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Diffstat (limited to 'layout/style/Loader.cpp')
| -rw-r--r-- | layout/style/Loader.cpp | 2694 |
1 files changed, 2694 insertions, 0 deletions
diff --git a/layout/style/Loader.cpp b/layout/style/Loader.cpp new file mode 100644 index 000000000..a1a0fcfd9 --- /dev/null +++ b/layout/style/Loader.cpp @@ -0,0 +1,2694 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * vim: ft=cpp tw=78 sw=2 et ts=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/. + * + * This Original Code has been modified by IBM Corporation. + * Modifications made by IBM described herein are Copyright (c) + * International Business Machines Corporation, 2000. Modifications + * to Mozilla code or documentation identified per MPL Section 3.3 + * + * Date Modified by Description of modification + * 04/20/2000 IBM Corp. OS/2 VisualAge build. + */ + +/* loading of CSS style sheets using the network APIs */ + +#include "mozilla/ArrayUtils.h" +#include "mozilla/LoadInfo.h" +#include "mozilla/MemoryReporting.h" + +#include "mozilla/css/Loader.h" +#include "mozilla/StyleSheetInlines.h" +#include "nsIRunnable.h" +#include "nsIUnicharStreamLoader.h" +#include "nsSyncLoadService.h" +#include "nsCOMPtr.h" +#include "nsString.h" +#include "nsIContent.h" +#include "nsIDocument.h" +#include "nsIDOMNode.h" +#include "nsIDOMDocument.h" +#include "nsIURI.h" +#include "nsNetUtil.h" +#include "nsIProtocolHandler.h" +#include "nsContentUtils.h" +#include "nsIScriptSecurityManager.h" +#include "nsContentPolicyUtils.h" +#include "nsIHttpChannel.h" +#include "nsIHttpChannelInternal.h" +#include "nsIClassOfService.h" +#include "nsIScriptError.h" +#include "nsMimeTypes.h" +#include "nsIStyleSheetLinkingElement.h" +#include "nsICSSLoaderObserver.h" +#include "nsCSSParser.h" +#include "mozilla/css/ImportRule.h" +#include "nsThreadUtils.h" +#include "nsGkAtoms.h" +#include "nsIThreadInternal.h" +#include "nsINetworkPredictor.h" +#include "mozilla/dom/ShadowRoot.h" +#include "mozilla/dom/URL.h" +#include "mozilla/AsyncEventDispatcher.h" +#include "mozilla/StyleSheet.h" +#include "mozilla/StyleSheetInlines.h" +#include "mozilla/ConsoleReportCollector.h" + +#ifdef MOZ_XUL +#include "nsXULPrototypeCache.h" +#endif + +#include "nsIMediaList.h" +#include "nsIDOMStyleSheet.h" +#include "nsError.h" + +#include "nsIContentSecurityPolicy.h" +#include "mozilla/dom/SRICheck.h" + +#include "mozilla/dom/EncodingUtils.h" +using mozilla::dom::EncodingUtils; + +using namespace mozilla::dom; + +/** + * OVERALL ARCHITECTURE + * + * The CSS Loader gets requests to load various sorts of style sheets: + * inline style from <style> elements, linked style, @import-ed child + * sheets, non-document sheets. The loader handles the following tasks: + * 1) Creation of the actual style sheet objects: CreateSheet() + * 2) setting of the right media, title, enabled state, etc on the + * sheet: PrepareSheet() + * 3) Insertion of the sheet in the proper cascade order: + * InsertSheetInDoc() and InsertChildSheet() + * 4) Load of the sheet: LoadSheet() including security checks + * 5) Parsing of the sheet: ParseSheet() + * 6) Cleanup: SheetComplete() + * + * The detailed documentation for these functions is found with the + * function implementations. + * + * The following helper object is used: + * SheetLoadData -- a small class that is used to store all the + * information needed for the loading of a sheet; + * this class handles listening for the stream + * loader completion and also handles charset + * determination. + */ + +namespace mozilla { +namespace css { + +/********************************************* + * Data needed to properly load a stylesheet * + *********************************************/ + +static_assert(eAuthorSheetFeatures == 0 && + eUserSheetFeatures == 1 && + eAgentSheetFeatures == 2, + "sheet parsing mode constants won't fit " + "in SheetLoadData::mParsingMode"); + +class SheetLoadData final : public nsIRunnable, + public nsIUnicharStreamLoaderObserver, + public nsIThreadObserver +{ +protected: + virtual ~SheetLoadData(void); + +public: + // Data for loading a sheet linked from a document + SheetLoadData(Loader* aLoader, + const nsSubstring& aTitle, + nsIURI* aURI, + StyleSheet* aSheet, + nsIStyleSheetLinkingElement* aOwningElement, + bool aIsAlternate, + nsICSSLoaderObserver* aObserver, + nsIPrincipal* aLoaderPrincipal, + nsINode* aRequestingNode); + + // Data for loading a sheet linked from an @import rule + SheetLoadData(Loader* aLoader, + nsIURI* aURI, + StyleSheet* aSheet, + SheetLoadData* aParentData, + nsICSSLoaderObserver* aObserver, + nsIPrincipal* aLoaderPrincipal, + nsINode* aRequestingNode); + + // Data for loading a non-document sheet + SheetLoadData(Loader* aLoader, + nsIURI* aURI, + StyleSheet* aSheet, + bool aSyncLoad, + bool aUseSystemPrincipal, + const nsCString& aCharset, + nsICSSLoaderObserver* aObserver, + nsIPrincipal* aLoaderPrincipal, + nsINode* aRequestingNode); + + already_AddRefed<nsIURI> GetReferrerURI(); + + void ScheduleLoadEventIfNeeded(nsresult aStatus); + + NS_DECL_ISUPPORTS + NS_DECL_NSIRUNNABLE + NS_DECL_NSITHREADOBSERVER + NS_DECL_NSIUNICHARSTREAMLOADEROBSERVER + + // Hold a ref to the CSSLoader so we can call back to it to let it + // know the load finished + RefPtr<Loader> mLoader; + + // Title needed to pull datas out of the pending datas table when + // the preferred title is changed + nsString mTitle; + + // Charset we decided to use for the sheet + nsCString mCharset; + + // URI we're loading. Null for inline sheets + nsCOMPtr<nsIURI> mURI; + + // Should be 1 for non-inline sheets. + uint32_t mLineNumber; + + // The sheet we're loading data for + RefPtr<StyleSheet> mSheet; + + // Linked list of datas for the same URI as us + SheetLoadData* mNext; // strong ref + + // Load data for the sheet that @import-ed us if we were @import-ed + // during the parse + RefPtr<SheetLoadData> mParentData; + + // Number of sheets we @import-ed that are still loading + uint32_t mPendingChildren; + + // mSyncLoad is true when the load needs to be synchronous -- right + // now only for LoadSheetSync and children of sync loads. + bool mSyncLoad : 1; + + // mIsNonDocumentSheet is true if the load was triggered by LoadSheetSync or + // LoadSheet or an @import from such a sheet. Non-document sheet loads can + // proceed even if we have no document. + bool mIsNonDocumentSheet : 1; + + // mIsLoading is true from the moment we are placed in the loader's + // "loading datas" table (right after the async channel is opened) + // to the moment we are removed from said table (due to the load + // completing or being cancelled). + bool mIsLoading : 1; + + // mIsCancelled is set to true when a sheet load is stopped by + // Stop() or StopLoadingSheet() (which was removed in Bug 556446). + // SheetLoadData::OnStreamComplete() checks this to avoid parsing + // sheets that have been cancelled and such. + bool mIsCancelled : 1; + + // mMustNotify is true if the load data is being loaded async and + // the original function call that started the load has returned. + // This applies only to observer notifications; load/error events + // are fired for any SheetLoadData that has a non-null + // mOwningElement. + bool mMustNotify : 1; + + // mWasAlternate is true if the sheet was an alternate when the load data was + // created. + bool mWasAlternate : 1; + + // mUseSystemPrincipal is true if the system principal should be used for + // this sheet, no matter what the channel principal is. Only true for sync + // loads. + bool mUseSystemPrincipal : 1; + + // If true, this SheetLoadData is being used as a way to handle + // async observer notification for an already-complete sheet. + bool mSheetAlreadyComplete : 1; + + // This is the element that imported the sheet. Needed to get the + // charset set on it and to fire load/error events. + nsCOMPtr<nsIStyleSheetLinkingElement> mOwningElement; + + // The observer that wishes to be notified of load completion + nsCOMPtr<nsICSSLoaderObserver> mObserver; + + // The principal that identifies who started loading us. + nsCOMPtr<nsIPrincipal> mLoaderPrincipal; + + // The node that identifies who started loading us. + nsCOMPtr<nsINode> mRequestingNode; + + // The charset to use if the transport and sheet don't indicate one. + // May be empty. Must be empty if mOwningElement is non-null. + nsCString mCharsetHint; + + // The status our load ended up with; this determines whether we + // should fire error events or load events. This gets initialized + // by ScheduleLoadEventIfNeeded, and is only used after that has + // been called. + MOZ_INIT_OUTSIDE_CTOR nsresult mStatus; + +private: + void FireLoadEvent(nsIThreadInternal* aThread); +}; + +#include "mozilla/Logging.h" + +static mozilla::LazyLogModule sCssLoaderLog("nsCSSLoader"); + +static mozilla::LazyLogModule gSriPRLog("SRI"); + +#define LOG_ERROR(args) MOZ_LOG(sCssLoaderLog, mozilla::LogLevel::Error, args) +#define LOG_WARN(args) MOZ_LOG(sCssLoaderLog, mozilla::LogLevel::Warning, args) +#define LOG_DEBUG(args) MOZ_LOG(sCssLoaderLog, mozilla::LogLevel::Debug, args) +#define LOG(args) LOG_DEBUG(args) + +#define LOG_ERROR_ENABLED() MOZ_LOG_TEST(sCssLoaderLog, mozilla::LogLevel::Error) +#define LOG_WARN_ENABLED() MOZ_LOG_TEST(sCssLoaderLog, mozilla::LogLevel::Warning) +#define LOG_DEBUG_ENABLED() MOZ_LOG_TEST(sCssLoaderLog, mozilla::LogLevel::Debug) +#define LOG_ENABLED() LOG_DEBUG_ENABLED() + +#define LOG_URI(format, uri) \ + PR_BEGIN_MACRO \ + NS_ASSERTION(uri, "Logging null uri"); \ + if (LOG_ENABLED()) { \ + LOG((format, uri->GetSpecOrDefault().get())); \ + } \ + PR_END_MACRO + +// And some convenience strings... +static const char* const gStateStrings[] = { + "eSheetStateUnknown", + "eSheetNeedsParser", + "eSheetPending", + "eSheetLoading", + "eSheetComplete" +}; + +/******************************** + * SheetLoadData implementation * + ********************************/ +NS_IMPL_ISUPPORTS(SheetLoadData, nsIUnicharStreamLoaderObserver, nsIRunnable, + nsIThreadObserver) + +SheetLoadData::SheetLoadData(Loader* aLoader, + const nsSubstring& aTitle, + nsIURI* aURI, + StyleSheet* aSheet, + nsIStyleSheetLinkingElement* aOwningElement, + bool