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module_wrap.cc
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module_wrap.cc
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#include "module_wrap.h"
#include "env.h"
#include "memory_tracker-inl.h"
#include "node_contextify.h"
#include "node_errors.h"
#include "node_internals.h"
#include "node_process.h"
#include "node_url.h"
#include "node_watchdog.h"
#include "util-inl.h"
#include <sys/stat.h> // S_IFDIR
#include <algorithm>
namespace node {
namespace loader {
using errors::TryCatchScope;
using node::contextify::ContextifyContext;
using node::url::URL;
using node::url::URL_FLAGS_FAILED;
using v8::Array;
using v8::ArrayBufferView;
using v8::Context;
using v8::EscapableHandleScope;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::Global;
using v8::HandleScope;
using v8::Integer;
using v8::IntegrityLevel;
using v8::Isolate;
using v8::Just;
using v8::Local;
using v8::Maybe;
using v8::MaybeLocal;
using v8::Module;
using v8::Nothing;
using v8::Number;
using v8::Object;
using v8::PrimitiveArray;
using v8::Promise;
using v8::ScriptCompiler;
using v8::ScriptOrigin;
using v8::ScriptOrModule;
using v8::String;
using v8::UnboundModuleScript;
using v8::Undefined;
using v8::Value;
static const char* const EXTENSIONS[] = {
".js",
".json",
".node",
".mjs"
};
ModuleWrap::ModuleWrap(Environment* env,
Local<Object> object,
Local<Module> module,
Local<String> url) :
BaseObject(env, object),
id_(env->get_next_module_id()) {
module_.Reset(env->isolate(), module);
url_.Reset(env->isolate(), url);
env->id_to_module_map.emplace(id_, this);
}
ModuleWrap::~ModuleWrap() {
HandleScope scope(env()->isolate());
Local<Module> module = module_.Get(env()->isolate());
env()->id_to_module_map.erase(id_);
auto range = env()->hash_to_module_map.equal_range(module->GetIdentityHash());
for (auto it = range.first; it != range.second; ++it) {
if (it->second == this) {
env()->hash_to_module_map.erase(it);
break;
}
}
}
ModuleWrap* ModuleWrap::GetFromModule(Environment* env,
Local<Module> module) {
auto range = env->hash_to_module_map.equal_range(module->GetIdentityHash());
for (auto it = range.first; it != range.second; ++it) {
if (it->second->module_ == module) {
return it->second;
}
}
return nullptr;
}
ModuleWrap* ModuleWrap::GetFromID(Environment* env, uint32_t id) {
auto module_wrap_it = env->id_to_module_map.find(id);
if (module_wrap_it == env->id_to_module_map.end()) {
return nullptr;
}
return module_wrap_it->second;
}
// new ModuleWrap(url, context, source, lineOffset, columnOffset)
// new ModuleWrap(url, context, exportNames, syntheticExecutionFunction)
void ModuleWrap::New(const FunctionCallbackInfo<Value>& args) {
CHECK(args.IsConstructCall());
CHECK_GE(args.Length(), 3);
Environment* env = Environment::GetCurrent(args);
Isolate* isolate = env->isolate();
Local<Object> that = args.This();
CHECK(args[0]->IsString());
Local<String> url = args[0].As<String>();
Local<Context> context;
if (args[1]->IsUndefined()) {
context = that->CreationContext();
} else {
CHECK(args[1]->IsObject());
ContextifyContext* sandbox =
ContextifyContext::ContextFromContextifiedSandbox(
env, args[1].As<Object>());
CHECK_NOT_NULL(sandbox);
context = sandbox->context();
}
Local<Integer> line_offset;
Local<Integer> column_offset;
bool synthetic = args[2]->IsArray();
if (synthetic) {
