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
  47 class WalletStorage:
  48
  49     def __init__(self, config):
  50         self.lock = threading.Lock()
  51         self.config = config
  52         self.data = {}
  53         self.file_exists = False
  54         self.path = self.init_path(config)
  55         print_error( "wallet path", self.path )
  56         if self.path:
  57             self.read(self.path)
  58
  59
  60     def init_path(self, config):
  61         """Set the path of the wallet."""
  62
  63         # command line -w option
  64         path = config.get('wallet_path')
  65         if path:
  66             return path
  67
  68         # path in config file
  69         path = config.get('default_wallet_path')
  70         if path:
  71             return path
  72
  73         # default path
  74         dirpath = os.path.join(config.path, "wallets")
  75         if not os.path.exists(dirpath):
  76             os.mkdir(dirpath)
  77
  78         new_path = os.path.join(config.path, "wallets", "default_wallet")
  79
  80         # default path in pre 1.9 versions
  81         old_path = os.path.join(config.path, "electrum.dat")
  82         if os.path.exists(old_path) and not os.path.exists(new_path):
  83             os.rename(old_path, new_path)
  84
  85         return new_path
  86
  87
  88     def read(self, path):
  89         """Read the contents of the wallet file."""
  90         try:
  91             with open(self.path, "r") as f:
  92                 data = f.read()
  93         except IOError:
  94             return
  95         try:
  96             d = ast.literal_eval( data )  #parse raw data from reading wallet file
  97         except Exception:
  98             raise IOError("Cannot read wallet file.")
  99
 100         self.data = d
 101         self.file_exists = True
 102
 103
 104     def get(self, key, default=None):
 105         v = self.data.get(key)
 106         if v is None:
 107             v = default
 108         return v
 109
 110     def put(self, key, value, save = True):
 111
 112         with self.lock:
 113             if value is not None:
 114                 self.data[key] = value
 115             elif key in self.data:
 116                 self.data.pop(key)
 117             if save:
 118                 self.write()
 119
 120     def write(self):
 121         s = repr(self.data)
 122         f = open(self.path,"w")
 123         f.write( s )
 124         f.close()
 125         if 'ANDROID_DATA' not in os.environ:
 126             import stat
 127             os.chmod(self.path,stat.S_IREAD | stat.S_IWRITE)
 128
 129
 130 class Abstract_Wallet:
 131
 132     def __init__(self, storage):
 133         self.storage = storage
 134         self.electrum_version = ELECTRUM_VERSION
 135         self.gap_limit_for_change = 3 # constant
 136         # saved fields
 137         self.seed_version          = storage.get('seed_version', NEW_SEED_VERSION)
 138         self.gap_limit             = storage.get('gap_limit', 5)
 139         self.use_change            = storage.get('use_change',True)
 140         self.use_encryption        = storage.get('use_encryption', False)
 141         self.seed                  = storage.get('seed', '')               # encrypted
 142         self.labels                = storage.get('labels', {})
 143         self.frozen_addresses      = storage.get('frozen_addresses',[])
 144         self.addressbook           = storage.get('contacts', [])
 145
 146         self.history               = storage.get('addr_history',{})        # address -> list(txid, height)
 147
 148         self.fee                   = int(storage.get('fee_per_kb', 10000))
 149
 150         self.master_public_keys = storage.get('master_public_keys',{})
 151         self.master_private_keys = storage.get('master_private_keys', {})
 152
 153         self.next_addresses = storage.get('next_addresses',{})
 154
 155
 156         # This attribute is set when wallet.start_threads is called.
 157         self.synchronizer = None
 158
 159         self.load_accounts()
 160
 161         self.transactions = {}
 162         tx_list = self.storage.get('transactions',{})
 163         for k,v in tx_list.items():
 164             try:
 165                 tx = Transaction(v)
 166             except Exception:
 167                 print_msg("Warning: Cannot deserialize transactions. skipping")
 168                 continue
 169
 170             self.add_extra_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
 179         # not saved
 180         self.prevout_values = {}     # my own transaction outputs
 181         self.spent_outputs = []
 182
 183         # spv
 184         self.verifier = None
 185
 186         # there is a difference between wallet.up_to_date and interface.is_up_to_date()
 187         # interface.is_up_to_date() returns true when all requests have been answered and processed
 188         # wallet.up_to_date is true when the wallet is synchronized (stronger requirement)
 189
 190         self.up_to_date = False
 191         self.lock = threading.Lock()
 192         self.transaction_lock = threading.Lock()
 193         self.tx_event = threading.Event()
 194         for tx_hash, tx in self.transactions.items():
 195             self.update_tx_outputs(tx_hash)
 196
 197     def add_extra_addresses(self, tx):
 198         h = tx.hash()
 199         # find the address corresponding to pay-to-pubkey inputs
 200         tx.add_extra_addresses(self.transactions)
 201         for o in tx.d.get('outputs'):
 202             if o.get('is_pubkey'):
 203                 for tx2 in self.transactions.values():
 204                     tx2.add_extra_addresses({h:tx})
 205
 206     def get_action(self):
 207         pass
 208
 209     def convert_imported_keys(self, password):
 210         for k, v in self.imported_keys.items():
 211             sec = pw_decode(v, password)
 212             pubkey = public_key_from_private_key(sec)
 213             address = public_key_to_bc_address(pubkey.decode('hex'))
 214             assert address == k
 215             self.import_key(sec, password)
 216             self.imported_keys.pop(k)
 217         self.storage.put('imported_keys', self.imported_keys)
 218
 219     def load_accounts(self):
 220         self.accounts = {}
 221         self.imported_keys = self.storage.get('imported_keys',{})
 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
 335         for account in self.accounts.keys():
 336             for for_change in [0,1]:
 337                 addresses = self.accounts[account].get_addresses(for_change)
 338                 for addr in addresses:
 339                     if address == addr:
 340                         return account, (for_change, addresses.index(addr))
 341
 342         for k,v in self.next_addresses.items():
 343             if v == address:
 344                 return k, (0,0)
 345
 346         raise Exception("Address not found", address)
 347
 348     def getpubkeys(self, addr):
 349         assert is_valid(addr) and self.is_mine(addr)
 350         account, sequence = self.get_address_index(addr)
 351         a = self.accounts[account]
 352         return a.get_pubkeys( sequence )
 353
 354     def get_private_key(self, address, password):
 355         if self.is_watching_only():
 356             return []
 357         account_id, sequence = self.get_address_index(address)
 358         return self.accounts[account_id].get_private_key(sequence, self, password)
 359
 360     def get_public_keys(self, address):
 361         account_id, sequence = self.get_address_index(address)
 362         return self.accounts[account_id].get_pubkeys(sequence)
 363
 364     def can_sign(self, tx):
 365
 366         if self.is_watching_only():
 367             return False
 368
 369         if tx.is_complete():
 370             return False
 371
 372         addr_list, xpub_list = tx.inputs_to_sign()
 373         for addr in addr_list:
 374             if self.is_mine(addr):
 375                 return True
 376
 377         mpk = [ self.master_public_keys[k] for k in self.master_private_keys.keys() ]
 378         for xpub, sequence in xpub_list:
 379             if xpub in mpk:
 380                 return True
 381
 382         return False
 383
 384     def add_keypairs(self, tx, keypairs, password):
 385         # first check the provided password. This will raise if invalid.
