gecko-dev/dom/base/nsJSTimeoutHandler.cpp

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C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
#include <algorithm>
#include "mozilla/Attributes.h"
#include "mozilla/Likely.h"
#include "mozilla/Maybe.h"
#include "mozilla/dom/FunctionBinding.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "nsCOMPtr.h"
#include "nsContentUtils.h"
#include "nsError.h"
#include "nsGlobalWindow.h"
#include "nsIContentSecurityPolicy.h"
#include "nsIDocument.h"
#include "nsIScriptTimeoutHandler.h"
#include "nsIXPConnect.h"
#include "nsJSUtils.h"
using namespace mozilla;
using namespace mozilla::dom;
// Our JS nsIScriptTimeoutHandler implementation.
class nsJSScriptTimeoutHandler final : public nsIScriptTimeoutHandler
{
public:
// nsISupports
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsJSScriptTimeoutHandler)
nsJSScriptTimeoutHandler();
// This will call SwapElements on aArguments with an empty array.
nsJSScriptTimeoutHandler(JSContext* aCx, nsGlobalWindowInner* aWindow,
Function& aFunction,
nsTArray<JS::Heap<JS::Value>>&& aArguments,
ErrorResult& aError);
nsJSScriptTimeoutHandler(JSContext* aCx, nsGlobalWindowInner* aWindow,
const nsAString& aExpression, bool* aAllowEval,
ErrorResult& aError);
nsJSScriptTimeoutHandler(JSContext* aCx, WorkerPrivate* aWorkerPrivate,
Function& aFunction,
nsTArray<JS::Heap<JS::Value>>&& aArguments);
nsJSScriptTimeoutHandler(JSContext* aCx, WorkerPrivate* aWorkerPrivate,
const nsAString& aExpression);
virtual const nsAString& GetHandlerText() override;
virtual Function* GetCallback() override
{
return mFunction;
}
virtual const nsTArray<JS::Value>& GetArgs() override
{
return mArgs;
}
virtual nsresult Call() override
{
return NS_OK;
}
virtual void GetLocation(const char** aFileName, uint32_t* aLineNo,
uint32_t* aColumn) override
{
*aFileName = mFileName.get();
*aLineNo = mLineNo;
*aColumn = mColumn;
}
virtual void MarkForCC() override
{
if (mFunction) {
mFunction->MarkForCC();
}
}
void ReleaseJSObjects();
private:
~nsJSScriptTimeoutHandler();
void Init(JSContext* aCx,
nsTArray<JS::Heap<JS::Value>>&& aArguments);
void Init(JSContext* aCx);
// filename, line number and JS language version string of the
// caller of setTimeout()
nsCString mFileName;
uint32_t mLineNo;
uint32_t mColumn;
nsTArray<JS::Heap<JS::Value>> mArgs;
// The expression to evaluate or function to call. If mFunction is non-null
// it should be used, else use mExpr.
nsString mExpr;
RefPtr<Function> mFunction;
};
// nsJSScriptTimeoutHandler
// QueryInterface implementation for nsJSScriptTimeoutHandler
NS_IMPL_CYCLE_COLLECTION_CLASS(nsJSScriptTimeoutHandler)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsJSScriptTimeoutHandler)
tmp->ReleaseJSObjects();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(nsJSScriptTimeoutHandler)
if (MOZ_UNLIKELY(cb.WantDebugInfo())) {
nsAutoCString name("nsJSScriptTimeoutHandler");
if (tmp->mFunction) {
JSObject* obj = tmp->mFunction->CallablePreserveColor();
JSFunction* fun = JS_GetObjectFunction(js::UncheckedUnwrapWithoutExpose(obj));
if (fun && JS_GetFunctionId(fun)) {
JSFlatString *funId = JS_ASSERT_STRING_IS_FLAT(JS_GetFunctionId(fun));
size_t size = 1 + JS_PutEscapedFlatString(nullptr, 0, funId, 0);
char *funIdName = new char[size];
