d612ca1fcc
We now look at the Content-Type HTTP header when deciding how to render some loaded content. If there is no Content-Type header (which will always be the case when loading local files, for example), we make a guess based on the URL filename.
637 lines
22 KiB
C++
637 lines
22 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/FileSystemPath.h>
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#include <AK/URL.h>
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#include <LibCore/File.h>
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#include <LibCore/MimeData.h>
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#include <LibGUI/Application.h>
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#include <LibGUI/Painter.h>
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#include <LibGUI/ScrollBar.h>
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#include <LibGUI/Window.h>
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#include <LibGfx/ImageDecoder.h>
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#include <LibJS/Runtime/Value.h>
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#include <LibMarkdown/Document.h>
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#include <LibWeb/DOM/Element.h>
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#include <LibWeb/DOM/ElementFactory.h>
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#include <LibWeb/DOM/HTMLAnchorElement.h>
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#include <LibWeb/DOM/HTMLImageElement.h>
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#include <LibWeb/DOM/MouseEvent.h>
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#include <LibWeb/DOM/Text.h>
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#include <LibWeb/Dump.h>
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#include <LibWeb/Frame.h>
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#include <LibWeb/HtmlView.h>
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#include <LibWeb/Layout/LayoutDocument.h>
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#include <LibWeb/Layout/LayoutNode.h>
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#include <LibWeb/Parser/HTMLParser.h>
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#include <LibWeb/RenderingContext.h>
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#include <LibWeb/ResourceLoader.h>
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#include <stdio.h>
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//#define SELECTION_DEBUG
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namespace Web {
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HtmlView::HtmlView()
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: m_main_frame(Web::Frame::create(*this))
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{
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main_frame().on_set_needs_display = [this](auto& content_rect) {
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if (content_rect.is_empty()) {
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update();
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return;
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}
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Gfx::Rect adjusted_rect = content_rect;
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adjusted_rect.set_location(to_widget_position(content_rect.location()));
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update(adjusted_rect);
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};
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set_should_hide_unnecessary_scrollbars(true);
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set_background_role(ColorRole::Base);
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}
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HtmlView::~HtmlView()
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{
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}
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void HtmlView::set_document(Document* new_document)
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{
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RefPtr<Document> old_document = document();
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if (new_document == old_document)
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return;
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if (old_document)
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old_document->on_layout_updated = nullptr;
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main_frame().set_document(new_document);
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if (new_document) {
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new_document->on_layout_updated = [this] {
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layout_and_sync_size();
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update();
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};
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}
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#ifdef HTML_DEBUG
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if (document != nullptr) {
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dbgprintf("\033[33;1mLayout tree before layout:\033[0m\n");
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::dump_tree(*layout_root());
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}
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#endif
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layout_and_sync_size();
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update();
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}
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void HtmlView::layout_and_sync_size()
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{
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if (!document())
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return;
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bool had_vertical_scrollbar = vertical_scrollbar().is_visible();
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bool had_horizontal_scrollbar = horizontal_scrollbar().is_visible();
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main_frame().set_size(available_size());
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document()->layout();
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set_content_size(enclosing_int_rect(layout_root()->rect()).size());
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// NOTE: If layout caused us to gain or lose scrollbars, we have to lay out again
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// since the scrollbars now take up some of the available space.
