             import stat
 125             os.chmod(self.path,stat.S_IREAD | stat.S_IWRITE)
 126
 127
 128 class Abstract_Wallet(object):
 129     """
 130     Wallet classes are created to handle various address generation methods.
 131     Completion states (watching-only, single account, no seed, etc) are handled inside classes.
 132     """
 133     def __init__(self, storage):
 134         self.storage = storage
 135         self.electrum_version = ELECTRUM_VERSION
 136         self.gap_limit_for_change = 3 # constant
 137         # saved fields
 138         self.seed_version          = storage.get('seed_version', NEW_SEED_VERSION)
 139         self.gap_limit             = storage.get('gap_limit', 5)
 140         self.use_change            = storage.get('use_change',True)
 141         self.use_encryption        = storage.get('use_encryption', False)
 142         self.seed                  = storage.get('seed', '')               # encrypted
 143         self.labels                = storage.get('labels', {})
 144         self.frozen_addresses      = storage.get('frozen_addresses',[])
 145         self.addressbook           = storage.get('contacts', [])
 146
 147         self.history               = storage.get('addr_history',{})        # address -> list(txid, height)
 148
 149         self.fee                   = int(storage.get('fee_per_kb', 10000))
 150
 151         self.next_addresses = storage.get('next_addresses',{})
 152
 153         # This attribute is set when wallet.start_threads is called.
 154         self.synchronizer = None
 155
 156         # imported_keys is deprecated. The GUI should call convert_imported_keys
 157         self.imported_keys = self.storage.get('imported_keys',{})
 158
 159         self.load_accounts()
 160
 161         self.transactions = {}
 162         tx_list = self.storage.get('transactions',{})
 163         for k, raw in tx_list.items():
 164             try:
 165                 tx = Transaction.deserialize(raw)
 166             except Exception:
 167                 print_msg("Warning: Cannot deserialize transactions. skipping")
 168                 continue
 169
 170             self.add_pubkey_addresses(tx)
 171             self.transactions[k] = tx
 172
 173         for h,tx in self.transactions.items():
 174             if not self.check_new_tx(h, tx):
 175                 print_error("removing unreferenced tx", h)
 176                 self.transactions.pop(h)
 177
 178         # not saved
 179         self.prevout_values = {}     # my own transaction outputs
 180         self.spent_outputs = []
 181
 182         # spv
 183         self.verifier = None
 184
 185         # there is a difference between wallet.up_to_date and interface.is_up_to_date()
 186         # interface.is_up_to_date() returns true when all requests have been answered and processed
 187         # wallet.up_to_date is true when the wallet is synchronized (stronger requirement)
 188
 189         self.up_to_date = False
 190         self.lock = threading.Lock()
 191         self.transaction_lock = threading.Lock()
 192         self.tx_event = threading.Event()
 193         for tx_hash, tx in self.transactions.items():
 194             self.update_tx_outputs(tx_hash)
 195
 196     def add_pubkey_addresses(self, tx):
 197         # find the address corresponding to pay-to-pubkey inputs
 198         h = tx.hash()
 199
 200         # inputs
 201         tx.add_pubkey_addresses(self.transactions)
 202
 203         # outputs of tx: inputs of tx2
 204         for type, x, v in tx.outputs:
 205             if type == 'pubkey':
 206                 for tx2 in self.transactions.values():
 207                     tx2.add_pubkey_addresses({h:tx})
 208
 209     def get_action(self):
 210         pass
 211
 212     def convert_imported_keys(self, password):
 213         for k, v in self.imported_keys.items():
 214             sec = pw_decode(v, password)
 215             pubkey = public_key_from_private_key(sec)
 216             address = public_key_to_bc_address(pubkey.decode('hex'))
 217             assert address == k
 218             self.import_key(sec, password)
 219             self.imported_keys.pop(k)
 220         self.storage.put('imported_keys', self.imported_keys)
 221
 222     def load_accounts(self):
 223         self.accounts = {}
 224
 225         d = self.storage.get('accounts', {})
 226         for k, v in d.items():
 227             if k == 0:
 228                 v['mpk'] = self.storage.get('master_public_key')
 229                 self.accounts[k] = OldAccount(v)
 230             elif v.get('imported'):
 231                 self.accounts[k] = ImportedAccount(v)
 232             elif v.get('xpub3'):
 233                 self.accounts[k] = BIP32_Account_2of3(v)
 234             elif v.get('xpub2'):
 235                 self.accounts[k] = BIP32_Account_2of2(v)
 236             elif v.get('xpub'):
 237                 self.accounts[k] = BIP32_Account(v)
 238             elif v.get('pending'):
 239                 self.accounts[k] = PendingAccount(v)
 240             else:
 241                 print_error("cannot load account", v)
 242
 243     def synchronize(self):
 244         pass
 245
 246     def can_create_accounts(self):
 247         return False
 248
 249     def set_up_to_date(self,b):
 250         with self.lock: self.up_to_date = b
 251
 252     def is_up_to_date(self):
 253         with self.lock: return self.up_to_date
 254
 255     def update(self):
 256         self.up_to_date = False
 257         while not self.is_up_to_date():
 258             time.sleep(0.1)
 259
 260     def is_imported(self, addr):
 261         account = self.accounts.get(IMPORTED_ACCOUNT)
 262         if account:
 263             return addr in account.get_addresses(0)
 264         else:
 265             return False
 266
 267     def has_imported_keys(self):
 268         account = self.accounts.get(IMPORTED_ACCOUNT)
 269         return account is not None
 270
 271     def import_key(self, sec, password):
 272         try:
 273             pubkey = public_key_from_private_key(sec)
 274             address = public_key_to_bc_address(pubkey.decode('hex'))
 275         except Exception:
 276             raise Exception('Invalid private key')
 277
 278         if self.is_mine(address):
 279             raise Exception('Address already in wallet')
 280
 281         if self.accounts.get(IMPORTED_ACCOUNT) is None:
 282             self.accounts[IMPORTED_ACCOUNT] = ImportedAccount({'imported':{}})
 283         self.accounts[IMPORTED_ACCOUNT].add(address, pubkey, sec, password)
 284         self.save_accounts()
 285
 286         if self.synchronizer:
 287             self.synchronizer.subscribe_to_addresses([address])
 288         return address
 289
 290     def delete_imported_key(self, addr):
 291         account = self.accounts[IMPORTED_ACCOUNT]
 292         account.remove(addr)
 293         if not account.get_addresses(0):
 294             self.accounts.pop(IMPORTED_ACCOUNT)
 295         self.save_accounts()
 296
 297     def set_label(self, name, text = None):
 298         changed = False
 299         old_text = self.labels.get(name)
 300         if text:
 301             if old_text != text:
 302                 self.labels[name] = text
 303                 changed = True
 304         else:
 305             if old_text:
 306                 self.labels.pop(name)
 307                 changed = True
 308
 309         if changed:
 310             self.storage.put('labels', self.labels, True)
 311
 312         run_hook('set_label', name, text, changed)
 313         return changed
 314
 315     def addresses(self, include_change = True, _next=True):
 316         o = []
 317         for a in self.accounts.keys():
 318             o += self.get_account_addresses(a, include_change)
 319
 320         if _next:
 321             for addr in self.next_addresses.values():
 322                 if addr not in o:
 323                     o += [addr]
 324         return o
 325
 326     def is_mine(self, address):
 327         return address in self.addresses(True)
 328
 329     def is_change(self, address):
 330         if not self.is_mine(address): return False
 331         acct, s = self.get_address_index(address)
 332         if s is None: return False
 333         return s[0] == 1
 334
 335     def get_address_index(self, address):
 336         for account in self.accounts.keys():
 337             for for_change in [0,1]:
 338                 addresses = self.accounts[account].get_addresses(for_change)
 339                 for addr in addresses:
 340                     if address == addr:
 341                         return account, (for_change, addresses.index(addr))
 342
 343         for k,v in self.next_addresses.items():
 344             if v == address:
 345                 return k, (0,0)
 346
 347         raise Exception("Address not found", address)
 348
 349     def get_private_key(self, address, password):
 350         if self.is_watching_only():
 351             return []
 352         account_id, sequence = self.get_address_index(address)
 353         return self.accounts[account_id].get_private_key(sequence, self, password)
 354
 355     def get_public_keys(self, address):
 356         account_id, sequence = self.get_address_index(address)
 357         return self.accounts[account_id].get_pubkeys(sequence)
 358
 359     def add_keypairs(self, tx, keypairs, password):
 360         # first check the provided password. This will raise if invalid.