aIsAlternate, + nsICSSLoaderObserver* aObserver, + nsIPrincipal* aLoaderPrincipal, + nsINode* aRequestingNode) + : mLoader(aLoader), + mTitle(aTitle), + mURI(aURI), + mLineNumber(1), + mSheet(aSheet), + mNext(nullptr), + mPendingChildren(0), + mSyncLoad(false), + mIsNonDocumentSheet(false), + mIsLoading(false), + mIsCancelled(false), + mMustNotify(false), + mWasAlternate(aIsAlternate), + mUseSystemPrincipal(false), + mSheetAlreadyComplete(false), + mOwningElement(aOwningElement), + mObserver(aObserver), + mLoaderPrincipal(aLoaderPrincipal), + mRequestingNode(aRequestingNode) +{ + NS_PRECONDITION(mLoader, "Must have a loader!"); +} + +SheetLoadData::SheetLoadData(Loader* aLoader, + nsIURI* aURI, + StyleSheet* aSheet, + SheetLoadData* aParentData, + nsICSSLoaderObserver* aObserver, + nsIPrincipal* aLoaderPrincipal, + nsINode* aRequestingNode) + : mLoader(aLoader), + mURI(aURI), + mLineNumber(1), + mSheet(aSheet), + mNext(nullptr), + mParentData(aParentData), + mPendingChildren(0), + mSyncLoad(false), + mIsNonDocumentSheet(false), + mIsLoading(false), + mIsCancelled(false), + mMustNotify(false), + mWasAlternate(false), + mUseSystemPrincipal(false), + mSheetAlreadyComplete(false), + mOwningElement(nullptr), + mObserver(aObserver), + mLoaderPrincipal(aLoaderPrincipal), + mRequestingNode(aRequestingNode) +{ + NS_PRECONDITION(mLoader, "Must have a loader!"); + if (mParentData) { + mSyncLoad = mParentData->mSyncLoad; + mIsNonDocumentSheet = mParentData->mIsNonDocumentSheet; + mUseSystemPrincipal = mParentData->mUseSystemPrincipal; + ++(mParentData->mPendingChildren); + } + + NS_POSTCONDITION(!mUseSystemPrincipal || mSyncLoad, + "Shouldn't use system principal for async loads"); +} + +SheetLoadData::SheetLoadData(Loader* aLoader, + nsIURI* aURI, + StyleSheet* aSheet, + bool aSyncLoad, + bool aUseSystemPrincipal, + const nsCString& aCharset, + nsICSSLoaderObserver* aObserver, + nsIPrincipal* aLoaderPrincipal, + nsINode* aRequestingNode) + : mLoader(aLoader), + mURI(aURI), + mLineNumber(1), + mSheet(aSheet), + mNext(nullptr), + mPendingChildren(0), + mSyncLoad(aSyncLoad), + mIsNonDocumentSheet(true), + mIsLoading(false), + mIsCancelled(false), + mMustNotify(false), + mWasAlternate(false), + mUseSystemPrincipal(aUseSystemPrincipal), + mSheetAlreadyComplete(false), + mOwningElement(nullptr), + mObserver(aObserver), + mLoaderPrincipal(aLoaderPrincipal), + mRequestingNode(aRequestingNode), + mCharsetHint(aCharset) +{ + NS_PRECONDITION(mLoader, "Must have a loader!"); + NS_POSTCONDITION(!mUseSystemPrincipal || mSyncLoad, + "Shouldn't use system principal for async loads"); +} + +SheetLoadData::~SheetLoadData() +{ + NS_CSS_NS_RELEASE_LIST_MEMBER(SheetLoadData, this, mNext); +} + +NS_IMETHODIMP +SheetLoadData::Run() +{ + mLoader->HandleLoadEvent(this); + return NS_OK; +} + +NS_IMETHODIMP +SheetLoadData::OnDispatchedEvent(nsIThreadInternal* aThread) +{ + return NS_OK; +} + +NS_IMETHODIMP +SheetLoadData::OnProcessNextEvent(nsIThreadInternal* aThread, + bool aMayWait) +{ + // XXXkhuey this is insane! + // We want to fire our load even before or after event processing, + // whichever comes first. + FireLoadEvent(aThread); + return NS_OK; +} + +NS_IMETHODIMP +SheetLoadData::AfterProcessNextEvent(nsIThreadInternal* aThread, + bool aEventWasProcessed) +{ + // XXXkhuey this too! + // We want to fire our load even before or after event processing, + // whichever comes first. + FireLoadEvent(aThread); + return NS_OK; +} + +void +SheetLoadData::FireLoadEvent(nsIThreadInternal* aThread) +{ + + // First remove ourselves as a thread observer. But we need to keep + // ourselves alive while doing that! + RefPtr<SheetLoadData> kungFuDeathGrip(this); + aThread->RemoveObserver(this); + + // Now fire the event + nsCOMPtr<nsINode> node = do_QueryInterface(mOwningElement); + NS_ASSERTION(node, "How did that happen???"); + + nsContentUtils::DispatchTrustedEvent(node->OwnerDoc(), + node, + NS_SUCCEEDED(mStatus) ? + NS_LITERAL_STRING("load") : + NS_LITERAL_STRING("error"), + false, false); + + // And unblock onload + if (mLoader->mDocument) { + mLoader->mDocument->UnblockOnload(true); + } +} + +void +SheetLoadData::ScheduleLoadEventIfNeeded(nsresult aStatus) +{ + if (!mOwningElement) { + return; + } + + mStatus = aStatus; + + nsCOMPtr<nsIThread> thread = do_GetMainThread(); + nsCOMPtr<nsIThreadInternal> internalThread = do_QueryInterface(thread); + if (NS_SUCCEEDED(internalThread->AddObserver(this))) { + // Make sure to block onload here + if (mLoader->mDocument) { + mLoader->mDocument->BlockOnload(); + } + } +} + +/********************* + * Style sheet reuse * + *********************/ + +bool +LoaderReusableStyleSheets::FindReusableStyleSheet(nsIURI* aURL, + RefPtr<CSSStyleSheet>& aResult) +{ + MOZ_ASSERT(aURL); + for (size_t i = mReusableSheets.Length(); i > 0; --i) { + size_t index = i - 1; + bool sameURI; + MOZ_ASSERT(mReusableSheets[index]->GetOriginalURI()); + nsresult rv = aURL->Equals(mReusableSheets[index]->GetOriginalURI(), + &sameURI); + if (!NS_FAILED(rv) && sameURI) { + aResult = mReusableSheets[index]; + mReusableSheets.RemoveElementAt(index); + return true; + } + } + return false; +} + +/************************* + * Loader Implementation * + *************************/ + +Loader::Loader(StyleBackendType aType) + : mDocument(nullptr) + , mDatasToNotifyOn(0) + , mCompatMode(eCompatibility_FullStandards) + , mStyleBackendType(Some(aType)) + , mEnabled(true) + , mReporter(new ConsoleReportCollector()) +#ifdef DEBUG + , mSyncCallback(false) +#endif +{ +} + +Loader::Loader(nsIDocument* aDocument) + : mDocument(aDocument) + , mDatasToNotifyOn(0) + , mCompatMode(eCompatibility_FullStandards) + , mEnabled(true) + , mReporter(new ConsoleReportCollector()) +#ifdef DEBUG + , mSyncCallback(false) +#endif +{ + // We can just use the preferred set, since there are no sheets in the + // document yet (if there are, how did they get there? _we_ load the sheets!) + // and hence the selected set makes no sense at this time. + nsCOMPtr<nsIDOMDocument> domDoc = do_QueryInterface(mDocument); + if (domDoc) { + domDoc->GetPreferredStyleSheetSet(mPreferredSheet); + } +} + +Loader::~Loader() +{ + NS_ASSERTION(!mSheets || mSheets->mLoadingDatas.Count() == 0, + "How did we get destroyed when there are loading data?"); + NS_ASSERTION(!mSheets || mSheets->mPendingDatas.Count() == 0, + "How did we get destroyed when there are pending data?"); + // Note: no real need to revoke our stylesheet loaded events -- they + // hold strong references to us, so if we're going away that means + // they're all done. +} + +void +Loader::DropDocumentReference(void) +{ + mDocument = nullptr; + // Flush out pending datas just so we don't leak by accident. These + // loads should short-circuit through the mDocument check in + // LoadSheet and just end up in SheetComplete immediately + if (mSheets) { + StartAlternateLoads(); + } +} + +nsresult +Loader::SetPreferredSheet(const nsAString& aTitle) +{ +#ifdef DEBUG + nsCOMPtr<nsIDOMDocument> doc = do_QueryInterface(mDocument); + if (doc) { + nsAutoString currentPreferred; + doc->GetLastStyleSheetSet(currentPreferred); + if (DOMStringIsNull(currentPreferred)) { + doc->GetPreferredStyleSheetSet(currentPreferred); + } + NS_ASSERTION(currentPreferred.Equals(aTitle), + "Unexpected argument to SetPreferredSheet"); + } +#endif + + mPreferredSheet = aTitle; + + // start any pending alternates that aren't alternates anymore + if (mSheets) { + LoadDataArray arr(mSheets->mPendingDatas.Count()); + for (auto iter = mSheets->mPendingDatas.Iter(); !iter.Done(); iter.Next()) { + SheetLoadData* data = iter.Data(); + MOZ_ASSERT(data, "Must have a data"); + + // Note that we don't want to affect what the selected style set is, so + // use true for aHasAlternateRel. + if (!data->mLoader->IsAlternate(data->mTitle, true)) { + arr.AppendElement(data); + iter.Remove(); + } + } + + mDatasToNotifyOn += arr.Length(); + for (uint32_t i = 0; i < arr.Length(); ++i) { + --mDatasToNotifyOn; + LoadSheet(arr[i], eSheetNeedsParser, false); + } + } + + return NS_OK; +} + +static const char kCharsetSym[] = "@charset \""; + +static bool GetCharsetFromData(const char* aStyleSheetData, + uint32_t aDataLength, + nsACString& aCharset) +{ + aCharset.Truncate(); + if (aDataLength <= sizeof(kCharsetSym) - 1) + return false; + + if (strncmp(aStyleSheetData, + kCharsetSym, + sizeof(kCharsetSym) - 1)) { + return false; + } + + for (uint32_t i = sizeof(kCharsetSym) - 1; i < aDataLength; ++i) { + char c = aStyleSheetData[i]; + if (c == '"') { + ++i; + if (i < aDataLength && aStyleSheetData[i] == ';') { + return true; + } + // fail + break; + } + aCharset.Append(c); + } + + // Did not see end quote or semicolon + aCharset.Truncate(); + return false; +} + +NS_IMETHODIMP +SheetLoadData::OnDetermineCharset(nsIUnicharStreamLoader* aLoader, + nsISupports* aContext, + nsACString const& aSegment, + nsACString& aCharset) +{ + NS_PRECONDITION(!mOwningElement || mCharsetHint.IsEmpty(), + "Can't have element _and_ charset hint"); + + LOG_URI("SheetLoadData::OnDetermineCharset for '%s'", mURI); + + // The precedence is (per CSS3 Syntax 2012-11-08 ED): + // BOM + // Channel + // @charset rule + // charset attribute on the referrer + // encoding of the referrer + // UTF-8 + + aCharset.Truncate(); + + if (nsContentUtils::CheckForBOM((const unsigned char*)aSegment.BeginReading(), + aSegment.Length(), + aCharset)) { + // aCharset is now either "UTF-16BE", "UTF-16BE" or "UTF-8" + // which will swallow the BOM. + mCharset.Assign(aCharset); + LOG((" Setting from BOM to: %s", PromiseFlatCString(aCharset).get())); + return NS_OK; + } + + nsCOMPtr<nsIChannel> channel; + nsAutoCString specified; + aLoader->GetChannel(getter_AddRefs(channel)); + if (channel) { + channel->GetContentCharset(specified); + if (EncodingUtils::FindEncodingForLabel(specified, aCharset)) { + mCharset.Assign(aCharset); + LOG((" Setting from HTTP to: %s", PromiseFlatCString(aCharset).get())); + return NS_OK; + } + } + + if (GetCharsetFromData(aSegment.BeginReading(), + aSegment.Length(), + specified)) { + if (EncodingUtils::FindEncodingForLabel(specified, aCharset)) { + // FindEncodingForLabel currently never returns UTF-16LE but will + // probably change to never return UTF-16 instead, so check both here + // to avoid relying on the exact behavior. + if (aCharset.EqualsLiteral("UTF-16") || + aCharset.EqualsLiteral("UTF-16BE") || + aCharset.EqualsLiteral("UTF-16LE")) { + // Be consistent with HTML <meta> handling in face of impossibility. + // When the @charset rule itself evidently was not UTF-16-encoded, + // it saying UTF-16 has to be a lie. + aCharset.AssignLiteral("UTF-8"); + } + mCharset.Assign(aCharset); + LOG((" Setting