electrum/client/gui.py

#!/usr/bin/env python
#
# Electrum - lightweight Bitcoin client
# Copyright (C) 2011 thomasv@gitorious
#
# 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 datetime
import thread, time, ast, sys, re
import socket, traceback
import pygtk
pygtk.require('2.0')
import gtk, gobject
import pyqrnative
from decimal import Decimal

gtk.gdk.threads_init()
APP_NAME = "Electrum"

from wallet import format_satoshis

def numbify(entry, is_int = False):
    text = entry.get_text().strip()
    chars = '0123456789'
    if not is_int: chars +='.'
    s = ''.join([i for i in text if i in chars])
    if not is_int:
        if '.' in s:
            p = s.find('.')
            s = s.replace('.','')
            s = s[:p] + '.' + s[p:p+8]
        try:
            amount = int( Decimal(s) * 100000000 )
        except:
            amount = None
    else:
        try:
            amount = int( s )
        except:
            amount = None
    entry.set_text(s)
    return amount




def show_seed_dialog(wallet, password, parent):
    import mnemonic
    try:
        seed = wallet.pw_decode( wallet.seed, password)
    except:
        show_message("Incorrect password")
        return
    dialog = gtk.MessageDialog(
        parent = parent,
        flags = gtk.DIALOG_MODAL, 
        buttons = gtk.BUTTONS_OK, 
        message_format = "Your wallet generation seed is:\n\n" + seed \
            + "\n\nPlease keep it in a safe place; if you lose it, you will not be able to restore your wallet.\n\n" \
            + "Equivalently, your wallet seed can be stored and recovered with the following mnemonic code:\n\n\"" + ' '.join(mnemonic.mn_encode(seed)) + "\"" )
    dialog.set_title("Seed")
    dialog.show()
    dialog.run()
    dialog.destroy()

def init_wallet(wallet):

    try:
        found = wallet.read()
    except BaseException, e:
        show_message(e.message)
        exit(1)

    if not found: 
        # ask if the user wants to create a new wallet, or recover from a seed. 
        # if he wants to recover, and nothing is found, do not create wallet
        dialog = gtk.Dialog("electrum", parent=None, 
                            flags=gtk.DIALOG_MODAL|gtk.DIALOG_NO_SEPARATOR, 
                            buttons= ("create", 0, "restore",1, "cancel",2)  )

        label = gtk.Label("Wallet file not found.\nDo you want to create a new wallet,\n or to restore an existing one?"  )
        label.show()
        dialog.vbox.pack_start(label)
        dialog.show()
        r = dialog.run()
        dialog.destroy()
        if r==2:
            sys.exit(1)
        
        is_recovery = (r==1)

        if not is_recovery:

            wallet.new_seed(None)

            # ask for the server.
            wallet.interface.get_servers()
            run_network_dialog( wallet, parent=None )

            # generate first key
            wallet.synchronize()

            # run a dialog indicating the seed, ask the user to remember it
            show_seed_dialog(wallet, None, None)
            
            #ask for password
            change_password_dialog(wallet, None, None)

        else:
            # ask for the server.
            wallet.interface.get_servers()
            run_network_dialog( wallet, parent=None )

            # ask for seed and gap.
            run_recovery_dialog( wallet )

            dialog = gtk.MessageDialog(
                parent = None,
                flags = gtk.DIALOG_MODAL, 
                buttons = gtk.BUTTONS_CANCEL, 
                message_format = "Please wait..."  )
            dialog.show()

            def recover_thread( wallet, dialog ):
                wallet.init_mpk( wallet.seed ) # not encrypted at this point
                wallet.synchronize()

                if wallet.is_found():
                    # history and addressbook
                    wallet.update_tx_history()
                    wallet.fill_addressbook()
                    print "recovery successful"
                    wallet.save()

                gobject.idle_add( dialog.destroy )

            thread.start_new_thread( recover_thread, ( wallet, dialog ) )
            r = dialog.run()
            dialog.destroy()
            if r==gtk.RESPONSE_CANCEL: sys.exit(1)
            if not wallet.is_found:
                show_message("No transactions found for this seed")


def run_recovery_dialog(wallet):
    message = "Please enter your wallet seed or the corresponding mnemonic list of words, and the gap limit of your wallet."
    dialog = gtk.MessageDialog(
        parent = None,
        flags = gtk.DIALOG_MODAL, 
        buttons = gtk.BUTTONS_OK_CANCEL,
        message_format = message)

    vbox = dialog.vbox
    dialog.set_default_response(gtk.RESPONSE_OK)

    # ask seed, server and gap in the same dialog
    seed_box = gtk.HBox()
    seed_label = gtk.Label('Seed or mnemonic:')
    seed_label.set_size_request(150,-1)
    seed_box.pack_start(seed_label, False, False, 10)
    seed_label.show()
    seed_entry = gtk.Entry()
    seed_entry.show()
    seed_entry.set_size_request(450,-1)
    seed_box.pack_start(seed_entry, False, False, 10)
    add_help_button(seed_box, '.')
    seed_box.show()
    vbox.pack_start(seed_box, False, False, 5)    

    gap = gtk.HBox()
    gap_label = gtk.Label('Gap limit:')
    gap_label.set_size_request(150,10)
    gap_label.show()
    gap.pack_start(gap_label,False, False, 10)
    gap_entry = gtk.Entry()
    gap_entry.set_text("%d"%wallet.gap_limit)
    gap_entry.connect('changed', numbify, True)
    gap_entry.show()
    gap.pack_start(gap_entry,False,False, 10)
    add_help_button(gap, 'The maximum gap that is allowed between unused addresses in your wallet. During wallet recovery, this parameter is used to decide when to stop the recovery process. If you increase this value, you will need to remember it in order to be able to recover your wallet from seed.')
    gap.show()
    vbox.pack_start(gap, False,False, 5)

    dialog.show()
    r = dialog.run()
    gap = gap_entry.get_text()        
    seed = seed_entry.get_text()
    dialog.destroy()

    if r==gtk.RESPONSE_CANCEL:
        sys.exit(1)
    try:
        gap = int(gap)
    except:
        show_message("error")
        sys.exit(1)

    try:
        seed.decode('hex')
    except:
        import mnemonic
        print "not hex, trying decode"
        seed = mnemonic.mn_decode( seed.split(' ') )
    if not seed:
        show_message("no seed")
        sys.exit(1)
        
    wallet.seed = seed
    wallet.gap_limit = gap
    wallet.save()



def run_settings_dialog(wallet, parent):

    message = "These are the settings of your wallet. For more explanations, click on the question mark buttons next to each input field."
        