 386         self.check_password(password)
 387
 388         addr_list, xpub_list = tx.inputs_to_sign()
 389         for addr in addr_list:
 390             if self.is_mine(addr):
 391                 private_keys = self.get_private_key(addr, password)
 392                 for sec in private_keys:
 393                     pubkey = public_key_from_private_key(sec)
 394                     keypairs[ pubkey ] = sec
 395
 396         for xpub, sequence in xpub_list:
 397             # look for account that can sign
 398             for k, account in self.accounts.items():
 399                 if xpub in account.get_master_pubkeys():
 400                     break
 401             else:
 402                 continue
 403
 404             addr = account.get_address(*sequence)
 405             pk = self.get_private_key(addr, password)
 406             for sec in pk:
 407                 pubkey = public_key_from_private_key(sec)
 408                 keypairs[pubkey] = sec
 409
 410     def signrawtransaction(self, tx, private_keys, password):
 411         # check that the password is correct. This will raise if it's not.
 412         self.get_seed(password)
 413
 414         # build a list of public/private keys
 415         keypairs = {}
 416
 417         # add private keys from parameter
 418         for sec in private_keys:
 419             pubkey = public_key_from_private_key(sec)
 420             keypairs[ pubkey ] = sec
 421
 422         # add private_keys
 423         self.add_keypairs(tx, keypairs, password)
 424
 425         # sign the transaction
 426         self.sign_transaction(tx, keypairs, password)
 427
 428     def sign_message(self, address, message, password):
 429         keys = self.get_private_key(address, password)
 430         assert len(keys) == 1
 431         sec = keys[0]
 432         key = regenerate_key(sec)
 433         compressed = is_compressed(sec)
 434         return key.sign_message(message, compressed, address)
 435
 436     def decrypt_message(self, pubkey, message, password):
 437         address = public_key_to_bc_address(pubkey.decode('hex'))
 438         keys = self.get_private_key(address, password)
 439         secret = keys[0]
 440         ec = regenerate_key(secret)
 441         decrypted = ec.decrypt_message(message)
 442         return decrypted
 443
 444     def is_found(self):
 445         return self.history.values() != [[]] * len(self.history)
 446
 447     def add_contact(self, address, label=None):
 448         self.addressbook.append(address)
 449         self.storage.put('contacts', self.addressbook, True)
 450         if label:
 451             self.set_label(address, label)
 452
 453     def delete_contact(self, addr):
 454         if addr in self.addressbook:
 455             self.addressbook.remove(addr)
 456             self.storage.put('addressbook', self.addressbook, True)
 457
 458     def fill_addressbook(self):
 459         for tx_hash, tx in self.transactions.items():
 460             is_relevant, is_send, _, _ = self.get_tx_value(tx)
 461             if is_send:
 462                 for addr, v in tx.outputs:
 463                     if not self.is_mine(addr) and addr not in self.addressbook:
 464                         self.addressbook.append(addr)
 465         # redo labels
 466         # self.update_tx_labels()
 467
 468     def get_num_tx(self, address):
 469         n = 0
 470         for tx in self.transactions.values():
 471             if address in map(lambda x:x[0], tx.outputs): n += 1
 472         return n
 473
 474     def get_address_flags(self, addr):
 475         flags = "C" if self.is_change(addr) else "I" if addr in self.imported_keys.keys() else "-"
 476         flags += "F" if addr in self.frozen_addresses else "-"
 477         return flags
 478
 479     def get_tx_value(self, tx, account=None):
 480         domain = self.get_account_addresses(account)
 481         return tx.get_value(domain, self.prevout_values)
 482
 483     def update_tx_outputs(self, tx_hash):
 484         tx = self.transactions.get(tx_hash)
 485
 486         for i, (addr, value) in enumerate(tx.outputs):
 487             key = tx_hash+ ':%d'%i
 488             self.prevout_values[key] = value
 489
 490         for item in tx.inputs:
 491             if self.is_mine(item.get('address')):
 492                 key = item['prevout_hash'] + ':%d'%item['prevout_n']
 493                 self.spent_outputs.append(key)
 494
 495     def get_addr_balance(self, address):
 496         #assert self.is_mine(address)
 497         h = self.history.get(address,[])
 498         if h == ['*']: return 0,0
 499         c = u = 0
 500         received_coins = []   # list of coins received at address
 501
 502         for tx_hash, tx_height in h:
 503             tx = self.transactions.get(tx_hash)
 504             if not tx: continue
 505
 506             for i, (addr, value) in enumerate(tx.outputs):
 507                 if addr == address:
 508                     key = tx_hash + ':%d'%i
 509                     received_coins.append(key)
 510
 511         for tx_hash, tx_height in h:
 512             tx = self.transactions.get(tx_hash)
 513             if not tx: continue
 514             v = 0
 515
 516             for item in tx.inputs:
 517                 addr = item.get('address')
 518                 if addr == address:
 519                     key = item['prevout_hash']  + ':%d'%item['prevout_n']
 520                     value = self.prevout_values.get( key )
 521                     if key in received_coins:
 522                         v -= value
 523
 524             for i, (addr, value) in enumerate(tx.outputs):
 525                 key = tx_hash + ':%d'%i
 526                 if addr == address:
 527                     v += value
 528
 529             if tx_height:
 530                 c += v
 531             else:
 532                 u += v
 533         return c, u
 534
 535     def get_account_name(self, k):
 536         return self.labels.get(k, self.accounts[k].get_name(k))
 537
 538     def get_account_names(self):
 539         account_names = {}
 540         for k in self.accounts.keys():
 541             account_names[k] = self.get_account_name(k)
 542         return account_names
 543
 544     def get_account_addresses(self, a, include_change=True):
 545         if a is None:
 546             o = self.addresses(True)
 547         elif a in self.accounts:
 548             ac = self.accounts[a]
 549             o = ac.get_addresses(0)
 550             if include_change: o += ac.get_addresses(1)
 551         return o
 552
 553     def get_account_balance(self, account):
 554         return self.get_balance(self.get_account_addresses(account))
 555
 556     def get_frozen_balance(self):
 557         return self.get_balance(self.frozen_addresses)
 558
 559     def get_balance(self, domain=None):
 560         if domain is None: domain = self.addresses(True)
 561         cc = uu = 0
 562         for addr in domain:
 563             c, u = self.get_addr_balance(addr)
 564             cc += c
 565             uu += u
 566         return cc, uu
 567
 568     def get_unspent_coins(self, domain=None):
 569         coins = []
 570         if domain is None: domain = self.addresses(True)
 571         for addr in domain:
 572             h = self.history.get(addr, [])
 573             if h == ['*']: continue
 574             for tx_hash, tx_height in h:
 575                 tx = self.transactions.get(tx_hash)
