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node_contextify.cc
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1030 lines (834 loc) · 33.6 KB
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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
#include "node.h"
#include "node_internals.h"
#include "node_watchdog.h"
#include "base-object.h"
#include "base-object-inl.h"
#include "env.h"
#include "env-inl.h"
#include "util.h"
#include "util-inl.h"
#include "v8-debug.h"
namespace node {
using v8::Array;
using v8::ArrayBuffer;
using v8::Boolean;
using v8::Context;
using v8::Debug;
using v8::EscapableHandleScope;
using v8::External;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::HandleScope;
using v8::Integer;
using v8::Just;
using v8::Local;
using v8::Maybe;
using v8::MaybeLocal;
using v8::Name;
using v8::NamedPropertyHandlerConfiguration;
using v8::Nothing;
using v8::Object;
using v8::ObjectTemplate;
using v8::Persistent;
using v8::PropertyAttribute;
using v8::PropertyCallbackInfo;
using v8::PropertyDescriptor;
using v8::Script;
using v8::ScriptCompiler;
using v8::ScriptOrigin;
using v8::String;
using v8::TryCatch;
using v8::Uint8Array;
using v8::UnboundScript;
using v8::Value;
using v8::WeakCallbackInfo;
namespace {
class ContextifyContext {
protected:
// V8 reserves the first field in context objects for the debugger. We use the
// second field to hold a reference to the sandbox object.
enum { kSandboxObjectIndex = 1 };
Environment* const env_;
Persistent<Context> context_;
public:
ContextifyContext(Environment* env, Local<Object> sandbox_obj) : env_(env) {
Local<Context> v8_context = CreateV8Context(env, sandbox_obj);
context_.Reset(env->isolate(), v8_context);
// Allocation failure or maximum call stack size reached
if (context_.IsEmpty())
return;
context_.SetWeak(this, WeakCallback, v8::WeakCallbackType::kParameter);
context_.MarkIndependent();
}
~ContextifyContext() {
context_.Reset();
}
inline Environment* env() const {
return env_;
}
inline Local<Context> context() const {
return PersistentToLocal(env()->isolate(), context_);
}
inline Local<Object> global_proxy() const {
return context()->Global();
}
inline Local<Object> sandbox() const {
return Local<Object>::Cast(context()->GetEmbedderData(kSandboxObjectIndex));
}
// XXX(isaacs): This function only exists because of a shortcoming of
// the V8 SetNamedPropertyHandler function.
//
// It does not provide a way to intercept Object.defineProperty(..)
// calls. As a result, these properties are not copied onto the
// contextified sandbox when a new global property is added via either
// a function declaration or a Object.defineProperty(global, ...) call.
//
// Note that any function declarations or Object.defineProperty()
// globals that are created asynchronously (in a setTimeout, callback,
// etc.) will happen AFTER the call to copy properties, and thus not be
// caught.
//
// The way to properly fix this is to add some sort of a
// Object::SetNamedDefinePropertyHandler() function that takes a callback,
// which receives the property name and property descriptor as arguments.
//
// Luckily, such situations are rare, and asynchronously-added globals
// weren't supported by Node's VM module until 0.12 anyway. But, this
// should be fixed properly in V8, and this copy function should be
// removed once there is a better way.
