Ladybird: Initial import :^)

Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/1eb653115b
Pull-request: https://github.com/SerenityOS/serenity/pull/16583
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/linusg

Ladybird/.gitignore

@@ -0,0 +1,8 @@
+.qmake.stash
+Makefile
+WebView.o
+ladybird
+main.o
+moc_WebView.cpp
+moc_WebView.o
+moc_predefs.h

Ladybird/WebView.cpp

@@ -0,0 +1,727 @@
+/*
+ * Copyright (c) 2022, Dex♪ <dexes.ttp@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#define AK_DONT_REPLACE_STD
+
+#include "WebView.h"
+#include <AK/Assertions.h>
+#include <AK/ByteBuffer.h>
+#include <AK/Format.h>
+#include <AK/HashTable.h>
+#include <AK/NonnullOwnPtr.h>
+#include <AK/StringBuilder.h>
+#include <AK/Types.h>
+#include <LibCore/ArgsParser.h>
+#include <LibCore/EventLoop.h>
+#include <LibCore/File.h>
+#include <LibCore/IODevice.h>
+#include <LibCore/MemoryStream.h>
+#include <LibCore/Stream.h>
+#include <LibCore/System.h>
+#include <LibCore/Timer.h>
+#include <LibGemini/GeminiRequest.h>
+#include <LibGemini/GeminiResponse.h>
+#include <LibGemini/Job.h>
+#include <LibGfx/Bitmap.h>
+#include <LibGfx/Font/FontDatabase.h>
+#include <LibGfx/ImageDecoder.h>
+#include <LibGfx/PNGWriter.h>
+#include <LibGfx/Rect.h>
+#include <LibHTTP/HttpRequest.h>
+#include <LibHTTP/HttpResponse.h>
+#include <LibHTTP/HttpsJob.h>
+#include <LibHTTP/Job.h>
+#include <LibMain/Main.h>
+#include <LibWeb/Cookie/ParsedCookie.h>
+#include <LibWeb/DOM/Document.h>
+#include <LibWeb/HTML/BrowsingContext.h>
+#include <LibWeb/ImageDecoding.h>
+#include <LibWeb/Layout/InitialContainingBlock.h>
+#include <LibWeb/Loader/ResourceLoader.h>
+#include <LibWeb/Page/Page.h>
+#include <LibWeb/Painting/PaintableBox.h>
+#include <LibWeb/WebSockets/WebSocket.h>
+#include <LibWebSocket/ConnectionInfo.h>
+#include <LibWebSocket/Message.h>
+#include <LibWebSocket/WebSocket.h>
+#include <QPaintEvent>
+#include <QPainter>
+
+class HeadlessBrowserPageClient final : public Web::PageClient {
+public:
+    static NonnullOwnPtr<HeadlessBrowserPageClient> create(WebView& view)
+    {
+        return adopt_own(*new HeadlessBrowserPageClient(view));
+    }
+
+    Web::Page& page() { return *m_page; }
+    Web::Page const& page() const { return *m_page; }
+
+    Web::Layout::InitialContainingBlock* layout_root()
+    {
+        auto* document = page().top_level_browsing_context().active_document();
+        if (!document)
+            return nullptr;
+        return document->layout_node();
+    }
+
+    void load(AK::URL const& url)
+    {
+        page().load(url);
+    }
+
+    void paint(Gfx::IntRect const& content_rect, Gfx::Bitmap& target)
+    {
+        Gfx::Painter painter(target);
+
+        if (auto* document = page().top_level_browsing_context().active_document())
+            document->update_layout();
+
+        painter.fill_rect({ {}, content_rect.size() }, palette().base());
+
+        auto* layout_root = this->layout_root();
+        if (!layout_root) {
+            return;
+        }
+
+        Web::PaintContext context(painter, palette(), content_rect.top_left());
+        context.set_should_show_line_box_borders(false);
+        context.set_viewport_rect(content_rect);
+        context.set_has_focus(true);
+        layout_root->paint_all_phases(context);
+    }
+
+    void setup_palette(Core::AnonymousBuffer theme_buffer)
+    {
+        m_palette_impl = Gfx::PaletteImpl::create_with_anonymous_buffer(theme_buffer);
+    }
+
+    void set_viewport_rect(Gfx::IntRect rect)
+    {
+        m_viewport_rect = rect;
+        page().top_level_browsing_context().set_viewport_rect(rect);
+    }
+
+    // ^Web::PageClient
+    virtual Gfx::Palette palette() const override
+    {
+        return Gfx::Palette(*m_palette_impl);
+    }
+
+    virtual Gfx::IntRect screen_rect() const override
+    {
+        // FIXME: Return the actual screen rect.
