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src: refactor of CopyProperties with V8 5.5 DefineProperty #11102

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src: refactor of CopyProperties with V8 5.5 DefineProperty #11102

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5 changes: 5 additions & 0 deletions src/env.h
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Original file line number Diff line number Diff line change
Expand Up @@ -82,13 +82,15 @@ namespace node {
V(oncertcb_string, "oncertcb") \
V(onclose_string, "_onclose") \
V(code_string, "code") \
V(configurable_string, "configurable") \
V(cwd_string, "cwd") \
V(dest_string, "dest") \
V(detached_string, "detached") \
V(disposed_string, "_disposed") \
V(domain_string, "domain") \
V(emitting_top_level_domain_error_string, "_emittingTopLevelDomainError") \
V(exchange_string, "exchange") \
V(enumerable_string, "enumerable") \
V(idle_string, "idle") \
V(irq_string, "irq") \
V(encoding_string, "encoding") \
Expand All @@ -112,6 +114,7 @@ namespace node {
V(file_string, "file") \
V(fingerprint_string, "fingerprint") \
V(flags_string, "flags") \
V(get_string, "get") \
V(gid_string, "gid") \
V(handle_string, "handle") \
V(heap_total_string, "heapTotal") \
Expand Down Expand Up @@ -191,6 +194,7 @@ namespace node {
V(service_string, "service") \
V(servername_string, "servername") \
V(session_id_string, "sessionId") \
V(set_string, "set") \
V(shell_string, "shell") \
V(signal_string, "signal") \
V(size_string, "size") \
Expand All @@ -217,6 +221,7 @@ namespace node {
V(username_string, "username") \
V(valid_from_string, "valid_from") \
V(valid_to_string, "valid_to") \
V(value_string, "value") \
V(verify_error_string, "verifyError") \
V(version_string, "version") \
V(weight_string, "weight") \
Expand Down
73 changes: 41 additions & 32 deletions src/node_contextify.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,7 @@ using v8::ObjectTemplate;
using v8::Persistent;
using v8::PropertyAttribute;
using v8::PropertyCallbackInfo;
using v8::PropertyDescriptor;
using v8::Script;
using v8::ScriptCompiler;
using v8::ScriptOrigin;
Expand Down Expand Up @@ -132,41 +133,49 @@ class ContextifyContext {
return;

if (!has.FromJust()) {
// Could also do this like so:
//
// PropertyAttribute att = global->GetPropertyAttributes(key_v);
// Local<Value> val = global->Get(key_v);
// sandbox->ForceSet(key_v, val, att);
//
// However, this doesn't handle ES6-style properties configured with
// Object.defineProperty, and that's exactly what we're up against at
// this point. ForceSet(key,val,att) only supports value properties
// with the ES3-style attribute flags (DontDelete/DontEnum/ReadOnly),
// which doesn't faithfully capture the full range of configurations
// that can be done using Object.defineProperty.
if (clone_property_method.IsEmpty()) {
Local<String> code = FIXED_ONE_BYTE_STRING(env()->isolate(),
"(function cloneProperty(source, key, target) {\n"
" if (key === 'Proxy') return;\n"
" try {\n"
" var desc = Object.getOwnPropertyDescriptor(source, key);\n"
" if (desc.value === source) desc.value = target;\n"
" Object.defineProperty(target, key, desc);\n"
" } catch (e) {\n"
" // Catch sealed properties errors\n"
" }\n"
"})");

Local<Script> script =
Script::Compile(context, code).ToLocalChecked();
clone_property_method = Local<Function>::Cast(script->Run());
CHECK(clone_property_method->IsFunction());
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());
sandbox_obj->DefineProperty(context, key, *desc);
};
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We normally indent code inside lambdas with two spaces, like regular functions. However, if the linter doesn't complain, I guess I shouldn't either.


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);
}
Local<Value> args[] = { global, key, sandbox_obj };
clone_property_method->Call(global, arraysize(args), args);
}
}
}
}


// This is an object that just keeps an internal pointer to this
Expand Down