remove GreenAddress instant plugin

GreenAddress instant feature has been removed from the service, thus
there is no reason anymore to keep the plugin

electrum/plugins/greenaddress_instant/__init__.py

@@ -1,5 +0,0 @@
-from electrum.i18n import _
-
-fullname = 'GreenAddress instant'
-description = _("Allows validating if your transactions have instant confirmations by GreenAddress")
-available_for = ['qt']

electrum/plugins/greenaddress_instant/qt.py

@@ -1,112 +0,0 @@
-#!/usr/bin/env python
-#
-# Electrum - lightweight Bitcoin client
-# Copyright (C) 2014 Thomas Voegtlin
-#
-# Permission is hereby granted, free of charge, to any person
-# obtaining a copy of this software and associated documentation files
-# (the "Software"), to deal in the Software without restriction,
-# including without limitation the rights to use, copy, modify, merge,
-# publish, distribute, sublicense, and/or sell copies of the Software,
-# and to permit persons to whom the Software is furnished to do so,
-# subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be
-# included in all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
-# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
-# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-# SOFTWARE.
-
-import base64
-import urllib.parse
-import sys
-from typing import TYPE_CHECKING
-
-from PyQt5.QtWidgets import QApplication, QPushButton
-
-from electrum.plugin import BasePlugin, hook
-from electrum.i18n import _
-from electrum.network import Network
-
-if TYPE_CHECKING:
-    from aiohttp import ClientResponse
-    from electrum.gui.qt.transaction_dialog import TxDialog
-
-
-class Plugin(BasePlugin):
-
-    button_label = _("Verify GA instant")
-
-    @hook
-    def transaction_dialog(self, d: 'TxDialog'):
-        d.verify_button = QPushButton(self.button_label)
-        d.verify_button.clicked.connect(lambda: self.do_verify(d))
-        d.verify_button.setVisible(False)
-        d.buttons.insert(0, d.verify_button)
-
-    def get_my_addr(self, d: 'TxDialog'):
-        """Returns the address for given tx which can be used to request
-        instant confirmation verification from GreenAddress"""
-        for o in d.tx.outputs():
-            if d.wallet.is_mine(o.address):
-                return o.address
-        return None
-
-    @hook
-    def transaction_dialog_update(self, d: 'TxDialog'):
-        if d.tx.is_complete() and self.get_my_addr(d):
-            d.verify_button.setVisible(True)
-        else:
-            d.verify_button.setVisible(False)
-
-    def do_verify(self, d: 'TxDialog'):
-        tx = d.tx
-        wallet = d.wallet
-        window = d.main_window
-
-        if wallet.is_watching_only():
-            d.show_critical(_('This feature is not available for watch-only wallets.'))
-            return
-
-        # 1. get the password and sign the verification request
-        password = None
-        if wallet.has_keystore_encryption():
-            msg = _('GreenAddress requires your signature \n'
-                    'to verify that transaction is instant.\n'
-                    'Please enter your password to sign a\n'
-                    'verification request.')
-            password = window.password_dialog(msg, parent=d)
-            if not password:
-                return
-        try:
-            d.verify_button.setText(_('Verifying...'))
-            QApplication.processEvents()  # update the button label
-
-            addr = self.get_my_addr(d)
-            message = "Please verify if %s is GreenAddress instant confirmed" % tx.txid()
-            sig = wallet.sign_message(addr, message, password)
-            sig = base64.b64encode(sig).decode('ascii')
-
-            # 2. send the request
-            async def handle_request(resp: 'ClientResponse'):
-                resp.raise_for_status()
-                return await resp.json()
-            url = "https://greenaddress.it/verify/?signature=%s&txhash=%s" % (urllib.parse.quote(sig), tx.txid())
-            response = Network.send_http_on_proxy('get', url, headers = {'User-Agent': 'Electrum'}, on_finish=handle_request)
-
-            # 3. display the result
-            if response.get('verified'):
-                d.show_message(_('{} is covered by GreenAddress instant confirmation').format(tx.txid()), title=_('Verification successful!'))
-            else:
-                d.show_warning(_('{} is not covered by GreenAddress instant confirmation').format(tx.txid()), title=_('Verification failed!'))
-        except BaseException as e:
-            self.logger.exception('')
-            d.show_error(repr(e))
-        finally:
-            d.verify_button.setText(self.button_label)