+        return m_viewport_rect;
+    }
+
+    Gfx::IntRect viewport_rect() const
+    {
+        return m_viewport_rect;
+    }
+
+    virtual Web::CSS::PreferredColorScheme preferred_color_scheme() const override
+    {
+        return m_preferred_color_scheme;
+    }
+
+    virtual void page_did_change_title(String const&) override
+    {
+    }
+
+    virtual void page_did_set_document_in_top_level_browsing_context(Web::DOM::Document*) override
+    {
+    }
+
+    virtual void page_did_start_loading(AK::URL const&) override
+    {
+    }
+
+    virtual void page_did_finish_loading(AK::URL const&) override
+    {
+    }
+
+    virtual void page_did_change_selection() override
+    {
+    }
+
+    virtual void page_did_request_cursor_change(Gfx::StandardCursor) override
+    {
+    }
+
+    virtual void page_did_request_context_menu(Gfx::IntPoint const&) override
+    {
+    }
+
+    virtual void page_did_request_link_context_menu(Gfx::IntPoint const&, AK::URL const&, String const&, unsigned) override
+    {
+    }
+
+    virtual void page_did_request_image_context_menu(Gfx::IntPoint const&, AK::URL const&, String const&, unsigned, Gfx::Bitmap const*) override
+    {
+    }
+
+    virtual void page_did_click_link(AK::URL const&, String const&, unsigned) override
+    {
+    }
+
+    virtual void page_did_middle_click_link(AK::URL const&, String const&, unsigned) override
+    {
+    }
+
+    virtual void page_did_enter_tooltip_area(Gfx::IntPoint const&, String const&) override
+    {
+    }
+
+    virtual void page_did_leave_tooltip_area() override
+    {
+    }
+
+    virtual void page_did_hover_link(AK::URL const&) override
+    {
+    }
+
+    virtual void page_did_unhover_link() override
+    {
+    }
+
+    virtual void page_did_invalidate(Gfx::IntRect const&) override
+    {
+        m_view.update();
+    }
+
+    virtual void page_did_change_favicon(Gfx::Bitmap const&) override
+    {
+    }
+
+    virtual void page_did_layout() override
+    {
+    }
+
+    virtual void page_did_request_scroll_into_view(Gfx::IntRect const&) override
+    {
+    }
+
+    virtual void page_did_request_alert(String const&) override
+    {
+    }
+
+    virtual bool page_did_request_confirm(String const&) override
+    {
+        return false;
+    }
+
+    virtual String page_did_request_prompt(String const&, String const&) override
+    {
+        return String::empty();
+    }
+
+    virtual String page_did_request_cookie(AK::URL const&, Web::Cookie::Source) override
+    {
+        return String::empty();
+    }
+
+    virtual void page_did_set_cookie(AK::URL const&, Web::Cookie::ParsedCookie const&, Web::Cookie::Source) override
+    {
+    }
+
+    void request_file(NonnullRefPtr<Web::FileRequest>& request) override
+    {
+        auto const file = Core::System::open(request->path(), O_RDONLY);
+        request->on_file_request_finish(file);
+    }
+
+private:
+    HeadlessBrowserPageClient(WebView& view)
+        : m_view(view)
+        , m_page(make<Web::Page>(*this))
+    {
+    }
+
+    WebView& m_view;
+    NonnullOwnPtr<Web::Page> m_page;
+
+    RefPtr<Gfx::PaletteImpl> m_palette_impl;
+    Gfx::IntRect m_viewport_rect { 0, 0, 800, 600 };
+    Web::CSS::PreferredColorScheme m_preferred_color_scheme { Web::CSS::PreferredColorScheme::Auto };
+};
+
+WebView::WebView()
+{
+    m_page_client = HeadlessBrowserPageClient::create(*this);
+
+    m_page_client->setup_palette(Gfx::load_system_theme("/home/kling/src/serenity/Base/res/themes/Default.ini"));
+
+    // FIXME: Allow passing these values as arguments
+    m_page_client->set_viewport_rect({ 0, 0, 800, 600 });
+}
+
+WebView::~WebView()
+{
+}
+
+void WebView::load(String const& url)
+{
+    m_page_client->load(AK::URL(url));
+}
+
+void WebView::paintEvent(QPaintEvent* event)
+{
+    QPainter painter(viewport());
+    painter.setClipRect(event->rect());
+
+    auto output_rect = m_page_client->viewport_rect();
