Ladybird: Construct a WebDriverConnection when instructed to do so

The WebDriver will pass the --webdriver-fd-passing-socket command line
option when it launches Ladybird. Forward this flag onto the WebContent
process, where it will create the WebDriverConnection for IPC.

Ladybird/BrowserWindow.cpp

@@ -21,7 +21,8 @@
 extern String s_serenity_resource_root;
 extern Browser::Settings* s_settings;
 
-BrowserWindow::BrowserWindow()
+BrowserWindow::BrowserWindow(int webdriver_fd_passing_socket)
+    : m_webdriver_fd_passing_socket(webdriver_fd_passing_socket)
 {
     m_tabs_container = new QTabWidget(this);
     m_tabs_container->setElideMode(Qt::TextElideMode::ElideRight);
@@ -282,7 +283,7 @@ void BrowserWindow::debug_request(String const& request, String const& argument)
 
 void BrowserWindow::new_tab()
 {
-    auto tab = make<Tab>(this);
+    auto tab = make<Tab>(this, m_webdriver_fd_passing_socket);
     auto tab_ptr = tab.ptr();
     m_tabs.append(std::move(tab));
 

Ladybird/BrowserWindow.h

@@ -22,7 +22,7 @@ class WebContentView;
 class BrowserWindow : public QMainWindow {
     Q_OBJECT
 public:
-    explicit BrowserWindow();
+    explicit BrowserWindow(int webdriver_fd_passing_socket);
 
     WebContentView& view() const { return m_current_tab->view(); }
 
@@ -48,4 +48,6 @@ private:
     Tab* m_current_tab { nullptr };
 
     Browser::CookieJar m_cookie_jar;
+
+    int m_webdriver_fd_passing_socket { -1 };
 };

Ladybird/Tab.cpp

@@ -20,7 +20,7 @@
 extern String s_serenity_resource_root;
 extern Browser::Settings* s_settings;
 
-Tab::Tab(BrowserWindow* window)
+Tab::Tab(BrowserWindow* window, int webdriver_fd_passing_socket)
     : QWidget(window)
     , m_window(window)
 {
@@ -28,7 +28,7 @@ Tab::Tab(BrowserWindow* window)
     m_layout->setSpacing(0);
     m_layout->setContentsMargins(0, 0, 0, 0);
 
-    m_view = new WebContentView;
+    m_view = new WebContentView(webdriver_fd_passing_socket);
     m_toolbar = new QToolBar(this);
     m_location_edit = new QLineEdit(this);
 
@@ -115,8 +115,13 @@ Tab::Tab(BrowserWindow* window)
     // FIXME: This is a hack to make the JS console usable in new windows.
     //        Something else should ensure that there's an initial about:blank document loaded in the view.
     //        We set m_is_history_navigation = true so that the initial about:blank doesn't get added to the history.
-    m_is_history_navigation = true;
-    m_view->load("about:blank"sv);
+    //
+    //        Note we *don't* do this if we are connected to a WebDriver, as the Set URL command may come in very
+    //        quickly, and become replaced by this load.
+    if (webdriver_fd_passing_socket == -1) {
+        m_is_history_navigation = true;
+        m_view->load("about:blank"sv);
+    }
 }
 
 void Tab::focus_location_editor()

Ladybird/Tab.h

@@ -22,7 +22,7 @@ class BrowserWindow;
 class Tab final : public QWidget {
     Q_OBJECT
 public:
-    explicit Tab(BrowserWindow* window);
+    Tab(BrowserWindow* window, int webdriver_fd_passing_socket);
 
     WebContentView& view() { return *m_view; }
 

Ladybird/WebContent/main.cpp

@@ -29,6 +29,7 @@
 #include <QSocketNotifier>
 #include <QTimer>
 #include <WebContent/ConnectionFromClient.h>
+#include <WebContent/WebDriverConnection.h>
 
 static ErrorOr<void> load_content_filters();
 
@@ -89,14 +90,21 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         dbgln("Failed to load content filters: {}", maybe_content_filter_error.error());
 
     int webcontent_fd_passing_socket { -1 };
+    int webdriver_fd_passing_socket { -1 };
 
