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/* Copyright (C) 2024 Gaurav Ujjwal. All Rights Reserved.
*
* This 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 software 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 software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include <X11/Xatom.h>
#include <rfb/Configuration.h>
#include <rfb/LogWriter.h>
#include <rfb/util.h>
#include <x0vncserver/XSelection.h>
rfb::BoolParameter setPrimary("SetPrimary",
"Set the PRIMARY as well as the CLIPBOARD selection",
true);
rfb::BoolParameter sendPrimary("SendPrimary",
"Send the PRIMARY as well as the CLIPBOARD selection",
true);
static rfb::LogWriter vlog("XSelection");
XSelection::XSelection(Display* dpy_, XSelectionHandler* handler_)
: TXWindow(dpy_, 1, 1, nullptr), handler(handler_), announcedSelection(None)
{
probeProperty = XInternAtom(dpy, "TigerVNC_ProbeProperty", False);
transferProperty = XInternAtom(dpy, "TigerVNC_TransferProperty", False);
timestampProperty = XInternAtom(dpy, "TigerVNC_TimestampProperty", False);
setName("TigerVNC Clipboard (x0vncserver)");
addEventMask(PropertyChangeMask); // Required for PropertyNotify events
}
static Bool PropertyEventMatcher(Display* /* dpy */, XEvent* ev, XPointer prop)
{
if (ev->type == PropertyNotify && ev->xproperty.atom == *((Atom*)prop))
return True;
else
return False;
}
Time XSelection::getXServerTime()
{
XEvent ev;
uint8_t data = 0;
// Trigger a PropertyNotify event to extract server time
XChangeProperty(dpy, win(), timestampProperty, XA_STRING, 8, PropModeReplace,
&data, sizeof(data));
XIfEvent(dpy, &ev, &PropertyEventMatcher, (XPointer)×tampProperty);
return ev.xproperty.time;
}
// Takes ownership of selections, backed by given data.
void XSelection::handleClientClipboardData(const char* data)
{
vlog.debug("Received client clipboard data, taking selection ownership");
Time time = getXServerTime();
ownSelection(xaCLIPBOARD, time);
if (!selectionOwner(xaCLIPBOARD))
vlog.error("Unable to own CLIPBOARD selection");
if (setPrimary) {
ownSelection(XA_PRIMARY, time);
if (!selectionOwner(XA_PRIMARY))
vlog.error("Unable to own PRIMARY selection");
}
if (selectionOwner(xaCLIPBOARD) || selectionOwner(XA_PRIMARY))
clientData = data;
}
// We own the selection and another X app has asked for data
bool XSelection::selectionRequest(Window requestor, Atom selection, Atom target,
Atom property)
{
if (clientData.empty() || requestor == win() || !selectionOwner(selection))
return false;
if (target == XA_STRING) {
std::string latin1 = rfb::utf8ToLatin1(clientData.data(), clientData.length());
XChangeProperty(dpy, requestor, property, XA_STRING, 8, PropModeReplace,
(unsigned char*)latin1.data(), latin1.length());
return true;
}
if (target == xaUTF8_STRING) {
XChangeProperty(dpy, requestor, property, xaUTF8_STRING, 8, PropModeReplace,
(unsigned char*)clientData.data(), clientData.length());
return true;
}
return false;
}
// Selection-owner change implies a change in selection data.
void XSelection::handleSelectionOwnerChange(Window owner, Atom selection, Time time)
{
if (selection != XA_PRIMARY && selection != xaCLIPBOARD)
return;
if (selection == XA_PRIMARY && !sendPrimary)
return;
if (selection == announcedSelection)
announceSelection(None);
if (owner == None || owner == win())
return;
if (!selectionOwner(XA_PRIMARY) && !selectionOwner(xaCLIPBOARD))
clientData = "";
XConvertSelection(dpy, selection, xaTARGETS, probeProperty, win(), time);
}
void XSelection::announceSelection(Atom selection)
{
announcedSelection = selection;
handler->handleXSelectionAnnounce(selection != None);
}
void XSelection::requestSelectionData()
{
if (announcedSelection != None)
XConvertSelection(dpy, announcedSelection, xaTARGETS, transferProperty, win(),
CurrentTime);
}
// Some information about selection is received from current owner
void XSelection::selectionNotify(XSelectionEvent* ev, Atom type, int format,
int nitems, void* data)
{
if (!ev || !data || type == None)
return;
if (ev->target == xaTARGETS) {
if (format != 32 || type != XA_ATOM)
return;
Atom* targets = (Atom*)data;
bool utf8Supported = false;
bool stringSupported = false;
for (int i = 0; i < nitems; i++) {
if (targets[i] == xaUTF8_STRING)
utf8Supported = true;
else if (targets[i] == XA_STRING)
stringSupported = true;
}
if (ev->property == probeProperty) {
// Only probing for now, will issue real request when client asks for data
if (stringSupported || utf8Supported)
announceSelection(ev->selection);
return;
}
// Prefer UTF-8 if available
if (utf8Supported)
XConvertSelection(dpy, ev->selection, xaUTF8_STRING, transferProperty, win(),
ev->time);
else if (stringSupported)
XConvertSelection(dpy, ev->selection, XA_STRING, transferProperty, win(),
ev->time);
} else if (ev->target == xaUTF8_STRING || ev->target == XA_STRING) {
if (type == xaINCR) {
// Incremental transfer is not supported
vlog.debug("Selected data is too big!");
return;
}
if (format != 8)
return;
if (type == xaUTF8_STRING) {
std::string result = rfb::convertLF((char*)data, nitems);
handler->handleXSelectionData(result.c_str());
} else if (type == XA_STRING) {
std::string result = rfb::convertLF((char*)data, nitems);
result = rfb::latin1ToUTF8(result.data(), result.length());
handler->handleXSelectionData(result.c_str());
}
}
}
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