    dialog = gtk.MessageDialog(
        parent = parent,
        flags = gtk.DIALOG_MODAL, 
        buttons = gtk.BUTTONS_OK_CANCEL,
        message_format = message)

    image = gtk.Image()
    image.set_from_stock(gtk.STOCK_PREFERENCES, gtk.ICON_SIZE_DIALOG)
    image.show()
    dialog.set_image(image)
    dialog.set_title("Settings")

    vbox = dialog.vbox
    dialog.set_default_response(gtk.RESPONSE_OK)

    fee = gtk.HBox()
    fee_entry = gtk.Entry()
    fee_label = gtk.Label('Transaction fee:')
    fee_label.set_size_request(150,10)
    fee_label.show()
    fee.pack_start(fee_label,False, False, 10)
    fee_entry.set_text( str( Decimal(wallet.fee) /100000000 ) )
    fee_entry.connect('changed', numbify, False)
    fee_entry.show()
    fee.pack_start(fee_entry,False,False, 10)
    add_help_button(fee, 'Fee per transaction input. Transactions involving multiple inputs tend to have a higher fee. Recommended value:0.0005')
    fee.show()
    vbox.pack_start(fee, False,False, 5)
            
    dialog.show()
    r = dialog.run()
    fee = fee_entry.get_text()
        
    dialog.destroy()
    if r==gtk.RESPONSE_CANCEL:
        return

    try:
        fee = int( 100000000 * Decimal(fee) )
    except:
        show_message("error")
        return

    wallet.fee = fee
    wallet.save()



def run_network_dialog( wallet, parent ):
    image = gtk.Image()
    image.set_from_stock(gtk.STOCK_NETWORK, gtk.ICON_SIZE_DIALOG)

    if parent:
        if wallet.interface.is_connected:
            status = "Connected to %s.\n%d blocks\nresponse time: %f"%(wallet.interface.host, wallet.interface.blocks, wallet.interface.rtime)
        else:
            status = "Not connected"
        host = wallet.interface.host
        port = wallet.interface.port
    else:
        import random
        status = "Please choose a server."
        host = random.choice( wallet.interface.servers )
        port = 50000

    dialog = gtk.MessageDialog( parent, gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT,
                                    gtk.MESSAGE_QUESTION, gtk.BUTTONS_OK_CANCEL, status)
    dialog.set_title("Server")
    dialog.set_image(image)
    image.show()
    
    vbox = dialog.vbox
    host_box = gtk.HBox()
    host_label = gtk.Label('Connect to:')
    host_label.set_size_request(100,-1)
    host_label.show()
    host_box.pack_start(host_label, False, False, 10)
    host_entry = gtk.Entry()
    host_entry.set_size_request(200,-1)
    host_entry.set_text(host+":%d"%port)
    host_entry.show()
    host_box.pack_start(host_entry, False, False, 10)
    add_help_button(host_box, 'The name and port number of your Electrum server, separated by a colon. Example: "ecdsa.org:50000". If no port number is provided, port 50000 will be tried. Some servers allow you to connect through http (port 80) or https (port 443)')
    host_box.show()
        
    server_list = gtk.ListStore(str)
    for item in wallet.interface.servers:
        server_list.append([item])
    
    treeview = gtk.TreeView(model=server_list)
    treeview.show()

    tvcolumn = gtk.TreeViewColumn('Active servers')
    treeview.append_column(tvcolumn)
    cell = gtk.CellRendererText()
    tvcolumn.pack_start(cell, False)
    tvcolumn.add_attribute(cell, 'text', 0)

    scroll = gtk.ScrolledWindow()
    scroll.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
    scroll.add(treeview)
    scroll.show()

    vbox.pack_start(host_box, False,False, 5)
    vbox.pack_start(scroll)

    def my_treeview_cb(treeview):
        path, view_column = treeview.get_cursor()
        host = server_list.get_value( server_list.get_iter(path), 0)
        host_entry.set_text(host+":50000")
    treeview.connect('cursor-changed', my_treeview_cb)

    dialog.show()
    r = dialog.run()
    hh = host_entry.get_text()
    dialog.destroy()

    if r==gtk.RESPONSE_CANCEL:
        if parent == None:
            sys.exit(1)
        else:
            return

    try:
        if ':' in hh:
            host, port = hh.split(':')
            port = int(port)
        else:
            host = hh
            port = 50000
    except:
        show_message("error")
        if parent == None:
            sys.exit(1)
        else:
            return

    if host!= wallet.interface.host or port!=wallet.interface.port:
        wallet.interface.host = host
        wallet.interface.set_port( port )
        wallet.interface.is_connected = False
        if parent:
            wallet.save()



def show_message(message, parent=None):
    dialog = gtk.MessageDialog(
        parent = parent,
        flags = gtk.DIALOG_MODAL, 
        buttons = gtk.BUTTONS_CLOSE, 
        message_format = message )
    dialog.show()
    dialog.run()
    dialog.destroy()

