6e86d03b2e
URI the sheet was loaded from, its certificate (if any) and the loader principal, not just on the page the sheet is being applied to. Propagate this principal as the loading principal to @import loads from stylesheets. Change sheet access checks to use this principal instead of the sheet URI. Bug 221428, r+sr=peterv git-svn-id: svn://10.0.0.236/trunk@225401 18797224-902f-48f8-a5cc-f745e15eee43
487 lines
18 KiB
C++
487 lines
18 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: ft=cpp tw=78 sw=2 et ts=2
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1999
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Boris Zbarsky <bzbarsky@mit.edu>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK *****
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*
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* This Original Code has been modified by IBM Corporation. Modifications made by IBM
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* described herein are Copyright (c) International Business Machines Corporation, 2000.
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* Modifications to Mozilla code or documentation identified per MPL Section 3.3
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*
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* Date Modified by Description of modification
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* 04/20/2000 IBM Corp. OS/2 VisualAge build.
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*/
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/* loading of CSS style sheets using the network APIs */
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#ifndef nsCSSLoader_h__
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#define nsCSSLoader_h__
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class CSSLoaderImpl;
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class nsIURI;
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class nsICSSStyleSheet;
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class nsIStyleSheetLinkingElement;
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class nsICSSLoaderObserver;
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class nsICSSParser;
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class nsICSSImportRule;
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class nsMediaList;
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#include "nsICSSLoader.h"
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#include "nsIRunnable.h"
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#include "nsIUnicharStreamLoader.h"
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#include "nsCOMPtr.h"
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#include "nsCOMArray.h"
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#include "nsString.h"
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#include "nsURIHashKey.h"
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#include "nsInterfaceHashtable.h"
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#include "nsDataHashtable.h"
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#include "nsAutoPtr.h"
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#include "nsTArray.h"
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#include "nsIPrincipal.h"
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/**
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* OVERALL ARCHITECTURE
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*
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* The CSS Loader gets requests to load various sorts of style sheets:
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* inline style from <style> elements, linked style, @import-ed child
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* sheets, non-document sheets. The loader handles the following tasks:
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*
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* 1) Checking whether the load is allowed: CheckLoadAllowed()
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* 2) Creation of the actual style sheet objects: CreateSheet()
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* 3) setting of the right media, title, enabled state, etc on the
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* sheet: PrepareSheet()
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* 4) Insertion of the sheet in the proper cascade order:
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* InsertSheetInDoc() and InsertChildSheet()
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* 5) Load of the sheet: LoadSheet()
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* 6) Parsing of the sheet: ParseSheet()
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* 7) Cleanup: SheetComplete()
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*
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* The detailed documentation for these functions is found with the
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* function implementations.
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*
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* The following helper object is used:
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* SheetLoadData -- a small class that is used to store all the
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* information needed for the loading of a sheet;
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* this class handles listening for the stream
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* loader completion and also handles charset
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* determination.
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*/
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/*********************************************
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* Data needed to properly load a stylesheet *
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*********************************************/
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class SheetLoadData : public nsIRunnable,
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public nsIUnicharStreamLoaderObserver
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{
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public:
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virtual ~SheetLoadData(void);
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// Data for loading a sheet linked from a document
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SheetLoadData(CSSLoaderImpl* aLoader,
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const nsSubstring& aTitle,
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nsIURI* aURI,
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nsICSSStyleSheet* aSheet,
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nsIStyleSheetLinkingElement* aOwningElement,
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PRBool aIsAlternate,
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nsICSSLoaderObserver* aObserver,
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nsIPrincipal* aLoaderPrincipal);
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// Data for loading a sheet linked from an @import rule
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SheetLoadData(CSSLoaderImpl* aLoader,
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nsIURI* aURI,
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nsICSSStyleSheet* aSheet,
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SheetLoadData* aParentData,
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nsICSSLoaderObserver* aObserver,
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nsIPrincipal* aLoaderPrincipal);
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// Data for loading a non-document sheet
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SheetLoadData(CSSLoaderImpl* aLoader,
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nsIURI* aURI,
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nsICSSStyleSheet* aSheet,
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PRBool aSyncLoad,
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PRBool aAllowUnsafeRules,
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nsICSSLoaderObserver* aObserver);
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already_AddRefed<nsIURI> GetReferrerURI();
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NS_DECL_ISUPPORTS
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NS_DECL_NSIRUNNABLE
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NS_DECL_NSIUNICHARSTREAMLOADEROBSERVER
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// Hold a ref to the CSSLoader so we can call back to it to let it
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// know the load finished
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CSSLoaderImpl* mLoader; // strong ref
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// Title needed to pull datas out of the pending datas table when
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// the preferred title is changed
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nsString mTitle;
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// Charset we decided to use for the sheet
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nsCString mCharset;
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// URI we're loading. Null for inline sheets
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nsCOMPtr<nsIURI> mURI;
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// Should be 1 for non-inline sheets.
