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remote-desktop/session: Implement SelectionRead()

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This makes it possible to retrieve the clipboard content from the
current selection clipboard source.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1552>
This commit is contained in:
Jonas Ådahl 2020-11-04 15:03:16 +01:00 committed by Marge Bot
parent a220506bf7
commit d7c8535ac6
1 changed files with 128 additions and 4 deletions
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132
src/backends/meta-remote-desktop-session.c
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@ -24,9 +24,14 @@
#include "backends/meta-remote-desktop-session.h"
#include <fcntl.h>
#include <gio/gunixfdlist.h>
#include <gio/gunixoutputstream.h>
#include <glib-unix.h>
#include <linux/input.h>
#include <xkbcommon/xkbcommon.h>
#include <stdlib.h>
#include <unistd.h>
#include <xkbcommon/xkbcommon.h>
#include "backends/meta-dbus-session-watcher.h"
#include "backends/meta-screen-cast-session.h"
@ -34,6 +39,7 @@
#include "backends/x11/meta-backend-x11.h"
#include "cogl/cogl.h"
#include "core/display-private.h"
#include "core/meta-selection-private.h"
#include "meta/meta-backend.h"
#include "meta-dbus-remote-desktop.h"
@ -49,6 +55,13 @@ typedef enum _MetaRemoteDesktopNotifyAxisFlags
META_REMOTE_DESKTOP_NOTIFY_AXIS_FLAGS_SOURCE_CONTINUOUS = 1 << 3,
} MetaRemoteDesktopNotifyAxisFlags;
typedef struct _SelectionReadData
{
MetaRemoteDesktopSession *session;
GOutputStream *stream;
GCancellable *cancellable;
} SelectionReadData;
struct _MetaRemoteDesktopSession
{
MetaDBusRemoteDesktopSessionSkeleton parent;
@ -71,6 +84,7 @@ struct _MetaRemoteDesktopSession
gboolean is_clipboard_enabled;
gulong owner_changed_handler_id;
SelectionReadData *read_data;
unsigned int transfer_serial;
};
@ -918,6 +932,17 @@ handle_enable_clipboard (MetaDBusRemoteDesktopSession *skeleton,
return TRUE;
}
static void
cancel_selection_read (MetaRemoteDesktopSession *session)
{
if (!session->read_data)
return;
g_cancellable_cancel (session->read_data->cancellable);
session->read_data->session = NULL;
session->read_data = NULL;
}
static gboolean
handle_disable_clipboard (MetaDBusRemoteDesktopSession *skeleton,
GDBusMethodInvocation *invocation)
@ -939,6 +964,7 @@ handle_disable_clipboard (MetaDBusRemoteDesktopSession *skeleton,
}
g_clear_signal_handler (&session->owner_changed_handler_id, selection);
cancel_selection_read (session);
meta_dbus_remote_desktop_session_complete_disable_clipboard (skeleton,
invocation);
@ -1037,13 +1063,52 @@ handle_selection_write_done (MetaDBusRemoteDesktopSession *skeleton,
return TRUE;
}
static void
transfer_cb (MetaSelection *selection,
GAsyncResult *res,
SelectionReadData *read_data)
{
g_autoptr (GError) error = NULL;
if (!meta_selection_transfer_finish (selection, res, &error))
{
g_warning ("Could not fetch selection data "
"for remote desktop session: %s",
error->message);
}
if (read_data->session)
{
meta_topic (META_DEBUG_REMOTE_DESKTOP, "Finished selection transfer for %s",
read_data->session->peer_name);
}
g_output_stream_close (read_data->stream, NULL, NULL);
g_clear_object (&read_data->stream);
g_clear_object (&read_data->cancellable);
if (read_data->session)
read_data->session->read_data = NULL;
g_free (read_data);
}
static gboolean
handle_selection_read (MetaDBusRemoteDesktopSession *skeleton,
GDBusMethodInvocation *invocation,
GUnixFDList *fd_list,
GUnixFDList *fd_list_in,
const char *mime_type)
{
MetaRemoteDesktopSession *session = META_REMOTE_DESKTOP_SESSION (skeleton);
MetaDisplay *display = meta_get_display ();
MetaSelection *selection = meta_display_get_selection (display);
MetaSelectionSource *source;
g_autoptr (GError) error = NULL;
int pipe_fds[2];
g_autoptr (GUnixFDList) fd_list = NULL;
int fd_idx;
GVariant *fd_variant;
SelectionReadData *read_data;
meta_topic (META_DEBUG_REMOTE_DESKTOP,
"Read selection for %s",
@ -1057,10 +1122,68 @@ handle_selection_read (MetaDBusRemoteDesktopSession *skeleton,
return TRUE;
}
source = meta_selection_get_current_owner (selection,
META_SELECTION_CLIPBOARD);
if (!source)
{
g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR,
G_DBUS_ERROR_FILE_NOT_FOUND,
"No selection owner available");
return TRUE;
}
if (session->read_data)
{
g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR,
G_DBUS_ERROR_LIMITS_EXCEEDED,
"Tried to read in parallel");
return TRUE;
}
if (!g_unix_open_pipe (pipe_fds, FD_CLOEXEC, &error))
{
g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR,
G_DBUS_ERROR_FAILED,
"Failed open pipe: %s",
error->message);
return TRUE;
}
if (!g_unix_set_fd_nonblocking (pipe_fds[0], TRUE, &error))
{
close (pipe_fds[0]);
close (pipe_fds[1]);
g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR,
G_DBUS_ERROR_FAILED,
"Failed to make pipe non-blocking: %s",
error->message);
return TRUE;
}
fd_list = g_unix_fd_list_new ();
fd_idx = g_unix_fd_list_append (fd_list, pipe_fds[0], NULL);
close (pipe_fds[0]);
fd_variant = g_variant_new_handle (fd_idx);
session->read_data = read_data = g_new0 (SelectionReadData, 1);
read_data->session = session;
read_data->stream = g_unix_output_stream_new (pipe_fds[1], TRUE);
read_data->cancellable = g_cancellable_new ();
meta_selection_transfer_async (selection,
META_SELECTION_CLIPBOARD,
mime_type,
-1,
read_data->stream,
read_data->cancellable,
(GAsyncReadyCallback) transfer_cb,
read_data);
meta_dbus_remote_desktop_session_complete_selection_read (skeleton,
invocation,
NULL,
NULL);
fd_list,
fd_variant);
return TRUE;
}
@ -1110,6 +1233,7 @@ meta_remote_desktop_session_finalize (GObject *object)
g_assert (!meta_remote_desktop_session_is_running (session));
g_clear_signal_handler (&session->owner_changed_handler_id, selection);
cancel_selection_read (session);
g_clear_object (&session->handle);
g_free (session->peer_name);