layout/style/URLExtraData.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 /* thread-safe container of information for resolving url values */
   8
   9 #ifndef mozilla_URLExtraData_h
  10 #define mozilla_URLExtraData_h
  11
  12 #include <utility>
  13
  14 #include "mozilla/StaticPtr.h"
  15 #include "mozilla/UserAgentStyleSheetID.h"
  16 #include "mozilla/dom/URL.h"
  17 #include "nsCOMPtr.h"
  18 #include "nsIPrincipal.h"
  19 #include "nsIReferrerInfo.h"
  20 #include "nsIURI.h"
  21
  22 namespace mozilla {
  23
  24 struct URLExtraData {
  25   URLExtraData(already_AddRefed<nsIURI> aBaseURI,
  26                already_AddRefed<nsIReferrerInfo> aReferrerInfo,
  27                already_AddRefed<nsIPrincipal> aPrincipal)
  28       : mBaseURI(std::move(aBaseURI)),
  29         mReferrerInfo(std::move(aReferrerInfo)),
  30         mPrincipal(std::move(aPrincipal)) {
  31     MOZ_ASSERT(mBaseURI);
  32     MOZ_ASSERT(mPrincipal);
  33     MOZ_ASSERT(mReferrerInfo);
  34     // When we hold the URI data of a style sheet, referrer is always
  35     // equal to the sheet URI.
  36     nsCOMPtr<nsIURI> referrer = mReferrerInfo->GetOriginalReferrer();
  37     mChromeRulesEnabled = referrer && (referrer->SchemeIs("chrome") ||
  38                                        referrer->SchemeIs("resource"));
  39   }
  40
  41   URLExtraData(nsIURI* aBaseURI, nsIReferrerInfo* aReferrerInfo,
  42                nsIPrincipal* aPrincipal)
  43       : URLExtraData(do_AddRef(aBaseURI), do_AddRef(aReferrerInfo),
  44                      do_AddRef(aPrincipal)) {}
  45
  46   NS_INLINE_DECL_THREADSAFE_REFCOUNTING(URLExtraData)
  47
  48   nsIURI* BaseURI() const { return mBaseURI; }
  49   nsIReferrerInfo* ReferrerInfo() const { return mReferrerInfo; }
  50   nsIPrincipal* Principal() const { return mPrincipal; }
  51
  52   bool ChromeRulesEnabled() const { return mChromeRulesEnabled; }
  53
  54   static URLExtraData* Dummy() {
  55     MOZ_ASSERT(sDummy);
  56     return sDummy;
  57   }
  58
  59   static URLExtraData* DummyChrome() {
  60     MOZ_ASSERT(sDummyChrome);
  61     return sDummyChrome;
  62   }
  63
  64   static void Init();
  65   static void Shutdown();
  66
  67   // URLExtraData objects that shared style sheets use a sheet ID index to
  68   // refer to.
  69   static StaticRefPtr<URLExtraData>
  70       sShared[size_t(UserAgentStyleSheetID::Count)];
  71
  72  private:
  73   ~URLExtraData();
  74
  75   nsCOMPtr<nsIURI> mBaseURI;
  76   nsCOMPtr<nsIReferrerInfo> mReferrerInfo;
  77   nsCOMPtr<nsIPrincipal> mPrincipal;
  78
  79   bool mChromeRulesEnabled;
  80
  81   static StaticRefPtr<URLExtraData> sDummy;
  82   static StaticRefPtr<URLExtraData> sDummyChrome;
  83 };
  84
  85 }  // namespace mozilla
  86
  87 #endif  // mozilla_URLExtraData_h