 361         self.check_password(password)
 362
 363         addr_list, xpub_list = tx.inputs_to_sign()
 364         for addr in addr_list:
 365             if self.is_mine(addr):
 366                 private_keys = self.get_private_key(addr, password)
 367                 for sec in private_keys:
 368                     pubkey = public_key_from_private_key(sec)
 369                     keypairs[ pubkey ] = sec
 370
 371         for xpub, sequence in xpub_list:
 372             # look for account that can sign
 373             for k, account in self.accounts.items():
 374                 if xpub in account.get_master_pubkeys():
 375                     break
 376             else:
 377                 continue
 378             pk = account.get_private_key(sequence, self, password)
 379             for sec in pk:
 380                 pubkey = public_key_from_private_key(sec)
 381                 keypairs[pubkey] = sec
 382
 383     def signrawtransaction(self, tx, private_keys, password):
 384         # check that the password is correct. This will raise if it's not.
 385         self.get_seed(password)
 386
 387         # build a list of public/private keys
 388         keypairs = {}
 389
 390         # add private keys from parameter
 391         for sec in private_keys:
 392             pubkey = public_key_from_private_key(sec)
 393             keypairs[ pubkey ] = sec
 394
 395         # add private_keys
 396         self.add_keypairs(tx, keypairs, password)
 397
 398         # sign the transaction
 399         self.sign_transaction(tx, keypairs, password)
 400
 401     def sign_message(self, address, message, password):
 402         keys = self.get_private_key(address, password)
 403         assert len(keys) == 1
 404         sec = keys[0]
 405         key = regenerate_key(sec)
 406         compressed = is_compressed(sec)
 407         return key.sign_message(message, compressed, address)
 408
 409     def decrypt_message(self, pubkey, message, password):
 410         address = public_key_to_bc_address(pubkey.decode('hex'))
 411         keys = self.get_private_key(address, password)
 412         secret = keys[0]
 413         ec = regenerate_key(secret)
 414         decrypted = ec.decrypt_message(message)
 415         return decrypted
 416
 417     def is_found(self):
 418         return self.history.values() != [[]] * len(self.history)
 419
 420     def add_contact(self, address, label=None):
 421         self.addressbook.append(address)
 422         self.storage.put('contacts', self.addressbook, True)
 423         if label:
 424             self.set_label(address, label)
 425
 426     def delete_contact(self, addr):
 427         if addr in self.addressbook:
 428             self.addressbook.remove(addr)
 429             self.storage.put('addressbook', self.addressbook, True)
 430
 431     def fill_addressbook(self):
 432         for tx_hash, tx in self.transactions.items():
 433             is_relevant, is_send, _, _ = self.get_tx_value(tx)
 434             if is_send:
 435                 for addr in tx.get_output_addresses():
 436                     if not self.is_mine(addr) and addr not in self.addressbook:
 437                         self.addressbook.append(addr)
 438         # redo labels
 439         # self.update_tx_labels()
 440
 441     def get_num_tx(self, address):
 442         n = 0
 443         for tx in self.transactions.values():
 444             if address in tx.get_output_addresses(): n += 1
 445         return n
 446
 447     def get_address_flags(self, addr):
 448         flags = "C" if self.is_change(addr) else "I" if addr in self.imported_keys.keys() else "-"
 449         flags += "F" if addr in self.frozen_addresses else "-"
 450         return flags
 451
 452     def get_tx_value(self, tx, account=None):
 453         domain = self.get_account_addresses(account)
 454         return tx.get_value(domain, self.prevout_values)
 455
 456     def update_tx_outputs(self, tx_hash):
 457         tx = self.transactions.get(tx_hash)
 458
 459         for i, (addr, value) in enumerate(tx.get_outputs()):
 460             key = tx_hash+ ':%d'%i
 461             self.prevout_values[key] = value
 462
 463         for item in tx.inputs:
 464             if self.is_mine(item.get('address')):
 465                 key = item['prevout_hash'] + ':%d'%item['prevout_n']
 466                 self.spent_outputs.append(key)
 467
 468     def get_addr_balance(self, address):
 469         #assert self.is_mine(address)
 470         h = self.history.get(address,[])
 471         if h == ['*']: return 0,0
 472         c = u = 0
 473         received_coins = []   # list of coins received at address
 474
 475         for tx_hash, tx_height in h:
 476             tx = self.transactions.get(tx_hash)
 477             if not tx: continue
 478
 479             for i, (addr, value) in enumerate(tx.get_outputs()):
 480                 if addr == address:
 481                     key = tx_hash + ':%d'%i
 482                     received_coins.append(key)
 483
 484         for tx_hash, tx_height in h:
 485             tx = self.transactions.get(tx_hash)
 486             if not tx: continue
 487             v = 0
 488
 489             for item in tx.inputs:
 490                 addr = item.get('address')
 491                 if addr == address:
 492                     key = item['prevout_hash']  + ':%d'%item['prevout_n']
 493                     value = self.prevout_values.get( key )
 494                     if key in received_coins:
 495                         v -= value
 496
 497             for i, (addr, value) in enumerate(tx.get_outputs()):
 498                 key = tx_hash + ':%d'%i
 499                 if addr == address:
 500                     v += value
 501
 502             if tx_height:
 503                 c += v
 504             else:
 505                 u += v
 506         return c, u
 507
 508     def get_account_name(self, k):
 509         return self.labels.get(k, self.accounts[k].get_name(k))
 510
 511     def get_account_names(self):
 512         account_names = {}
 513         for k in self.accounts.keys():
 514             account_names[k] = self.get_account_name(k)
 515         return account_names
 516
 517     def get_account_addresses(self, a, include_change=True):
 518         if a is None:
 519             o = self.addresses(include_change)
 520         elif a in self.accounts:
 521             ac = self.accounts[a]
 522             o = ac.get_addresses(0)
 523             if include_change: o += ac.get_addresses(1)
 524         return o
 525
 526     def get_account_balance(self, account):
 527         return self.get_balance(self.get_account_addresses(account))
 528
 529     def get_frozen_balance(self):
 530         return self.get_balance(self.frozen_addresses)
 531
 532     def get_balance(self, domain=None):
 533         if domain is None: domain = self.addresses(True)
 534         cc = uu = 0
 535         for addr in domain:
 536             c, u = self.get_addr_balance(addr)
 537             cc += c
 538             uu += u
 539         return cc, uu
 540
 541     def get_unspent_coins(self, domain=None):
 542         coins = []
 543         if domain is None: domain = self.addresses(True)
 544         for addr in domain:
 545             h = self.history.get(addr, [])
 546             if h == ['*']: continue
 547             for tx_hash, tx_height in h:
 548                 tx = self.transactions.get(tx_hash)
 549                 if tx is None: raise Exception("Wallet not synchronized")
 550                 is_coinbase = tx.inputs[0].get('prevout_hash') == '0'*64
 551                 for i, (address, value) in enumerate(tx.get_outputs()):
 552                     output = {'address':address, 'value':value, 'prevout_n':i}
 553                     if address != addr: continue
 554                     key = tx_hash + ":%d"%i
 555                     if key in self.spent_outputs: continue
 556                     output['prevout_hash'] = tx_hash
 557                     output['height'] = tx_height
 558                     output['coinbase'] = is_coinbase
 559                     coins.append((tx_height, output))
