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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "extensions/renderer/bindings/api_request_handler.h"
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/memory/raw_ptr.h"
#include "base/strings/strcat.h"
#include "base/values.h"
#include "content/public/renderer/v8_value_converter.h"
#include "extensions/renderer/bindings/api_binding_util.h"
#include "extensions/renderer/bindings/api_response_validator.h"
#include "extensions/renderer/bindings/exception_handler.h"
#include "extensions/renderer/bindings/js_runner.h"
#include "gin/arguments.h"
#include "gin/converter.h"
#include "gin/data_object_builder.h"
#include "third_party/blink/public/web/web_blob.h"
namespace extensions {
// Keys used for passing data back through a custom callback;
constexpr const char kErrorKey[] = "error";
constexpr const char kResolverKey[] = "resolver";
constexpr const char kExceptionHandlerKey[] = "exceptionHandler";
// A helper class to adapt base::Value-style response arguments to v8 arguments
// lazily, or simply return v8 arguments directly (depending on which style of
// arguments were used in construction).
class APIRequestHandler::ArgumentAdapter {
public:
ArgumentAdapter(const base::Value::List* base_argumements,
mojom::ExtraResponseDataPtr extra_data);
explicit ArgumentAdapter(const v8::LocalVector<v8::Value>& v8_arguments);
ArgumentAdapter(ArgumentAdapter&) = delete;
ArgumentAdapter& operator=(const ArgumentAdapter&) = delete;
ArgumentAdapter(ArgumentAdapter&&) = default;
ArgumentAdapter& operator=(ArgumentAdapter&&) = default;
~ArgumentAdapter();
const v8::LocalVector<v8::Value>& GetArguments(
v8::Local<v8::Context> context) const;
mojom::ExtraResponseDataPtr TakeExtraData() { return std::move(extra_data_); }
private:
raw_ptr<const base::Value::List> base_arguments_ = nullptr;
mutable std::optional<v8::LocalVector<v8::Value>> v8_arguments_;
mojom::ExtraResponseDataPtr extra_data_ = nullptr;
};
APIRequestHandler::ArgumentAdapter::ArgumentAdapter(
const base::Value::List* base_arguments,
mojom::ExtraResponseDataPtr extra_data)
: base_arguments_(base_arguments), extra_data_(std::move(extra_data)) {}
APIRequestHandler::ArgumentAdapter::ArgumentAdapter(
const v8::LocalVector<v8::Value>& v8_arguments)
: v8_arguments_(v8_arguments) {}
APIRequestHandler::ArgumentAdapter::~ArgumentAdapter() = default;
const v8::LocalVector<v8::Value>&
APIRequestHandler::ArgumentAdapter::GetArguments(
v8::Local<v8::Context> context) const {
v8::Isolate* isolate = context->GetIsolate();
DCHECK(isolate->GetCurrentContext() == context);
if (base_arguments_) {
DCHECK(!v8_arguments_.has_value())
<< "GetArguments() should only be called once.";
std::unique_ptr<content::V8ValueConverter> converter =
content::V8ValueConverter::Create();
v8_arguments_.emplace(isolate);
v8_arguments_->reserve(base_arguments_->size());
for (const auto& arg : *base_arguments_) {
v8_arguments_->push_back(converter->ToV8Value(arg, context));
}
}
DCHECK(v8_arguments_.has_value());
return v8_arguments_.value();
}
// A helper class to handler delivering the results of an API call to a handler,
// which can be either a callback or a promise.
// TODO(devlin): The overlap in this class for handling a promise vs a callback
// is pretty minimal, leading to a lot of if/else branching. This might be
// cleaner with separate versions for the two cases.
class APIRequestHandler::AsyncResultHandler {
public:
// A callback-based result handler.
AsyncResultHandler(v8::Isolate* isolate,
v8::Local<v8::Function> callback,
v8::Local<v8::Function> custom_callback,
binding::ResultModifierFunction result_modifier,
ExceptionHandler* exception_handler);
// A promise-based result handler.
AsyncResultHandler(v8::Isolate* isolate,
v8::Local<v8::Promise::Resolver> promise_resolver,
v8::Local<v8::Function> custom_callback,
binding::ResultModifierFunction result_modifier);
AsyncResultHandler(const AsyncResultHandler&) = delete;
AsyncResultHandler& operator=(const AsyncResultHandler&) = delete;
~AsyncResultHandler();
// Resolve the request.
