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// Copyright 2016 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "fxjs/xfa/cfxjse_context.h"
#include <utility>
#include "fxjs/cfxjs_engine.h"
#include "fxjs/fxv8.h"
#include "fxjs/xfa/cfxjse_class.h"
#include "fxjs/xfa/cfxjse_isolatetracker.h"
#include "fxjs/xfa/cfxjse_runtimedata.h"
#include "fxjs/xfa/cfxjse_value.h"
#include "fxjs/xfa/cjx_object.h"
#include "third_party/base/check.h"
#include "third_party/base/ptr_util.h"
#include "xfa/fxfa/parser/cxfa_thisproxy.h"
namespace {
const char szCompatibleModeScript[] =
"(function(global, list) {\n"
" 'use strict';\n"
" var objname;\n"
" for (objname in list) {\n"
" var globalobj = global[objname];\n"
" if (globalobj) {\n"
" list[objname].forEach(function(name) {\n"
" if (!globalobj[name]) {\n"
" Object.defineProperty(globalobj, name, {\n"
" writable: true,\n"
" enumerable: false,\n"
" value: (function(obj) {\n"
" if (arguments.length === 0) {\n"
" throw new TypeError('missing argument 0 when calling "
" function ' + objname + '.' + name);\n"
" }\n"
" return globalobj.prototype[name].apply(obj, "
" Array.prototype.slice.call(arguments, 1));\n"
" })\n"
" });\n"
" }\n"
" });\n"
" }\n"
" }\n"
"}(this, {String: ['substr', 'toUpperCase']}));";
const char szConsoleScript[] =
"console.show = function() {};\n"
"\n"
"console.println = function(...args) {\n"
" this.log(...args);\n"
"};";
// Only address matters, values are for humans debuging here.
const char kFXJSEHostObjectTag[] = "FXJSE Host Object";
const char kFXJSEProxyObjectTag[] = "FXJSE Proxy Object";
v8::Local<v8::Object> CreateReturnValue(v8::Isolate* pIsolate,
v8::TryCatch* trycatch) {
v8::Local<v8::Object> hReturnValue = v8::Object::New(pIsolate);
if (!trycatch->HasCaught())
return hReturnValue;
v8::Local<v8::Message> hMessage = trycatch->Message();
if (hMessage.IsEmpty())
return hReturnValue;
v8::Local<v8::Context> context = pIsolate->GetCurrentContext();
v8::Local<v8::Value> hException = trycatch->Exception();
if (hException->IsObject()) {
v8::Local<v8::String> hNameStr = fxv8::NewStringHelper(pIsolate, "name");
v8::Local<v8::Value> hValue =
hException.As<v8::Object>()->Get(context, hNameStr).ToLocalChecked();
if (hValue->IsString() || hValue->IsStringObject()) {
hReturnValue->Set(context, 0, hValue).FromJust();
} else {
v8::Local<v8::String> hErrorStr =
fxv8::NewStringHelper(pIsolate, "Error");
hReturnValue->Set(context, 0, hErrorStr).FromJust();
}
v8::Local<v8::String> hMessageStr =
fxv8::NewStringHelper(pIsolate, "message");
hValue =
hException.As<v8::Object>()->Get(context, hMessageStr).ToLocalChecked();
if (hValue->IsString() || hValue->IsStringObject())
hReturnValue->Set(context, 1, hValue).FromJust();
else
hReturnValue->Set(context, 1, hMessage->Get()).FromJust();
} else {
v8::Local<v8::String> hErrorStr = fxv8::NewStringHelper(pIsolate, "Error");
hReturnValue->Set(context, 0, hErrorStr).FromJust();
hReturnValue->Set(context, 1, hMessage->Get()).FromJust();
}
hReturnValue->Set(context, 2, hException).FromJust();
int line = hMessage->GetLineNumber(context).FromMaybe(0);
hReturnValue->Set(context, 3, v8::Integer::New(pIsolate, line)).FromJust();
v8::Local<v8::String> source =
hMessage->GetSourceLine(context).FromMaybe(v8::Local<v8::String>());
hReturnValue->Set(context, 4, source).FromJust();