def password_line(label):
    password = gtk.HBox()
    password_label = gtk.Label(label)
    password_label.set_size_request(120,10)
    password_label.show()
    password.pack_start(password_label,False, False, 10)
    password_entry = gtk.Entry()
    password_entry.set_size_request(300,-1)
    password_entry.set_visibility(False)
    password_entry.show()
    password.pack_start(password_entry,False,False, 10)
    password.show()
    return password, password_entry

def password_dialog(parent):
    dialog = gtk.MessageDialog( parent, gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT,
                                gtk.MESSAGE_QUESTION, gtk.BUTTONS_OK_CANCEL,  "Please enter your password.")
    dialog.get_image().set_visible(False)
    current_pw, current_pw_entry = password_line('Password:')
    current_pw_entry.connect("activate", lambda entry, dialog, response: dialog.response(response), dialog, gtk.RESPONSE_OK)
    dialog.vbox.pack_start(current_pw, False, True, 0)
    dialog.show()
    result = dialog.run()
    pw = current_pw_entry.get_text()
    dialog.destroy()
    if result != gtk.RESPONSE_CANCEL: return pw

def change_password_dialog(wallet, parent, icon):
    if parent:
        msg = 'Your wallet is encrypted. Use this dialog to change the password. To disable wallet encryption, enter an empty new password.' if wallet.use_encryption else 'Your wallet keys are not encrypted'
    else:
        msg = "Please choose a password to encrypt your wallet keys"

    dialog = gtk.MessageDialog( parent, gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT, gtk.MESSAGE_QUESTION, gtk.BUTTONS_OK_CANCEL, msg)
    dialog.set_title("Change password")
    image = gtk.Image()
    image.set_from_stock(gtk.STOCK_DIALOG_AUTHENTICATION, gtk.ICON_SIZE_DIALOG)
    image.show()
    dialog.set_image(image)

    if wallet.use_encryption:
        current_pw, current_pw_entry = password_line('Current password:')
        dialog.vbox.pack_start(current_pw, False, True, 0)

    password, password_entry = password_line('New password:')
    dialog.vbox.pack_start(password, False, True, 5)
    password2, password2_entry = password_line('Confirm password:')
    dialog.vbox.pack_start(password2, False, True, 5)

    dialog.show()
    result = dialog.run()
    password = current_pw_entry.get_text() if wallet.use_encryption else None
    new_password = password_entry.get_text()
    new_password2 = password2_entry.get_text()
    dialog.destroy()
    if result == gtk.RESPONSE_CANCEL: 
        return

    try:
        seed = wallet.pw_decode( wallet.seed, password)
    except:
        show_message("Incorrect password")
        return

    if new_password != new_password2:
        show_message("passwords do not match")
        return

    wallet.use_encryption = (new_password != '')
    wallet.seed = wallet.pw_encode( seed, new_password)
    for k in wallet.imported_keys.keys():
        a = wallet.imported_keys[k]
        b = wallet.pw_decode(a, password)
        c = wallet.pw_encode(b, new_password)
        wallet.imported_keys[k] = c
    wallet.save()

    if icon:
        if wallet.use_encryption:
            icon.set_tooltip_text('wallet is encrypted')
        else:
            icon.set_tooltip_text('wallet is unencrypted')


def add_help_button(hbox, message):
    button = gtk.Button('?')
    button.connect("clicked", lambda x: show_message(message))
    button.show()
    hbox.pack_start(button,False, False)


class MyWindow(gtk.Window): __gsignals__ = dict( mykeypress = (gobject.SIGNAL_RUN_LAST | gobject.SIGNAL_ACTION, None, (str,)) )

gobject.type_register(MyWindow)
gtk.binding_entry_add_signal(MyWindow, gtk.keysyms.W, gtk.gdk.CONTROL_MASK, 'mykeypress', str, 'ctrl+W')
gtk.binding_entry_add_signal(MyWindow, gtk.keysyms.Q, gtk.gdk.CONTROL_MASK, 'mykeypress', str, 'ctrl+Q')


class BitcoinGUI:

    def show_message(self, msg):
        show_message(msg, self.window)

    def __init__(self, wallet):
        self.error = ''
        self.wallet = wallet
        self.wallet.interface.is_connected = False
        self.period = 5

        self.window = MyWindow(gtk.WINDOW_TOPLEVEL)
        self.window.set_title(APP_NAME + " " + self.wallet.electrum_version)
        self.window.connect("destroy", gtk.main_quit)
        self.window.set_border_width(0)
        self.window.connect('mykeypress', gtk.main_quit)
        self.window.set_default_size(720, 350)

        vbox = gtk.VBox()

        self.notebook = gtk.Notebook()
        self.create_history_tab()
        self.create_send_tab()
        self.create_recv_tab()
        self.create_book_tab()
        self.create_about_tab()
        self.notebook.show()
        vbox.pack_start(self.notebook, True, True, 2)
        
        self.status_bar = gtk.Statusbar()
        vbox.pack_start(self.status_bar, False, False, 0)

        self.status_image = gtk.Image()
        self.status_image.set_from_stock(gtk.STOCK_NO, gtk.ICON_SIZE_MENU)
        self.status_image.set_alignment(True, 0.5  )
        self.status_image.show()

        self.network_button = gtk.Button()
        self.network_button.connect("clicked", lambda x: run_network_dialog(self.wallet, self.window) )
        self.network_button.add(self.status_image)
        self.network_button.set_relief(gtk.RELIEF_NONE)
        self.network_button.show()
        self.status_bar.pack_end(self.network_button, False, False)

        def seedb(w, wallet):
            if wallet.use_encryption:
                password = password_dialog(self.window)
                if not password: return
            else: password = None
            show_seed_dialog(wallet, password, self.window)
        button = gtk.Button('S')
        button.connect("clicked", seedb, wallet )
        button.set_relief(gtk.RELIEF_NONE)
        button.show()
        self.status_bar.pack_end(button,False, False)