 576                 if tx is None: raise Exception("Wallet not synchronized")
 577                 is_coinbase = tx.inputs[0].get('prevout_hash') == '0'*64
 578                 for o in tx.d.get('outputs'):
 579                     output = o.copy()
 580                     if output.get('address') != addr: continue
 581                     key = tx_hash + ":%d" % output.get('prevout_n')
 582                     if key in self.spent_outputs: continue
 583                     output['prevout_hash'] = tx_hash
 584                     output['height'] = tx_height
 585                     output['coinbase'] = is_coinbase
 586                     coins.append((tx_height, output))
 587
 588         # sort by age
 589         if coins:
 590             coins = sorted(coins)
 591             if coins[-1][0] != 0:
 592                 while coins[0][0] == 0:
 593                     coins = coins[1:] + [ coins[0] ]
 594         return [x[1] for x in coins]
 595
 596     def choose_tx_inputs( self, amount, fixed_fee, num_outputs, domain = None, coins = None ):
 597         """ todo: minimize tx size """
 598         total = 0
 599         fee = self.fee if fixed_fee is None else fixed_fee
 600
 601         if not coins:
 602             if domain is None:
 603                 domain = self.addresses(True)
 604             for i in self.frozen_addresses:
 605                 if i in domain: domain.remove(i)
 606             coins = self.get_unspent_coins(domain)
 607
 608         inputs = []
 609
 610         for item in coins:
 611             if item.get('coinbase') and item.get('height') + COINBASE_MATURITY > self.network.get_local_height():
 612                 continue
 613             v = item.get('value')
 614             total += v
 615             inputs.append(item)
 616             fee = self.estimated_fee(inputs, num_outputs) if fixed_fee is None else fixed_fee
 617             if total >= amount + fee: break
 618         else:
 619             inputs = []
 620
 621         return inputs, total, fee
 622
 623     def set_fee(self, fee):
 624         if self.fee != fee:
 625             self.fee = fee
 626             self.storage.put('fee_per_kb', self.fee, True)
 627
 628     def estimated_fee(self, inputs, num_outputs):
 629         estimated_size =  len(inputs) * 180 + num_outputs * 34    # this assumes non-compressed keys
 630         fee = self.fee * int(math.ceil(estimated_size/1000.))
 631         return fee
 632
 633     def add_tx_change( self, inputs, outputs, amount, fee, total, change_addr=None):
 634         "add change to a transaction"
 635         change_amount = total - ( amount + fee )
 636         if change_amount > DUST_THRESHOLD:
 637             if not change_addr:
 638
 639                 # send change to one of the accounts involved in the tx
 640                 address = inputs[0].get('address')
 641                 account, _ = self.get_address_index(address)
 642
 643                 if not self.use_change or account == IMPORTED_ACCOUNT:
 644                     change_addr = inputs[-1]['address']
 645                 else:
 646                     change_addr = self.accounts[account].get_addresses(1)[-self.gap_limit_for_change]
 647
 648             # Insert the change output at a random position in the outputs
 649             posn = random.randint(0, len(outputs))
 650             outputs[posn:posn] = [( change_addr,  change_amount)]
 651         return outputs
 652
 653     def get_history(self, address):
 654         with self.lock:
 655             return self.history.get(address)
 656
 657     def get_status(self, h):
 658         if not h: return None
 659         if h == ['*']: return '*'
 660         status = ''
 661         for tx_hash, height in h:
 662             status += tx_hash + ':%d:' % height
 663         return hashlib.sha256( status ).digest().encode('hex')
 664
 665     def receive_tx_callback(self, tx_hash, tx, tx_height):
 666
 667         with self.transaction_lock:
 668             self.add_extra_addresses(tx)
 669             if not self.check_new_tx(tx_hash, tx):
 670                 # may happen due to pruning
 671                 print_error("received transaction that is no longer referenced in history", tx_hash)
 672                 return
 673             self.transactions[tx_hash] = tx
 674             self.network.pending_transactions_for_notifications.append(tx)
 675             self.save_transactions()
 676             if self.verifier and tx_height>0:
 677                 self.verifier.add(tx_hash, tx_height)
 678             self.update_tx_outputs(tx_hash)
 679
 680     def save_transactions(self):
 681         tx = {}
 682         for k,v in self.transactions.items():
 683             tx[k] = str(v)
 684         self.storage.put('transactions', tx, True)
 685
 686     def receive_history_callback(self, addr, hist):
 687
 688         if not self.check_new_history(addr, hist):
 689             raise Exception("error: received history for %s is not consistent with known transactions"%addr)
 690
 691         with self.lock:
 692             self.history[addr] = hist
 693             self.storage.put('addr_history', self.history, True)
 694
 695         if hist != ['*']:
 696             for tx_hash, tx_height in hist:
 697                 if tx_height>0:
 698                     # add it in case it was previously unconfirmed
 699                     if self.verifier: self.verifier.add(tx_hash, tx_height)
 700
 701     def get_tx_history(self, account=None):
 702         if not self.verifier:
 703             return []
 704
 705         with self.transaction_lock:
 706             history = self.transactions.items()
 707             history.sort(key = lambda x: self.verifier.get_txpos(x[0]))
 708             result = []
 709
 710             balance = 0
 711             for tx_hash, tx in history:
 712                 is_relevant, is_mine, v, fee = self.get_tx_value(tx, account)
 713                 if v is not None: balance += v
 714
 715             c, u = self.get_account_balance(account)
 716
 717             if balance != c+u:
 718                 result.append( ('', 1000, 0, c+u-balance, None, c+u-balance, None ) )
 719
 720             balance = c + u - balance
 721             for tx_hash, tx in history:
 722                 is_relevant, is_mine, value, fee = self.get_tx_value(tx, account)
 723                 if not is_relevant:
 724                     continue
 725                 if value is not None:
 726                     balance += value
 727
 728                 conf, timestamp = self.verifier.get_confirmations(tx_hash) if self.verifier else (None, None)
 729                 result.append( (tx_hash, conf, is_mine, value, fee, balance, timestamp) )
 730
 731         return result
 732
 733     def get_label(self, tx_hash):
 734         label = self.labels.get(tx_hash)
 735         is_default = (label == '') or (label is None)
 736         if is_default: label = self.get_default_label(tx_hash)
 737         return label, is_default
 738
 739     def get_default_label(self, tx_hash):
 740         tx = self.transactions.get(tx_hash)
 741         default_label = ''
 742         if tx:
 743             is_relevant, is_mine, _, _ = self.get_tx_value(tx)
 744             if is_mine:
 745                 for o in tx.outputs:
 746                     o_addr, _ = o
 747                     if not self.is_mine(o_addr):
 748                         try:
