url_image_preview.py 29 KB
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# -*- coding: utf-8 -*-
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##
## This file is part of Gajim.
##
## Gajim 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; version 3 only.
##
## Gajim 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 Gajim.  If not, see <http://www.gnu.org/licenses/>.
##
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import os
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import hashlib
import binascii
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import logging
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from urllib.parse import urlparse
from io import BytesIO
import shutil
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from functools import partial
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from gi.repository import Gtk, Gdk, GLib, GdkPixbuf

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from gajim.common import app
from gajim.common import helpers
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from gajim.common import configpaths
from gajim import dialogs
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from gajim import gtkgui_helpers
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from gajim.plugins import GajimPlugin
from gajim.plugins.helpers import log_calls
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from url_image_preview.http_functions import get_http_head, get_http_file
from url_image_preview.config_dialog import UrlImagePreviewConfigDialog
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from url_image_preview.resize_gif import resize_gif
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log = logging.getLogger('gajim.plugin_system.preview')
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PILLOW_AVAILABLE = True
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try:
    from PIL import Image
except:
    log.debug('Pillow not available')
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    PILLOW_AVAILABLE = False
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try:
    if os.name == 'nt':
        from cryptography.hazmat.backends.openssl import backend
    else:
        from cryptography.hazmat.backends import default_backend
    from cryptography.hazmat.primitives.ciphers import Cipher
    from cryptography.hazmat.primitives.ciphers import algorithms
    from cryptography.hazmat.primitives.ciphers.modes import GCM
    decryption_available = True
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except Exception:
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    DEP_MSG = 'For preview of encrypted images, ' \
              'please install python-cryptography!'
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    log.exception('Error')
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    log.info('Decryption/Encryption disabled due to errors')
    decryption_available = False

ACCEPTED_MIME_TYPES = ('image/png', 'image/jpeg', 'image/gif', 'image/raw',
                       'image/svg+xml', 'image/x-ms-bmp')
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class UrlImagePreviewPlugin(GajimPlugin):
    @log_calls('UrlImagePreviewPlugin')
    def init(self):
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        if not decryption_available:
            self.available_text = DEP_MSG
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        self.config_dialog = partial(UrlImagePreviewConfigDialog, self)
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        self.gui_extension_points = {
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            'chat_control_base': (self.connect_with_chat_control,
                                  self.disconnect_from_chat_control),
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            'history_window':
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                (self.connect_with_history, self.disconnect_from_history),
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            'print_real_text': (self.print_real_text, None), }
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        self.config_default_values = {
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            'PREVIEW_SIZE': (150, 'Preview size(10-512)'),
            'MAX_FILE_SIZE': (524288, 'Max file size for image preview'),
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            'LEFTCLICK_ACTION': ('open_menuitem', 'Open'),
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            'ANONYMOUS_MUC': (False, ''),
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            'GEO_PREVIEW_PROVIDER': ('Google', 'Google Maps'),
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            'VERIFY': (True, ''),}
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        self.controls = {}
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        self.history_window_control = None
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    @log_calls('UrlImagePreviewPlugin')
    def connect_with_chat_control(self, chat_control):
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        account = chat_control.contact.account.name
        jid = chat_control.contact.jid
        if account not in self.controls:
            self.controls[account] = {}
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        self.controls[account][jid] = Base(self, chat_control.conv_textview)
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    @log_calls('UrlImagePreviewPlugin')
    def disconnect_from_chat_control(self, chat_control):
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        account = chat_control.contact.account.name
        jid = chat_control.contact.jid
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        self.controls[account][jid].deinit_handlers()
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        del self.controls[account][jid]
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    @log_calls('UrlImagePreviewPlugin')
    def connect_with_history(self, history_window):
        if self.history_window_control:
            log.error("connect_with_history: deinit handlers")
            self.history_window_control.deinit_handlers()
        log.error("connect_with_history: create base")
        self.history_window_control = Base(
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            self, history_window.history_textview)
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    @log_calls('UrlImagePreviewPlugin')
    def disconnect_from_history(self, history_window):
        if self.history_window_control:
            self.history_window_control.deinit_handlers()
        self.history_window_control = None
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    def print_real_text(self, tv, real_text, text_tags, graphics,
                        iter_, additional_data):
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        if tv.used_in_history_window and self.history_window_control:
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            self.history_window_control.print_real_text(
                real_text, text_tags, graphics, iter_, additional_data)