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PRUint32 mLineNumber;
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// The sheet we're loading data for
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nsCOMPtr<nsICSSStyleSheet> mSheet;
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// Linked list of datas for the same URI as us
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SheetLoadData* mNext; // strong ref
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// Load data for the sheet that @import-ed us if we were @import-ed
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// during the parse
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SheetLoadData* mParentData; // strong ref
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// Number of sheets we @import-ed that are still loading
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PRUint32 mPendingChildren;
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// mSyncLoad is true when the load needs to be synchronous -- right
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// now only for LoadSheetSync and children of sync loads.
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PRPackedBool mSyncLoad : 1;
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// mIsNonDocumentSheet is true if the load was triggered by LoadSheetSync or
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// LoadSheet or an @import from such a sheet. Non-document sheet loads can
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// proceed even if we have no document.
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PRPackedBool mIsNonDocumentSheet : 1;
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// mIsLoading is true from the moment we are placed in the loader's
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// "loading datas" table (right after the async channel is opened)
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// to the moment we are removed from said table (due to the load
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// completing or being cancelled).
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PRPackedBool mIsLoading : 1;
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// mIsCancelled is set to true when a sheet load is stopped by
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// Stop() or StopLoadingSheet(). SheetLoadData::OnStreamComplete()
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// checks this to avoid parsing sheets that have been cancelled and
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// such.
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PRPackedBool mIsCancelled : 1;
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// mMustNotify is true if the load data is being loaded async and
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// the original function call that started the load has returned.
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// XXXbz sort our relationship with load/error events!
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PRPackedBool mMustNotify : 1;
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// mWasAlternate is true if the sheet was an alternate when the load data was
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// created.
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PRPackedBool mWasAlternate : 1;
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// mAllowUnsafeRules is true if we should allow unsafe rules to be parsed
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// in the loaded sheet.
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PRPackedBool mAllowUnsafeRules : 1;
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// This is the element that imported the sheet. Needed to get the
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// charset set on it.
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nsCOMPtr<nsIStyleSheetLinkingElement> mOwningElement;
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// The observer that wishes to be notified of load completion
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nsCOMPtr<nsICSSLoaderObserver> mObserver;
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// The principal that identifies who started loading us.
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nsCOMPtr<nsIPrincipal> mLoaderPrincipal;
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};
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class nsURIAndPrincipalHashKey : public nsURIHashKey
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{
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public:
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typedef nsURIAndPrincipalHashKey* KeyType;
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typedef const nsURIAndPrincipalHashKey* KeyTypePointer;
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nsURIAndPrincipalHashKey(const nsURIAndPrincipalHashKey* aKey)
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: nsURIHashKey(aKey->mKey), mPrincipal(aKey->mPrincipal)
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{
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MOZ_COUNT_CTOR(nsURIAndPrincipalHashKey);
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}
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nsURIAndPrincipalHashKey(nsIURI* aURI, nsIPrincipal* aPrincipal)
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: nsURIHashKey(aURI), mPrincipal(aPrincipal)
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{
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MOZ_COUNT_CTOR(nsURIAndPrincipalHashKey);
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}
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nsURIAndPrincipalHashKey(const nsURIAndPrincipalHashKey& toCopy)
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: nsURIHashKey(toCopy), mPrincipal(toCopy.mPrincipal)
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{
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MOZ_COUNT_CTOR(nsURIAndPrincipalHashKey);
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}
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~nsURIAndPrincipalHashKey()
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{
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MOZ_COUNT_DTOR(nsURIAndPrincipalHashKey);
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}
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nsURIAndPrincipalHashKey* GetKey() const {
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return NS_CONST_CAST(nsURIAndPrincipalHashKey*, this);
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}
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const nsURIAndPrincipalHashKey* GetKeyPointer() const { return this; }
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PRBool KeyEquals(const nsURIAndPrincipalHashKey* aKey) const {
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if (!nsURIHashKey::KeyEquals(aKey->mKey)) {