 749                             default_label = self.labels[o_addr]
 750                         except KeyError:
 751                             default_label = '>' + o_addr
 752                         break
 753                 else:
 754                     default_label = '(internal)'
 755             else:
 756                 for o in tx.outputs:
 757                     o_addr, _ = o
 758                     if self.is_mine(o_addr) and not self.is_change(o_addr):
 759                         break
 760                 else:
 761                     for o in tx.outputs:
 762                         o_addr, _ = o
 763                         if self.is_mine(o_addr):
 764                             break
 765                     else:
 766                         o_addr = None
 767
 768                 if o_addr:
 769                     try:
 770                         default_label = self.labels[o_addr]
 771                     except KeyError:
 772                         default_label = '<' + o_addr
 773
 774         return default_label
 775
 776     def make_unsigned_transaction(self, outputs, fee=None, change_addr=None, domain=None, coins=None ):
 777         for address, x in outputs:
 778             assert is_valid(address), "Address " + address + " is invalid!"
 779         amount = sum( map(lambda x:x[1], outputs) )
 780         inputs, total, fee = self.choose_tx_inputs( amount, fee, len(outputs), domain, coins )
 781         if not inputs:
 782             raise ValueError("Not enough funds")
 783         for txin in inputs:
 784             self.add_input_info(txin)
 785         outputs = self.add_tx_change(inputs, outputs, amount, fee, total, change_addr)
 786         return Transaction.from_io(inputs, outputs)
 787
 788     def mktx(self, outputs, password, fee=None, change_addr=None, domain= None, coins = None ):
 789         tx = self.make_unsigned_transaction(outputs, fee, change_addr, domain, coins)
 790         keypairs = {}
 791         self.add_keypairs(tx, keypairs, password)
 792         if keypairs:
 793             self.sign_transaction(tx, keypairs, password)
 794         return tx
 795
 796     def add_input_info(self, txin):
 797         address = txin['address']
 798         account_id, sequence = self.get_address_index(address)
 799         account = self.accounts[account_id]
 800         redeemScript = account.redeem_script(sequence)
 801         txin['x_pubkeys'] = account.get_xpubkeys(sequence)
 802         txin['pubkeys'] = pubkeys = account.get_pubkeys(sequence)
 803         txin['signatures'] = [None] * len(pubkeys)
 804
 805         if redeemScript:
 806             txin['redeemScript'] = redeemScript
 807             txin['num_sig'] = 2
 808         else:
 809             txin['redeemPubkey'] = account.get_pubkey(*sequence)
 810             txin['num_sig'] = 1
 811
 812     def sign_transaction(self, tx, keypairs, password):
 813         tx.sign(keypairs)
 814         run_hook('sign_transaction', tx, password)
 815
 816     def sendtx(self, tx):
 817         # synchronous
 818         h = self.send_tx(tx)
 819         self.tx_event.wait()
 820         return self.receive_tx(h, tx)
 821
 822     def send_tx(self, tx):
 823         # asynchronous
 824         self.tx_event.clear()
 825         self.network.send([('blockchain.transaction.broadcast', [str(tx)])], self.on_broadcast)
 826         return tx.hash()
 827
 828     def on_broadcast(self, i, r):
 829         self.tx_result = r.get('result')
 830         self.tx_event.set()
 831
 832     def receive_tx(self, tx_hash, tx):
 833         out = self.tx_result
 834         if out != tx_hash:
 835             return False, "error: " + out
 836         run_hook('receive_tx', tx, self)
 837         return True, out
 838
 839     def update_password(self, old_password, new_password):
 840         if new_password == '':
 841             new_password = None
 842
 843         if self.has_seed():
 844             decoded = self.get_seed(old_password)
 845             self.seed = pw_encode( decoded, new_password)
 846             self.storage.put('seed', self.seed, True)
 847
 848         imported_account = self.accounts.get(IMPORTED_ACCOUNT)
 849         if imported_account:
 850             imported_account.update_password(old_password, new_password)
 851             self.save_accounts()
 852
 853         for k, v in self.master_private_keys.items():
 854             b = pw_decode(v, old_password)
 855             c = pw_encode(b, new_password)
 856             self.master_private_keys[k] = c
 857         self.storage.put('master_private_keys', self.master_private_keys, True)
 858
 859         self.use_encryption = (new_password != None)
 860         self.storage.put('use_encryption', self.use_encryption,True)
 861
 862     def freeze(self,addr):
 863         if self.is_mine(addr) and addr not in self.frozen_addresses:
 864             self.frozen_addresses.append(addr)
 865             self.storage.put('frozen_addresses', self.frozen_addresses, True)
 866             return True
 867         else:
 868             return False
 869
 870     def unfreeze(self,addr):
 871         if self.is_mine(addr) and addr in self.frozen_addresses:
 872             self.frozen_addresses.remove(addr)
 873             self.storage.put('frozen_addresses', self.frozen_addresses, True)
 874             return True
 875         else:
 876             return False
 877
 878     def set_verifier(self, verifier):
 879         self.verifier = verifier
 880
 881         # review transactions that are in the history
 882         for addr, hist in self.history.items():
 883             if hist == ['*']: continue
 884             for tx_hash, tx_height in hist:
 885                 if tx_height>0:
 886                     # add it in case it was previously unconfirmed
 887                     self.verifier.add(tx_hash, tx_height)
 888
 889         # if we are on a pruning server, remove unverified transactions
 890         vr = self.verifier.transactions.keys() + self.verifier.verified_tx.keys()
 891         for tx_hash in self.transactions.keys():
 892             if tx_hash not in vr:
 893                 self.transactions.pop(tx_hash)
 894
 895     def check_new_history(self, addr, hist):
 896         # check that all tx in hist are relevant
 897         if hist != ['*']:
 898             for tx_hash, height in hist:
 899                 tx = self.transactions.get(tx_hash)
 900                 if not tx: continue
 901                 if not tx.has_address(addr):
 902                     return False
 903
 904         # check that we are not "orphaning" a transaction
 905         old_hist = self.history.get(addr,[])
 906         if old_hist == ['*']: return True
 907
 908         for tx_hash, height in old_hist:
 909             if tx_hash in map(lambda x:x[0], hist): continue
 910             found = False
 911             for _addr, _hist in self.history.items():
 912                 if _addr == addr: continue
 913                 if _hist == ['*']: continue
 914                 _tx_hist = map(lambda x:x[0], _hist)
 915                 if tx_hash in _tx_hist:
 916                     found = True
 917                     break
 918
 919             if not found:
 920                 tx = self.transactions.get(tx_hash)
 921                 # tx might not be there
 922                 if not tx: continue
 923
 924                 # already verified?
