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#include "node_errors.h"
#include "node_process.h"
#include "util.h"
#ifdef __APPLE__
#include <crt_externs.h>
#define environ (*_NSGetEnviron())
#elif !defined(_MSC_VER)
extern char** environ;
#endif
namespace node {
using v8::Array;
using v8::Boolean;
using v8::Context;
using v8::EscapableHandleScope;
using v8::HandleScope;
using v8::Integer;
using v8::Isolate;
using v8::Just;
using v8::Local;
using v8::Maybe;
using v8::MaybeLocal;
using v8::Name;
using v8::NamedPropertyHandlerConfiguration;
using v8::NewStringType;
using v8::Nothing;
using v8::Object;
using v8::ObjectTemplate;
using v8::PropertyCallbackInfo;
using v8::String;
using v8::Value;
class RealEnvStore final : public KVStore {
public:
Local<String> Get(Isolate* isolate, Local<String> key) const override;
void Set(Isolate* isolate, Local<String> key, Local<String> value) override;
int32_t Query(Isolate* isolate, Local<String> key) const override;
void Delete(Isolate* isolate, Local<String> key) override;
Local<Array> Enumerate(Isolate* isolate) const override;
};
class MapKVStore final : public KVStore {
public:
Local<String> Get(Isolate* isolate, Local<String> key) const override;
void Set(Isolate* isolate, Local<String> key, Local<String> value) override;
int32_t Query(Isolate* isolate, Local<String> key) const override;
void Delete(Isolate* isolate, Local<String> key) override;
Local<Array> Enumerate(Isolate* isolate) const override;
std::shared_ptr<KVStore> Clone(Isolate* isolate) const override;
MapKVStore() = default;
MapKVStore(const MapKVStore& other) : map_(other.map_) {}
private:
mutable Mutex mutex_;
std::unordered_map<std::string, std::string> map_;
};
namespace per_process {
Mutex env_var_mutex;
std::shared_ptr<KVStore> system_environment = std::make_shared<RealEnvStore>();
} // namespace per_process
Local<String> RealEnvStore::Get(Isolate* isolate,
Local<String> property) const {
Mutex::ScopedLock lock(per_process::env_var_mutex);
#ifdef __POSIX__
node::Utf8Value key(isolate, property);
const char* val = getenv(*key);
if (val) {
return String::NewFromUtf8(isolate, val, NewStringType::kNormal)
.ToLocalChecked();
}
#else // _WIN32
node::TwoByteValue key(isolate, property);
WCHAR buffer[32767]; // The maximum size allowed for environment variables.
SetLastError(ERROR_SUCCESS);
DWORD result = GetEnvironmentVariableW(
reinterpret_cast<WCHAR*>(*key), buffer, arraysize(buffer));
// If result >= sizeof buffer the buffer was too small. That should never
// happen. If result == 0 and result != ERROR_SUCCESS the variable was not
// found.
if ((result > 0 || GetLastError() == ERROR_SUCCESS) &&
result < arraysize(buffer)) {
const uint16_t* two_byte_buffer = reinterpret_cast<const uint16_t*>(buffer);
v8::MaybeLocal<String> rc = String::NewFromTwoByte(
isolate, two_byte_buffer, NewStringType::kNormal);
if (rc.IsEmpty()) {
isolate->ThrowException(ERR_STRING_TOO_LONG(isolate));
return Local<String>();
}
return rc.ToLocalChecked();
}
#endif
return Local<String>();
}
void RealEnvStore::Set(Isolate* isolate,
Local<String> property,
Local<String> value) {
Mutex::ScopedLock lock(per_process::env_var_mutex);
#ifdef __POSIX__
node::Utf8Value key(isolate, property);
node::Utf8Value val(isolate, value);
setenv(*key, *val, 1);
#else // _WIN32
node::TwoByteValue key(isolate, property);
node::TwoByteValue val(isolate, value);
WCHAR* key_ptr = reinterpret_cast<WCHAR*>(*key);
// Environment variables that start with '=' are read-only.
if (key_ptr[0] != L'=') {
SetEnvironmentVariableW(key_ptr, reinterpret_cast<WCHAR*>(*val));
}
#endif
}
int32_t RealEnvStore::Query(Isolate* isolate, Local<String> property) const {
Mutex::ScopedLock lock(per_process::env_var_mutex);
#ifdef __POSIX__
node::Utf8Value key(isolate, property);
if (getenv(*key)) return 0;
#else // _WIN32
node::TwoByteValue key(isolate, property);
WCHAR* key_ptr = reinterpret_cast<WCHAR*>(*key);
SetLastError(ERROR_SUCCESS);
if (GetEnvironmentVariableW(key_ptr, nullptr, 0) > 0 ||
GetLastError() == ERROR_SUCCESS) {
if (key_ptr[0] == L'=') {
// Environment variables that start with '=' are hidden and read-only.
