def fiat_to_btc(self, fiat_amount):
if not fiat_amount:
return ''
rate = self.fx.exchange_rate()
if not rate:
return ''
satoshis = int(pow(10, 8) * Decimal(fiat_amount) / Decimal(rate))
return format_satoshis_plain(satoshis, self.decimal_point())
def get_max_amount(self):
inputs = self.wallet.get_spendable_coins(None)
addr = str(
self.send_screen.screen.address) or self.wallet.dummy_address()
outputs = [(TYPE_ADDRESS, addr, '!')]
tx = self.wallet.make_unsigned_transaction(inputs, outputs,
self.electrum_config)
amount = tx.output_value()
return format_satoshis_plain(amount, self.decimal_point())
def format_amount_and_units(self, x):
return format_satoshis_plain(
x, self.decimal_point()) + ' ' + self.base_unit
def sign_transaction(self, tx, password):
if tx.is_complete():
return
client = self.get_client()
self.signing = True
inputs = []
inputsPaths = []
pubKeys = []
chipInputs = []
redeemScripts = []
signatures = []
preparedTrustedInputs = []
changePath = ""
changeAmount = None
output = None
outputAmount = None
p2shTransaction = False
reorganize = False
pin = ""
self.get_client(
) # prompt for the PIN before displaying the dialog if necessary
# Fetch inputs of the transaction to sign
derivations = self.get_tx_derivations(tx)
for txin in tx.inputs():
if txin.get('is_coinbase'):
self.give_error(
"Coinbase not supported") # should never happen
if len(txin['pubkeys']) > 1:
p2shTransaction = True
for i, x_pubkey in enumerate(txin['x_pubkeys']):
if x_pubkey in derivations:
signingPos = i
s = derivations.get(x_pubkey)
hwAddress = "%s/%d/%d" % (self.get_derivation()[2:], s[0],
s[1])
break
else:
self.give_error("No matching x_key for sign_transaction"
) # should never happen
inputs.append([
txin['prev_tx'].raw, txin['prevout_n'],
txin.get('redeemScript'), txin['prevout_hash'], signingPos
])
inputsPaths.append(hwAddress)
pubKeys.append(txin['pubkeys'])
# Sanity check
if p2shTransaction:
for txinput in tx.inputs():
if len(txinput['pubkeys']) < 2:
self.give_error(
"P2SH / regular input mixed in same transaction not supported"
) # should never happen
txOutput = var_int(len(tx.outputs()))
for txout in tx.outputs():
output_type, addr, amount = txout
txOutput += int_to_hex(amount, 8)
script = tx.pay_script(output_type, addr)
txOutput += var_int(len(script) / 2)
txOutput += script
txOutput = txOutput.decode('hex')
# Recognize outputs - only one output and one change is authorized
if not p2shTransaction:
if len(tx.outputs()) > 2: # should never happen
self.give_error(
"Transaction with more than 2 outputs not supported")
for _type, address, amount in tx.outputs():
assert _type == TYPE_ADDRESS
info = tx.output_info.get(address)
if info is not None:
index, xpubs, m = info
changePath = self.get_derivation()[2:] + "/%d/%d" % index
changeAmount = amount
else:
output = address
if not self.canAlternateCoinVersions:
v, h = bc_address_to_hash_160(address)
if v == 48:
output = hash_160_to_bc_address(h, 0)
outputAmount = amount
self.handler.show_message(
_("Confirm Transaction on your Ledger device..."))
try:
# Get trusted inputs from the original transactions
for utxo in inputs:
if not p2shTransaction:
txtmp = bitcoinTransaction(bytearray(
utxo[0].decode('hex')))
chipInputs.append(self.get_client().getTrustedInput(
txtmp, utxo[1]))
redeemScripts.append(txtmp.outputs[utxo[1]].script)
else:
tmp = utxo[3].decode('hex')[::-1].encode('hex')
tmp += int_to_hex(utxo[1], 4)
chipInputs.append({'value': tmp.decode('hex')})
redeemScripts.append(bytearray(utxo[2].decode('hex')))
# Sign all inputs
firstTransaction = True
inputIndex = 0
rawTx = tx.serialize()
self.get_client().enableAlternate2fa(False)
while inputIndex < len(inputs):
self.get_client().startUntrustedTransaction(
firstTransaction, inputIndex, chipInputs,
redeemScripts[inputIndex])
if not p2shTransaction:
outputData = self.get_client().finalizeInput(
output, format_satoshis_plain(outputAmount),
format_satoshis_plain(tx.get_fee()), changePath,
bytearray(rawTx.decode('hex')))
reorganize = True
else:
outputData = self.get_client().finalizeInputFull(txOutput)
outputData['outputData'] = txOutput
if firstTransaction:
transactionOutput = outputData['outputData']
if outputData['confirmationNeeded']:
outputData['address'] = output
self.handler.clear_dialog()
pin = self.handler.get_auth(
outputData
) # does the authenticate dialog and returns pin
if not pin:
raise UserWarning()
if pin != 'paired':
self.handler.show_message(
_("Confirmed. Signing Transaction..."))
else:
# Sign input with the provided PIN
inputSignature = self.get_client().untrustedHashSign(
inputsPaths[inputIndex], pin)
inputSignature[0] = 0x30 # force for 1.4.9+
signatures.append(inputSignature)
inputIndex = inputIndex + 1
if pin != 'paired':
firstTransaction = False
except UserWarning:
self.handler.show_error(_('Cancelled by user'))
return
except BaseException as e:
traceback.print_exc(file=sys.stdout)
self.give_error(e, True)
finally:
self.handler.clear_dialog()
# Reformat transaction
inputIndex = 0
while inputIndex < len(inputs):
if p2shTransaction:
signaturesPack = [signatures[inputIndex]] * len(
pubKeys[inputIndex])
inputScript = get_p2sh_input_script(redeemScripts[inputIndex],
signaturesPack)
preparedTrustedInputs.append([
("\x00" * 4) + chipInputs[inputIndex]['value'], inputScript
])
else:
inputScript = get_regular_input_script(
signatures[inputIndex],
pubKeys[inputIndex][0].decode('hex'))
preparedTrustedInputs.append(
[chipInputs[inputIndex]['value'], inputScript])
inputIndex = inputIndex + 1
updatedTransaction = format_transaction(transactionOutput,
preparedTrustedInputs)
updatedTransaction = hexlify(updatedTransaction)
if reorganize:
tx.update(updatedTransaction)
else:
tx.update_signatures(updatedTransaction)
self.signing = False
def setAmount(self, amount):
if amount is None:
self.setText(" ") # Space forces repaint in case units changed
else:
self.setText(format_satoshis_plain(amount, self.decimal_point()))