gecko-dev/dom/base/nsJSTimeoutHandler.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et tw=78: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Mark Hammond <mhammond@skippinet.com.au>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsCOMPtr.h"
#include "nsIScriptContext.h"
#include "nsIArray.h"
#include "nsIScriptTimeoutHandler.h"
#include "nsIXPConnect.h"
#include "nsIJSRuntimeService.h"
#include "nsJSUtils.h"
#include "nsDOMJSUtils.h"
#include "nsContentUtils.h"
#include "nsJSEnvironment.h"
#include "nsServiceManagerUtils.h"
#include "nsDOMError.h"
#include "nsGlobalWindow.h"
#include "nsIContentSecurityPolicy.h"
static const char kSetIntervalStr[] = "setInterval";
static const char kSetTimeoutStr[] = "setTimeout";
// Our JS nsIScriptTimeoutHandler implementation.
class nsJSScriptTimeoutHandler: public nsIScriptTimeoutHandler
{
public:
// nsISupports
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsJSScriptTimeoutHandler)
nsJSScriptTimeoutHandler();
~nsJSScriptTimeoutHandler();
virtual const PRUnichar *GetHandlerText();
virtual void *GetScriptObject() {
return mFunObj;
}
virtual void GetLocation(const char **aFileName, PRUint32 *aLineNo) {
*aFileName = mFileName.get();
*aLineNo = mLineNo;
}
virtual PRUint32 GetScriptTypeID() {
return nsIProgrammingLanguage::JAVASCRIPT;
}
virtual PRUint32 GetScriptVersion() {
return mVersion;
}
virtual nsIArray *GetArgv() {
return mArgv;
}
// Called by the timeout mechanism so the secret 'lateness' arg can be
// added.
virtual void SetLateness(PRIntervalTime aHowLate);
nsresult Init(nsGlobalWindow *aWindow, PRBool *aIsInterval,
PRInt32 *aInterval);
void ReleaseJSObjects();
private:
nsCOMPtr<nsIScriptContext> mContext;
// filename, line number and JS language version string of the
// caller of setTimeout()
nsCString mFileName;
PRUint32 mLineNo;
PRUint32 mVersion;
nsCOMPtr<nsIArray> mArgv;
// The JS expression to evaluate or function to call, if !mExpr
JSString *mExpr;
JSObject *mFunObj;
};
// nsJSScriptTimeoutHandler
// QueryInterface implementation for nsJSScriptTimeoutHandler
NS_IMPL_CYCLE_COLLECTION_CLASS(nsJSScriptTimeoutHandler)
NS_IMPL_CYCLE_COLLECTION_ROOT_BEGIN(nsJSScriptTimeoutHandler)
tmp->ReleaseJSObjects();
NS_IMPL_CYCLE_COLLECTION_ROOT_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_0(nsJSScriptTimeoutHandler)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsJSScriptTimeoutHandler)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mContext)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mArgv)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsJSScriptTimeoutHandler)
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mExpr)
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mFunObj)
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsJSScriptTimeoutHandler)
NS_INTERFACE_MAP_ENTRY(nsIScriptTimeoutHandler)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsJSScriptTimeoutHandler)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsJSScriptTimeoutHandler)
nsJSScriptTimeoutHandler::nsJSScriptTimeoutHandler() :
mLineNo(0),
mVersion(nsnull),
mExpr(nsnull),
mFunObj(nsnull)
{
}
nsJSScriptTimeoutHandler::~nsJSScriptTimeoutHandler()
{
ReleaseJSObjects();
}
void
nsJSScriptTimeoutHandler::ReleaseJSObjects()
{
if (mExpr || mFunObj) {
if (mExpr) {
NS_DROP_JS_OBJECTS(this, nsJSScriptTimeoutHandler);
mExpr = nsnull;
} else if (mFunObj) {
NS_DROP_JS_OBJECTS(this, nsJSScriptTimeoutHandler);
mFunObj = nsnull;
} else {
NS_WARNING("No func and no expr - roots may not have been removed");
}
}
}
nsresult
nsJSScriptTimeoutHandler::Init(nsGlobalWindow *aWindow, PRBool *aIsInterval,
PRInt32 *aInterval)
{
mContext = aWindow->GetContextInternal();
if (!mContext) {
// This window was already closed, or never properly initialized,
// don't let a timer be scheduled on such a window.
return NS_ERROR_NOT_INITIALIZED;
}
nsAXPCNativeCallContext *ncc = nsnull;
nsresult rv = nsContentUtils::XPConnect()->
GetCurrentNativeCallContext(&ncc);
NS_ENSURE_SUCCESS(rv, rv);
if (!ncc)
return NS_ERROR_NOT_AVAILABLE;
JSContext *cx = nsnull;
rv = ncc->GetJSContext(&cx);
NS_ENSURE_SUCCESS(rv, rv);
PRUint32 argc;
jsval *argv = nsnull;
ncc->GetArgc(&argc);
ncc->GetArgvPtr(&argv);
JSString *expr = nsnull;
JSObject *funobj = nsnull;
int32 interval = 0;
JSAutoRequest ar(cx);
if (argc < 1) {
::JS_ReportError(cx, "Function %s requires at least 2 parameter",
*aIsInterval ? kSetIntervalStr : kSetTimeoutStr);
return NS_ERROR_DOM_TYPE_ERR;
}
if (argc > 1 && !::JS_ValueToECMAInt32(cx, argv[1], &interval)) {
::JS_ReportError(cx,
"Second argument to %s must be a millisecond interval",
aIsInterval ? kSetIntervalStr : kSetTimeoutStr);
return NS_ERROR_DOM_TYPE_ERR;
}
if (argc == 1) {
// If no interval was specified, treat this like a timeout, to avoid
// setting an interval of 0 milliseconds.