 925                 if self.verifier.get_height(tx_hash):
 926                     continue
 927                 # unconfirmed tx
 928                 print_error("new history is orphaning transaction:", tx_hash)
 929                 # check that all outputs are not mine, request histories
 930                 ext_requests = []
 931                 for _addr, _v in tx.outputs:
 932                     # assert not self.is_mine(_addr)
 933                     ext_requests.append( ('blockchain.address.get_history', [_addr]) )
 934
 935                 ext_h = self.network.synchronous_get(ext_requests)
 936                 print_error("sync:", ext_requests, ext_h)
 937                 height = None
 938                 for h in ext_h:
 939                     if h == ['*']: continue
 940                     for item in h:
 941                         if item.get('tx_hash') == tx_hash:
 942                             height = item.get('height')
 943                 if height:
 944                     print_error("found height for", tx_hash, height)
 945                     self.verifier.add(tx_hash, height)
 946                 else:
 947                     print_error("removing orphaned tx from history", tx_hash)
 948                     self.transactions.pop(tx_hash)
 949
 950         return True
 951
 952     def check_new_tx(self, tx_hash, tx):
 953         # 1 check that tx is referenced in addr_history.
 954         addresses = []
 955         for addr, hist in self.history.items():
 956             if hist == ['*']:continue
 957             for txh, height in hist:
 958                 if txh == tx_hash:
 959                     addresses.append(addr)
 960
 961         if not addresses:
 962             return False
 963
 964         # 2 check that referencing addresses are in the tx
 965         for addr in addresses:
 966             if not tx.has_address(addr):
 967                 return False
 968
 969         return True
 970
 971     def start_threads(self, network):
 972         from verifier import TxVerifier
 973         self.network = network
 974         if self.network is not None:
 975             self.verifier = TxVerifier(self.network, self.storage)
 976             self.verifier.start()
 977             self.set_verifier(self.verifier)
 978             self.synchronizer = WalletSynchronizer(self, network)
 979             self.synchronizer.start()
 980         else:
 981             self.verifier = None
 982             self.synchronizer =None
 983
 984     def stop_threads(self):
 985         if self.network:
 986             self.verifier.stop()
 987             self.synchronizer.stop()
 988
 989     def restore(self, cb):
 990         pass
 991
 992     def get_accounts(self):
 993         return self.accounts
 994
 995     def save_accounts(self):
 996         d = {}
 997         for k, v in self.accounts.items():
 998             d[k] = v.dump()
 999         self.storage.put('accounts', d, True)
1000
1001     def can_import(self):
1002         return not self.is_watching_only()
1003
1004     def is_used(self, address):
1005         h = self.history.get(address,[])
1006         c, u = self.get_addr_balance(address)
1007         return len(h), len(h) > 0 and c == -u
1008
1009     def address_is_old(self, address, age_limit=2):
1010         age = -1
1011         h = self.history.get(address, [])
1012         if h == ['*']:
1013             return True
1014         for tx_hash, tx_height in h:
1015             if tx_height == 0:
1016                 tx_age = 0
1017             else:
1018                 tx_age = self.network.get_local_height() - tx_height + 1
1019             if tx_age > age:
1020                 age = tx_age
1021         return age > age_limit
1022
1023
1024 class Imported_Wallet(Abstract_Wallet):
1025
1026     def __init__(self, storage):
1027         Abstract_Wallet.__init__(self, storage)
1028         a = self.accounts.get(IMPORTED_ACCOUNT)
1029         if not a:
1030             self.accounts[IMPORTED_ACCOUNT] = ImportedAccount({'imported':{}})
1031         self.storage.put('wallet_type', 'imported', True)
1032
1033     def is_watching_only(self):
1034         acc = self.accounts[IMPORTED_ACCOUNT]
1035         n = acc.keypairs.values()
1036         return n == [(None, None)] * len(n)
1037
1038     def has_seed(self):
1039         return False
1040
1041     def is_deterministic(self):
1042         return False
1043
1044     def check_password(self, password):
1045         self.accounts[IMPORTED_ACCOUNT].get_private_key((0,0), self, password)
1046
1047     def is_used(self, address):
1048         h = self.history.get(address,[])
1049         return len(h), False
1050
1051     def get_master_public_keys(self):
1052         return {}
1053
1054
1055 class Deterministic_Wallet(Abstract_Wallet):
1056
1057     def __init__(self, storage):
1058         Abstract_Wallet.__init__(self, storage)
1059
1060     def has_seed(self):
1061         return self.seed != ''
1062
1063     def is_deterministic(self):
1064         return True
1065
1066     def is_watching_only(self):
1067         return not self.has_seed()
1068
1069     def add_seed(self, seed, password):
1070         if self.seed:
1071             raise Exception("a seed exists")
1072
1073         self.seed_version, self.seed = self.prepare_seed(seed)
1074         if password:
1075             self.seed = pw_encode( self.seed, password)
1076             self.use_encryption = True
1077         else:
1078             self.use_encryption = False
1079
1080         self.storage.put('seed', self.seed, True)
1081         self.storage.put('seed_version', self.seed_version, True)
1082         self.storage.put('use_encryption', self.use_encryption,True)
1083         self.create_master_keys(password)
1084
1085     def get_seed(self, password):
1086         return pw_decode(self.seed, password)
1087
1088     def get_mnemonic(self, password):
1089         return self.get_seed(password)
1090
1091     def change_gap_limit(self, value):
1092         if value >= self.gap_limit:
1093             self.gap_limit = value
1094             self.storage.put('gap_limit', self.gap_limit, True)
1095             #self.interface.poke('synchronizer')
1096             return True
1097
1098         elif value >= self.min_acceptable_gap():
1099             for key, account in self.accounts.items():
1100                 addresses = account[0]
1101                 k = self.num_unused_trailing_addresses(addresses)
1102                 n = len(addresses) - k + value
1103                 addresses = addresses[0:n]
1104                 self.accounts[key][0] = addresses
1105
1106             self.gap_limit = value
1107             self.storage.put('gap_limit', self.gap_limit, True)
