third_party/blink/renderer/core/loader/private/prerender_handle.cc

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
 * met:
 *
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 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "third_party/blink/renderer/core/loader/private/prerender_handle.h"

#include "services/network/public/mojom/referrer_policy.mojom-blink.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/loader/frame_loader.h"
#include "third_party/blink/renderer/core/loader/prerenderer_client.h"
#include "third_party/blink/renderer/platform/heap/heap.h"
#include "third_party/blink/renderer/platform/prerender.h"
#include "third_party/blink/renderer/platform/weborigin/security_policy.h"

namespace blink {

// static
PrerenderHandle* PrerenderHandle::Create(Document& document,
                                         PrerenderClient* client,
                                         const KURL& url,
                                         const unsigned prerender_rel_types) {
  // Prerenders are unlike requests in most ways (for instance, they pass down
  // fragments, and they don't return data), but they do have referrers.
  if (!document.GetFrame())
    return nullptr;

  auto* prerender = MakeGarbageCollected<Prerender>(
      client, url, prerender_rel_types,
      SecurityPolicy::GenerateReferrer(document.GetReferrerPolicy(), url,
                                       document.OutgoingReferrer()),
      document.GetSecurityOrigin());

  PrerendererClient* prerenderer_client =
      PrerendererClient::From(document.GetPage());
  if (prerenderer_client)
    prerenderer_client->WillAddPrerender(prerender);
  prerender->Add();

  return MakeGarbageCollected<PrerenderHandle>(document, prerender);
}

PrerenderHandle::PrerenderHandle(Document& document, Prerender* prerender)
    : ContextLifecycleObserver(&document), prerender_(prerender) {}

PrerenderHandle::~PrerenderHandle() = default;

void PrerenderHandle::Dispose() {
  if (prerender_) {
    prerender_->Abandon();
    Detach();
  }
}

void PrerenderHandle::Cancel() {
  // Avoid both abandoning and canceling the same prerender. In the abandon
  // case, the LinkLoader cancels the PrerenderHandle as the Document is
  // destroyed, even through the ContextLifecycleObserver has already abandoned
  // it.
  if (!prerender_)
    return;
  prerender_->Cancel();
  Detach();
}

const KURL& PrerenderHandle::Url() const {
  return prerender_->Url();
}

void PrerenderHandle::ContextDestroyed(ExecutionContext*) {
  // A PrerenderHandle is not removed from LifecycleNotifier::m_observers until
  // the next GC runs. Thus contextDestroyed() can be called for a
  // PrerenderHandle that is already cancelled (and thus detached). In that
  // case, we should not detach the PrerenderHandle again.
  if (!prerender_)
    return;
  prerender_->Abandon();
  Detach();
}

void PrerenderHandle::Detach() {
  prerender_->Dispose();
  prerender_.Clear();
}

void PrerenderHandle::Trace(blink::Visitor* visitor) {
  visitor->Trace(prerender_);
  ContextLifecycleObserver::Trace(visitor);
}

}  // namespace blink