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if (had_vertical_scrollbar != vertical_scrollbar().is_visible() || had_horizontal_scrollbar != horizontal_scrollbar().is_visible()) {
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main_frame().set_size(available_size());
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document()->layout();
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set_content_size(enclosing_int_rect(layout_root()->rect()).size());
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}
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main_frame().set_viewport_rect(viewport_rect_in_content_coordinates());
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#ifdef HTML_DEBUG
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dbgprintf("\033[33;1mLayout tree after layout:\033[0m\n");
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::dump_tree(*layout_root());
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#endif
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}
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void HtmlView::resize_event(GUI::ResizeEvent& event)
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{
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GUI::ScrollableWidget::resize_event(event);
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layout_and_sync_size();
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}
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void HtmlView::paint_event(GUI::PaintEvent& event)
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{
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GUI::Frame::paint_event(event);
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GUI::Painter painter(*this);
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painter.add_clip_rect(widget_inner_rect());
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painter.add_clip_rect(event.rect());
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if (!layout_root()) {
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painter.fill_rect(event.rect(), palette().color(background_role()));
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return;
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}
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painter.fill_rect(event.rect(), document()->background_color(palette()));
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if (auto background_bitmap = document()->background_image()) {
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painter.draw_tiled_bitmap(event.rect(), *background_bitmap);
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}
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painter.translate(frame_thickness(), frame_thickness());
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painter.translate(-horizontal_scrollbar().value(), -vertical_scrollbar().value());
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RenderingContext context(painter, palette());
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context.set_should_show_line_box_borders(m_should_show_line_box_borders);
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context.set_viewport_rect(viewport_rect_in_content_coordinates());
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layout_root()->render(context);
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}
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void HtmlView::mousemove_event(GUI::MouseEvent& event)
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{
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if (!layout_root())
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return GUI::ScrollableWidget::mousemove_event(event);
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bool hovered_node_changed = false;
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bool is_hovering_link = false;
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bool was_hovering_link = document()->hovered_node() && document()->hovered_node()->is_link();
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auto result = layout_root()->hit_test(to_content_position(event.position()));
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const HTMLAnchorElement* hovered_link_element = nullptr;
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if (result.layout_node) {
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RefPtr<Node> node = result.layout_node->node();
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hovered_node_changed = node != document()->hovered_node();
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document()->set_hovered_node(node);
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if (node) {
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hovered_link_element = node->enclosing_link_element();
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if (hovered_link_element) {
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#ifdef HTML_DEBUG
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dbg() << "HtmlView: hovering over a link to " << hovered_link_element->href();
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#endif
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is_hovering_link = true;
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}
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auto offset = compute_mouse_event_offset(event.position(), *result.layout_node);
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node->dispatch_event(MouseEvent::create("mousemove", offset.x(), offset.y()));
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}
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if (m_in_mouse_selection) {
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layout_root()->selection().set_end({ result.layout_node, result.index_in_node });
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dump_selection("MouseMove");
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update();
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}
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}
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if (window())
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window()->set_override_cursor(is_hovering_link ? GUI::StandardCursor::Hand : GUI::StandardCursor::None);
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if (hovered_node_changed) {
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update();
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RefPtr<HTMLElement> hovered_html_element = document()->hovered_node() ? document()->hovered_node()->enclosing_html_element() : nullptr;
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if (hovered_html_element && !hovered_html_element->title().is_null()) {
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auto screen_position = screen_relative_rect().location().translated(event.position());
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GUI::Application::the().show_tooltip(hovered_html_element->title(), screen_position.translated(4, 4));
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} else {
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GUI::Application::the().hide_tooltip();
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}
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}
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if (is_hovering_link != was_hovering_link) {
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if (on_link_hover) {
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on_link_hover(hovered_link_element ? document()->complete_url(hovered_link_element->href()).to_string() : String());
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}
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}
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event.accept();
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}
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void HtmlView::mousedown_event(GUI::MouseEvent& event)
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{