return static_cast<int32_t>(v8::ReadOnly) |
static_cast<int32_t>(v8::DontDelete) |
static_cast<int32_t>(v8::DontEnum);
}
return 0;
}
#endif
return -1;
}
void RealEnvStore::Delete(Isolate* isolate, Local<String> property) {
Mutex::ScopedLock lock(per_process::env_var_mutex);
#ifdef __POSIX__
node::Utf8Value key(isolate, property);
unsetenv(*key);
#else
node::TwoByteValue key(isolate, property);
WCHAR* key_ptr = reinterpret_cast<WCHAR*>(*key);
SetEnvironmentVariableW(key_ptr, nullptr);
#endif
}
Local<Array> RealEnvStore::Enumerate(Isolate* isolate) const {
Mutex::ScopedLock lock(per_process::env_var_mutex);
#ifdef __POSIX__
int env_size = 0;
while (environ[env_size]) {
env_size++;
}
std::vector<Local<Value>> env_v(env_size);
for (int i = 0; i < env_size; ++i) {
const char* var = environ[i];
const char* s = strchr(var, '=');
const int length = s ? s - var : strlen(var);
env_v[i] = String::NewFromUtf8(isolate, var, NewStringType::kNormal, length)
.ToLocalChecked();
}
#else // _WIN32
std::vector<Local<Value>> env_v;
WCHAR* environment = GetEnvironmentStringsW();
if (environment == nullptr)
return Array::New(isolate); // This should not happen.
WCHAR* p = environment;
while (*p) {
WCHAR* s;
if (*p == L'=') {
// If the key starts with '=' it is a hidden environment variable.
p += wcslen(p) + 1;
continue;
} else {
s = wcschr(p, L'=');
}
if (!s) {
s = p + wcslen(p);
}
const uint16_t* two_byte_buffer = reinterpret_cast<const uint16_t*>(p);
const size_t two_byte_buffer_len = s - p;
v8::MaybeLocal<String> rc = String::NewFromTwoByte(
isolate, two_byte_buffer, NewStringType::kNormal, two_byte_buffer_len);
if (rc.IsEmpty()) {
isolate->ThrowException(ERR_STRING_TOO_LONG(isolate));
FreeEnvironmentStringsW(environment);
return Local<Array>();
}
env_v.push_back(rc.ToLocalChecked());
p = s + wcslen(s) + 1;
}
FreeEnvironmentStringsW(environment);
#endif
return Array::New(isolate, env_v.data(), env_v.size());
}
std::shared_ptr<KVStore> KVStore::Clone(v8::Isolate* isolate) const {
HandleScope handle_scope(isolate);
Local<Context> context = isolate->GetCurrentContext();
std::shared_ptr<KVStore> copy = KVStore::CreateMapKVStore();
Local<Array> keys = Enumerate(isolate);
uint32_t keys_length = keys->Length();
for (uint32_t i = 0; i < keys_length; i++) {
Local<Value> key = keys->Get(context, i).ToLocalChecked();
CHECK(key->IsString());
copy->Set(isolate, key.As<String>(), Get(isolate, key.As<String>()));
}
return copy;
}
Local<String> MapKVStore::Get(Isolate* isolate, Local<String> key) const {
Mutex::ScopedLock lock(mutex_);
Utf8Value str(isolate, key);
auto it = map_.find(std::string(*str, str.length()));
if (it == map_.end()) return Local<String>();
return String::NewFromUtf8(isolate, it->second.data(),
NewStringType::kNormal, it->second.size())
.ToLocalChecked();
}
void MapKVStore::Set(Isolate* isolate, Local<String> key, Local<String> value) {
Mutex::ScopedLock lock(mutex_);
Utf8Value key_str(isolate, key);
Utf8Value value_str(isolate, value);
if (*key_str != nullptr && *value_str != nullptr) {
map_[std::string(*key_str, key_str.length())] =
std::string(*value_str, value_str.length());
}
}
int32_t MapKVStore::Query(Isolate* isolate, Local<String> key) const {
Mutex::ScopedLock lock(mutex_);
Utf8Value str(isolate, key);
auto it = map_.find(std::string(*str, str.length()));
return it == map_.end() ? -1 : 0;
}
void MapKVStore::Delete(Isolate* isolate, Local<String> key) {
Mutex::ScopedLock lock(mutex_);
Utf8Value str(isolate, key);
map_.erase(std::string(*str, str.length()));
}
Local<Array> MapKVStore::Enumerate(Isolate* isolate) const {
Mutex::ScopedLock lock(mutex_);
std::vector<Local<Value>> values;
values.reserve(map_.size());
for (const auto& pair : map_) {
values.emplace_back(
String::NewFromUtf8(isolate, pair.first.data(),
NewStringType::kNormal, pair.first.size())