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        account = tv.account
        for jid in self.controls[account]:
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            if self.controls[account][jid].textview != tv:
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                continue
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            self.controls[account][jid].print_real_text(
                real_text, text_tags, graphics, iter_, additional_data)
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            return
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class Base(object):
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    def __init__(self, plugin, textview):
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        self.plugin = plugin
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        self.textview = textview
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        self.handlers = {}
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        self.directory = os.path.join(configpaths.gajimpaths['MY_DATA'],
                                      'downloads')
        self.thumbpath = os.path.join(configpaths.gajimpaths['MY_CACHE'],
                                      'downloads.thumb')

        try:
            self._create_path(self.directory)
            self._create_path(self.thumbpath)
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        except Exception:
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            log.error("Error creating download and/or thumbnail folder!")
            raise

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    def deinit_handlers(self):
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        # remove all register handlers on wigets, created by self.xml
        # to prevent circular references among objects
        for i in list(self.handlers.keys()):
            if self.handlers[i].handler_is_connected(i):
                self.handlers[i].disconnect(i)
            del self.handlers[i]

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    def print_real_text(self, real_text, text_tags, graphics, iter_,
                        additional_data):
        urlparts = urlparse(real_text)
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        if urlparts.scheme == "geo":
            if self.plugin.config['GEO_PREVIEW_PROVIDER'] == 'no_preview':
                return
        elif (urlparts.scheme not in ["https", "aesgcm"] or not urlparts.netloc):
            if urlparts.scheme != "geo":
                log.info("Not accepting URL scheme '%s' for image preview: %s",
                         urlparts.scheme, real_text)
                return
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        try:
            oob_url = additional_data["gajim"]["oob_url"]
        except (KeyError, AttributeError):
            oob_url = None

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        # allow aesgcm uris without oob marker (aesgcm uris are always
        # httpupload filetransfers)
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        if urlparts.scheme != "aesgcm" and real_text != oob_url:
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            if urlparts.scheme != "geo":
                log.info("Not accepting URL for image preview "
                         "(wrong or no oob data): %s", real_text)
                log.debug("additional_data: %s", additional_data)
                return
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        # Don't print the URL in the message window (in the calling function)
        self.textview.plugin_modified = True

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        buffer_ = self.textview.tv.get_buffer()
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        if not iter_:
            iter_ = buffer_.get_end_iter()

        # Show URL, until image is loaded (if ever)
        ttt = buffer_.get_tag_table()
        repl_start = buffer_.create_mark(None, iter_, True)
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        buffer_.insert_with_tags(iter_, real_text,
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            *[(ttt.lookup(t) if isinstance(t, str) else t) for t in ["url"]])
        repl_end = buffer_.create_mark(None, iter_, True)

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        if not real_text.startswith('geo:'):
            weburl = real_text
            filename = os.path.basename(urlparts.path)
            ext = os.path.splitext(filename)[1]
            name = os.path.splitext(filename)[0]
            namehash = hashlib.sha1(real_text.encode('utf-8')).hexdigest()
            newfilename = name + '_' + namehash + ext
            thumbfilename = name + '_' + namehash + '_thumb_' \
                + str(self.plugin.config['PREVIEW_SIZE']) + ext

            filepath = os.path.join(self.directory, newfilename)
            thumbpath = os.path.join(self.thumbpath, thumbfilename)
            filepaths = [filepath, thumbpath]

            key = ''
            iv = ''
            encrypted = False
            if urlparts.fragment:
                fragment = binascii.unhexlify(urlparts.fragment)
                key = fragment[16:]
                iv = fragment[:16]
                if len(key) == 32 and len(iv) == 16:
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                    encrypted = True
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                if not encrypted:
                    key = fragment[12:]
                    iv = fragment[:12]
                    if len(key) == 32 and len(iv) == 12:
                        encrypted = True

        # Handle geo:-URIs
        if real_text.startswith('geo:'):
            if self.plugin.config['GEO_PREVIEW_PROVIDER'] == 'no_preview':
                return
            size = self.plugin.config['PREVIEW_SIZE']
            geo_provider = self.plugin.config['GEO_PREVIEW_PROVIDER']
            key = ''
            iv = ''
            encrypted = False
            ext = '.png'
            color = 'blue'
            zoom = 16
            location = real_text[4:]
            lat, _, lon = location.partition(',')
            if lon == '':
                return

            filename = 'location_' + geo_provider + '_' \
                + location.replace(',', '_').replace('.', '-')
            newfilename = filename + ext
            thumbfilename = filename + '_thumb_' \
                + str(self.plugin.config['PREVIEW_SIZE']) + ext
            filepath = os.path.join(self.directory, newfilename)
            thumbpath = os.path.join(self.thumbpath, thumbfilename)
            filepaths = [filepath, thumbpath]