*aIsInterval = PR_FALSE;
}
switch (::JS_TypeOfValue(cx, argv[0])) {
case JSTYPE_FUNCTION:
funobj = JSVAL_TO_OBJECT(argv[0]);
break;
case JSTYPE_STRING:
case JSTYPE_OBJECT:
expr = ::JS_ValueToString(cx, argv[0]);
if (!expr)
return NS_ERROR_OUT_OF_MEMORY;
argv[0] = STRING_TO_JSVAL(expr);
break;
default:
::JS_ReportError(cx, "useless %s call (missing quotes around argument?)",
*aIsInterval ? kSetIntervalStr : kSetTimeoutStr);
// Return an error that nsGlobalWindow can recognize and turn into NS_OK.
return NS_ERROR_DOM_TYPE_ERR;
}
if (expr) {
// if CSP is enabled, and setTimeout/setInterval was called with a string
// or object, disable the registration and log an error
nsCOMPtr<nsIDocument> doc = do_QueryInterface(aWindow->GetExtantDocument());
if (doc) {
nsCOMPtr<nsIContentSecurityPolicy> csp;
nsresult rv = doc->NodePrincipal()->GetCsp(getter_AddRefs(csp));
NS_ENSURE_SUCCESS(rv, rv);
if (csp) {
PRBool allowsEval;
// this call will send violation reports as warranted (and return true if
// reportOnly is set).
rv = csp->GetAllowsEval(&allowsEval);
NS_ENSURE_SUCCESS(rv, rv);
if (!allowsEval) {
::JS_ReportError(cx, "call to %s blocked by CSP",
*aIsInterval ? kSetIntervalStr : kSetTimeoutStr);
// Note: Our only caller knows to turn NS_ERROR_DOM_TYPE_ERR into NS_OK.
return NS_ERROR_DOM_TYPE_ERR;
}
}
} // if there's no document, we don't have to do anything.
rv = NS_HOLD_JS_OBJECTS(this, nsJSScriptTimeoutHandler);
NS_ENSURE_SUCCESS(rv, rv);
mExpr = expr;
nsIPrincipal *prin = aWindow->GetPrincipal();
// Get the calling location.
const char *filename;
if (nsJSUtils::GetCallingLocation(cx, &filename, &mLineNo, prin)) {
mFileName.Assign(filename);
}
} else if (funobj) {
rv = NS_HOLD_JS_OBJECTS(this, nsJSScriptTimeoutHandler);
NS_ENSURE_SUCCESS(rv, rv);
mFunObj = funobj;
// Create our arg array - leave an extra slot for a secret final argument
// that indicates to the called function how "late" the timeout is. We
// will fill that in when SetLateness is called.
nsCOMPtr<nsIArray> array;
rv = NS_CreateJSArgv(cx, (argc > 1) ? argc - 1 : argc, nsnull,
getter_AddRefs(array));
if (NS_FAILED(rv)) {
return NS_ERROR_OUT_OF_MEMORY;
}
PRUint32 dummy;
jsval *jsargv = nsnull;
nsCOMPtr<nsIJSArgArray> jsarray(do_QueryInterface(array));
jsarray->GetArgs(&dummy, reinterpret_cast<void **>(&jsargv));
// must have worked - we own the impl! :)
NS_ASSERTION(jsargv, "No argv!");
for (PRInt32 i = 2; (PRUint32)i < argc; ++i) {
jsargv[i - 2] = argv[i];
}
// final arg slot remains null, array has rooted vals.
mArgv = array;
} else {
NS_WARNING("No func and no expr - why are we here?");
}
*aInterval = interval;
return NS_OK;
}
void nsJSScriptTimeoutHandler::SetLateness(PRIntervalTime aHowLate)
{
nsCOMPtr<nsIJSArgArray> jsarray(do_QueryInterface(mArgv));
if (jsarray) {
PRUint32 argc;
jsval *jsargv;
nsresult rv = jsarray->GetArgs(&argc, reinterpret_cast<void **>(&jsargv));
if (NS_SUCCEEDED(rv) && jsargv && argc)
jsargv[argc-1] = INT_TO_JSVAL((jsint) aHowLate);
} else {
NS_ERROR("How can our argv not handle this?");
}
}
const PRUnichar *
nsJSScriptTimeoutHandler::GetHandlerText()
{
NS_ASSERTION(mExpr, "No expression, so no handler text!");
return reinterpret_cast<const PRUnichar *>
(::JS_GetStringChars(mExpr));
}
nsresult NS_CreateJSTimeoutHandler(nsGlobalWindow *aWindow,
PRBool *aIsInterval,
PRInt32 *aInterval,
nsIScriptTimeoutHandler **aRet)
{
*aRet = nsnull;
nsJSScriptTimeoutHandler *handler = new nsJSScriptTimeoutHandler();
if (!handler)
return NS_ERROR_OUT_OF_MEMORY;
nsresult rv = handler->Init(aWindow, aIsInterval, aInterval);
if (NS_FAILED(rv)) {
delete handler;
return rv;
}
NS_ADDREF(*aRet = handler);
return NS_OK;
}