1108             self.save_accounts()
1109             return True
1110         else:
1111             return False
1112
1113     def num_unused_trailing_addresses(self, addresses):
1114         k = 0
1115         for a in addresses[::-1]:
1116             if self.history.get(a):break
1117             k = k + 1
1118         return k
1119
1120     def min_acceptable_gap(self):
1121         # fixme: this assumes wallet is synchronized
1122         n = 0
1123         nmax = 0
1124
1125         for account in self.accounts.values():
1126             addresses = account.get_addresses(0)
1127             k = self.num_unused_trailing_addresses(addresses)
1128             for a in addresses[0:-k]:
1129                 if self.history.get(a):
1130                     n = 0
1131                 else:
1132                     n += 1
1133                     if n > nmax: nmax = n
1134         return nmax + 1
1135
1136     def synchronize_sequence(self, account, for_change):
1137         limit = self.gap_limit_for_change if for_change else self.gap_limit
1138         new_addresses = []
1139         while True:
1140             addresses = account.get_addresses(for_change)
1141             if len(addresses) < limit:
1142                 address = account.create_new_address(for_change)
1143                 self.history[address] = []
1144                 new_addresses.append( address )
1145                 continue
1146
1147             if map( lambda a: self.address_is_old(a), addresses[-limit:] ) == limit*[False]:
1148                 break
1149             else:
1150                 address = account.create_new_address(for_change)
1151                 self.history[address] = []
1152                 new_addresses.append( address )
1153
1154         return new_addresses
1155
1156     def check_pending_accounts(self):
1157         for account_id, addr in self.next_addresses.items():
1158             if self.address_is_old(addr):
1159                 print_error( "creating account", account_id )
1160                 xpub = self.master_public_keys[account_id]
1161                 account = BIP32_Account({'xpub':xpub})
1162                 self.add_account(account_id, account)
1163                 self.next_addresses.pop(account_id)
1164
1165     def synchronize_account(self, account):
1166         new = []
1167         new += self.synchronize_sequence(account, 0)
1168         new += self.synchronize_sequence(account, 1)
1169         return new
1170
1171     def synchronize(self):
1172         self.check_pending_accounts()
1173         new = []
1174         for account in self.accounts.values():
1175             if type(account) in [ImportedAccount, PendingAccount]:
1176                 continue
1177             new += self.synchronize_account(account)
1178         if new:
1179             self.save_accounts()
1180             self.storage.put('addr_history', self.history, True)
1181         return new
1182
1183     def restore(self, callback):
1184         from i18n import _
1185         def wait_for_wallet():
1186             self.set_up_to_date(False)
1187             while not self.is_up_to_date():
1188                 msg = "%s\n%s %d\n%s %.1f"%(
1189                     _("Please wait..."),
1190                     _("Addresses generated:"),
1191                     len(self.addresses(True)),
1192                     _("Kilobytes received:"),
1193                     self.network.interface.bytes_received/1024.)
1194
1195                 apply(callback, (msg,))
1196                 time.sleep(0.1)
1197
1198         def wait_for_network():
1199             while not self.network.is_connected():
1200                 msg = "%s \n" % (_("Connecting..."))
1201                 apply(callback, (msg,))
1202                 time.sleep(0.1)
1203
1204         # wait until we are connected, because the user might have selected another server
1205         if self.network:
1206             wait_for_network()
1207             wait_for_wallet()
1208         else:
1209             self.synchronize()
1210         self.fill_addressbook()
1211
1212     def create_account(self, name, password):
1213         i = self.num_accounts()
1214         account_id = self.account_id(i)
1215         account = self.make_account(account_id, password)
1216         self.add_account(account_id, account)
1217         if name:
1218             self.set_label(account_id, name)
1219
1220         # add address of the next account
1221         _, _ = self.next_account_address(password)
1222
1223
1224     def add_account(self, account_id, account):
1225         self.accounts[account_id] = account
1226         self.save_accounts()
1227
1228     def account_is_pending(self, k):
1229         return type(self.accounts.get(k)) == PendingAccount
1230
1231     def delete_pending_account(self, k):
1232         assert self.account_is_pending(k)
1233         self.accounts.pop(k)
1234         self.save_accounts()
1235
1236     def create_pending_account(self, name, password):
1237         account_id, addr = self.next_account_address(password)
1238         self.set_label(account_id, name)
1239         self.accounts[account_id] = PendingAccount({'pending':addr})
1240         self.save_accounts()
1241
1242
1243 class NewWallet(Deterministic_Wallet):
1244
1245     def __init__(self, storage):
1246         Deterministic_Wallet.__init__(self, storage)
1247
1248     def can_create_accounts(self):
1249         return not self.is_watching_only()
1250
1251     def get_master_public_key(self):
1252         return self.master_public_keys["m/"]
1253
1254     def get_master_public_keys(self):
1255         out = {}
1256         for k, account in self.accounts.items():
1257             name = self.get_account_name(k)
1258             mpk_text = '\n\n'.join( account.get_master_pubkeys() )
1259             out[name] = mpk_text
1260         return out
1261
1262     def get_master_private_key(self, account, password):
1263         k = self.master_private_keys.get(account)
1264         if not k: return
1265         xpriv = pw_decode( k, password)
1266         return xpriv
1267
1268     def check_password(self, password):
1269         xpriv = self.get_master_private_key( "m/", password )
1270         xpub = self.master_public_keys["m/"]
1271         assert deserialize_xkey(xpriv)[3] == deserialize_xkey(xpub)[3]
1272
1273     def create_watching_only_wallet(self, xpub):
1274         self.storage.put('seed_version', self.seed_version, True)
1275         self.add_master_public_key("m/", xpub)
1276         account = BIP32_Account({'xpub':xpub})
1277         self.add_account("m/", account)
1278
1279     def create_accounts(self, password):
1280         # First check the password is valid (this raises if it isn't).
