plugins/qrscanner.py

   1 from electrum.util import print_error
   2 from urlparse import urlparse, parse_qs
   3 from PyQt4.QtGui import QPushButton, QMessageBox, QDialog, QVBoxLayout, QHBoxLayout, QGridLayout, QLabel, QLineEdit, QComboBox
   4 from PyQt4.QtCore import Qt
   5
   6 from electrum.i18n import _
   7 import re
   8 import os
   9 from electrum import Transaction
  10 from electrum.bitcoin import MIN_RELAY_TX_FEE, is_valid
  11 from electrum_gui.qt.qrcodewidget import QRCodeWidget
  12 from electrum import bmp
  13 from electrum_gui.qt import HelpButton, EnterButton
  14 import json
  15
  16 try:
  17     import zbar
  18 except ImportError:
  19     zbar = None
  20
  21 from electrum import BasePlugin
  22 class Plugin(BasePlugin):
  23
  24     def fullname(self): return 'QR scans'
  25
  26     def description(self): return "QR Scans.\nInstall the zbar package to enable this plugin.\nOn linux, type: 'apt-get install python-zbar'"
  27
  28     def __init__(self, gui, name):
  29         BasePlugin.__init__(self, gui, name)
  30         self._is_available = self._init()
  31
  32     def _init(self):
  33         if not zbar:
  34             return False
  35         try:
  36             proc = zbar.Processor()
  37             proc.init(video_device=self.video_device())
  38         except zbar.SystemError:
  39             # Cannot open video device
  40             pass
  41             #return False
  42
  43         return True
  44
  45     def init(self):
  46         self.win = self.gui.main_window
  47         self.win.raw_transaction_menu.addAction(_("&From QR code"), self.read_raw_qr)
  48         b = QPushButton(_("Scan QR code"))
  49         b.clicked.connect(self.fill_from_qr)
  50         self.win.send_grid.addWidget(b, 1, 5)
  51         self.win.send_grid.setColumnStretch(5, 0)
  52         self.win.send_grid.setColumnStretch(6, 1)
  53
  54     def init_transaction_dialog(self, dialog, buttons):
  55         b = QPushButton(_("Show QR code"))
  56         b.clicked.connect(lambda: self.show_raw_qr(dialog.tx))
  57         buttons.insertWidget(1,b)
  58
  59     def is_available(self):
  60         return self._is_available
  61
  62     def scan_qr(self):
  63         proc = zbar.Processor()
  64         try:
  65             proc.init(video_device=self.video_device())
  66         except zbar.SystemError, e:
  67             QMessageBox.warning(self.win, _('Error'), _(e), _('OK'))
  68             return
  69
  70         proc.visible = True
  71
  72         while True:
  73             try:
  74                 proc.process_one()
  75             except Exception:
  76                 # User closed the preview window
  77                 return {}
  78
  79             for r in proc.results:
  80                 if str(r.type) != 'QRCODE':
  81                     continue
  82                 return r.data
  83
  84     def show_raw_qr(self, tx):
  85         try:
  86             json_text = json.dumps(tx.as_dict()).replace(' ', '')
  87             self.show_tx_qrcode(json_text, 'Unsigned Transaction')
  88         except Exception as e:
  89             self.win.show_message(str(e))
  90
  91     def show_tx_qrcode(self, data, title):
  92         if not data: return
  93         d = QDialog(self.win)
  94         d.setModal(1)
  95         d.setWindowTitle(title)
  96         d.setMinimumSize(250, 525)
  97         vbox = QVBoxLayout()
  98         qrw = QRCodeWidget(data)
  99         vbox.addWidget(qrw, 0)
 100         hbox = QHBoxLayout()
 101         hbox.addStretch(1)
 102
 103         def print_qr(self):
 104             filename = "qrcode.bmp"
 105             electrum_gui.bmp.save_qrcode(qrw.qr, filename)
 106             QMessageBox.information(None, _('Message'), _("QR code saved to file") + " " + filename, _('OK'))
 107
 108         b = QPushButton(_("Save"))
 109         hbox.addWidget(b)
 110         b.clicked.connect(print_qr)
 111
 112         b = QPushButton(_("Close"))
 113         hbox.addWidget(b)
 114         b.clicked.connect(d.accept)
 115         b.setDefault(True)
 116
 117         vbox.addLayout(hbox, 1)
 118         d.setLayout(vbox)
 119         d.exec_()
 120
 121     def read_raw_qr(self):
 122         qrcode = self.scan_qr()
 123         if not qrcode:
 124             return
 125         tx = self.win.tx_from_text(qrcode)
 126         if not tx:
 127             return
 128         self.win.show_transaction(tx)
 129
 130
 131     def fill_from_qr(self):
 132         qrcode = parse_uri(self.scan_qr())
 133         if not qrcode:
 134             return
 135
 136         if 'address' in qrcode:
 137             self.win.payto_e.setText(qrcode['address'])
 138         if 'amount' in qrcode:
 139             self.win.amount_e.setText(str(qrcode['amount']))
 140         if 'label' in qrcode:
 141             self.win.message_e.setText(qrcode['label'])
 142         if 'message' in qrcode:
 143             self.win.message_e.setText("%s (%s)" % (self.win.message_e.text(), qrcode['message']))
 144
 145     def video_device(self):
