ladybird/Libraries/LibWebView/WebContentClient.cpp

/*
 * Copyright (c) 2020-2021, Andreas Kling <andreas@ladybird.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <LibHTTP/Cookie/ParsedCookie.h>
#include <LibIPC/TransportHandle.h>
#include <LibWebView/Application.h>
#include <LibWebView/CookieJar.h>
#include <LibWebView/HelperProcess.h>
#include <LibWebView/SourceHighlighter.h>
#include <LibWebView/ViewImplementation.h>
#include <LibWebView/WebContentClient.h>
#include <LibWebView/WebUI.h>

namespace WebView {

HashTable<WebContentClient*> WebContentClient::s_clients;

Optional<ViewImplementation&> WebContentClient::view_for_pid_and_page_id(pid_t pid, u64 page_id)
{
    for (auto* client : s_clients) {
        if (client->m_process_handle.pid == pid)
            return client->view_for_page_id(page_id);
    }
    return {};
}

WebContentClient::WebContentClient(NonnullOwnPtr<IPC::Transport> transport, ViewImplementation& view)
    : IPC::ConnectionToServer<WebContentClientEndpoint, WebContentServerEndpoint>(*this, move(transport))
{
    s_clients.set(this);
    m_views.set(0, view);
}

WebContentClient::WebContentClient(NonnullOwnPtr<IPC::Transport> transport)
    : IPC::ConnectionToServer<WebContentClientEndpoint, WebContentServerEndpoint>(*this, move(transport))
{
    s_clients.set(this);
}

WebContentClient::~WebContentClient()
{
    s_clients.remove(this);
}

void WebContentClient::die()
{
    // Intentionally empty. Restart is handled at another level.
}

void WebContentClient::assign_view(Badge<Application>, ViewImplementation& view)
{
    VERIFY(m_views.is_empty());
    m_views.set(0, view);
}

void WebContentClient::register_view(u64 page_id, ViewImplementation& view)
{
    VERIFY(page_id > 0);
    m_views.set(page_id, view);
}

void WebContentClient::unregister_view(u64 page_id)
{
    m_views.remove(page_id);
    if (m_views.is_empty())
        async_close_server();
}

void WebContentClient::web_ui_disconnected(Badge<WebUI>)
{
    m_web_ui.clear();
}

void WebContentClient::notify_all_views_of_crash()
{
    // Collect view IDs first, then use deferred_invoke to handle crashes safely
    // (avoids signal handler deadlock and allows views to be looked up by ID
    // in case they're destroyed before the deferred_invoke runs).
    Vector<u64> view_ids;
    view_ids.ensure_capacity(m_views.size());
    for (auto& [page_id, view] : m_views)
        view_ids.unchecked_append(view->view_id());

    for (auto view_id : view_ids) {
        Core::deferred_invoke([view_id] {
            auto view = ViewImplementation::find_view_by_id(view_id);
            if (!view.has_value())
                return;
            view->handle_web_content_process_crash();
            if (view->on_web_content_crashed)
                view->on_web_content_crashed();
        });
    }
}

void WebContentClient::did_paint(u64 page_id, Gfx::IntRect rect, i32 bitmap_id)
{
    if (auto view = view_for_page_id(page_id); view.has_value())
        view->server_did_paint({}, bitmap_id, rect.size());
}

void WebContentClient::did_request_new_process_for_navigation(u64 page_id, URL::URL url)
{
    if (auto view = view_for_page_id(page_id); view.has_value())
        view->create_new_process_for_cross_site_navigation(url);
}

void WebContentClient::did_start_loading(u64 page_id, URL::URL url, bool is_redirect)
{
    if (auto process = WebView::Application::the().find_process(m_process_handle.pid); process.has_value())
        process->set_title(OptionalNone {});

    if (auto view = view_for_page_id(page_id); view.has_value()) {
        view->set_url({}, url);

        if (view->on_load_start)
            view->on_load_start(url, is_redirect);

        for (auto const& [id, listener] : view->m_navigation_listeners) {
            if (listener.on_load_start)
                listener.on_load_start(url, is_redirect);
        }
    }
}

