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