// new ModuleWrap(url, context, exportNames, syntheticExecutionFunction)
CHECK(args[3]->IsFunction());
} else {
// new ModuleWrap(url, context, source, lineOffset, columOffset, cachedData)
CHECK(args[2]->IsString());
CHECK(args[3]->IsNumber());
line_offset = args[3].As<Integer>();
CHECK(args[4]->IsNumber());
column_offset = args[4].As<Integer>();
}
Local<PrimitiveArray> host_defined_options =
PrimitiveArray::New(isolate, HostDefinedOptions::kLength);
host_defined_options->Set(isolate, HostDefinedOptions::kType,
Number::New(isolate, ScriptType::kModule));
ShouldNotAbortOnUncaughtScope no_abort_scope(env);
TryCatchScope try_catch(env);
Local<Module> module;
{
Context::Scope context_scope(context);
if (synthetic) {
CHECK(args[2]->IsArray());
Local<Array> export_names_arr = args[2].As<Array>();
uint32_t len = export_names_arr->Length();
std::vector<Local<String>> export_names(len);
for (uint32_t i = 0; i < len; i++) {
Local<Value> export_name_val =
export_names_arr->Get(context, i).ToLocalChecked();
CHECK(export_name_val->IsString());
export_names[i] = export_name_val.As<String>();
}
module = Module::CreateSyntheticModule(isolate, url, export_names,
SyntheticModuleEvaluationStepsCallback);
} else {
ScriptCompiler::CachedData* cached_data = nullptr;
if (!args[5]->IsUndefined()) {
CHECK(args[5]->IsArrayBufferView());
Local<ArrayBufferView> cached_data_buf = args[5].As<ArrayBufferView>();
uint8_t* data = static_cast<uint8_t*>(
cached_data_buf->Buffer()->GetBackingStore()->Data());
cached_data =
new ScriptCompiler::CachedData(data + cached_data_buf->ByteOffset(),
cached_data_buf->ByteLength());
}
Local<String> source_text = args[2].As<String>();
ScriptOrigin origin(url,
line_offset, // line offset
column_offset, // column offset
True(isolate), // is cross origin
Local<Integer>(), // script id
Local<Value>(), // source map URL
False(isolate), // is opaque (?)
False(isolate), // is WASM
True(isolate), // is ES Module
host_defined_options);
ScriptCompiler::Source source(source_text, origin, cached_data);
ScriptCompiler::CompileOptions options;
if (source.GetCachedData() == nullptr) {
options = ScriptCompiler::kNoCompileOptions;
} else {
options = ScriptCompiler::kConsumeCodeCache;
}
if (!ScriptCompiler::CompileModule(isolate, &source, options)
.ToLocal(&module)) {
if (try_catch.HasCaught() && !try_catch.HasTerminated()) {
CHECK(!try_catch.Message().IsEmpty());
CHECK(!try_catch.Exception().IsEmpty());
AppendExceptionLine(env, try_catch.Exception(), try_catch.Message(),
ErrorHandlingMode::MODULE_ERROR);
try_catch.ReThrow();
}
return;
}
if (options == ScriptCompiler::kConsumeCodeCache &&
source.GetCachedData()->rejected) {
THROW_ERR_VM_MODULE_CACHED_DATA_REJECTED(
env, "cachedData buffer was rejected");
try_catch.ReThrow();
return;
}
}
}
if (!that->Set(context, env->url_string(), url).FromMaybe(false)) {
return;
}
ModuleWrap* obj = new ModuleWrap(env, that, module, url);
if (synthetic) {
obj->synthetic_ = true;
obj->synthetic_evaluation_steps_.Reset(
env->isolate(), args[3].As<Function>());
}
obj->context_.Reset(isolate, context);
env->hash_to_module_map.emplace(module->GetIdentityHash(), obj);
host_defined_options->Set(isolate, HostDefinedOptions::kID,
Number::New(isolate, obj->id()));
that->SetIntegrityLevel(context, IntegrityLevel::kFrozen);
args.GetReturnValue().Set(that);
}
void ModuleWrap::Link(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Isolate* isolate = args.GetIsolate();