void CopyProperties() {
HandleScope scope(env()->isolate());
Local<Context> context = PersistentToLocal(env()->isolate(), context_);
Local<Object> global =
context->Global()->GetPrototype()->ToObject(env()->isolate());
Local<Object> sandbox_obj = sandbox();
Local<Function> clone_property_method;
Local<Array> names = global->GetOwnPropertyNames();
int length = names->Length();
for (int i = 0; i < length; i++) {
Local<String> key = names->Get(i)->ToString(env()->isolate());
Maybe<bool> has = sandbox_obj->HasOwnProperty(context, key);
// Check for pending exceptions
if (has.IsNothing())
return;
if (!has.FromJust()) {
Local<Object> desc_vm_context =
global->GetOwnPropertyDescriptor(context, key)
.ToLocalChecked().As<Object>();
bool is_accessor =
desc_vm_context->Has(context, env()->get_string()).FromJust() ||
desc_vm_context->Has(context, env()->set_string()).FromJust();
auto define_property_on_sandbox = [&] (PropertyDescriptor* desc) {
desc->set_configurable(desc_vm_context
->Get(context, env()->configurable_string()).ToLocalChecked()
->BooleanValue(context).FromJust());
desc->set_enumerable(desc_vm_context
->Get(context, env()->enumerable_string()).ToLocalChecked()
->BooleanValue(context).FromJust());
CHECK(sandbox_obj->DefineProperty(context, key, *desc).FromJust());
};
if (is_accessor) {
Local<Function> get =
desc_vm_context->Get(context, env()->get_string())
.ToLocalChecked().As<Function>();
Local<Function> set =
desc_vm_context->Get(context, env()->set_string())
.ToLocalChecked().As<Function>();
PropertyDescriptor desc(get, set);
define_property_on_sandbox(&desc);
} else {
Local<Value> value =
desc_vm_context->Get(context, env()->value_string())
.ToLocalChecked();
bool writable =
desc_vm_context->Get(context, env()->writable_string())
.ToLocalChecked()->BooleanValue(context).FromJust();
PropertyDescriptor desc(value, writable);
define_property_on_sandbox(&desc);
}
}
}
}
// This is an object that just keeps an internal pointer to this
// ContextifyContext. It's passed to the NamedPropertyHandler. If we
// pass the main JavaScript context object we're embedded in, then the
// NamedPropertyHandler will store a reference to it forever and keep it
// from getting gc'd.
Local<Value> CreateDataWrapper(Environment* env) {
EscapableHandleScope scope(env->isolate());
Local<Object> wrapper =
env->script_data_constructor_function()
->NewInstance(env->context()).FromMaybe(Local<Object>());
if (wrapper.IsEmpty())
return scope.Escape(Local<Value>::New(env->isolate(), Local<Value>()));
Wrap(wrapper, this);
return scope.Escape(wrapper);
}
Local<Context> CreateV8Context(Environment* env, Local<Object> sandbox_obj) {
EscapableHandleScope scope(env->isolate());
Local<FunctionTemplate> function_template =
FunctionTemplate::New(env->isolate());
function_template->SetHiddenPrototype(true);
function_template->SetClassName(sandbox_obj->GetConstructorName());
Local<ObjectTemplate> object_template =
function_template->InstanceTemplate();
NamedPropertyHandlerConfiguration config(GlobalPropertyGetterCallback,
GlobalPropertySetterCallback,
GlobalPropertyQueryCallback,
GlobalPropertyDeleterCallback,
GlobalPropertyEnumeratorCallback,
CreateDataWrapper(env));
object_template->SetHandler(config);
Local<Context> ctx = Context::New(env->isolate(), nullptr, object_template);
if (ctx.IsEmpty()) {
env->ThrowError("Could not instantiate context");
return Local<Context>();
}
ctx->SetSecurityToken(env->context()->GetSecurityToken());
// We need to tie the lifetime of the sandbox object with the lifetime of
// newly created context. We do this by making them hold references to each
// other. The context can directly hold a reference to the sandbox as an
// embedder data field. However, we cannot hold a reference to a v8::Context
// directly in an Object, we instead hold onto the new context's global
// object instead (which then has a reference to the context).
ctx->SetEmbedderData(kSandboxObjectIndex, sandbox_obj);
sandbox_obj->SetPrivate(env->context(),
env->contextify_global_private_symbol(),
ctx->Global());
env->AssignToContext(ctx);
return scope.Escape(ctx);
}
static void Init(Environment* env, Local<Object> target) {
Local<FunctionTemplate> function_template =
FunctionTemplate::New(env->isolate());
function_template->InstanceTemplate()->SetInternalFieldCount(1);
env->set_script_data_constructor_function(function_template->GetFunction());
env->SetMethod(target, "runInDebugContext", RunInDebugContext);
env->SetMethod(target, "makeContext", MakeContext);
env->SetMethod(target, "isContext", IsContext);
}
static void RunInDebugContext(const FunctionCallbackInfo<Value>& args) {
Local<String> script_source(args[0]->ToString(args.GetIsolate()));
if (script_source.IsEmpty())
return; // Exception pending.