 146         device = self.config.get("video_device", "default")
 147         if device == 'default':
 148             device = ''
 149         return device
 150
 151     def requires_settings(self):
 152         return True
 153
 154     def settings_widget(self, window):
 155         return EnterButton(_('Settings'), self.settings_dialog)
 156
 157     def _find_system_cameras(self):
 158         device_root = "/sys/class/video4linux"
 159         devices = {} # Name -> device
 160         if os.path.exists(device_root):
 161             for device in os.listdir(device_root):
 162                 name = open(os.path.join(device_root, device, 'name')).read()
 163                 devices[name] = os.path.join("/dev",device)
 164         return devices
 165
 166     def settings_dialog(self):
 167         system_cameras = self._find_system_cameras()
 168
 169         d = QDialog()
 170         layout = QGridLayout(d)
 171         layout.addWidget(QLabel("Choose a video device:"),0,0)
 172
 173         # Create a combo box with the available video devices:
 174         combo = QComboBox()
 175
 176         # on change trigger for video device selection, makes the
 177         # manual device selection only appear when needed:
 178         def on_change(x):
 179             combo_text = str(combo.itemText(x))
 180             combo_data = combo.itemData(x)
 181             if combo_text == "Manually specify a device":
 182                 custom_device_label.setVisible(True)
 183                 self.video_device_edit.setVisible(True)
 184                 if self.config.get("video_device") == "default":
 185                     self.video_device_edit.setText("")
 186                 else:
 187                     self.video_device_edit.setText(self.config.get("video_device"))
 188             else:
 189                 custom_device_label.setVisible(False)
 190                 self.video_device_edit.setVisible(False)
 191                 self.video_device_edit.setText(combo_data.toString())
 192
 193         # on save trigger for the video device selection window,
 194         # stores the chosen video device on close.
 195         def on_save():
 196             device = str(self.video_device_edit.text())
 197             self.config.set_key("video_device", device)
 198             d.accept()
 199
 200         custom_device_label = QLabel("Video device: ")
 201         custom_device_label.setVisible(False)
 202         layout.addWidget(custom_device_label,1,0)
 203         self.video_device_edit = QLineEdit()
 204         self.video_device_edit.setVisible(False)
 205         layout.addWidget(self.video_device_edit, 1,1,2,2)
 206         combo.currentIndexChanged.connect(on_change)
 207
 208         combo.addItem("Default","default")
 209         for camera, device in system_cameras.items():
 210             combo.addItem(camera, device)
 211         combo.addItem("Manually specify a device",self.config.get("video_device"))
 212
 213         # Populate the previously chosen device:
 214         index = combo.findData(self.config.get("video_device"))
 215         combo.setCurrentIndex(index)
 216
 217         layout.addWidget(combo,0,1)
 218
 219         self.accept = QPushButton(_("Done"))
 220         self.accept.clicked.connect(on_save)
 221         layout.addWidget(self.accept,4,2)
 222
 223         if d.exec_():
 224           return True
 225         else:
 226           return False
 227
 228
 229
 230 def parse_uri(uri):
 231     if not uri:
 232         return {}
 233
 234     if ':' not in uri:
 235         # It's just an address (not BIP21)
 236         return {'address': uri}
 237
 238     if '//' not in uri:
 239         # Workaround for urlparse, it don't handle bitcoin: URI properly
 240         uri = uri.replace(':', '://')
 241
 242     uri = urlparse(uri)
 243     result = {'address': uri.netloc}
 244
 245     if uri.query.startswith('?'):
 246         params = parse_qs(uri.query[1:])
 247     else:
 248         params = parse_qs(uri.query)
 249
 250     for k,v in params.items():
 251         if k in ('amount', 'label', 'message'):
 252             result[k] = v[0]
 253
 254     return result
 255
 256
 257
 258
 259
 260 if __name__ == '__main__':
 261     # Run some tests
 262
 263     assert(parse_uri('1Marek48fwU7mugmSe186do2QpUkBnpzSN') ==
 264            {'address': '1Marek48fwU7mugmSe186do2QpUkBnpzSN'})
 265
 266     assert(parse_uri('bitcoin://1Marek48fwU7mugmSe186do2QpUkBnpzSN') ==
 267            {'address': '1Marek48fwU7mugmSe186do2QpUkBnpzSN'})
 268
 269     assert(parse_uri('bitcoin:1Marek48fwU7mugmSe186do2QpUkBnpzSN') ==
 270            {'address': '1Marek48fwU7mugmSe186do2QpUkBnpzSN'})
 271
 272     assert(parse_uri('bitcoin:1Marek48fwU7mugmSe186do2QpUkBnpzSN?amount=10') ==
 273            {'amount': '10', 'address': '1Marek48fwU7mugmSe186do2QpUkBnpzSN'})
 274
 275     assert(parse_uri('bitcoin:1Marek48fwU7mugmSe186do2QpUkBnpzSN?amount=10&label=slush&message=Small%20tip%20to%20slush') ==
 276            {'amount': '10', 'label': 'slush', 'message': 'Small tip to slush', 'address': '1Marek48fwU7mugmSe186do2QpUkBnpzSN'})
 277
 278