CHECK_EQ(args.Length(), 1);
CHECK(args[0]->IsFunction());
Local<Object> that = args.This();
ModuleWrap* obj;
ASSIGN_OR_RETURN_UNWRAP(&obj, that);
if (obj->linked_)
return;
obj->linked_ = true;
Local<Function> resolver_arg = args[0].As<Function>();
Local<Context> mod_context = obj->context_.Get(isolate);
Local<Module> module = obj->module_.Get(isolate);
const int module_requests_length = module->GetModuleRequestsLength();
MaybeStackBuffer<Local<Value>, 16> promises(module_requests_length);
// call the dependency resolve callbacks
for (int i = 0; i < module_requests_length; i++) {
Local<String> specifier = module->GetModuleRequest(i);
Utf8Value specifier_utf8(env->isolate(), specifier);
std::string specifier_std(*specifier_utf8, specifier_utf8.length());
Local<Value> argv[] = {
specifier
};
MaybeLocal<Value> maybe_resolve_return_value =
resolver_arg->Call(mod_context, that, 1, argv);
if (maybe_resolve_return_value.IsEmpty()) {
return;
}
Local<Value> resolve_return_value =
maybe_resolve_return_value.ToLocalChecked();
if (!resolve_return_value->IsPromise()) {
env->ThrowError("linking error, expected resolver to return a promise");
}
Local<Promise> resolve_promise = resolve_return_value.As<Promise>();
obj->resolve_cache_[specifier_std].Reset(env->isolate(), resolve_promise);
promises[i] = resolve_promise;
}
args.GetReturnValue().Set(
Array::New(isolate, promises.out(), promises.length()));
}
void ModuleWrap::Instantiate(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Isolate* isolate = args.GetIsolate();
ModuleWrap* obj;
ASSIGN_OR_RETURN_UNWRAP(&obj, args.This());
Local<Context> context = obj->context_.Get(isolate);
Local<Module> module = obj->module_.Get(isolate);
TryCatchScope try_catch(env);
USE(module->InstantiateModule(context, ResolveCallback));
// clear resolve cache on instantiate
obj->resolve_cache_.clear();
if (try_catch.HasCaught() && !try_catch.HasTerminated()) {
CHECK(!try_catch.Message().IsEmpty());
CHECK(!try_catch.Exception().IsEmpty());
AppendExceptionLine(env, try_catch.Exception(), try_catch.Message(),
ErrorHandlingMode::MODULE_ERROR);
try_catch.ReThrow();
return;
}
}
void ModuleWrap::Evaluate(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Isolate* isolate = env->isolate();
ModuleWrap* obj;
ASSIGN_OR_RETURN_UNWRAP(&obj, args.This());
Local<Context> context = obj->context_.Get(isolate);
Local<Module> module = obj->module_.Get(isolate);
// module.evaluate(timeout, breakOnSigint)
CHECK_EQ(args.Length(), 2);
CHECK(args[0]->IsNumber());
int64_t timeout = args[0]->IntegerValue(env->context()).FromJust();
CHECK(args[1]->IsBoolean());
bool break_on_sigint = args[1]->IsTrue();
ShouldNotAbortOnUncaughtScope no_abort_scope(env);
TryCatchScope try_catch(env);
bool timed_out = false;
bool received_signal = false;
MaybeLocal<Value> result;
if (break_on_sigint && timeout != -1) {
Watchdog wd(isolate, timeout, &timed_out);
SigintWatchdog swd(isolate, &received_signal);
result = module->Evaluate(context);
} else if (break_on_sigint) {
SigintWatchdog swd(isolate, &received_signal);
result = module->Evaluate(context);
} else if (timeout != -1) {
Watchdog wd(isolate, timeout, &timed_out);
result = module->Evaluate(context);
} else {
result = module->Evaluate(context);
}
if (result.IsEmpty()) {
CHECK(try_catch.HasCaught());
}
// Convert the termination exception into a regular exception.