 560
 561         # sort by age
 562         if coins:
 563             coins = sorted(coins)
 564             if coins[-1][0] != 0:
 565                 while coins[0][0] == 0:
 566                     coins = coins[1:] + [ coins[0] ]
 567         return [x[1] for x in coins]
 568
 569     def choose_tx_inputs( self, amount, fixed_fee, num_outputs, domain = None, coins = None ):
 570         """ todo: minimize tx size """
 571         total = 0
 572         fee = self.fee if fixed_fee is None else fixed_fee
 573
 574         if not coins:
 575             if domain is None:
 576                 domain = self.addresses(True)
 577             for i in self.frozen_addresses:
 578                 if i in domain: domain.remove(i)
 579             coins = self.get_unspent_coins(domain)
 580
 581         inputs = []
 582
 583         for item in coins:
 584             if item.get('coinbase') and item.get('height') + COINBASE_MATURITY > self.network.get_local_height():
 585                 continue
 586             v = item.get('value')
 587             total += v
 588             inputs.append(item)
 589             fee = self.estimated_fee(inputs, num_outputs) if fixed_fee is None else fixed_fee
 590             if total >= amount + fee: break
 591         else:
 592             inputs = []
 593
 594         return inputs, total, fee
 595
 596     def set_fee(self, fee):
 597         if self.fee != fee:
 598             self.fee = fee
 599             self.storage.put('fee_per_kb', self.fee, True)
 600
 601     def estimated_fee(self, inputs, num_outputs):
 602         estimated_size =  len(inputs) * 180 + num_outputs * 34    # this assumes non-compressed keys
 603         fee = self.fee * int(math.ceil(estimated_size/1000.))
 604         return fee
 605
 606     def add_tx_change( self, inputs, outputs, amount, fee, total, change_addr=None):
 607         "add change to a transaction"
 608         change_amount = total - ( amount + fee )
 609         if change_amount > DUST_THRESHOLD:
 610             if not change_addr:
 611
 612                 # send change to one of the accounts involved in the tx
 613                 address = inputs[0].get('address')
 614                 account, _ = self.get_address_index(address)
 615
 616                 if not self.use_change or account == IMPORTED_ACCOUNT:
 617                     change_addr = inputs[-1]['address']
 618                 else:
 619                     change_addr = self.accounts[account].get_addresses(1)[-self.gap_limit_for_change]
 620
 621             # Insert the change output at a random position in the outputs
 622             posn = random.randint(0, len(outputs))
 623             outputs[posn:posn] = [( 'address', change_addr,  change_amount)]
 624         return outputs
 625
 626     def get_history(self, address):
 627         with self.lock:
 628             return self.history.get(address)
 629
 630     def get_status(self, h):
 631         if not h: return None
 632         if h == ['*']: return '*'
 633         status = ''
 634         for tx_hash, height in h:
 635             status += tx_hash + ':%d:' % height
 636         return hashlib.sha256( status ).digest().encode('hex')
 637
 638     def receive_tx_callback(self, tx_hash, tx, tx_height):
 639
 640         with self.transaction_lock:
 641             self.add_pubkey_addresses(tx)
 642             if not self.check_new_tx(tx_hash, tx):
 643                 # may happen due to pruning
 644                 print_error("received transaction that is no longer referenced in history", tx_hash)
 645                 return
 646             self.transactions[tx_hash] = tx
 647             self.network.pending_transactions_for_notifications.append(tx)
 648             self.save_transactions()
 649             if self.verifier and tx_height>0:
 650                 self.verifier.add(tx_hash, tx_height)
 651             self.update_tx_outputs(tx_hash)
 652
 653     def save_transactions(self):
 654         tx = {}
 655         for k,v in self.transactions.items():
 656             tx[k] = str(v)
 657         self.storage.put('transactions', tx, True)
 658
 659     def receive_history_callback(self, addr, hist):
 660
 661         if not self.check_new_history(addr, hist):
 662             raise Exception("error: received history for %s is not consistent with known transactions"%addr)
 663
 664         with self.lock:
 665             self.history[addr] = hist
 666             self.storage.put('addr_history', self.history, True)
 667
 668         if hist != ['*']:
 669             for tx_hash, tx_height in hist:
 670                 if tx_height>0:
 671                     # add it in case it was previously unconfirmed
 672                     if self.verifier: self.verifier.add(tx_hash, tx_height)
 673
 674     def get_tx_history(self, account=None):
 675         if not self.verifier:
 676             return []
 677
 678         with self.transaction_lock:
 679             history = self.transactions.items()
 680             history.sort(key = lambda x: self.verifier.get_txpos(x[0]))
 681             result = []
 682
 683             balance = 0
 684             for tx_hash, tx in history:
 685                 is_relevant, is_mine, v, fee = self.get_tx_value(tx, account)
 686                 if v is not None: balance += v
 687
 688             c, u = self.get_account_balance(account)
 689
 690             if balance != c+u:
 691                 result.append( ('', 1000, 0, c+u-balance, None, c+u-balance, None ) )
 692
 693             balance = c + u - balance
 694             for tx_hash, tx in history:
 695                 is_relevant, is_mine, value, fee = self.get_tx_value(tx, account)
 696                 if not is_relevant:
 697                     continue
 698                 if value is not None:
 699                     balance += value
 700
 701                 conf, timestamp = self.verifier.get_confirmations(tx_hash) if self.verifier else (None, None)
 702                 result.append( (tx_hash, conf, is_mine, value, fee, balance, timestamp) )
 703
 704         return result
 705
 706     def get_label(self, tx_hash):
 707         label = self.labels.get(tx_hash)
 708         is_default = (label == '') or (label is None)
 709         if is_default: label = self.get_default_label(tx_hash)
 710         return label, is_default
 711
 712     def get_default_label(self, tx_hash):
 713         tx = self.transactions.get(tx_hash)
 714         default_label = ''
 715         if tx:
 716             is_relevant, is_mine, _, _ = self.get_tx_value(tx)
 717             if is_mine:
 718                 for o_addr in tx.get_output_addresses():
 719                     if not self.is_mine(o_addr):
 720                         try:
 721                             default_label = self.labels[o_addr]
 722                         except KeyError:
 723                             default_label = '>' + o_addr
 724                         break
 725                 else:
 726                     default_label = '(internal)'
 727             else:
 728                 for o_addr in tx.get_output_addresses():
 729                     if self.is_mine(o_addr) and not self.is_change(o_addr):
 730                         break
 731                 else:
 732                     for o_addr in tx.get_output_addresses():
 733                         if self.is_mine(o_addr):
 734                             break
 735                     else:
 736                         o_addr = None
 737
 738                 if o_addr:
 739                     try:
 740                         default_label = self.labels[o_addr]
 741                     except KeyError:
 742                         default_label = '<' + o_addr
 743
 744         return default_label
 745
 746     def make_unsigned_transaction(self, outputs, fee=None, change_addr=None, domain=None, coins=None ):
 747         for type, address, x in outputs:
 748             if type == 'op_return':
 749                 continue
 750             if type == 'address':
 751                 assert is_address(address), "Address " + address + " is invalid!"