void WebContentClient::did_finish_loading(u64 page_id, URL::URL url)
{
    if (url.scheme() == "about"sv && url.paths().size() == 1) {
        if (auto web_ui = WebUI::create(*this, url.paths().first()); web_ui.is_error())
            warnln("Could not create WebUI for {}: {}", url, web_ui.error());
        else
            m_web_ui = web_ui.release_value();
    }

    if (auto view = view_for_page_id(page_id); view.has_value()) {
        view->set_url({}, url);

        if (view->on_load_finish)
            view->on_load_finish(url);

        for (auto const& [id, listener] : view->m_navigation_listeners) {
            if (listener.on_load_finish)
                listener.on_load_finish(url);
        }
    }
}

void WebContentClient::did_finish_test(u64 page_id, String text)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_test_finish)
            view->on_test_finish(text);
    }
}

void WebContentClient::did_set_test_timeout(u64 page_id, double milliseconds)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_set_test_timeout)
            view->on_set_test_timeout(milliseconds);
    }
}

void WebContentClient::did_receive_reference_test_metadata(u64 page_id, JsonValue metadata)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_reference_test_metadata)
            view->on_reference_test_metadata(metadata);
    }
}

void WebContentClient::did_receive_test_variant_metadata(u64 page_id, JsonValue metadata)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_test_variant_metadata)
            view->on_test_variant_metadata(metadata);
    }
}

void WebContentClient::did_set_browser_zoom(u64 page_id, double factor)
{
    if (auto view = view_for_page_id(page_id); view.has_value())
        view->set_zoom(factor);
}

void WebContentClient::did_find_in_page(u64 page_id, size_t current_match_index, Optional<size_t> total_match_count)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_find_in_page)
            view->on_find_in_page(current_match_index, total_match_count);
    }
}

void WebContentClient::did_request_refresh(u64 page_id)
{
    if (auto view = view_for_page_id(page_id); view.has_value())
        view->reload();
}

void WebContentClient::did_request_cursor_change(u64 page_id, Gfx::Cursor cursor)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_cursor_change)
            view->on_cursor_change(cursor);
    }
}

void WebContentClient::did_change_title(u64 page_id, Utf16String title)
{
    if (auto process = WebView::Application::the().find_process(m_process_handle.pid); process.has_value())
        process->set_title(title);

    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (title.is_empty())
            title = Utf16String::from_utf8(view->url().serialize());

        view->set_title({}, title);

        if (view->on_title_change)
            view->on_title_change(title);
    }
}

void WebContentClient::did_change_url(u64 page_id, URL::URL url)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        view->set_url({}, url);

        if (view->on_url_change)
            view->on_url_change(url);
    }
}

void WebContentClient::did_request_tooltip_override(u64 page_id, Gfx::IntPoint position, ByteString title)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_request_tooltip_override)
            view->on_request_tooltip_override(view->to_widget_position(position), title);
    }
}

void WebContentClient::did_stop_tooltip_override(u64 page_id)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_stop_tooltip_override)
            view->on_stop_tooltip_override();
    }
}

void WebContentClient::did_enter_tooltip_area(u64 page_id, ByteString title)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_enter_tooltip_area)
            view->on_enter_tooltip_area(title);
    }
}

void WebContentClient::did_leave_tooltip_area(u64 page_id)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_leave_tooltip_area)
            view->on_leave_tooltip_area();
    }
}

void WebContentClient::did_hover_link(u64 page_id, URL::URL url)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_link_hover)
            view->on_link_hover(url);
    }
}

void WebContentClient::did_unhover_link(u64 page_id)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_link_unhover)
            view->on_link_unhover();
    }
}

void WebContentClient::did_click_link(u64 page_id, URL::URL url, ByteString target, unsigned modifiers)
{
    if (modifiers == Web::UIEvents::Mod_PlatformCtrl)
        Application::the().open_url_in_new_tab(url, Web::HTML::ActivateTab::No);
    else if (target == "_blank"sv)
        Application::the().open_url_in_new_tab(url, Web::HTML::ActivateTab::Yes);
    else if (auto view = view_for_page_id(page_id); view.has_value())
        view->load(url);
}

