[gnome-remote-desktop] Add clipboard class for VNC

[Jonas Ådahl <jadahl src gnome org>]

commit 870945ea9931b999e900de8d2e99398f2249af8f
Author: Pascal Nowack <Pascal Nowack gmx de>
Date:   Wed Aug 12 01:20:49 2020 +0200

    Add clipboard class for VNC
    
    Add the implementation of grd-clipboard-vnc, a class that is derived
    from grd-clipboard, which implements the VNC specific clipboard parts.
    
    In contrary to the RDP clipboard, VNC does not handle mime-types other
    than plain text.
    In addition to that, the content is directly transferred to the other
    peer as soon as the clipboard changes.

 src/grd-clipboard-vnc.c | 200 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/grd-clipboard-vnc.h |  39 ++++++++++
 src/grd-types.h         |   1 +
 src/meson.build         |   2 +
 4 files changed, 242 insertions(+)
---
diff --git a/src/grd-clipboard-vnc.c b/src/grd-clipboard-vnc.c
new file mode 100644
index 0000000..a5400a3
--- /dev/null
+++ b/src/grd-clipboard-vnc.c
@@ -0,0 +1,200 @@
+/*
+ * Copyright (C) 2020 Pascal Nowack
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#include "config.h"
+
+#include "grd-clipboard-vnc.h"
+
+#include "grd-session-vnc.h"
+
+struct _GrdClipboardVnc
+{
+  GrdClipboard parent;
+
+  GrdSessionVnc *session_vnc;
+
+  char *clipboard_utf8_string;
+};
+
+G_DEFINE_TYPE (GrdClipboardVnc, grd_clipboard_vnc, GRD_TYPE_CLIPBOARD);
+
+static void
+update_vnc_clipboard (GrdClipboardVnc *clipboard_vnc,
+                      GrdMimeType      text_mime_type)
+{
+  GrdClipboard *clipboard = GRD_CLIPBOARD (clipboard_vnc);
+  g_autoptr (GError) error = NULL;
+  uint8_t *src_data;
+  uint32_t src_size;
+  char *dst_data;
+
+  src_data = grd_clipboard_request_server_content_for_mime_type (clipboard,
+                                                                 text_mime_type,
+                                                                 &src_size);
+  if (!src_data)
+    return;
+
+  dst_data = g_convert ((char *) src_data, src_size,
+                        "iso8859-1", "utf-8",
+                        NULL, NULL, &error);
+  if (!dst_data)
+    {
+      g_warning ("[VNC.Clipboard] Failed to convert clipboard content: %s",
+                 error->message);
+      return;
+    }
+
+  grd_session_vnc_set_client_clipboard_text (clipboard_vnc->session_vnc,
+                                             dst_data, strlen (dst_data));
+}
+
+static void
+grd_clipboard_vnc_update_client_mime_type_list (GrdClipboard *clipboard,
+                                                GList        *mime_type_list)
+{
+  GrdClipboardVnc *clipboard_vnc = GRD_CLIPBOARD_VNC (clipboard);
+  gboolean found_utf8_string = FALSE;
+  GrdMimeType mime_type;
+  GList *l;
+
+  for (l = mime_type_list; l && !found_utf8_string; l = l->next)
+    {
+      mime_type = GPOINTER_TO_INT (l->data);
+      switch (mime_type)
+        {
+        case GRD_MIME_TYPE_TEXT_PLAIN:
+          break;
+        case GRD_MIME_TYPE_TEXT_PLAIN_UTF8:
+        case GRD_MIME_TYPE_TEXT_UTF8_STRING:
+          found_utf8_string = TRUE;
+          break;
+        case GRD_MIME_TYPE_TEXT_HTML:
+        case GRD_MIME_TYPE_IMAGE_BMP:
+        case GRD_MIME_TYPE_IMAGE_TIFF:
+        case GRD_MIME_TYPE_IMAGE_GIF:
+        case GRD_MIME_TYPE_IMAGE_JPEG:
+        case GRD_MIME_TYPE_IMAGE_PNG:
+        case GRD_MIME_TYPE_TEXT_URILIST:
+        case GRD_MIME_TYPE_XS_GNOME_COPIED_FILES:
+          break;
+        default:
+          g_assert_not_reached ();
+        }
+    }
+
+  if (found_utf8_string)
+    {
+      g_clear_pointer (&clipboard_vnc->clipboard_utf8_string, g_free);
+
+      update_vnc_clipboard (clipboard_vnc, mime_type);
+    }
+
+  g_list_free (mime_type_list);
+}
+
+static uint8_t *
+grd_clipboard_vnc_request_client_content_for_mime_type (GrdClipboard     *clipboard,
+                                                        GrdMimeTypeTable *mime_type_table,
+                                                        uint32_t         *size)
+{
+  GrdClipboardVnc *clipboard_vnc = GRD_CLIPBOARD_VNC (clipboard);
+
+  *size = strlen (clipboard_vnc->clipboard_utf8_string);
+
+  return g_memdup2 (clipboard_vnc->clipboard_utf8_string, *size);
+}
+
+void
+grd_clipboard_vnc_maybe_enable_clipboard (GrdClipboardVnc *clipboard_vnc)