 752         amount = sum( map(lambda x:x[2], outputs) )
 753         inputs, total, fee = self.choose_tx_inputs( amount, fee, len(outputs), domain, coins )
 754         if not inputs:
 755             raise ValueError("Not enough funds")
 756         for txin in inputs:
 757             self.add_input_info(txin)
 758         outputs = self.add_tx_change(inputs, outputs, amount, fee, total, change_addr)
 759         return Transaction(inputs, outputs)
 760
 761     def mktx(self, outputs, password, fee=None, change_addr=None, domain= None, coins = None ):
 762         tx = self.make_unsigned_transaction(outputs, fee, change_addr, domain, coins)
 763         keypairs = {}
 764         self.add_keypairs(tx, keypairs, password)
 765         if keypairs:
 766             self.sign_transaction(tx, keypairs, password)
 767         return tx
 768
 769     def add_input_info(self, txin):
 770         address = txin['address']
 771         account_id, sequence = self.get_address_index(address)
 772         account = self.accounts[account_id]
 773         redeemScript = account.redeem_script(*sequence)
 774         pubkeys = account.get_pubkeys(*sequence)
 775         x_pubkeys = account.get_xpubkeys(*sequence)
 776         # sort pubkeys and x_pubkeys, using the order of pubkeys
 777         pubkeys, x_pubkeys = zip( *sorted(zip(pubkeys, x_pubkeys)))
 778         txin['pubkeys'] = list(pubkeys)
 779         txin['x_pubkeys'] = list(x_pubkeys)
 780         txin['signatures'] = [None] * len(pubkeys)
 781
 782         if redeemScript:
 783             txin['redeemScript'] = redeemScript
 784             txin['num_sig'] = 2
 785         else:
 786             txin['redeemPubkey'] = account.get_pubkey(*sequence)
 787             txin['num_sig'] = 1
 788
 789     def sign_transaction(self, tx, keypairs, password):
 790         tx.sign(keypairs)
 791         run_hook('sign_transaction', tx, password)
 792
 793     def sendtx(self, tx):
 794         # synchronous
 795         h = self.send_tx(tx)
 796         self.tx_event.wait()
 797         return self.receive_tx(h, tx)
 798
 799     def send_tx(self, tx):
 800         # asynchronous
 801         self.tx_event.clear()
 802         self.network.send([('blockchain.transaction.broadcast', [str(tx)])], self.on_broadcast)
 803         return tx.hash()
 804
 805     def on_broadcast(self, i, r):
 806         self.tx_result = r.get('result')
 807         self.tx_event.set()
 808
 809     def receive_tx(self, tx_hash, tx):
 810         out = self.tx_result
 811         if out != tx_hash:
 812             return False, "error: " + out
 813         run_hook('receive_tx', tx, self)
 814         return True, out
 815
 816     def update_password(self, old_password, new_password):
 817         if new_password == '':
 818             new_password = None
 819
 820         if self.has_seed():
 821             decoded = self.get_seed(old_password)
 822             self.seed = pw_encode( decoded, new_password)
 823             self.storage.put('seed', self.seed, True)
 824
 825         imported_account = self.accounts.get(IMPORTED_ACCOUNT)
 826         if imported_account:
 827             imported_account.update_password(old_password, new_password)
 828             self.save_accounts()
 829
 830         for k, v in self.master_private_keys.items():
 831             b = pw_decode(v, old_password)
 832             c = pw_encode(b, new_password)
 833             self.master_private_keys[k] = c
 834         self.storage.put('master_private_keys', self.master_private_keys, True)
 835
 836         self.use_encryption = (new_password != None)
 837         self.storage.put('use_encryption', self.use_encryption,True)
 838
 839     def freeze(self,addr):
 840         if self.is_mine(addr) and addr not in self.frozen_addresses:
 841             self.frozen_addresses.append(addr)
 842             self.storage.put('frozen_addresses', self.frozen_addresses, True)
 843             return True
 844         else:
 845             return False
 846
 847     def unfreeze(self,addr):
 848         if self.is_mine(addr) and addr in self.frozen_addresses:
 849             self.frozen_addresses.remove(addr)
 850             self.storage.put('frozen_addresses', self.frozen_addresses, True)
 851             return True
 852         else:
 853             return False
 854
 855     def set_verifier(self, verifier):
 856         self.verifier = verifier
 857
 858         # review transactions that are in the history
 859         for addr, hist in self.history.items():
 860             if hist == ['*']: continue
 861             for tx_hash, tx_height in hist:
 862                 if tx_height>0:
 863                     # add it in case it was previously unconfirmed
 864                     self.verifier.add(tx_hash, tx_height)
 865
 866         # if we are on a pruning server, remove unverified transactions
 867         vr = self.verifier.transactions.keys() + self.verifier.verified_tx.keys()
 868         for tx_hash in self.transactions.keys():
 869             if tx_hash not in vr:
 870                 self.transactions.pop(tx_hash)
 871
 872     def check_new_history(self, addr, hist):
 873         # check that all tx in hist are relevant
 874         if hist != ['*']:
 875             for tx_hash, height in hist:
 876                 tx = self.transactions.get(tx_hash)
 877                 if not tx: continue
 878                 if not tx.has_address(addr):
 879                     return False
 880
 881         # check that we are not "orphaning" a transaction
 882         old_hist = self.history.get(addr,[])
 883         if old_hist == ['*']: return True
 884
 885         for tx_hash, height in old_hist:
 886             if tx_hash in map(lambda x:x[0], hist): continue
 887             found = False
 888             for _addr, _hist in self.history.items():
 889                 if _addr == addr: continue
 890                 if _hist == ['*']: continue
 891                 _tx_hist = map(lambda x:x[0], _hist)
 892                 if tx_hash in _tx_hist:
 893                     found = True
 894                     break
 895
 896             if not found:
 897                 tx = self.transactions.get(tx_hash)
 898                 # tx might not be there
 899                 if not tx: continue
 900
 901                 # already verified?
