--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libervia/desktop_kivy/core/platform_/base.py	Fri Jun 02 18:26:16 2023 +0200
@@ -0,0 +1,129 @@
+#!/usr/bin/env python3
+
+#Libervia Desktop-Kivy
+# Copyright (C) 2016-2021 Jérôme Poisson (goffi@goffi.org)
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import sys
+import webbrowser
+import subprocess
+import shutil
+from urllib import parse
+from kivy.config import Config as KivyConfig
+from libervia.backend.core.i18n import _
+from libervia.backend.core.log import getLogger
+from libervia.backend.core import exceptions
+from libervia.frontends.quick_frontend.quick_widgets import QuickWidget
+from libervia.desktop_kivy import G
+
+
+log = getLogger(__name__)
+
+
+class Platform:
+    """Base class to handle platform specific behaviours"""
+    # set to True to always show the send button in chat
+    send_button_visible = False
+
+    def init_platform(self):
+        # we don't want multi-touch emulation with mouse
+
+        # this option doesn't make sense on Android and cause troubles, so we only
+        # activate it for other platforms (cf. https://github.com/kivy/kivy/issues/6229)
+        KivyConfig.set('input', 'mouse', 'mouse,disable_multitouch')
+
+    def on_app_build(self, Wid):
+        pass
+
+    def on_host_init(self, host):
+        pass
+
+    def on_init_frontend_state(self):
+        pass
+
+    def do_post_init(self):
+        return True
+
+    def on_pause(self):
+        pass
+
+    def on_resume(self):
+        pass
+
+    def on_stop(self):
+        pass
+
+    def on_key_back_root(self):
+        """Back key is called while being on root widget"""
+        return True
+
+    def on_key_back_share(self, share_widget):
+        """Back key is called while being on share widget"""
+        share_widget.close()
+        return True
+
+    def _on_new_window(self):
+        """Launch a new instance of LiberviaDesktopKivy to have an extra window"""
+        subprocess.Popen(sys.argv)
+
+    def on_extra_menu_init(self, extra_menu):
+        extra_menu.add_item(_('new window'), self._on_new_window)
+
+    def update_params_extra(self, extra):
+        pass
+
+    def check_plugin_permissions(self, plug_info, callback, errback):
+        """Check that plugin permissions for this platform are granted"""
+        callback()
+
+    def _open(self, path):
+        """Open url or path with appropriate application if possible"""
+        try:
+            opener = self._opener
+        except AttributeError:
+            xdg_open_path = shutil.which("xdg-open")
+            if xdg_open_path is not None:
+                log.debug("xdg-open found, it will be used to open files")
+                opener = lambda path: subprocess.Popen([xdg_open_path, path])
+            else:
+                log.debug("files will be opened with webbrower.open")
+                opener = webbrowser.open
+            self._opener = opener
+
+        opener(path)
+
+
+    def open_url(self, url, wid=None):
+        """Open an URL in the way appropriate for the platform
+
+        @param url(str): URL to open
+        @param wid(LiberviaDesktopKivyWidget, None): widget requesting the opening
+            it may influence the way the URL is opened
+        """
+        parsed_url = parse.urlparse(url)
+        if parsed_url.scheme == "aesgcm" and wid is not None:
+            # aesgcm files need to be decrypted first
+            # so we download them before opening
+            quick_widget = G.host.get_ancestor_widget(wid, QuickWidget)
+            if quick_widget is None:
+                msg = f"Can't find ancestor QuickWidget of {wid}"
+                log.error(msg)
+                G.host.errback(exceptions.InternalError(msg))
+                return
+            G.host.download_url(
+                parsed_url, self.open_url, G.host.errback, profile=quick_widget.profile
+            )
+        else:
+            self._open(url)