mirror of
https://github.com/classilla/tenfourfox.git
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622 lines
24 KiB
C++
622 lines
24 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* loading of CSS style sheets using the network APIs */
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#ifndef mozilla_css_Loader_h
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#define mozilla_css_Loader_h
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#include "nsIPrincipal.h"
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#include "nsAutoPtr.h"
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#include "nsCompatibility.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsDataHashtable.h"
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#include "nsRefPtrHashtable.h"
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#include "nsStringFwd.h"
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#include "nsTArray.h"
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#include "nsTObserverArray.h"
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#include "nsURIHashKey.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/CORSMode.h"
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#include "mozilla/CSSStyleSheet.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/net/ReferrerPolicy.h"
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class nsICSSLoaderObserver;
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class nsIContent;
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class nsIDocument;
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class nsMediaList;
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class nsIStyleSheetLinkingElement;
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namespace mozilla {
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namespace dom {
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class Element;
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} // namespace dom
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} // namespace mozilla
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namespace mozilla {
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class URIPrincipalReferrerPolicyAndCORSModeHashKey : public nsURIHashKey
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{
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public:
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typedef URIPrincipalReferrerPolicyAndCORSModeHashKey* KeyType;
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typedef const URIPrincipalReferrerPolicyAndCORSModeHashKey* KeyTypePointer;
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typedef mozilla::net::ReferrerPolicy ReferrerPolicy;
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explicit URIPrincipalReferrerPolicyAndCORSModeHashKey(const URIPrincipalReferrerPolicyAndCORSModeHashKey* aKey)
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: nsURIHashKey(aKey->mKey),
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mPrincipal(aKey->mPrincipal),
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mCORSMode(aKey->mCORSMode),
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mReferrerPolicy(aKey->mReferrerPolicy)
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{
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MOZ_COUNT_CTOR(URIPrincipalReferrerPolicyAndCORSModeHashKey);
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}
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URIPrincipalReferrerPolicyAndCORSModeHashKey(nsIURI* aURI,
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nsIPrincipal* aPrincipal,
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CORSMode aCORSMode,
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ReferrerPolicy aReferrerPolicy)
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: nsURIHashKey(aURI),
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mPrincipal(aPrincipal),
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mCORSMode(aCORSMode),
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mReferrerPolicy(aReferrerPolicy)
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{
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MOZ_COUNT_CTOR(URIPrincipalReferrerPolicyAndCORSModeHashKey);
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}
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URIPrincipalReferrerPolicyAndCORSModeHashKey(const URIPrincipalReferrerPolicyAndCORSModeHashKey& toCopy)
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: nsURIHashKey(toCopy),
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mPrincipal(toCopy.mPrincipal),
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mCORSMode(toCopy.mCORSMode),
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mReferrerPolicy(toCopy.mReferrerPolicy)
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{
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MOZ_COUNT_CTOR(URIPrincipalReferrerPolicyAndCORSModeHashKey);
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}
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~URIPrincipalReferrerPolicyAndCORSModeHashKey()
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{
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MOZ_COUNT_DTOR(URIPrincipalReferrerPolicyAndCORSModeHashKey);
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}
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URIPrincipalReferrerPolicyAndCORSModeHashKey* GetKey() const {
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return const_cast<URIPrincipalReferrerPolicyAndCORSModeHashKey*>(this);
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}
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const URIPrincipalReferrerPolicyAndCORSModeHashKey* GetKeyPointer() const { return this; }
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bool KeyEquals(const URIPrincipalReferrerPolicyAndCORSModeHashKey* aKey) const {
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if (!nsURIHashKey::KeyEquals(aKey->mKey)) {
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return false;
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}
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if (!mPrincipal != !aKey->mPrincipal) {
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// One or the other has a principal, but not both... not equal
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return false;
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}
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if (mCORSMode != aKey->mCORSMode) {
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// Different CORS modes; we don't match
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return false;
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}
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if (mReferrerPolicy != aKey->mReferrerPolicy) {
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// Different ReferrerPolicy; we don't match
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return false;
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}
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bool eq;
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return !mPrincipal ||
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(NS_SUCCEEDED(mPrincipal->Equals(aKey->mPrincipal, &eq)) && eq);
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}
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static const URIPrincipalReferrerPolicyAndCORSModeHashKey*
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KeyToPointer(URIPrincipalReferrerPolicyAndCORSModeHashKey* aKey) { return aKey; }
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static PLDHashNumber HashKey(const URIPrincipalReferrerPolicyAndCORSModeHashKey* aKey) {
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return nsURIHashKey::HashKey(aKey->mKey);
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}
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nsIURI* GetURI() const { return nsURIHashKey::GetKey(); }
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enum { ALLOW_MEMMOVE = true };
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protected:
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nsCOMPtr<nsIPrincipal> mPrincipal;
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CORSMode mCORSMode;
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ReferrerPolicy mReferrerPolicy;
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};
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namespace css {
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class SheetLoadData;
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class ImportRule;
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/*********************
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* Style sheet reuse *
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*********************/
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class MOZ_RAII LoaderReusableStyleSheets
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{
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public:
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LoaderReusableStyleSheets()
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{
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}
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/**
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* Look for a reusable sheet (see AddReusableSheet) matching the
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* given URL. If found, set aResult, remove the reused sheet from
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* the internal list, and return true. If not found, return false;
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* in this case, aResult is not modified.