 902                 if self.verifier.get_height(tx_hash):
 903                     continue
 904                 # unconfirmed tx
 905                 print_error("new history is orphaning transaction:", tx_hash)
 906                 # check that all outputs are not mine, request histories
 907                 ext_requests = []
 908                 for _addr in tx.get_output_addresses():
 909                     # assert not self.is_mine(_addr)
 910                     ext_requests.append( ('blockchain.address.get_history', [_addr]) )
 911
 912                 ext_h = self.network.synchronous_get(ext_requests)
 913                 print_error("sync:", ext_requests, ext_h)
 914                 height = None
 915                 for h in ext_h:
 916                     if h == ['*']: continue
 917                     for item in h:
 918                         if item.get('tx_hash') == tx_hash:
 919                             height = item.get('height')
 920                 if height:
 921                     print_error("found height for", tx_hash, height)
 922                     self.verifier.add(tx_hash, height)
 923                 else:
 924                     print_error("removing orphaned tx from history", tx_hash)
 925                     self.transactions.pop(tx_hash)
 926
 927         return True
 928
 929     def check_new_tx(self, tx_hash, tx):
 930         # 1 check that tx is referenced in addr_history.
 931         addresses = []
 932         for addr, hist in self.history.items():
 933             if hist == ['*']:continue
 934             for txh, height in hist:
 935                 if txh == tx_hash:
 936                     addresses.append(addr)
 937
 938         if not addresses:
 939             return False
 940
 941         # 2 check that referencing addresses are in the tx
 942         for addr in addresses:
 943             if not tx.has_address(addr):
 944                 return False
 945
 946         return True
 947
 948     def start_threads(self, network):
 949         from verifier import TxVerifier
 950         self.network = network
 951         if self.network is not None:
 952             self.verifier = TxVerifier(self.network, self.storage)
 953             self.verifier.start()
 954             self.set_verifier(self.verifier)
 955             self.synchronizer = WalletSynchronizer(self, network)
 956             self.synchronizer.start()
 957         else:
 958             self.verifier = None
 959             self.synchronizer =None
 960
 961     def stop_threads(self):
 962         if self.network:
 963             self.verifier.stop()
 964             self.synchronizer.stop()
 965
 966     def restore(self, cb):
 967         pass
 968
 969     def get_accounts(self):
 970         return self.accounts
 971
 972     def save_accounts(self):
 973         d = {}
 974         for k, v in self.accounts.items():
 975             d[k] = v.dump()
 976         self.storage.put('accounts', d, True)
 977
 978     def can_import(self):
 979         return not self.is_watching_only()
 980
 981     def is_used(self, address):
 982         h = self.history.get(address,[])
 983         c, u = self.get_addr_balance(address)
 984         return len(h), len(h) > 0 and c == -u
 985
 986     def address_is_old(self, address, age_limit=2):
 987         age = -1
 988         h = self.history.get(address, [])
 989         if h == ['*']:
 990             return True
 991         for tx_hash, tx_height in h:
 992             if tx_height == 0:
 993                 tx_age = 0
 994             else:
 995                 tx_age = self.network.get_local_height() - tx_height + 1
 996             if tx_age > age:
 997                 age = tx_age
 998         return age > age_limit
 999
1000
1001 class Imported_Wallet(Abstract_Wallet):
1002
1003     def __init__(self, storage):
1004         Abstract_Wallet.__init__(self, storage)
1005         a = self.accounts.get(IMPORTED_ACCOUNT)
1006         if not a:
1007             self.accounts[IMPORTED_ACCOUNT] = ImportedAccount({'imported':{}})
1008         self.storage.put('wallet_type', 'imported', True)
1009
1010     def is_watching_only(self):
1011         acc = self.accounts[IMPORTED_ACCOUNT]
1012         n = acc.keypairs.values()
1013         return n == [(None, None)] * len(n)
1014
1015     def has_seed(self):
1016         return False
1017
1018     def is_deterministic(self):
1019         return False
1020
1021     def check_password(self, password):
1022         self.accounts[IMPORTED_ACCOUNT].get_private_key((0,0), self, password)
1023
1024     def is_used(self, address):
1025         h = self.history.get(address,[])
1026         return len(h), False
1027
1028     def get_master_public_keys(self):
1029         return {}
1030
1031     def is_beyond_limit(self, address, account, is_change):
1032         return False
1033
1034
1035 class Deterministic_Wallet(Abstract_Wallet):
1036
1037     def __init__(self, storage):
1038         Abstract_Wallet.__init__(self, storage)
1039
1040     def has_seed(self):
1041         return self.seed != ''
1042
1043     def is_deterministic(self):
1044         return True
1045
1046     def is_watching_only(self):
1047         return not self.has_seed()
1048
1049     def add_seed(self, seed, password):
1050         if self.seed:
1051             raise Exception("a seed exists")
1052
1053         self.seed_version, self.seed = self.prepare_seed(seed)
1054         if password:
1055             self.seed = pw_encode( self.seed, password)
1056             self.use_encryption = True
1057         else:
1058             self.use_encryption = False
1059
1060         self.storage.put('seed', self.seed, True)
1061         self.storage.put('seed_version', self.seed_version, True)
1062         self.storage.put('use_encryption', self.use_encryption,True)
1063         self.create_master_keys(password)
1064
1065     def get_seed(self, password):
1066         return pw_decode(self.seed, password)
1067
1068     def get_mnemonic(self, password):
1069         return self.get_seed(password)
1070
1071     def change_gap_limit(self, value):
1072         if value >= self.gap_limit:
1073             self.gap_limit = value
1074             self.storage.put('gap_limit', self.gap_limit, True)
1075             #self.interface.poke('synchronizer')
1076             return True
1077
1078         elif value >= self.min_acceptable_gap():
1079             for key, account in self.accounts.items():
1080                 addresses = account[0]
1081                 k = self.num_unused_trailing_addresses(addresses)
1082                 n = len(addresses) - k + value
1083                 addresses = addresses[0:n]
1084                 self.accounts[key][0] = addresses
1085
1086             self.gap_limit = value
1087             self.storage.put('gap_limit', self.gap_limit, True)
1088             self.save_accounts()
1089             return True
1090         else:
1091             return False
1092
1093     def num_unused_trailing_addresses(self, addresses):
1094         k = 0
1095         for a in addresses[::-1]:
1096             if self.history.get(a):break
1097             k = k + 1
1098         return k
1099
1100     def min_acceptable_gap(self):
1101         # fixme: this assumes wallet is synchronized
1102         n = 0
1103         nmax = 0
1104
1105         for account in self.accounts.values():
1106             addresses = account.get_addresses(0)
1107             k = self.num_unused_trailing_addresses(addresses)
1108             for a in addresses[0:-k]:
1109                 if self.history.get(a):
1110                     n = 0