1281         self.check_password(password)
1282         self.create_account('Main account', password)
1283
1284     def add_master_public_key(self, name, mpk):
1285         self.master_public_keys[name] = mpk
1286         self.storage.put('master_public_keys', self.master_public_keys, True)
1287
1288     def add_master_private_key(self, name, xpriv, password):
1289         self.master_private_keys[name] = pw_encode(xpriv, password)
1290         self.storage.put('master_private_keys', self.master_private_keys, True)
1291
1292     def add_master_keys(self, root, account_id, password):
1293         x = self.master_private_keys.get(root)
1294         if x:
1295             master_xpriv = pw_decode(x, password )
1296             xpriv, xpub = bip32_private_derivation(master_xpriv, root, account_id)
1297             self.add_master_public_key(account_id, xpub)
1298             self.add_master_private_key(account_id, xpriv, password)
1299         else:
1300             master_xpub = self.master_public_keys[root]
1301             xpub = bip32_public_derivation(master_xpub, root, account_id)
1302             self.add_master_public_key(account_id, xpub)
1303         return xpub
1304
1305     def create_master_keys(self, password):
1306         xpriv, xpub = bip32_root(mnemonic_to_seed(self.get_seed(password),'').encode('hex'))
1307         self.add_master_public_key("m/", xpub)
1308         self.add_master_private_key("m/", xpriv, password)
1309
1310     def find_root_by_master_key(self, xpub):
1311         for key, xpub2 in self.master_public_keys.items():
1312             if key == "m/":continue
1313             if xpub == xpub2:
1314                 return key
1315
1316     def num_accounts(self):
1317         keys = []
1318         for k, v in self.accounts.items():
1319             if type(v) != BIP32_Account:
1320                 continue
1321             keys.append(k)
1322
1323         i = 0
1324         while True:
1325             account_id = self.account_id(i)
1326             if account_id not in keys: break
1327             i += 1
1328         return i
1329
1330     def next_account_address(self, password):
1331         i = self.num_accounts()
1332         account_id = self.account_id(i)
1333
1334         addr = self.next_addresses.get(account_id)
1335         if not addr:
1336             account = self.make_account(account_id, password)
1337             addr = account.first_address()
1338             self.next_addresses[account_id] = addr
1339             self.storage.put('next_addresses', self.next_addresses)
1340
1341         return account_id, addr
1342
1343     def account_id(self, i):
1344         return "m/%d'"%i
1345
1346     def make_account(self, account_id, password):
1347         """Creates and saves the master keys, but does not save the account"""
1348         xpub = self.add_master_keys("m/", account_id, password)
1349         account = BIP32_Account({'xpub':xpub})
1350         return account
1351
1352     def make_seed(self):
1353         import mnemonic, ecdsa
1354         entropy = ecdsa.util.randrange( pow(2,160) )
1355         nonce = 0
1356         while True:
1357             ss = "%040x"%(entropy+nonce)
1358             s = hashlib.sha256(ss.decode('hex')).digest().encode('hex')
1359             # we keep only 13 words, that's approximately 139 bits of entropy
1360             words = mnemonic.mn_encode(s)[0:13]
1361             seed = ' '.join(words)
1362             if is_new_seed(seed):
1363                 break  # this will remove 8 bits of entropy
1364             nonce += 1
1365         return seed
1366
1367     def prepare_seed(self, seed):
1368         import unicodedata
1369         return NEW_SEED_VERSION, unicodedata.normalize('NFC', unicode(seed.strip()))
1370
1371
1372 class Wallet_2of2(NewWallet):
1373     """ This class is used for multisignature addresses"""
1374
1375     def __init__(self, storage):
1376         NewWallet.__init__(self, storage)
1377         self.storage.put('wallet_type', '2of2', True)
1378
1379     def can_create_accounts(self):
1380         return False
1381
1382     def can_import(self):
1383         return False
1384
1385     def create_account(self):
1386         xpub1 = self.master_public_keys.get("m/")
1387         xpub2 = self.master_public_keys.get("cold/")
1388         account = BIP32_Account_2of2({'xpub':xpub1, 'xpub2':xpub2})
1389         self.add_account('m/', account)
1390
1391     def get_master_public_keys(self):
1392         xpub1 = self.master_public_keys.get("m/")
1393         xpub2 = self.master_public_keys.get("cold/")
1394         return {'hot':xpub1, 'cold':xpub2}
1395
1396     def get_action(self):
1397         xpub1 = self.master_public_keys.get("m/")
1398         xpub2 = self.master_public_keys.get("cold/")
1399         if xpub1 is None:
1400             return 'create_2of2_1'
1401         if xpub2 is None:
1402             return 'create_2of2_2'
1403
1404
1405 class Wallet_2of3(Wallet_2of2):
1406     """ This class is used for multisignature addresses"""
1407
1408     def __init__(self, storage):
1409         Wallet_2of2.__init__(self, storage)
1410         self.storage.put('wallet_type', '2of3', True)
1411
1412     def create_account(self):
1413         xpub1 = self.master_public_keys.get("m/")
1414         xpub2 = self.master_public_keys.get("cold/")
1415         xpub3 = self.master_public_keys.get("remote/")
1416         account = BIP32_Account_2of3({'xpub':xpub1, 'xpub2':xpub2, 'xpub3':xpub3})
1417         self.add_account('m/', account)
1418
1419     def get_master_public_keys(self):
1420         xpub1 = self.master_public_keys.get("m/")
1421         xpub2 = self.master_public_keys.get("cold/")
1422         xpub3 = self.master_public_keys.get("remote/")
1423         return {'hot':xpub1, 'cold':xpub2, 'remote':xpub3}
1424
1425     def get_action(self):
1426         xpub1 = self.master_public_keys.get("m/")
1427         xpub2 = self.master_public_keys.get("cold/")
1428         xpub3 = self.master_public_keys.get("remote/")
1429         # fixme: we use order of creation
1430         if xpub2 and xpub1 is None:
1431             return 'create_2fa_2'
1432         if xpub1 is None:
1433             return 'create_2of3_1'
1434         if xpub2 is None or xpub3 is None:
1435             return 'create_2of3_2'
1436
1437
1438 class OldWallet(Deterministic_Wallet):
1439
1440     def make_seed(self):