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*
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* @param aURL the url to match
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* @param aResult [out] the style sheet which can be reused
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*/
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bool FindReusableStyleSheet(nsIURI* aURL, RefPtr<CSSStyleSheet>& aResult);
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/**
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* Indicate that a certain style sheet is available for reuse if its
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* URI matches the URI of an @import. Sheets should be added in the
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* opposite order in which they are intended to be reused.
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*
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* @param aSheet the sheet which can be reused
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*/
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void AddReusableSheet(CSSStyleSheet* aSheet) {
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mReusableSheets.AppendElement(aSheet);
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}
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private:
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LoaderReusableStyleSheets(const LoaderReusableStyleSheets&) = delete;
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LoaderReusableStyleSheets& operator=(const LoaderReusableStyleSheets&) = delete;
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// The sheets that can be reused.
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nsTArray<RefPtr<CSSStyleSheet>> mReusableSheets;
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};
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/***********************************************************************
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* Enum that describes the state of the sheet returned by CreateSheet. *
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***********************************************************************/
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enum StyleSheetState {
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eSheetStateUnknown = 0,
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eSheetNeedsParser,
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eSheetPending,
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eSheetLoading,
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eSheetComplete
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};
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/**
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* Enum defining the mode in which a sheet is to be parsed. This is
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* usually, but not always, the same as the cascade level at which the
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* sheet will apply (see nsStyleSet.h). Most of the Loader APIs only
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* support loading of author sheets.
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*
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* Author sheets are the normal case: styles embedded in or linked
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* from HTML pages. They are also the most restricted.
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*
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* User sheets can do anything author sheets can do, and also get
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* access to a few CSS extensions that are not yet suitable for
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* exposure on the public Web, but are very useful for expressing
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* user style overrides, such as @-moz-document rules.
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*
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* Agent sheets have access to all author- and user-sheet features
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* plus more extensions that are necessary for internal use but,
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* again, not yet suitable for exposure on the public Web. Some of
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* these are outright unsafe to expose; in particular, incorrect
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* styling of anonymous box pseudo-elements can violate layout
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* invariants.
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*/
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enum SheetParsingMode {
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eAuthorSheetFeatures = 0,
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eUserSheetFeatures,
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eAgentSheetFeatures
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};
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class Loader final {
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typedef mozilla::net::ReferrerPolicy ReferrerPolicy;
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public:
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Loader();
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explicit Loader(nsIDocument*);
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private:
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// Private destructor, to discourage deletion outside of Release():
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~Loader();
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public:
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NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(Loader)
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NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS(Loader)
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void DropDocumentReference(); // notification that doc is going away
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void SetCompatibilityMode(nsCompatibility aCompatMode)
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{ mCompatMode = aCompatMode; }
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nsCompatibility GetCompatibilityMode() { return mCompatMode; }
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nsresult SetPreferredSheet(const nsAString& aTitle);
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// XXXbz sort out what the deal is with events! When should they fire?