1111                 else:
1112                     n += 1
1113                     if n > nmax: nmax = n
1114         return nmax + 1
1115
1116     def create_new_address(self, account=None, for_change=0):
1117         if account is None:
1118             account = self.default_account()
1119         address = account.create_new_address(for_change)
1120         self.history[address] = []
1121         if self.synchronizer:
1122             self.synchronizer.add(address)
1123         self.save_accounts()
1124         return address
1125
1126     def synchronize_sequence(self, account, for_change):
1127         limit = self.gap_limit_for_change if for_change else self.gap_limit
1128         while True:
1129             addresses = account.get_addresses(for_change)
1130             if len(addresses) < limit:
1131                 self.create_new_address(account, for_change)
1132                 continue
1133             if map( lambda a: self.address_is_old(a), addresses[-limit:] ) == limit*[False]:
1134                 break
1135             else:
1136                 self.create_new_address(account, for_change)
1137
1138     def check_pending_accounts(self):
1139         for account_id, addr in self.next_addresses.items():
1140             if self.address_is_old(addr):
1141                 print_error( "creating account", account_id )
1142                 xpub = self.master_public_keys[account_id]
1143                 account = BIP32_Account({'xpub':xpub})
1144                 self.add_account(account_id, account)
1145                 self.next_addresses.pop(account_id)
1146
1147     def synchronize_account(self, account):
1148         self.synchronize_sequence(account, 0)
1149         self.synchronize_sequence(account, 1)
1150
1151     def synchronize(self):
1152         self.check_pending_accounts()
1153         for account in self.accounts.values():
1154             if type(account) in [ImportedAccount, PendingAccount]:
1155                 continue
1156             self.synchronize_account(account)
1157
1158     def restore(self, callback):
1159         from i18n import _
1160         def wait_for_wallet():
1161             self.set_up_to_date(False)
1162             while not self.is_up_to_date():
1163                 msg = "%s\n%s %d\n%s %.1f"%(
1164                     _("Please wait..."),
1165                     _("Addresses generated:"),
1166                     len(self.addresses(True)),
1167                     _("Kilobytes received:"),
1168                     self.network.interface.bytes_received/1024.)
1169
1170                 apply(callback, (msg,))
1171                 time.sleep(0.1)
1172
1173         def wait_for_network():
1174             while not self.network.is_connected():
1175                 msg = "%s \n" % (_("Connecting..."))
1176                 apply(callback, (msg,))
1177                 time.sleep(0.1)
1178
1179         # wait until we are connected, because the user might have selected another server
1180         if self.network:
1181             wait_for_network()
1182             wait_for_wallet()
1183         else:
1184             self.synchronize()
1185         self.fill_addressbook()
1186
1187     def create_account(self, name, password):
1188         i = self.num_accounts()
1189         account_id = self.account_id(i)
1190         account = self.make_account(account_id, password)
1191         self.add_account(account_id, account)
1192         if name:
1193             self.set_label(account_id, name)
1194
1195         # add address of the next account
1196         _, _ = self.next_account_address(password)
1197
1198
1199     def add_account(self, account_id, account):
1200         self.accounts[account_id] = account
1201         self.save_accounts()
1202
1203     def account_is_pending(self, k):
1204         return type(self.accounts.get(k)) == PendingAccount
1205
1206     def delete_pending_account(self, k):
1207         assert self.account_is_pending(k)
1208         self.accounts.pop(k)
1209         self.save_accounts()
1210
1211     def create_pending_account(self, name, password):
1212         account_id, addr = self.next_account_address(password)
1213         self.set_label(account_id, name)
1214         self.accounts[account_id] = PendingAccount({'pending':addr})
1215         self.save_accounts()
1216
1217     def is_beyond_limit(self, address, account, is_change):
1218         if type(account) == ImportedAccount:
1219             return False
1220         addr_list = account.get_addresses(is_change)
1221         i = addr_list.index(address)
1222         prev_addresses = addr_list[:max(0, i)]
1223         limit = self.gap_limit_for_change if is_change else self.gap_limit
1224         if len(prev_addresses) < limit:
1225             return False
1226         prev_addresses = prev_addresses[max(0, i - limit):]
1227         for addr in prev_addresses:
1228             if self.history.get(addr):
1229                 return False
1230         return True
1231
1232     def get_action(self):
1233         if not self.get_master_public_key():
1234             return 'create_seed'
1235         if not self.accounts:
1236             return 'create_accounts'
1237
1238
1239 class NewWallet(Deterministic_Wallet):
1240
1241     def __init__(self, storage):
1242         Deterministic_Wallet.__init__(self, storage)
1243         self.master_public_keys  = storage.get('master_public_keys', {})
1244         self.master_private_keys = storage.get('master_private_keys', {})
1245
1246     def default_account(self):
1247         return self.accounts["m/0'"]
1248
1249     def is_watching_only(self):
1250         return not bool(self.master_private_keys)
1251
1252     def can_create_accounts(self):
1253         return 'm/' in self.master_private_keys.keys()
1254
1255     def get_master_public_key(self):
1256         """xpub of the main account"""
1257         return self.master_public_keys.get("m/0'")
1258
1259     def get_master_public_keys(self):
1260         out = {}
1261         for k, account in self.accounts.items():
1262             name = self.get_account_name(k)
1263             mpk_text = '\n\n'.join( account.get_master_pubkeys() )
1264             out[name] = mpk_text
1265         return out
1266
1267     def get_master_private_key(self, account, password):
1268         k = self.master_private_keys.get(account)
1269         if not k: return
1270         xpriv = pw_decode( k, password)
1271         return xpriv
1272
1273     def check_password(self, password):
1274         xpriv = self.get_master_private_key( "m/", password )
1275         xpub = self.master_public_keys["m/"]
1276         assert deserialize_xkey(xpriv)[3] == deserialize_xkey(xpub)[3]
1277
1278     def create_xprv_wallet(self, xprv, password):
1279         xpub = bitcoin.xpub_from_xprv(xprv)
1280         account = BIP32_Account({'xpub':xpub})
1281         account_id = 'm/' + bitcoin.get_xkey_name(xpub)
1282         self.storage.put('seed_version', self.seed_version, True)
1283         self.add_master_private_key(account_id, xprv, password)
1284         self.add_master_public_key(account_id, xpub)
1285         self.add_account(account_id, account)
1286
1287     def create_watching_only_wallet(self, xpub):
1288         account = BIP32_Account({'xpub':xpub})
1289         account_id = 'm/' + bitcoin.get_xkey_name(xpub)
1290         self.storage.put('seed_version', self.seed_version, True)
1291         self.add_master_public_key(account_id, xpub)
1292         self.add_account(account_id, account)
1293
1294     def create_accounts(self, password):
1295         # First check the password is valid (this raises if it isn't).