// - Sets last error, if it's not promise-based.
// - If the request had a custom callback, this calls the custom callback,
// with a handle to then resolve the extension's callback or promise.
// - Else, invokes the extension's callback or resolves the promise
// immediately.
void ResolveRequest(v8::Local<v8::Context> context,
APILastError* last_error,
const v8::LocalVector<v8::Value>& response_args,
const std::string& error,
mojom::ExtraResponseDataPtr extra_data);
// Returns true if the request handler is using a custom callback.
bool has_custom_callback() const { return !custom_callback_.IsEmpty(); }
private:
// Delivers the result to the promise resolver.
static void ResolvePromise(v8::Local<v8::Context> context,
const v8::LocalVector<v8::Value>& response_args,
const std::string& error,
v8::Local<v8::Promise::Resolver> resolver);
// Delivers the result to the callback provided by the extension.
static void CallExtensionCallback(v8::Local<v8::Context> context,
v8::LocalVector<v8::Value> response_args,
v8::Local<v8::Function> extension_callback,
ExceptionHandler* exception_handler);
// Helper function to handle the result after the bindings' custom callback
// has completed.
static void CustomCallbackAdaptor(
const v8::FunctionCallbackInfo<v8::Value>& info);
// Delivers the result to the custom callback.
void CallCustomCallback(v8::Local<v8::Context> context,
const v8::LocalVector<v8::Value>& response_args,
const std::string& error);
// The type of asynchronous response this handler is for.
const binding::AsyncResponseType async_type_;
// Callback-based handlers. Mutually exclusive with promise-based handlers.
v8::Global<v8::Function> extension_callback_;
// Promise-based handlers. Mutually exclusive with callback-based handlers.
v8::Global<v8::Promise::Resolver> promise_resolver_;
// The ExceptionHandler used to catch any exceptions thrown when handling the
// extension's callback. Only non-null for callback-based requests.
// This is guaranteed to be valid while the AsyncResultHandler is valid
// because the ExceptionHandler lives for the duration of the bindings
// system, similar to the APIRequestHandler (which owns this).
raw_ptr<ExceptionHandler> exception_handler_ = nullptr;
// Custom callback handlers.
v8::Global<v8::Function> custom_callback_;
// A OnceCallback that can be used to modify the return arguments.
binding::ResultModifierFunction result_modifier_;
};
APIRequestHandler::AsyncResultHandler::AsyncResultHandler(
v8::Isolate* isolate,
v8::Local<v8::Function> extension_callback,
v8::Local<v8::Function> custom_callback,
binding::ResultModifierFunction result_modifier,
ExceptionHandler* exception_handler)
: async_type_(binding::AsyncResponseType::kCallback),
exception_handler_(exception_handler),
result_modifier_(std::move(result_modifier)) {
DCHECK(!extension_callback.IsEmpty() || !custom_callback.IsEmpty());
DCHECK(exception_handler_);
if (!extension_callback.IsEmpty()) {
extension_callback_.Reset(isolate, extension_callback);
}
if (!custom_callback.IsEmpty()) {
custom_callback_.Reset(isolate, custom_callback);
}
}
APIRequestHandler::AsyncResultHandler::AsyncResultHandler(
v8::Isolate* isolate,
v8::Local<v8::Promise::Resolver> promise_resolver,
v8::Local<v8::Function> custom_callback,
binding::ResultModifierFunction result_modifier)
: async_type_(binding::AsyncResponseType::kPromise),
result_modifier_(std::move(result_modifier)) {
// NOTE(devlin): We'll need to handle an empty promise resolver if
// v8::Promise::Resolver::New() isn't guaranteed.