        settings_icon = gtk.Image()
        settings_icon.set_from_stock(gtk.STOCK_PREFERENCES, gtk.ICON_SIZE_MENU)
        settings_icon.set_alignment(0.5, 0.5)
        settings_icon.set_size_request(16,16 )
        settings_icon.show()

        prefs_button = gtk.Button()
        prefs_button.connect("clicked", lambda x: run_settings_dialog(self.wallet, self.window) )
        prefs_button.add(settings_icon)
        prefs_button.set_tooltip_text("Settings")
        prefs_button.set_relief(gtk.RELIEF_NONE)
        prefs_button.show()
        self.status_bar.pack_end(prefs_button,False,False)

        pw_icon = gtk.Image()
        pw_icon.set_from_stock(gtk.STOCK_DIALOG_AUTHENTICATION, gtk.ICON_SIZE_MENU)
        pw_icon.set_alignment(0.5, 0.5)
        pw_icon.set_size_request(16,16 )
        pw_icon.show()

        password_button = gtk.Button()
        password_button.connect("clicked", lambda x: change_password_dialog(self.wallet, self.window, pw_icon))
        password_button.add(pw_icon)
        password_button.set_relief(gtk.RELIEF_NONE)
        password_button.show()
        self.status_bar.pack_end(password_button,False,False)

        self.window.add(vbox)
        self.window.show_all()
        #self.fee_box.hide()

        self.context_id = self.status_bar.get_context_id("statusbar")
        self.update_status_bar()

        def update_status_bar_thread():
            while True:
                gobject.idle_add( self.update_status_bar )
                time.sleep(0.5)


        def check_recipient_thread():
            old_r = ''
            while True:
                time.sleep(0.5)
                if self.payto_entry.is_focus():
                    continue
                r = self.payto_entry.get_text()
                if r != old_r:
                    old_r = r
                    r = r.strip()
                    if re.match('^(|([\w\-\.]+)@)((\w[\w\-]+\.)+[\w\-]+)$', r):
                        try:
                            to_address = self.get_alias(r, interactive=False)
                        except:
                            continue
                        if to_address:
                            s = r + ' <' + to_address + '>'
                            gobject.idle_add( lambda: self.payto_entry.set_text(s) )
                

        def update_wallet_thread():
            while True:
                try:
                    self.wallet.interface.is_connected = False
                    self.wallet.interface.new_session(self.wallet.all_addresses(), self.wallet.electrum_version)
                    self.update_session = False
                    self.info.set_text( self.wallet.interface.message)
                except:
                    traceback.print_exc(file=sys.stdout)
                    time.sleep(self.period)
                    continue

                get_servers_time = 0
                while True:
                    try:
                        if self.wallet.interface.is_connected and self.update_session:
                            self.wallet.interface.update_session( self.wallet.all_addresses() )
                            self.update_session = False

                        if time.time() - get_servers_time > 5*60:
                            wallet.interface.get_servers()
                        get_servers_time = time.time()
                        
                        self.period = 15 if self.wallet.interface.use_http() else 5
                        if self.wallet.update():
                            self.wallet.interface.update_session( self.wallet.all_addresses() )
                            gobject.idle_add( self.update_history_tab )
                            gobject.idle_add( self.update_receiving_tab )
                            # addressbook too...

                        time.sleep(self.period)
                    except BaseException:
                        traceback.print_exc(file=sys.stdout)
                        print "starting new session"
                        break
                    except socket.gaierror:
                        self.wallet.interface.is_connected = False
                        break
                    except:
                        self.wallet.interface.is_connected = False
                        print "error"
                        traceback.print_exc(file=sys.stdout)
                        break
                self.error = '' if self.wallet.interface.is_connected else "Not connected"
                    
        thread.start_new_thread(update_wallet_thread, ())
        thread.start_new_thread(update_status_bar_thread, ())
        thread.start_new_thread(check_recipient_thread, ())
        self.notebook.set_current_page(0)


    def add_tab(self, page, name):
        tab_label = gtk.Label(name)
        tab_label.show()
        self.notebook.append_page(page, tab_label)


    def create_send_tab(self):
        
        page = vbox = gtk.VBox()
        page.show()

        payto = gtk.HBox()
        payto_label = gtk.Label('Pay to:')
        payto_label.set_size_request(100,-1)
        payto.pack_start(payto_label, False)
        payto_entry = gtk.Entry()
        payto_entry.set_size_request(450, 26)
        payto.pack_start(payto_entry, False)
        vbox.pack_start(payto, False, False, 5)

        message = gtk.HBox()
        message_label = gtk.Label('Description:')
        message_label.set_size_request(100,-1)
        message.pack_start(message_label, False)
        message_entry = gtk.Entry()
        message_entry.set_size_request(450, 26)
        message.pack_start(message_entry, False)
        vbox.pack_start(message, False, False, 5)

        amount_box = gtk.HBox()
        amount_label = gtk.Label('Amount:')
        amount_label.set_size_request(100,-1)
        amount_box.pack_start(amount_label, False)
        amount_entry = gtk.Entry()
        amount_entry.set_size_request(120, -1)
        amount_box.pack_start(amount_entry, False)
        vbox.pack_start(amount_box, False, False, 5)

        self.fee_box = fee_box = gtk.HBox()
        fee_label = gtk.Label('Fee:')
        fee_label.set_size_request(100,-1)
        fee_box.pack_start(fee_label, False)
        fee_entry = gtk.Entry()
        fee_entry.set_size_request(60, 26)
        fee_box.pack_start(fee_entry, False)
        vbox.pack_start(fee_box, False, False, 5)

        end_box = gtk.HBox()
        empty_label = gtk.Label('')
        empty_label.set_size_request(100,-1)
        end_box.pack_start(empty_label, False)
        send_button = gtk.Button("Send")
        send_button.show()
        end_box.pack_start(send_button, False, False, 0)
        clear_button = gtk.Button("Clear")
        clear_button.show()
        end_box.pack_start(clear_button, False, False, 15)
        send_button.connect("clicked", self.do_send, (payto_entry, message_entry, amount_entry, fee_entry))
        clear_button.connect("clicked", self.do_clear, (payto_entry, message_entry, amount_entry, fee_entry))

        vbox.pack_start(end_box, False, False, 5)