1296         if not self.is_watching_only():
1297             self.check_password(password)
1298         self.create_account('Main account', password)
1299
1300     def add_master_public_key(self, name, xpub):
1301         self.master_public_keys[name] = xpub
1302         self.storage.put('master_public_keys', self.master_public_keys, True)
1303
1304     def add_master_private_key(self, name, xpriv, password):
1305         self.master_private_keys[name] = pw_encode(xpriv, password)
1306         self.storage.put('master_private_keys', self.master_private_keys, True)
1307
1308     def add_master_keys(self, root, account_id, password):
1309         x = self.master_private_keys.get(root)
1310         if x:
1311             master_xpriv = pw_decode(x, password )
1312             xpriv, xpub = bip32_private_derivation(master_xpriv, root, account_id)
1313             self.add_master_public_key(account_id, xpub)
1314             self.add_master_private_key(account_id, xpriv, password)
1315         else:
1316             master_xpub = self.master_public_keys[root]
1317             xpub = bip32_public_derivation(master_xpub, root, account_id)
1318             self.add_master_public_key(account_id, xpub)
1319         return xpub
1320
1321     def create_master_keys(self, password):
1322         xpriv, xpub = bip32_root(mnemonic_to_seed(self.get_seed(password),'').encode('hex'))
1323         self.add_master_public_key("m/", xpub)
1324         self.add_master_private_key("m/", xpriv, password)
1325
1326     def can_sign(self, tx):
1327         if self.is_watching_only():
1328             return False
1329         if tx.is_complete():
1330             return False
1331         addr_list, xpub_list = tx.inputs_to_sign()
1332         for addr in addr_list:
1333             if self.is_mine(addr):
1334                 return True
1335         mpk = [ self.master_public_keys[k] for k in self.master_private_keys.keys() ]
1336         for xpub, sequence in xpub_list:
1337             if xpub in mpk:
1338                 return True
1339         return False
1340
1341     def find_root_by_master_key(self, xpub):
1342         for key, xpub2 in self.master_public_keys.items():
1343             if key == "m/":continue
1344             if xpub == xpub2:
1345                 return key
1346
1347     def num_accounts(self):
1348         keys = []
1349         for k, v in self.accounts.items():
1350             if type(v) != BIP32_Account:
1351                 continue
1352             keys.append(k)
1353
1354         i = 0
1355         while True:
1356             account_id = self.account_id(i)
1357             if account_id not in keys: break
1358             i += 1
1359         return i
1360
1361     def next_account_address(self, password):
1362         i = self.num_accounts()
1363         account_id = self.account_id(i)
1364
1365         addr = self.next_addresses.get(account_id)
1366         if not addr:
1367             account = self.make_account(account_id, password)
1368             addr = account.first_address()
1369             self.next_addresses[account_id] = addr
1370             self.storage.put('next_addresses', self.next_addresses)
1371
1372         return account_id, addr
1373
1374     def account_id(self, i):
1375         return "m/%d'"%i
1376
1377     def make_account(self, account_id, password):
1378         """Creates and saves the master keys, but does not save the account"""
1379         xpub = self.add_master_keys("m/", account_id, password)
1380         account = BIP32_Account({'xpub':xpub})
1381         return account
1382
1383     def make_seed(self):
1384         import mnemonic, ecdsa
1385         entropy = ecdsa.util.randrange( pow(2,160) )
1386         nonce = 0
1387         while True:
1388             ss = "%040x"%(entropy+nonce)
1389             s = hashlib.sha256(ss.decode('hex')).digest().encode('hex')
1390             # we keep only 13 words, that's approximately 139 bits of entropy
1391             words = mnemonic.mn_encode(s)[0:13]
1392             seed = ' '.join(words)
1393             if is_new_seed(seed):
1394                 break  # this will remove 8 bits of entropy
1395             nonce += 1
1396         return seed
1397
1398     def prepare_seed(self, seed):
1399         import unicodedata
1400         return NEW_SEED_VERSION, unicodedata.normalize('NFC', unicode(seed.strip()))
1401
1402
1403 class Wallet_2of2(NewWallet):
1404     """ This class is used for multisignature addresses"""
1405
1406     def __init__(self, storage):
1407         NewWallet.__init__(self, storage)
1408         self.storage.put('wallet_type', '2of2', True)
1409
1410     def default_account(self):
1411         return self.accounts['m/']
1412
1413     def can_create_accounts(self):
1414         return False
1415
1416     def can_import(self):
1417         return False
1418
1419     def create_account(self, name, password):
1420         xpub1 = self.master_public_keys.get("m/")
1421         xpub2 = self.master_public_keys.get("cold/")
1422         account = BIP32_Account_2of2({'xpub':xpub1, 'xpub2':xpub2})
1423         self.add_account('m/', account)
1424
1425     def get_master_public_keys(self):
1426         xpub1 = self.master_public_keys.get("m/")
1427         xpub2 = self.master_public_keys.get("cold/")
1428         return {'hot':xpub1, 'cold':xpub2}
1429
1430     def get_action(self):
1431         xpub1 = self.master_public_keys.get("m/")
1432         xpub2 = self.master_public_keys.get("cold/")
1433         if xpub1 is None:
1434             return 'create_seed'
1435         if xpub2 is None:
1436             return 'add_cosigner'
1437         if not self.accounts:
1438             return 'create_accounts'
1439
1440
1441 class Wallet_2of3(Wallet_2of2):
1442     """ This class is used for multisignature addresses"""
1443
1444     def __init__(self, storage):
1445         Wallet_2of2.__init__(self, storage)
1446         self.storage.put('wallet_type', '2of3', True)
1447
1448     def create_account(self, name, password):
1449         xpub1 = self.master_public_keys.get("m/")
1450         xpub2 = self.master_public_keys.get("cold/")
1451         xpub3 = self.master_public_keys.get("remote/")
1452         account = BIP32_Account_2of3({'xpub':xpub1, 'xpub2':xpub2, 'xpub3':xpub3})
1453         self.add_account('m/', account)
1454
1455     def get_master_public_keys(self):
1456         xpub1 = self.master_public_keys.get("m/")
1457         xpub2 = self.master_public_keys.get("cold/")
1458         xpub3 = self.master_public_keys.get("remote/")
1459         return {'hot':xpub1, 'cold':xpub2, 'remote':xpub3}
1460
1461     def get_action(self):
1462         xpub1 = self.master_public_keys.get("m/")
1463         xpub2 = self.master_public_keys.get("cold/")
1464         xpub3 = self.master_public_keys.get("remote/")
1465         if xpub1 is None:
1466             return 'create_seed'
1467         if xpub2 is None or xpub3 is None:
1468             return 'add_two_cosigners'
1469         if not self.accounts:
1470             return 'create_accounts'
1471
1472
1473 class OldWallet(Deterministic_Wallet):
1474
1475     def default_account(self):
1476         return self.accounts[0]
1477
1478     def make_seed(self):
1479         import mnemonic
1480         seed = random_seed(128)