Local<Context> debug_context = Debug::GetDebugContext(args.GetIsolate());
Environment* env = Environment::GetCurrent(args);
if (debug_context.IsEmpty()) {
// Force-load the debug context.
auto dummy_event_listener = [] (const Debug::EventDetails&) {};
Debug::SetDebugEventListener(args.GetIsolate(), dummy_event_listener);
debug_context = Debug::GetDebugContext(args.GetIsolate());
CHECK(!debug_context.IsEmpty());
// Ensure that the debug context has an Environment assigned in case
// a fatal error is raised. The fatal exception handler in node.cc
// is not equipped to deal with contexts that don't have one and
// can't easily be taught that due to a deficiency in the V8 API:
// there is no way for the embedder to tell if the data index is
// in use.
const int index = Environment::kContextEmbedderDataIndex;
debug_context->SetAlignedPointerInEmbedderData(index, env);
}
Context::Scope context_scope(debug_context);
MaybeLocal<Script> script = Script::Compile(debug_context, script_source);
if (script.IsEmpty())
return; // Exception pending.
args.GetReturnValue().Set(script.ToLocalChecked()->Run());
}
static void MakeContext(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (!args[0]->IsObject()) {
return env->ThrowTypeError("sandbox argument must be an object.");
}
Local<Object> sandbox = args[0].As<Object>();
// Don't allow contextifying a sandbox multiple times.
CHECK(
!sandbox->HasPrivate(
env->context(),
env->contextify_context_private_symbol()).FromJust());
TryCatch try_catch(env->isolate());
ContextifyContext* context = new ContextifyContext(env, sandbox);
if (try_catch.HasCaught()) {
try_catch.ReThrow();
return;
}
if (context->context().IsEmpty())
return;
sandbox->SetPrivate(
env->context(),
env->contextify_context_private_symbol(),
External::New(env->isolate(), context));
}
static void IsContext(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (!args[0]->IsObject()) {
env->ThrowTypeError("sandbox must be an object");
return;
}
Local<Object> sandbox = args[0].As<Object>();
Maybe<bool> result =
sandbox->HasPrivate(env->context(),
env->contextify_context_private_symbol());
args.GetReturnValue().Set(result.FromJust());
}
static void WeakCallback(const WeakCallbackInfo<ContextifyContext>& data) {
ContextifyContext* context = data.GetParameter();
delete context;
}
static ContextifyContext* ContextFromContextifiedSandbox(
Environment* env,
const Local<Object>& sandbox) {
MaybeLocal<Value> maybe_value =
sandbox->GetPrivate(env->context(),
env->contextify_context_private_symbol());
Local<Value> context_external_v;
if (maybe_value.ToLocal(&context_external_v) &&
context_external_v->IsExternal()) {
Local<External> context_external = context_external_v.As<External>();
return static_cast<ContextifyContext*>(context_external->Value());
}
return nullptr;
}
static void GlobalPropertyGetterCallback(
Local<Name> property,
const PropertyCallbackInfo<Value>& args) {
ContextifyContext* ctx;
ASSIGN_OR_RETURN_UNWRAP(&ctx, args.Data().As<Object>());
// Still initializing
if (ctx->context_.IsEmpty())
return;
Local<Context> context = ctx->context();
Local<Object> sandbox = ctx->sandbox();
MaybeLocal<Value> maybe_rv =
sandbox->GetRealNamedProperty(context, property);
if (maybe_rv.IsEmpty()) {
maybe_rv =
ctx->global_proxy()->GetRealNamedProperty(context, property);
}
Local<Value> rv;
if (maybe_rv.ToLocal(&rv)) {
if (rv == sandbox)
rv = ctx->global_proxy();
args.GetReturnValue().Set(rv);
}
}
static void GlobalPropertySetterCallback(
Local<Name> property,
Local<Value> value,
const PropertyCallbackInfo<Value>& args) {
ContextifyContext* ctx;
ASSIGN_OR_RETURN_UNWRAP(&ctx, args.Data().As<Object>());
// Still initializing
if (ctx->context_.IsEmpty())
return;
auto attributes = PropertyAttribute::None;
bool is_declared =
ctx->global_proxy()->GetRealNamedPropertyAttributes(ctx->context(),
property)
.To(&attributes);
bool read_only =
static_cast<int>(attributes) &
static_cast<int>(PropertyAttribute::ReadOnly);
if (is_declared && read_only)
return;
// true for x = 5
// false for this.x = 5
// false for Object.defineProperty(this, 'foo', ...)
// false for vmResult.x = 5 where vmResult = vm.runInContext();
bool is_contextual_store = ctx->global_proxy() != args.This();
// Indicator to not return before setting (undeclared) function declarations
// on the sandbox in strict mode, i.e. args.ShouldThrowOnError() = true.
// True for 'function f() {}', 'this.f = function() {}',
// 'var f = function()'.
