// 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/cfxjse_context.h" #include <utility> #include "fxjs/cfxjse_class.h" #include "fxjs/cfxjse_value.h" #include "third_party/base/ptr_util.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']}));"; wchar_t g_FXJSETagString[] = L"FXJSE_HostObject"; } // namespace // Note, not in the anonymous namespace due to the friend call // in cfxjse_context.h // TODO(dsinclair): Remove the friending, use public methods. class CFXJSE_ScopeUtil_IsolateHandleContext { public: explicit CFXJSE_ScopeUtil_IsolateHandleContext(CFXJSE_Context* pContext) : m_context(pContext), m_parent(pContext->m_pIsolate), m_cscope(v8::Local<v8::Context>::New(pContext->m_pIsolate, pContext->m_hContext)) {} v8::Isolate* GetIsolate() { return m_context->m_pIsolate; } v8::Local<v8::Context> GetLocalContext() { return v8::Local<v8::Context>::New(m_context->m_pIsolate, m_context->m_hContext); } private: CFXJSE_ScopeUtil_IsolateHandleContext( const CFXJSE_ScopeUtil_IsolateHandleContext&) = delete; void operator=(const CFXJSE_ScopeUtil_IsolateHandleContext&) = delete; void* operator new(size_t size) = delete; void operator delete(void*, size_t) = delete; UnownedPtr<CFXJSE_Context> m_context; CFXJSE_ScopeUtil_IsolateHandle m_parent; v8::Context::Scope m_cscope; }; v8::Local<v8::Object> FXJSE_GetGlobalObjectFromContext( const v8::Local<v8::Context>& hContext) { return hContext->Global()->GetPrototype().As<v8::Object>(); } void FXJSE_UpdateObjectBinding(v8::Local<v8::Object>& hObject, CFXJSE_HostObject* lpNewBinding) { ASSERT(!hObject.IsEmpty()); ASSERT(hObject->InternalFieldCount() == 2); hObject->SetAlignedPointerInInternalField(0, g_FXJSETagString); hObject->SetAlignedPointerInInternalField(1, lpNewBinding); } CFXJSE_HostObject* FXJSE_RetrieveObjectBinding( const v8::Local<v8::Object>& hJSObject, CFXJSE_Class* lpClass) { ASSERT(!hJSObject.IsEmpty()); if (!hJSObject->IsObject()) return nullptr; v8::Local<v8::Object> hObject = hJSObject; if (hObject->InternalFieldCount() != 2) { v8::Local<v8::Value> hProtoObject = hObject->GetPrototype(); if (hProtoObject.IsEmpty() || !hProtoObject->IsObject()) return nullptr; hObject = hProtoObject.As<v8::Object>(); if (hObject->InternalFieldCount() != 2) return nullptr; } if (hObject->GetAlignedPointerFromInternalField(0) != g_FXJSETagString) return nullptr; if (lpClass) { v8::Local<v8::FunctionTemplate> hClass = v8::Local<v8::FunctionTemplate>::New( lpClass->GetContext()->GetIsolate(), lpClass->GetTemplate()); if (!hClass->HasInstance(hObject)) return nullptr; } return static_cast<CFXJSE_HostObject*>( hObject->GetAlignedPointerFromInternalField(1)); } v8::Local<v8::Object> FXJSE_CreateReturnValue(v8::Isolate* pIsolate, v8::TryCatch& trycatch) { v8::Local<v8::Object> hReturnValue = v8::Object::New(pIsolate); if (trycatch.HasCaught()) { v8::Local<v8::Value> hException = trycatch.Exception(); v8::Local<v8::Message> hMessage = trycatch.Message(); if (hException->IsObject()) { v8::Local<v8::Value> hValue; hValue = hException.As<v8::Object>()->Get( v8::String::NewFromUtf8(pIsolate, "name")); if (hValue->IsString() || hValue->IsStringObject()) hReturnValue->Set(0, hValue); else hReturnValue->Set(0, v8::String::NewFromUtf8(pIsolate, "Error")); hValue = hException.As<v8::Object>()->Get( v8::String::NewFromUtf8(pIsolate, "message")); if (hValue->IsString() || hValue->IsStringObject()) hReturnValue->Set(1, hValue); else hReturnValue->Set(1, hMessage->Get()); } else { hReturnValue->Set(0, v8::String::NewFromUtf8(pIsolate, "Error")); hReturnValue->Set(1, hMessage->Get()); } hReturnValue->Set(2, hException); hReturnValue->Set(3, v8::Integer::New(pIsolate, hMessage->GetLineNumber())); hReturnValue->Set(4, hMessage->GetSourceLine()); v8::Maybe<int32_t> maybe_int = hMessage->GetStartColumn(pIsolate->GetCurrentContext()); hReturnValue->Set(5, v8::Integer::New(pIsolate, maybe_int.FromMaybe(0))); maybe_int = hMessage->GetEndColumn(pIsolate->GetCurrentContext()); hReturnValue->Set(6, v8::Integer::New(pIsolate, maybe_int.FromMaybe(0))); } return hReturnValue; } // static