+    auto output_bitmap = MUST(Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRx8888, output_rect.size()));
+
+    dbgln("paintEvent: {}", output_rect);
+
+    m_page_client->paint(output_rect, output_bitmap);
+
+    QImage q_image(output_bitmap->scanline_u8(0), output_bitmap->width(), output_bitmap->height(), QImage::Format_RGB32);
+    painter.drawImage(QPoint(0, 0), q_image);
+}
+
+void WebView::resizeEvent(QResizeEvent* event)
+{
+    Gfx::IntRect rect(0, 0, event->size().width(), event->size().height());
+    m_page_client->set_viewport_rect(rect);
+}
+
+class HeadlessImageDecoderClient : public Web::ImageDecoding::Decoder {
+public:
+    static NonnullRefPtr<HeadlessImageDecoderClient> create()
+    {
+        return adopt_ref(*new HeadlessImageDecoderClient());
+    }
+
+    virtual ~HeadlessImageDecoderClient() override = default;
+
+    virtual Optional<Web::ImageDecoding::DecodedImage> decode_image(ReadonlyBytes data) override
+    {
+        auto decoder = Gfx::ImageDecoder::try_create(data);
+
+        if (!decoder)
+            return Web::ImageDecoding::DecodedImage { false, 0, Vector<Web::ImageDecoding::Frame> {} };
+
+        if (!decoder->frame_count())
+            return Web::ImageDecoding::DecodedImage { false, 0, Vector<Web::ImageDecoding::Frame> {} };
+
+        Vector<Web::ImageDecoding::Frame> frames;
+        for (size_t i = 0; i < decoder->frame_count(); ++i) {
+            auto frame_or_error = decoder->frame(i);
+            if (frame_or_error.is_error()) {
+                frames.append({ {}, 0 });
+            } else {
+                auto frame = frame_or_error.release_value();
+                frames.append({ move(frame.image), static_cast<size_t>(frame.duration) });
+            }
+        }
+
+        return Web::ImageDecoding::DecodedImage {
+            decoder->is_animated(),
+            static_cast<u32>(decoder->loop_count()),
+            frames,
+        };
+    }
+
+private:
+    explicit HeadlessImageDecoderClient() = default;
+};
+
+static HashTable<RefPtr<Web::ResourceLoaderConnectorRequest>> s_all_requests;
+
+class HeadlessRequestServer : public Web::ResourceLoaderConnector {
+public:
+    class HTTPHeadlessRequest
+        : public Web::ResourceLoaderConnectorRequest
+        , public Weakable<HTTPHeadlessRequest> {
+    public:
+        static ErrorOr<NonnullRefPtr<HTTPHeadlessRequest>> create(String const& method, AK::URL const& url, HashMap<String, String> const& request_headers, ReadonlyBytes request_body, Core::ProxyData const&)
+        {
+            auto stream_backing_buffer = TRY(ByteBuffer::create_uninitialized(1 * MiB));
+            auto underlying_socket = TRY(Core::Stream::TCPSocket::connect(url.host(), url.port().value_or(80)));
+            TRY(underlying_socket->set_blocking(false));
+            auto socket = TRY(Core::Stream::BufferedSocket<Core::Stream::TCPSocket>::create(move(underlying_socket)));
+
+            HTTP::HttpRequest request;
+            if (method.equals_ignoring_case("head"sv))
+                request.set_method(HTTP::HttpRequest::HEAD);
+            else if (method.equals_ignoring_case("get"sv))
+                request.set_method(HTTP::HttpRequest::GET);
+            else if (method.equals_ignoring_case("post"sv))
+                request.set_method(HTTP::HttpRequest::POST);
+            else
+                request.set_method(HTTP::HttpRequest::Invalid);
+            request.set_url(move(url));
+            request.set_headers(request_headers);
+            request.set_body(TRY(ByteBuffer::copy(request_body)));
+
+            return adopt_ref(*new HTTPHeadlessRequest(move(request), move(socket), move(stream_backing_buffer)));
+        }
+
+        virtual ~HTTPHeadlessRequest() override
+        {
+        }
+
+        virtual void set_should_buffer_all_input(bool) override
+        {
+        }
+
+        virtual bool stop() override
+        {
+            return false;
+        }
+