            # Google
            if geo_provider == 'Google':
                url = 'https://maps.googleapis.com/maps/api/staticmap?' \
                      'center={}&zoom={}&size={}x{}&markers=color:{}' \
                      '|label:.|{}'.format(location, zoom, size, size,
                                           color, location)
                weburl = 'https://www.google.com/maps/place/{}' \
                         .format(location)
                real_text = url
            else:
                # OpenStreetMap / MapQuest
                apikey = 'F7x36jLVv2hiANVAXmhwvUB044XvGASh'

                url = 'https://open.mapquestapi.com/staticmap/v4/' \
                      'getmap?key={}&center={}&zoom={}&size={},{}&type=map' \
                      '&imagetype=png&pois={},{}&scalebar=false' \
                      .format(apikey, location, zoom, size, size, color,
                          location)
                weburl = 'http://www.openstreetmap.org/' \
                         '?mlat={}&mlon={}#map={}/{}/{}&layers=N' \
                         .format(lat, lon, zoom, lat, lon)
                real_text = url
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        # file exists but thumbnail got deleted
        if os.path.exists(filepath) and not os.path.exists(thumbpath):
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            if urlparts.scheme == 'geo':
                    real_text = weburl
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            with open(filepath, 'rb') as f:
                mem = f.read()
            app.thread_interface(
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                self._save_thumbnail, [thumbpath, mem],
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                self._update_img, [real_text, repl_start,
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                                   repl_end, filepath, encrypted])

        # display thumbnail if already downloadeded
        # (but only if file also exists)
        elif os.path.exists(filepath) and os.path.exists(thumbpath):
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            if urlparts.scheme == 'geo':
                    real_text = weburl
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            app.thread_interface(
                self._load_thumbnail, [thumbpath],
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                self._update_img, [real_text, repl_start,
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                                   repl_end, filepath, encrypted])

        # or download file, calculate thumbnail and finally display it
        else:
            if encrypted and not decryption_available:
                log.debug('Please install Crytography to decrypt pictures')
            else:
                # First get the http head request
                # which does not fetch data, just headers
                # then check the mime type and filesize
                if urlparts.scheme == 'aesgcm':
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                    real_text = 'https://' + real_text[9:]
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                verify = self.plugin.config['VERIFY']
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                app.thread_interface(
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                    get_http_head, [self.textview.account, real_text, verify],
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                    self._check_mime_size, [real_text, weburl, repl_start,
                                            repl_end, filepaths, key, iv,
                                            encrypted])
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    def _save_thumbnail(self, thumbpath, mem):
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        size = self.plugin.config['PREVIEW_SIZE']

        try:
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            loader = GdkPixbuf.PixbufLoader()
            loader.write(mem)
            loader.close()
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            if loader.get_format().get_name() == 'gif':
                pixbuf = loader.get_animation()
            else:
                pixbuf = loader.get_pixbuf()
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        except GLib.GError as error:
            log.info('Failed to load image using Gdk.Pixbuf')
            log.debug(error)

            if not PILLOW_AVAILABLE:
                log.info('Pillow not available')
                return
            # Try Pillow
            image = Image.open(BytesIO(mem)).convert("RGBA")
            array = GLib.Bytes.new(image.tobytes())
            width, height = image.size
            pixbuf = GdkPixbuf.Pixbuf.new_from_bytes(
                array, GdkPixbuf.Colorspace.RGB, True,
                8, width, height, width * 4)

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        try:
            self._create_path(os.path.dirname(thumbpath))
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            thumbnail = pixbuf
            if isinstance(pixbuf, GdkPixbuf.PixbufAnimation):
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                if size < pixbuf.get_width() or size < pixbuf.get_height():
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                    resize_gif(mem, thumbpath, (size, size))
                    thumbnail = self._load_thumbnail(thumbpath)
                else:
                    self._write_file(thumbpath, mem)
            else:
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                width, height = self._get_thumbnail_size(pixbuf, size)
                thumbnail = pixbuf.scale_simple(
                    width, height, GdkPixbuf.InterpType.BILINEAR)
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                thumbnail.savev(thumbpath, 'png', [], [])
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        except Exception as error:
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            dialogs.ErrorDialog(
                _('Could not save file'),
                _('Exception raised while saving thumbnail '
                  'for image file (see error log for more '
                  'information)'),
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                transient_for=app.app.get_active_window())
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            log.exception(error)
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            return
        return thumbnail
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    @staticmethod
    def _get_thumbnail_size(pixbuf, size):
        # Calculates the new thumbnail size while preserving the aspect ratio
        image_width = pixbuf.get_width()
        image_height = pixbuf.get_height()