if (timed_out || received_signal) {
if (!env->is_main_thread() && env->is_stopping())
return;
env->isolate()->CancelTerminateExecution();
// 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) {
THROW_ERR_SCRIPT_EXECUTION_TIMEOUT(env, timeout);
} else if (received_signal) {
THROW_ERR_SCRIPT_EXECUTION_INTERRUPTED(env);
}
}
if (try_catch.HasCaught()) {
if (!try_catch.HasTerminated())
try_catch.ReThrow();
return;
}
args.GetReturnValue().Set(result.ToLocalChecked());
}
void ModuleWrap::GetNamespace(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Isolate* isolate = args.GetIsolate();
ModuleWrap* obj;
ASSIGN_OR_RETURN_UNWRAP(&obj, args.This());
Local<Module> module = obj->module_.Get(isolate);
switch (module->GetStatus()) {
default:
return env->ThrowError(
"cannot get namespace, Module has not been instantiated");
case v8::Module::Status::kInstantiated:
case v8::Module::Status::kEvaluating:
case v8::Module::Status::kEvaluated:
break;
}
Local<Value> result = module->GetModuleNamespace();
args.GetReturnValue().Set(result);
}
void ModuleWrap::GetStatus(const FunctionCallbackInfo<Value>& args) {
Isolate* isolate = args.GetIsolate();
ModuleWrap* obj;
ASSIGN_OR_RETURN_UNWRAP(&obj, args.This());
Local<Module> module = obj->module_.Get(isolate);
args.GetReturnValue().Set(module->GetStatus());
}
void ModuleWrap::GetStaticDependencySpecifiers(
const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
ModuleWrap* obj;
ASSIGN_OR_RETURN_UNWRAP(&obj, args.This());
Local<Module> module = obj->module_.Get(env->isolate());
int count = module->GetModuleRequestsLength();
MaybeStackBuffer<Local<Value>, 16> specifiers(count);
for (int i = 0; i < count; i++)
specifiers[i] = module->GetModuleRequest(i);
args.GetReturnValue().Set(
Array::New(env->isolate(), specifiers.out(), count));
}
void ModuleWrap::GetError(const FunctionCallbackInfo<Value>& args) {
Isolate* isolate = args.GetIsolate();
ModuleWrap* obj;
ASSIGN_OR_RETURN_UNWRAP(&obj, args.This());
Local<Module> module = obj->module_.Get(isolate);
args.GetReturnValue().Set(module->GetException());
}
MaybeLocal<Module> ModuleWrap::ResolveCallback(Local<Context> context,
Local<String> specifier,
Local<Module> referrer) {
Environment* env = Environment::GetCurrent(context);
CHECK_NOT_NULL(env); // TODO(addaleax): Handle nullptr here.
Isolate* isolate = env->isolate();
ModuleWrap* dependent = GetFromModule(env, referrer);
if (dependent == nullptr) {
env->ThrowError("linking error, null dep");
return MaybeLocal<Module>();
}
Utf8Value specifier_utf8(isolate, specifier);
std::string specifier_std(*specifier_utf8, specifier_utf8.length());
if (dependent->resolve_cache_.count(specifier_std) != 1) {
env->ThrowError("linking error, not in local cache");
return MaybeLocal<Module>();
}
Local<Promise> resolve_promise =
dependent->resolve_cache_[specifier_std].Get(isolate);
if (resolve_promise->State() != Promise::kFulfilled) {
env->ThrowError("linking error, dependency promises must be resolved on "
"instantiate");
return MaybeLocal<Module>();
}
Local<Object> module_object = resolve_promise->Result().As<Object>();
if (module_object.IsEmpty() || !module_object->IsObject()) {
env->ThrowError("linking error, expected a valid module object from "
"resolver");
return MaybeLocal<Module>();
}
ModuleWrap* module;
ASSIGN_OR_RETURN_UNWRAP(&module, module_object, MaybeLocal<Module>());
return module->module_.Get(isolate);
}
namespace {
// Tests whether a path starts with /, ./ or ../
// In WhatWG terminology, the alternative case is called a "bare" specifier
// (e.g. in `import "jquery"`).
inline bool ShouldBeTreatedAsRelativeOrAbsolutePath(
const std::string& specifier) {
size_t len = specifier.length();
if (len == 0)
return false;
if (specifier[0] == '/') {
return true;
} else if (specifier[0] == '.') {
if (len == 1 || specifier[1] == '/')
return true;
if (specifier[1] == '.') {
if (len == 2 || specifier[2] == '/')
return true;
}
}
return false;
}
std::string ReadFile(uv_file file) {
std::string contents;
uv_fs_t req;
char buffer_memory[4096];
uv_buf_t buf = uv_buf_init(buffer_memory, sizeof(buffer_memory));
do {
const int r = uv_fs_read(nullptr,
&req,
file,
&buf,
1,
contents.length(), // offset
nullptr);
uv_fs_req_cleanup(&req);
if (r <= 0)
break;
contents.append(buf.base, r);
} while (true);
return contents;
}
enum DescriptorType {
FILE,
DIRECTORY,
NONE
};
// When DescriptorType cache is added, this can also return
// Nothing for the "null" cache entries.