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if (!layout_root())
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return GUI::ScrollableWidget::mousemove_event(event);
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bool hovered_node_changed = false;
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auto result = layout_root()->hit_test(to_content_position(event.position()));
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if (result.layout_node) {
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RefPtr<Node> node = result.layout_node->node();
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hovered_node_changed = node != document()->hovered_node();
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document()->set_hovered_node(node);
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if (node) {
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auto offset = compute_mouse_event_offset(event.position(), *result.layout_node);
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node->dispatch_event(MouseEvent::create("mousedown", offset.x(), offset.y()));
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if (RefPtr<HTMLAnchorElement> link = node->enclosing_link_element()) {
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dbg() << "HtmlView: clicking on a link to " << link->href();
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if (event.button() == GUI::MouseButton::Left) {
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if (link->href().starts_with("javascript:")) {
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run_javascript_url(link->href());
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} else {
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if (on_link_click)
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on_link_click(link->href(), link->target(), event.modifiers());
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}
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} else if (event.button() == GUI::MouseButton::Right) {
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if (on_link_context_menu_request)
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on_link_context_menu_request(link->href(), event.position().translated(screen_relative_rect().location()));
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} else if (event.button() == GUI::MouseButton::Middle) {
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if (on_link_middle_click)
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on_link_middle_click(link->href());
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}
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} else {
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if (event.button() == GUI::MouseButton::Left) {
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if (layout_root())
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layout_root()->selection().set({ result.layout_node, result.index_in_node }, {});
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dump_selection("MouseDown");
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m_in_mouse_selection = true;
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}
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}
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}
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}
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if (hovered_node_changed)
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update();
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event.accept();
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}
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void HtmlView::mouseup_event(GUI::MouseEvent& event)
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{
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if (!layout_root())
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return GUI::ScrollableWidget::mouseup_event(event);
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auto result = layout_root()->hit_test(to_content_position(event.position()));
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if (result.layout_node) {
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if (RefPtr<Node> node = result.layout_node->node()) {
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auto offset = compute_mouse_event_offset(event.position(), *result.layout_node);
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node->dispatch_event(MouseEvent::create("mouseup", offset.x(), offset.y()));
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}
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}
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if (event.button() == GUI::MouseButton::Left) {
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dump_selection("MouseUp");
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m_in_mouse_selection = false;
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}
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}
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void HtmlView::keydown_event(GUI::KeyEvent& event)
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{
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if (event.modifiers() == 0) {
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switch (event.key()) {
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case Key_Home:
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vertical_scrollbar().set_value(0);
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break;
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case Key_End:
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vertical_scrollbar().set_value(vertical_scrollbar().max());
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break;
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case Key_Down:
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vertical_scrollbar().set_value(vertical_scrollbar().value() + vertical_scrollbar().step());
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break;
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case Key_Up:
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vertical_scrollbar().set_value(vertical_scrollbar().value() - vertical_scrollbar().step());
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break;
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case Key_Left:
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horizontal_scrollbar().set_value(horizontal_scrollbar().value() + horizontal_scrollbar().step());
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break;
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case Key_Right:
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horizontal_scrollbar().set_value(horizontal_scrollbar().value() - horizontal_scrollbar().step());
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break;
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case Key_PageDown:
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vertical_scrollbar().set_value(vertical_scrollbar().value() + frame_inner_rect().height());
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break;
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case Key_PageUp:
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vertical_scrollbar().set_value(vertical_scrollbar().value() - frame_inner_rect().height());
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break;
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}
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}
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event.accept();
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}
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void HtmlView::reload()
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{
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load(main_frame().document()->url());
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}
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static RefPtr<Document> create_markdown_document(const ByteBuffer& data, const URL& url)
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{