// In effect only for 'function f() {}' because
// var f = function(), is_declared = true
// this.f = function() {}, is_contextual_store = false.
bool is_function = value->IsFunction();
if (!is_declared && args.ShouldThrowOnError() && is_contextual_store &&
!is_function)
return;
ctx->sandbox()->Set(property, value);
}
static void GlobalPropertyQueryCallback(
Local<Name> property,
const PropertyCallbackInfo<Integer>& args) {
ContextifyContext* ctx;
ASSIGN_OR_RETURN_UNWRAP(&ctx, args.Data().As<Object>());
// Still initializing
if (ctx->context_.IsEmpty())
return;
Local<Context> context = ctx->context();
Maybe<PropertyAttribute> maybe_prop_attr =
ctx->sandbox()->GetRealNamedPropertyAttributes(context, property);
if (maybe_prop_attr.IsNothing()) {
maybe_prop_attr =
ctx->global_proxy()->GetRealNamedPropertyAttributes(context,
property);
}
if (maybe_prop_attr.IsJust()) {
PropertyAttribute prop_attr = maybe_prop_attr.FromJust();
args.GetReturnValue().Set(prop_attr);
}
}
static void GlobalPropertyDeleterCallback(
Local<Name> property,
const PropertyCallbackInfo<Boolean>& args) {
ContextifyContext* ctx;
ASSIGN_OR_RETURN_UNWRAP(&ctx, args.Data().As<Object>());
// Still initializing
if (ctx->context_.IsEmpty())
return;
Maybe<bool> success = ctx->sandbox()->Delete(ctx->context(), property);
if (success.FromMaybe(false))
return;
// Delete failed on the sandbox, intercept and do not delete on
// the global object.
args.GetReturnValue().Set(false);
}
static void GlobalPropertyEnumeratorCallback(
const PropertyCallbackInfo<Array>& args) {
ContextifyContext* ctx;
ASSIGN_OR_RETURN_UNWRAP(&ctx, args.Data().As<Object>());
// Still initializing
if (ctx->context_.IsEmpty())
return;
args.GetReturnValue().Set(ctx->sandbox()->GetPropertyNames());
}
};
class ContextifyScript : public BaseObject {
private:
Persistent<UnboundScript> script_;
public:
static void Init(Environment* env, Local<Object> target) {
HandleScope scope(env->isolate());
Local<String> class_name =
FIXED_ONE_BYTE_STRING(env->isolate(), "ContextifyScript");
Local<FunctionTemplate> script_tmpl = env->NewFunctionTemplate(New);
script_tmpl->InstanceTemplate()->SetInternalFieldCount(1);
script_tmpl->SetClassName(class_name);
env->SetProtoMethod(script_tmpl, "runInContext", RunInContext);
env->SetProtoMethod(script_tmpl, "runInThisContext", RunInThisContext);
target->Set(class_name, script_tmpl->GetFunction());
env->set_script_context_constructor_template(script_tmpl);
}
// args: code, [options]
static void New(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (!args.IsConstructCall()) {
return env->ThrowError("Must call vm.Script as a constructor.");
}
ContextifyScript* contextify_script =
new ContextifyScript(env, args.This());
TryCatch try_catch(env->isolate());
Local<String> code = args[0]-&
BE96
gt;ToString(env->isolate());
Local<Value> options = args[1];
MaybeLocal<String> filename = GetFilenameArg(env, options);
MaybeLocal<Integer> lineOffset = GetLineOffsetArg(env, options);
MaybeLocal<Integer> columnOffset = GetColumnOffsetArg(env, options);
Maybe<bool> maybe_display_errors = GetDisplayErrorsArg(env, options);
MaybeLocal<Uint8Array> cached_data_buf = GetCachedData(env, options);
Maybe<bool> maybe_produce_cached_data = GetProduceCachedData(env, options);
if (try_catch.HasCaught()) {
try_catch.ReThrow();
return;
}
bool display_errors = maybe_display_errors.ToChecked();
bool produce_cached_data = maybe_produce_cached_data.ToChecked();
ScriptCompiler::CachedData* cached_data = nullptr;
Local<Uint8Array> ui8;
if (cached_data_buf.ToLocal(&ui8)) {
ArrayBuffer::Contents contents = ui8->Buffer()->GetContents();
cached_data = new ScriptCompiler::CachedData(
static_cast<uint8_t*>(contents.Data()) + ui8->ByteOffset(),
ui8->ByteLength());
}
ScriptOrigin origin(filename.ToLocalChecked(), lineOffset.ToLocalChecked(),