        if image_width > image_height:
            if image_width > size:
                image_height = int(size / float(image_width) * image_height)
                image_width = int(size)
        else:
            if image_height > size:
                image_width = int(size / float(image_height) * image_width)
                image_height = int(size)

        return image_width, image_height

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    @staticmethod
    def _load_thumbnail(thumbpath):
        ext = os.path.splitext(thumbpath)[1]
        if ext == '.gif':
            return GdkPixbuf.PixbufAnimation.new_from_file(thumbpath)
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        return GdkPixbuf.Pixbuf.new_from_file(thumbpath)
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    @staticmethod
    def _write_file(path, data):
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        log.info("Writing '%s' of size %d...", path, len(data))
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        try:
            with open(path, "wb") as output_file:
                output_file.write(data)
                output_file.closed
        except Exception as e:
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            log.error("Failed to write file '%s'!", path)
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            raise

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    def _get_at_end(self):
        try:
            # Gajim 1.0.0
            return self.textview.at_the_end()
        except AttributeError:
            # Gajim 1.0.1
            return self.textview.autoscroll

    def _scroll_to_end(self):
        try:
            # Gajim 1.0.0
            self.textview.scroll_to_end_iter()
        except AttributeError:
            # Gajim 1.0.1
            self.textview.scroll_to_end()

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    def _update_img(self, pixbuf, url, repl_start, repl_end,
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                    filepath, encrypted):
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        if pixbuf is None:
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            # If image could not be downloaded, URL is already displayed
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            log.error('Could not download image for URL: %s', url)
            return

        urlparts = urlparse(url)
        filename = os.path.basename(urlparts.path)
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        if os.path.basename(filepath).startswith('location_'):
            filename = os.path.basename(filepath)

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        event_box = Gtk.EventBox()
        event_box.connect('button-press-event', self.on_button_press_event,
                          filepath, filename, url, encrypted)
        event_box.connect('enter-notify-event', self.on_enter_event)
        event_box.connect('leave-notify-event', self.on_leave_event)

        def add_to_textview():
            try:
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                at_end = self._get_at_end()
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                buffer_ = repl_start.get_buffer()
                iter_ = buffer_.get_iter_at_mark(repl_start)
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                buffer_.insert(iter_, "\n")
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                anchor = buffer_.create_child_anchor(iter_)
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                anchor.plaintext = url
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                if isinstance(pixbuf, GdkPixbuf.PixbufAnimation):
                    image = Gtk.Image.new_from_animation(pixbuf)
                else:
                    image = Gtk.Image.new_from_pixbuf(pixbuf)
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                css = '''#Preview {
                box-shadow: 0px 0px 3px 0px alpha(@theme_text_color, 0.2);
                margin: 5px 10px 5px 10px; }'''
                gtkgui_helpers.add_css_to_widget(image, css)
                image.set_name('Preview')

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                event_box.set_tooltip_text(url)
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                event_box.add(image)
                event_box.show_all()
                self.textview.tv.add_child_at_anchor(event_box, anchor)
                buffer_.delete(iter_,
                               buffer_.get_iter_at_mark(repl_end))

                if at_end:
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                    self._scroll_to_end()
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            except Exception as ex:
                log.exception("Exception while loading %s: %s", url, ex)
            return False
        # add to mainloop --> make call threadsafe
        GLib.idle_add(add_to_textview)
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    def _check_mime_size(self, tuple_arg,
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                         url, weburl, repl_start, repl_end, filepaths,
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                         key, iv, encrypted):
        file_mime, file_size = tuple_arg
        # Check if mime type is acceptable
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        if (file_mime == '' and file_size == 0) or file_mime is None:
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            log.info("Failed to load HEAD Request for URL: '%s'"
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                     "(see debug log for more info)", url)
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            # URL is already displayed
            return
        if file_mime.lower() not in ACCEPTED_MIME_TYPES:
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            log.info("Not accepted mime type '%s' for URL: '%s'",
                     file_mime.lower(), url)
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            # URL is already displayed
            return
        # Check if file size is acceptable
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        max_size = int(self.plugin.config['MAX_FILE_SIZE'])
        if file_size > max_size or file_size == 0:
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            log.info("File size (%s) too big or unknown (zero) for URL: '%s'",
                     file_size, url)
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            # URL is already displayed
            return