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/**
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* Load an inline style sheet. If a successful result is returned and
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* *aCompleted is false, then aObserver is guaranteed to be notified
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* asynchronously once the sheet is marked complete. If an error is
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* returned, or if *aCompleted is true, aObserver will not be notified. In
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* addition to parsing the sheet, this method will insert it into the
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* stylesheet list of this CSSLoader's document.
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*
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* @param aElement the element linking to the stylesheet. This must not be
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* null and must implement nsIStyleSheetLinkingElement.
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* @param aBuffer the stylesheet data
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* @param aLineNumber the line number at which the stylesheet data started.
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* @param aTitle the title of the sheet.
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* @param aMedia the media string for the sheet.
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* @param aObserver the observer to notify when the load completes.
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* May be null.
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* @param [out] aCompleted whether parsing of the sheet completed.
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* @param [out] aIsAlternate whether the stylesheet ended up being an
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* alternate sheet.
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*/
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nsresult LoadInlineStyle(nsIContent* aElement,
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const nsAString& aBuffer,
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uint32_t aLineNumber,
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const nsAString& aTitle,
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const nsAString& aMedia,
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mozilla::dom::Element* aScopeElement,
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nsICSSLoaderObserver* aObserver,
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bool* aCompleted,
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bool* aIsAlternate);
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/**
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* Load a linked (document) stylesheet. If a successful result is returned,
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* aObserver is guaranteed to be notified asynchronously once the sheet is
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* loaded and marked complete. If an error is returned, aObserver will not
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* be notified. In addition to loading the sheet, this method will insert it
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* into the stylesheet list of this CSSLoader's document.
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*
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* @param aElement the element linking to the the stylesheet. May be null.
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* @param aURL the URL of the sheet.
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* @param aTitle the title of the sheet.
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* @param aMedia the media string for the sheet.
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* @param aHasAlternateRel whether the rel for this link included
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* "alternate".
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* @param aCORSMode the CORS mode for this load.
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* @param aObserver the observer to notify when the load completes.
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* May be null.
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* @param [out] aIsAlternate whether the stylesheet actually ended up beinga
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* an alternate sheet. Note that this need not match
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* aHasAlternateRel.
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*/
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nsresult LoadStyleLink(nsIContent* aElement,
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nsIURI* aURL,
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const nsAString& aTitle,
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const nsAString& aMedia,
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bool aHasAlternateRel,
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CORSMode aCORSMode,
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ReferrerPolicy aReferrerPolicy,
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const nsAString& aIntegrity,
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nsICSSLoaderObserver* aObserver,
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bool* aIsAlternate);
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/**
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* Load a child (@import-ed) style sheet. In addition to loading the sheet,
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* this method will insert it into the child sheet list of aParentSheet. If
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* there is no sheet currently being parsed and the child sheet is not
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* complete when this method returns, then when the child sheet becomes
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* complete aParentSheet will be QIed to nsICSSLoaderObserver and
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* asynchronously notified, just like for LoadStyleLink. Note that if the
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* child sheet is already complete when this method returns, no
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* nsICSSLoaderObserver notification will be sent.
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*
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* @param aParentSheet the parent of this child sheet
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* @param aURL the URL of the child sheet
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* @param aMedia the already-parsed media list for the child sheet
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* @param aRule the @import rule importing this child. This is used to
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* properly order the child sheet list of aParentSheet.
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* @param aSavedSheets any saved style sheets which could be reused
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* for this load
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*/
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nsresult LoadChildSheet(CSSStyleSheet* aParentSheet,
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nsIURI* aURL,
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nsMediaList* aMedia,
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ImportRule* aRule,
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LoaderReusableStyleSheets* aSavedSheets);
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/**
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* Synchronously load and return the stylesheet at aURL. Any child sheets
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* will also be loaded synchronously. Note that synchronous loads over some
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* protocols may involve spinning up a new event loop, so use of this method
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* does NOT guarantee not receiving any events before the sheet loads. This
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* method can be used to load sheets not associated with a document.
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*
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* @param aURL the URL of the sheet to load
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* @param aParsingMode the mode in which to parse the sheet
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* (see comments at enum SheetParsingMode, above).
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* @param aUseSystemPrincipal if true, give the resulting sheet the system
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* principal no matter where it's being loaded from.
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* @param [out] aSheet the loaded, complete sheet.