.ToLocalChecked());
}
return Array::New(isolate, values.data(), values.size());
}
std::shared_ptr<KVStore> MapKVStore::Clone(Isolate* isolate) const {
return std::make_shared<MapKVStore>(*this);
}
std::shared_ptr<KVStore> KVStore::CreateMapKVStore() {
return std::make_shared<MapKVStore>();
}
Maybe<bool> KVStore::AssignFromObject(Local<Context> context,
Local<Object> entries) {
Isolate* isolate = context->GetIsolate();
HandleScope handle_scope(isolate);
Local<Array> keys;
if (!entries->GetOwnPropertyNames(context).ToLocal(&keys))
return Nothing<bool>();
uint32_t keys_length = keys->Length();
for (uint32_t i = 0; i < keys_length; i++) {
Local<Value> key;
if (!keys->Get(context, i).ToLocal(&key))
return Nothing<bool>();
if (!key->IsString()) continue;
Local<Value> value;
Local<String> value_string;
if (!entries->Get(context, key.As<String>()).ToLocal(&value) ||
!value->ToString(context).ToLocal(&value_string)) {
return Nothing<bool>();
}
Set(isolate, key.As<String>(), value_string);
}
return Just(true);
}
static void EnvGetter(Local<Name> property,
const PropertyCallbackInfo<Value>& info) {
Environment* env = Environment::GetCurrent(info);
if (property->IsSymbol()) {
return info.GetReturnValue().SetUndefined();
}
CHECK(property->IsString());
info.GetReturnValue().Set(
env->env_vars()->Get(env->isolate(), property.As<String>()));
}
static void EnvSetter(Local<Name> property,
Local<Value> value,
const PropertyCallbackInfo<Value>& info) {
Environment* env = Environment::GetCurrent(info);
// calling env->EmitProcessEnvWarning() sets a variable indicating that
// warnings have been emitted. It should be called last after other
// conditions leading to a warning have been met.
if (env->options()->pending_deprecation && !value->IsString() &&
!value->IsNumber() && !value->IsBoolean() &&
env->EmitProcessEnvWarning()) {
if (ProcessEmitDeprecationWarning(
env,
"Assigning any value other than a string, number, or boolean to a "
"process.env property is deprecated. Please make sure to convert "
"the "
"value to a string before setting process.env with it.",
"DEP0104")
.IsNothing())
return;
}
Local<String> key;
Local<String> value_string;
if (!property->ToString(env->context()).ToLocal(&key) ||
!value->ToString(env->context()).ToLocal(&value_string)) {
return;
}
env->env_vars()->Set(env->isolate(), key, value_string);
// Whether it worked or not, always return value.
info.GetReturnValue().Set(value);
}
static void EnvQuery(Local<Name> property,
const PropertyCallbackInfo<Integer>& info) {
Environment* env = Environment::GetCurrent(info);
if (property->IsString()) {
int32_t rc = env->env_vars()->Query(env->isolate(), property.As<String>());
if (rc != -1) info.GetReturnValue().Set(rc);
}
}
static void EnvDeleter(Local<Name> property,
const PropertyCallbackInfo<Boolean>& info) {
Environment* env = Environment::GetCurrent(info);
if (property->IsString()) {
env->env_vars()->Delete(env->isolate(), property.As<String>());
}
// process.env never has non-configurable properties, so always
// return true like the tc39 delete operator.
info.GetReturnValue().Set(true);
}
static void EnvEnumerator(const PropertyCallbackInfo<Array>& info) {
Environment* env = Environment::GetCurrent(info);
info.GetReturnValue().Set(
env->env_vars()->Enumerate(env->isolate()));
}
MaybeLocal<Object> CreateEnvVarProxy(Local<Context> context,
Isolate* isolate,
Local<Object> data) {
EscapableHandleScope scope(isolate);
Local<ObjectTemplate> env_proxy_template = ObjectTemplate::New(isolate);
env_proxy_template->SetHandler(NamedPropertyHandlerConfiguration(
EnvGetter, EnvSetter, EnvQuery, EnvDeleter, EnvEnumerator, data));
return scope.EscapeMaybe(env_proxy_template->NewInstance(context));
}
} // namespace node
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