void WebContentClient::did_middle_click_link(u64, URL::URL url, ByteString, unsigned)
{
    Application::the().open_url_in_new_tab(url, Web::HTML::ActivateTab::No);
}

void WebContentClient::did_request_context_menu(u64 page_id, Gfx::IntPoint content_position)
{
    if (auto view = view_for_page_id(page_id); view.has_value())
        view->did_request_page_context_menu({}, content_position);
}

void WebContentClient::did_request_link_context_menu(u64 page_id, Gfx::IntPoint content_position, URL::URL url, ByteString, unsigned)
{
    if (auto view = view_for_page_id(page_id); view.has_value())
        view->did_request_link_context_menu({}, content_position, move(url));
}

void WebContentClient::did_request_image_context_menu(u64 page_id, Gfx::IntPoint content_position, URL::URL url, ByteString, unsigned, Optional<Gfx::ShareableBitmap> bitmap)
{
    if (auto view = view_for_page_id(page_id); view.has_value())
        view->did_request_image_context_menu({}, content_position, move(url), move(bitmap));
}

void WebContentClient::did_request_media_context_menu(u64 page_id, Gfx::IntPoint content_position, ByteString, unsigned, Web::Page::MediaContextMenu menu)
{
    if (auto view = view_for_page_id(page_id); view.has_value())
        view->did_request_media_context_menu({}, content_position, move(menu));
}

void WebContentClient::did_get_source(u64, URL::URL url, URL::URL base_url, String source)
{
    if (auto view = Application::the().open_blank_new_tab(Web::HTML::ActivateTab::Yes); view.has_value()) {
        auto html = highlight_source(url, base_url, source, Syntax::Language::HTML, WebView::HighlightOutputMode::FullDocument);
        view->load_html(html);
    }
}

static JsonObject parse_json(StringView json, StringView name)
{
    auto parsed_tree = JsonValue::from_string(json);
    if (parsed_tree.is_error()) {
        dbgln("Unable to parse {}: {}", name, parsed_tree.error());
        return {};
    }

    if (!parsed_tree.value().is_object()) {
        dbgln("Expected {} to be an object: {}", name, parsed_tree.value());
        return {};
    }

    return move(parsed_tree.release_value().as_object());
}

void WebContentClient::did_inspect_dom_tree(u64 page_id, String dom_tree)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_received_dom_tree)
            view->on_received_dom_tree(parse_json(dom_tree, "DOM tree"sv));
    }
}

void WebContentClient::did_inspect_dom_node(u64 page_id, DOMNodeProperties properties)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_received_dom_node_properties)
            view->on_received_dom_node_properties(move(properties));
    }
}

void WebContentClient::did_inspect_accessibility_tree(u64 page_id, String accessibility_tree)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_received_accessibility_tree)
            view->on_received_accessibility_tree(parse_json(accessibility_tree, "accessibility tree"sv));
    }
}

void WebContentClient::did_get_hovered_node_id(u64 page_id, Web::UniqueNodeID node_id)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_received_hovered_node_id)
            view->on_received_hovered_node_id(node_id);
    }
}

void WebContentClient::did_finish_editing_dom_node(u64 page_id, Optional<Web::UniqueNodeID> node_id)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_finished_editing_dom_node)
            view->on_finished_editing_dom_node(node_id);
    }
}

void WebContentClient::did_mutate_dom(u64 page_id, Mutation mutation)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_dom_mutation_received)
            view->on_dom_mutation_received(move(mutation));
    }
}

void WebContentClient::did_get_dom_node_html(u64 page_id, String html)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_received_dom_node_html)
            view->on_received_dom_node_html(move(html));
    }
}

void WebContentClient::did_list_style_sheets(u64 page_id, Vector<Web::CSS::StyleSheetIdentifier> stylesheets)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_received_style_sheet_list)
            view->on_received_style_sheet_list(stylesheets);
    }
}

void WebContentClient::did_get_style_sheet_source(u64 page_id, Web::CSS::StyleSheetIdentifier identifier, URL::URL base_url, String source)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_received_style_sheet_source)
            view->on_received_style_sheet_source(identifier, base_url, source);
    }
}