from @charset rule to: %s", + PromiseFlatCString(aCharset).get())); + return NS_OK; + } + } + + // Now try the charset on the <link> or processing instruction + // that loaded us + if (mOwningElement) { + nsAutoString specified16; + mOwningElement->GetCharset(specified16); + if (EncodingUtils::FindEncodingForLabel(specified16, aCharset)) { + mCharset.Assign(aCharset); + LOG((" Setting from charset attribute to: %s", + PromiseFlatCString(aCharset).get())); + return NS_OK; + } + } + + // In the preload case, the value of the charset attribute on <link> comes + // in via mCharsetHint instead. + if (EncodingUtils::FindEncodingForLabel(mCharsetHint, aCharset)) { + mCharset.Assign(aCharset); + LOG((" Setting from charset attribute (preload case) to: %s", + PromiseFlatCString(aCharset).get())); + return NS_OK; + } + + // Try charset from the parent stylesheet. + if (mParentData) { + aCharset = mParentData->mCharset; + if (!aCharset.IsEmpty()) { + mCharset.Assign(aCharset); + LOG((" Setting from parent sheet to: %s", + PromiseFlatCString(aCharset).get())); + return NS_OK; + } + } + + if (mLoader->mDocument) { + // no useful data on charset. Try the document charset. + aCharset = mLoader->mDocument->GetDocumentCharacterSet(); + MOZ_ASSERT(!aCharset.IsEmpty()); + mCharset.Assign(aCharset); + LOG((" Setting from document to: %s", PromiseFlatCString(aCharset).get())); + return NS_OK; + } + + aCharset.AssignLiteral("UTF-8"); + mCharset = aCharset; + LOG((" Setting from default to: %s", PromiseFlatCString(aCharset).get())); + return NS_OK; +} + +already_AddRefed<nsIURI> +SheetLoadData::GetReferrerURI() +{ + nsCOMPtr<nsIURI> uri; + if (mParentData) + uri = mParentData->mSheet->GetSheetURI(); + if (!uri && mLoader->mDocument) + uri = mLoader->mDocument->GetDocumentURI(); + return uri.forget(); +} + +/* + * Here we need to check that the load did not give us an http error + * page and check the mimetype on the channel to make sure we're not + * loading non-text/css data in standards mode. + */ +NS_IMETHODIMP +SheetLoadData::OnStreamComplete(nsIUnicharStreamLoader* aLoader, + nsISupports* aContext, + nsresult aStatus, + const nsAString& aBuffer) +{ + LOG(("SheetLoadData::OnStreamComplete")); + NS_ASSERTION(!mLoader->mSyncCallback, "Synchronous callback from necko"); + + if (mIsCancelled) { + // Just return. Don't call SheetComplete -- it's already been + // called and calling it again will lead to an extra NS_RELEASE on + // this data and a likely crash. + return NS_OK; + } + + if (!mLoader->mDocument && !mIsNonDocumentSheet) { + // Sorry, we don't care about this load anymore + LOG_WARN((" No document and not non-document sheet; dropping load")); + mLoader->SheetComplete(this, NS_BINDING_ABORTED); + return NS_OK; + } + + if (NS_FAILED(aStatus)) { + LOG_WARN((" Load failed: status 0x%x", aStatus)); + // Handle sheet not loading error because source was a tracking URL. + // We make a note of this sheet node by including it in a dedicated + // array of blocked tracking nodes under its parent document. + // + // Multiple sheet load instances might be tied to this request, + // we annotate each one linked to a valid owning element (node). + if (aStatus == NS_ERROR_TRACKING_URI) { + nsIDocument* doc = mLoader->GetDocument(); + if (doc) { + for (SheetLoadData* data = this; data; data = data->mNext) { + // mOwningElement may be null but AddBlockTrackingNode can cope + nsCOMPtr<nsIContent> content = do_QueryInterface(data->mOwningElement); + doc->AddBlockedTrackingNode(content); + } + } + } + mLoader->SheetComplete(this, aStatus); + return NS_OK; + } + + nsCOMPtr<nsIChannel> channel; + nsresult result = aLoader->GetChannel(getter_AddRefs(channel)); + if (NS_FAILED(result)) { + LOG_WARN((" No channel from loader")); + mLoader->SheetComplete(this, result); + return NS_OK; + } + + nsCOMPtr<nsIURI> originalURI; + channel->GetOriginalURI(getter_AddRefs(originalURI)); + + // If the channel's original URI is "chrome:", we want that, since + // the observer code in nsXULPrototypeCache depends on chrome stylesheets + // having a chrome URI. (Whether or not chrome stylesheets come through + // this codepath seems nondeterministic.) + // Otherwise we want the potentially-HTTP-redirected URI. + nsCOMPtr<nsIURI> channelURI; + NS_GetFinalChannelURI(channel, getter_AddRefs(channelURI)); + + if (!channelURI || !originalURI) { + NS_ERROR("Someone just violated the nsIRequest contract"); + LOG_WARN((" Channel without a URI. Bad!")); + mLoader->SheetComplete(this, NS_ERROR_UNEXPECTED); + return NS_OK; + } + + nsCOMPtr<nsIPrincipal> principal; + nsIScriptSecurityManager* secMan = nsContentUtils::GetSecurityManager(); + result = NS_ERROR_NOT_AVAILABLE; + if (secMan) { // Could be null if we already shut down + if (mUseSystemPrincipal) { + result = secMan->GetSystemPrincipal(getter_AddRefs(principal)); + } else { + result = secMan->GetChannelResultPrincipal(channel, getter_AddRefs(principal)); + } + } + + if (NS_FAILED(result)) { + LOG_WARN((" Couldn't get principal")); + mLoader->SheetComplete(this, result); + return NS_OK; + } + + mSheet->SetPrincipal(principal); + + // If it's an HTTP channel, we want to make sure this is not an + // error document we got. + nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(channel)); + if (httpChannel) { + bool requestSucceeded; + result = httpChannel->GetRequestSucceeded(&requestSucceeded); + if (NS_SUCCEEDED(result) && !requestSucceeded) { + LOG((" Load returned an error page")); + mLoader->SheetComplete(this, NS_ERROR_NOT_AVAILABLE); + return NS_OK; + } + } + + nsAutoCString contentType; + if (channel) { + channel->GetContentType(contentType); + } + + // In standards mode, a style sheet must have one of these MIME + // types to be processed at all. In quirks mode, we accept any + // MIME type, but only if the style sheet is same-origin with the + // requesting document or parent sheet. See bug 524223. + + bool validType = contentType.EqualsLiteral("text/css") || + contentType.EqualsLiteral(UNKNOWN_CONTENT_TYPE) || + contentType.IsEmpty(); + + if (!validType) { + const char *errorMessage; + uint32_t errorFlag; + bool sameOrigin = true; + + if (mLoaderPrincipal) { + bool subsumed; + result = mLoaderPrincipal->Subsumes(principal, &subsumed); + if (NS_FAILED(result) || !subsumed) { + sameOrigin = false; + } + } + + if (sameOrigin && mLoader->mCompatMode == eCompatibility_NavQuirks) { + errorMessage = "MimeNotCssWarn"; + errorFlag = nsIScriptError::warningFlag; + } else { + errorMessage = "MimeNotCss"; + errorFlag = nsIScriptError::errorFlag; + } + + const nsAFlatString& specUTF16 = + NS_ConvertUTF8toUTF16(channelURI->GetSpecOrDefault()); + const nsAFlatString& ctypeUTF16 = NS_ConvertASCIItoUTF16(contentType); + const char16_t *strings[] = { specUTF16.get(), ctypeUTF16.get() }; + + nsCOMPtr<nsIURI> referrer = GetReferrerURI(); + nsContentUtils::ReportToConsole(errorFlag, + NS_LITERAL_CSTRING("CSS Loader"), + mLoader->mDocument, + nsContentUtils::eCSS_PROPERTIES, + errorMessage, + strings, ArrayLength(strings), + referrer); + + if (errorFlag == nsIScriptError::errorFlag) { + LOG_WARN((" Ignoring sheet with improper MIME type %s", + contentType.get())); + mLoader->SheetComplete(this, NS_ERROR_NOT_AVAILABLE); + return NS_OK; + } + } + + SRIMetadata sriMetadata; + mSheet->GetIntegrity(sriMetadata); + if (sriMetadata.IsEmpty()) { + nsCOMPtr<nsILoadInfo> loadInfo = channel->GetLoadInfo(); + if (loadInfo->GetEnforceSRI()) { + LOG((" Load was blocked by SRI")); + MOZ_LOG(gSriPRLog, mozilla::LogLevel::Debug, + ("css::Loader::OnStreamComplete, required SRI not found")); + mLoader->SheetComplete(this, NS_ERROR_SRI_CORRUPT); + // log the failed load to web console + nsCOMPtr<nsIContentSecurityPolicy> csp; + loadInfo->LoadingPrincipal()->GetCsp(getter_AddRefs(csp)); + nsAutoCString spec; + mLoader->mDocument->GetDocumentURI()->GetAsciiSpec(spec); + // line number unknown. mRequestingNode doesn't bear this info. + csp->LogViolationDetails( + nsIContentSecurityPolicy::VIOLATION_TYPE_REQUIRE_SRI_FOR_STYLE, + NS_ConvertUTF8toUTF16(spec), EmptyString(), + 0, EmptyString(), EmptyString()); + return NS_OK; + } + } else { + nsAutoCString sourceUri; + if (mLoader->mDocument && mLoader->mDocument->GetDocumentURI()) { + mLoader->mDocument->GetDocumentURI()->GetAsciiSpec(sourceUri); + } + nsresult rv = SRICheck::VerifyIntegrity(sriMetadata, aLoader, aBuffer, + sourceUri, mLoader->mReporter); + mLoader->mReporter->FlushConsoleReports(mLoader->mDocument); + if (NS_FAILED(rv)) { + LOG((" Load was blocked by SRI")); + MOZ_LOG(gSriPRLog, mozilla::LogLevel::Debug, + ("css::Loader::OnStreamComplete, bad metadata")); + mLoader->SheetComplete(this, NS_ERROR_SRI_CORRUPT); + return NS_OK; + } + } + + // Enough to set the URIs on mSheet, since any sibling datas we have share + // the same mInner as mSheet and will thus get the same URI. + mSheet->SetURIs(channelURI, originalURI, channelURI); + + bool completed; + result = mLoader->ParseSheet(aBuffer, this, completed); + NS_ASSERTION(completed || !mSyncLoad, "sync load did not complete"); + return result; +} + +bool +Loader::IsAlternate(const nsAString& aTitle, bool aHasAlternateRel) +{ + // A sheet is alternate if it has a nonempty title that doesn't match the + // currently selected style set. But if there _is_ no currently selected + // style set, the sheet wasn't marked as an alternate explicitly, and aTitle + // is nonempty, we should select the style set corresponding to aTitle, since + // that's a preferred sheet. + if (aTitle.IsEmpty()) { + return false; + } + + if (!aHasAlternateRel && mDocument && mPreferredSheet.IsEmpty()) { + // There's no preferred set yet, and we now have a sheet with a title. + // Make that be the preferred set. + mDocument->SetHeaderData(nsGkAtoms::headerDefaultStyle, aTitle); + // We're definitely not an alternate + return false; + } + + return !aTitle.Equals(mPreferredSheet); +} + +nsresult +Loader::ObsoleteSheet(nsIURI* aURI) +{ + if (!mSheets) { + return NS_OK; + } + if (!aURI) { + return NS_ERROR_INVALID_ARG; + } + for (auto iter = mSheets->mCompleteSheets.Iter(); !iter.Done(); iter.Next()) { + nsIURI* sheetURI = iter.Key()->GetURI(); + bool areEqual; + nsresult rv = sheetURI->Equals(aURI, &areEqual); + if (NS_SUCCEEDED(rv) && areEqual) { + iter.Remove(); + } + } + return NS_OK; +} + +nsresult +Loader::CheckContentPolicy(nsIPrincipal* aSourcePrincipal, + nsIURI* aTargetURI, + nsISupports* aContext, + bool