columnOffset.ToLocalChecked());
ScriptCompiler::Source source(code, origin, cached_data);
ScriptCompiler::CompileOptions compile_options =
ScriptCompiler::kNoCompileOptions;
if (source.GetCachedData() != nullptr)
compile_options = ScriptCompiler::kConsumeCodeCache;
else if (produce_cached_data)
compile_options = ScriptCompiler::kProduceCodeCache;
MaybeLocal<UnboundScript> v8_script = ScriptCompiler::CompileUnboundScript(
env->isolate(),
&source,
compile_options);
if (v8_script.IsEmpty()) {
if (display_errors) {
DecorateErrorStack(env, try_catch);
}
try_catch.ReThrow();
return;
}
contextify_script->script_.Reset(env->isolate(),
v8_script.ToLocalChecked());
if (compile_options == ScriptCompiler::kConsumeCodeCache) {
args.This()->Set(
env->cached_data_rejected_string(),
Boolean::New(env->isolate(), source.GetCachedData()->rejected));
} else if (compile_options == ScriptCompiler::kProduceCodeCache) {
const ScriptCompiler::CachedData* cached_data = source.GetCachedData();
bool cached_data_produced = cached_data != nullptr;
if (cached_data_produced) {
MaybeLocal<Object> buf = Buffer::Copy(
env,
reinterpret_cast<const char*>(cached_data->data),
cached_data->length);
args.This()->Set(env->cached_data_string(), buf.ToLocalChecked());
}
args.This()->Set(
env->cached_data_produced_string(),
Boolean::New(env->isolate(), cached_data_produced));
}
}
static bool InstanceOf(Environment* env, const Local<Value>& value) {
return !value.IsEmpty() &&
env->script_context_constructor_template()->HasInstance(value);
}
// args: [options]
static void RunInThisContext(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
// Assemble arguments
TryCatch try_catch(args.GetIsolate());
Maybe<int64_t> maybe_timeout = GetTimeoutArg(env, args[0]);
Maybe<bool> maybe_display_errors = GetDisplayErrorsArg(env, args[0]);
Maybe<bool> maybe_break_on_sigint = GetBreakOnSigintArg(env, args[0]);
if (try_catch.HasCaught()) {
try_catch.ReThrow();
return;
}
int64_t timeout = maybe_timeout.ToChecked();
bool display_errors = maybe_display_errors.ToChecked();
bool break_on_sigint = maybe_break_on_sigint.ToChecked();
// Do the eval within this context
EvalMachine(env, timeout, display_errors, break_on_sigint, args,
&try_catch);
}
// args: sandbox, [options]
static void RunInContext(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
int64_t timeout;
bool display_errors;
bool break_on_sigint;
// Assemble arguments
if (!args[0]->IsObject()) {
return env->ThrowTypeError(
"contextifiedSandbox argument must be an object.");
}
Local<Object> sandbox = args[0].As<Object>();
{
TryCatch try_catch(env->isolate());
Maybe<int64_t> maybe_timeout = GetTimeoutArg(env, args[1]);
Maybe<bool> maybe_display_errors = GetDisplayErrorsArg(env, args[1]);
Maybe<bool> maybe_break_on_sigint = GetBreakOnSigintArg(env, args[1]);
if (try_catch.HasCaught()) {
try_catch.ReThrow();
return;
}
timeout = maybe_timeout.ToChecked();
display_errors = maybe_display_errors.ToChecked();
break_on_sigint = maybe_break_on_sigint.ToChecked();
}
// Get the context from the sandbox
ContextifyContext* contextify_context =
ContextifyContext::ContextFromContextifiedSandbox(env, sandbox);
if (contextify_context == nullptr) {
return env->ThrowTypeError(
"sandbox argument must have been converted to a context.");
}
if (contextify_context->context().IsEmpty())
return;
{
TryCatch try_catch(env->isolate());
// Do the eval within the context
Context::Scope context_scope(contextify_context->context());
if (EvalMachine(contextify_context->env(),
timeout,
display_errors,
break_on_sigint,
args,
&try_catch)) {
contextify_context->CopyProperties();
}
if (try_catch.HasCaught()) {
try_catch.ReThrow();
return;
}
}
}
static void DecorateErrorStack(Environment* env, const TryCatch& try_catch) {
Local<Value> exception = try_catch.Exception();
