content/browser/renderer_host/page_impl.cc

// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/renderer_host/page_impl.h"

#include "base/barrier_closure.h"
#include "base/feature_list.h"
#include "base/i18n/character_encoding.h"
#include "base/trace_event/optional_trace_event.h"
#include "cc/base/features.h"
#include "content/browser/manifest/manifest_manager_host.h"
#include "content/browser/renderer_host/frame_tree_node.h"
#include "content/browser/renderer_host/page_delegate.h"
#include "content/browser/renderer_host/render_frame_host_delegate.h"
#include "content/browser/renderer_host/render_frame_host_impl.h"
#include "content/browser/renderer_host/render_frame_proxy_host.h"
#include "content/browser/renderer_host/render_view_host_delegate.h"
#include "content/browser/renderer_host/render_view_host_impl.h"
#include "content/public/browser/render_view_host.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/public/common/loader/loader_constants.h"
#include "third_party/blink/public/mojom/manifest/manifest.mojom.h"
#include "third_party/perfetto/include/perfetto/tracing/traced_value.h"

namespace content {

PageImpl::PageImpl(RenderFrameHostImpl& rfh, PageDelegate& delegate)
    : main_document_(rfh),
      delegate_(delegate),
      text_autosizer_page_info_({0, 0, 1.f}) {
  if (base::FeatureList::IsEnabled(
          blink::features::kSharedStorageReportEventLimit)) {
    select_url_report_event_budget_ = static_cast<double>(
        blink::features::kSharedStorageReportEventBitBudgetPerPageLoad.Get());
  }
}

PageImpl::~PageImpl() {
  // As SupportsUserData is a base class of PageImpl, Page members will be
  // destroyed before running ~SupportsUserData, which would delete the
  // associated PageUserData objects. Avoid this by calling ClearAllUserData
  // explicitly here to ensure that the PageUserData destructors can access
  // associated Page object.
  ClearAllUserData();
}

const absl::optional<GURL>& PageImpl::GetManifestUrl() const {
  return manifest_url_;
}

void PageImpl::GetManifest(GetManifestCallback callback) {
  ManifestManagerHost* manifest_manager_host =
      ManifestManagerHost::GetOrCreateForPage(*this);
  manifest_manager_host->GetManifest(std::move(callback));
}

bool PageImpl::IsPrimary() const {
  // TODO(1244137): Check for portals as well, once they are migrated to MPArch.
  if (main_document_->IsFencedFrameRoot())
    return false;

  return main_document_->lifecycle_state() ==
         RenderFrameHostImpl::LifecycleStateImpl::kActive;
}

void PageImpl::UpdateManifestUrl(const GURL& manifest_url) {
  manifest_url_ = manifest_url;

  // If |main_document_| is not active, the notification is sent on the page
  // activation.
  if (!main_document_->IsActive())
    return;

  main_document_->delegate()->OnManifestUrlChanged(*this);
}

void PageImpl::WriteIntoTrace(perfetto::TracedValue context) {
  auto dict = std::move(context).WriteDictionary();
  dict.Add("main_document", *main_document_);
}

base::WeakPtr<Page> PageImpl::GetWeakPtr() {
  return weak_factory_.GetWeakPtr();
}

base::WeakPtr<PageImpl> PageImpl::GetWeakPtrImpl() {
  return weak_factory_.GetWeakPtr();
}

bool PageImpl::IsPageScaleFactorOne() {
  return GetPageScaleFactor() == 1.f;
}

void PageImpl::OnFirstVisuallyNonEmptyPaint() {
  did_first_visually_non_empty_paint_ = true;
  delegate_->OnFirstVisuallyNonEmptyPaint(*this);
}

void PageImpl::OnThemeColorChanged(const absl::optional<SkColor>& theme_color) {
  main_document_theme_color_ = theme_color;
  delegate_->OnThemeColorChanged(*this);
}

void PageImpl::DidChangeBackgroundColor(SkColor background_color,
                                        bool color_adjust) {
  main_document_background_color_ = background_color;
  delegate_->OnBackgroundColorChanged(*this);
  if (color_adjust) {
    // <meta name="color-scheme" content="dark"> may pass the dark canvas
    // background before the first paint in order to avoid flashing the white
    // background in between loading documents. If we perform a navigation
    // within the same renderer process, we keep the content background from the
    // previous page while rendering is blocked in the new page, but for cross
    // process navigations we would paint the default background (typically
    // white) while the rendering is blocked.
    main_document_->GetRenderWidgetHost()->GetView()->SetContentBackgroundColor(
        background_color);
  }
}

void PageImpl::DidInferColorScheme(
    blink::mojom::PreferredColorScheme color_scheme) {
  main_document_inferred_color_scheme_ = color_scheme;
  delegate_->DidInferColorScheme(*this);
}

void PageImpl::NotifyPageBecameCurrent() {
  if (!IsPrimary())
    return;
  delegate_->NotifyPageBecamePrimary(*this);
}

void PageImpl::SetContentsMimeType(std::string mime_type) {
  contents_mime_type_ = std::move(mime_type);
}

void PageImpl::OnTextAutosizerPageInfoChanged(
    blink::mojom::TextAutosizerPageInfoPtr page_info) {
  OPTIONAL_TRACE_EVENT0("content", "PageImpl::OnTextAutosizerPageInfoChanged");

