check file permissions before saving avatar

catch FileChooser 'response' signal, instead
of dialog buttons 'clicked' signals (gtk+-2.10)

src/dialogs.py

@@ -837,27 +837,27 @@ class FileChooserDialog(gtk.FileChooserDialog):
 			self.set_current_folder(current_folder)
 		else:
 			self.set_current_folder(helpers.get_documents_path())
-
-		buttons = self.action_area.get_children()
-		possible_responses = {gtk.STOCK_OPEN: on_response_ok,
-			gtk.STOCK_SAVE: on_response_ok,
-			gtk.STOCK_CANCEL: on_response_cancel}
-		for b in buttons:
-			for response in possible_responses:
-				if b.get_label() == response:
-					if not possible_responses[response]:
-						b.connect('clicked', self.just_destroy)
-					elif isinstance(possible_responses[response], tuple):
-						if len(possible_responses[response]) == 1:
-							b.connect('clicked', possible_responses[response][0])
-						else:
-							b.connect('clicked', *possible_responses[response])
-					else:
-						b.connect('clicked', possible_responses[response])
-					break
-
+		self.response_ok, self.response_cancel = \
+			on_response_ok, on_response_cancel
+		# in gtk+-2.10 clicked signal on some of the buttons in a dialog
+		# is emitted twice, so we cannot rely on 'clicked' signal
+		self.connect('response', self.on_dialog_response)
 		self.show_all()
 
+	def on_dialog_response(self, dialog, response):
+		if response in (gtk.RESPONSE_CANCEL, gtk.RESPONSE_CLOSE):
+			if self.response_cancel:
+				if isinstance(self.response_cancel, tuple):
+					self.response_cancel[0](dialog, *self.response_cancel[1:])
+				else:
+					self.response_cancel(dialog)
+		elif response == gtk.RESPONSE_OK:
+			if self.response_ok:
+				if isinstance(self.response_ok, tuple):
+					self.response_ok[0](dialog, *self.response_ok[1:])
+				else:
+					self.response_ok(dialog)
+			
 	def just_destroy(self, widget):
 		self.destroy()
 

src/filetransfers_window.py

@@ -246,11 +246,16 @@ _('Connection with peer cannot be established.'))
 			gtk.RESPONSE_OK,
 			True, # select multiple true as we can select many files to send
 			gajim.config.get('last_send_dir'),
+			on_response_ok = on_ok,
+			on_response_cancel = lambda e:dialog.destroy()
 			)
 
-		btn = dialog.add_button(_('_Send'), gtk.RESPONSE_OK)
-		btn.set_use_stock(True) # FIXME: add send icon to this button (JUMP_TO)
-		btn.connect('clicked', on_ok)
+		btn = gtk.Button(_('_Send'))
+		btn.set_property('can-default', True)
+		# FIXME: add send icon to this button (JUMP_TO)
+		dialog.add_action_widget(btn, gtk.RESPONSE_OK)
+		dialog.set_default_response(gtk.RESPONSE_OK)
+		btn.show()
 
 	def send_file(self, account, contact, file_path):
 		''' start the real transfer(upload) of the file '''

src/gtkgui_helpers.py

@@ -680,6 +680,14 @@ default_name = ''):
 		file_path = dialog.get_filename()
 		file_path = decode_filechooser_file_paths((file_path,))[0]
 		if os.path.exists(file_path):
+			# check if we have write permissions
+			if not os.access(file_path, os.W_OK):
+				file_name = os.path.basename(file_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?'),
 				False)
@@ -688,6 +696,13 @@ default_name = ''):
 			response = dialog2.get_response()
 			if response < 0:
 				return
+		else:
+			dirname = os.path.dirname(file_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
 
 		# Get pixbuf
 		pixbuf = None
@@ -710,7 +725,7 @@ default_name = ''):
 		try:
 			pixbuf.save(file_path, type_)
 		except:
-			#XXX Check for permissions
+			if os.path.exists(file_path):
 				os.remove(file_path)
 			new_file_path = '.'.join(file_path.split('.')[:-1]) + '.jpeg'
 			dialog2 = dialogs.ConfirmationDialog(_('Extension not supported'),