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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef PreloadService_h__
#define PreloadService_h__
#include "nsIContentPolicy.h"
#include "nsIURI.h"
#include "nsRefPtrHashtable.h"
#include "mozilla/PreloadHashKey.h"
class nsINode;
namespace mozilla {
class PreloaderBase;
namespace dom {
class HTMLLinkElement;
class Document;
enum class ReferrerPolicy : uint8_t;
} // namespace dom
/**
* Intended to scope preloads
* (https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel/preload)
* and speculative loads initiated by the parser under one roof. This class
* is intended to be a member of dom::Document. Provides registration of
* speculative loads via a `key` which is defined to consist of the URL,
* resource type, and resource-specific attributes that are further
* distinguishing loads with otherwise same type and url.
*/
class PreloadService {
public:
explicit PreloadService(dom::Document*);
~PreloadService();
// Called by resource loaders to register a running resource load. This is
// called for a speculative load when it's started the first time, being it
// either regular speculative load or a preload.
//
// Returns false and does nothing if a preload is already registered under
// this key, true otherwise.
bool RegisterPreload(const PreloadHashKey& aKey, PreloaderBase* aPreload);
// Called when the load is about to be cancelled. Exact behavior is to be
// determined yet.
void DeregisterPreload(const PreloadHashKey& aKey);
// Called when the scope is to go away.
void ClearAllPreloads();
// True when there is a preload registered under the key.
bool PreloadExists(const PreloadHashKey& aKey);
// Returns an existing preload under the key or null, when there is none
// registered under the key.
already_AddRefed<PreloaderBase> LookupPreload(
const PreloadHashKey& aKey) const;
void SetSpeculationBase(nsIURI* aURI) { mSpeculationBaseURI = aURI; }
already_AddRefed<nsIURI> GetPreloadURI(const nsAString& aURL);
already_AddRefed<PreloaderBase> PreloadLinkElement(
dom::HTMLLinkElement* aLink, nsContentPolicyType aPolicyType);
// a non-zero aEarlyHintPreloaderId tells this service that a preload for this
// link was started by the EarlyHintPreloader and the preloaders should
// connect back by setting earlyHintPreloaderId in nsIChannelInternal before
// AsyncOpen.
void PreloadLinkHeader(nsIURI* aURI, const nsAString& aURL,
nsContentPolicyType aPolicyType, const nsAString& aAs,
const nsAString& aRel, const nsAString& aType,
const nsAString& aNonce, const nsAString& aIntegrity,
const nsAString& aSrcset, const nsAString& aSizes,
const nsAString& aCORS,
const nsAString& aReferrerPolicy,
uint64_t aEarlyHintPreloaderId,
const nsAString& aFetchPriority);
void PreloadScript(nsIURI* aURI, const nsAString& aType,
const nsAString& aCharset, const nsAString& aCrossOrigin,
const nsAString& aReferrerPolicy, const nsAString& aNonce,
const nsAString& aFetchPriority,
const nsAString& aIntegrity, bool aScriptFromHead,
uint64_t aEarlyHintPreloaderId);
void PreloadImage(nsIURI* aURI, const nsAString& aCrossOrigin,
const nsAString& aImageReferrerPolicy, bool aIsImgSet,
uint64_t aEarlyHintPreloaderId,
const nsAString& aFetchPriority);
void PreloadFont(nsIURI* aURI, const nsAString& aCrossOrigin,
const nsAString& aReferrerPolicy,
uint64_t aEarlyHintPreloaderId,
const nsAString& aFetchPriority);
void PreloadFetch(nsIURI* aURI, const nsAString& aCrossOrigin,
const nsAString& aReferrerPolicy,
uint64_t aEarlyHintPreloaderId,
const nsAString& aFetchPriority);
static void NotifyNodeEvent(nsINode* aNode, bool aSuccess);
void SetEarlyHintUsed() { mEarlyHintUsed = true; }
bool GetEarlyHintUsed() const { return mEarlyHintUsed; }
private:
dom::ReferrerPolicy PreloadReferrerPolicy(const nsAString& aReferrerPolicy);
nsIURI* BaseURIForPreload();
struct PreloadOrCoalesceResult {
RefPtr<PreloaderBase> mPreloader;
bool mAlreadyComplete;
};
PreloadOrCoalesceResult PreloadOrCoalesce(
nsIURI* aURI, const nsAString& aURL, nsContentPolicyType aPolicyType,
const nsAString& aAs, const nsAString& aRel, const nsAString& aType,
const nsAString& aCharset, const nsAString& aSrcset,
const nsAString& aSizes, const nsAString& aNonce,
const nsAString& aIntegrity, const nsAString& aCORS,
const nsAString& aReferrerPolicy, const nsAString& aFetchPriority,
bool aFromHeader, uint64_t aEarlyHintPreloaderId);
private:
nsRefPtrHashtable<PreloadHashKey, PreloaderBase> mPreloads;
// Raw pointer only, we are intended to be a direct member of dom::Document
dom::Document* mDocument;
// Set by `nsHtml5TreeOpExecutor::SetSpeculationBase`.
nsCOMPtr<nsIURI> mSpeculationBaseURI;
bool mEarlyHintUsed = false;
};
} // namespace mozilla
#endif
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