+        virtual void stream_into(Core::Stream::Stream&) override
+        {
+        }
+
+    private:
+        HTTPHeadlessRequest(HTTP::HttpRequest&& request, NonnullOwnPtr<Core::Stream::BufferedSocketBase> socket, ByteBuffer&& stream_backing_buffer)
+            : m_stream_backing_buffer(move(stream_backing_buffer))
+            , m_output_stream(Core::Stream::MemoryStream::construct(m_stream_backing_buffer.bytes()).release_value_but_fixme_should_propagate_errors())
+            , m_socket(move(socket))
+            , m_job(HTTP::Job::construct(move(request), *m_output_stream))
+        {
+            m_job->on_headers_received = [weak_this = make_weak_ptr()](auto& response_headers, auto response_code) mutable {
+                if (auto strong_this = weak_this.strong_ref()) {
+                    strong_this->m_response_code = response_code;
+                    for (auto& header : response_headers) {
+                        strong_this->m_response_headers.set(header.key, header.value);
+                    }
+                }
+            };
+            m_job->on_finish = [weak_this = make_weak_ptr()](bool success) mutable {
+                Core::deferred_invoke([weak_this, success]() mutable {
+                    if (auto strong_this = weak_this.strong_ref()) {
+                        ReadonlyBytes response_bytes { strong_this->m_output_stream->bytes().data(), strong_this->m_output_stream->offset() };
+                        auto response_buffer = ByteBuffer::copy(response_bytes).release_value_but_fixme_should_propagate_errors();
+                        strong_this->on_buffered_request_finish(success, strong_this->m_output_stream->offset(), strong_this->m_response_headers, strong_this->m_response_code, response_buffer);
+                    } });
+            };
+            m_job->start(*m_socket);
+        }
+
+        Optional<u32> m_response_code;
+        ByteBuffer m_stream_backing_buffer;
+        NonnullOwnPtr<Core::Stream::MemoryStream> m_output_stream;
+        NonnullOwnPtr<Core::Stream::BufferedSocketBase> m_socket;
+        NonnullRefPtr<HTTP::Job> m_job;
+        HashMap<String, String, CaseInsensitiveStringTraits> m_response_headers;
+    };
+
+    class HTTPSHeadlessRequest
+        : public Web::ResourceLoaderConnectorRequest
+        , public Weakable<HTTPSHeadlessRequest> {
+    public:
+        static ErrorOr<NonnullRefPtr<HTTPSHeadlessRequest>> create(String const& method, AK::URL const& url, HashMap<String, String> const& request_headers, ReadonlyBytes request_body, Core::ProxyData const&)
+        {
+            auto stream_backing_buffer = TRY(ByteBuffer::create_uninitialized(1 * MiB));
+            auto underlying_socket = TRY(TLS::TLSv12::connect(url.host(), url.port().value_or(80)));
+            TRY(underlying_socket->set_blocking(false));
+            auto socket = TRY(Core::Stream::BufferedSocket<TLS::TLSv12>::create(move(underlying_socket)));
+
+            HTTP::HttpRequest request;
+            if (method.equals_ignoring_case("head"sv))
+                request.set_method(HTTP::HttpRequest::HEAD);
+            else if (method.equals_ignoring_case("get"sv))
+                request.set_method(HTTP::HttpRequest::GET);
+            else if (method.equals_ignoring_case("post"sv))
+                request.set_method(HTTP::HttpRequest::POST);
+            else
+                request.set_method(HTTP::HttpRequest::Invalid);
+            request.set_url(move(url));
+            request.set_headers(request_headers);
+            request.set_body(TRY(ByteBuffer::copy(request_body)));
+
+            return adopt_ref(*new HTTPSHeadlessRequest(move(request), move(socket), move(stream_backing_buffer)));
+        }
+
+        virtual ~HTTPSHeadlessRequest() override
+        {
+        }
+
+        virtual void set_should_buffer_all_input(bool) override
+        {
+        }
+
+        virtual bool stop() override
+        {
+            return false;
+        }
