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