void WebContentClient::did_take_screenshot(u64 page_id, Gfx::ShareableBitmap screenshot)
{
    if (auto view = view_for_page_id(page_id); view.has_value())
        view->did_receive_screenshot({}, screenshot);
}

void WebContentClient::did_get_internal_page_info(u64 page_id, WebView::PageInfoType type, Optional<Core::AnonymousBuffer> info)
{
    if (auto view = view_for_page_id(page_id); view.has_value())
        view->did_receive_internal_page_info({}, type, info);
}

void WebContentClient::did_execute_js_console_input(u64 page_id, JsonValue result)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_received_js_console_result)
            view->on_received_js_console_result(move(result));
    }
}

void WebContentClient::did_output_js_console_message(u64 page_id, ConsoleOutput console_output)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_console_message)
            view->on_console_message(move(console_output));
    }
}

void WebContentClient::did_start_network_request(u64 page_id, u64 request_id, URL::URL url, ByteString method, Vector<HTTP::Header> request_headers, ByteBuffer request_body, Optional<String> initiator_type)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_network_request_started)
            view->on_network_request_started(request_id, url, method, request_headers, move(request_body), move(initiator_type));
    }
}

void WebContentClient::did_receive_network_response_headers(u64 page_id, u64 request_id, u32 status_code, Optional<String> reason_phrase, Vector<HTTP::Header> response_headers)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_network_response_headers_received)
            view->on_network_response_headers_received(request_id, status_code, reason_phrase, response_headers);
    }
}

void WebContentClient::did_receive_network_response_body(u64 page_id, u64 request_id, ByteBuffer data)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_network_response_body_received)
            view->on_network_response_body_received(request_id, move(data));
    }
}

void WebContentClient::did_finish_network_request(u64 page_id, u64 request_id, u64 body_size, Requests::RequestTimingInfo timing_info, Optional<Requests::NetworkError> network_error)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_network_request_finished)
            view->on_network_request_finished(request_id, body_size, timing_info, network_error);
    }
}

void WebContentClient::did_request_alert(u64 page_id, String message)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_request_alert)
            view->on_request_alert(message);
    }
}

void WebContentClient::did_request_confirm(u64 page_id, String message)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_request_confirm)
            view->on_request_confirm(message);
    }
}

void WebContentClient::did_request_prompt(u64 page_id, String message, String default_)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_request_prompt)
            view->on_request_prompt(message, default_);
    }
}

void WebContentClient::did_request_set_prompt_text(u64 page_id, String message)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_request_set_prompt_text)
            view->on_request_set_prompt_text(message);
    }
}

void WebContentClient::did_request_accept_dialog(u64 page_id)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_request_accept_dialog)
            view->on_request_accept_dialog();
    }
}

void WebContentClient::did_request_dismiss_dialog(u64 page_id)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_request_dismiss_dialog)
            view->on_request_dismiss_dialog();
    }
}

void WebContentClient::did_change_favicon(u64 page_id, Gfx::ShareableBitmap favicon)
{
    if (!favicon.is_valid()) {
        dbgln("DidChangeFavicon: Received invalid favicon");
        return;
    }

    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_favicon_change)
            view->on_favicon_change(*favicon.bitmap());
    }
}

void WebContentClient::did_request_document_cookie_version_index(u64 page_id, i64 document_id, String domain)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (auto document_index = view->ensure_document_cookie_version_index({}, domain); !document_index.is_error())
            async_set_document_cookie_version_index(page_id, document_id, document_index.value());
    }
}

Messages::WebContentClient::DidRequestAllCookiesWebdriverResponse WebContentClient::did_request_all_cookies_webdriver(URL::URL url)
{
    return Application::cookie_jar().get_all_cookies_webdriver(url);
}

Messages::WebContentClient::DidRequestAllCookiesCookiestoreResponse WebContentClient::did_request_all_cookies_cookiestore(URL::URL url)
{
    return Application::cookie_jar().get_all_cookies_cookiestore(url);
}

Messages::WebContentClient::DidRequestNamedCookieResponse WebContentClient::did_request_named_cookie(URL::URL url, String name)
{
    return Application::cookie_jar().get_named_cookie(url, name);
}