+
+        virtual void stream_into(Core::Stream::Stream&) override
+        {
+        }
+
+    private:
+        HTTPSHeadlessRequest(HTTP::HttpRequest&& request, NonnullOwnPtr<Core::Stream::BufferedSocketBase> socket, ByteBuffer&& stream_backing_buffer)
+            : m_stream_backing_buffer(move(stream_backing_buffer))
+            , m_output_stream(Core::Stream::MemoryStream::construct(m_stream_backing_buffer.bytes()).release_value_but_fixme_should_propagate_errors())
+            , m_socket(move(socket))
+            , m_job(HTTP::HttpsJob::construct(move(request), *m_output_stream))
+        {
+            m_job->on_headers_received = [weak_this = make_weak_ptr()](auto& response_headers, auto response_code) mutable {
+                if (auto strong_this = weak_this.strong_ref()) {
+                    strong_this->m_response_code = response_code;
+                    for (auto& header : response_headers) {
+                        strong_this->m_response_headers.set(header.key, header.value);
+                    }
+                }
+            };
+            m_job->on_finish = [weak_this = make_weak_ptr()](bool success) mutable {
+                Core::deferred_invoke([weak_this, success]() mutable {
+                    if (auto strong_this = weak_this.strong_ref()) {
+                        ReadonlyBytes response_bytes { strong_this->m_output_stream->bytes().data(), strong_this->m_output_stream->offset() };
+                        auto response_buffer = ByteBuffer::copy(response_bytes).release_value_but_fixme_should_propagate_errors();
+                        strong_this->on_buffered_request_finish(success, strong_this->m_output_stream->offset(), strong_this->m_response_headers, strong_this->m_response_code, response_buffer);
+                    } });
+            };
+            m_job->start(*m_socket);
+        }
+
+        Optional<u32> m_response_code;
+        ByteBuffer m_stream_backing_buffer;
+        NonnullOwnPtr<Core::Stream::MemoryStream> m_output_stream;
+        NonnullOwnPtr<Core::Stream::BufferedSocketBase> m_socket;
+        NonnullRefPtr<HTTP::HttpsJob> m_job;
+        HashMap<String, String, CaseInsensitiveStringTraits> m_response_headers;
+    };
+
+    class GeminiHeadlessRequest
+        : public Web::ResourceLoaderConnectorRequest
+        , public Weakable<GeminiHeadlessRequest> {
+    public:
+        static ErrorOr<NonnullRefPtr<GeminiHeadlessRequest>> create(String const&, AK::URL const& url, HashMap<String, String> const&, ReadonlyBytes, Core::ProxyData const&)
+        {
+            auto stream_backing_buffer = TRY(ByteBuffer::create_uninitialized(1 * MiB));
+            auto underlying_socket = TRY(Core::Stream::TCPSocket::connect(url.host(), url.port().value_or(80)));
+            TRY(underlying_socket->set_blocking(false));
+            auto socket = TRY(Core::Stream::BufferedSocket<Core::Stream::TCPSocket>::create(move(underlying_socket)));
+
+            Gemini::GeminiRequest request;
+            request.set_url(url);
+
+            return adopt_ref(*new GeminiHeadlessRequest(move(request), move(socket), move(stream_backing_buffer)));
+        }
+
+        virtual ~GeminiHeadlessRequest() override
+        {
+        }
+
+        virtual void set_should_buffer_all_input(bool) override
+        {
+        }
+
+        virtual bool stop() override
+        {
+            return false;
+        }
+
+        virtual void stream_into(Core::Stream::Stream&) override
+        {
+        }
+
+    private:
+        GeminiHeadlessRequest(Gemini::GeminiRequest&& request, NonnullOwnPtr<Core::Stream::BufferedSocketBase> socket, ByteBuffer&& stream_backing_buffer)
+            : m_stream_backing_buffer(move(stream_backing_buffer))
+            , m_output_stream(Core::Stream::MemoryStream::construct(m_stream_backing_buffer.bytes()).release_value_but_fixme_should_propagate_errors())
+            , m_socket(move(socket))