inline Maybe<uv_file> OpenDescriptor(const std::string& path) {
uv_fs_t fs_req;
#ifdef _WIN32
std::string pth = "\\\\.\\" + path;
uv_file fd = uv_fs_open(nullptr, &fs_req, pth.c_str(), O_RDONLY, 0, nullptr);
#else
uv_file fd = uv_fs_open(nullptr, &fs_req, path.c_str(), O_RDONLY, 0, nullptr);
#endif
uv_fs_req_cleanup(&fs_req);
if (fd < 0) return Nothing<uv_file>();
return Just(fd);
}
inline void CloseDescriptor(uv_file fd) {
uv_fs_t fs_req;
CHECK_EQ(0, uv_fs_close(nullptr, &fs_req, fd, nullptr));
uv_fs_req_cleanup(&fs_req);
}
inline DescriptorType CheckDescriptorAtFile(uv_file fd) {
uv_fs_t fs_req;
int rc = uv_fs_fstat(nullptr, &fs_req, fd, nullptr);
if (rc == 0) {
uint64_t is_directory = fs_req.statbuf.st_mode & S_IFDIR;
uv_fs_req_cleanup(&fs_req);
return is_directory ? DIRECTORY : FILE;
}
uv_fs_req_cleanup(&fs_req);
return NONE;
}
// TODO(@guybedford): Add a DescriptorType cache layer here.
// Should be directory based -> if path/to/dir doesn't exist
// then the cache should early-fail any path/to/dir/file check.
DescriptorType CheckDescriptorAtPath(const std::string& path) {
Maybe<uv_file> fd = OpenDescriptor(path);
if (fd.IsNothing()) return NONE;
DescriptorType type = CheckDescriptorAtFile(fd.FromJust());
CloseDescriptor(fd.FromJust());
return type;
}
Maybe<std::string> ReadIfFile(const std::string& path) {
Maybe<uv_file> fd = OpenDescriptor(path);
if (fd.IsNothing()) return Nothing<std::string>();
DescriptorType type = CheckDescriptorAtFile(fd.FromJust());
if (type != FILE) return Nothing<std::string>();
std::string source = ReadFile(fd.FromJust());
CloseDescriptor(fd.FromJust());
return Just(source);
}
using Exists = PackageConfig::Exists;
using IsValid = PackageConfig::IsValid;
using HasMain = PackageConfig::HasMain;
using HasName = PackageConfig::HasName;
using PackageType = PackageConfig::PackageType;
Maybe<const PackageConfig*> GetPackageConfig(Environment* env,
const std::string& path,
const URL& base) {
auto existing = env->package_json_cache.find(path);
if (existing != env->package_json_cache.end()) {
const PackageConfig* pcfg = &existing->second;
if (pcfg->is_valid == IsValid::No) {
std::string msg = "Invalid JSON in " + path +
" imported from " + base.ToFilePath();
node::THROW_ERR_INVALID_PACKAGE_CONFIG(env, msg.c_str());
return Nothing<const PackageConfig*>();
}
return Just(pcfg);
}
Maybe<std::string> source = ReadIfFile(path);
if (source.IsNothing()) {
auto entry = env->package_json_cache.emplace(path,
PackageConfig { Exists::No, IsValid::Yes, HasMain::No, "",
HasName::No, "",
PackageType::None, Global<Value>() });
return Just(&entry.first->second);
}
std::string pkg_src = source.FromJust();
Isolate* isolate = env->isolate();
HandleScope handle_scope(isolate);
Local<Object> pkg_json;
{
Local<Value> src;
Local<Value> pkg_json_v;
Local<Context> context = env->context();
if (!ToV8Value(context, pkg_src).ToLocal(&src) ||
!v8::JSON::Parse(context, src.As<String>()).ToLocal(&pkg_json_v) ||
!pkg_json_v->ToObject(context).ToLocal(&pkg_json)) {
env->package_json_cache.emplace(path,
PackageConfig { Exists::Yes, IsValid::No, HasMain::No, "",
HasName::No, "",
PackageType::None, Global<Value>() });
std::string msg = "Invalid JSON in " + path +
" imported from " + base.ToFilePath();
node::THROW_ERR_INVALID_PACKAGE_CONFIG(env, msg.c_str());
