зеркало из https://github.com/mozilla/pjs.git
403 строки
12 KiB
C++
403 строки
12 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 sw=2 et tw=78: */
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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) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Mark Hammond <mhammond@skippinet.com.au>
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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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#include "nsCOMPtr.h"
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#include "nsIScriptContext.h"
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#include "nsIArray.h"
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#include "nsIScriptTimeoutHandler.h"
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#include "nsIXPConnect.h"
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#include "nsIJSRuntimeService.h"
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#include "nsJSUtils.h"
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#include "nsDOMJSUtils.h"
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#include "nsContentUtils.h"
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#include "nsJSEnvironment.h"
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#include "nsServiceManagerUtils.h"
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#include "nsDOMError.h"
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#include "nsGlobalWindow.h"
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#include "jsobj.h"
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#include "jsatom.h"
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#include "jsfun.h"
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#include "nsIContentSecurityPolicy.h"
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static const char kSetIntervalStr[] = "setInterval";
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static const char kSetTimeoutStr[] = "setTimeout";
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// Our JS nsIScriptTimeoutHandler implementation.
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class nsJSScriptTimeoutHandler: public nsIScriptTimeoutHandler
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{
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public:
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// nsISupports
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsJSScriptTimeoutHandler)
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nsJSScriptTimeoutHandler();
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~nsJSScriptTimeoutHandler();
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virtual const PRUnichar *GetHandlerText();
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virtual void *GetScriptObject() {
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return mFunObj;
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}
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virtual void GetLocation(const char **aFileName, PRUint32 *aLineNo) {
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*aFileName = mFileName.get();
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*aLineNo = mLineNo;
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}
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virtual PRUint32 GetScriptTypeID() {
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return nsIProgrammingLanguage::JAVASCRIPT;
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}
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virtual PRUint32 GetScriptVersion() {
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return mVersion;
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}
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virtual nsIArray *GetArgv() {
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return mArgv;
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}
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// Called by the timeout mechanism so the secret 'lateness' arg can be
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// added.
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virtual void SetLateness(PRIntervalTime aHowLate);
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nsresult Init(nsGlobalWindow *aWindow, PRBool *aIsInterval,
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PRInt32 *aInterval);
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void ReleaseJSObjects();
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private:
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nsCOMPtr<nsIScriptContext> mContext;
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// filename, line number and JS language version string of the
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// caller of setTimeout()
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nsCString mFileName;
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PRUint32 mLineNo;
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PRUint32 mVersion;
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nsCOMPtr<nsIArray> mArgv;
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// The JS expression to evaluate or function to call, if !mExpr
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JSFlatString *mExpr;
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JSObject *mFunObj;
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};
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// nsJSScriptTimeoutHandler
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// QueryInterface implementation for nsJSScriptTimeoutHandler
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NS_IMPL_CYCLE_COLLECTION_CLASS(nsJSScriptTimeoutHandler)
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NS_IMPL_CYCLE_COLLECTION_ROOT_BEGIN(nsJSScriptTimeoutHandler)
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tmp->ReleaseJSObjects();
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NS_IMPL_CYCLE_COLLECTION_ROOT_END
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NS_IMPL_CYCLE_COLLECTION_UNLINK_0(nsJSScriptTimeoutHandler)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(nsJSScriptTimeoutHandler)
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if (NS_UNLIKELY(cb.WantDebugInfo())) {
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nsCAutoString foo("nsJSScriptTimeoutHandler");
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if (tmp->mExpr) {
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foo.AppendLiteral(" [");
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foo.Append(tmp->mFileName);
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foo.AppendLiteral(":");
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foo.AppendInt(tmp->mLineNo);
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foo.AppendLiteral("]");
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}
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else if (tmp->mFunObj) {
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JSFunction* fun = (JSFunction*)tmp->mFunObj->getPrivate();
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if (fun->atom) {
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size_t size = 1 + JS_PutEscapedFlatString(NULL, 0, ATOM_TO_STRING(fun->atom), 0);
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char *name = new char[size];
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if (name) {
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JS_PutEscapedFlatString(name, size, ATOM_TO_STRING(fun->atom), 0);
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foo.AppendLiteral(" [");
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foo.Append(name);
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delete[] name;
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foo.AppendLiteral("]");
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}
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}
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}
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cb.DescribeNode(RefCounted, tmp->mRefCnt.get(),
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sizeof(nsJSScriptTimeoutHandler), foo.get());
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}
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else {