        # display this line only if there is a signature
        payto_sig = gtk.HBox()
        payto_sig_id = gtk.Label('')
        payto_sig.pack_start(payto_sig_id, False)
        vbox.pack_start(payto_sig, True, True, 5)
        

        self.user_fee = False

        def entry_changed( entry, is_fee ):
            amount = numbify(amount_entry)
            fee = numbify(fee_entry)
            if not is_fee: fee = None
            if amount is None: 
                #self.fee_box.hide();
                return
            inputs, total, fee = self.wallet.choose_tx_inputs( amount, fee )
            if not is_fee:
                fee_entry.set_text( str( Decimal( fee ) / 100000000 ) )
                self.fee_box.show()
            if inputs:
                amount_entry.modify_text(gtk.STATE_NORMAL, gtk.gdk.color_parse("#000000"))
                fee_entry.modify_text(gtk.STATE_NORMAL, gtk.gdk.color_parse("#000000"))
                send_button.set_sensitive(True)
                self.error = ''
            else:
                send_button.set_sensitive(False)
                amount_entry.modify_text(gtk.STATE_NORMAL, gtk.gdk.color_parse("#cc0000"))
                fee_entry.modify_text(gtk.STATE_NORMAL, gtk.gdk.color_parse("#cc0000"))
                self.error = 'Not enough funds'

        amount_entry.connect('changed', entry_changed, False)
        fee_entry.connect('changed', entry_changed, True)        

        self.payto_entry = payto_entry
        self.payto_fee_entry = fee_entry
        self.payto_sig_id = payto_sig_id
        self.payto_sig = payto_sig
        self.amount_entry = amount_entry
        self.message_entry = message_entry
        self.add_tab(page, 'Send')

    def set_frozen(self,entry,frozen):
        if frozen:
            entry.set_editable(False)
            entry.set_has_frame(False)
            entry.modify_base(gtk.STATE_NORMAL, gtk.gdk.color_parse("#eeeeee"))
        else:
            entry.set_editable(True)
            entry.set_has_frame(True)
            entry.modify_base(gtk.STATE_NORMAL, gtk.gdk.color_parse("#ffffff"))


    def set_send_tab(self, payto, amount, message, label, identity, signature, cmd):
        self.notebook.set_current_page(1)

        if signature:
            if re.match('^(|([\w\-\.]+)@)((\w[\w\-]+\.)+[\w\-]+)$', identity):
                signing_address = self.get_alias(identity, interactive = True)
            elif self.wallet.is_valid(identity):
                signing_address = identity
            else:
                signing_address = None
            if not signing_address:
                return
            try:
                self.wallet.verify_message(signing_address, signature, cmd )
                self.wallet.receipt = (signing_address, signature, cmd)
            except:
                self.show_message('Warning: the URI contains a bad signature.\nThe identity of the recipient cannot be verified.')
                payto = amount = label = identity = message = ''

        # redundant with aliases
        #if label and payto:
        #    self.labels[payto] = label
        if re.match('^(|([\w\-\.]+)@)((\w[\w\-]+\.)+[\w\-]+)$', payto):
            payto_address = self.get_alias(payto, interactive=True)
            if payto_address:
                payto = payto + ' <' + payto_address + '>'

        self.payto_entry.set_text(payto)
        self.message_entry.set_text(message)
        self.amount_entry.set_text(amount)
        if identity:
            self.set_frozen(self.payto_entry,True)
            self.set_frozen(self.amount_entry,True)
            self.set_frozen(self.message_entry,True)
            self.payto_sig_id.set_text( '      The bitcoin URI was signed by ' + identity )
        else:
            self.payto_sig.set_visible(False)

    def create_about_tab(self):
        page = gtk.VBox()
        page.show()
        tv = gtk.TextView()
        tv.set_editable(False)
        tv.set_cursor_visible(False)
        page.pack_start(tv)
        self.info = tv.get_buffer()
        self.add_tab(page, 'Wall')

    def do_clear(self, w, data):
        self.payto_sig.set_visible(False)
        self.payto_fee_entry.set_text('')
        for entry in [self.payto_entry,self.amount_entry,self.message_entry]:
            self.set_frozen(entry,False)
            entry.set_text('')


    def question(self,msg):
        dialog = gtk.MessageDialog( self.window, gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT, gtk.MESSAGE_QUESTION, gtk.BUTTONS_OK_CANCEL, msg)
        dialog.show()
        result = dialog.run()
        dialog.destroy()
        return result == gtk.RESPONSE_OK

    def get_alias(self, alias, interactive = False):
        try:
            target, signing_address, auth_name = self.wallet.read_alias(alias)
        except BaseException, e:
            # raise exception if verify fails (verify the chain)
            if interactive:
                self.show_message("Alias error: " + e.message)
            return

        print target, signing_address, auth_name

        if auth_name is None:
            a = self.wallet.aliases.get(alias)
            if not a:
                msg = "Warning: the alias '%s' is self-signed. The signing address is %s. Do you want to trust this alias?"%(alias,signing_address)
                if interactive and self.question( msg ):
                    self.wallet.aliases[alias] = (signing_address, target)
                else:
                    target = None
            else:
                if signing_address != a[0]:
                    msg = "Warning: the key of alias '%s' has changed since your last visit! It is possible that someone is trying to do something nasty!!!\nDo you accept to change your trusted key?"%alias
                    if interactive and self.question( msg ):
                        self.wallet.aliases[alias] = (signing_address, target)
                    else:
                        target = None
        else:
            if signing_address not in self.wallet.authorities.keys():
                msg = "The alias: '%s' links to %s\n\nWarning: this alias was signed by an unknown key.\nSigning authority: %s\nSigning address: %s\n\nDo you want to add this key to your list of trusted keys?"%(alias,target,auth_name,signing_address)
                if interactive and self.question( msg ):
                    self.wallet.authorities[signing_address] = auth_name
                else:
                    target = None