        attributes = {'src': url,
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                      'verify': self.plugin.config['VERIFY'],
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                      'max_size': max_size,
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                      'filepaths': filepaths,
                      'key': key,
                      'iv': iv}

        app.thread_interface(
            self._download_image, [self.textview.account,
                                   attributes, encrypted],
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            self._update_img, [weburl, repl_start, repl_end,
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                               filepaths[0], encrypted])

    def _download_image(self, account, attributes, encrypted):
        filepath = attributes['filepaths'][0]
        thumbpath = attributes['filepaths'][1]
        key = attributes['key']
        iv = attributes['iv']
        mem, alt = get_http_file(account, attributes)

        # Decrypt file if necessary
        if encrypted:
            mem = self._aes_decrypt_fast(key, iv, mem)

        try:
            # Write file to harddisk
            self._write_file(filepath, mem)
        except Exception as e:
            dialogs.ErrorDialog(
                _('Could not save file'),
                _('Exception raised while saving image file'
                  ' (see error log for more information)'),
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                transient_for=app.app.get_active_window())
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            log.error(str(e))

        # Create thumbnail, write it to harddisk and return it
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        return self._save_thumbnail(thumbpath, mem)
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    def _create_path(self, folder):
        if os.path.exists(folder):
            return
        log.debug("creating folder '%s'" % folder)
        os.mkdir(folder, 0o700)

    def _aes_decrypt_fast(self, key, iv, payload):
        # Use AES128 GCM with the given key and iv to decrypt the payload.
        if os.name == 'nt':
            be = backend
        else:
            be = default_backend()
        data = payload[:-16]
        tag = payload[-16:]
        decryptor = Cipher(
            algorithms.AES(key),
            GCM(iv, tag=tag),
            backend=be).decryptor()
        return decryptor.update(data) + decryptor.finalize()

    def make_rightclick_menu(self, event, data):
        xml = Gtk.Builder()
        xml.set_translation_domain('gajim_plugins')
        xml.add_from_file(self.plugin.local_file_path('context_menu.ui'))
        menu = xml.get_object('context_menu')

        open_menuitem = xml.get_object('open_menuitem')
        save_as_menuitem = xml.get_object('save_as_menuitem')
        copy_link_location_menuitem = \
            xml.get_object('copy_link_location_menuitem')
        open_link_in_browser_menuitem = \
            xml.get_object('open_link_in_browser_menuitem')
        open_file_in_browser_menuitem = \
            xml.get_object('open_file_in_browser_menuitem')
        extras_separator = \
            xml.get_object('extras_separator')
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        if data["encrypted"]:
            open_link_in_browser_menuitem.hide()
        if app.config.get('autodetect_browser_mailer') \
                or app.config.get('custombrowser') == '':
            extras_separator.hide()
            open_file_in_browser_menuitem.hide()

        id_ = open_menuitem.connect(
            'activate', self.on_open_menuitem_activate, data)
        self.handlers[id_] = open_menuitem
        id_ = save_as_menuitem.connect(
            'activate', self.on_save_as_menuitem_activate, data)
        self.handlers[id_] = save_as_menuitem
        id_ = copy_link_location_menuitem.connect(
            'activate', self.on_copy_link_location_menuitem_activate, data)
        self.handlers[id_] = copy_link_location_menuitem
        id_ = open_link_in_browser_menuitem.connect(
            'activate', self.on_open_link_in_browser_menuitem_activate, data)
        self.handlers[id_] = open_link_in_browser_menuitem
        id_ = open_file_in_browser_menuitem.connect(
            'activate', self.on_open_file_in_browser_menuitem_activate, data)
        self.handlers[id_] = open_file_in_browser_menuitem

        return menu

    def on_open_menuitem_activate(self, menu, data):
        filepath = data["filepath"]
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        original_filename = data["original_filename"]
        url = data["url"]
        if original_filename.startswith('location_'):
            helpers.launch_browser_mailer('url', url)
            return
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        helpers.launch_file_manager(filepath)

    def on_save_as_menuitem_activate(self, menu, data):
        filepath = data["filepath"]
        original_filename = data["original_filename"]
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        def on_continue(response, target_path):
            if response < 0:
                return
            shutil.copy(filepath, target_path)
            dialog.destroy()