return Nothing<const PackageConfig*>();
}
}
Local<Value> pkg_main;
HasMain has_main = HasMain::No;
std::string main_std;
if (pkg_json->Get(env->context(), env->main_string()).ToLocal(&pkg_main)) {
if (pkg_main->IsString()) {
has_main = HasMain::Yes;
}
Utf8Value main_utf8(isolate, pkg_main);
main_std.assign(std::string(*main_utf8, main_utf8.length()));
}
Local<Value> pkg_name;
HasName has_name = HasName::No;
std::string name_std;
if (pkg_json->Get(env->context(), env->name_string()).ToLocal(&pkg_name)) {
if (pkg_name->IsString()) {
has_name = HasName::Yes;
Utf8Value name_utf8(isolate, pkg_name);
name_std.assign(std::string(*name_utf8, name_utf8.length()));
}
}
PackageType pkg_type = PackageType::None;
Local<Value> type_v;
if (pkg_json->Get(env->context(), env->type_string()).ToLocal(&type_v)) {
if (type_v->StrictEquals(env->module_string())) {
pkg_type = PackageType::Module;
} else if (type_v->StrictEquals(env->commonjs_string())) {
pkg_type = PackageType::CommonJS;
}
// ignore unknown types for forwards compatibility
}
Local<Value> exports_v;
if (pkg_json->Get(env->context(),
env->exports_string()).ToLocal(&exports_v) &&
!exports_v->IsNullOrUndefined()) {
Global<Value> exports;
exports.Reset(env->isolate(), exports_v);
auto entry = env->package_json_cache.emplace(path,
PackageConfig { Exists::Yes, IsValid::Yes, has_main, main_std,
has_name, name_std,
pkg_type, std::move(exports) });
return Just(&entry.first->second);
}
auto entry = env->package_json_cache.emplace(path,
PackageConfig { Exists::Yes, IsValid::Yes, has_main, main_std,
has_name, name_std,
pkg_type, Global<Value>() });
return Just(&entry.first->second);
}
Maybe<const PackageConfig*> GetPackageScopeConfig(Environment* env,
const URL& resolved,
const URL& base) {
URL pjson_url("./package.json", &resolved);
while (true) {
std::string pjson_url_path = pjson_url.path();
if (pjson_url_path.length() > 25 &&
pjson_url_path.substr(pjson_url_path.length() - 25, 25) ==
"node_modules/package.json") {
break;
}
Maybe<const PackageConfig*> pkg_cfg =
GetPackageConfig(env, pjson_url.ToFilePath(), base);
if (pkg_cfg.IsNothing()) return pkg_cfg;
if (pkg_cfg.FromJust()->exists == Exists::Yes) return pkg_cfg;
URL last_pjson_url = pjson_url;
pjson_url = URL("../package.json", pjson_url);
// Terminates at root where ../package.json equals ../../package.json
// (can't just check "/package.json" for Windows support).
if (pjson_url.path() == last_pjson_url.path()) break;
}
auto entry = env->package_json_cache.emplace(pjson_url.ToFilePath(),
PackageConfig { Exists::No, IsValid::Yes, HasMain::No, "",
HasName::No, "",
PackageType::None, Global<Value>() });
const PackageConfig* pcfg = &entry.first->second;
return Just(pcfg);
}
/*
* Legacy CommonJS main resolution:
* 1. let M = pkg_url + (json main field)
* 2. TRY(M, M.js, M.json, M.node)
* 3. TRY(M/index.js, M/index.json, M/index.node)
* 4. TRY(pkg_url/index.js, pkg_url/index.json, pkg_url/index.node)
* 5. NOT_FOUND
*/
inline bool FileExists(const URL& url) {
return CheckDescriptorAtPath(url.ToFilePath()) == FILE;
}
Maybe<URL> LegacyMainResolve(const URL& pjson_url,
const PackageConfig& pcfg) {
URL guess;
if (pcfg.has_main == HasMain::Yes) {
// Note: fs check redundances will be handled by Descriptor cache here.