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*
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* NOTE: At the moment, this method assumes the sheet will be UTF-8, but
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* ideally it would allow arbitrary encodings. Callers should NOT depend on
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* non-UTF8 sheets being treated as UTF-8 by this method.
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*
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* NOTE: A successful return from this method doesn't indicate anything about
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* whether the data could be parsed as CSS and doesn't indicate anything
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* about the status of child sheets of the returned sheet.
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*/
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nsresult LoadSheetSync(nsIURI* aURL,
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SheetParsingMode aParsingMode,
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bool aUseSystemPrincipal,
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CSSStyleSheet** aSheet);
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/**
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* As above, but defaults aParsingMode to eAuthorSheetFeatures and
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* aUseSystemPrincipal to false.
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*/
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nsresult LoadSheetSync(nsIURI* aURL, CSSStyleSheet** aSheet) {
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return LoadSheetSync(aURL, eAuthorSheetFeatures, false, aSheet);
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}
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/**
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* Asynchronously load the stylesheet at aURL. If a successful result is
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* returned, aObserver is guaranteed to be notified asynchronously once the
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* sheet is loaded and marked complete. This method can be used to load
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* sheets not associated with a document. This method cannot be used to
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* load user or agent sheets.
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*
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* @param aURL the URL of the sheet to load
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* @param aOriginPrincipal the principal to use for security checks. This
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* can be null to indicate that these checks should
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* be skipped.
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* @param aCharset the encoding to use for converting the sheet data
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* from bytes to Unicode. May be empty to indicate that the
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* charset of the CSSLoader's document should be used. This
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* is only used if neither the network transport nor the
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* sheet itself indicate an encoding.
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* @param aObserver the observer to notify when the load completes.
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* Must not be null.
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* @param [out] aSheet the sheet to load. Note that the sheet may well
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* not be loaded by the time this method returns.
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*/
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nsresult LoadSheet(nsIURI* aURL,
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nsIPrincipal* aOriginPrincipal,
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const nsCString& aCharset,
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nsICSSLoaderObserver* aObserver,
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CSSStyleSheet** aSheet);
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/**
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* Same as above, to be used when the caller doesn't care about the
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* not-yet-loaded sheet.
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*/
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nsresult LoadSheet(nsIURI* aURL,
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bool aIsPreload,
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nsIPrincipal* aOriginPrincipal,
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const nsCString& aCharset,
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nsICSSLoaderObserver* aObserver,
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CORSMode aCORSMode = CORS_NONE,
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ReferrerPolicy aReferrerPolicy = mozilla::net::RP_Default,
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const nsAString& aIntegrity = EmptyString());
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/**
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* Stop loading all sheets. All nsICSSLoaderObservers involved will be
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* notified with NS_BINDING_ABORTED as the status, possibly synchronously.
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*/
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nsresult Stop(void);
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/**
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* nsresult Loader::StopLoadingSheet(nsIURI* aURL), which notifies the
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* nsICSSLoaderObserver with NS_BINDING_ABORTED, was removed in Bug 556446.
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* It can be found in revision 2c44a32052ad.
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*/
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/**
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* Whether the loader is enabled or not.
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* When disabled, processing of new styles is disabled and an attempt
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* to do so will fail with a return code of
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* NS_ERROR_NOT_AVAILABLE. Note that this DOES NOT disable
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* currently loading styles or already processed styles.
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*/
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bool GetEnabled() { return mEnabled; }
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void SetEnabled(bool aEnabled) { mEnabled = aEnabled; }
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/**
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* Get the document we live for. May return null.
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*/
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nsIDocument* GetDocument() const { return mDocument; }
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/**
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* Return true if this loader has pending loads (ones that would send
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* notifications to an nsICSSLoaderObserver attached to this loader).
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* If called from inside nsICSSLoaderObserver::StyleSheetLoaded, this will
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* return false if and only if that is the last StyleSheetLoaded
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* notification the CSSLoader knows it's going to send. In other words, if
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* two sheets load at once (via load coalescing, e.g.), HasPendingLoads()
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* will return true during notification for the first one, and false
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* during notification for the second one.
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*/
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bool HasPendingLoads();
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/**
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* Add an observer to this loader. The observer will be notified
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* for all loads that would have notified their own observers (even
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* if those loads don't have observers attached to them).