        if target:
            self.wallet.aliases[alias] = (signing_address, target)
            self.update_sending_tab()

            
        return target
            


    def do_send(self, w, data):
        payto_entry, label_entry, amount_entry, fee_entry = data
        label = label_entry.get_text()
        r = payto_entry.get_text()
        r = r.strip()

        m1 = re.match('^(|([\w\-\.]+)@)((\w[\w\-]+\.)+[\w\-]+)$', r)
        m2 = re.match('(|([\w\-\.]+)@)((\w[\w\-]+\.)+[\w\-]+) \<([1-9A-HJ-NP-Za-km-z]{26,})\>', r)
        
        if m1:
            to_address = self.get_alias(r, interactive = True)
            if not to_address:
                return
        elif m2:
            to_address = m2.group(5)
        else:
            to_address = r

        if not self.wallet.is_valid(to_address):
            self.show_message( "invalid bitcoin address:\n"+to_address)
            return

        try:
            amount = int( Decimal(amount_entry.get_text()) * 100000000 )
        except:
            self.show_message( "invalid amount")
            return
        try:
            fee = int( Decimal(fee_entry.get_text()) * 100000000 )
        except:
            self.show_message( "invalid fee")
            return

        if self.wallet.use_encryption:
            password = password_dialog(self.window)
            if not password:
                return
        else:
            password = None

        try:
            tx = self.wallet.mktx( to_address, amount, label, password, fee )
        except BaseException, e:
            self.show_message(e.message)
            return
            
        self.update_session = True # we created a new change address

        status, msg = self.wallet.sendtx( tx )
        if status:
            self.show_message( "payment sent.\n" + msg )
            payto_entry.set_text("")
            label_entry.set_text("")
            amount_entry.set_text("")
            fee_entry.set_text("")
            #self.fee_box.hide()
            self.update_sending_tab()
        else:
            self.show_message( msg )


    def treeview_button_press(self, treeview, event):
        if event.type == gtk.gdk._2BUTTON_PRESS:
            c = treeview.get_cursor()[0]
            if treeview == self.history_treeview:
                tx_details = self.history_list.get_value( self.history_list.get_iter(c), 8)
                self.show_message(tx_details)
            elif treeview == self.contacts_treeview:
                m = self.addressbook_list.get_value( self.addressbook_list.get_iter(c), 0)
                a = self.wallet.aliases.get(m)
                if a:
                    if a[0] in self.wallet.authorities.keys():
                        s = self.wallet.authorities.get(a[0])
                    else:
                        s = "self"
                    msg = 'Alias:'+ m + '\n\nTarget: '+ a[1] + '\nSigned by: ' + s + '\nSigning address:' + a[0]
                    self.show_message(msg)
            

    def treeview_key_press(self, treeview, event):
        c = treeview.get_cursor()[0]
        if event.keyval == gtk.keysyms.Up:
            if c and c[0] == 0:
                treeview.parent.grab_focus()
                treeview.set_cursor((0,))
        elif event.keyval == gtk.keysyms.Return:
            if treeview == self.history_treeview:
                tx_details = self.history_list.get_value( self.history_list.get_iter(c), 8)
                self.show_message(tx_details)
            elif treeview == self.contacts_treeview:
                m = self.addressbook_list.get_value( self.addressbook_list.get_iter(c), 0)
                a = self.wallet.aliases.get(m)
                if a:
                    if a[0] in self.wallet.authorities.keys():
                        s = self.wallet.authorities.get(a[0])
                    else:
                        s = "self"
                    msg = 'Alias:'+ m + '\n\nTarget: '+ a[1] + '\nSigned by: ' + s + '\nSigning address:' + a[0]
                    self.show_message(msg)

        return False

    def create_history_tab(self):

        self.history_list = gtk.ListStore(str, str, str, str, 'gboolean',  str, str, str, str)
        treeview = gtk.TreeView(model=self.history_list)
        self.history_treeview = treeview
        treeview.set_tooltip_column(7)
        treeview.show()
        treeview.connect('key-press-event', self.treeview_key_press)
        treeview.connect('button-press-event', self.treeview_button_press)

        tvcolumn = gtk.TreeViewColumn('')
        treeview.append_column(tvcolumn)
        cell = gtk.CellRendererPixbuf()
        tvcolumn.pack_start(cell, False)
        tvcolumn.set_attributes(cell, stock_id=1)

        tvcolumn = gtk.TreeViewColumn('Date')
        treeview.append_column(tvcolumn)
        cell = gtk.CellRendererText()
        tvcolumn.pack_start(cell, False)
        tvcolumn.add_attribute(cell, 'text', 2)

        tvcolumn = gtk.TreeViewColumn('Description')
        treeview.append_column(tvcolumn)
        cell = gtk.CellRendererText()
        cell.set_property('foreground', 'grey')
        cell.set_property('family', 'monospace')
        cell.set_property('editable', True)
        def edited_cb(cell, path, new_text, h_list):
            tx = h_list.get_value( h_list.get_iter(path), 0)
            self.wallet.labels[tx] = new_text
            self.wallet.save() 
            self.update_history_tab()
        cell.connect('edited', edited_cb, self.history_list)
        def editing_started(cell, entry, path, h_list):
            tx = h_list.get_value( h_list.get_iter(path), 0)
            if not self.wallet.labels.get(tx): entry.set_text('')
        cell.connect('editing-started', editing_started, self.history_list)
        tvcolumn.set_expand(True)
        tvcolumn.pack_start(cell, True)
        tvcolumn.set_attributes(cell, text=3, foreground_set = 4)