aIsPreload) +{ + // When performing a system load (e.g. aUseSystemPrincipal = true) + // then aSourcePrincipal == null; don't consult content policies. + if (!aSourcePrincipal) { + return NS_OK; + } + + nsContentPolicyType contentPolicyType = + aIsPreload ? nsIContentPolicy::TYPE_INTERNAL_STYLESHEET_PRELOAD + : nsIContentPolicy::TYPE_INTERNAL_STYLESHEET; + + int16_t shouldLoad = nsIContentPolicy::ACCEPT; + nsresult rv = NS_CheckContentLoadPolicy(contentPolicyType, + aTargetURI, + aSourcePrincipal, + aContext, + NS_LITERAL_CSTRING("text/css"), + nullptr, //extra param + &shouldLoad, + nsContentUtils::GetContentPolicy(), + nsContentUtils::GetSecurityManager()); + if (NS_FAILED(rv) || NS_CP_REJECTED(shouldLoad)) { + return NS_ERROR_CONTENT_BLOCKED; + } + return NS_OK; +} + +/** + * CreateSheet() creates a CSSStyleSheet object for the given URI, + * if any. If there is no URI given, we just create a new style sheet + * object. Otherwise, we check for an existing style sheet object for + * that uri in various caches and clone it if we find it. Cloned + * sheets will have the title/media/enabled state of the sheet they + * are clones off; make sure to call PrepareSheet() on the result of + * CreateSheet(). + */ +nsresult +Loader::CreateSheet(nsIURI* aURI, + nsIContent* aLinkingContent, + nsIPrincipal* aLoaderPrincipal, + css::SheetParsingMode aParsingMode, + CORSMode aCORSMode, + ReferrerPolicy aReferrerPolicy, + const nsAString& aIntegrity, + bool aSyncLoad, + bool aHasAlternateRel, + const nsAString& aTitle, + StyleSheetState& aSheetState, + bool *aIsAlternate, + RefPtr<StyleSheet>* aSheet) +{ + LOG(("css::Loader::CreateSheet")); + NS_PRECONDITION(aSheet, "Null out param!"); + + if (!mSheets) { + mSheets = new Sheets(); + } + + *aSheet = nullptr; + aSheetState = eSheetStateUnknown; + + // Check the alternate state before doing anything else, because it + // can mess with our hashtables. + *aIsAlternate = IsAlternate(aTitle, aHasAlternateRel); + + // XXXheycam Cached sheets currently must be CSSStyleSheets. + if (aURI && GetStyleBackendType() == StyleBackendType::Gecko) { + aSheetState = eSheetComplete; + RefPtr<StyleSheet> sheet; + + // First, the XUL cache +#ifdef MOZ_XUL + if (IsChromeURI(aURI)) { + nsXULPrototypeCache* cache = nsXULPrototypeCache::GetInstance(); + if (cache) { + if (cache->IsEnabled()) { + sheet = cache->GetStyleSheet(aURI); + LOG((" From XUL cache: %p", sheet.get())); + } + } + } +#endif + + bool fromCompleteSheets = false; + if (!sheet) { + // Then our per-document complete sheets. + URIPrincipalReferrerPolicyAndCORSModeHashKey key(aURI, aLoaderPrincipal, aCORSMode, aReferrerPolicy); + + StyleSheet* completeSheet = nullptr; + mSheets->mCompleteSheets.Get(&key, &completeSheet); + sheet = completeSheet; + LOG((" From completed: %p", sheet.get())); + + fromCompleteSheets = !!sheet; + } + + if (sheet) { + if (sheet->IsServo()) { + MOZ_CRASH("stylo: can't clone ServoStyleSheets yet"); + } + + // This sheet came from the XUL cache or our per-document hashtable; it + // better be a complete sheet. + NS_ASSERTION(sheet->AsGecko()->IsComplete(), + "Sheet thinks it's not complete while we think it is"); + + // Make sure it hasn't been modified; if it has, we can't use it + if (sheet->AsGecko()->IsModified()) { + LOG((" Not cloning completed sheet %p because it's been modified", + sheet.get())); + sheet = nullptr; + fromCompleteSheets = false; + } + } + + // Then loading sheets + if (!sheet && !aSyncLoad) { + aSheetState = eSheetLoading; + SheetLoadData* loadData = nullptr; + URIPrincipalReferrerPolicyAndCORSModeHashKey key(aURI, aLoaderPrincipal, aCORSMode, aReferrerPolicy); + mSheets->mLoadingDatas.Get(&key, &loadData); + if (loadData) { + sheet = loadData->mSheet; + LOG((" From loading: %p", sheet.get())); + +#ifdef DEBUG + bool debugEqual; + NS_ASSERTION((!aLoaderPrincipal && !loadData->mLoaderPrincipal) || + (aLoaderPrincipal && loadData->mLoaderPrincipal && + NS_SUCCEEDED(aLoaderPrincipal-> + Equals(loadData->mLoaderPrincipal, + &debugEqual)) && debugEqual), + "Principals should be the same"); +#endif + } + + // Then alternate sheets + if (!sheet) { + aSheetState = eSheetPending; + loadData = nullptr; + mSheets->mPendingDatas.Get(&key, &loadData); + if (loadData) { + sheet = loadData->mSheet; + LOG((" From pending: %p", sheet.get())); + +#ifdef DEBUG + bool debugEqual; + NS_ASSERTION((!aLoaderPrincipal && !loadData->mLoaderPrincipal) || + (aLoaderPrincipal && loadData->mLoaderPrincipal && + NS_SUCCEEDED(aLoaderPrincipal-> + Equals(loadData->mLoaderPrincipal, + &debugEqual)) && debugEqual), + "Principals should be the same"); +#endif + } + } + } + + if (sheet) { + // The sheet we have now should be either incomplete or unmodified + if (sheet->IsServo()) { + MOZ_CRASH("stylo: can't clone ServoStyleSheets yet"); + } + NS_ASSERTION(!sheet->AsGecko()->IsModified() || + !sheet->AsGecko()->IsComplete(), + "Unexpected modified complete sheet"); + NS_ASSERTION(sheet->AsGecko()->IsComplete() || + aSheetState != eSheetComplete, + "Sheet thinks it's not complete while we think it is"); + + RefPtr<CSSStyleSheet> clonedSheet = + sheet->AsGecko()->Clone(nullptr, nullptr, nullptr, nullptr); + *aSheet = Move(clonedSheet); + if (*aSheet && fromCompleteSheets && + !sheet->AsGecko()->GetOwnerNode() && + !sheet->AsGecko()->GetParentSheet()) { + // The sheet we're cloning isn't actually referenced by + // anyone. Replace it in the cache, so that if our CSSOM is + // later modified we don't end up with two copies of our inner + // hanging around. + URIPrincipalReferrerPolicyAndCORSModeHashKey key(aURI, aLoaderPrincipal, aCORSMode, aReferrerPolicy); + NS_ASSERTION((*aSheet)->AsGecko()->IsComplete(), + "Should only be caching complete sheets"); + mSheets->mCompleteSheets.Put(&key, *aSheet); + } + } + } + + if (!*aSheet) { + aSheetState = eSheetNeedsParser; + nsIURI *sheetURI; + nsCOMPtr<nsIURI> baseURI; + nsIURI* originalURI; + if (!aURI) { + // Inline style. Use the document's base URL so that @import in + // the inline sheet picks up the right base. + NS_ASSERTION(aLinkingContent, "Inline stylesheet without linking content?"); + baseURI = aLinkingContent->GetBaseURI(); + sheetURI = aLinkingContent->OwnerDoc()->GetDocumentURI(); + originalURI = nullptr; + } else { + baseURI = aURI; + sheetURI = aURI; + originalURI = aURI; + } + + SRIMetadata sriMetadata; + if (!aIntegrity.IsEmpty()) { + MOZ_LOG(gSriPRLog, mozilla::LogLevel::Debug, + ("css::Loader::CreateSheet, integrity=%s", + NS_ConvertUTF16toUTF8(aIntegrity).get())); + nsAutoCString sourceUri; + if (mDocument && mDocument->GetDocumentURI()) { + mDocument->GetDocumentURI()->GetAsciiSpec(sourceUri); + } + SRICheck::IntegrityMetadata(aIntegrity, sourceUri, mReporter, + &sriMetadata); + } + + if (GetStyleBackendType() == StyleBackendType::Gecko) { + *aSheet = new CSSStyleSheet(aParsingMode, aCORSMode, aReferrerPolicy, sriMetadata); + } else { + *aSheet = new ServoStyleSheet(aParsingMode, aCORSMode, aReferrerPolicy, sriMetadata); + } + (*aSheet)->SetURIs(sheetURI, originalURI, baseURI); + } + + NS_ASSERTION(*aSheet, "We should have a sheet by now!"); + NS_ASSERTION(aSheetState != eSheetStateUnknown, "Have to set a state!"); + LOG((" State: %s", gStateStrings[aSheetState])); + + return NS_OK; +} + +/** + * PrepareSheet() handles setting the media and title on the sheet, as + * well as setting the enabled state based on the title and whether + * the sheet had "alternate" in its rel. + */ +void +Loader::PrepareSheet(StyleSheet* aSheet, + const nsSubstring& aTitle, + const nsSubstring& aMediaString, + nsMediaList* aMediaList, + Element* aScopeElement, + bool isAlternate) +{ + NS_PRECONDITION(aSheet, "Must have a sheet!"); + + // XXXheycam Need to set media, title, etc. on ServoStyleSheets. + if (aSheet->IsServo()) { + NS_WARNING("stylo: should set metadata on ServoStyleSheets. See bug 1290209."); + return; + } + + CSSStyleSheet* sheet = aSheet->AsGecko(); + + RefPtr<nsMediaList> mediaList(aMediaList); + + if (!aMediaString.IsEmpty()) { + NS_ASSERTION(!aMediaList, + "must not provide both aMediaString and aMediaList"); + mediaList = new nsMediaList(); + + nsCSSParser mediumParser(this); + + // We have aMediaString only when linked from link elements, style + // elements, or PIs, so pass true. + mediumParser.ParseMediaList(aMediaString, nullptr, 0, mediaList, true); + } + + sheet->SetMedia(mediaList); + + sheet->SetTitle(aTitle); + sheet->SetEnabled(!isAlternate); + sheet->SetScopeElement(aScopeElement); +} + +/** + * InsertSheetInDoc handles ordering of sheets in the document. Here + * we have two types of sheets -- those with linking elements and + * those without. The latter are loaded by Link: headers. + * The following constraints are observed: + * 1) Any sheet with a linking element comes after all sheets without + * linking elements + * 2) Sheets without linking elements are inserted in the order in + * which the inserting requests come in, since all of these are + * inserted during header data processing in the content sink + * 3) Sheets with linking elements are ordered based on document order + * as determined by CompareDocumentPosition. + */ +nsresult +Loader::InsertSheetInDoc(StyleSheet* aSheet, + nsIContent* aLinkingContent, + nsIDocument* aDocument) +{ + LOG(("css::Loader::InsertSheetInDoc")); + NS_PRECONDITION(aSheet, "Nothing to insert"); + NS_PRECONDITION(aDocument, "Must have a document to insert into"); + + // XXX Need to cancel pending sheet loads for this element, if any + + int32_t sheetCount = aDocument->GetNumberOfStyleSheets(); + + /* + * Start the walk at the _end_ of the list, since in the typical + * case we'll just want to append anyway. We want to break out of + * the loop when insertionPoint points to just before the index we + * want to insert at. In other words, when we leave the loop + * insertionPoint is the index of the stylesheet that immediately + * precedes the one we're inserting. + */ + int32_t insertionPoint; + for (insertionPoint = sheetCount - 1; insertionPoint >= 0; --insertionPoint) { + StyleSheet* curSheet = aDocument->GetStyleSheetAt(insertionPoint); + NS_ASSERTION(curSheet, "There must be a sheet here!"); + nsCOMPtr<nsINode> sheetOwner = curSheet->GetOwnerNode(); + if (sheetOwner && !aLinkingContent) { + // Keep moving; all sheets with a sheetOwner come after all + // sheets without a linkingNode + continue; + } + + if (!sheetOwner) { + // Aha! The