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cb.DescribeNode(RefCounted, tmp->mRefCnt.get(),
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sizeof(nsJSScriptTimeoutHandler),
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"nsJSScriptTimeoutHandler");
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}
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mContext)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mArgv)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsJSScriptTimeoutHandler)
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NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mExpr)
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NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mFunObj)
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NS_IMPL_CYCLE_COLLECTION_TRACE_END
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsJSScriptTimeoutHandler)
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NS_INTERFACE_MAP_ENTRY(nsIScriptTimeoutHandler)
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NS_INTERFACE_MAP_ENTRY(nsISupports)
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NS_INTERFACE_MAP_END
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NS_IMPL_CYCLE_COLLECTING_ADDREF(nsJSScriptTimeoutHandler)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(nsJSScriptTimeoutHandler)
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nsJSScriptTimeoutHandler::nsJSScriptTimeoutHandler() :
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mLineNo(0),
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mVersion(nsnull),
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mExpr(nsnull),
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mFunObj(nsnull)
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{
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}
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nsJSScriptTimeoutHandler::~nsJSScriptTimeoutHandler()
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{
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ReleaseJSObjects();
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}
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void
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nsJSScriptTimeoutHandler::ReleaseJSObjects()
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{
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if (mExpr || mFunObj) {
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if (mExpr) {
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NS_DROP_JS_OBJECTS(this, nsJSScriptTimeoutHandler);
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mExpr = nsnull;
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} else if (mFunObj) {
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NS_DROP_JS_OBJECTS(this, nsJSScriptTimeoutHandler);
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mFunObj = nsnull;
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} else {
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NS_WARNING("No func and no expr - roots may not have been removed");
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}
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}
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}
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nsresult
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nsJSScriptTimeoutHandler::Init(nsGlobalWindow *aWindow, PRBool *aIsInterval,
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PRInt32 *aInterval)
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{
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mContext = aWindow->GetContextInternal();
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if (!mContext) {
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// This window was already closed, or never properly initialized,
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// don't let a timer be scheduled on such a window.
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return NS_ERROR_NOT_INITIALIZED;
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}
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nsAXPCNativeCallContext *ncc = nsnull;
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nsresult rv = nsContentUtils::XPConnect()->
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GetCurrentNativeCallContext(&ncc);
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NS_ENSURE_SUCCESS(rv, rv);
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if (!ncc)
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return NS_ERROR_NOT_AVAILABLE;
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JSContext *cx = nsnull;
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rv = ncc->GetJSContext(&cx);
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NS_ENSURE_SUCCESS(rv, rv);
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PRUint32 argc;
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jsval *argv = nsnull;
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ncc->GetArgc(&argc);
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ncc->GetArgvPtr(&argv);
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JSFlatString *expr = nsnull;
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JSObject *funobj = nsnull;
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int32 interval = 0;
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JSAutoRequest ar(cx);
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if (argc < 1) {
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::JS_ReportError(cx, "Function %s requires at least 2 parameter",
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*aIsInterval ? kSetIntervalStr : kSetTimeoutStr);
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return NS_ERROR_DOM_TYPE_ERR;
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}
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if (argc > 1 && !::JS_ValueToECMAInt32(cx, argv[1], &interval)) {
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::JS_ReportError(cx,
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"Second argument to %s must be a millisecond interval",
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aIsInterval ? kSetIntervalStr : kSetTimeoutStr);
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return NS_ERROR_DOM_TYPE_ERR;
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}
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if (argc == 1) {
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// If no interval was specified, treat this like a timeout, to avoid
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// setting an interval of 0 milliseconds.
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*aIsInterval = PR_FALSE;
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}
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switch (::JS_TypeOfValue(cx, argv[0])) {
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case JSTYPE_FUNCTION:
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funobj = JSVAL_TO_OBJECT(argv[0]);
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break;
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case JSTYPE_STRING:
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case JSTYPE_OBJECT:
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{
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JSString *str = ::JS_ValueToString(cx, argv[0]);
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if (!str)
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return NS_ERROR_OUT_OF_MEMORY;
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expr = ::JS_FlattenString(cx, str);
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if (!expr)
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return NS_ERROR_OUT_OF_MEMORY;
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argv[0] = STRING_TO_JSVAL(str);
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}
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break;
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default:
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::JS_ReportError(cx, "useless %s call (missing quotes around argument?)",
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*aIsInterval ? kSetIntervalStr : kSetTimeoutStr);
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// Return an error that nsGlobalWindow can recognize and turn into NS_OK.
