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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/host/clipboard.h"
#import <Cocoa/Cocoa.h>
#include <stdint.h>
#include <memory>
#include <utility>
#include "base/callback_list.h"
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/mac/pasteboard_changed_observation.h"
#include "base/memory/ptr_util.h"
#include "base/strings/string_util.h"
#include "base/strings/sys_string_conversions.h"
#include "remoting/base/constants.h"
#include "remoting/base/util.h"
#include "remoting/proto/event.pb.h"
#include "remoting/protocol/clipboard_stub.h"
namespace remoting {
class ClipboardMac : public Clipboard {
public:
ClipboardMac();
ClipboardMac(const ClipboardMac&) = delete;
ClipboardMac& operator=(const ClipboardMac&) = delete;
~ClipboardMac() override;
void Start(
std::unique_ptr<protocol::ClipboardStub> client_clipboard) override;
void InjectClipboardEvent(const protocol::ClipboardEvent& event) override;
private:
void ClipboardChanged();
std::unique_ptr<protocol::ClipboardStub> client_clipboard_;
base::CallbackListSubscription clipboard_change_subscription_;
NSInteger current_change_count_ = 0;
};
ClipboardMac::ClipboardMac() = default;
ClipboardMac::~ClipboardMac() = default;
void ClipboardMac::Start(
std::unique_ptr<protocol::ClipboardStub> client_clipboard) {
client_clipboard_ = std::move(client_clipboard);
current_change_count_ = NSPasteboard.generalPasteboard.changeCount;
// Unretained is safe because the subscription's lifetime is scoped to the
// lifetime of this object.
clipboard_change_subscription_ =
base::RegisterPasteboardChangedCallback(base::BindRepeating(
&ClipboardMac::ClipboardChanged, base::Unretained(this)));
}
void ClipboardMac::InjectClipboardEvent(const protocol::ClipboardEvent& event) {
// Currently we only handle UTF-8 text.
if (event.mime_type().compare(kMimeTypeTextUtf8) != 0) {
return;
}
if (!base::IsStringUTF8AllowingNoncharacters(event.data())) {
LOG(ERROR) << "ClipboardEvent data is not UTF-8 encoded.";
return;
}
// Write text to clipboard.
NSString* text = base::SysUTF8ToNSString(event.data());
NSPasteboard* pasteboard = NSPasteboard.generalPasteboard;
[pasteboard clearContents];
[pasteboard writeObjects:@[ text ]];
// Update local change-count to prevent this change from being picked up by
// ClipboardChanged().
current_change_count_ = NSPasteboard.generalPasteboard.changeCount;
}
void ClipboardMac::ClipboardChanged() {
NSPasteboard* pasteboard = NSPasteboard.generalPasteboard;
NSInteger change_count = pasteboard.changeCount;
if (change_count == current_change_count_) {
return;
}
NSArray* objects = [pasteboard readObjectsForClasses:@[ [NSString class] ]
options:nil];
if (!objects.count) {
return;
}
protocol::ClipboardEvent event;
event.set_mime_type(kMimeTypeTextUtf8);
event.set_data(base::SysNSStringToUTF8(objects.lastObject));
client_clipboard_->InjectClipboardEvent(event);
}
std::unique_ptr<Clipboard> Clipboard::Create() {
return base::WrapUnique(new ClipboardMac());
}
} // namespace remoting
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