  // Keep a copy of `page_info` in case we create a new `blink::WebView` before
  // the next update, so that the PageImpl can tell the newly created
  // `blink::WebView` about the autosizer info.
  text_autosizer_page_info_.main_frame_width = page_info->main_frame_width;
  text_autosizer_page_info_.main_frame_layout_width =
      page_info->main_frame_layout_width;
  text_autosizer_page_info_.device_scale_adjustment =
      page_info->device_scale_adjustment;

  auto remote_frames_broadcast_callback = base::BindRepeating(
      [](const blink::mojom::TextAutosizerPageInfo& page_info,
         RenderFrameProxyHost* proxy_host) {
        DCHECK(proxy_host);
        proxy_host->GetAssociatedRemoteMainFrame()->UpdateTextAutosizerPageInfo(
            page_info.Clone());
      },
      text_autosizer_page_info_);

  main_document_->frame_tree()
      ->root()
      ->render_manager()
      ->ExecuteRemoteFramesBroadcastMethod(
          std::move(remote_frames_broadcast_callback),
          main_document_->GetSiteInstance());
}

void PageImpl::SetActivationStartTime(base::TimeTicks activation_start) {
  DCHECK(!activation_start_time_for_prerendering_);
  activation_start_time_for_prerendering_ = activation_start;
}

void PageImpl::ActivateForPrerendering(
    StoredPage::RenderViewHostImplSafeRefSet& render_view_hosts,
    absl::optional<blink::ViewTransitionState> view_transition_state) {
  base::OnceClosure did_activate_render_views =
      base::BindOnce(&PageImpl::DidActivateAllRenderViewsForPrerendering,
                     weak_factory_.GetWeakPtr());

  base::RepeatingClosure barrier = base::BarrierClosure(
      render_view_hosts.size(), std::move(did_activate_render_views));
  for (const auto& rvh : render_view_hosts) {
    auto params = blink::mojom::PrerenderPageActivationParams::New();

    // Only send navigation_start to the RenderViewHost for the main frame to
    // avoid sending the info cross-origin. Only this RenderViewHost needs the
    // info, as we expect the other RenderViewHosts are made for cross-origin
    // iframes which have not yet loaded their document. To the renderer, it
    // just looks like an ongoing navigation is happening in the frame and has
    // not yet committed. These RenderViews still need to know about activation
    // so their documents are created in the non-prerendered state once their
    // navigation is committed.
    if (main_document_->GetRenderViewHost() == &*rvh) {
      params->activation_start = *activation_start_time_for_prerendering_;
      params->view_transition_state = std::move(view_transition_state);
    }

    params->was_user_activated =
        main_document_->frame_tree_node()
                ->has_received_user_gesture_before_nav()
            ? blink::mojom::WasActivatedOption::kYes
            : blink::mojom::WasActivatedOption::kNo;
    rvh->ActivatePrerenderedPage(std::move(params), barrier);
  }

  // Prepare each RenderFrameHostImpl in this Page for activation.
  // TODO(https://crbug.com/1232528): Currently we check GetPage() below because
  // RenderFrameHostImpls may be in a different Page, if, e.g., they are in an
  // inner WebContents. These are in a different FrameTree which might not know
  // it is being prerendered. We should teach these FrameTrees that they are
  // being prerendered, or ban inner FrameTrees in a prerendering page.
  main_document_->ForEachRenderFrameHostIncludingSpeculative(
      [this](RenderFrameHostImpl* rfh) {
        if (&rfh->GetPage() != this)
          return;
        rfh->RendererWillActivateForPrerendering();
      });
}

void PageImpl::MaybeDispatchLoadEventsOnPrerenderActivation() {
  DCHECK(IsPrimary());

  // Dispatch LoadProgressChanged notification on activation with the
  // prerender last load progress value if the value is not equal to
  // blink::kFinalLoadProgress, whose notification is dispatched during call
  // to DidStopLoading.
  if (load_progress() != blink::kFinalLoadProgress)
    main_document_->DidChangeLoadProgress(load_progress());