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return NS_ERROR_DOM_TYPE_ERR;
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}
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if (expr) {
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// if CSP is enabled, and setTimeout/setInterval was called with a string
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// or object, disable the registration and log an error
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nsCOMPtr<nsIDocument> doc = do_QueryInterface(aWindow->GetExtantDocument());
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if (doc) {
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nsCOMPtr<nsIContentSecurityPolicy> csp;
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nsresult rv = doc->NodePrincipal()->GetCsp(getter_AddRefs(csp));
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NS_ENSURE_SUCCESS(rv, rv);
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if (csp) {
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PRBool allowsEval;
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// this call will send violation reports as warranted (and return true if
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// reportOnly is set).
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rv = csp->GetAllowsEval(&allowsEval);
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NS_ENSURE_SUCCESS(rv, rv);
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if (!allowsEval) {
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::JS_ReportError(cx, "call to %s blocked by CSP",
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*aIsInterval ? kSetIntervalStr : kSetTimeoutStr);
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// Note: Our only caller knows to turn NS_ERROR_DOM_TYPE_ERR into NS_OK.
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return NS_ERROR_DOM_TYPE_ERR;
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}
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}
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} // if there's no document, we don't have to do anything.
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rv = NS_HOLD_JS_OBJECTS(this, nsJSScriptTimeoutHandler);
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NS_ENSURE_SUCCESS(rv, rv);
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mExpr = expr;
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nsIPrincipal *prin = aWindow->GetPrincipal();
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// Get the calling location.
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const char *filename;
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if (nsJSUtils::GetCallingLocation(cx, &filename, &mLineNo, prin)) {
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mFileName.Assign(filename);
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}
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} else if (funobj) {
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rv = NS_HOLD_JS_OBJECTS(this, nsJSScriptTimeoutHandler);
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NS_ENSURE_SUCCESS(rv, rv);
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mFunObj = funobj;
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// Create our arg array - leave an extra slot for a secret final argument
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// that indicates to the called function how "late" the timeout is. We
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// will fill that in when SetLateness is called.
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nsCOMPtr<nsIArray> array;
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rv = NS_CreateJSArgv(cx, (argc > 1) ? argc - 1 : argc, nsnull,
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getter_AddRefs(array));
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if (NS_FAILED(rv)) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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PRUint32 dummy;
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jsval *jsargv = nsnull;
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nsCOMPtr<nsIJSArgArray> jsarray(do_QueryInterface(array));
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jsarray->GetArgs(&dummy, reinterpret_cast<void **>(&jsargv));
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// must have worked - we own the impl! :)
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NS_ASSERTION(jsargv, "No argv!");
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for (PRInt32 i = 2; (PRUint32)i < argc; ++i) {
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jsargv[i - 2] = argv[i];
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}
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// final arg slot remains null, array has rooted vals.
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mArgv = array;
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} else {
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NS_WARNING("No func and no expr - why are we here?");
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}
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*aInterval = interval;
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return NS_OK;
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}
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void nsJSScriptTimeoutHandler::SetLateness(PRIntervalTime aHowLate)
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{
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nsCOMPtr<nsIJSArgArray> jsarray(do_QueryInterface(mArgv));
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if (jsarray) {
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PRUint32 argc;
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jsval *jsargv;
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nsresult rv = jsarray->GetArgs(&argc, reinterpret_cast<void **>(&jsargv));
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if (NS_SUCCEEDED(rv) && jsargv && argc)
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jsargv[argc-1] = INT_TO_JSVAL((jsint) aHowLate);
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} else {
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NS_ERROR("How can our argv not handle this?");
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}
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}
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const PRUnichar *
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nsJSScriptTimeoutHandler::GetHandlerText()
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{
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NS_ASSERTION(mExpr, "No expression, so no handler text!");
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return ::JS_GetFlatStringChars(mExpr);
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}
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nsresult NS_CreateJSTimeoutHandler(nsGlobalWindow *aWindow,
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PRBool *aIsInterval,
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PRInt32 *aInterval,
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nsIScriptTimeoutHandler **aRet)
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{
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*aRet = nsnull;
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nsJSScriptTimeoutHandler *handler = new nsJSScriptTimeoutHandler();
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if (!handler)
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return NS_ERROR_OUT_OF_MEMORY;
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nsresult rv = handler->Init(aWindow, aIsInterval, aInterval);
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if (NS_FAILED(rv)) {
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delete handler;
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return rv;
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}
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NS_ADDREF(*aRet = handler);
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return NS_OK;
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}
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