if (FileExists(guess = URL("./" + pcfg.main, pjson_url))) {
return Just(guess);
}
if (FileExists(guess = URL("./" + pcfg.main + ".js", pjson_url))) {
return Just(guess);
}
if (FileExists(guess = URL("./" + pcfg.main + ".json", pjson_url))) {
return Just(guess);
}
if (FileExists(guess = URL("./" + pcfg.main + ".node", pjson_url))) {
return Just(guess);
}
if (FileExists(guess = URL("./" + pcfg.main + "/index.js", pjson_url))) {
return Just(guess);
}
// Such stat.
if (FileExists(guess = URL("./" + pcfg.main + "/index.json", pjson_url))) {
return Just(guess);
}
if (FileExists(guess = URL("./" + pcfg.main + "/index.node", pjson_url))) {
return Just(guess);
}
// Fallthrough.
}
if (FileExists(guess = URL("./index.js", pjson_url))) {
return Just(guess);
}
// So fs.
if (FileExists(guess = URL("./index.json", pjson_url))) {
return Just(guess);
}
if (FileExists(guess = URL("./index.node", pjson_url))) {
return Just(guess);
}
// Not found.
return Nothing<URL>();
}
enum ResolveExtensionsOptions {
TRY_EXACT_NAME,
ONLY_VIA_EXTENSIONS
};
template <ResolveExtensionsOptions options>
Maybe<URL> ResolveExtensions(const URL& search) {
if (options == TRY_EXACT_NAME) {
if (FileExists(search)) {
return Just(search);
}
}
for (const char* extension : EXTENSIONS) {
URL guess(search.path() + extension, &search);
if (FileExists(guess)) {
return Just(guess);
}
}
return Nothing<URL>();
}
inline Maybe<URL> ResolveIndex(const URL& search) {
return ResolveExtensions<ONLY_VIA_EXTENSIONS>(URL("index", search));
}
Maybe<URL> FinalizeResolution(Environment* env,
const URL& resolved,
const URL& base) {
if (env->options()->experimental_specifier_resolution == "node") {
Maybe<URL> file = ResolveExtensions<TRY_EXACT_NAME>(resolved);
if (!file.IsNothing()) {
return file;
}
if (resolved.path().back() != '/') {
file = ResolveIndex(URL(resolved.path() + "/", &base));
} else {
file = ResolveIndex(resolved);
}
if (!file.IsNothing()) {
return file;
}
std::string msg = "Cannot find module " + resolved.path() +
" imported from " + base.ToFilePath();
node::THROW_ERR_MODULE_NOT_FOUND(env, msg.c_str());
return Nothing<URL>();
}
if (resolved.path().back() == '/') {
return Just(resolved);
}
const std::string& path = resolved.ToFilePath();
if (CheckDescriptorAtPath(path) != FILE) {
std::string msg = "Cannot find module " +
(path.length() != 0 ? path : resolved.path()) +
" imported from " + base.ToFilePath();
node::THROW_ERR_MODULE_NOT_FOUND(env, msg.c_str());
return Nothing<URL>();
}
return Just(resolved);
}
void ThrowExportsNotFound(Environment* env,
const std::string& subpath,
const URL& pjson_url,
const URL& base) {
const std::string msg = "Package subpath '" + subpath + "' is not defined" +
" by \"exports\" in " + pjson_url.ToFilePath() + " imported from " +
base.ToFilePath();
node::THROW_ERR_PACKAGE_PATH_NOT_EXPORTED(env, msg.c_str());
}
void ThrowSubpathInvalid(Environment* env,
const std::string& subpath,
const URL& pjson_url,
const URL& base) {
const std::string msg = "Package subpath '" + subpath + "' is not a valid " +
"module request for the \"exports\" resolution of " +
pjson_url.ToFilePath() + " imported from " + base.ToFilePath();
node::THROW_ERR_INVALID_MODULE_SPECIFIER(env, msg.c_str());
}
void ThrowExportsInvalid(Environment* env,
const std::string& subpath,
const std::string& target,
const URL& pjson_url,
const URL& base) {
if (subpath.length()) {
const std::string msg = "Invalid \"exports\" target \"" + target +
"\" defined for '" + subpath + "' in the package config " +
pjson_url.ToFilePath() + " imported from " + base.ToFilePath();
node::THROW_ERR_INVALID_PACKAGE_TARGET(env, msg.c_str());
} else {