+{
+  grd_clipboard_maybe_enable_clipboard (GRD_CLIPBOARD (clipboard_vnc));
+}
+
+void
+grd_clipboard_vnc_set_clipboard_text (GrdClipboardVnc *clipboard_vnc,
+                                      char            *text,
+                                      int              text_length)
+{
+  GrdClipboard *clipboard = GRD_CLIPBOARD (clipboard_vnc);
+  g_autoptr (GError) error = NULL;
+  GrdMimeTypeTable *mime_type_table;
+  GList *mime_type_tables = NULL;
+
+  g_clear_pointer (&clipboard_vnc->clipboard_utf8_string, g_free);
+
+  clipboard_vnc->clipboard_utf8_string = g_convert (text, text_length,
+                                                    "utf-8", "iso8859-1",
+                                                    NULL, NULL, &error);
+  if (!clipboard_vnc->clipboard_utf8_string)
+    {
+      g_warning ("[VNC.Clipboard] Failed to convert clipboard content: %s",
+                 error->message);
+      return;
+    }
+
+  mime_type_table = g_malloc0 (sizeof (GrdMimeTypeTable));
+  mime_type_table->mime_type = GRD_MIME_TYPE_TEXT_UTF8_STRING;
+  mime_type_tables = g_list_append (mime_type_tables, mime_type_table);
+
+  grd_clipboard_update_server_mime_type_list (clipboard, mime_type_tables);
+}
+
+GrdClipboardVnc *
+grd_clipboard_vnc_new (GrdSessionVnc *session_vnc)
+{
+  GrdClipboardVnc *clipboard_vnc;
+
+  clipboard_vnc = g_object_new (GRD_TYPE_CLIPBOARD_VNC, NULL);
+  clipboard_vnc->session_vnc = session_vnc;
+
+  grd_clipboard_initialize (GRD_CLIPBOARD (clipboard_vnc),
+                            GRD_SESSION (session_vnc));
+
+  return clipboard_vnc;
+}
+
+static void
+grd_clipboard_vnc_dispose (GObject *object)
+{
+  GrdClipboardVnc *clipboard_vnc = GRD_CLIPBOARD_VNC (object);
+
+  grd_clipboard_disable_clipboard (GRD_CLIPBOARD (clipboard_vnc));
+  g_clear_pointer (&clipboard_vnc->clipboard_utf8_string, g_free);
+
+  G_OBJECT_CLASS (grd_clipboard_vnc_parent_class)->dispose (object);
+}
+
+static void
+grd_clipboard_vnc_init (GrdClipboardVnc *clipboard_vnc)
+{
+}
+
+static void
+grd_clipboard_vnc_class_init (GrdClipboardVncClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+  GrdClipboardClass *clipboard_class = GRD_CLIPBOARD_CLASS (klass);
+
+  object_class->dispose = grd_clipboard_vnc_dispose;
+
+  clipboard_class->update_client_mime_type_list =
+    grd_clipboard_vnc_update_client_mime_type_list;
+  clipboard_class->request_client_content_for_mime_type =
+    grd_clipboard_vnc_request_client_content_for_mime_type;
+}
diff --git a/src/grd-clipboard-vnc.h b/src/grd-clipboard-vnc.h
new file mode 100644
index 0000000..681e1c5
--- /dev/null
+++ b/src/grd-clipboard-vnc.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2020 Pascal Nowack
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#ifndef GRD_CLIPBOARD_VNC_H
+#define GRD_CLIPBOARD_VNC_H
+
+#include "grd-clipboard.h"
+
+#define GRD_TYPE_CLIPBOARD_VNC (grd_clipboard_vnc_get_type ())
+G_DECLARE_FINAL_TYPE (GrdClipboardVnc,
+                      grd_clipboard_vnc,
+                      GRD, CLIPBOARD_VNC,
+                      GrdClipboard);
+
+GrdClipboardVnc *grd_clipboard_vnc_new (GrdSessionVnc *session_vnc);
+
+void grd_clipboard_vnc_maybe_enable_clipboard (GrdClipboardVnc *clipboard_vnc);
+
+void grd_clipboard_vnc_set_clipboard_text (GrdClipboardVnc *clipboard_vnc,
+                                           char            *text,
+                                           int              text_length);
+
+#endif /* GRD_CLIPBOARD_VNC_H */
diff --git a/src/grd-types.h b/src/grd-types.h
index 73920ae..f54f114 100644
--- a/src/grd-types.h
+++ b/src/grd-types.h
@@ -26,6 +26,7 @@
 typedef struct _GrdContext GrdContext;
 typedef struct _GrdClipboard GrdClipboard;
 typedef struct _GrdClipboardRdp GrdClipboardRdp;
+typedef struct _GrdClipboardVnc GrdClipboardVnc;
 typedef struct _GrdRdpEventQueue GrdRdpEventQueue;
 typedef struct _GrdRdpSAMFile GrdRdpSAMFile;
 typedef struct _GrdRdpServer GrdRdpServer;
diff --git a/src/meson.build b/src/meson.build
index 0e97031..b2ce5e6 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -3,6 +3,8 @@ daemon_sources = files([
   'grd-clipboard.h',
   'grd-clipboard-rdp.c',
   'grd-clipboard-rdp.h',
+  'grd-clipboard-vnc.c',
+  'grd-clipboard-vnc.h',
   'grd-context.c',
   'grd-context.h',
   'grd-daemon.c',