        def on_ok(widget):
            target_path = dialog.get_filename()
            if os.path.exists(target_path):
                # check if we have write permissions
                if not os.access(target_path, os.W_OK):
                    file_name = os.path.basename(target_path)
                    dialogs.ErrorDialog(
                        _('Cannot overwrite existing file "%s"') % file_name,
                        _('A file with this name already exists and you do '
                          'not have permission to overwrite it.'))
                    return
                dialog2 = dialogs.FTOverwriteConfirmationDialog(
                    _('This file already exists'),
                    _('What do you want to do?'),
                    propose_resume=False,
                    on_response=(on_continue, target_path),
                    transient_for=dialog)
                dialog2.set_destroy_with_parent(True)
            else:
                dirname = os.path.dirname(target_path)
                if not os.access(dirname, os.W_OK):
                    dialogs.ErrorDialog(
                        _('Directory "%s" is not writable') % dirname,
                        _('You do not have permission to '
                          'create files in this directory.'))
                    return
                on_continue(0, target_path)

        def on_cancel(widget):
            dialog.destroy()

        dialog = dialogs.FileChooserDialog(
            title_text=_('Save Image as...'),
            action=Gtk.FileChooserAction.SAVE,
            buttons=(Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
                     Gtk.STOCK_SAVE, Gtk.ResponseType.OK),
            default_response=Gtk.ResponseType.OK,
            current_folder=app.config.get('last_save_dir'),
            on_response_ok=on_ok,
            on_response_cancel=on_cancel)

        dialog.set_current_name(original_filename)
        dialog.connect('delete-event', lambda widget, event:
                       on_cancel(widget))

    def on_copy_link_location_menuitem_activate(self, menu, data):
        url = data["url"]
        clipboard = Gtk.Clipboard.get(Gdk.SELECTION_CLIPBOARD)
        clipboard.set_text(url, -1)
        clipboard.store()

    def on_open_link_in_browser_menuitem_activate(self, menu, data):
        url = data["url"]
        if data["encrypted"]:
            dialogs.ErrorDialog(
                _('Encrypted file'),
                _('You cannot open encrypted files in your '
                  'browser directly. Try "Open Downloaded File '
                  'in Browser" instead.'),
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                transient_for=app.app.get_active_window())
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        else:
            helpers.launch_browser_mailer('url', url)
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    def on_open_file_in_browser_menuitem_activate(self, menu, data):
        if os.name == "nt":
            filepath = "file://" + os.path.abspath(data["filepath"])
        else:
            filepath = "file://" + data["filepath"]
        if app.config.get('autodetect_browser_mailer') \
                or app.config.get('custombrowser') == '':
            dialogs.ErrorDialog(
                _('Cannot open downloaded file in browser'),
                _('You have to set a custom browser executable '
                  'in your gajim settings for this to work.'),
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                transient_for=app.app.get_active_window())
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            return
        command = app.config.get('custombrowser')
        command = helpers.build_command(command, filepath)
        try:
            helpers.exec_command(command)
        except Exception:
            pass

    # Change mouse pointer to HAND2 when
    # mouse enter the eventbox with the image
    def on_enter_event(self, eb, event):
        self.textview.tv.get_window(
            Gtk.TextWindowType.TEXT).set_cursor(Gdk.Cursor(Gdk.CursorType.HAND2))

    # Change mouse pointer to default when mouse leaves the eventbox
    def on_leave_event(self, eb, event):
        self.textview.tv.get_window(
            Gtk.TextWindowType.TEXT).set_cursor(Gdk.Cursor(Gdk.CursorType.XTERM))

    def on_button_press_event(self, eb, event, filepath,
                              original_filename, url, encrypted):
        data = {"filepath": filepath,
                "original_filename": original_filename,
                "url": url,
                "encrypted": encrypted}
        # left click
        if event.type == Gdk.EventType.BUTTON_PRESS and event.button == 1:
            method = getattr(self, "on_"
                             + self.plugin.config['LEFTCLICK_ACTION']
                             + "_activate")
            method(event, data)
        # right klick
        elif event.type == Gdk.EventType.BUTTON_PRESS and event.button == 3:
            menu = self.make_rightclick_menu(event, data)
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            # menu.attach_to_widget(self.tv, None)
            # menu.popup(None, None, None, event.button, event.time)
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            menu.popup_at_pointer(event)

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    def disconnect_from_chat_control(self):
        pass