+            , m_job(Gemini::Job::construct(move(request), *m_output_stream))
+        {
+            m_job->on_headers_received = [weak_this = make_weak_ptr()](auto& response_headers, auto response_code) mutable {
+                if (auto strong_this = weak_this.strong_ref()) {
+                    strong_this->m_response_code = response_code;
+                    for (auto& header : response_headers) {
+                        strong_this->m_response_headers.set(header.key, header.value);
+                    }
+                }
+            };
+            m_job->on_finish = [weak_this = make_weak_ptr()](bool success) mutable {
+                Core::deferred_invoke([weak_this, success]() mutable {
+                    if (auto strong_this = weak_this.strong_ref()) {
+                        ReadonlyBytes response_bytes { strong_this->m_output_stream->bytes().data(), strong_this->m_output_stream->offset() };
+                        auto response_buffer = ByteBuffer::copy(response_bytes).release_value_but_fixme_should_propagate_errors();
+                        strong_this->on_buffered_request_finish(success, strong_this->m_output_stream->offset(), strong_this->m_response_headers, strong_this->m_response_code, response_buffer);
+                    } });
+            };
+            m_job->start(*m_socket);
+        }
+
+        Optional<u32> m_response_code;
+        ByteBuffer m_stream_backing_buffer;
+        NonnullOwnPtr<Core::Stream::MemoryStream> m_output_stream;
+        NonnullOwnPtr<Core::Stream::BufferedSocketBase> m_socket;
+        NonnullRefPtr<Gemini::Job> m_job;
+        HashMap<String, String, CaseInsensitiveStringTraits> m_response_headers;
+    };
+
+    static NonnullRefPtr<HeadlessRequestServer> create()
+    {
+        return adopt_ref(*new HeadlessRequestServer());
+    }
+
+    virtual ~HeadlessRequestServer() override { }
+
+    virtual void prefetch_dns(AK::URL const&) override { }
+    virtual void preconnect(AK::URL const&) override { }
+
+    virtual RefPtr<Web::ResourceLoaderConnectorRequest> start_request(String const& method, AK::URL const& url, HashMap<String, String> const& request_headers, ReadonlyBytes request_body, Core::ProxyData const& proxy) override
+    {
+        RefPtr<Web::ResourceLoaderConnectorRequest> request;
+        if (url.protocol().equals_ignoring_case("http"sv)) {
+            auto request_or_error = HTTPHeadlessRequest::create(method, url, request_headers, request_body, proxy);
+            if (request_or_error.is_error())
+                return {};
+            request = request_or_error.release_value();
+        }
+        if (url.protocol().equals_ignoring_case("https"sv)) {
+            auto request_or_error = HTTPSHeadlessRequest::create(method, url, request_headers, request_body, proxy);
+            if (request_or_error.is_error())
+                return {};
+            request = request_or_error.release_value();
+        }
+        if (url.protocol().equals_ignoring_case("gemini"sv)) {
+            auto request_or_error = GeminiHeadlessRequest::create(method, url, request_headers, request_body, proxy);
+            if (request_or_error.is_error())
+                return {};
+            request = request_or_error.release_value();
+        }
+        if (request)
+            s_all_requests.set(request);
+        return request;
+    }
+
+private:
+    HeadlessRequestServer() { }
+};
+
+class HeadlessWebSocketClientManager : public Web::WebSockets::WebSocketClientManager {
+public:
+    class HeadlessWebSocket
+        : public Web::WebSockets::WebSocketClientSocket
+        , public Weakable<HeadlessWebSocket> {
+    public:
+        static NonnullRefPtr<HeadlessWebSocket> create(NonnullRefPtr<WebSocket::WebSocket> underlying_socket)
+        {
+            return adopt_ref(*new HeadlessWebSocket(move(underlying_socket)));
+        }
+
+        virtual ~HeadlessWebSocket() override
+        {
+        }
+