Messages::WebContentClient::DidRequestCookieResponse WebContentClient::did_request_cookie(u64 page_id, URL::URL url, HTTP::Cookie::Source source)
{
    HTTP::Cookie::VersionedCookie cookie;
    cookie.cookie = Application::cookie_jar().get_cookie(url, source);

    if (source == HTTP::Cookie::Source::NonHttp) {
        if (auto view = view_for_page_id(page_id); view.has_value())
            cookie.cookie_version = view->document_cookie_version(url);
    }

    return cookie;
}

void WebContentClient::did_set_cookie(URL::URL url, HTTP::Cookie::ParsedCookie cookie, HTTP::Cookie::Source source)
{
    Application::cookie_jar().set_cookie(url, cookie, source);
}

void WebContentClient::did_update_cookie(HTTP::Cookie::Cookie cookie)
{
    Application::cookie_jar().update_cookie(cookie);
}

void WebContentClient::did_expire_cookies_with_time_offset(AK::Duration offset)
{
    Application::cookie_jar().expire_cookies_with_time_offset(offset);
}

Messages::WebContentClient::DidRequestStorageItemResponse WebContentClient::did_request_storage_item(Web::StorageAPI::StorageEndpointType storage_endpoint, String storage_key, String bottle_key)
{
    return Application::storage_jar().get_item(storage_endpoint, storage_key, bottle_key);
}

Messages::WebContentClient::DidSetStorageItemResponse WebContentClient::did_set_storage_item(Web::StorageAPI::StorageEndpointType storage_endpoint, String storage_key, String bottle_key, String value)
{
    return Application::storage_jar().set_item(storage_endpoint, storage_key, bottle_key, value);
}

void WebContentClient::did_remove_storage_item(Web::StorageAPI::StorageEndpointType storage_endpoint, String storage_key, String bottle_key)
{
    Application::storage_jar().remove_item(storage_endpoint, storage_key, bottle_key);
}

Messages::WebContentClient::DidRequestStorageKeysResponse WebContentClient::did_request_storage_keys(Web::StorageAPI::StorageEndpointType storage_endpoint, String storage_key)
{
    return Application::storage_jar().get_all_keys(storage_endpoint, storage_key);
}

void WebContentClient::did_clear_storage(Web::StorageAPI::StorageEndpointType storage_endpoint, String storage_key)
{
    Application::storage_jar().clear_storage_key(storage_endpoint, storage_key);
}

Messages::WebContentClient::DidRequestNewWebViewResponse WebContentClient::did_request_new_web_view(u64 page_id, Web::HTML::ActivateTab activate_tab, Web::HTML::WebViewHints hints, Optional<u64> page_index)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_new_web_view)
            return view->on_new_web_view(activate_tab, hints, page_index);
    }

    return String {};
}

void WebContentClient::did_request_activate_tab(u64 page_id)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_activate_tab)
            view->on_activate_tab();
    }
}

void WebContentClient::did_close_browsing_context(u64 page_id)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_close)
            view->on_close();
    }
}

void WebContentClient::did_update_resource_count(u64 page_id, i32 count_waiting)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_resource_status_change)
            view->on_resource_status_change(count_waiting);
    }
}

void WebContentClient::did_request_restore_window(u64 page_id)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_restore_window)
            view->on_restore_window();
    }
}

void WebContentClient::did_request_reposition_window(u64 page_id, Gfx::IntPoint position)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_reposition_window)
            view->on_reposition_window(position);
    }
}

void WebContentClient::did_request_resize_window(u64 page_id, Gfx::IntSize size)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_resize_window)
            view->on_resize_window(size);
    }
}

void WebContentClient::did_request_maximize_window(u64 page_id)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_maximize_window)
            view->on_maximize_window();
    }
}

void WebContentClient::did_request_minimize_window(u64 page_id)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_minimize_window)
            view->on_minimize_window();
    }
}