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Markdown::Document markdown_document;
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if (!markdown_document.parse(data))
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return nullptr;
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return parse_html_document(markdown_document.render_to_html(), url);
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}
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static RefPtr<Document> create_text_document(const ByteBuffer& data, const URL& url)
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{
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auto document = adopt(*new Document(url));
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auto html_element = document->create_element("html");
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document->append_child(html_element);
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auto head_element = document->create_element("head");
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html_element->append_child(head_element);
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auto title_element = document->create_element("title");
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head_element->append_child(title_element);
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auto title_text = document->create_text_node(url.basename());
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title_element->append_child(title_text);
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auto body_element = document->create_element("body");
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html_element->append_child(body_element);
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auto pre_element = create_element(document, "pre");
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body_element->append_child(pre_element);
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pre_element->append_child(document->create_text_node(String::copy(data)));
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return document;
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}
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static RefPtr<Document> create_image_document(const ByteBuffer& data, const URL& url)
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{
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auto document = adopt(*new Document(url));
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auto image_decoder = Gfx::ImageDecoder::create(data.data(), data.size());
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auto bitmap = image_decoder->bitmap();
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ASSERT(bitmap);
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auto html_element = create_element(document, "html");
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document->append_child(html_element);
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auto head_element = create_element(document, "head");
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html_element->append_child(head_element);
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auto title_element = create_element(document, "title");
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head_element->append_child(title_element);
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auto basename = FileSystemPath(url.path()).basename();
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auto title_text = adopt(*new Text(document, String::format("%s [%dx%d]", basename.characters(), bitmap->width(), bitmap->height())));
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title_element->append_child(title_text);
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auto body_element = create_element(document, "body");
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html_element->append_child(body_element);
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auto image_element = create_element(document, "img");
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image_element->set_attribute("src", url.to_string());
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body_element->append_child(image_element);
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return document;
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}
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String encoding_from_content_type(const String& content_type)
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{
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auto offset = content_type.index_of("charset=");
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if (offset.has_value())
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return content_type.substring(offset.value() + 8, content_type.length() - offset.value() - 8).to_lowercase();
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return "utf-8";
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}
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String mime_type_from_content_type(const String& content_type)
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{
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auto offset = content_type.index_of(";");
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if (offset.has_value())
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return content_type.substring(0, offset.value()).to_lowercase();
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return content_type;
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}
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static String guess_mime_type_based_on_filename(const URL& url)
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{
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if (url.path().ends_with(".png"))
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return "image/png";
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if (url.path().ends_with(".gif"))
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return "image/gif";
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if (url.path().ends_with(".md"))
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return "text/markdown";
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if (url.path().ends_with(".html") || url.path().ends_with(".htm"))
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return "text/html";
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return "text/plain";
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}
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static RefPtr<Document> create_document_from_mime_type(const ByteBuffer& data, const URL& url, const String& mime_type, const String& encoding)
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{
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if (mime_type.starts_with("image/"))
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return create_image_document(data, url);
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if (mime_type == "text/plain")
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return create_text_document(data, url);
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if (mime_type == "text/markdown")
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return create_markdown_document(data, url);
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if (mime_type == "text/html")
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return parse_html_document(data, url, encoding);
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return nullptr;
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}
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void HtmlView::load(const URL& url)
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{
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dbg() << "HtmlView::load: " << url.to_string();
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if (!url.is_valid()) {
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load_error_page(url, "Invalid URL");