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* Load-specific observers will be notified before generic
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* observers. The loader holds a reference to the observer.
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*
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* aObserver must not be null.
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*/
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nsresult AddObserver(nsICSSLoaderObserver* aObserver);
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/**
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* Remove an observer added via AddObserver.
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*/
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void RemoveObserver(nsICSSLoaderObserver* aObserver);
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// These interfaces are public only for the benefit of static functions
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// within nsCSSLoader.cpp.
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// IsAlternate can change our currently selected style set if none
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// is selected and aHasAlternateRel is false.
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bool IsAlternate(const nsAString& aTitle, bool aHasAlternateRel);
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typedef nsTArray<RefPtr<SheetLoadData> > LoadDataArray;
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// Measure our size.
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size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
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// Marks all the sheets at the given URI obsolete, and removes them from the
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// cache.
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nsresult ObsoleteSheet(nsIURI* aURI);
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private:
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friend class SheetLoadData;
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static PLDHashOperator
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RemoveEntriesWithURI(URIPrincipalReferrerPolicyAndCORSModeHashKey* aKey,
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RefPtr<CSSStyleSheet>& aSheet,
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void* aUserData);
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// Note: null aSourcePrincipal indicates that the content policy and
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// CheckLoadURI checks should be skipped.
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// aIsPreload indicates whether the html parser preloads that
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// stylesheet or if it is a regular load.
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nsresult CheckLoadAllowed(nsIPrincipal* aSourcePrincipal,
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nsIURI* aTargetURI,
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nsISupports* aContext,
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bool aIsPreload);
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// For inline style, the aURI param is null, but the aLinkingContent
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// must be non-null then. The loader principal must never be null
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// if aURI is not null.
|
|
// *aIsAlternate is set based on aTitle and aHasAlternateRel.
|
|
nsresult CreateSheet(nsIURI* aURI,
|
|
nsIContent* aLinkingContent,
|
|
nsIPrincipal* aLoaderPrincipal,
|
|
CORSMode aCORSMode,
|
|
ReferrerPolicy aReferrerPolicy,
|
|
const nsAString& aIntegrity,
|
|
bool aSyncLoad,
|
|
bool aHasAlternateRel,
|
|
const nsAString& aTitle,
|
|
StyleSheetState& aSheetState,
|
|
bool *aIsAlternate,
|
|
CSSStyleSheet** aSheet);
|
|
|
|
// Pass in either a media string or the nsMediaList from the
|
|
// CSSParser. Don't pass both.
|
|
// This method will set the sheet's enabled state based on isAlternate
|
|
void PrepareSheet(CSSStyleSheet* aSheet,
|
|
const nsAString& aTitle,
|
|
const nsAString& aMediaString,
|
|
nsMediaList* aMediaList,
|
|
dom::Element* aScopeElement,
|
|
bool isAlternate);
|
|
|
|
nsresult InsertSheetInDoc(CSSStyleSheet* aSheet,
|
|
nsIContent* aLinkingContent,
|
|
nsIDocument* aDocument);
|
|
|
|
nsresult InsertChildSheet(CSSStyleSheet* aSheet,
|
|
CSSStyleSheet* aParentSheet,
|
|
ImportRule* aParentRule);
|
|
|
|
nsresult InternalLoadNonDocumentSheet(nsIURI* aURL,
|
|
bool aIsPreload,
|
|
SheetParsingMode aParsingMode,
|
|
bool aUseSystemPrincipal,
|
|
nsIPrincipal* aOriginPrincipal,
|
|
const nsCString& aCharset,
|
|
CSSStyleSheet** aSheet,
|
|
nsICSSLoaderObserver* aObserver,
|
|
CORSMode aCORSMode = CORS_NONE,
|
|
ReferrerPolicy aReferrerPolicy = mozilla::net::RP_Default,
|
|
const nsAString& aIntegrity = EmptyString());
|
|
|
|
// Post a load event for aObserver to be notified about aSheet. The
|
|
// notification will be sent with status NS_OK unless the load event is
|
|
// canceled at some point (in which case it will be sent with
|
|
// NS_BINDING_ABORTED). aWasAlternate indicates the state when the load was
|
|
// initiated, not the state at some later time. aURI should be the URI the
|
|
// sheet was loaded from (may be null for inline sheets). aElement is the
|
|
// owning element for this sheet.
