Add GreenAddress instant verify plugin

plugins/greenaddress_instant.py

@@ -0,0 +1,131 @@
+#!/usr/bin/env python
+#
+# Electrum - lightweight Bitcoin client
+# Copyright (C) 2014 Thomas Voegtlin
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+import urllib
+import httplib
+import json
+import sys
+
+from PyQt4.QtGui import QMessageBox, QApplication, QPushButton
+
+from electrum.account import BIP32_Account
+from electrum import bitcoin, util
+from electrum import transaction
+from electrum.plugins import BasePlugin, hook
+from electrum.i18n import _
+from electrum.bitcoin import regenerate_key
+
+
+description = _("Allows validating if your transactions have instant confirmations by GreenAddress")
+
+
+class Plugin(BasePlugin):
+
+    button_label = _("Verify GA instant")
+
+    def fullname(self):
+        return 'GreenAddress instant'
+
+    def description(self):
+        return description
+
+    @hook
+    def transaction_dialog(self, d):
+        self.wallet = d.wallet
+        self.verify_button = b = QPushButton(self.button_label)
+        b.clicked.connect(lambda: self.do_verify(d.tx))
+        d.buttons.insertWidget(2, b)
+        self.transaction_dialog_update(d)
+
+    def get_my_addr(self, tx):
+        """Returns the address for given tx which can be used to request
+        instant confirmation verification from GreenAddress"""
+
+        for addr, _ in tx.get_outputs():
+            if self.wallet.is_mine(addr):
+                return addr
+        return None
+
+    @hook
+    def transaction_dialog_update(self, d):
+        if d.tx.is_complete() and self.get_my_addr(d.tx):
+            self.verify_button.show()
+        else:
+            self.verify_button.hide()
+
+    def password_dialog(self):
+        d = QDialog(self)
+        d.setModal(1)
+        d.setWindowTitle(_("Enter Password"))
+
+        pw = QLineEdit()
+        pw.setEchoMode(2)
+
+        vbox = QVBoxLayout()
+        msg = _('GreenAddress requires your signature to verify that transaction is instant.\n'
+                'Please enter your password to sign a verification request.')
+        vbox.addWidget(QLabel(msg))
+
+        grid = QGridLayout()
+        grid.setSpacing(8)
+        grid.addWidget(QLabel(_('Password')), 1, 0)
+        grid.addWidget(pw, 1, 1)
+        vbox.addLayout(grid)
+
+        vbox.addLayout(ok_cancel_buttons(d))
+        d.setLayout(vbox)
+
+        run_hook('password_dialog', pw, grid, 1)
+        if not d.exec_(): return
+        return unicode(pw.text())
+
+    def do_verify(self, tx):
+        # 1. get the password and sign the verification request
+        password = None
+        if self.wallet.use_encryption:
+            password = self.password_dialog()
+            if not password:
+                return
+        try:
+            self.verify_button.setText(_('Verifying...'))
+            QApplication.processEvents()  # update the button label
+
+            addr = self.get_my_addr(tx)
+            message = "Please verify if %s is GreenAddress instant confirmed" % tx.hash()
+            sig = self.wallet.sign_message(addr, message, password)
+
+            # 2. send the request
+            connection = httplib.HTTPSConnection('greenaddress.it')
+            connection.request("GET", ("/verify/?signature=%s&txhash=%s" % (urllib.quote(sig), tx.hash())),
+                None, {'User-Agent': 'Electrum'})
+            response = connection.getresponse()
+            response = json.loads(response.read())
+
+            # 3. display the result
+            if response.get('verified'):
+                QMessageBox.information(None, _('Verification successful!'),
+                    _('%s is covered by GreenAddress instant confirmation') % (tx.hash()), _('OK'))
+            else:
+                QMessageBox.critical(None, _('Verification failed!'),
+                    _('%s is not covered by GreenAddress instant confirmation') % (tx.hash()), _('OK'))
+        except BaseException as e:
+            import traceback
+            traceback.print_exc(file=sys.stdout)
+            QMessageBox.information(None, _('Error'), str(e), _('OK'))
+        finally:
+            self.verify_button.setText(self.button_label)