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// Copyright 2017 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/exception_handler.h"
#include "base/check.h"
#include "base/strings/stringprintf.h"
#include "base/supports_user_data.h"
#include "extensions/renderer/bindings/api_binding_util.h"
#include "extensions/renderer/bindings/get_per_context_data.h"
#include "extensions/renderer/bindings/js_runner.h"
#include "gin/converter.h"
#include "gin/handle.h"
#include "gin/per_context_data.h"
#include "gin/wrappable.h"
namespace extensions {
namespace {
struct ExceptionHandlerPerContextData : public base::SupportsUserData::Data {
static constexpr char kPerContextDataKey[] = "extension_exception_handler";
v8::Global<v8::Function> custom_handler;
};
constexpr char ExceptionHandlerPerContextData::kPerContextDataKey[];
// A helper class to wrap an ExceptionHandler WeakPtr in a v8::Value.
class WrappedExceptionHandler : public gin::Wrappable<WrappedExceptionHandler> {
public:
static gin::WrapperInfo kWrapperInfo;
base::WeakPtr<ExceptionHandler> exception_handler;
};
gin::WrapperInfo WrappedExceptionHandler::kWrapperInfo = {
gin::kEmbedderNativeGin};
} // namespace
ExceptionHandler::ExceptionHandler(
const binding::AddConsoleError& add_console_error)
: add_console_error_(add_console_error) {}
ExceptionHandler::~ExceptionHandler() = default;
v8::Local<v8::Value> ExceptionHandler::GetV8Wrapper(v8::Isolate* isolate) {
auto handle = gin::CreateHandle(isolate, new WrappedExceptionHandler);
handle->exception_handler = weak_factory_.GetWeakPtr();
return handle.ToV8();
}
ExceptionHandler* ExceptionHandler::FromV8Wrapper(v8::Isolate* isolate,
v8::Local<v8::Value> value) {
WrappedExceptionHandler* handler;
if (!gin::ConvertFromV8(isolate, value, &handler))
return nullptr;
return handler->exception_handler.get();
}
void ExceptionHandler::HandleException(v8::Local<v8::Context> context,
const std::string& message,
v8::TryCatch* try_catch) {
DCHECK(try_catch->HasCaught());
v8::Isolate* isolate = context->GetIsolate();
v8::HandleScope handle_scope(isolate);
v8::Local<v8::Value> message_value;
{
v8::TryCatch inner_try_catch(isolate);
inner_try_catch.SetVerbose(true);
v8::Local<v8::Value> stack_trace_value;
if (try_catch->StackTrace(context).ToLocal(&stack_trace_value)) {
message_value = stack_trace_value;
} else if (!try_catch->Message().IsEmpty()) {
message_value = try_catch->Message()->Get();
}
}
std::string full_message =
!message_value.IsEmpty()
? base::StringPrintf("%s: %s", message.c_str(),
gin::V8ToString(isolate, message_value).c_str())
: message;
HandleException(context, full_message, try_catch->Exception());
try_catch->Reset(); // Reset() to avoid handling the error more than once.
}
void ExceptionHandler::HandleException(v8::Local<v8::Context> context,
const std::string& full_message,
v8::Local<v8::Value> exception_value) {
v8::Isolate* isolate = context->GetIsolate();
v8::HandleScope handle_scope(isolate);
v8::Local<v8::Function> handler = GetCustomHandler(context);
if (!handler.IsEmpty()) {
v8::Local<v8::Value> arguments[] = {
gin::StringToV8(isolate, full_message), exception_value,
};
// Hopefully, handling an exception doesn't throw an exception - but it's
// possible. Handle this gracefully, and log errors normally.
v8::TryCatch handler_try_catch(isolate);
handler_try_catch.SetVerbose(true);
JSRunner::Get(context)->RunJSFunction(handler, context, arguments);
} else {
add_console_error_.Run(context, full_message);
}
}
void ExceptionHandler::SetHandlerForContext(v8::Local<v8::Context> context,
v8::Local<v8::Function> handler) {
ExceptionHandlerPerContextData* data =
GetPerContextData<ExceptionHandlerPerContextData>(context,
kCreateIfMissing);
DCHECK(data);
data->custom_handler.Reset(context->GetIsolate(), handler);
}
void ExceptionHandler::RunExtensionCallback(
v8::Local<v8::Context> context,
v8::Local<v8::Function> extension_callback,
v8::LocalVector<v8::Value> callback_arguments,
const std::string& message) {
v8::TryCatch try_catch(context->GetIsolate());
// TODO(devlin): JSRunner::RunJSFunction() isn't guaranteed to run
// synchronously, so if JS is suspended at this moment, the `try_catch` here
// is insufficient.
JSRunner::Get(context)->RunJSFunction(extension_callback, context,
callback_arguments);
// Since arbitrary JS has ran, the context may have been invalidated. If it
// was, bail.
if (!binding::IsContextValid(context))
return;
if (try_catch.HasCaught())
HandleException(context, message, &try_catch);
}
v8::Local<v8::Function> ExceptionHandler::GetCustomHandler(
v8::Local<v8::Context> context) {
ExceptionHandlerPerContextData* data =
GetPerContextData<ExceptionHandlerPerContextData>(context,
kDontCreateIfMissing);
return data ? data->custom_handler.Get(context->GetIsolate())
: v8::Local<v8::Function>();
}
} // namespace extensions
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