if (!exception->IsObject())
return;
Local<Object> err_obj = exception.As<Object>();
if (IsExceptionDecorated(env, err_obj))
return;
AppendExceptionLine(env, exception, try_catch.Message(), CONTEXTIFY_ERROR);
Local<Value> stack = err_obj->Get(env->stack_string());
MaybeLocal<Value> maybe_value =
err_obj->GetPrivate(
env->context(),
env->arrow_message_private_symbol());
Local<Value> arrow;
if (!(maybe_value.ToLocal(&arrow) && arrow->IsString())) {
return;
}
if (stack.IsEmpty() || !stack->IsString()) {
return;
}
Local<String> decorated_stack = String::Concat(
String::Concat(arrow.As<String>(),
FIXED_ONE_BYTE_STRING(env->isolate(), "\n")),
stack.As<String>());
err_obj->Set(env->stack_string(), decorated_stack);
err_obj->SetPrivate(
env->context(),
env->decorated_private_symbol(),
True(env->isolate()));
}
static Maybe<bool> GetBreakOnSigintArg(Environment* env,
Local<Value> options) {
if (options->IsUndefined() || options->IsString()) {
return Just(false);
}
if (!options->IsObject()) {
env->ThrowTypeError("options must be an object");
return Nothing<bool>();
}
Local<String> key = FIXED_ONE_BYTE_STRING(env->isolate(), "breakOnSigint");
MaybeLocal<Value> maybe_value =
options.As<Object>()->Get(env->context(), key);
if (maybe_value.IsEmpty())
return Nothing<bool>();
Local<Value> value = maybe_value.ToLocalChecked();
return Just(value->IsTrue());
}
static Maybe<int64_t> GetTimeoutArg(Environment* env, Local<Value> options) {
if (options->IsUndefined() || options->IsString()) {
return Just<int64_t>(-1);
}
if (!options->IsObject()) {
env->ThrowTypeError("options must be an object");
return Nothing<int64_t>();
}
MaybeLocal<Value> maybe_value =
options.As<Object>()->Get(env->context(), env->timeout_string());
if (maybe_value.IsEmpty())
return Nothing<int64_t>();
Local<Value> value = maybe_value.ToLocalChecked();
if (value->IsUndefined()) {
return Just<int64_t>(-1);
}
Maybe<int64_t> timeout = value->IntegerValue(env->context());
if (timeout.IsJust() && timeout.ToChecked() <= 0) {
env->ThrowRangeError("timeout must be a positive number");
return Nothing<int64_t>();
}
return timeout;
}
static Maybe<bool> GetDisplayErrorsArg(Environment* env,
Local<Value> options) {
if (options->IsUndefined() || options->IsString()) {
return Just(true);
}
if (!options->IsObject()) {
env->ThrowTypeError("options must be an object");
return Nothing<bool>();
}
Local<String> key = FIXED_ONE_BYTE_STRING(env->isolate(), "displayErrors");
MaybeLocal<Value> maybe_value =
options.As<Object>()->Get(env->context(), key);
if (maybe_value.IsEmpty())
return Nothing<bool>();
Local<Value> value = maybe_value.ToLocalChecked();
if (value->IsUndefined())
return Just(true);
return value->BooleanValue(env->context());
}
static MaybeLocal<String> GetFilenameArg(Environment* env,
Local<Value> options) {
Local<String> defaultFilename =
FIXED_ONE_BYTE_STRING(env->isolate(), "evalmachine.<anonymous>");
if (options->IsUndefined()) {
return defaultFilename;
}
if (options->IsString()) {
return options.As<String>();
}
if (!options->IsObject()) {
env->ThrowTypeError("options must be an object");
return Local<String>();
}
Local<String> key = FIXED_ONE_BYTE_STRING(env->isolate(), "filename");
MaybeLocal<Value> maybe_value =
options.As<Object>()->Get(env->context(), key);
if (maybe_value.IsEmpty())
return MaybeLocal<String>();
Local<Value> value = maybe_value.ToLocalChecked();
if (value->IsUndefined())
return defaultFilename;
return value->ToString(env->context());
}
static MaybeLocal<Uint8Array> GetCachedData(Environment* env,
Local<Value> options) {
if (!options->IsObject()) {
return MaybeLocal<Uint8Array>();
}
MaybeLocal<Value> maybe_value =
options.As<Object>()->Get(env->context(), env->cached_data_string());
if (maybe_value.IsEmpty())
return MaybeLocal<Uint8Array>();
