--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libervia/desktop_kivy/plugins/plugin_transfer_file.py	Fri Jun 02 18:26:16 2023 +0200
@@ -0,0 +1,81 @@
+#!/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 threading
+import sys
+from functools import partial
+from libervia.backend.core import log as logging
+from libervia.backend.core.i18n import _
+from kivy.uix.boxlayout import BoxLayout
+from kivy import properties
+from kivy.clock import Clock
+from plyer import filechooser, storagepath
+
+log = logging.getLogger(__name__)
+
+
+PLUGIN_INFO = {
+    "name": _("file"),
+    "main": "FileTransmitter",
+    "description": _("transmit a local file"),
+    "icon_medium": "{media}/icons/muchoslava/png/fichier_50.png",
+}
+
+
+class FileChooserBox(BoxLayout):
+    callback = properties.ObjectProperty()
+    cancel_cb = properties.ObjectProperty()
+    default_path = properties.StringProperty()
+
+
+class FileTransmitter(BoxLayout):
+    callback = properties.ObjectProperty()
+    cancel_cb = properties.ObjectProperty()
+    native_filechooser = True
+    default_path = storagepath.get_home_dir()
+
+    def __init__(self, *args, **kwargs):
+        if sys.platform == 'android':
+            self.native_filechooser = False
+            self.default_path = storagepath.get_downloads_dir()
+
+        super(FileTransmitter, self).__init__(*args, **kwargs)
+
+        if self.native_filechooser:
+            thread = threading.Thread(target=self._native_file_chooser)
+            thread.start()
+        else:
+            self.add_widget(FileChooserBox(default_path = self.default_path,
+                                           callback=self.on_files,
+                                           cancel_cb=partial(self.cancel_cb, self)))
+
+    def _native_file_chooser(self, *args, **kwargs):
+        title=_("Please select a file to upload")
+        files = filechooser.open_file(title=title,
+                                      path=self.default_path,
+                                      multiple=False,
+                                      preview=True)
+        # we want to leave the thread when calling on_files, so we use Clock
+        Clock.schedule_once(lambda *args: self.on_files(files=files), 0)
+
+    def on_files(self, files):
+        if files:
+            self.callback(files[0])
+        else:
+            self.cancel_cb(self)