        tvcolumn = gtk.TreeViewColumn('Amount')
        treeview.append_column(tvcolumn)
        cell = gtk.CellRendererText()
        cell.set_alignment(1, 0.5)
        cell.set_property('family', 'monospace')
        tvcolumn.pack_start(cell, False)
        tvcolumn.add_attribute(cell, 'text', 5)

        tvcolumn = gtk.TreeViewColumn('Balance')
        treeview.append_column(tvcolumn)
        cell = gtk.CellRendererText()
        cell.set_alignment(1, 0.5)
        cell.set_property('family', 'monospace')
        tvcolumn.pack_start(cell, False)
        tvcolumn.add_attribute(cell, 'text', 6)

        tvcolumn = gtk.TreeViewColumn('Tooltip')
        treeview.append_column(tvcolumn)
        cell = gtk.CellRendererText()
        tvcolumn.pack_start(cell, False)
        tvcolumn.add_attribute(cell, 'text', 7)
        tvcolumn.set_visible(False)

        scroll = gtk.ScrolledWindow()
        scroll.set_policy(gtk.POLICY_NEVER, gtk.POLICY_AUTOMATIC)
        scroll.add(treeview)

        self.add_tab(scroll, 'History')
        self.update_history_tab()


    def create_recv_tab(self):
        self.recv_list = gtk.ListStore(str, str, str)
        self.add_tab( self.make_address_list(True), 'Receive')
        self.update_receiving_tab()

    def create_book_tab(self):
        self.addressbook_list = gtk.ListStore(str, str, str)
        self.add_tab( self.make_address_list(False), 'Contacts')
        self.update_sending_tab()

    def make_address_list(self, is_recv):
        liststore = self.recv_list if is_recv else self.addressbook_list
        treeview = gtk.TreeView(model= liststore)
        treeview.connect('key-press-event', self.treeview_key_press)
        treeview.connect('button-press-event', self.treeview_button_press)
        treeview.show()
        if not is_recv:
            self.contacts_treeview = treeview

        tvcolumn = gtk.TreeViewColumn('Address')
        treeview.append_column(tvcolumn)
        cell = gtk.CellRendererText()
        cell.set_property('family', 'monospace')
        tvcolumn.pack_start(cell, True)
        tvcolumn.add_attribute(cell, 'text', 0)

        tvcolumn = gtk.TreeViewColumn('Label')
        tvcolumn.set_expand(True)
        treeview.append_column(tvcolumn)
        cell = gtk.CellRendererText()
        cell.set_property('editable', True)
        def edited_cb2(cell, path, new_text, liststore):
            address = liststore.get_value( liststore.get_iter(path), 0)
            self.wallet.labels[address] = new_text
            self.wallet.save() 
            self.wallet.update_tx_labels()
            self.update_receiving_tab()
            self.update_sending_tab()
            self.update_history_tab()
        cell.connect('edited', edited_cb2, liststore)
        tvcolumn.pack_start(cell, True)
        tvcolumn.add_attribute(cell, 'text', 1)

        tvcolumn = gtk.TreeViewColumn('Tx')
        treeview.append_column(tvcolumn)
        cell = gtk.CellRendererText()
        tvcolumn.pack_start(cell, True)
        tvcolumn.add_attribute(cell, 'text', 2)

        scroll = gtk.ScrolledWindow()
        scroll.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
        scroll.add(treeview)

        hbox = gtk.HBox()
        if not is_recv:
            button = gtk.Button("New")
            button.connect("clicked", self.newaddress_dialog)
            button.show()
            hbox.pack_start(button,False)

        def showqrcode(w, treeview, liststore):
            path, col = treeview.get_cursor()
            if not path: return
            address = liststore.get_value(liststore.get_iter(path), 0)
            qr = pyqrnative.QRCode(4, pyqrnative.QRErrorCorrectLevel.H)
            qr.addData(address)
            qr.make()
            boxsize = 7
            size = qr.getModuleCount()*boxsize
            def area_expose_cb(area, event):
                style = area.get_style()
                k = qr.getModuleCount()
                for r in range(k):
                    for c in range(k):
                        gc = style.black_gc if qr.isDark(r, c) else style.white_gc
                        area.window.draw_rectangle(gc, True, c*boxsize, r*boxsize, boxsize, boxsize)
            area = gtk.DrawingArea()
            area.set_size_request(size, size)
            area.connect("expose-event", area_expose_cb)
            area.show()
            dialog = gtk.Dialog(address, parent=self.window, flags=gtk.DIALOG_MODAL|gtk.DIALOG_NO_SEPARATOR, buttons = ("ok",1))
            dialog.vbox.add(area)
            dialog.run()
            dialog.destroy()

        button = gtk.Button("QR")
        button.connect("clicked", showqrcode, treeview, liststore)
        button.show()
        hbox.pack_start(button,False)

        button = gtk.Button("Copy to clipboard")
        def copy2clipboard(w, treeview, liststore):
            import platform
            path, col =  treeview.get_cursor()
            if path:
                address =  liststore.get_value( liststore.get_iter(path), 0)
                if platform.system() == 'Windows':
                    from Tkinter import Tk
                    r = Tk()
                    r.withdraw()
                    r.clipboard_clear()
                    r.clipboard_append( address )
                    r.destroy()
                else:
                    c = gtk.clipboard_get()
                    c.set_text( address )
        button.connect("clicked", copy2clipboard, treeview, liststore)
        button.show()
        hbox.pack_start(button,False)

        if not is_recv:
            button = gtk.Button("Pay to")
            def payto(w, treeview, liststore):
                path, col =  treeview.get_cursor()
                if path:
                    address =  liststore.get_value( liststore.get_iter(path), 0)
                    self.payto_entry.set_text( address )
                    self.notebook.set_current_page(1)
                    self.amount_entry.grab_focus()