DCHECK(!promise_resolver.IsEmpty());
promise_resolver_.Reset(isolate, promise_resolver);
if (!custom_callback.IsEmpty()) {
custom_callback_.Reset(isolate, custom_callback);
}
}
APIRequestHandler::AsyncResultHandler::~AsyncResultHandler() = default;
void APIRequestHandler::AsyncResultHandler::ResolveRequest(
v8::Local<v8::Context> context,
APILastError* last_error,
const v8::LocalVector<v8::Value>& response_args,
const std::string& error,
mojom::ExtraResponseDataPtr extra_data) {
v8::Isolate* isolate = context->GetIsolate();
// Set runtime.lastError if there is an error and this isn't a promise-based
// request (promise-based requests instead reject to indicate failure).
bool set_last_error = promise_resolver_.IsEmpty() && !error.empty();
if (set_last_error) {
last_error->SetError(context, error);
}
// If there is a result modifier for this async request and the response args
// are not empty, run the result modifier and allow it to massage the return
// arguments before we send them back.
// Note: a request can end up with a result modifier and be returning an empty
// set of args if we are responding that an error occurred.
v8::LocalVector<v8::Value> args =
result_modifier_.is_null() || response_args.empty()
? response_args
: std::move(result_modifier_)
.Run(response_args, context, async_type_);
if (has_custom_callback()) {
// Blobs that are part of the response are passed in as an extra parameter
// to the custom callback. The custom callback can then incorporate these
// blobs appropriately in its response.
if (extra_data) {
v8::LocalVector<v8::Value> v8_blobs(isolate);
for (auto& blob : extra_data->blobs) {
auto web_blob =
blink::WebBlob::CreateFromSerializedBlob(std::move(blob));
v8_blobs.push_back(web_blob.ToV8Value(context->GetIsolate()));
}
auto blobs = v8::Array::New(context->GetIsolate(), v8_blobs.data(),
v8_blobs.size());
args.push_back(std::move(blobs));
}
// Custom callback case; the custom callback will invoke a curried-in
// callback, which will trigger the response in the extension (either
// promise or callback).
CallCustomCallback(context, args, error);
} else if (!promise_resolver_.IsEmpty()) { // Promise-based request.
DCHECK(extension_callback_.IsEmpty());
ResolvePromise(context, args, error, promise_resolver_.Get(isolate));
} else { // Callback-based request.
DCHECK(!extension_callback_.IsEmpty());
DCHECK(exception_handler_);
CallExtensionCallback(context, std::move(args),
extension_callback_.Get(isolate), exception_handler_);
}
// Since arbitrary JS was run the context might have been invalidated, so only
// clear last error if the context is still valid.
if (set_last_error && binding::IsContextValid(context)) {
last_error->ClearError(context, true);
}
}
// static
void APIRequestHandler::AsyncResultHandler::ResolvePromise(
v8::Local<v8::Context> context,
const v8::LocalVector<v8::Value>& response_args,
const std::string& error,
v8::Local<v8::Promise::Resolver> resolver) {
DCHECK_LE(response_args.size(), 1u);
v8::Isolate* isolate = context->GetIsolate();
v8::MicrotasksScope microtasks_scope(
isolate, context->GetMicrotaskQueue(),
v8::MicrotasksScope::kDoNotRunMicrotasks);
if (error.empty()) {
v8::Local<v8::Value> result;
if (!response_args.empty()) {
result = response_args[0];
} else {
result = v8::Undefined(isolate);
}
v8::Maybe<bool> promise_result = resolver->Resolve(context, result);
// TODO(devlin): It's potentially possible that this could throw if V8
// is terminating on a worker thread; however, it's unclear what happens in
// that scenario (we may appropriately shutdown the thread, or any future
// access of v8 may cause crashes). Make this a CHECK() to flush out any
// situations in which this is a concern. If there are no crashes after
// some time, we may be able to downgrade this.
CHECK(promise_result.IsJust());
} else {
v8::Local<v8::Value> v8_error =
v8::Exception::Error(gin::StringToV8(isolate, error));
v8::Maybe<bool> promise_result = resolver->Reject(context, v8_error);
// See comment above.