int column = hMessage->GetStartColumn(context).FromMaybe(0);
hReturnValue->Set(context, 5, v8::Integer::New(pIsolate, column)).FromJust();
column = hMessage->GetEndColumn(context).FromMaybe(0);
hReturnValue->Set(context, 6, v8::Integer::New(pIsolate, column)).FromJust();
return hReturnValue;
}
void FXJSE_UpdateProxyBinding(v8::Local<v8::Object> hObject) {
DCHECK(!hObject.IsEmpty());
DCHECK(hObject->InternalFieldCount() == 2);
hObject->SetAlignedPointerInInternalField(
0, const_cast<char*>(kFXJSEProxyObjectTag));
hObject->SetAlignedPointerInInternalField(1, nullptr);
}
} // namespace
void FXJSE_UpdateObjectBinding(v8::Local<v8::Object> hObject,
CFXJSE_HostObject* lpNewBinding) {
DCHECK(!hObject.IsEmpty());
DCHECK(hObject->InternalFieldCount() == 2);
hObject->SetAlignedPointerInInternalField(
0, const_cast<char*>(kFXJSEHostObjectTag));
hObject->SetAlignedPointerInInternalField(1, lpNewBinding);
}
void FXJSE_ClearObjectBinding(v8::Local<v8::Object> hObject) {
DCHECK(!hObject.IsEmpty());
DCHECK(hObject->InternalFieldCount() == 2);
hObject->SetAlignedPointerInInternalField(0, nullptr);
hObject->SetAlignedPointerInInternalField(1, nullptr);
}
CFXJSE_HostObject* FXJSE_RetrieveObjectBinding(v8::Local<v8::Value> hValue) {
if (!fxv8::IsObject(hValue))
return nullptr;
v8::Local<v8::Object> hObject = hValue.As<v8::Object>();
if (hObject->InternalFieldCount() != 2 ||
hObject->GetAlignedPointerFromInternalField(0) == kFXJSEProxyObjectTag) {
v8::Local<v8::Value> hProtoObject = hObject->GetPrototype();
if (!fxv8::IsObject(hProtoObject))
return nullptr;
hObject = hProtoObject.As<v8::Object>();
if (hObject->InternalFieldCount() != 2)
return nullptr;
}
if (hObject->GetAlignedPointerFromInternalField(0) != kFXJSEHostObjectTag)
return nullptr;
return static_cast<CFXJSE_HostObject*>(
hObject->GetAlignedPointerFromInternalField(1));
}
// static
std::unique_ptr<CFXJSE_Context> CFXJSE_Context::Create(
v8::Isolate* pIsolate,
const FXJSE_CLASS_DESCRIPTOR* pGlobalClass,
CFXJSE_HostObject* pGlobalObject,
CXFA_ThisProxy* pProxy) {
CFXJSE_ScopeUtil_IsolateHandle scope(pIsolate);
// Private constructor.
auto pContext = pdfium::WrapUnique(new CFXJSE_Context(pIsolate, pProxy));
v8::Local<v8::ObjectTemplate> hObjectTemplate;
if (pGlobalClass) {
CFXJSE_Class* pGlobalClassObj =
CFXJSE_Class::Create(pContext.get(), pGlobalClass, true);
hObjectTemplate =
pGlobalClassObj->GetTemplate(pIsolate)->InstanceTemplate();
} else {
hObjectTemplate = v8::ObjectTemplate::New(pIsolate);
hObjectTemplate->SetInternalFieldCount(2);
}
hObjectTemplate->Set(v8::Symbol::GetToStringTag(pIsolate),
fxv8::NewStringHelper(pIsolate, "global"));
v8::Local<v8::Context> hNewContext =
v8::Context::New(pIsolate, nullptr, hObjectTemplate);
v8::Local<v8::Object> pThisProxy = hNewContext->Global();
FXJSE_UpdateProxyBinding(pThisProxy);
v8::Local<v8::Object> pThis = pThisProxy->GetPrototype().As<v8::Object>();
FXJSE_UpdateObjectBinding(pThis, pGlobalObject);
v8::Local<v8::Context> hRootContext = v8::Local<v8::Context>::New(
pIsolate, CFXJSE_RuntimeData::Get(pIsolate)->m_hRootContext);
hNewContext->SetSecurityToken(hRootContext->GetSecurityToken());
pContext->m_hContext.Reset(pIsolate, hNewContext);
return pContext;
}
CFXJSE_Context::CFXJSE_Context(v8::Isolate* pIsolate, CXFA_ThisProxy* pProxy)
