2021-10-19 00:17:16 +02:00
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// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef CEF_LIBCEF_BROWSER_FRAME_SERVICE_BASE_H_
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#define CEF_LIBCEF_BROWSER_FRAME_SERVICE_BASE_H_
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#include <utility>
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#include "base/bind.h"
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#include "base/logging.h"
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#include "base/threading/thread_checker.h"
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#include "content/public/browser/navigation_handle.h"
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#include "content/public/browser/render_frame_host.h"
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#include "content/public/browser/web_contents.h"
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#include "content/public/browser/web_contents_observer.h"
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#include "mojo/public/cpp/bindings/pending_receiver.h"
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#include "mojo/public/cpp/bindings/receiver.h"
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#include "url/origin.h"
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namespace content {
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// Base class for mojo interface implementations tied to a document's lifetime.
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// The service will be destroyed when any of the following happens:
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// 1. mojo interface connection error happened,
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// 2. the RenderFrameHost was deleted, or
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// 3. navigation was committed on the RenderFrameHost (not same document) and
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// ShouldCloseOnFinishNavigation() returns true.
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//
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// WARNING: To avoid race conditions, subclasses MUST only get the origin via
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// origin() instead of from |render_frame_host| passed in the constructor.
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// See https://crbug.com/769189 for an example of such a race.
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//
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// Based on the old implementation of DocumentServiceBase that existed prior to
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// https://crrev.com/2809effa24. CEF requires the old implementation to support
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// bindings that outlive navigation.
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template <typename Interface>
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class FrameServiceBase : public Interface, public WebContentsObserver {
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public:
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FrameServiceBase(RenderFrameHost* render_frame_host,
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mojo::PendingReceiver<Interface> pending_receiver)
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: WebContentsObserver(
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WebContents::FromRenderFrameHost(render_frame_host)),
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render_frame_host_(render_frame_host),
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origin_(render_frame_host_->GetLastCommittedOrigin()),
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receiver_(this, std::move(pending_receiver)) {
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// |this| owns |receiver_|, so unretained is safe.
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receiver_.set_disconnect_handler(
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base::BindOnce(&FrameServiceBase::Close, base::Unretained(this)));
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}
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protected:
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// Make the destructor private since |this| can only be deleted by Close().
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virtual ~FrameServiceBase() = default;
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// All subclasses should use this function to obtain the origin instead of
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// trying to get it from the RenderFrameHost pointer directly.
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const url::Origin& origin() const { return origin_; }
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// Returns the RenderFrameHost held by this object.
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RenderFrameHost* render_frame_host() const { return render_frame_host_; }
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// Subclasses can use this to check thread safety.
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// For example: DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
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THREAD_CHECKER(thread_checker_);
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private:
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// Disallow calling web_contents() directly from the subclasses to ensure that
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// tab-level state doesn't get queried or updated when the RenderFrameHost is
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// not active.
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// Use WebContents::From(render_frame_host()) instead, but please keep in mind
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// that the render_frame_host() might not be active. See
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// RenderFrameHost::IsActive() for details.
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using WebContentsObserver::web_contents;
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// WebContentsObserver implementation.
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void RenderFrameDeleted(RenderFrameHost* render_frame_host) final {
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DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
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if (render_frame_host == render_frame_host_) {
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DVLOG(1) << __func__ << ": RenderFrame destroyed.";
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Close();
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}
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}
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void DidFinishNavigation(NavigationHandle* navigation_handle) final {
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DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
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if (!ShouldCloseOnFinishNavigation()) {
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return;
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}
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if (!navigation_handle->HasCommitted() ||
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navigation_handle->IsSameDocument() ||
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navigation_handle->IsPageActivation()) {
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return;
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}
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if (navigation_handle->GetRenderFrameHost() == render_frame_host_) {
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// FrameServiceBase is destroyed either when RenderFrameHost is
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// destroyed (covered by RenderFrameDeleted) or when a new document
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// commits in the same RenderFrameHost (covered by DidFinishNavigation).
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// Only committed non-same-document non-bfcache non-prerendering
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// activation navigations replace a document in existing RenderFrameHost.
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DVLOG(1) << __func__ << ": Close connection on navigation.";
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Close();
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}
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}
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// Used for CEF bindings that outlive navigation.
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virtual bool ShouldCloseOnFinishNavigation() const { return true; }
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// Stops observing WebContents and delete |this|.
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void Close() {
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DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
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DVLOG(1) << __func__;
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delete this;
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}
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RenderFrameHost* const render_frame_host_ = nullptr;
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const url::Origin origin_;
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mojo::Receiver<Interface> receiver_;
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};
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} // namespace content
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#endif // CEF_LIBCEF_BROWSER_FRAME_SERVICE_BASE_H_
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