current sheet has no sheet owner, so we want to + // insert after it no matter whether we have a linkingNode + break; + } + + NS_ASSERTION(aLinkingContent != sheetOwner, + "Why do we still have our old sheet?"); + + // Have to compare + if (nsContentUtils::PositionIsBefore(sheetOwner, aLinkingContent)) { + // The current sheet comes before us, and it better be the first + // such, because now we break + break; + } + } + + ++insertionPoint; // adjust the index to the spot we want to insert in + + // XXX <meta> elements do not implement nsIStyleSheetLinkingElement; + // need to fix this for them to be ordered correctly. + nsCOMPtr<nsIStyleSheetLinkingElement> + linkingElement = do_QueryInterface(aLinkingContent); + if (linkingElement) { + linkingElement->SetStyleSheet(aSheet); // This sets the ownerNode on the sheet + } + + aDocument->BeginUpdate(UPDATE_STYLE); + aDocument->InsertStyleSheetAt(aSheet, insertionPoint); + aDocument->EndUpdate(UPDATE_STYLE); + LOG((" Inserting into document at position %d", insertionPoint)); + + return NS_OK; +} + +/** + * InsertChildSheet handles ordering of @import-ed sheet in their + * parent sheets. Here we want to just insert based on order of the + * @import rules that imported the sheets. In theory we can't just + * append to the end because the CSSOM can insert @import rules. In + * practice, we get the call to load the child sheet before the CSSOM + * has finished inserting the @import rule, so we have no idea where + * to put it anyway. So just append for now. (In the future if we + * want to insert the sheet at the correct position, we'll need to + * restore CSSStyleSheet::InsertStyleSheetAt, which was removed in + * bug 1220506.) + */ +nsresult +Loader::InsertChildSheet(StyleSheet* aSheet, + StyleSheet* aParentSheet, + ImportRule* aParentRule) +{ + LOG(("css::Loader::InsertChildSheet")); + NS_PRECONDITION(aSheet, "Nothing to insert"); + NS_PRECONDITION(aParentSheet, "Need a parent to insert into"); + NS_PRECONDITION(aParentSheet, "How did we get imported?"); + + // XXXheycam The InsertChildSheet API doesn't work with ServoStyleSheets, + // since they won't have Gecko ImportRules in them. + if (aSheet->IsServo()) { + return NS_ERROR_FAILURE; + } + + // child sheets should always start out enabled, even if they got + // cloned off of top-level sheets which were disabled + aSheet->AsGecko()->SetEnabled(true); + + aParentSheet->AppendStyleSheet(aSheet); + aParentRule->SetSheet(aSheet->AsGecko()); // This sets the ownerRule on the sheet + + LOG((" Inserting into parent sheet")); + // LOG((" Inserting into parent sheet at position %d", insertionPoint)); + + return NS_OK; +} + +/** + * LoadSheet handles the actual load of a sheet. If the load is + * supposed to be synchronous it just opens a channel synchronously + * using the given uri, wraps the resulting stream in a converter + * stream and calls ParseSheet. Otherwise it tries to look for an + * existing load for this URI and piggyback on it. Failing all that, + * a new load is kicked off asynchronously. + */ +nsresult +Loader::LoadSheet(SheetLoadData* aLoadData, + StyleSheetState aSheetState, + bool aIsPreload) +{ + LOG(("css::Loader::LoadSheet")); + NS_PRECONDITION(aLoadData, "Need a load data"); + NS_PRECONDITION(aLoadData->mURI, "Need a URI to load"); + NS_PRECONDITION(aLoadData->mSheet, "Need a sheet to load into"); + NS_PRECONDITION(aSheetState != eSheetComplete, "Why bother?"); + NS_PRECONDITION(!aLoadData->mUseSystemPrincipal || aLoadData->mSyncLoad, + "Shouldn't use system principal for async loads"); + NS_ASSERTION(mSheets, "mLoadingDatas should be initialized by now."); + + LOG_URI(" Load from: '%s'", aLoadData->mURI); + + nsresult rv = NS_OK; + + if (!mDocument && !aLoadData->mIsNonDocumentSheet) { + // No point starting the load; just release all the data and such. + LOG_WARN((" No document and not non-document sheet; pre-dropping load")); + SheetComplete(aLoadData, NS_BINDING_ABORTED); + return NS_BINDING_ABORTED; + } + + SRIMetadata sriMetadata; + aLoadData->mSheet->GetIntegrity(sriMetadata); + + if (aLoadData->mSyncLoad) { + LOG((" Synchronous load")); + NS_ASSERTION(!aLoadData->mObserver, "Observer for a sync load?"); + NS_ASSERTION(aSheetState == eSheetNeedsParser, + "Sync loads can't reuse existing async loads"); + + // Create a nsIUnicharStreamLoader instance to which we will feed + // the data from the sync load. Do this before creating the + // channel to make error recovery simpler. + nsCOMPtr<nsIUnicharStreamLoader> streamLoader; + rv = NS_NewUnicharStreamLoader(getter_AddRefs(streamLoader), aLoadData); + if (NS_FAILED(rv)) { + LOG_ERROR((" Failed to create stream loader for sync load")); + SheetComplete(aLoadData, rv); + return rv; + } + + if (mDocument) { + mozilla::net::PredictorLearn(aLoadData->mURI, mDocument->GetDocumentURI(), + nsINetworkPredictor::LEARN_LOAD_SUBRESOURCE, + mDocument); + } + + nsSecurityFlags securityFlags = + nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_INHERITS | + nsILoadInfo::SEC_ALLOW_CHROME; + + nsContentPolicyType contentPolicyType = + aIsPreload ? nsIContentPolicy::TYPE_INTERNAL_STYLESHEET_PRELOAD + : nsIContentPolicy::TYPE_INTERNAL_STYLESHEET; + + // Just load it + nsCOMPtr<nsIChannel> channel; + // Note that we are calling NS_NewChannelWithTriggeringPrincipal() with both + // a node and a principal. + // This is because of a case where the node is the document being styled and + // the principal is the stylesheet (perhaps from a different origin) that is + // applying the styles. + if (aLoadData->mRequestingNode && aLoadData->mLoaderPrincipal) { + rv = NS_NewChannelWithTriggeringPrincipal(getter_AddRefs(channel), + aLoadData->mURI, + aLoadData->mRequestingNode, + aLoadData->mLoaderPrincipal, + securityFlags, + contentPolicyType); + } + else { + // either we are loading something inside a document, in which case + // we should always have a requestingNode, or we are loading something + // outside a document, in which case the loadingPrincipal and the + // triggeringPrincipal should always be the systemPrincipal. + rv = NS_NewChannel(getter_AddRefs(channel), + aLoadData->mURI, + nsContentUtils::GetSystemPrincipal(), + securityFlags, + contentPolicyType); + } + if (NS_FAILED(rv)) { + LOG_ERROR((" Failed to create channel")); + SheetComplete(aLoadData, rv); + return rv; + } + + nsCOMPtr<nsIInputStream> stream; + rv = channel->Open2(getter_AddRefs(stream)); + + if (NS_FAILED(rv)) { + LOG_ERROR((" Failed to open URI synchronously")); + SheetComplete(aLoadData, rv); + return rv; + } + + // Force UA sheets to be UTF-8. + // XXX this is only necessary because the default in + // SheetLoadData::OnDetermineCharset is wrong (bug 521039). + channel->SetContentCharset(NS_LITERAL_CSTRING("UTF-8")); + + // Manually feed the streamloader the contents of the stream. + // This will call back into OnStreamComplete + // and thence to ParseSheet. Regardless of whether this fails, + // SheetComplete has been called. + return nsSyncLoadService::PushSyncStreamToListener(stream, + streamLoader, + channel); + } + + SheetLoadData* existingData = nullptr; + + URIPrincipalReferrerPolicyAndCORSModeHashKey key(aLoadData->mURI, + aLoadData->mLoaderPrincipal, + aLoadData->mSheet->GetCORSMode(), + aLoadData->mSheet->GetReferrerPolicy()); + if (aSheetState == eSheetLoading) { + mSheets->mLoadingDatas.Get(&key, &existingData); + NS_ASSERTION(existingData, "CreateSheet lied about the state"); + } + else if (aSheetState == eSheetPending){ + mSheets->mPendingDatas.Get(&key, &existingData); + NS_ASSERTION(existingData, "CreateSheet lied about the state"); + } + + if (existingData) { + LOG((" Glomming on to existing load")); + SheetLoadData* data = existingData; + while (data->mNext) { + data = data->mNext; + } + data->mNext = aLoadData; // transfer ownership + if (aSheetState == eSheetPending && !aLoadData->mWasAlternate) { + // Kick the load off; someone cares about it right away + +#ifdef DEBUG + SheetLoadData* removedData; + NS_ASSERTION(mSheets->mPendingDatas.Get(&key, &removedData) && + removedData == existingData, + "Bad pending table."); +#endif + + mSheets->mPendingDatas.Remove(&key); + + LOG((" Forcing load of pending data")); + return LoadSheet(existingData, eSheetNeedsParser, aIsPreload); + } + // All done here; once the load completes we'll be marked complete + // automatically + return NS_OK; + } + + nsCOMPtr<nsILoadGroup> loadGroup; + if (mDocument) { + loadGroup = mDocument->GetDocumentLoadGroup(); + // load for a document with no loadgrup indicates that something is + // completely bogus, let's bail out early. + if (!loadGroup) { + LOG_ERROR((" Failed to query loadGroup from document")); + SheetComplete(aLoadData, NS_ERROR_UNEXPECTED); + return NS_ERROR_UNEXPECTED; + } + } +#ifdef DEBUG + mSyncCallback = true; +#endif + + CORSMode ourCORSMode = aLoadData->mSheet->GetCORSMode(); + nsSecurityFlags securityFlags = + ourCORSMode == CORS_NONE + ? nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_INHERITS + : nsILoadInfo::SEC_REQUIRE_CORS_DATA_INHERITS; + if (ourCORSMode == CORS_ANONYMOUS) { + securityFlags |= nsILoadInfo::SEC_COOKIES_SAME_ORIGIN; + } else if (ourCORSMode == CORS_USE_CREDENTIALS) { + securityFlags |= nsILoadInfo::SEC_COOKIES_INCLUDE; + } + securityFlags |= nsILoadInfo::SEC_ALLOW_CHROME; + + nsContentPolicyType contentPolicyType = + aIsPreload ? nsIContentPolicy::TYPE_INTERNAL_STYLESHEET_PRELOAD + : nsIContentPolicy::TYPE_INTERNAL_STYLESHEET; + + nsCOMPtr<nsIChannel> channel; + // Note we are calling NS_NewChannelWithTriggeringPrincipal here with a node + // and a principal. This is because of a case where the node is the document + // being styled and the principal is the stylesheet (perhaps from a different + // origin) that is applying the styles. + if (aLoadData->mRequestingNode && aLoadData->mLoaderPrincipal) { + rv = NS_NewChannelWithTriggeringPrincipal(getter_AddRefs(channel), + aLoadData->mURI, + aLoadData->mRequestingNode, + aLoadData->mLoaderPrincipal, + securityFlags, + contentPolicyType, + loadGroup, + nullptr, // aCallbacks + nsIChannel::LOAD_NORMAL | + nsIChannel::LOAD_CLASSIFY_URI); + } + else { + // either we are loading something inside a document, in which case + // we should always have a requestingNode, or we are loading something + // outside a document, in which case the loadingPrincipal and the + // triggeringPrincipal should always be the systemPrincipal. + rv = NS_NewChannel(getter_AddRefs(channel), + aLoadData->mURI, + nsContentUtils::GetSystemPrincipal(), + securityFlags, + contentPolicyType, + loadGroup, + nullptr, // aCallbacks + nsIChannel::LOAD_NORMAL | + nsIChannel::LOAD_CLASSIFY_URI); + } + + if (NS_FAILED(rv)) { +#ifdef DEBUG + mSyncCallback = false; +#endif + LOG_ERROR((" Failed to create channel")); + SheetComplete(aLoadData, rv); + return rv; + } + + if (!aLoadData->mWasAlternate) { + nsCOMPtr<nsIClassOfService> cos(do_QueryInterface(channel)); + if (cos) { + cos->AddClassFlags(nsIClassOfService::Leader); + } + } + + nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(channel)); + if (httpChannel) { + // Send a minimal Accept header for text/css + httpChannel->SetRequestHeader(NS_LITERAL_CSTRING("Accept"), + NS_LITERAL_CSTRING("text/css,*/*;q=0.1"), + false); + nsCOMPtr<nsIURI> referrerURI = aLoadData->GetReferrerURI(); + if (referrerURI) + httpChannel->SetReferrerWithPolicy(referrerURI, + aLoadData->mSheet->GetReferrerPolicy()); + + nsCOMPtr<nsIHttpChannelInternal> internalChannel = do_QueryInterface(httpChannel); + if (internalChannel) { + internalChannel->SetIntegrityMetadata(sriMetadata.GetIntegrityString()); + } + + // Set the initiator type + nsCOMPtr<nsITimedChannel> timedChannel(do_QueryInterface(httpChannel)); + if (timedChannel) { + if (aLoadData->mParentData) { + timedChannel->SetInitiatorType(NS_LITERAL_STRING("css")); + } else { + timedChannel->SetInitiatorType(NS_LITERAL_STRING("link")); + } + } + } + + // Now tell the channel we expect text/css data back.... We do + // this before opening it, so it's only treated as a hint. + channel->SetContentType(NS_LITERAL_CSTRING("text/css")); + + // We don't have to hold on to the stream loader. The ownership + // model is: Necko owns the stream loader, which owns the load data, + // which owns us + nsCOMPtr<nsIUnicharStreamLoader> streamLoader; + rv = NS_NewUnicharStreamLoader(getter_AddRefs(streamLoader), aLoadData); + if (NS_FAILED(rv)) { +#ifdef DEBUG + mSyncCallback = false; +#endif + LOG_ERROR((" Failed to create stream loader")); + SheetComplete(aLoadData, rv); + return rv; + } + + if (mDocument) { + mozilla::net::PredictorLearn(aLoadData->mURI, mDocument->GetDocumentURI(), + nsINetworkPredictor::LEARN_LOAD_SUBRESOURCE, + mDocument); + } + + rv = channel->AsyncOpen2(streamLoader); + +#ifdef DEBUG + mSyncCallback = false; +#endif + + if (NS_FAILED(rv)) { + LOG_ERROR((" Failed to create stream loader")); + SheetComplete(aLoadData, rv); + return rv; + } + + mSheets->mLoadingDatas.Put(&key, aLoadData); + aLoadData->mIsLoading = true; + + return NS_OK; +} + +/** + * ParseSheet handles parsing the data stream. The main idea here is + * to push the current load data onto the parse stack before letting + * the CSS parser at the data stream. That lets us handle @import + * correctly. + */ +nsresult +Loader::ParseSheet(const nsAString& aInput, + SheetLoadData* aLoadData, + bool& aCompleted) +{ + LOG(("css::Loader::ParseSheet")); + NS_PRECONDITION(aLoadData, "Must have load data"); + NS_PRECONDITION(aLoadData->mSheet, "Must have sheet to parse into"); + + aCompleted = false; + + // Push our load data on the stack so any kids can pick it up + mParsingDatas.AppendElement(aLoadData); + nsIURI* sheetURI = aLoadData->mSheet->GetSheetURI(); + nsIURI* baseURI = aLoadData->mSheet->GetBaseURI(); + + nsresult rv; + + if (aLoadData->mSheet->IsGecko()) { + nsCSSParser parser(this, aLoadData->mSheet->AsGecko()); + rv = parser.ParseSheet(aInput, sheetURI, baseURI, + aLoadData->mSheet->Principal(), + aLoadData->mLineNumber); + } else { + rv = + aLoadData->mSheet->AsServo()->ParseSheet(aInput, sheetURI, baseURI, + aLoadData->mSheet->Principal(), + aLoadData->mLineNumber); + } + + mParsingDatas.RemoveElementAt(mParsingDatas.Length() - 1); + + if (NS_FAILED(rv)) { + LOG_ERROR((" Low-level error in parser!")); + SheetComplete(aLoadData, rv); + return rv; + } + + NS_ASSERTION(aLoadData->mPendingChildren == 0 || !aLoadData->mSyncLoad, + "Sync load has leftover pending children!"); + + if (aLoadData->mPendingChildren == 0) { + LOG((" No pending kids from parse")); + aCompleted = true; + SheetComplete(aLoadData, NS_OK); + } + // Otherwise, the children are holding strong refs to the data and + // will call SheetComplete() on it when they complete. + + return NS_OK; +} + +/** + * SheetComplete is the do-it-all cleanup function. It removes the + * load data from the "loading" hashtable, adds the sheet to the + * "completed" hashtable, massages the XUL cache, handles siblings of + * the load data (other loads for the same URI), handles unblocking + * blocked parent loads as needed, and most importantly calls + * NS_RELEASE on the load data to destroy the whole mess. + */ +void +Loader::SheetComplete(SheetLoadData* aLoadData, nsresult aStatus) +{ + LOG(("css::Loader::SheetComplete")); + + if (aLoadData->mSheet->IsServo() && NS_FAILED(aStatus)) { + aLoadData->mSheet->AsServo()->LoadFailed(); + } + + // 8 is probably big enough for all our common cases. It's not likely that + // imports will nest more than 8 deep, and multiple sheets with the same URI + // are rare. + AutoTArray<RefPtr<SheetLoadData>, 8> datasToNotify; + DoSheetComplete(aLoadData, aStatus, datasToNotify); + + // Now it's safe to go ahead and notify observers + uint32_t count = datasToNotify.Length(); + mDatasToNotifyOn += count; + for (uint32_t i = 0; i < count; ++i) { + --mDatasToNotifyOn; + + SheetLoadData* data = datasToNotify[i]; + NS_ASSERTION(data && data->mMustNotify, "How did this data get here?"); + if (data->mObserver) { + LOG((" Notifying observer %p for data %p. wasAlternate: %d", + data->mObserver.get(), data, data->mWasAlternate)); + data->mObserver->StyleSheetLoaded(data->mSheet, data->mWasAlternate, + aStatus); + } + + nsTObserverArray<nsCOMPtr<nsICSSLoaderObserver> >::ForwardIterator iter(mObservers); + nsCOMPtr<nsICSSLoaderObserver> obs; + while (iter.HasMore()) { + obs = iter.GetNext(); + LOG((" Notifying global observer %p for data %p. wasAlternate: %d", + obs.get(), data, data->mWasAlternate)); + obs->StyleSheetLoaded(data->mSheet, data->mWasAlternate, aStatus); + } + } + + if (mSheets->mLoadingDatas.Count() == 0 && mSheets->mPendingDatas.Count() > 0) { + LOG((" No more loading sheets; starting alternates")); + StartAlternateLoads(); + } +} + +void +Loader::DoSheetComplete(SheetLoadData* aLoadData, nsresult aStatus, + LoadDataArray& aDatasToNotify) +{ + LOG(("css::Loader::DoSheetComplete")); + NS_PRECONDITION(aLoadData, "Must have a load data!"); + NS_PRECONDITION(aLoadData->mSheet, "Must have a sheet"); + NS_ASSERTION(mSheets, "mLoadingDatas should be initialized by now."); + + LOG(("Load completed, status: 0x%x", aStatus)); + + // Twiddle the hashtables + if (aLoadData->mURI) { + LOG_URI(" Finished loading: '%s'", aLoadData->mURI); + // Remove the data from the list of loading datas + if (aLoadData->mIsLoading) { + URIPrincipalReferrerPolicyAndCORSModeHashKey key(aLoadData->mURI, + aLoadData->mLoaderPrincipal, + aLoadData->mSheet->GetCORSMode(), + aLoadData->mSheet->GetReferrerPolicy()); +#ifdef DEBUG + SheetLoadData *loadingData; + NS_ASSERTION(mSheets->mLoadingDatas.Get(&key, &loadingData) && + loadingData == aLoadData, + "Bad loading table"); +#endif + + mSheets->mLoadingDatas.Remove(&key); + aLoadData->mIsLoading = false; + } + } + + // Go through and deal with the whole linked list. + SheetLoadData* data = aLoadData; + while (data) { + if (!data->mSheetAlreadyComplete) { + // If mSheetAlreadyComplete, then the sheet could well be modified between + // when we posted the async call to SheetComplete and now, since the sheet + // was page-accessible during that whole time. + MOZ_ASSERT(!(data->mSheet->IsGecko() && + data->mSheet->AsGecko()->IsModified()), + "should not get marked modified during parsing"); + data->mSheet->SetComplete(); + data->ScheduleLoadEventIfNeeded(aStatus); + } + if (data->mMustNotify && (data->mObserver || !mObservers.IsEmpty())) { + // Don't notify here so we don't trigger script. Remember the + // info we need to notify, then do it later when it's safe. + aDatasToNotify.AppendElement(data); + + // On append failure, just press on. We'll fail to notify the observer, + // but not much we can do about that.... + } + + NS_ASSERTION(!data->mParentData || + data->mParentData->mPendingChildren != 0, + "Broken pending child count on our parent"); + + // If we have a parent, our parent is no longer being parsed, and + // we are the last pending child, then our load completion + // completes the parent too. Note that the parent _can_ still be + // being parsed (eg if the child (us) failed to open the channel + // or some such). + if (data->mParentData && + --(data->mParentData->mPendingChildren) == 0 && + !mParsingDatas.Contains(data->mParentData)) { + DoSheetComplete(data->mParentData, aStatus, aDatasToNotify); + } + + data = data->mNext; + } + + // Now that it's marked complete, put the sheet in our cache. + // If we ever start doing this for failure aStatus, we'll need to + // adjust the PostLoadEvent code that thinks anything already + // complete must have loaded succesfully. + if (NS_SUCCEEDED(aStatus) && aLoadData->mURI) { + // Pick our sheet to cache carefully. Ideally, we want to cache + // one of the sheets that will be kept alive by a document or + // parent sheet anyway, so that if someone then accesses it via + // CSSOM we won't have extra clones of the inner lying around. + if (aLoadData->mSheet->IsGecko()) { + data = aLoadData; + CSSStyleSheet* sheet = aLoadData->mSheet->AsGecko(); + while (data) { + if (data->mSheet->GetParentSheet() || data->mSheet->GetOwnerNode()) { + sheet = data->mSheet->AsGecko(); + break; + } + data = data->mNext; + } +#ifdef MOZ_XUL + if (IsChromeURI(aLoadData->mURI)) { + nsXULPrototypeCache* cache = nsXULPrototypeCache::GetInstance(); + if (cache && cache->IsEnabled()) { + if (!cache->GetStyleSheet(aLoadData->mURI)) { + LOG((" Putting sheet in XUL prototype cache")); + NS_ASSERTION(sheet->IsComplete(), + "Should only be caching complete sheets"); + cache->PutStyleSheet(sheet); + } + } + } + else { +#endif + URIPrincipalReferrerPolicyAndCORSModeHashKey key(aLoadData->mURI, + aLoadData->mLoaderPrincipal, + aLoadData->mSheet->GetCORSMode(), + aLoadData->mSheet->GetReferrerPolicy()); + NS_ASSERTION(sheet->IsComplete(), + "Should only be caching complete sheets"); + mSheets->mCompleteSheets.Put(&key, sheet); +#ifdef MOZ_XUL + } +#endif + } else { + NS_WARNING("stylo: Stylesheet caching not yet supported - see bug 1290218."); + } + } + + NS_RELEASE(aLoadData); // this will release parents and siblings and all that +} + +nsresult +Loader::LoadInlineStyle(nsIContent* aElement, + const nsAString& aBuffer, + uint32_t aLineNumber, + const nsAString& aTitle, + const nsAString& aMedia, + Element* aScopeElement, + nsICSSLoaderObserver* aObserver, + bool* aCompleted, + bool* aIsAlternate) +{ + LOG(("css::Loader::LoadInlineStyle")); + NS_ASSERTION(mParsingDatas.Length() == 0, "We're in the middle of a parse?"); + + *aCompleted = true; + + if (!mEnabled) { + LOG_WARN((" Not enabled")); + return NS_ERROR_NOT_AVAILABLE; + } + + NS_ENSURE_TRUE(mDocument, NS_ERROR_NOT_INITIALIZED); + + nsCOMPtr<nsIStyleSheetLinkingElement> owningElement(do_QueryInterface(aElement)); + NS_ASSERTION(owningElement, "Element is not a style linking element!"); + + // Since we're not planning to load a URI, no need to hand a principal to the + // load data or to CreateSheet(). Also, OK to use CORS_NONE for the CORS + // mode and mDocument's ReferrerPolicy. + StyleSheetState state; + RefPtr<StyleSheet> sheet; + nsresult rv = CreateSheet(nullptr, aElement, nullptr, eAuthorSheetFeatures, + CORS_NONE, mDocument->GetReferrerPolicy(), + EmptyString(), // no inline integrity checks + false, false, aTitle, state, aIsAlternate, + &sheet); + NS_ENSURE_SUCCESS(rv, rv); + NS_ASSERTION(state == eSheetNeedsParser, + "Inline sheets should not be cached"); + + LOG((" Sheet is alternate: %d", *aIsAlternate)); + + PrepareSheet(sheet, aTitle, aMedia, nullptr, aScopeElement, *aIsAlternate); + + if (aElement->HasFlag(NODE_IS_IN_SHADOW_TREE)) { + ShadowRoot* containingShadow = aElement->GetContainingShadow(); + MOZ_ASSERT(containingShadow); + containingShadow->InsertSheet(sheet, aElement); + } else { + rv = InsertSheetInDoc(sheet, aElement, mDocument); + NS_ENSURE_SUCCESS(rv, rv); + } + + SheetLoadData* data = new SheetLoadData(this, aTitle, nullptr, sheet, + owningElement, *aIsAlternate, + aObserver, nullptr, static_cast<nsINode*>(aElement)); + + // We never actually load this, so just set its principal directly + sheet->SetPrincipal(aElement->NodePrincipal()); + + NS_ADDREF(data); + data->mLineNumber = aLineNumber; + // Parse completion releases the load data + rv = ParseSheet(aBuffer, data, *aCompleted); + NS_ENSURE_SUCCESS(rv, rv); + + // If aCompleted is true, |data| may well be deleted by now. + if (!*aCompleted) { + data->mMustNotify = true; + } + return rv; +} + +nsresult +Loader::LoadStyleLink(nsIContent* aElement, + nsIURI* aURL, + const nsAString& aTitle, + const nsAString& aMedia, + bool aHasAlternateRel, + CORSMode aCORSMode, + ReferrerPolicy aReferrerPolicy, + const nsAString& aIntegrity, + nsICSSLoaderObserver* aObserver, + bool* aIsAlternate) +{ + LOG(("css::Loader::LoadStyleLink")); + NS_PRECONDITION(aURL, "Must have URL to load"); + NS_ASSERTION(mParsingDatas.Length() == 0, "We're in the middle of a parse?"); + + LOG_URI(" Link uri: '%s'", aURL); + LOG((" Link title: '%s'", NS_ConvertUTF16toUTF8(aTitle).get())); + LOG((" Link media: '%s'", NS_ConvertUTF16toUTF8(aMedia).get())); + LOG((" Link alternate rel: %d", aHasAlternateRel)); + + if (!mEnabled) { + LOG_WARN((" Not enabled")); + return NS_ERROR_NOT_AVAILABLE; + } + + NS_ENSURE_TRUE(mDocument, NS_ERROR_NOT_INITIALIZED); + + nsIPrincipal* principal = + aElement ? aElement->NodePrincipal() : mDocument->NodePrincipal(); + + nsISupports* context = aElement; + if (!context) { + context = mDocument; + } + + nsresult rv = CheckContentPolicy(principal, aURL, context, false); + if (NS_WARN_IF(NS_FAILED(rv))) { + // Don't fire the error event if our document is loaded as data. We're + // supposed to not even try to do loads in that case... Unfortunately, we + // implement that via nsDataDocumentContentPolicy, which doesn't have a good + // way to communicate back to us that _it_ is the thing that blocked the + // load. + if (aElement && !mDocument->IsLoadedAsData()) { + // Fire an async error event on it. + RefPtr<AsyncEventDispatcher> loadBlockingAsyncDispatcher = + new LoadBlockingAsyncEventDispatcher(aElement, + NS_LITERAL_STRING("error"), + false, false); + loadBlockingAsyncDispatcher->PostDOMEvent(); + } + return rv; + } + + StyleSheetState state; + RefPtr<StyleSheet> sheet; + rv = CreateSheet(aURL, aElement, principal, eAuthorSheetFeatures, + aCORSMode, aReferrerPolicy, aIntegrity, false, + aHasAlternateRel, aTitle, state, aIsAlternate, + &sheet); + NS_ENSURE_SUCCESS(rv, rv); + + LOG((" Sheet is alternate: %d", *aIsAlternate)); + + PrepareSheet(sheet, aTitle, aMedia, nullptr, nullptr, *aIsAlternate); + + rv = InsertSheetInDoc(sheet, aElement, mDocument); + NS_ENSURE_SUCCESS(rv, rv); + + nsCOMPtr<nsIStyleSheetLinkingElement> owningElement(do_QueryInterface(aElement)); + + if (state == eSheetComplete) { + LOG((" Sheet already complete: 0x%p", sheet.get())); + if (aObserver || !mObservers.IsEmpty() || owningElement) { + rv = PostLoadEvent(aURL, sheet, aObserver, *aIsAlternate, + owningElement); + return rv; + } + + return NS_OK; + } + + // Now we need to actually load it + nsCOMPtr<nsINode> requestingNode = do_QueryInterface(context); + SheetLoadData* data = new SheetLoadData(this, aTitle, aURL, sheet, + owningElement, *aIsAlternate, + aObserver, principal, requestingNode); + NS_ADDREF(data); + + // If we have to parse and it's an alternate non-inline, defer it + if (aURL && state == eSheetNeedsParser && mSheets->mLoadingDatas.Count() != 0 && + *aIsAlternate) { + LOG((" Deferring alternate sheet load")); + URIPrincipalReferrerPolicyAndCORSModeHashKey key(data->mURI, + data->mLoaderPrincipal, + data->mSheet->GetCORSMode(), + data->mSheet->GetReferrerPolicy()); + mSheets->mPendingDatas.Put(&key, data); + + data->mMustNotify = true; + return NS_OK; + } + + // Load completion will free the data + rv = LoadSheet(data, state, false); + NS_ENSURE_SUCCESS(rv, rv); + + data->mMustNotify = true; + return rv; +} + +static bool +HaveAncestorDataWithURI(SheetLoadData *aData, nsIURI *aURI) +{ + if (!aData->mURI) { + // Inline style; this won't have any ancestors + MOZ_ASSERT(!aData->mParentData, + "How does inline style have a parent?"); + return false; + } + + bool equal; + if (NS_FAILED(aData->mURI->Equals(aURI, &equal)) || equal) { + return true; + } + + // Datas down the mNext chain have the same URI as aData, so we + // don't have to compare to them. But they might have different + // parents, and we have to check all of those. + while (aData) { + if (aData->mParentData && + HaveAncestorDataWithURI(aData->mParentData, aURI)) { + return true; + } + + aData = aData->mNext; + } + + return false; +} + +nsresult +Loader::LoadChildSheet(StyleSheet* aParentSheet, + nsIURI* aURL, + nsMediaList* aMedia, + ImportRule* aParentRule, + LoaderReusableStyleSheets* aReusableSheets) +{ + LOG(("css::Loader::LoadChildSheet")); + NS_PRECONDITION(aURL, "Must have a URI to load"); + NS_PRECONDITION(aParentSheet, "Must have a parent sheet"); + + if (!mEnabled) { + LOG_WARN((" Not enabled")); + return NS_ERROR_NOT_AVAILABLE; + } + + LOG_URI(" Child uri: '%s'", aURL); + + nsCOMPtr<nsINode> owningNode; + + // check for an owning document: if none, don't bother walking up the parent + // sheets + if (aParentSheet->GetOwningDocument()) { + StyleSheet* topSheet = aParentSheet; + while (StyleSheet* parent = topSheet->GetParentSheet()) { + topSheet = parent; + } + owningNode = topSheet->GetOwnerNode(); + } + + nsISupports* context = owningNode; + if (!context) { + context = mDocument; + } + + nsIPrincipal* principal = aParentSheet->Principal(); + nsresult rv = CheckContentPolicy(principal, aURL, context, false); + NS_ENSURE_SUCCESS(rv, rv); + + SheetLoadData* parentData = nullptr; + nsCOMPtr<nsICSSLoaderObserver> observer; + + int32_t count = mParsingDatas.Length(); + if (count > 0) { + LOG((" Have a parent load")); + parentData = mParsingDatas.ElementAt(count - 1); + // Check for cycles + if (HaveAncestorDataWithURI(parentData, aURL)) { + // Houston, we have a loop, blow off this child and pretend this never + // happened + LOG_ERROR((" @import cycle detected, dropping load")); + return NS_OK; + } + + NS_ASSERTION(parentData->mSheet == aParentSheet, + "Unexpected call to LoadChildSheet"); + } else { + LOG((" No parent load; must be CSSOM")); + // No parent load data, so the sheet will need to be notified when + // we finish, if it can be, if we do the load asynchronously. + // XXXheycam ServoStyleSheet doesn't implement nsICSSLoaderObserver yet. + MOZ_ASSERT(aParentSheet->IsGecko(), + "stylo: ServoStyleSheets don't support child sheet loading yet"); + observer = aParentSheet->AsGecko(); + } + + // Now that we know it's safe to load this (passes security check and not a + // loop) do so. + RefPtr<StyleSheet> sheet; + RefPtr<CSSStyleSheet> reusableSheet; + StyleSheetState state; + if (aReusableSheets && aReusableSheets->FindReusableStyleSheet(aURL, reusableSheet)) { + sheet = reusableSheet; + aParentRule->SetSheet(reusableSheet); + state = eSheetComplete; + } else { + bool isAlternate; + const nsSubstring& empty = EmptyString(); + // For now, use CORS_NONE for child sheets + rv = CreateSheet(aURL, nullptr, principal, + aParentSheet->ParsingMode(), + CORS_NONE, aParentSheet->GetReferrerPolicy(), + EmptyString(), // integrity is only checked on main sheet + parentData ? parentData->mSyncLoad : false, + false, empty, state, &isAlternate, &sheet); + NS_ENSURE_SUCCESS(rv, rv); + + PrepareSheet(sheet, empty, empty, aMedia, nullptr, isAlternate); + } + + rv = InsertChildSheet(sheet, aParentSheet, aParentRule); + NS_ENSURE_SUCCESS(rv, rv); + + if (state == eSheetComplete) { + LOG((" Sheet already complete")); + // We're completely done. No need to notify, even, since the + // @import rule addition/modification will trigger the right style + // changes automatically. + return NS_OK; + } + + nsCOMPtr<nsINode> requestingNode = do_QueryInterface(context); + SheetLoadData* data = new SheetLoadData(this, aURL, sheet, parentData, + observer, principal, requestingNode); + + NS_ADDREF(data); + bool syncLoad = data->mSyncLoad; + + // Load completion will release the data + rv = LoadSheet(data, state, false); + NS_ENSURE_SUCCESS(rv, rv); + + // If syncLoad is true, |data| will be deleted by now. + if (!syncLoad) { + data->mMustNotify = true; + } + return rv; +} + +nsresult +Loader::LoadSheetSync(nsIURI* aURL, + SheetParsingMode