CHECK(promise_result.IsJust());
}
}
// static
void APIRequestHandler::AsyncResultHandler::CallExtensionCallback(
v8::Local<v8::Context> context,
v8::LocalVector<v8::Value> args,
v8::Local<v8::Function> extension_callback,
ExceptionHandler* exception_handler) {
DCHECK(exception_handler);
// TODO(devlin): Integrate the API method name in the error message. This
// will require currying it around a bit more.
exception_handler->RunExtensionCallback(
context, extension_callback, std::move(args), "Error handling response");
}
// static
void APIRequestHandler::AsyncResultHandler::CustomCallbackAdaptor(
const v8::FunctionCallbackInfo<v8::Value>& info) {
gin::Arguments arguments(info);
v8::Isolate* isolate = arguments.isolate();
v8::HandleScope handle_scope(isolate);
v8::Local<v8::Context> context = isolate->GetCurrentContext();
v8::Local<v8::Object> data = info.Data().As<v8::Object>();
v8::Local<v8::Value> resolver =
data->Get(context, gin::StringToSymbol(isolate, kResolverKey))
.ToLocalChecked();
if (resolver->IsFunction()) {
v8::Local<v8::Value> exception_handler_value =
data->Get(context, gin::StringToSymbol(isolate, kExceptionHandlerKey))
.ToLocalChecked();
ExceptionHandler* exception_handler =
ExceptionHandler::FromV8Wrapper(isolate, exception_handler_value);
// `exception_handler` could be null if the context were invalidated.
// Since this can be invoked arbitrarily from running JS, we need to
// handle this case gracefully.
if (!exception_handler) {
return;
}
CallExtensionCallback(context, arguments.GetAll(),
resolver.As<v8::Function>(), exception_handler);
} else {
v8::Local<v8::Value> error_value =
data->Get(context, gin::StringToSymbol(isolate, kErrorKey))
.ToLocalChecked();
const std::string error = gin::V8ToString(isolate, error_value);
CHECK(resolver->IsPromise());
ResolvePromise(context, arguments.GetAll(), error,
resolver.As<v8::Promise::Resolver>());
}
}
void APIRequestHandler::AsyncResultHandler::CallCustomCallback(
v8::Local<v8::Context> context,
const v8::LocalVector<v8::Value>& response_args,
const std::string& error) {
v8::Isolate* isolate = context->GetIsolate();
v8::Local<v8::Value> callback_to_pass = v8::Undefined(isolate);
if (!extension_callback_.IsEmpty() || !promise_resolver_.IsEmpty()) {
gin::DataObjectBuilder data_builder(isolate);
v8::Local<v8::Value> resolver_value;
if (!promise_resolver_.IsEmpty()) {
resolver_value = promise_resolver_.Get(isolate);
} else {
DCHECK(exception_handler_);
resolver_value = extension_callback_.Get(isolate);
data_builder.Set(kExceptionHandlerKey,
exception_handler_->GetV8Wrapper(isolate));
}
v8::Local<v8::Object> data = data_builder.Set(kResolverKey, resolver_value)
.Set(kErrorKey, error)
.Build();
// Rather than passing the original callback, we create a function which
// calls back to an adpator which will invoke the original callback or
// resolve the promises, depending on the type of request that was made to
// the API.
callback_to_pass = v8::Function::New(context, &CustomCallbackAdaptor, data)
.ToLocalChecked();
}
// Custom callbacks in the JS bindings are called with the arguments of the
// callback function and the response from the API.
v8::LocalVector<v8::Value> custom_callback_args(isolate);
custom_callback_args.reserve(1 + response_args.size());
custom_callback_args.push_back(callback_to_pass);
custom_callback_args.insert(custom_callback_args.end(), response_args.begin(),
response_args.end());
JSRunner::Get(context)->RunJSFunction(custom_callback_.Get(isolate), context,
custom_callback_args);
}
APIRequestHandler::Request::Request() = default;
APIRequestHandler::Request::~Request() = default;
APIRequestHandler::RequestDetails::RequestDetails(
int request_id,
v8::Local<v8::Promise> promise)
: request_id(request_id), promise(promise) {}
APIRequestHandler::RequestDetails::~RequestDetails() = default;
APIRequestHandler::RequestDetails::RequestDetails(const RequestDetails& other) =
default;
APIRequestHandler::PendingRequest::PendingRequest(
v8::Isolate* isolate,
v8::Local<v8::Context> context,
const std::string& method_name,
std::unique_ptr<AsyncResultHandler> async_handler,
std::unique_ptr<InteractionProvider::Token> gesture_token)
: isolate(isolate),
context(isolate, context),
method_name(method_name),
async_handler(std::move(async_handler)) {
// Only curry the user gesture through if there's something to handle the
// response.