     Core::ArgsParser args_parser;
     args_parser.add_option(webcontent_fd_passing_socket, "File descriptor of the passing socket for the WebContent connection", "webcontent-fd-passing-socket", 'c', "webcontent_fd_passing_socket");
+    args_parser.add_option(webdriver_fd_passing_socket, "File descriptor of the passing socket for the WebDriver connection", "webdriver-fd-passing-socket", 'd', "webdriver_fd_passing_socket");
     args_parser.parse(arguments);
 
     QSocketNotifier webcontent_notifier(QSocketNotifier::Type::Read);
     auto webcontent_client = TRY(create_connection_from_passed_socket<WebContent::ConnectionFromClient>(webcontent_fd_passing_socket, "WebContent"sv, webcontent_notifier));
 
+    QSocketNotifier webdriver_notifier(QSocketNotifier::Type::Read);
+    RefPtr<WebContent::WebDriverConnection> webdriver_client;
+    if (webdriver_fd_passing_socket >= 0)
+        webdriver_client = TRY(create_connection_from_passed_socket<WebContent::WebDriverConnection>(webdriver_fd_passing_socket, "WebDriver"sv, webdriver_notifier, *webcontent_client, webcontent_client->page_host()));
+
     return app.exec();
 }
 

Ladybird/WebContentView.cpp

@@ -54,7 +54,8 @@
 #include <QTreeView>
 #include <QVBoxLayout>
 
-WebContentView::WebContentView()
+WebContentView::WebContentView(int webdriver_fd_passing_socket)
+    : m_webdriver_fd_passing_socket(webdriver_fd_passing_socket)
 {
     setMouseTracking(true);
 
@@ -589,12 +590,15 @@ void WebContentView::create_client()
         auto takeover_string = String::formatted("WebContent:{}", wc_fd);
         MUST(Core::System::setenv("SOCKET_TAKEOVER"sv, takeover_string, true));
 
-        auto fd_passing_socket_string = String::number(wc_fd_passing_fd);
+        auto webcontent_fd_passing_socket_string = String::number(wc_fd_passing_fd);
+        auto webdriver_fd_passing_socket_string = String::number(m_webdriver_fd_passing_socket);
 
         char const* argv[] = {
             "WebContent",
             "--webcontent-fd-passing-socket",
-            fd_passing_socket_string.characters(),
+            webcontent_fd_passing_socket_string.characters(),
+            "--webdriver-fd-passing-socket",
+            webdriver_fd_passing_socket_string.characters(),
             nullptr,
         };
 

Ladybird/WebContentView.h

@@ -48,7 +48,7 @@ class WebContentView final
     , public WebView::ViewImplementation {
     Q_OBJECT
 public:
-    WebContentView();
+    explicit WebContentView(int webdriver_fd_passing_socket);
     virtual ~WebContentView() override;
 
     void load(AK::URL const&);
@@ -201,4 +201,6 @@ private:
     } m_client_state;
 
     RefPtr<Gfx::Bitmap> m_backup_bitmap;
+
+    int m_webdriver_fd_passing_socket { -1 };
 };

Ladybird/main.cpp

@@ -61,12 +61,15 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     Gfx::FontDatabase::set_fixed_width_font_query("Csilla 10 400 0");
 
     StringView raw_url;
+    int webdriver_fd_passing_socket { -1 };
+
     Core::ArgsParser args_parser;
     args_parser.set_general_help("The Ladybird web browser :^)");
     args_parser.add_positional_argument(raw_url, "URL to open", "url", Core::ArgsParser::Required::No);
+    args_parser.add_option(webdriver_fd_passing_socket, "File descriptor of the passing socket for the WebDriver connection", "webdriver-fd-passing-socket", 'd', "webdriver_fd_passing_socket");
     args_parser.parse(arguments);
 
-    BrowserWindow window;
+    BrowserWindow window(webdriver_fd_passing_socket);
     s_settings = new Browser::Settings(&window);
     window.setWindowTitle("Ladybird");
     window.resize(800, 600);