from electrum.util import print_error from urlparse import urlparse, parse_qs from PyQt4.QtGui import QPushButton, QMessageBox, QDialog, QVBoxLayout, QHBoxLayout, QGridLayout, QLabel, QLineEdit, QComboBox from PyQt4.QtCore import Qt from electrum.i18n import _ import re import os from electrum import Transaction from electrum.bitcoin import MIN_RELAY_TX_FEE, is_valid from electrum_gui.qt.qrcodewidget import QRCodeWidget from electrum import bmp from electrum_gui.qt import HelpButton, EnterButton import json try: import zbar except ImportError: zbar = None from electrum import BasePlugin class Plugin(BasePlugin): def fullname(self): return 'QR scans' def description(self): return "QR Scans.\nInstall the zbar package to enable this plugin.\nOn linux, type: 'apt-get install python-zbar'" def __init__(self, gui, name): BasePlugin.__init__(self, gui, name) self._is_available = self._init() def _init(self): if not zbar: return False try: proc = zbar.Processor() proc.init(video_device=self.video_device()) except zbar.SystemError: # Cannot open video device pass #return False return True def init(self): self.win = self.gui.main_window self.win.raw_transaction_menu.addAction(_("&From QR code"), self.read_raw_qr) b = QPushButton(_("Scan QR code")) b.clicked.connect(self.fill_from_qr) self.win.send_grid.addWidget(b, 1, 5) self.win.send_grid.setColumnStretch(5, 0) self.win.send_grid.setColumnStretch(6, 1) def init_transaction_dialog(self, dialog, buttons): b = QPushButton(_("Show QR code")) b.clicked.connect(self.show_raw_qr) buttons.insertWidget(1,b) def is_available(self): return self._is_available def scan_qr(self): proc = zbar.Processor() try: proc.init(video_device=self.video_device()) except zbar.SystemError, e: QMessageBox.warning(self.win, _('Error'), _(e), _('OK')) return proc.visible = True while True: try: proc.process_one() except Exception: # User closed the preview window return {} for r in proc.results: if str(r.type) != 'QRCODE': continue return r.data def show_raw_qr(self): r = self.win.read_send_tab() if not r: return outputs, fee, label, coins = r try: tx = self.win.wallet.make_unsigned_transaction(outputs, fee, None, None, coins) except Exception as e: self.win.show_message(str(e)) return if tx.requires_fee(self.win.wallet.verifier) and fee < MIN_RELAY_TX_FEE: QMessageBox.warning(self.win, _('Error'), _("This transaction requires a higher fee, or it will not be propagated by the network."), _('OK')) return try: out = { "hex" : tx.hash(), "complete" : "false" } input_info = [] except Exception as e: self.win.show_message(str(e)) try: json_text = json.dumps(tx.as_dict()).replace(' ', '') self.show_tx_qrcode(json_text, 'Unsigned Transaction') except Exception as e: self.win.show_message(str(e)) def show_tx_qrcode(self, data, title): if not data: return d = QDialog(self.win) d.setModal(1) d.setWindowTitle(title) d.setMinimumSize(250, 525) vbox = QVBoxLayout() qrw = QRCodeWidget(data) vbox.addWidget(qrw, 0) hbox = QHBoxLayout() hbox.addStretch(1) def print_qr(self): filename = "qrcode.bmp" electrum_gui.bmp.save_qrcode(qrw.qr, filename) QMessageBox.information(None, _('Message'), _("QR code saved to file") + " " + filename, _('OK')) b = QPushButton(_("Save")) hbox.addWidget(b) b.clicked.connect(print_qr) b = QPushButton(_("Close")) hbox.addWidget(b) b.clicked.connect(d.accept) b.setDefault(True) vbox.addLayout(hbox, 1) d.setLayout(vbox) d.exec_() def read_raw_qr(self): qrcode = self.scan_qr() if not qrcode: return tx = self.win.tx_from_text(qrcode) if not tx: return self.win.show_transaction(tx) def fill_from_qr(self): qrcode = parse_uri(self.scan_qr()) if not qrcode: return if 'address' in qrcode: self.win.payto_e.setText(qrcode['address']) if 'amount' in qrcode: self.win.amount_e.setText(str(qrcode['amount'])) if 'label' in qrcode: self.win.message_e.setText(qrcode['label']) if 'message' in qrcode: self.win.message_e.setText("%s (%s)" % (self.win.message_e.text(), qrcode['message'])) def video_device(self): device = self.config.get("video_device", "default") if device == 'default': device = '' return device def requires_settings(self): return True def settings_widget(self, window): return EnterButton(_('Settings'), self.settings_dialog) def _find_system_cameras(self): device_root = "/sys/class/video4linux" devices = {} # Name -> device if os.path.exists(device_root): for device in os.listdir(device_root): name = open(os.path.join(device_root, device, 'name')).read() devices[name] = os.path.join("/dev",device) return devices def settings_dialog(self): system_cameras = self._find_system_cameras() d = QDialog() layout = QGridLayout(d) layout.addWidget(QLabel("Choose a video device:"),0,0) # Create a combo box with the available video devices: combo = QComboBox() # on change trigger for video device selection, makes the # manual device selection only appear when needed: def on_change(x): combo_text = str(combo.itemText(x)) combo_data = combo.itemData(x) if combo_text == "Manually specify a device": custom_device_label.setVisible(True) self.video_device_edit.setVisible(True) if self.config.get("video_device") == "default": self.video_device_edit.setText("") else: self.video_device_edit.setText(self.config.get("video_device")) else: custom_device_label.setVisible(False) self.video_device_edit.setVisible(False) self.video_device_edit.setText(combo_data.toString()) # on save trigger for the video device selection window, # stores the chosen video device on close. def on_save(): device = str(self.video_device_edit.text()) self.config.set_key("video_device", device) d.accept() custom_device_label = QLabel("Video device: ") custom_device_label.setVisible(False) layout.addWidget(custom_device_label,1,0) self.video_device_edit = QLineEdit() self.video_device_edit.setVisible(False) layout.addWidget(self.video_device_edit, 1,1,2,2) combo.currentIndexChanged.connect(on_change) combo.addItem("Default","default") for camera, device in system_cameras.items(): combo.addItem(camera, device) combo.addItem("Manually specify a device",self.config.get("video_device")) # Populate the previously chosen device: index = combo.findData(self.config.get("video_device")) combo.setCurrentIndex(index) layout.addWidget(combo,0,1) self.accept = QPushButton(_("Done")) self.accept.clicked.connect(on_save) layout.addWidget(self.accept,4,2) if d.exec_(): return True else: return False def parse_uri(uri): if not uri: return {} if ':' not in uri: # It's just an address (not BIP21) return {'address': uri} if '//' not in uri: # Workaround for urlparse, it don't handle bitcoin: URI properly uri = uri.replace(':', '://') uri = urlparse(uri) result = {'address': uri.netloc} if uri.query.startswith('?'): params = parse_qs(uri.query[1:]) else: params = parse_qs(uri.query) for k,v in params.items(): if k in ('amount', 'label', 'message'): result[k] = v[0] return result if __name__ == '__main__': # Run some tests assert(parse_uri('1Marek48fwU7mugmSe186do2QpUkBnpzSN') == {'address': '1Marek48fwU7mugmSe186do2QpUkBnpzSN'}) assert(parse_uri('bitcoin://1Marek48fwU7mugmSe186do2QpUkBnpzSN') == {'address': '1Marek48fwU7mugmSe186do2QpUkBnpzSN'}) assert(parse_uri('bitcoin:1Marek48fwU7mugmSe186do2QpUkBnpzSN') == {'address': '1Marek48fwU7mugmSe186do2QpUkBnpzSN'}) assert(parse_uri('bitcoin:1Marek48fwU7mugmSe186do2QpUkBnpzSN?amount=10') == {'amount': '10', 'address': '1Marek48fwU7mugmSe186do2QpUkBnpzSN'}) assert(parse_uri('bitcoin:1Marek48fwU7mugmSe186do2QpUkBnpzSN?amount=10&label=slush&message=Small%20tip%20to%20slush') == {'amount': '10', 'label': 'slush', 'message': 'Small tip to slush', 'address': '1Marek48fwU7mugmSe186do2QpUkBnpzSN'})