1441         import mnemonic
1442         seed = random_seed(128)
1443         return ' '.join(mnemonic.mn_encode(seed))
1444
1445     def prepare_seed(self, seed):
1446         import mnemonic
1447         # see if seed was entered as hex
1448         seed = seed.strip()
1449         try:
1450             assert seed
1451             seed.decode('hex')
1452             return OLD_SEED_VERSION, str(seed)
1453         except Exception:
1454             pass
1455
1456         words = seed.split()
1457         seed = mnemonic.mn_decode(words)
1458         if not seed:
1459             raise Exception("Invalid seed")
1460
1461         return OLD_SEED_VERSION, seed
1462
1463     def create_master_keys(self, password):
1464         seed = self.get_seed(password)
1465         mpk = OldAccount.mpk_from_seed(seed)
1466         self.storage.put('master_public_key', mpk, True)
1467
1468     def get_master_public_key(self):
1469         return self.storage.get("master_public_key")
1470
1471     def get_master_public_keys(self):
1472         return {'Main Account':self.get_master_public_key()}
1473
1474     def create_accounts(self, password):
1475         mpk = self.storage.get("master_public_key")
1476         self.create_account(mpk)
1477
1478     def create_account(self, mpk):
1479         self.accounts[0] = OldAccount({'mpk':mpk, 0:[], 1:[]})
1480         self.save_accounts()
1481
1482     def create_watching_only_wallet(self, mpk):
1483         self.seed_version = OLD_SEED_VERSION
1484         self.storage.put('seed_version', self.seed_version, True)
1485         self.storage.put('master_public_key', mpk, True)
1486         self.create_account(mpk)
1487
1488     def get_seed(self, password):
1489         seed = pw_decode(self.seed, password).encode('utf8')
1490         return seed
1491
1492     def check_password(self, password):
1493         seed = self.get_seed(password)
1494         self.accounts[0].check_seed(seed)
1495
1496     def get_mnemonic(self, password):
1497         import mnemonic
1498         s = self.get_seed(password)
1499         return ' '.join(mnemonic.mn_encode(s))
1500
1501     def check_pending_accounts(self):
1502         pass
1503
1504
1505 # former WalletFactory
1506 class Wallet(object):
1507     """The main wallet "entry point".
1508     This class is actually a factory that will return a wallet of the correct
1509     type when passed a WalletStorage instance."""
1510
1511     def __new__(self, storage):
1512         config = storage.config
1513         if config.get('bitkey', False):
1514             # if user requested support for Bitkey device,
1515             # import Bitkey driver
1516             from wallet_bitkey import WalletBitkey
1517             return WalletBitkey(config)
1518
1519         if storage.get('wallet_type') == '2of2':
1520             return Wallet_2of2(storage)
1521
1522         if storage.get('wallet_type') == '2of3':
1523             return Wallet_2of3(storage)
1524
1525         if storage.get('wallet_type') == 'imported':
1526             return Imported_Wallet(storage)
1527
1528         if not storage.file_exists:
1529             seed_version = NEW_SEED_VERSION if config.get('bip32') is True else OLD_SEED_VERSION
1530         else:
1531             seed_version = storage.get('seed_version')
1532             if not seed_version:
1533                 seed_version = OLD_SEED_VERSION if len(storage.get('master_public_key')) == 128 else NEW_SEED_VERSION
1534
1535         if seed_version == OLD_SEED_VERSION:
1536             return OldWallet(storage)
1537         elif seed_version == NEW_SEED_VERSION:
1538             return NewWallet(storage)
1539         else:
1540             msg = "This wallet seed is not supported."
1541             if seed_version in [5]:
1542                 msg += "\nTo open this wallet, try 'git checkout seed_v%d'"%seed_version
1543             print msg
1544             sys.exit(1)
1545
1546     @classmethod
1547     def is_seed(self, seed):
1548         if not seed:
1549             return False
1550         elif is_old_seed(seed):
1551             return True
1552         elif is_new_seed(seed):
1553             return True
1554         else:
1555             return False
1556
1557     @classmethod
1558     def is_mpk(self, mpk):
1559         try:
1560             int(mpk, 16)
1561             old = True
1562         except:
1563             old = False
1564
1565         if old:
1566             return len(mpk) == 128
1567         else:
1568             try:
1569                 deserialize_xkey(mpk)
1570                 return True
1571             except:
1572                 return False
1573
1574     @classmethod
1575     def is_address(self, text):
1576         if not text:
1577             return False
1578         for x in text.split():
1579             if not bitcoin.is_address(x):
1580                 return False
1581         return True
1582
1583     @classmethod
1584     def is_private_key(self, text):
1585         if not text:
1586             return False
1587         for x in text.split():
1588             if not bitcoin.is_private_key(x):
1589                 return False
1590         return True
1591
1592     @classmethod
1593     def from_seed(self, seed, storage):
1594         if is_old_seed(seed):
1595             klass = OldWallet
1596         elif is_new_seed(seed):
1597             klass = NewWallet
1598         w = klass(storage)
1599         return w
1600
1601     @classmethod
1602     def from_address(self, text, storage):
1603         w = Imported_Wallet(storage)
1604         for x in text.split():
1605             w.accounts[IMPORTED_ACCOUNT].add(x, None, None, None)
1606         w.save_accounts()
1607         return w
1608
1609     @classmethod
1610     def from_private_key(self, text, storage):
1611         w = Imported_Wallet(storage)
1612         for x in text.split():
1613             w.import_key(x, None)
1614         return w
1615
1616     @classmethod
1617     def from_mpk(self, mpk, storage):
1618         try:
1619             int(mpk, 16)
1620             old = True
1621         except:
1622             old = False
1623
1624         if old:
1625             w = OldWallet(storage)
1626             w.seed = ''
1627             w.create_watching_only_wallet(mpk)
1628         else:
1629             w = NewWallet(storage)
1630             w.create_watching_only_wallet(mpk)
1631
1632         return w