if (funIdName) {
JS_PutEscapedFlatString(funIdName, size, funId, 0);
name.AppendLiteral(" [");
name.Append(funIdName);
delete[] funIdName;
name.Append(']');
}
}
} else {
name.AppendLiteral(" [");
name.Append(tmp->mFileName);
name.Append(':');
name.AppendInt(tmp->mLineNo);
name.Append(':');
name.AppendInt(tmp->mColumn);
name.Append(']');
}
cb.DescribeRefCountedNode(tmp->mRefCnt.get(), name.get());
}
else {
NS_IMPL_CYCLE_COLLECTION_DESCRIBE(nsJSScriptTimeoutHandler,
tmp->mRefCnt.get())
}
if (tmp->mFunction) {
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mFunction)
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsJSScriptTimeoutHandler)
for (uint32_t i = 0; i < tmp->mArgs.Length(); ++i) {
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mArgs[i])
}
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsJSScriptTimeoutHandler)
NS_INTERFACE_MAP_ENTRY(nsIScriptTimeoutHandler)
NS_INTERFACE_MAP_ENTRY(nsITimeoutHandler)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsJSScriptTimeoutHandler)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsJSScriptTimeoutHandler)
static bool
CheckCSPForEval(JSContext* aCx, nsGlobalWindowInner* aWindow,
const nsAString& aExpression, ErrorResult& aError)
{
// if CSP is enabled, and setTimeout/setInterval was called with a string,
// disable the registration and log an error
nsCOMPtr<nsIDocument> doc = aWindow->GetExtantDoc();
if (!doc) {
// if there's no document, we don't have to do anything.
return true;
}
nsCOMPtr<nsIContentSecurityPolicy> csp;
aError = doc->NodePrincipal()->GetCsp(getter_AddRefs(csp));
if (aError.Failed()) {
return false;
}
if (!csp) {
return true;
}
bool allowsEval = true;
bool reportViolation = false;
aError = csp->GetAllowsEval(&reportViolation, &allowsEval);
if (aError.Failed()) {
return false;
}
if (reportViolation) {
// Get the calling location.
uint32_t lineNum = 0;
uint32_t columnNum = 0;
nsAutoString fileNameString;
if (!nsJSUtils::GetCallingLocation(aCx, fileNameString, &lineNum,
&columnNum)) {
fileNameString.AssignLiteral("unknown");
}
csp->LogViolationDetails(nsIContentSecurityPolicy::VIOLATION_TYPE_EVAL,
nullptr, // triggering element
fileNameString, aExpression, lineNum, columnNum,
EmptyString(), EmptyString());
}
return allowsEval;
}
nsJSScriptTimeoutHandler::nsJSScriptTimeoutHandler()
: mLineNo(0)
, mColumn(0)
{
}
nsJSScriptTimeoutHandler::nsJSScriptTimeoutHandler(JSContext* aCx,
nsGlobalWindowInner *aWindow,
Function& aFunction,
nsTArray<JS::Heap<JS::Value>>&& aArguments,
ErrorResult& aError)
: mLineNo(0)
, mColumn(0)
, mFunction(&aFunction)
{
if (!aWindow->GetContextInternal() || !aWindow->FastGetGlobalJSObject()) {
// This window was already closed, or never properly initialized,
// don't let a timer be scheduled on such a window.
aError.Throw(NS_ERROR_NOT_INITIALIZED);
return;
}
Init(aCx, std::move(aArguments));
}
nsJSScriptTimeoutHandler::nsJSScriptTimeoutHandler(JSContext* aCx,
nsGlobalWindowInner *aWindow,
const nsAString& aExpression,
bool* aAllowEval,
ErrorResult& aError)
: mLineNo(0)
, mColumn(0)
, mExpr(aExpression)
{
if (!aWindow->GetContextInternal() || !aWindow->FastGetGlobalJSObject()) {
// This window was already closed, or never properly initialized,
// don't let a timer be scheduled on such a window.