: m_pIsolate(pIsolate), m_pProxy(pProxy) {}
CFXJSE_Context::~CFXJSE_Context() = default;
v8::Local<v8::Object> CFXJSE_Context::GetGlobalObject() {
v8::Isolate::Scope isolate_scope(GetIsolate());
v8::EscapableHandleScope handle_scope(GetIsolate());
v8::Local<v8::Context> hContext =
v8::Local<v8::Context>::New(GetIsolate(), m_hContext);
v8::Local<v8::Object> result =
hContext->Global()->GetPrototype().As<v8::Object>();
return handle_scope.Escape(result);
}
v8::Local<v8::Context> CFXJSE_Context::GetContext() {
return v8::Local<v8::Context>::New(GetIsolate(), m_hContext);
}
void CFXJSE_Context::AddClass(std::unique_ptr<CFXJSE_Class> pClass) {
m_rgClasses.push_back(std::move(pClass));
}
CFXJSE_Class* CFXJSE_Context::GetClassByName(ByteStringView szName) const {
auto pClass =
std::find_if(m_rgClasses.begin(), m_rgClasses.end(),
[szName](const std::unique_ptr<CFXJSE_Class>& item) {
return item->IsName(szName);
});
return pClass != m_rgClasses.end() ? pClass->get() : nullptr;
}
void CFXJSE_Context::EnableCompatibleMode() {
ExecuteScript(szCompatibleModeScript, nullptr, v8::Local<v8::Object>());
ExecuteScript(szConsoleScript, nullptr, v8::Local<v8::Object>());
}
bool CFXJSE_Context::ExecuteScript(const char* szScript,
CFXJSE_Value* lpRetValue,
v8::Local<v8::Object> hNewThis) {
CFXJSE_ScopeUtil_IsolateHandleContext scope(this);
v8::Local<v8::Context> hContext = GetIsolate()->GetCurrentContext();
v8::TryCatch trycatch(GetIsolate());
v8::Local<v8::String> hScriptString =
fxv8::NewStringHelper(GetIsolate(), szScript);
if (hNewThis.IsEmpty()) {
v8::Local<v8::Script> hScript;
if (v8::Script::Compile(hContext, hScriptString).ToLocal(&hScript)) {
DCHECK(!trycatch.HasCaught());
v8::Local<v8::Value> hValue;
if (hScript->Run(hContext).ToLocal(&hValue)) {
DCHECK(!trycatch.HasCaught());
if (lpRetValue)
lpRetValue->ForceSetValue(GetIsolate(), hValue);
return true;
}
}
if (lpRetValue)
lpRetValue->ForceSetValue(GetIsolate(),
CreateReturnValue(GetIsolate(), &trycatch));
return false;
}
v8::Local<v8::String> hEval = fxv8::NewStringHelper(
GetIsolate(), "(function () { return eval(arguments[0]); })");
v8::Local<v8::Script> hWrapper =
v8::Script::Compile(hContext, hEval).ToLocalChecked();
v8::Local<v8::Value> hWrapperValue;
if (hWrapper->Run(hContext).ToLocal(&hWrapperValue)) {
DCHECK(!trycatch.HasCaught());
v8::Local<v8::Function> hWrapperFn = hWrapperValue.As<v8::Function>();
v8::Local<v8::Value> rgArgs[] = {hScriptString};
v8::Local<v8::Value> hValue;
if (hWrapperFn->Call(hContext, hNewThis.As<v8::Object>(), 1, rgArgs)
.ToLocal(&hValue)) {
DCHECK(!trycatch.HasCaught());
if (lpRetValue)
lpRetValue->ForceSetValue(GetIsolate(), hValue);
return true;
}
}
#ifndef NDEBUG
v8::String::Utf8Value error(GetIsolate(), trycatch.Exception());
fprintf(stderr, "JS Error: %s\n", *error);
v8::Local<v8::Message> message = trycatch.Message();
if (!message.IsEmpty()) {
v8::Local<v8::Context> context(GetIsolate()->GetCurrentContext());
int linenum = message->GetLineNumber(context).FromJust();
v8::String::Utf8Value sourceline(
GetIsolate(), message->GetSourceLine(context).ToLocalChecked());
fprintf(stderr, "Line %d: %s\n", linenum, *sourceline);
}
#endif // NDEBUG
if (lpRetValue) {
lpRetValue->ForceSetValue(GetIsolate(),
CreateReturnValue(GetIsolate(), &trycatch));
}
return false;
}