LibGUI+WindowServer: Separate window manager IPC from regular IPC

With this patch the window manager related functionality is split out
onto a new endpoint pair named WindowManagerServer/Client.  This allows
window manager functionality to be potentially privilege separated in
the future.  To this end, a new client named WMConnectionClient
is used to maintain a window manager connection.  When a process
connects to the endpoint and greets the WindowServer as a window manager
(via Window::make_window_manager(int)), they're subscribed to the events
they requested via the WM event mask.

This patch also removes the hardcoding of the Taskbar WindowType to
receive WM events automatically.  However, being a window manager still
requires having an active window, at the moment.

1 files changed, 57 insertions, 0 deletions

diff --git a/Userland/Libraries/LibGUI/WindowManagerServerConnection.h b/Userland/Libraries/LibGUI/WindowManagerServerConnection.h
new file mode 100644
index 0000000000..3543c6f9bc
--- /dev/null
+++ b/Userland/Libraries/LibGUI/WindowManagerServerConnection.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2021, the SerenityOS developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <LibIPC/ServerConnection.h>
+#include <WindowServer/WindowManagerClientEndpoint.h>
+#include <WindowServer/WindowManagerServerEndpoint.h>
+
+namespace GUI {
+
+class WindowManagerServerConnection
+    : public IPC::ServerConnection<WindowManagerClientEndpoint, WindowManagerServerEndpoint>
+    , public WindowManagerClientEndpoint {
+    C_OBJECT(WindowManagerServerConnection)
+public:
+    WindowManagerServerConnection()
+        : IPC::ServerConnection<WindowManagerClientEndpoint, WindowManagerServerEndpoint>(*this, "/tmp/portal/wm")
+    {
+        handshake();
+    }
+
+    virtual void handshake() override;
+    static WindowManagerServerConnection& the();
+
+private:
+    virtual void handle(const Messages::WindowManagerClient::WindowRemoved&) override;
+    virtual void handle(const Messages::WindowManagerClient::WindowStateChanged&) override;
+    virtual void handle(const Messages::WindowManagerClient::WindowIconBitmapChanged&) override;
+    virtual void handle(const Messages::WindowManagerClient::WindowRectChanged&) override;
+    virtual void handle(const Messages::WindowManagerClient::AppletAreaSizeChanged&) override;
+};
+
+}