1481         return ' '.join(mnemonic.mn_encode(seed))
1482
1483     def prepare_seed(self, seed):
1484         import mnemonic
1485         # see if seed was entered as hex
1486         seed = seed.strip()
1487         try:
1488             assert seed
1489             seed.decode('hex')
1490             return OLD_SEED_VERSION, str(seed)
1491         except Exception:
1492             pass
1493
1494         words = seed.split()
1495         seed = mnemonic.mn_decode(words)
1496         if not seed:
1497             raise Exception("Invalid seed")
1498
1499         return OLD_SEED_VERSION, seed
1500
1501     def create_master_keys(self, password):
1502         seed = self.get_seed(password)
1503         mpk = OldAccount.mpk_from_seed(seed)
1504         self.storage.put('master_public_key', mpk, True)
1505
1506     def get_master_public_key(self):
1507         return self.storage.get("master_public_key")
1508
1509     def get_master_public_keys(self):
1510         return {'Main Account':self.get_master_public_key()}
1511
1512     def create_accounts(self, password):
1513         mpk = self.storage.get("master_public_key")
1514         self.create_account(mpk)
1515
1516     def create_account(self, mpk):
1517         self.accounts[0] = OldAccount({'mpk':mpk, 0:[], 1:[]})
1518         self.save_accounts()
1519
1520     def create_watching_only_wallet(self, mpk):
1521         self.seed_version = OLD_SEED_VERSION
1522         self.storage.put('seed_version', self.seed_version, True)
1523         self.storage.put('master_public_key', mpk, True)
1524         self.create_account(mpk)
1525
1526     def get_seed(self, password):
1527         seed = pw_decode(self.seed, password).encode('utf8')
1528         return seed
1529
1530     def check_password(self, password):
1531         seed = self.get_seed(password)
1532         self.accounts[0].check_seed(seed)
1533
1534     def get_mnemonic(self, password):
1535         import mnemonic
1536         s = self.get_seed(password)
1537         return ' '.join(mnemonic.mn_encode(s))
1538
1539     def check_pending_accounts(self):
1540         pass
1541
1542     def can_sign(self, tx):
1543         if self.is_watching_only():
1544             return False
1545         if tx.is_complete():
1546             return False
1547         addr_list, xpub_list = tx.inputs_to_sign()
1548         for addr in addr_list:
1549             if self.is_mine(addr):
1550                 return True
1551         for xpub, sequence in xpub_list:
1552             if xpub == self.master_public_key:
1553                 return True
1554         return False
1555
1556 # former WalletFactory
1557 class Wallet(object):
1558     """The main wallet "entry point".
1559     This class is actually a factory that will return a wallet of the correct
1560     type when passed a WalletStorage instance."""
1561
1562     def __new__(self, storage):
1563         config = storage.config
1564
1565         self.wallet_types = [
1566             ('standard', ("Standard wallet"),          NewWallet if config.get('bip32') else OldWallet),
1567             ('imported', ("Imported wallet"),          Imported_Wallet),
1568             ('2of2',     ("Multisig wallet (2 of 2)"), Wallet_2of2),
1569             ('2of3',     ("Multisig wallet (2 of 3)"), Wallet_2of3)
1570         ]
1571         run_hook('add_wallet_types', self.wallet_types)
1572
1573         for t, l, WalletClass in self.wallet_types:
1574             if t == storage.get('wallet_type'):
1575                 return WalletClass(storage)
1576
1577         if not storage.file_exists:
1578             seed_version = NEW_SEED_VERSION if config.get('bip32') is True else OLD_SEED_VERSION
1579         else:
1580             seed_version = storage.get('seed_version')
1581             if not seed_version:
1582                 seed_version = OLD_SEED_VERSION if len(storage.get('master_public_key')) == 128 else NEW_SEED_VERSION
1583
1584         if seed_version == OLD_SEED_VERSION:
1585             return OldWallet(storage)
1586         elif seed_version == NEW_SEED_VERSION:
1587             return NewWallet(storage)
1588         else:
1589             msg = "This wallet seed is not supported."
1590             if seed_version in [5]:
1591                 msg += "\nTo open this wallet, try 'git checkout seed_v%d'"%seed_version
1592             print msg
1593             sys.exit(1)
1594
1595     @classmethod
1596     def is_seed(self, seed):
1597         if not seed:
1598             return False
1599         elif is_old_seed(seed):
1600             return True
1601         elif is_new_seed(seed):
1602             return True
1603         else:
1604             return False
1605
1606     @classmethod
1607     def is_old_mpk(self, mpk):
1608         try:
1609             int(mpk, 16)
1610             assert len(mpk) == 128
1611             return True
1612         except:
1613             return False
1614
1615     @classmethod
1616     def is_xpub(self, text):
1617         try:
1618             assert text[0:4] == 'xpub'
1619             deserialize_xkey(text)
1620             return True
1621         except:
1622             return False
1623
1624     @classmethod
1625     def is_xprv(self, text):
1626         try:
1627             assert text[0:4] == 'xprv'
1628             deserialize_xkey(text)
1629             return True
1630         except:
1631             return False
1632
1633     @classmethod
1634     def is_address(self, text):
1635         if not text:
1636             return False
1637         for x in text.split():
1638             if not bitcoin.is_address(x):
1639                 return False
1640         return True
1641
1642     @classmethod
1643     def is_private_key(self, text):
1644         if not text:
1645             return False
1646         for x in text.split():
1647             if not bitcoin.is_private_key(x):
1648                 return False
1649         return True
1650
1651     @classmethod
1652     def from_seed(self, seed, storage):
1653         if is_old_seed(seed):
1654             klass = OldWallet
1655         elif is_new_seed(seed):
1656             klass = NewWallet
1657         w = klass(storage)
1658         return w
1659
1660     @classmethod
1661     def from_address(self, text, storage):
1662         w = Imported_Wallet(storage)
1663         for x in text.split():
1664             w.accounts[IMPORTED_ACCOUNT].add(x, None, None, None)
1665         w.save_accounts()
1666         return w
1667
1668     @classmethod
1669     def from_private_key(self, text, storage):
1670         w = Imported_Wallet(storage)
1671         for x in text.split():
1672             w.import_key(x, None)
1673         return w
1674
1675     @classmethod
1676     def from_old_mpk(self, mpk, storage):
1677         w = OldWallet(storage)
1678         w.seed = ''
1679         w.create_watching_only_wallet(mpk)
1680         return w
1681
1682     @classmethod
1683     def from_xpub(self, xpub, storage):
1684         w = NewWallet(storage)
1685         w.create_watching_only_wallet(xpub)
1686         return w
1687
1688     @classmethod
1689     def from_xprv(self, xprv, password, storage):
1690         w = NewWallet(storage)
1691         w.create_xprv_wallet(xprv, password)
1692         return w