managesieve: allow script loading to be interrupted

Prevent use after free when an editor window is closed while loading

Uses string "Loading..." which is already translated

src/plugins/managesieve/sieve_editor.c

@@ -625,8 +625,6 @@ MENUITEM_ADDUI_MANAGER(ui_manager, "/Menu/Filter", "Revert", "Filter/Revert", GT
 	undo_set_change_state_func(undostruct, &sieve_editor_undo_state_changed,
 			page);
 
-	gtk_widget_show_all(window);
-
 	page->window = window;
 	page->ui_manager = ui_manager;
 	page->text = text;
@@ -661,6 +659,11 @@ void sieve_editor_present(SieveEditorPage *page)
 	gtk_window_present(GTK_WINDOW(page->window));
 }
 
+void sieve_editor_show(SieveEditorPage *page)
+{
+	gtk_widget_show_all(GTK_WIDGET(page->window));
+}
+
 static void sieve_editor_set_modified(SieveEditorPage *page,
 		gboolean modified)
 {
@@ -680,3 +683,49 @@ static void sieve_editor_set_modified(SieveEditorPage *page,
 		sieve_editor_set_status_icon(page, NULL);
 	}
 }
+
+static void got_data_loading(SieveSession *session, gboolean aborted,
+		gchar *contents, SieveEditorPage *page)
+{
+	if (aborted)
+		return;
+	if (contents == NULL) {
+		/* end of data */
+		sieve_editor_set_status(page, "");
+		return;
+	}
+	if (contents == (void *)-1) {
+		/* error */
+		if (page->first_line) {
+			/* no data. show error in manager window */
+			if (page->on_load_error)
+				page->on_load_error(session, page->on_load_error_data);
+		} else {
+			/* partial failure. show error in editor window */
+			sieve_editor_set_status(page, _("Unable to get script contents"));
+			sieve_editor_set_status_icon(page, GTK_STOCK_DIALOG_ERROR);
+		}
+		return;
+	}
+
+	if (page->first_line) {
+		page->first_line = FALSE;
+		sieve_editor_show(page);
+	} else {
+		sieve_editor_append_text(page, "\n", 1);
+	}
+	sieve_editor_append_text(page, contents, strlen(contents));
+}
+
+/* load the script for this editor */
+void sieve_editor_load(SieveEditorPage *page,
+		sieve_session_cb_fn on_load_error, gpointer load_error_data)
+{
+	page->first_line = TRUE;
+	page->on_load_error = on_load_error;
+	page->on_load_error_data = load_error_data;
+	sieve_editor_set_status(page, _("Loading..."));
+	sieve_editor_set_status_icon(page, NULL);
+	sieve_session_get_script(page->session, page->script_name,
+			(sieve_session_data_cb_fn)got_data_loading, page);
+}

src/plugins/managesieve/sieve_editor.h

@@ -38,12 +38,19 @@ struct SieveEditorPage
 	gboolean	first_line;
 	gboolean	modified;
 	gboolean	closing;
+
+	/* callback for failure to load the script */
+	sieve_session_cb_fn on_load_error;
+	gpointer on_load_error_data;
 };
 
 SieveEditorPage *sieve_editor_new(SieveSession *session, gchar *script_name);
 SieveEditorPage *sieve_editor_get(SieveSession *session, gchar *script_name);
+void sieve_editor_load(SieveEditorPage *page,
+		sieve_session_cb_fn on_load_error, gpointer load_error_data);
 void sieve_editor_append_text(SieveEditorPage *page, gchar *text, gint len);
 void sieve_editor_close(SieveEditorPage *page);
+void sieve_editor_show(SieveEditorPage *page);
 void sieve_editor_present(SieveEditorPage *page);
 
 #endif /* SIEVE_EDITOR_H */

src/plugins/managesieve/sieve_manager.c

@@ -59,13 +59,6 @@ typedef struct {
 	gchar *filter_name;
 } CommandDataName;
 
-typedef struct {
-	SieveManagerPage *page;
-	gchar *filter_name;
-	SieveEditorPage *editor_page;
-	gboolean first_line;
-} CommandDataGetScript;
-
 static void account_changed(GtkWidget *widget, SieveManagerPage *page);
 void sieve_manager_close(GtkWidget *widget, SieveManagerPage *page);
 static void filter_set_active(SieveManagerPage *page, gchar *filter_name);
@@ -157,46 +150,28 @@ static void filter_add(GtkWidget *widget, SieveManagerPage *page)
 	if (!filter_name || !filter_name[0])
 		return;
 
-	sieve_editor_new(session, filter_name);
+	sieve_editor_show(sieve_editor_new(session, filter_name));
 	/*
 	sieve_session_add_script(session, filter_name
 			(sieve_session_data_cb_fn)filter_added, (gpointer)page);
 			*/
 }
 
-static void filter_got_data(SieveSession *session, gboolean abort,
-		gchar *contents, CommandDataGetScript *cmd_data)
+static void filter_got_load_error(SieveSession *session, gpointer data)
 {
-	SieveManagerPage *page = cmd_data->page;
-	SieveEditorPage *editor;
+	SieveManagerPage *page = data;
 
-	if (abort || !contents) {
-		g_free(cmd_data->filter_name);
-		g_free(cmd_data);
-		return;
-	} else if (contents == (void *)-1) {
 	got_session_error(session, _("Unable to get script contents"), page);
-		return;
-	}
-
-	if (cmd_data->first_line) {
-		cmd_data->first_line = FALSE;
-		editor = sieve_editor_new(session, cmd_data->filter_name);
-		cmd_data->editor_page = editor;
-	} else {
-		editor = cmd_data->editor_page;
-		sieve_editor_append_text(editor, "\n", 1);
-	}
-	sieve_editor_append_text(editor, contents, strlen(contents));
 }
 
 static void filter_edit(GtkWidget *widget, SieveManagerPage *page)
 {
 	SieveEditorPage *editor;
-	CommandDataGetScript *cmd_data;
 	SieveSession *session = page->active_session;
+
 	if (!session)
 		return;
+
 	gchar *filter_name = filters_list_get_selected_filter(page->filters_list);
 	if (!filter_name)
 		return;
@@ -205,13 +180,9 @@ static void filter_edit(GtkWidget *widget, SieveManagerPage *page)
 	if (editor) {
 		sieve_editor_present(editor);
 	} else {
-		cmd_data = g_new0(CommandDataGetScript, 1);
-		cmd_data->first_line = TRUE;
-		cmd_data->filter_name = filter_name;
-		cmd_data->page = page;
-
-		sieve_session_get_script(session, filter_name,
-			(sieve_session_data_cb_fn)filter_got_data, cmd_data);
+		editor = sieve_editor_new(session, filter_name);
+		sieve_editor_load(editor,
+			(sieve_session_cb_fn)filter_got_load_error, page);
 	}
 }