|
|
nsresult PostLoadEvent(nsIURI* aURI,
|
|
CSSStyleSheet* aSheet,
|
|
nsICSSLoaderObserver* aObserver,
|
|
bool aWasAlternate,
|
|
nsIStyleSheetLinkingElement* aElement);
|
|
|
|
// Start the loads of all the sheets in mPendingDatas
|
|
void StartAlternateLoads();
|
|
|
|
// Handle an event posted by PostLoadEvent
|
|
void HandleLoadEvent(SheetLoadData* aEvent);
|
|
|
|
// Note: LoadSheet is responsible for releasing aLoadData and setting the
|
|
// sheet to complete on failure.
|
|
nsresult LoadSheet(SheetLoadData* aLoadData,
|
|
StyleSheetState aSheetState,
|
|
bool aIsPreLoad);
|
|
|
|
// Parse the stylesheet in aLoadData. The sheet data comes from aInput.
|
|
// Set aCompleted to true if the parse finished, false otherwise (e.g. if the
|
|
// sheet had an @import). If aCompleted is true when this returns, then
|
|
// ParseSheet also called SheetComplete on aLoadData.
|
|
nsresult ParseSheet(const nsAString& aInput,
|
|
SheetLoadData* aLoadData,
|
|
bool& aCompleted);
|
|
|
|
// The load of the sheet in aLoadData is done, one way or another. Do final
|
|
// cleanup, including releasing aLoadData.
|
|
void SheetComplete(SheetLoadData* aLoadData, nsresult aStatus);
|
|
|
|
// The guts of SheetComplete. This may be called recursively on parent datas
|
|
// or datas that had glommed on to a single load. The array is there so load
|
|
// datas whose observers need to be notified can be added to it.
|
|
void DoSheetComplete(SheetLoadData* aLoadData, nsresult aStatus,
|
|
LoadDataArray& aDatasToNotify);
|
|
|
|
struct Sheets {
|
|
nsRefPtrHashtable<URIPrincipalReferrerPolicyAndCORSModeHashKey, CSSStyleSheet>
|
|
mCompleteSheets;
|
|
nsDataHashtable<URIPrincipalReferrerPolicyAndCORSModeHashKey, SheetLoadData*>
|
|
mLoadingDatas; // weak refs
|
|
nsDataHashtable<URIPrincipalReferrerPolicyAndCORSModeHashKey, SheetLoadData*>
|
|
mPendingDatas; // weak refs
|
|
};
|
|
nsAutoPtr<Sheets> mSheets;
|
|
|
|
// We're not likely to have many levels of @import... But likely to have
|
|
// some. Allocate some storage, what the hell.
|
|
nsAutoTArray<SheetLoadData*, 8> mParsingDatas;
|
|
|
|
// The array of posted stylesheet loaded events (SheetLoadDatas) we have.
|
|
// Note that these are rare.
|
|
LoadDataArray mPostedEvents;
|
|
|
|
// Our array of "global" observers
|
|
nsTObserverArray<nsCOMPtr<nsICSSLoaderObserver> > mObservers;
|
|
|
|
// This reference is nulled by the Document in it's destructor through
|
|
// DropDocumentReference().
|
|
nsIDocument* MOZ_NON_OWNING_REF mDocument; // the document we live for
|
|
|
|
|
|
// Number of datas still waiting to be notified on if we're notifying on a
|
|
// whole bunch at once (e.g. in one of the stop methods). This is used to
|
|
// make sure that HasPendingLoads() won't return false until we're notifying
|
|
// on the last data we're working with.
|
|
uint32_t mDatasToNotifyOn;
|
|
|
|
nsCompatibility mCompatMode;
|
|
nsString mPreferredSheet; // title of preferred sheet
|
|
|
|
bool mEnabled; // is enabled to load new styles
|
|
|
|
#ifdef DEBUG
|
|
bool mSyncCallback;
|
|
#endif
|
|
};
|
|
|
|
} // namespace css
|
|
} // namespace mozilla
|
|
|
|
#endif /* mozilla_css_Loader_h */
|