std::unique_ptr<CFXJSE_Context> CFXJSE_Context::Create( v8::Isolate* pIsolate, const FXJSE_CLASS_DESCRIPTOR* pGlobalClass, CFXJSE_HostObject* pGlobalObject) { CFXJSE_ScopeUtil_IsolateHandle scope(pIsolate); auto pContext = pdfium::MakeUnique<CFXJSE_Context>(pIsolate); CFXJSE_Class* pGlobalClassObj = nullptr; v8::Local<v8::ObjectTemplate> hObjectTemplate; if (pGlobalClass) { pGlobalClassObj = CFXJSE_Class::Create(pContext.get(), pGlobalClass, true); ASSERT(pGlobalClassObj); v8::Local<v8::FunctionTemplate> hFunctionTemplate = v8::Local<v8::FunctionTemplate>::New(pIsolate, pGlobalClassObj->m_hTemplate); hObjectTemplate = hFunctionTemplate->InstanceTemplate(); } else { hObjectTemplate = v8::ObjectTemplate::New(pIsolate); hObjectTemplate->SetInternalFieldCount(2); } hObjectTemplate->Set( v8::Symbol::GetToStringTag(pIsolate), v8::String::NewFromUtf8(pIsolate, "global", v8::NewStringType::kNormal) .ToLocalChecked()); v8::Local<v8::Context> hNewContext = v8::Context::New(pIsolate, nullptr, hObjectTemplate); v8::Local<v8::Context> hRootContext = v8::Local<v8::Context>::New( pIsolate, CFXJSE_RuntimeData::Get(pIsolate)->m_hRootContext); hNewContext->SetSecurityToken(hRootContext->GetSecurityToken()); v8::Local<v8::Object> hGlobalObject = FXJSE_GetGlobalObjectFromContext(hNewContext); FXJSE_UpdateObjectBinding(hGlobalObject, pGlobalObject); pContext->m_hContext.Reset(pIsolate, hNewContext); return pContext; } CFXJSE_Context::CFXJSE_Context(v8::Isolate* pIsolate) : m_pIsolate(pIsolate) {} CFXJSE_Context::~CFXJSE_Context() {} std::unique_ptr<CFXJSE_Value> CFXJSE_Context::GetGlobalObject() { auto pValue = pdfium::MakeUnique<CFXJSE_Value>(m_pIsolate); CFXJSE_ScopeUtil_IsolateHandleContext scope(this); v8::Local<v8::Context> hContext = v8::Local<v8::Context>::New(m_pIsolate, m_hContext); v8::Local<v8::Object> hGlobalObject = FXJSE_GetGlobalObjectFromContext(hContext); pValue->ForceSetValue(hGlobalObject); return pValue; } v8::Local<v8::Context> CFXJSE_Context::GetContext() { return v8::Local<v8::Context>::New(m_pIsolate, m_hContext); } void CFXJSE_Context::AddClass(std::unique_ptr<CFXJSE_Class> pClass) { m_rgClasses.push_back(std::move(pClass)); } CFXJSE_Class* CFXJSE_Context::GetClassByName( const ByteStringView& szName) const { auto pClass = std::find_if(m_rgClasses.begin(), m_rgClasses.end(), [szName](const std::unique_ptr<CFXJSE_Class>& item) { return szName == item->m_szClassName; }); return pClass != m_rgClasses.end() ? pClass->get() : nullptr; } void CFXJSE_Context::EnableCompatibleMode() { ExecuteScript(szCompatibleModeScript, nullptr, nullptr); } bool CFXJSE_Context::ExecuteScript(const char* szScript, CFXJSE_Value* lpRetValue, CFXJSE_Value* lpNewThisObject) { CFXJSE_ScopeUtil_IsolateHandleContext scope(this); v8::TryCatch trycatch(m_pIsolate); v8::Local<v8::String> hScriptString = v8::String::NewFromUtf8(m_pIsolate, szScript); if (!lpNewThisObject) { v8::Local<v8::Script> hScript = v8::Script::Compile(hScriptString); if (!trycatch.HasCaught()) { v8::Local<v8::Value> hValue = hScript->Run(); if (!trycatch.HasCaught()) { if (lpRetValue) lpRetValue->m_hValue.Reset(m_pIsolate, hValue); return true; } } if (lpRetValue) { lpRetValue->m_hValue.Reset(m_pIsolate, FXJSE_CreateReturnValue(m_pIsolate, trycatch)); } return false; } v8::Local<v8::Value> hNewThis = v8::Local<v8::Value>::New(m_pIsolate, lpNewThisObject->m_hValue); ASSERT(!hNewThis.IsEmpty()); v8::Local<v8::Script> hWrapper = v8::Script::Compile(v8::String::NewFromUtf8( m_pIsolate, "(function () { return eval(arguments[0]); })")); v8::Local<v8::Value> hWrapperValue = hWrapper->Run(); ASSERT(hWrapperValue->IsFunction()); v8::Local<v8::Function> hWrapperFn = hWrapperValue.As<v8::Function>(); if (!trycatch.HasCaught()) { v8::Local<v8::Value> rgArgs[] = {hScriptString}; v8::Local<v8::Value> hValue = hWrapperFn->Call(hNewThis.As<v8::Object>(), 1, rgArgs); if (!trycatch.HasCaught()) { if (lpRetValue) lpRetValue->m_hValue.Reset(m_pIsolate, hValue); return true; } } if (lpRetValue) { lpRetValue->m_hValue.Reset(m_pIsolate, FXJSE_CreateReturnValue(m_pIsolate, trycatch)); } return false; }