const std::string msg = "Invalid \"exports\" main target " + target +
" defined in the package config " + pjson_url.ToFilePath() +
" imported from " + base.ToFilePath();
node::THROW_ERR_INVALID_PACKAGE_TARGET(env, msg.c_str());
}
}
void ThrowExportsInvalid(Environment* env,
const std::string& subpath,
Local<Value> target,
const URL& pjson_url,
const URL& base) {
Local<String> target_string;
if (target->IsObject()) {
if (!v8::JSON::Stringify(env->context(), target.As<Object>(),
v8::String::Empty(env->isolate())).ToLocal(&target_string))
return;
} else {
if (!target->ToString(env->context()).ToLocal(&target_string))
return;
}
Utf8Value target_utf8(env->isolate(), target_string);
std::string target_str(*target_utf8, target_utf8.length());
if (target->IsArray()) {
target_str = '[' + target_str + ']';
}
ThrowExportsInvalid(env, subpath, target_str, pjson_url, base);
}
Maybe<URL> ResolveExportsTargetString(Environment* env,
const std::string& target,
const std::string& subpath,
const std::string& match,
const URL& pjson_url,
const URL& base) {
if (target.substr(0, 2) != "./") {
ThrowExportsInvalid(env, match, target, pjson_url, base);
return Nothing<URL>();
}
if (subpath.length() > 0 && target.back() != '/') {
ThrowExportsInvalid(env, match, target, pjson_url, base);
return Nothing<URL>();
}
URL resolved(target, pjson_url);
std::string resolved_path = resolved.path();
std::string pkg_path = URL(".", pjson_url).path();
if (resolved_path.find(pkg_path) != 0 ||
resolved_path.find("/node_modules/", pkg_path.length() - 1) !=
std::string::npos) {
ThrowExportsInvalid(env, match, target, pjson_url, base);
return Nothing<URL>();
}
if (subpath.length() == 0) return Just(resolved);
URL subpath_resolved(subpath, resolved);
std::string subpath_resolved_path = subpath_resolved.path();
if (subpath_resolved_path.find(resolved_path) != 0 ||
subpath_resolved_path.find("/node_modules/", pkg_path.length() - 1)
!= std::string::npos) {
ThrowSubpathInvalid(env, match + subpath, pjson_url, base);
return Nothing<URL>();
}
return Just(subpath_resolved);
}
bool IsArrayIndex(Environment* env, Local<Value> p) {
Local<Context> context = env->context();
Local<String> p_str = p->ToString(context).ToLocalChecked();
double n_dbl = static_cast<double>(p_str->NumberValue(context).FromJust());
Local<Number> n = Number::New(env->isolate(), n_dbl);
Local<String> cmp_str = n->ToString(context).ToLocalChecked();
if (!p_str->Equals(context, cmp_str).FromJust()) {
return false;
}
if (n_dbl == 0 && std::signbit(n_dbl) == false) {
return true;
}
Local<Integer> cmp_integer;
if (!n->ToInteger(context).ToLocal(&cmp_integer)) {
return false;
}
return n_dbl > 0 && n_dbl < (1LL << 32) - 1;
}
Maybe<URL> ResolveExportsTarget(Environment* env,
const URL& pjson_url,
Local<Value> target,
const std::string& subpath,
const std::string& pkg_subpath,
const URL& base) {
Isolate* isolate = env->isolate();
Local<Context> context = env->context();
if (target->IsString()) {
Utf8Value target_utf8(isolate, target.As<String>());
std::string target_str(*target_utf8, target_utf8.length());
Maybe<URL> resolved = ResolveExportsTargetString(env, target_str, subpath,
pkg_subpath, pjson_url, base);
if (resolved.IsNothing()) {
return Nothing<URL>();
}
return FinalizeResolution(env, resolved.FromJust(), base);
} else if (target->IsArray()) {
Local<Array> target_arr = target.As<Array>();
const uint32_t length = target_arr->Length();
if (length == 0) {
ThrowExportsInvalid(env, pkg_subpath, target, pjson_url, base);
return Nothing<URL>();
}
for (uint32_t i = 0; i < length; i++) {
auto target_item = target_arr->Get(context, i).ToLocalChecked();
{
TryCatchScope try_catch(env);