aError.Throw(NS_ERROR_NOT_INITIALIZED);
return;
}
*aAllowEval = CheckCSPForEval(aCx, aWindow, aExpression, aError);
if (aError.Failed() || !*aAllowEval) {
return;
}
Init(aCx);
}
nsJSScriptTimeoutHandler::nsJSScriptTimeoutHandler(JSContext* aCx,
WorkerPrivate* aWorkerPrivate,
Function& aFunction,
nsTArray<JS::Heap<JS::Value>>&& aArguments)
: mLineNo(0)
, mColumn(0)
, mFunction(&aFunction)
{
MOZ_ASSERT(aWorkerPrivate);
aWorkerPrivate->AssertIsOnWorkerThread();
Init(aCx, std::move(aArguments));
}
nsJSScriptTimeoutHandler::nsJSScriptTimeoutHandler(JSContext* aCx,
WorkerPrivate* aWorkerPrivate,
const nsAString& aExpression)
: mLineNo(0)
, mColumn(0)
, mExpr(aExpression)
{
MOZ_ASSERT(aWorkerPrivate);
aWorkerPrivate->AssertIsOnWorkerThread();
Init(aCx);
}
nsJSScriptTimeoutHandler::~nsJSScriptTimeoutHandler()
{
ReleaseJSObjects();
}
void
nsJSScriptTimeoutHandler::Init(JSContext* aCx,
nsTArray<JS::Heap<JS::Value>>&& aArguments)
{
mozilla::HoldJSObjects(this);
mArgs = std::move(aArguments);
Init(aCx);
}
void
nsJSScriptTimeoutHandler::Init(JSContext* aCx)
{
// Get the calling location.
nsJSUtils::GetCallingLocation(aCx, mFileName, &mLineNo, &mColumn);
}
void
nsJSScriptTimeoutHandler::ReleaseJSObjects()
{
if (mFunction) {
mFunction = nullptr;
mArgs.Clear();
mozilla::DropJSObjects(this);
}
}
const nsAString&
nsJSScriptTimeoutHandler::GetHandlerText()
{
NS_ASSERTION(!mFunction, "No expression, so no handler text!");
return mExpr;
}
already_AddRefed<nsIScriptTimeoutHandler>
NS_CreateJSTimeoutHandler(JSContext *aCx, nsGlobalWindowInner *aWindow,
Function& aFunction,
const Sequence<JS::Value>& aArguments,
ErrorResult& aError)
{
nsTArray<JS::Heap<JS::Value>> args;
if (!args.AppendElements(aArguments, fallible)) {
aError.Throw(NS_ERROR_OUT_OF_MEMORY);
return nullptr;
}
RefPtr<nsJSScriptTimeoutHandler> handler =
new nsJSScriptTimeoutHandler(aCx, aWindow, aFunction, std::move(args), aError);
return aError.Failed() ? nullptr : handler.forget();
}
already_AddRefed<nsIScriptTimeoutHandler>
NS_CreateJSTimeoutHandler(JSContext* aCx, nsGlobalWindowInner *aWindow,
const nsAString& aExpression, ErrorResult& aError)
{
bool allowEval = false;
RefPtr<nsJSScriptTimeoutHandler> handler =
new nsJSScriptTimeoutHandler(aCx, aWindow, aExpression, &allowEval, aError);
if (aError.Failed() || !allowEval) {
return nullptr;
}
return handler.forget();
}
already_AddRefed<nsIScriptTimeoutHandler>
NS_CreateJSTimeoutHandler(JSContext *aCx, WorkerPrivate* aWorkerPrivate,
Function& aFunction,
const Sequence<JS::Value>& aArguments,
ErrorResult& aError)
{
nsTArray<JS::Heap<JS::Value>> args;
if (!args.AppendElements(aArguments, fallible)) {
aError.Throw(NS_ERROR_OUT_OF_MEMORY);
return nullptr;
}
RefPtr<nsJSScriptTimeoutHandler> handler =
new nsJSScriptTimeoutHandler(aCx, aWorkerPrivate, aFunction, std::move(args));
return handler.forget();
}
already_AddRefed<nsIScriptTimeoutHandler>
NS_CreateJSTimeoutHandler(JSContext* aCx, WorkerPrivate* aWorkerPrivate,
const nsAString& aExpression)
{
RefPtr<nsJSScriptTimeoutHandler> handler =
new nsJSScriptTimeoutHandler(aCx, aWorkerPrivate, aExpression);
return handler.forget();
}