            button.connect("clicked", payto, treeview, liststore)
            button.show()
            hbox.pack_start(button,False)

        vbox = gtk.VBox()
        vbox.pack_start(scroll,True)
        vbox.pack_start(hbox, False)
        return vbox

    def update_status_bar(self):
        c, u = self.wallet.get_balance()
        if self.wallet.interface.is_connected:
            self.status_image.set_from_stock(gtk.STOCK_YES, gtk.ICON_SIZE_MENU)
            self.network_button.set_tooltip_text("Connected to %s.\n%d blocks\nresponse time: %f"%(self.wallet.interface.host, self.wallet.interface.blocks, self.wallet.interface.rtime))
        else:
            self.status_image.set_from_stock(gtk.STOCK_NO, gtk.ICON_SIZE_MENU)
            self.network_button.set_tooltip_text("Trying to contact %s.\n%d blocks"%(self.wallet.interface.host, self.wallet.interface.blocks))
        text =  "Balance: %s "%( format_satoshis(c) )
        if u: text +=  "[%s unconfirmed]"%( format_satoshis(u,True) )
        if self.error: text = self.error
        self.status_bar.pop(self.context_id) 
        self.status_bar.push(self.context_id, text) 

    def update_receiving_tab(self):
        self.recv_list.clear()
        for address in self.wallet.all_addresses():
            if self.wallet.is_change(address):continue
            label = self.wallet.labels.get(address)
            n = 0 
            h = self.wallet.history.get(address,[])
            for item in h:
                if not item['is_in'] : n=n+1
            tx = "None" if n==0 else "%d"%n
            self.recv_list.append((address, label, tx ))

    def update_sending_tab(self):
        # detect addresses that are not mine in history, add them here...
        self.addressbook_list.clear()
        for alias, v in self.wallet.aliases.items():
            s, target = v
            label = self.wallet.labels.get(alias)
            self.addressbook_list.append((alias, label, '-'))
            
        for address in self.wallet.addressbook:
            label = self.wallet.labels.get(address)
            n = 0 
            for item in self.wallet.tx_history.values():
                if address in item['outputs'] : n=n+1
            tx = "None" if n==0 else "%d"%n
            self.addressbook_list.append((address, label, tx))

    def update_history_tab(self):
        cursor = self.history_treeview.get_cursor()[0]
        self.history_list.clear()
        balance = 0 
        for tx in self.wallet.get_tx_history():
            tx_hash = tx['tx_hash']
            if tx['height']:
                conf = self.wallet.interface.blocks - tx['height'] + 1
                time_str = datetime.datetime.fromtimestamp( tx['nTime']).isoformat(' ')[:-3]
                conf_icon = gtk.STOCK_APPLY
            else:
                conf = 0
                time_str = 'pending'
                conf_icon = gtk.STOCK_EXECUTE
            v = tx['value']
            balance += v 
            label = self.wallet.labels.get(tx_hash)
            is_default_label = (label == '') or (label is None)
            if is_default_label: label = tx['default_label']
            tooltip = tx_hash + "\n%d confirmations"%conf 

            # tx = self.wallet.tx_history.get(tx_hash)
            details = "Transaction Details:\n\n" \
                      + "Transaction ID:\n" + tx_hash + "\n\n" \
                      + "Status: %d confirmations\n\n"%conf  \
                      + "Date: %s\n\n"%time_str \
                      + "Inputs:\n-"+ '\n-'.join(tx['inputs']) + "\n\n" \
                      + "Outputs:\n-"+ '\n-'.join(tx['outputs'])
            r = self.wallet.receipts.get(tx_hash)
            if r:
                details += "\n_______________________________________" \
                           + '\n\nSigned URI: ' + r[2] \
                           + "\n\nSigned by: " + r[0] \
                           + '\n\nSignature: ' + r[1]
                

            self.history_list.prepend( [tx_hash, conf_icon, time_str, label, is_default_label,
                                        format_satoshis(v,True), format_satoshis(balance), tooltip, details] )
        if cursor: self.history_treeview.set_cursor( cursor )



    def newaddress_dialog(self, w):

        title = "New sending address" 
        dialog = gtk.Dialog(title, parent=self.window, 
                            flags=gtk.DIALOG_MODAL|gtk.DIALOG_NO_SEPARATOR, 
                            buttons= ("cancel", 0, "ok",1)  )
        dialog.show()

        label = gtk.HBox()
        label_label = gtk.Label('Label:')
        label_label.set_size_request(120,10)
        label_label.show()
        label.pack_start(label_label)
        label_entry = gtk.Entry()
        label_entry.show()
        label.pack_start(label_entry)
        label.show()
        dialog.vbox.pack_start(label, False, True, 5)

        address = gtk.HBox()
        address_label = gtk.Label('Address:')
        address_label.set_size_request(120,10)
        address_label.show()
        address.pack_start(address_label)
        address_entry = gtk.Entry()
        address_entry.show()
        address.pack_start(address_entry)
        address.show()
        dialog.vbox.pack_start(address, False, True, 5)
        
        result = dialog.run()
        address = address_entry.get_text()
        label = label_entry.get_text()
        dialog.destroy()

        if result == 1:
            if self.wallet.is_valid(address):
                self.wallet.addressbook.append(address)
                if label:  self.wallet.labels[address] = label
                self.wallet.save()
                self.update_sending_tab()
            else:
                errorDialog = gtk.MessageDialog(
                    parent=self.window,
                    flags=gtk.DIALOG_MODAL, 
                    buttons= gtk.BUTTONS_CLOSE, 
                    message_format = "Invalid address")
                errorDialog.show()
                errorDialog.run()
                errorDialog.destroy()

    
    def main(self):
        gtk.main()