Local<Value> value = maybe_value.ToLocalChecked();
if (value->IsUndefined()) {
return MaybeLocal<Uint8Array>();
}
if (!value->IsUint8Array()) {
env->ThrowTypeError("options.cachedData must be a Buffer instance");
return MaybeLocal<Uint8Array>();
}
return value.As<Uint8Array>();
}
static Maybe<bool> GetProduceCachedData(Environment* env,
Local<Value> options) {
if (!options->IsObject()) {
return Just(false);
}
MaybeLocal<Value> maybe_value =
options.As<Object>()->Get(env->context(),
env->produce_cached_data_string());
if (maybe_value.IsEmpty())
return Nothing<bool>();
Local<Value> value = maybe_value.ToLocalChecked();
return Just(value->IsTrue());
}
static MaybeLocal<Integer> GetLineOffsetArg(Environment* env,
Local<Value> options) {
Local<Integer> defaultLineOffset = Integer::New(env->isolate(), 0);
if (!options->IsObject()) {
return defaultLineOffset;
}
Local<String> key = FIXED_ONE_BYTE_STRING(env->isolate(), "lineOffset");
MaybeLocal<Value> maybe_value =
options.As<Object>()->Get(env->context(), key);
if (maybe_value.IsEmpty())
return MaybeLocal<Integer>();
Local<Value> value = maybe_value.ToLocalChecked();
if (value->IsUndefined())
return defaultLineOffset;
return value->ToInteger(env->context());
}
static MaybeLocal<Integer> GetColumnOffsetArg(Environment* env,
Local<Value> options) {
Local<Integer> defaultColumnOffset = Integer::New(env->isolate(), 0);
if (!options->IsObject()) {
return defaultColumnOffset;
}
Local<String> key = FIXED_ONE_BYTE_STRING(env->isolate(), "columnOffset");
MaybeLocal<Value> maybe_value =
options.As<Object>()->Get(env->context(), key);
if (maybe_value.IsEmpty())
return MaybeLocal<Integer>();
Local<Value> value = maybe_value.ToLocalChecked();
if (value->IsUndefined())
return defaultColumnOffset;
return value->ToInteger(env->context());
}
static bool EvalMachine(Environment* env,
const int64_t timeout,
const bool display_errors,
const bool break_on_sigint,
const FunctionCallbackInfo<Value>& args,
TryCatch* try_catch) {
if (!ContextifyScript::InstanceOf(env, args.Holder())) {
env->ThrowTypeError(
"Script methods can only be called on script instances.");
return false;
}
ContextifyScript* wrapped_script;
ASSIGN_OR_RETURN_UNWRAP(&wrapped_script, args.Holder(), false);
Local<UnboundScript> unbound_script =
PersistentToLocal(env->isolate(), wrapped_script->script_);
Local<Script> script = unbound_script->BindToCurrentContext();
Local<Value> result;
bool timed_out = false;
bool received_signal = false;
if (break_on_sigint && timeout != -1) {
Watchdog wd(env->isolate(), timeout, &timed_out);
SigintWatchdog swd(env->isolate(), &received_signal);
result = script->Run();
} else if (break_on_sigint) {
SigintWatchdog swd(env->isolate(), &received_signal);
result = script->Run();
} else if (timeout != -1) {
Watchdog wd(env->isolate(), timeout, &timed_out);
result = script->Run();
} else {
result = script->Run();
}
if (timed_out || received_signal) {
// It is possible that execution was terminated by another timeout in
// which this timeout is nested, so check whether one of the watchdogs
// from this invocation is responsible for termination.
if (timed_out) {
env->ThrowError("Script execution timed out.");
} else if (received_signal) {
env->ThrowError("Script execution interrupted.");
}
env->isolate()->CancelTerminateExecution();
}
if (try_catch->HasCaught()) {
if (!timed_out && !received_signal && display_errors) {
// We should decorate non-termination exceptions
DecorateErrorStack(env, *try_catch);
}
// If there was an exception thrown during script execution, re-throw it.
// If one of the above checks threw, re-throw the exception instead of
// letting try_catch catch it.
// If execution has been terminated, but not by one of the watchdogs from
// this invocation, this will re-throw a `null` value.
try_catch->ReThrow();
return false;
}