Ziele Untersuchung
mit Columbo Integrität von
Datenbanken Interaktion und
Portierbarkeit Ergonomie der
Schnittstellen

Angebot Produkte Projekt Beratung

Mittel Analytik Modellierung Sprachen Algebra Logik Hardware Denken Kreativität

Zusammenhänge Gesellschaft Wirtschaft Branche Firma


products/Sources/formale Sprachen/C/Firefox/dom/script/ (Browser von der Mozilla Stiftung Version 136.0.1^©) Datei vom 10.2.2025 mit Größe 5 kB

Quelle SharedScriptCache.cpp Sprache: C

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */

#include "SharedScriptCache.h"

#include "mozilla/Maybe.h"   // Maybe, Some, Nothing
#include "mozilla/Unused.h"  // Unused
#include "nsIPrefService.h"  // NS_PREFSERVICE_CONTRACTID
#include "nsIPrefBranch.h"   // nsIPrefBranch, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID
#include "nsISupportsImpl.h"    // NS_IMPL_ISUPPORTS
#include "nsIMemoryReporter.h"  // nsIMemoryReporter, MOZ_DEFINE_MALLOC_SIZE_OF, RegisterWeakMemoryReporter, UnregisterWeakMemoryReporter, MOZ_COLLECT_REPORT, KIND_HEAP, UNITS_BYTES
#include "mozilla/dom/ContentParent.h"  // dom::ContentParent
#include "nsIPrincipal.h"               // nsIPrincipal
#include "nsStringFwd.h"                // nsACString
#include "ScriptLoader.h"               // ScriptLoader
#include "ScriptLoadHandler.h"          // ScriptLoadHandler

namespace mozilla::dom {

ScriptHashKey::ScriptHashKey(ScriptLoader* aLoader,
                             const JS::loader::ScriptLoadRequest* aRequest)
    : PLDHashEntryHdr(),
      mURI(aRequest->mURI),
      mPrincipal(aRequest->TriggeringPrincipal()),
      mLoaderPrincipal(aLoader->LoaderPrincipal()),
      mPartitionPrincipal(aLoader->PartitionedPrincipal()),
      mCORSMode(aRequest->CORSMode()),
      mSRIMetadata(aRequest->mIntegrity),
      mKind(aRequest->mKind),
      mNonce(aRequest->Nonce()),
      mIsLinkRelPreload(aRequest->GetScriptLoadContext()->IsPreload()) {
  if (mKind == JS::loader::ScriptKind::eClassic) {
    if (aRequest->GetScriptLoadContext()->HasScriptElement()) {
      aRequest->GetScriptLoadContext()->GetHintCharset(mHintCharset);
    }
  }

  MOZ_COUNT_CTOR(ScriptHashKey);
}

ScriptHashKey::ScriptHashKey(const ScriptLoadData& aLoadData)
    : ScriptHashKey(aLoadData.CacheKey()) {}

bool ScriptHashKey::KeyEquals(const ScriptHashKey& aKey) const {
  if (mKind != aKey.mKind) {
    return false;
  }

  {
    bool eq;
    if (NS_FAILED(mURI->Equals(aKey.mURI, &eq)) || !eq) {
      return false;
    }
  }

  if (!mPrincipal->Equals(aKey.mPrincipal)) {
    return false;
  }

  if (mCORSMode != aKey.mCORSMode) {
    return false;
  }

  if (mNonce != aKey.mNonce) {
    return false;
  }

  // NOTE: module always use UTF-8.
  if (mKind == JS::loader::ScriptKind::eClassic) {
    if (mHintCharset != aKey.mHintCharset) {
      return false;
    }
  }

  if (!mSRIMetadata.CanTrustBeDelegatedTo(aKey.mSRIMetadata) ||
      !aKey.mSRIMetadata.CanTrustBeDelegatedTo(mSRIMetadata)) {
    return false;
  }

  return true;
}

NS_IMPL_ISUPPORTS(ScriptLoadData, nsISupports)

ScriptLoadData::ScriptLoadData(ScriptLoader* aLoader,
                               JS::loader::ScriptLoadRequest* aRequest)
    : mExpirationTime(aRequest->ExpirationTime()),
      mLoader(aLoader),
      mKey(aLoader, aRequest),
      mLoadedScript(aRequest->getLoadedScript()),
      mNetworkMetadata(aRequest->mNetworkMetadata) {}

NS_IMPL_ISUPPORTS(SharedScriptCache, nsIMemoryReporter, nsIObserver)

MOZ_DEFINE_MALLOC_SIZE_OF(SharedScriptCacheMallocSizeOf)

SharedScriptCache::SharedScriptCache() = default;

void SharedScriptCache::Init() {
  RegisterWeakMemoryReporter(this);

  // URL classification (tracking protection etc) are handled inside
  // nsHttpChannel.
  // The cache reflects the policy for whether to block or not, and once
  // the policy is modified, we should discard the cache, to avoid running
  // a cached script which is supposed to be blocked.
  nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
  if (prefs) {
    prefs->AddObserver("urlclassifier", this, false);
    prefs->AddObserver("privacy.trackingprotection.enabled", this, false);
  }
}

SharedScriptCache::~SharedScriptCache() { UnregisterWeakMemoryReporter(this); }

void SharedScriptCache::LoadCompleted(SharedScriptCache* aCache,
                                      ScriptLoadData& aData) {}

NS_IMETHODIMP
SharedScriptCache::CollectReports(nsIHandleReportCallback* aHandleReport,
                                  nsISupports* aData, bool aAnonymize) {
  MOZ_COLLECT_REPORT("explicit/js-non-window/cache", KIND_HEAP, UNITS_BYTES,
                     SizeOfIncludingThis(SharedScriptCacheMallocSizeOf),
                     "Memory used for SharedScriptCache to share script "
                     "across documents");
  return NS_OK;
}

NS_IMETHODIMP
SharedScriptCache::Observe(nsISupports* aSubject, const char* aTopic,
                           const char16_t* aData) {
  if (strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID) == 0) {
    SharedScriptCache::Clear();
  }

  return NS_OK;
}

void SharedScriptCache::Clear(const Maybe<nsCOMPtr<nsIPrincipal>>& aPrincipal,
                              const Maybe<nsCString>& aSchemelessSite,
                              const Maybe<OriginAttributesPattern>& aPattern) {
  using ContentParent = dom::ContentParent;

  if (XRE_IsParentProcess()) {
    for (auto* cp : ContentParent::AllProcesses(ContentParent::eLive)) {
      Unused << cp->SendClearScriptCache(aPrincipal, aSchemelessSite, aPattern);
    }
  }

  if (sSingleton) {
    sSingleton->ClearInProcess(aPrincipal, aSchemelessSite, aPattern);
  }
}

}  // namespace mozilla::dom

quality97%

¤ Dauer der Verarbeitung: 0.11 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.