if (this->async_handler) {
user_gesture_token = std::move(gesture_token);
}
}
APIRequestHandler::PendingRequest::~PendingRequest() = default;
APIRequestHandler::PendingRequest::PendingRequest(PendingRequest&&) = default;
APIRequestHandler::PendingRequest& APIRequestHandler::PendingRequest::operator=(
PendingRequest&&) = default;
APIRequestHandler::APIRequestHandler(
SendRequestMethod send_request,
APILastError last_error,
ExceptionHandler* exception_handler,
const InteractionProvider* interaction_provider)
: send_request_(std::move(send_request)),
last_error_(std::move(last_error)),
exception_handler_(exception_handler),
interaction_provider_(interaction_provider) {}
APIRequestHandler::~APIRequestHandler() = default;
v8::Local<v8::Promise> APIRequestHandler::StartRequest(
v8::Local<v8::Context> context,
const std::string& method,
base::Value::List arguments_list,
binding::AsyncResponseType async_type,
v8::Local<v8::Function> callback,
v8::Local<v8::Function> custom_callback,
binding::ResultModifierFunction result_modifier) {
v8::Isolate* isolate = context->GetIsolate();
v8::Local<v8::Promise> promise;
std::unique_ptr<AsyncResultHandler> async_handler =
GetAsyncResultHandler(context, async_type, callback, custom_callback,
std::move(result_modifier), &promise);
DCHECK_EQ(async_type == binding::AsyncResponseType::kPromise,
!promise.IsEmpty());
int request_id = GetNextRequestId();
auto request = std::make_unique<Request>();
request->request_id = request_id;
std::unique_ptr<InteractionProvider::Token> user_gesture_token;
if (async_handler) {
user_gesture_token = interaction_provider_->GetCurrentToken(context);
request->has_async_response_handler = true;
}
pending_requests_.emplace(
request_id,
PendingRequest(isolate, context, method, std::move(async_handler),
std::move(user_gesture_token)));
request->has_user_gesture =
interaction_provider_->HasActiveInteraction(context);
request->arguments_list = std::move(arguments_list);
request->method_name = method;
last_sent_request_id_ = request_id;
send_request_.Run(std::move(request), context);
return promise;
}
void APIRequestHandler::CompleteRequest(
int request_id,
const base::Value::List& response_args,
const std::string& error,
mojom::ExtraResponseDataPtr extra_data) {
CompleteRequestImpl(request_id,
ArgumentAdapter(&response_args, std::move(extra_data)),
error);
}
void APIRequestHandler::CompleteRequest(
int request_id,
const v8::LocalVector<v8::Value>& response_args,
const std::string& error) {
CompleteRequestImpl(request_id, ArgumentAdapter(response_args), error);
}
APIRequestHandler::RequestDetails APIRequestHandler::AddPendingRequest(
v8::Local<v8::Context> context,
binding::AsyncResponseType async_type,
v8::Local<v8::Function> callback,
binding::ResultModifierFunction result_modifier) {
v8::Isolate* isolate = context->GetIsolate();
v8::Local<v8::Promise> promise;
std::unique_ptr<AsyncResultHandler> async_handler = GetAsyncResultHandler(
context, async_type, callback, v8::Local<v8::Function>(),
std::move(result_modifier), &promise);
DCHECK_EQ(async_type == binding::AsyncResponseType::kPromise,
!promise.IsEmpty());
int request_id = GetNextRequestId();
// NOTE(devlin): We ignore the UserGestureToken for synthesized requests like
// these that aren't sent to the browser. It is the caller's responsibility to
// handle any user gesture behavior. This prevents an issue where messaging
// handling would create an extra scoped user gesture, causing issues. See
// https://crbug.com/921141.
std::unique_ptr<InteractionProvider::Token> null_user_gesture_token;
pending_requests_.emplace(
request_id,
PendingRequest(isolate, context, std::string(), std::move(async_handler),
std::move(null_user_gesture_token)));
return RequestDetails(request_id, promise);
}
void APIRequestHandler::InvalidateContext(v8::Local<v8::Context> context) {
for (auto iter = pending_requests_.begin();
iter != pending_requests_.end();) {
if (iter->second.context == context) {
iter = pending_requests_.erase(iter);
} else {
++iter;
}
}
}
void APIRequestHandler::SetResponseValidator(
std::unique_ptr<APIResponseValidator> response_validator) {
DCHECK(!response_validator_);
response_validator_ = std::move(response_validator);
}
std::set<int> APIRequestHandler::GetPendingRequestIdsForTesting() const {
std::set<int> result;
for (const auto& pair : pending_requests_) {
result.insert(pair.first);
}
return result;
}
int APIRequestHandler::GetNextRequestId() {
// The request id is primarily used in the renderer to associate an API
// request with the associated callback, but it's also used in the browser as
// an identifier for the extension function (e.g. by the pageCapture API).
