content/browser/browsing_topics/browsing_topics_document_host.cc

// Copyright 2022 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/browsing_topics/browsing_topics_document_host.h"

#include "base/bind.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/document_service.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/web_contents.h"
#include "content/public/common/content_client.h"
#include "third_party/blink/public/mojom/browsing_topics/browsing_topics.mojom.h"

namespace content {

BrowsingTopicsDocumentHost::BrowsingTopicsDocumentHost(
    RenderFrameHost& render_frame_host,
    mojo::PendingReceiver<blink::mojom::BrowsingTopicsDocumentService> receiver)
    : DocumentService(render_frame_host, std::move(receiver)) {}

// static
void BrowsingTopicsDocumentHost::CreateMojoService(
    RenderFrameHost* render_frame_host,
    mojo::PendingReceiver<blink::mojom::BrowsingTopicsDocumentService>
        receiver) {
  CHECK(render_frame_host);

  if (render_frame_host->GetLastCommittedOrigin().opaque()) {
    mojo::ReportBadMessage(
        "Unexpected BrowsingTopicsDocumentHost::CreateMojoService in an opaque "
        "origin document.");
    return;
  }

  if (render_frame_host->IsNestedWithinFencedFrame()) {
    mojo::ReportBadMessage(
        "Unexpected BrowsingTopicsDocumentHost::CreateMojoService in a fenced "
        "frame.");
    return;
  }

  if (render_frame_host->GetLifecycleState() ==
      RenderFrameHost::LifecycleState::kPrerendering) {
    mojo::ReportBadMessage(
        "Unexpected BrowsingTopicsDocumentHost::CreateMojoService when the "
        "page is being prerendered.");
    return;
  }

  // We do not check for portals here and we check at the API entry points
  // because whether or not a frame is in a portal is dynamic state that could
  // change.

  // The object is bound to the lifetime of |render_frame_host| and the mojo
  // connection. See DocumentService for details.
  new BrowsingTopicsDocumentHost(*render_frame_host, std::move(receiver));
}

void BrowsingTopicsDocumentHost::GetBrowsingTopics(
    GetBrowsingTopicsCallback callback) {
  // IPCs may race with navigation events, so:
  // - Ignore non-active frames, e.g. a frame placed into bfcache, or a
  //   frame that has been detached (this could happen as a result of
  //   cross-process races when navigating).
  if (!render_frame_host().IsActive() ||
      // Ignore non-primary frames, e.g. frames in a portal. Fenced frames and
      // prerendered pages are also covered in this condition but they should
      // have already been checked in `CreateMojoService()`.
      !render_frame_host().GetPage().IsPrimary() ||
      // TODO(crbug.com/1244137): IsPrimary() doesn't actually detect portals
      // yet. Remove this when it does.
      render_frame_host().GetOutermostMainFrame() !=
          render_frame_host().GetMainFrame()) {
    std::move(callback).Run(
        blink::mojom::GetBrowsingTopicsResult::NewErrorMessage(
            "document.browsingTopics() is only allowed in the outermost page "
            "and when the page is active."));
    return;
  }

  std::move(callback).Run(
      blink::mojom::GetBrowsingTopicsResult::NewBrowsingTopics(
          GetContentClient()->browser()->GetBrowsingTopicsForJsApi(
              render_frame_host().GetLastCommittedOrigin(),
              render_frame_host().GetMainFrame())));
}

BrowsingTopicsDocumentHost::~BrowsingTopicsDocumentHost() = default;

}  // namespace content