+        virtual Web::WebSockets::WebSocket::ReadyState ready_state() override
+        {
+            switch (m_websocket->ready_state()) {
+            case WebSocket::ReadyState::Connecting:
+                return Web::WebSockets::WebSocket::ReadyState::Connecting;
+            case WebSocket::ReadyState::Open:
+                return Web::WebSockets::WebSocket::ReadyState::Open;
+            case WebSocket::ReadyState::Closing:
+                return Web::WebSockets::WebSocket::ReadyState::Closing;
+            case WebSocket::ReadyState::Closed:
+                return Web::WebSockets::WebSocket::ReadyState::Closed;
+            }
+            VERIFY_NOT_REACHED();
+        }
+
+        virtual void send(ByteBuffer binary_or_text_message, bool is_text) override
+        {
+            m_websocket->send(WebSocket::Message(binary_or_text_message, is_text));
+        }
+
+        virtual void send(StringView message) override
+        {
+            m_websocket->send(WebSocket::Message(message));
+        }
+
+        virtual void close(u16 code, String reason) override
+        {
+            m_websocket->close(code, reason);
+        }
+
+    private:
+        HeadlessWebSocket(NonnullRefPtr<WebSocket::WebSocket> underlying_socket)
+            : m_websocket(move(underlying_socket))
+        {
+            m_websocket->on_open = [weak_this = make_weak_ptr()] {
+                if (auto strong_this = weak_this.strong_ref())
+                    if (strong_this->on_open)
+                        strong_this->on_open();
+            };
+            m_websocket->on_message = [weak_this = make_weak_ptr()](auto message) {
+                if (auto strong_this = weak_this.strong_ref()) {
+                    if (strong_this->on_message) {
+                        strong_this->on_message(Web::WebSockets::WebSocketClientSocket::Message {
+                            .data = move(message.data()),
+                            .is_text = message.is_text(),
+                        });
+                    }
+                }
+            };
+            m_websocket->on_error = [weak_this = make_weak_ptr()](auto error) {
+                if (auto strong_this = weak_this.strong_ref()) {
+                    if (strong_this->on_error) {
+                        switch (error) {
+                        case WebSocket::WebSocket::Error::CouldNotEstablishConnection:
+                            strong_this->on_error(Web::WebSockets::WebSocketClientSocket::Error::CouldNotEstablishConnection);
+                            return;
+                        case WebSocket::WebSocket::Error::ConnectionUpgradeFailed:
+                            strong_this->on_error(Web::WebSockets::WebSocketClientSocket::Error::ConnectionUpgradeFailed);
+                            return;
+                        case WebSocket::WebSocket::Error::ServerClosedSocket:
+                            strong_this->on_error(Web::WebSockets::WebSocketClientSocket::Error::ServerClosedSocket);
+                            return;
+                        }
+                        VERIFY_NOT_REACHED();
+                    }
+                }
+            };
+            m_websocket->on_close = [weak_this = make_weak_ptr()](u16 code, String reason, bool was_clean) {
+                if (auto strong_this = weak_this.strong_ref())
+                    if (strong_this->on_close)
+                        strong_this->on_close(code, move(reason), was_clean);
+            };
+        }
+
+        NonnullRefPtr<WebSocket::WebSocket> m_websocket;
+    };
+
+    static NonnullRefPtr<HeadlessWebSocketClientManager> create()
+    {
+        return adopt_ref(*new HeadlessWebSocketClientManager());
+    }
+
+    virtual ~HeadlessWebSocketClientManager() override { }
+
+    virtual RefPtr<Web::WebSockets::WebSocketClientSocket> connect(AK::URL const& url, String const& origin) override
+    {
+        WebSocket::ConnectionInfo connection_info(url);
