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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 "third_party/blink/renderer/platform/bindings/callback_function_base.h"
#include "third_party/blink/renderer/platform/bindings/binding_security_for_platform.h"
#include "third_party/blink/renderer/platform/bindings/exception_messages.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/scheduler/public/task_attribution_info.h"
#include "third_party/blink/renderer/platform/scheduler/public/task_attribution_tracker.h"
namespace blink {
CallbackFunctionBase::CallbackFunctionBase(
v8::Local<v8::Object> callback_function) {
DCHECK(!callback_function.IsEmpty());
v8::Isolate* isolate = callback_function->GetIsolate();
callback_function_.Reset(isolate, callback_function);
incumbent_script_state_ =
ScriptState::From(isolate, isolate->GetIncumbentContext());
// Set |callback_relevant_script_state_| iff the creation context and the
// incumbent context are the same origin-domain. Otherwise, leave it as
// nullptr.
if (callback_function->IsFunction()) {
// If the callback object is a function, it's guaranteed to be the same
// origin at least, and very likely to be the same origin-domain. Even if
// it's not the same origin-domain, it's already been possible for the
// callsite to run arbitrary script in the context. No need to protect it.
// This is an optimization faster than ShouldAllowAccessToV8Context below.
callback_relevant_script_state_ =
ScriptState::ForRelevantRealm(isolate, callback_function);
} else {
v8::MaybeLocal<v8::Context> creation_context =
callback_function->GetCreationContext();
if (BindingSecurityForPlatform::ShouldAllowAccessToV8Context(
incumbent_script_state_->GetContext(), creation_context)) {
callback_relevant_script_state_ =
ScriptState::From(isolate, creation_context.ToLocalChecked());
}
}
}
void CallbackFunctionBase::Trace(Visitor* visitor) const {
visitor->Trace(callback_function_);
visitor->Trace(callback_relevant_script_state_);
visitor->Trace(incumbent_script_state_);
}
ScriptState* CallbackFunctionBase::CallbackRelevantScriptStateOrReportError(
const char* interface_name,
const char* operation_name) const {
if (callback_relevant_script_state_) [[likely]] {
return callback_relevant_script_state_;
}
// Report a SecurityError due to a cross origin callback object.
ScriptState::Scope incumbent_scope(incumbent_script_state_);
v8::TryCatch try_catch(GetIsolate());
try_catch.SetVerbose(true);
ExceptionState exception_state(GetIsolate());
exception_state.ThrowSecurityError(ExceptionMessages::FailedToExecute(
operation_name, interface_name,
"An invocation of the provided callback failed due to cross origin "
"access."));
return nullptr;
}
ScriptState* CallbackFunctionBase::CallbackRelevantScriptStateOrThrowException(
const char* interface_name,
const char* operation_name) const {
if (callback_relevant_script_state_) [[likely]] {
return callback_relevant_script_state_;
}
// Throw a SecurityError due to a cross origin callback object.
ScriptState::Scope incumbent_scope(incumbent_script_state_);
ExceptionState exception_state(GetIsolate());
exception_state.ThrowSecurityError(ExceptionMessages::FailedToExecute(
operation_name, interface_name,
"An invocation of the provided callback failed due to cross origin "
"access."));
return nullptr;
}
void CallbackFunctionBase::EvaluateAsPartOfCallback(
base::OnceCallback<void(ScriptState*)> closure) {
if (!callback_relevant_script_state_) [[unlikely]] {
return;
}
// https://webidl.spec.whatwg.org/#es-invoking-callback-functions
// step 8: Prepare to run script with relevant settings.
ScriptState::Scope callback_relevant_context_scope(
callback_relevant_script_state_);
// step 9: Prepare to run a callback with stored settings.
v8::Context::BackupIncumbentScope backup_incumbent_scope(
IncumbentScriptState()->GetContext());
std::move(closure).Run(callback_relevant_script_state_);
}
void CallbackFunctionWithTaskAttributionBase::Trace(Visitor* visitor) const {
CallbackFunctionBase::Trace(visitor);
visitor->Trace(task_state_);
}
} // namespace blink
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