aParsingMode, + bool aUseSystemPrincipal, + RefPtr<StyleSheet>* aSheet) +{ + LOG(("css::Loader::LoadSheetSync")); + return InternalLoadNonDocumentSheet(aURL, + false, aParsingMode, aUseSystemPrincipal, + nullptr, EmptyCString(), + aSheet, nullptr); +} + +nsresult +Loader::LoadSheet(nsIURI* aURL, + nsIPrincipal* aOriginPrincipal, + const nsCString& aCharset, + nsICSSLoaderObserver* aObserver, + RefPtr<StyleSheet>* aSheet) +{ + LOG(("css::Loader::LoadSheet(aURL, aObserver, aSheet) api call")); + NS_PRECONDITION(aSheet, "aSheet is null"); + return InternalLoadNonDocumentSheet(aURL, + false, eAuthorSheetFeatures, false, + aOriginPrincipal, aCharset, + aSheet, aObserver); +} + +nsresult +Loader::LoadSheet(nsIURI* aURL, + bool aIsPreload, + nsIPrincipal* aOriginPrincipal, + const nsCString& aCharset, + nsICSSLoaderObserver* aObserver, + CORSMode aCORSMode, + ReferrerPolicy aReferrerPolicy, + const nsAString& aIntegrity) +{ + LOG(("css::Loader::LoadSheet(aURL, aObserver) api call")); + return InternalLoadNonDocumentSheet(aURL, + aIsPreload, eAuthorSheetFeatures, false, + aOriginPrincipal, aCharset, + nullptr, aObserver, + aCORSMode, aReferrerPolicy, aIntegrity); +} + +nsresult +Loader::InternalLoadNonDocumentSheet(nsIURI* aURL, + bool aIsPreload, + SheetParsingMode aParsingMode, + bool aUseSystemPrincipal, + nsIPrincipal* aOriginPrincipal, + const nsCString& aCharset, + RefPtr<StyleSheet>* aSheet, + nsICSSLoaderObserver* aObserver, + CORSMode aCORSMode, + ReferrerPolicy aReferrerPolicy, + const nsAString& aIntegrity) +{ + NS_PRECONDITION(aURL, "Must have a URI to load"); + NS_PRECONDITION(aSheet || aObserver, "Sheet and observer can't both be null"); + NS_PRECONDITION(!aUseSystemPrincipal || !aObserver, + "Shouldn't load system-principal sheets async"); + NS_ASSERTION(mParsingDatas.Length() == 0, "We're in the middle of a parse?"); + + LOG_URI(" Non-document sheet uri: '%s'", aURL); + + if (aSheet) { + *aSheet = nullptr; + } + + if (!mEnabled) { + LOG_WARN((" Not enabled")); + return NS_ERROR_NOT_AVAILABLE; + } + + nsresult rv = CheckContentPolicy(aOriginPrincipal, aURL, mDocument, aIsPreload); + NS_ENSURE_SUCCESS(rv, rv); + + StyleSheetState state; + bool isAlternate; + RefPtr<StyleSheet> sheet; + bool syncLoad = (aObserver == nullptr); + const nsSubstring& empty = EmptyString(); + + rv = CreateSheet(aURL, nullptr, aOriginPrincipal, aParsingMode, + aCORSMode, aReferrerPolicy, aIntegrity, syncLoad, + false, empty, state, &isAlternate, &sheet); + NS_ENSURE_SUCCESS(rv, rv); + + PrepareSheet(sheet, empty, empty, nullptr, nullptr, isAlternate); + + if (state == eSheetComplete) { + LOG((" Sheet already complete")); + if (aObserver || !mObservers.IsEmpty()) { + rv = PostLoadEvent(aURL, sheet, aObserver, false, nullptr); + } + if (aSheet) { + sheet.swap(*aSheet); + } + return rv; + } + + SheetLoadData* data = + new SheetLoadData(this, aURL, sheet, syncLoad, + aUseSystemPrincipal, aCharset, aObserver, + aOriginPrincipal, mDocument); + + NS_ADDREF(data); + rv = LoadSheet(data, state, aIsPreload); + NS_ENSURE_SUCCESS(rv, rv); + + if (aSheet) { + sheet.swap(*aSheet); + } + if (aObserver) { + data->mMustNotify = true; + } + + return rv; +} + +nsresult +Loader::PostLoadEvent(nsIURI* aURI, + StyleSheet* aSheet, + nsICSSLoaderObserver* aObserver, + bool aWasAlternate, + nsIStyleSheetLinkingElement* aElement) +{ + LOG(("css::Loader::PostLoadEvent")); + NS_PRECONDITION(aSheet, "Must have sheet"); + NS_PRECONDITION(aObserver || !mObservers.IsEmpty() || aElement, + "Must have observer or element"); + + RefPtr<SheetLoadData> evt = + new SheetLoadData(this, EmptyString(), // title doesn't matter here + aURI, + aSheet, + aElement, + aWasAlternate, + aObserver, + nullptr, + mDocument); + NS_ENSURE_TRUE(evt, NS_ERROR_OUT_OF_MEMORY); + + if (!mPostedEvents.AppendElement(evt)) { + return NS_ERROR_OUT_OF_MEMORY; + } + + nsresult rv = NS_DispatchToCurrentThread(evt); + if (NS_FAILED(rv)) { + NS_WARNING("failed to dispatch stylesheet load event"); + mPostedEvents.RemoveElement(evt); + } else { + // We'll unblock onload when we handle the event. + if (mDocument) { + mDocument->BlockOnload(); + } + + // We want to notify the observer for this data. + evt->mMustNotify = true; + evt->mSheetAlreadyComplete = true; + + // If we get to this code, aSheet loaded correctly at some point, so + // we can just use NS_OK for the status. Note that we do this here + // and not from inside our SheetComplete so that we don't end up + // running the load event async. + evt->ScheduleLoadEventIfNeeded(NS_OK); + } + + return rv; +} + +void +Loader::HandleLoadEvent(SheetLoadData* aEvent) +{ + // XXXbz can't assert this yet.... May not have an observer because + // we're unblocking the parser + // NS_ASSERTION(aEvent->mObserver, "Must have observer"); + NS_ASSERTION(aEvent->mSheet, "Must have sheet"); + + // Very important: this needs to come before the SheetComplete call + // below, so that HasPendingLoads() will test true as needed under + // notifications we send from that SheetComplete call. + mPostedEvents.RemoveElement(aEvent); + + if (!aEvent->mIsCancelled) { + // SheetComplete will call Release(), so give it a reference to do + // that with. + NS_ADDREF(aEvent); + SheetComplete(aEvent, NS_OK); + } + + if (mDocument) { + mDocument->UnblockOnload(true); + } +} + +static void +StopLoadingSheets( + nsDataHashtable<URIPrincipalReferrerPolicyAndCORSModeHashKey, SheetLoadData*>& aDatas, + Loader::LoadDataArray& aArr) +{ + for (auto iter = aDatas.Iter(); !iter.Done(); iter.Next()) { + SheetLoadData* data = iter.Data(); + MOZ_ASSERT(data, "Must have a data!"); + + data->mIsLoading = false; // we will handle the removal right here + data->mIsCancelled = true; + + aArr.AppendElement(data); + + iter.Remove(); + } +} + +nsresult +Loader::Stop() +{ + uint32_t pendingCount = mSheets ? mSheets->mPendingDatas.Count() : 0; + uint32_t loadingCount = mSheets ? mSheets->mLoadingDatas.Count() : 0; + LoadDataArray arr(pendingCount + loadingCount + mPostedEvents.Length()); + + if (pendingCount) { + StopLoadingSheets(mSheets->mPendingDatas, arr); + } + if (loadingCount) { + StopLoadingSheets(mSheets->mLoadingDatas, arr); + } + + uint32_t i; + for (i = 0; i < mPostedEvents.Length(); ++i) { + SheetLoadData* data = mPostedEvents[i]; + data->mIsCancelled = true; + if (arr.AppendElement(data)) { + // SheetComplete() calls Release(), so give this an extra ref. + NS_ADDREF(data); + } +#ifdef DEBUG + else { + NS_NOTREACHED("We preallocated this memory... shouldn't really fail, " + "except we never check that preallocation succeeds."); + } +#endif + } + mPostedEvents.Clear(); + + mDatasToNotifyOn += arr.Length(); + for (i = 0; i < arr.Length(); ++i) { + --mDatasToNotifyOn; + SheetComplete(arr[i], NS_BINDING_ABORTED); + } + return NS_OK; +} + +bool +Loader::HasPendingLoads() +{ + return + (mSheets && mSheets->mLoadingDatas.Count() != 0) || + (mSheets && mSheets->mPendingDatas.Count() != 0) || + mPostedEvents.Length() != 0 || + mDatasToNotifyOn != 0; +} + +nsresult +Loader::AddObserver(nsICSSLoaderObserver* aObserver) +{ + NS_PRECONDITION(aObserver, "Must have observer"); + if (mObservers.AppendElementUnlessExists(aObserver)) { + return NS_OK; + } + + return NS_ERROR_OUT_OF_MEMORY; +} + +void +Loader::RemoveObserver(nsICSSLoaderObserver* aObserver) +{ + mObservers.RemoveElement(aObserver); +} + +void +Loader::StartAlternateLoads() +{ + NS_PRECONDITION(mSheets, "Don't call me!"); + LoadDataArray arr(mSheets->mPendingDatas.Count()); + for (auto iter = mSheets->mPendingDatas.Iter(); !iter.Done(); iter.Next()) { + arr.AppendElement(iter.Data()); + iter.Remove(); + } + + mDatasToNotifyOn += arr.Length(); + for (uint32_t i = 0; i < arr.Length(); ++i) { + --mDatasToNotifyOn; + LoadSheet(arr[i], eSheetNeedsParser, false); + } +} + +NS_IMPL_CYCLE_COLLECTION_CLASS(Loader) + +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Loader) + if (tmp->mSheets) { + for (auto iter = tmp->mSheets->mCompleteSheets.Iter(); + !iter.Done(); + iter.Next()) { + NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "Sheet cache nsCSSLoader"); + if (iter.UserData()->IsGecko()) { + CSSStyleSheet* sheet = iter.UserData()->AsGecko(); + cb.NoteXPCOMChild(NS_ISUPPORTS_CAST(nsIDOMCSSStyleSheet*, sheet)); + } + } + } + nsTObserverArray<nsCOMPtr<nsICSSLoaderObserver>>::ForwardIterator + it(tmp->mObservers); + while (it.HasMore()) { + ImplCycleCollectionTraverse(cb, it.GetNext(), + "mozilla::css::Loader.mObservers"); + } +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END + +NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(Loader) + if (tmp->mSheets) { + tmp->mSheets->mCompleteSheets.Clear(); + } + tmp->mObservers.Clear(); +NS_IMPL_CYCLE_COLLECTION_UNLINK_END + +NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(Loader, AddRef) +NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(Loader, Release) + +size_t +Loader::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const +{ + size_t n = aMallocSizeOf(this); + + if (mSheets) { + n += mSheets->mCompleteSheets.ShallowSizeOfExcludingThis(aMallocSizeOf); + for (auto iter = mSheets->mCompleteSheets.ConstIter(); + !iter.Done(); + iter.Next()) { + // If aSheet has a parent, then its parent will report it so we don't + // have to worry about it here. Likewise, if aSheet has an owning node, + // then the document that node is in will report it. + const StyleSheet* sheet = iter.UserData(); + n += (sheet->GetOwnerNode() || sheet->GetParentSheet()) + ? 0 + : sheet->SizeOfIncludingThis(aMallocSizeOf); + } + } + n += mObservers.ShallowSizeOfExcludingThis(aMallocSizeOf); + + // Measurement of the following members may be added later if DMD finds it is + // worthwhile: + // - mLoadingDatas: transient, and should be small + // - mPendingDatas: transient, and should be small + // - mParsingDatas: transient, and should be small + // - mPostedEvents: transient, and should be small + // + // The following members aren't measured: + // - mDocument, because it's a weak backpointer + // - mPreferredSheet, because it can be a shared string + + return n; +} + +StyleBackendType +Loader::GetStyleBackendType() const +{ + MOZ_ASSERT(mStyleBackendType || mDocument, + "you must construct a Loader with a document or set a " + "StyleBackendType on it before calling GetStyleBackendType"); + if (mStyleBackendType) { + return *mStyleBackendType; + } + return mDocument->GetStyleBackendType(); +} + +} // namespace css +} // namespace mozilla |