+        connection_info.set_origin(origin);
+
+        auto connection = HeadlessWebSocket::create(WebSocket::WebSocket::create(move(connection_info)));
+        return connection;
+    }
+
+private:
+    HeadlessWebSocketClientManager() { }
+};
+
+void initialize_web_engine()
+{
+    Web::ImageDecoding::Decoder::initialize(HeadlessImageDecoderClient::create());
+    Web::ResourceLoader::initialize(HeadlessRequestServer::create());
+    Web::WebSockets::WebSocketClientManager::initialize(HeadlessWebSocketClientManager::create());
+
+    Web::FrameLoader::set_default_favicon_path("/home/kling/src/serenity/Base/res/icons/16x16/app-browser.png");
+
+    Gfx::FontDatabase::set_default_fonts_lookup_path("/home/kling/src/serenity/Base/res/fonts");
+
+    Gfx::FontDatabase::set_default_font_query("Katica 10 400 0");
+    Gfx::FontDatabase::set_fixed_width_font_query("Csilla 10 400 0");
+
+    Web::FrameLoader::set_error_page_url("file:///home/kling/src/serenity/Base/res/html/error.html");
+}

Ladybird/WebView.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#define AK_DONT_REPLACE_STD
+
+#include <AK/OwnPtr.h>
+#include <AK/String.h>
+#include <QAbstractScrollArea>
+
+class HeadlessBrowserPageClient;
+
+class WebView final : public QAbstractScrollArea {
+    Q_OBJECT
+public:
+    WebView();
+    virtual ~WebView() override;
+
+    void load(String const& url);
+
+    virtual void paintEvent(QPaintEvent*) override;
+    virtual void resizeEvent(QResizeEvent*) override;
+
+private:
+    OwnPtr<HeadlessBrowserPageClient> m_page_client;
+};

Ladybird/ladybird.pro

@@ -0,0 +1,39 @@
+######################################################################
+# Automatically generated by qmake (3.1) Sun Jul 3 19:48:59 2022
+######################################################################
+
+QT += widgets
+TEMPLATE = app
+TARGET = ladybird
+INCLUDEPATH += \
+    /home/kling/src/serenity/ \
+    /home/kling/src/serenity/Userland/Libraries/ \
+    /home/kling/src/serenity/Build/x86_64/Userland/Libraries/ \
+    /home/kling/src/serenity/Build/x86_64/ \
+    .
+
+# You can make your code fail to compile if you use deprecated APIs.
+# In order to do so, uncomment the following line.
+# Please consult the documentation of the deprecated API in order to know
+# how to port your code away from it.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+# Input
+HEADERS += WebView.h
+SOURCES += main.cpp WebView.cpp
+
+QMAKE_LIBDIR += /home/kling/src/serenity/Build/lagom/
+
+LIBS += \
+    -llagom-web \
+    -llagom-gemini \
+    -llagom-gfx \
+    -llagom-crypto \
+    -llagom-core \
+    -llagom-http \
+    -llagom-tls \
+    -llagom-websocket \
+    -llagom-main
+
+QMAKE_CXXFLAGS += -std=c++20 -Wno-expansion-to-defined -Wno-literal-suffix -Wno-deprecated-enum-enum-conversion

Ladybird/main.cpp

@@ -0,0 +1,43 @@
+#include "WebView.h"
+#include <LibCore/ArgsParser.h>
+#include <LibCore/EventLoop.h>
+#include <LibCore/Timer.h>
+#include <LibMain/Main.h>
+#include <QApplication>
+#include <QMainWindow>
+#include <QWidget>
+
+extern void initialize_web_engine();
+
+ErrorOr<int> serenity_main(Main::Arguments arguments)
+{
+    initialize_web_engine();
+
+    String url;
+    Core::ArgsParser args_parser;
+    args_parser.set_general_help("The Ladybird web browser :^)");
+    args_parser.add_positional_argument(url, "URL to open", "url", Core::ArgsParser::Required::No);
+    args_parser.parse(arguments);
+
+    Core::EventLoop event_loop;
+
+    QApplication app(arguments.argc, arguments.argv);
+    QMainWindow window;
+    window.setWindowTitle("Ladybird");
+    window.resize(800, 600);
+    window.show();
+
+    WebView view;
+    window.setCentralWidget(&view);
+
+    auto qt_event_loop_driver = Core::Timer::create_repeating(50, [&] {
+        app.processEvents();
+    });
+    qt_event_loop_driver->start();
+
+    if (!url.is_empty()) {
+        view.load(url);
+    }
+
+    return event_loop.exec();
+}