Messages::WebContentClient::DidRequestFullscreenWindowResponse WebContentClient::did_request_fullscreen_window(u64 page_id)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_fullscreen_window)
            view->on_fullscreen_window();
    }
    return true;
}

void WebContentClient::did_request_exit_fullscreen(u64 page_id)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_exit_fullscreen_window)
            view->on_exit_fullscreen_window();
    }
}

void WebContentClient::did_request_file(u64 page_id, ByteString path, i32 request_id)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_request_file)
            view->on_request_file(path, request_id);
    }
}

void WebContentClient::did_request_color_picker(u64 page_id, Color current_color)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_request_color_picker)
            view->on_request_color_picker(current_color);
    }
}

void WebContentClient::did_request_file_picker(u64 page_id, Web::HTML::FileFilter accepted_file_types, Web::HTML::AllowMultipleFiles allow_multiple_files)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_request_file_picker)
            view->on_request_file_picker(accepted_file_types, allow_multiple_files);
    }
}

void WebContentClient::did_request_select_dropdown(u64 page_id, Gfx::IntPoint content_position, i32 minimum_width, Vector<Web::HTML::SelectItem> items)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_request_select_dropdown)
            view->on_request_select_dropdown(view->to_widget_position(content_position), minimum_width / view->device_pixel_ratio(), items);
    }
}

void WebContentClient::did_finish_handling_input_event(u64 page_id, Web::EventResult event_result)
{
    if (auto view = view_for_page_id(page_id); view.has_value())
        view->did_finish_handling_input_event({}, event_result);
}

void WebContentClient::did_change_theme_color(u64 page_id, Gfx::Color color)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        if (view->on_theme_color_change)
            view->on_theme_color_change(color);
    }
}

void WebContentClient::did_insert_clipboard_entry(u64, Web::Clipboard::SystemClipboardRepresentation entry, String)
{
    Application::the().insert_clipboard_entry(move(entry));
}

void WebContentClient::did_request_clipboard_entries(u64 page_id, u64 request_id)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        Vector<Web::Clipboard::SystemClipboardItem> items;
        if (auto entries = Application::the().clipboard_entries(); !entries.is_empty())
            items.empend(move(entries));

        view->retrieved_clipboard_entries(request_id, items);
    }
}

void WebContentClient::did_change_audio_play_state(u64 page_id, Web::HTML::AudioPlayState play_state)
{
    if (auto view = view_for_page_id(page_id); view.has_value())
        view->did_change_audio_play_state({}, play_state);
}

void WebContentClient::did_update_navigation_buttons_state(u64 page_id, bool back_enabled, bool forward_enabled)
{
    if (auto view = view_for_page_id(page_id); view.has_value())
        view->did_update_navigation_buttons_state({}, back_enabled, forward_enabled);
}

void WebContentClient::did_allocate_backing_stores(u64 page_id, i32 front_bitmap_id, Gfx::ShareableBitmap front_bitmap, i32 back_bitmap_id, Gfx::ShareableBitmap back_bitmap)
{
    if (auto view = view_for_page_id(page_id); view.has_value())
        view->did_allocate_backing_stores({}, front_bitmap_id, front_bitmap, back_bitmap_id, back_bitmap);
}

Messages::WebContentClient::RequestWorkerAgentResponse WebContentClient::request_worker_agent(u64 page_id, Web::Bindings::AgentType worker_type)
{
    if (auto view = view_for_page_id(page_id); view.has_value()) {
        auto request_server_handle = MUST(connect_new_request_server_client());
        auto image_decoder_handle = MUST(connect_new_image_decoder_client());
        auto worker_client = MUST(WebView::launch_web_worker_process(worker_type));
        auto worker_handle = MUST(worker_client->transport().release_for_transfer());
        return { move(worker_handle), move(request_server_handle), move(image_decoder_handle) };
    }

    return { IPC::TransportHandle {}, IPC::TransportHandle {}, IPC::TransportHandle {} };
}

Optional<ViewImplementation&> WebContentClient::view_for_page_id(u64 page_id, SourceLocation location)
{
    // Don't bother logging anything for the spare WebContent process. It will only receive a load notification for about:blank.
    if (m_views.is_empty())
        return {};

    if (auto view = m_views.get(page_id); view.has_value())
        return *view.value();

    dbgln("WebContentClient::{}: Did not find a page with ID {}", location.function_name(), page_id);
    return {};
}

}