electrum/plugins/labels.py

from electrum.util import print_error
from electrum_gui.i18n import _
import httplib, urllib
import hashlib
import json
from urlparse import urlparse, parse_qs
try:
    import PyQt4
except:
    sys.exit("Error: Could not import PyQt4 on Linux systems, you may try 'sudo apt-get install python-qt4'")

from PyQt4.QtGui import *
from PyQt4.QtCore import *
import PyQt4.QtCore as QtCore
import PyQt4.QtGui as QtGui
from electrum_gui import bmp, pyqrnative, BasePlugin
from electrum_gui.i18n import _

class Plugin(BasePlugin):

    def __init__(self, gui):
        self.target_host = 'labelectrum.herokuapp.com'
        BasePlugin.__init__(self, gui, 'labels', _('Label Sync'),_('This plugin can sync your labels accross multiple Electrum installs by using a remote database to save your data. Labels are not encrypted, \
transactions and addresses are however. This code might increase the load of your wallet with a few micoseconds as it will sync labels on each startup.\n\n\
To get started visit http://labelectrum.herokuapp.com/ to sign up for an account.'))

        self.wallet = gui.wallet
        self.gui = gui
        self.config = gui.config
        self.labels = self.wallet.labels
        self.transactions = self.wallet.transactions

        self.wallet_id = hashlib.sha256(str(self.config.get("master_public_key"))).digest().encode('hex')

        addresses = [] 
        for k, account in self.wallet.accounts.items():
            for address in account[0]:
                addresses.append(address)

        self.addresses = addresses

    def auth_token(self):
        return self.config.get("plugin_label_api_key")

    def init_gui(self):
        if self.is_enabled() and self.auth_token():
            # If there is an auth token we can try to actually start syncing
            self.full_pull()

    def is_available(self):
        return True

    def requires_settings(self):
        return True

    def set_label(self, item,label, changed):
        if not changed:
            return 

        hashed = hashlib.sha256(item).digest().encode('hex')
        bundle = {"label": {"external_id": hashed, "text": label}}
        params = json.dumps(bundle)
        connection = httplib.HTTPConnection(self.target_host)
        connection.request("POST", ("/api/wallets/%s/labels.json?auth_token=%s" % (self.wallet_id, self.auth_token())), params, {'Content-Type': 'application/json'})

        response = connection.getresponse()
        if response.reason == httplib.responses[httplib.NOT_FOUND]:
            return
        response = json.loads(response.read())

    def settings_dialog(self):
        def check_for_api_key(api_key):
            if api_key and len(api_key) > 12:
              self.config.set_key("plugin_label_api_key", str(self.auth_token_edit.text()))
              self.upload.setEnabled(True)
              self.download.setEnabled(True)
              self.accept.setEnabled(True)
            else:
              self.upload.setEnabled(False)
              self.download.setEnabled(False)
              self.accept.setEnabled(False)

        d = QDialog(self.gui)
        layout = QGridLayout(d)
        layout.addWidget(QLabel("API Key: "),0,0)

        self.auth_token_edit = QLineEdit(self.auth_token())
        self.auth_token_edit.textChanged.connect(check_for_api_key)

        layout.addWidget(self.auth_token_edit, 0,1,1,2)
        layout.addWidget(QLabel("Label sync options: "),1,0)

        self.upload = QPushButton("Force upload")
        self.upload.clicked.connect(self.full_push)
        layout.addWidget(self.upload, 1,1)

        self.download = QPushButton("Force download")
        self.download.clicked.connect(lambda: self.full_pull(True))
        layout.addWidget(self.download, 1,2)

        c = QPushButton(_("Cancel"))
        c.clicked.connect(d.reject)

        self.accept = QPushButton(_("Done"))
        self.accept.clicked.connect(d.accept)

        layout.addWidget(c,2,1)
        layout.addWidget(self.accept,2,2)

        check_for_api_key(self.auth_token())

        if d.exec_():
          return True
        else:
          return False

    def toggle(self):
        enabled = not self.is_enabled()
        self.set_enabled(enabled)
        self.init_gui()

        if not self.auth_token() and enabled: # First run, throw plugin settings in your face
            if self.settings_dialog():
              self.set_enabled(True)
              return True
            else:
              self.set_enabled(False)
              return False
        return enabled

    def full_push(self):
        if self.do_full_push():
            QMessageBox.information(None, _("Labels uploaded"), _("Your labels have been uploaded."))

    def full_pull(self, force = False):
        if self.do_full_pull(force) and force:
            QMessageBox.information(None, _("Labels synchronized"), _("Your labels have been synchronized."))
            self.gui.update_history_tab()
            self.gui.update_completions()
            self.gui.update_receive_tab()
            self.gui.update_contacts_tab()

    def do_full_push(self):
        bundle = {"labels": {}}
        for key, value in self.labels.iteritems():
            hashed = hashlib.sha256(key).digest().encode('hex')
            bundle["labels"][hashed] = value

        params = json.dumps(bundle)
        connection = httplib.HTTPConnection(self.target_host)
        connection.request("POST", ("/api/wallets/%s/labels/batch.json?auth_token=%s" % (self.wallet_id, self.auth_token())), params, {'Content-Type': 'application/json'})

        response = connection.getresponse()
        if response.reason == httplib.responses[httplib.NOT_FOUND]:
            return
        try:
            response = json.loads(response.read())
        except ValueError as e:
            return False

        if "error" in response:
            QMessageBox.warning(None, _("Error"),_("Could not sync labels: %s" % response["error"]))
            return False

        return True

    def do_full_pull(self, force = False):
        connection = httplib.HTTPConnection(self.target_host)
        connection.request("GET", ("/api/wallets/%s/labels.json?auth_token=%s" % (self.wallet_id, self.auth_token())),"", {'Content-Type': 'application/json'})
        response = connection.getresponse()
        if response.reason == httplib.responses[httplib.NOT_FOUND]:
            return
        try:
            response = json.loads(response.read())
        except ValueError as e:
            return False

        if "error" in response:
            QMessageBox.warning(None, _("Error"),_("Could not sync labels: %s" % response["error"]))
            return False

        for label in response:
            for key in self.addresses:
                target_hashed = hashlib.sha256(key).digest().encode('hex')
                if label["external_id"] == target_hashed:
                   if force or not self.labels.get(key):
                       self.labels[key] = label["text"] 
            for key, value in self.transactions.iteritems():
                target_hashed = hashlib.sha256(key).digest().encode('hex')
                if label["external_id"] == target_hashed:
                   if force or not self.labels.get(key):
                       self.labels[key] = label["text"] 
        return True