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return;
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}
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if (window())
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window()->set_override_cursor(GUI::StandardCursor::None);
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if (on_load_start)
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on_load_start(url);
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ResourceLoader::the().load(
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url,
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[this, url](auto data, auto& response_headers) {
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// FIXME: Also check HTTP status code before redirecting
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auto location = response_headers.get("Location");
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if (location.has_value()) {
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load(location.value());
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return;
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}
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if (data.is_null()) {
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load_error_page(url, "No data");
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return;
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}
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String encoding = "utf-8";
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String mime_type;
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auto content_type = response_headers.get("Content-Type");
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if (content_type.has_value()) {
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dbg() << "Content-Type header: _" << content_type.value() << "_";
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encoding = encoding_from_content_type(content_type.value());
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mime_type = mime_type_from_content_type(content_type.value());
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} else {
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dbg() << "No Content-Type header to go on! Guessing based on filename...";
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mime_type = guess_mime_type_based_on_filename(url);
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}
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dbg() << "I believe this content has MIME type '" << mime_type << "', encoding '" << encoding << "'";
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auto document = create_document_from_mime_type(data, url, mime_type, encoding);
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ASSERT(document);
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set_document(document);
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if (on_title_change)
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on_title_change(document->title());
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},
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[this, url](auto error) {
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load_error_page(url, error);
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});
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if (url.protocol() != "file" && url.protocol() != "about") {
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URL favicon_url;
|
|
favicon_url.set_protocol(url.protocol());
|
|
favicon_url.set_host(url.host());
|
|
favicon_url.set_port(url.port());
|
|
favicon_url.set_path("/favicon.ico");
|
|
|
|
ResourceLoader::the().load(
|
|
favicon_url,
|
|
[this, favicon_url](auto data, auto&) {
|
|
dbg() << "Favicon downloaded, " << data.size() << " bytes from " << favicon_url.to_string();
|
|
auto decoder = Gfx::ImageDecoder::create(data.data(), data.size());
|
|
auto bitmap = decoder->bitmap();
|
|
if (!bitmap) {
|
|
dbg() << "Could not decode favicon " << favicon_url.to_string();
|
|
return;
|
|
}
|
|
dbg() << "Decoded favicon, " << bitmap->size();
|
|
if (on_favicon_change)
|
|
on_favicon_change(*bitmap);
|
|
});
|
|
}
|
|
|
|
this->scroll_to_top();
|
|
}
|
|
|
|
void HtmlView::load_error_page(const URL& failed_url, const String& error)
|
|
{
|
|
auto error_page_url = "file:///res/html/error.html";
|
|
ResourceLoader::the().load(
|
|
error_page_url,
|
|
[this, failed_url, error](auto data, auto&) {
|
|
ASSERT(!data.is_null());
|
|
auto html = String::format(
|
|
String::copy(data).characters(),
|
|
escape_html_entities(failed_url.to_string()).characters(),
|
|
escape_html_entities(error).characters());
|
|
auto document = parse_html_document(html, failed_url);
|
|
ASSERT(document);
|
|
set_document(document);
|
|
if (on_title_change)
|
|
on_title_change(document->title());
|
|
},
|
|
[](auto error) {
|
|
dbg() << "Failed to load error page: " << error;
|
|
ASSERT_NOT_REACHED();
|
|
});
|
|
}
|
|
|
|
const LayoutDocument* HtmlView::layout_root() const
|
|
{
|
|
return document() ? document()->layout_node() : nullptr;
|
|
}
|
|
|
|
LayoutDocument* HtmlView::layout_root()
|
|
{
|
|
if (!document())
|
|
return nullptr;
|
|
return const_cast<LayoutDocument*>(document()->layout_node());
|
|
}
|
|
|
|
void HtmlView::scroll_to_anchor(const StringView& name)
|
|
{
|
|
if (!document())
|
|
return;
|
|
|
|
const auto* element = document()->get_element_by_id(name);
|
|
if (!element) {
|
|
auto candidates = document()->get_elements_by_name(name);
|
|
for (auto* candidate : candidates) {
|
|
if (is<HTMLAnchorElement>(*candidate)) {
|
|
element = to<HTMLAnchorElement>(candidate);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!element) {
|
|
dbg() << "HtmlView::scroll_to_anchor(): Anchor not found: '" << name << "'";
|
|
return;
|
|
}
|
|
if (!element->layout_node()) {
|
|
dbg() << "HtmlView::scroll_to_anchor(): Anchor found but without layout node: '" << name << "'";
|
|
return;
|
|
}
|
|
auto& layout_node = *element->layout_node();
|
|
Gfx::FloatRect float_rect { layout_node.box_type_agnostic_position(), { (float)visible_content_rect().width(), (float)visible_content_rect().height() } };
|
|
scroll_into_view(enclosing_int_rect(float_rect), true, true);
|
|
window()->set_override_cursor(GUI::StandardCursor::None);
|
|
}
|
|
|
|
Document* HtmlView::document()
|
|
{
|
|
return main_frame().document();
|
|
}
|
|
|
|
const Document* HtmlView::document() const
|
|
{
|
|
return main_frame().document();
|
|
}
|
|
|
|
void HtmlView::dump_selection(const char* event_name)
|
|
{
|
|
UNUSED_PARAM(event_name);
|
|
#ifdef SELECTION_DEBUG
|
|
dbg() << event_name << " selection start: "
|
|
<< layout_root()->selection().start().layout_node << ":" << layout_root()->selection().start().index_in_node << ", end: "
|
|
<< layout_root()->selection().end().layout_node << ":" << layout_root()->selection().end().index_in_node;
|
|
#endif
|
|
}
|
|
|
|
void HtmlView::did_scroll()
|
|
{
|
|
main_frame().set_viewport_rect(viewport_rect_in_content_coordinates());
|
|
}
|
|
|
|
Gfx::Point HtmlView::compute_mouse_event_offset(const Gfx::Point& event_position, const LayoutNode& layout_node) const
|
|
{
|
|
auto content_event_position = to_content_position(event_position);
|
|
auto top_left_of_layout_node = layout_node.box_type_agnostic_position();
|
|
|
|
return {
|
|
content_event_position.x() - static_cast<int>(top_left_of_layout_node.x()),
|
|
content_event_position.y() - static_cast<int>(top_left_of_layout_node.y())
|
|
};
|
|
}
|
|
|
|
void HtmlView::run_javascript_url(const String& url)
|
|
{
|
|
ASSERT(url.starts_with("javascript:"));
|
|
if (!document())
|
|
return;
|
|
|
|
auto source = url.substring_view(11, url.length() - 11);
|
|
dbg() << "running js from url: _" << source << "_";
|
|
document()->run_javascript(source);
|
|
}
|
|
|
|
void HtmlView::drop_event(GUI::DropEvent& event)
|
|
{
|
|
if (event.mime_data().has_urls()) {
|
|
if (on_url_drop) {
|
|
on_url_drop(event.mime_data().urls().first());
|
|
return;
|
|
}
|
|
}
|
|
ScrollableWidget::drop_event(event);
|
|
}
|
|
|
|
}
|