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return PR_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 PR_FALSE;
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}
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PRBool 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 nsURIAndPrincipalHashKey*
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KeyToPointer(nsURIAndPrincipalHashKey* aKey) { return aKey; }
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static PLDHashNumber HashKey(const nsURIAndPrincipalHashKey* aKey) {
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return nsURIHashKey::HashKey(aKey->mKey);
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}
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enum { ALLOW_MEMMOVE = PR_TRUE };
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protected:
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nsCOMPtr<nsIPrincipal> mPrincipal;
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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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* Loader Declaration *
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**********************/
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class CSSLoaderImpl : public nsICSSLoader
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{
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public:
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CSSLoaderImpl(void);
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virtual ~CSSLoaderImpl(void);
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NS_DECL_ISUPPORTS
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static void Shutdown(); // called at app shutdown
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// nsICSSLoader methods
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NS_IMETHOD Init(nsIDocument* aDocument);
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NS_IMETHOD DropDocumentReference(void);
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NS_IMETHOD SetCaseSensitive(PRBool aCaseSensitive);
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NS_IMETHOD SetCompatibilityMode(nsCompatibility aCompatMode);
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NS_IMETHOD SetPreferredSheet(const nsAString& aTitle);
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NS_IMETHOD GetPreferredSheet(nsAString& aTitle);
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NS_IMETHOD GetParserFor(nsICSSStyleSheet* aSheet,
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nsICSSParser** aParser);
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NS_IMETHOD RecycleParser(nsICSSParser* aParser);
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NS_IMETHOD LoadInlineStyle(nsIContent* aElement,
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nsIUnicharInputStream* aStream,
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PRUint32 aLineNumber,
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const nsSubstring& aTitle,
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const nsSubstring& aMedia,
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nsICSSLoaderObserver* aObserver,
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PRBool* aCompleted,
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PRBool* aIsAlternate);
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NS_IMETHOD LoadStyleLink(nsIContent* aElement,
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nsIURI* aURL,
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const nsSubstring& aTitle,
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const nsSubstring& aMedia,
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PRBool aHasAlternateRel,
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nsICSSLoaderObserver* aObserver,
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PRBool* aIsAlternate);
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NS_IMETHOD LoadChildSheet(nsICSSStyleSheet* aParentSheet,
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nsIURI* aURL,
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nsMediaList* aMedia,
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nsICSSImportRule* aRule);
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NS_IMETHOD LoadSheetSync(nsIURI* aURL, PRBool aAllowUnsafeRules,
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nsICSSStyleSheet** aSheet);
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NS_IMETHOD LoadSheet(nsIURI* aURL, nsICSSLoaderObserver* aObserver,
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nsICSSStyleSheet** aSheet);
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NS_IMETHOD LoadSheet(nsIURI* aURL, nsICSSLoaderObserver* aObserver);
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// stop loading all sheets
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NS_IMETHOD Stop(void);
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// stop loading one sheet
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NS_IMETHOD StopLoadingSheet(nsIURI* aURL);
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/**
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* Is the loader 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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NS_IMETHOD GetEnabled(PRBool *aEnabled);
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NS_IMETHOD SetEnabled(PRBool aEnabled);
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// local helper methods (some are public for access from statics)
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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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PRBool IsAlternate(const nsAString& aTitle, PRBool aHasAlternateRel);
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private:
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nsresult CheckLoadAllowed(nsIURI* aSourceURI,
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nsIPrincipal* aSourcePrincipal,
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nsIURI* aTargetURI,
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nsISupports* aContext);
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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.
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nsresult CreateSheet(nsIURI* aURI,
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nsIContent* aLinkingContent,
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nsIPrincipal* aLoaderPrincipal,
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PRBool aSyncLoad,
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StyleSheetState& aSheetState,
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nsICSSStyleSheet** aSheet);
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// Pass in either a media string or the nsMediaList from the
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// CSSParser. Don't pass both.
