--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser_side/file_tools.py	Sun Feb 23 17:01:03 2014 +0100
@@ -0,0 +1,61 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+# Libervia: a Salut à Toi frontend
+# Copyright (C) 2011, 2012, 2013, 2014 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/>.
+
+from pyjamas.ui.FileUpload import FileUpload
+from pyjamas import Window
+from pyjamas import DOM
+
+
+class FilterFileUpload(FileUpload):
+
+    def __init__(self, name, max_size, types=None):
+        """
+        @param name: the input element name
+        @param max_size: maximum file size in MB
+        @param types: allowed types as a list of couples (x, y, z):
+        - x: MIME content type e.g. "audio/ogg"
+        - y: file extension e.g. "*.ogg"
+        - z: description for the user e.g. "Ogg Vorbis Audio"
+        If types is None, all file format are accepted
+        """
+        FileUpload.__init__(self)
+        self.setName(name)
+        while DOM.getElementById(name):
+            name = "%s_" % name
+        self.setID(name)
+        self._id = name
+        self.max_size = max_size
+        self.types = types
+
+    def getFileInfo(self):
+        from __pyjamas__ import JS
+        JS("var file = top.document.getElementById(this._id).files[0]; return [file.size, file.type]")
+
+    def check(self):
+        if self.getFilename() == "":
+            return False
+        (size, filetype) = self.getFileInfo()
+        if self.types and filetype not in [x for (x, y, z) in self.types]:
+            types = ["- %s (%s)" % (z, y) for (x, y, z) in self.types]
+            Window.alert('This file type is not accepted.\nAccepted file types are:\n\n%s' % "\n".join(types))
+            return False
+        if size > self.max_size * pow(2, 20):
+            Window.alert('This file is too big!\nMaximum file size: %d MB.' % self.max_size)
+            return False
+        return True