  // Dispatch PrimaryMainDocumentElementAvailable before dispatching following
  // load complete events.
  if (is_main_document_element_available())
    main_document_->MainDocumentElementAvailable(uses_temporary_zoom_level());

  main_document_->ForEachRenderFrameHost(
      &RenderFrameHostImpl::MaybeDispatchDOMContentLoadedOnPrerenderActivation);

  if (is_on_load_completed_in_main_document())
    main_document_->DocumentOnLoadCompleted();

  main_document_->ForEachRenderFrameHost(
      &RenderFrameHostImpl::MaybeDispatchDidFinishLoadOnPrerenderActivation);
}

void PageImpl::DidActivateAllRenderViewsForPrerendering() {
  // Tell each RenderFrameHostImpl in this Page that activation finished.
  main_document_->ForEachRenderFrameHost([this](RenderFrameHostImpl* rfh) {
    if (&rfh->GetPage() != this)
      return;
    rfh->RendererDidActivateForPrerendering();
  });
}

RenderFrameHost& PageImpl::GetMainDocumentHelper() {
  return *main_document_;
}

RenderFrameHostImpl& PageImpl::GetMainDocument() const {
  return *main_document_;
}

void PageImpl::UpdateBrowserControlsState(cc::BrowserControlsState constraints,
                                          cc::BrowserControlsState current,
                                          bool animate) {
  // TODO(https://crbug.com/1154852): Asking for the LocalMainFrame interface
  // before the RenderFrame is created is racy.
  if (!GetMainDocument().IsRenderFrameLive())
    return;

  if (base::FeatureList::IsEnabled(
          features::kUpdateBrowserControlsWithoutProxy)) {
    GetMainDocument().GetRenderWidgetHost()->UpdateBrowserControlsState(
        constraints, current, animate);
  } else {
    GetMainDocument().GetAssociatedLocalMainFrame()->UpdateBrowserControlsState(
        constraints, current, animate);
  }
}

float PageImpl::GetPageScaleFactor() const {
  return GetMainDocument().GetPageScaleFactor();
}

void PageImpl::UpdateEncoding(const std::string& encoding_name) {
  if (encoding_name == last_reported_encoding_)
    return;
  last_reported_encoding_ = encoding_name;

  canonical_encoding_ =
      base::GetCanonicalEncodingNameByAliasName(encoding_name);
}

void PageImpl::NotifyVirtualKeyboardOverlayRect(
    const gfx::Rect& keyboard_rect) {
  // TODO(https://crbug.com/1317002): send notification to outer frames if
  // needed.
  DCHECK_EQ(virtual_keyboard_mode(),
            ui::mojom::VirtualKeyboardMode::kOverlaysContent);
  GetMainDocument().GetAssociatedLocalFrame()->NotifyVirtualKeyboardOverlayRect(
      keyboard_rect);
}

void PageImpl::SetVirtualKeyboardMode(ui::mojom::VirtualKeyboardMode mode) {
  if (virtual_keyboard_mode_ == mode)
    return;

  virtual_keyboard_mode_ = mode;

  delegate_->OnVirtualKeyboardModeChanged(*this);
}

base::flat_map<std::string, std::string> PageImpl::GetKeyboardLayoutMap() {
  return GetMainDocument().GetRenderWidgetHost()->GetKeyboardLayoutMap();
}

bool PageImpl::IsSelectURLAllowed(const url::Origin& origin) {
  if (!base::FeatureList::IsEnabled(
          blink::features::kSharedStorageSelectURLLimit)) {
    return true;
  }

  int& count = select_url_count_[origin];
  if (count >=
      blink::features::
          kSharedStorageMaxAllowedSelectURLCallsPerOriginPerPageLoad.Get()) {
    return false;
  }

  ++count;
  return true;
}

bool PageImpl::CheckAndMaybeDebitReportEventForSelectURLBudget(
    RenderFrameHost& rfh) {
  if (!select_url_report_event_budget_.has_value()) {
    // `blink::features::kSharedStorageReportEventLimit` is disabled.
    return true;
  }

  std::vector<const SharedStorageBudgetMetadata*> metadata_vector =
      static_cast<RenderFrameHostImpl&>(rfh)
          .frame_tree_node()
          ->FindSharedStorageBudgetMetadata();

  // Get the total charge.
  double total_to_charge = 0;
  for (const auto* metadata : metadata_vector) {
    if (metadata->report_event_called) {
      // The bits have already been charged for this URN.
      continue;
    }

    total_to_charge += metadata->budget_to_charge;
  }

  if (total_to_charge > select_url_report_event_budget_.value()) {
    // There is insufficient budget remaining.
    return false;
  }

  // Set flag(s) that `reportEvent()` has now been called.
  for (const auto* metadata : metadata_vector) {
    if (metadata->report_event_called) {
      // The bits have already been charged for this URN.
      continue;
    }

    metadata->report_event_called = true;
  }

  // There is sufficient budget, so charge the total now.
  select_url_report_event_budget_.value() -= total_to_charge;
  return true;
}

}  // namespace content