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// If aIsAlternate is non-null, this method will set *aIsAlternate to
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// correspond to the sheet's enabled state (which it will set no matter what)
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nsresult PrepareSheet(nsICSSStyleSheet* aSheet,
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const nsSubstring& aTitle,
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const nsSubstring& aMediaString,
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nsMediaList* aMediaList,
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PRBool aHasAlternateRel = PR_FALSE,
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PRBool *aIsAlternate = nsnull);
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nsresult InsertSheetInDoc(nsICSSStyleSheet* aSheet,
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nsIContent* aLinkingContent,
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nsIDocument* aDocument);
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nsresult InsertChildSheet(nsICSSStyleSheet* aSheet,
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nsICSSStyleSheet* aParentSheet,
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nsICSSImportRule* aParentRule);
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nsresult InternalLoadNonDocumentSheet(nsIURI* aURL,
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PRBool aAllowUnsafeRules,
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nsICSSStyleSheet** aSheet,
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nsICSSLoaderObserver* aObserver);
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// Post a load event for aObserver to be notified about aSheet. The
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// notification will be sent with status NS_OK unless the load event is
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// canceled at some point (in which case it will be sent with
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// NS_BINDING_ABORTED). aWasAlternate indicates the state when the load was
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// initiated, not the state at some later time. aURI should be the URI the
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// sheet was loaded from (may be null for inline sheets).
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nsresult PostLoadEvent(nsIURI* aURI,
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nsICSSStyleSheet* aSheet,
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nsICSSLoaderObserver* aObserver,
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PRBool aWasAlternate);
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public:
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// Handle an event posted by PostLoadEvent
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void HandleLoadEvent(SheetLoadData* aEvent);
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// Note: LoadSheet is responsible for releasing aLoadData and setting the
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// sheet to complete on failure.
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nsresult LoadSheet(SheetLoadData* aLoadData, StyleSheetState aSheetState);
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protected:
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friend class SheetLoadData;
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// Protected functions and members are ones that SheetLoadData needs
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// access to.
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// Parse the stylesheet in aLoadData. The sheet data comes from aStream.
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// Set aCompleted to true if the parse finished, false otherwise (e.g. if the
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// sheet had an @import). If aCompleted is true when this returns, then
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// ParseSheet also called SheetComplete on aLoadData
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nsresult ParseSheet(nsIUnicharInputStream* aStream,
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SheetLoadData* aLoadData,
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PRBool& aCompleted);
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public:
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// The load of the sheet in aLoadData is done, one way or another. Do final
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// cleanup, including releasing aLoadData.
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void SheetComplete(SheetLoadData* aLoadData, nsresult aStatus);
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private:
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typedef nsTArray<nsRefPtr<SheetLoadData> > LoadDataArray;
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// The guts of SheetComplete. This may be called recursively on parent datas
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// or datas that had glommed on to a single load. The array is there so load
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// datas whose observers need to be notified can be added to it.
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void DoSheetComplete(SheetLoadData* aLoadData, nsresult aStatus,
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LoadDataArray& aDatasToNotify);
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static nsCOMArray<nsICSSParser>* gParsers; // array of idle CSS parsers
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// the load data needs access to the document...
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nsIDocument* mDocument; // the document we live for
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#ifdef DEBUG
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PRPackedBool mSyncCallback;
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#endif
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PRPackedBool mCaseSensitive; // is document CSS case sensitive
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PRPackedBool mEnabled; // is enabled to load new styles
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nsCompatibility mCompatMode;
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nsString mPreferredSheet; // title of preferred sheet
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nsInterfaceHashtable<nsURIAndPrincipalHashKey,
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nsICSSStyleSheet> mCompleteSheets;
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nsDataHashtable<nsURIAndPrincipalHashKey,
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SheetLoadData*> mLoadingDatas; // weak refs
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nsDataHashtable<nsURIAndPrincipalHashKey,
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SheetLoadData*> mPendingDatas; // weak refs
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// We're not likely to have many levels of @import... But likely to have
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// some. Allocate some storage, what the hell.
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nsAutoVoidArray mParsingDatas;
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// The array of posted stylesheet loaded events (SheetLoadDatas) we have.
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// Note that these are rare.
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LoadDataArray mPostedEvents;
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};
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#endif // nsCSSLoader_h__
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