// TODO(devlin): We should probably fix this, since the request id is only
// unique per-isolate, rather than globally.
// TODO(devlin): We could *probably* get away with just using an integer
// here, but it's a little less foolproof. How slow is GenerateGUID? Should
// we use that instead? It means updating the IPC
// (ExtensionHostMsg_Request).
// base::UnguessableToken is another good option.
return next_request_id_++;
}
std::unique_ptr<APIRequestHandler::AsyncResultHandler>
APIRequestHandler::GetAsyncResultHandler(
v8::Local<v8::Context> context,
binding::AsyncResponseType async_type,
v8::Local<v8::Function> extension_callback,
v8::Local<v8::Function> custom_callback,
binding::ResultModifierFunction result_modifier,
v8::Local<v8::Promise>* promise_out) {
v8::Isolate* isolate = context->GetIsolate();
std::unique_ptr<AsyncResultHandler> async_handler;
if (async_type == binding::AsyncResponseType::kPromise) {
DCHECK(extension_callback.IsEmpty())
<< "Promise based requests should never be "
"started with a callback being passed in.";
v8::Local<v8::Promise::Resolver> resolver =
v8::Promise::Resolver::New(context).ToLocalChecked();
async_handler = std::make_unique<AsyncResultHandler>(
isolate, resolver, custom_callback, std::move(result_modifier));
*promise_out = resolver->GetPromise();
} else if (!custom_callback.IsEmpty() || !extension_callback.IsEmpty()) {
async_handler = std::make_unique<AsyncResultHandler>(
isolate, extension_callback, custom_callback,
std::move(result_modifier), exception_handler_);
}
return async_handler;
}
void APIRequestHandler::CompleteRequestImpl(int request_id,
ArgumentAdapter arguments,
const std::string& error) {
auto iter = pending_requests_.find(request_id);
// The request may have been removed if the context was invalidated before a
// response is ready.
if (iter == pending_requests_.end()) {
return;
}
PendingRequest pending_request = std::move(iter->second);
pending_requests_.erase(iter);
v8::Isolate* isolate = pending_request.isolate;
v8::HandleScope handle_scope(isolate);
v8::Local<v8::Context> context = pending_request.context.Get(isolate);
v8::Context::Scope context_scope(context);
if (!pending_request.async_handler) {
// If there's no async handler associated with the request, but there is an
// error, report the error as if it were unchecked.
if (!error.empty()) {
// TODO(devlin): Use pending_requeset.method_name here?
last_error_.ReportUncheckedError(context, error);
}
// No async handler to trigger, so we're done!
return;
}
const v8::LocalVector<v8::Value>& response_args =
arguments.GetArguments(context);
std::unique_ptr<InteractionProvider::Scope> user_gesture;
if (pending_request.user_gesture_token) {
user_gesture = interaction_provider_->CreateScopedInteraction(
context, std::move(pending_request.user_gesture_token));
}
if (response_validator_) {
bool has_custom_callback =
pending_request.async_handler->has_custom_callback();
response_validator_->ValidateResponse(
context, pending_request.method_name, response_args, error,
has_custom_callback
? APIResponseValidator::CallbackType::kAPIProvided
: APIResponseValidator::CallbackType::kCallerProvided);
}
v8::TryCatch try_catch(isolate);
pending_request.async_handler->ResolveRequest(
context, &last_error_, response_args, error, arguments.TakeExtraData());
// Since arbitrary JS has ran, the context may have been invalidated. If it
// was, bail.
if (!binding::IsContextValid(context)) {
return;
}
if (try_catch.HasCaught()) {
exception_handler_->HandleException(context, "Error handling response",
&try_catch);
}
}
} // namespace extensions
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