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// Copyright 2021 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/modules/handwriting/handwriting_recognition_service.h"
#include <utility>
#include "base/notreached.h"
#include "third_party/blink/public/platform/browser_interface_broker_proxy.h"
#include "third_party/blink/public/platform/task_type.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise_resolver.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_handwriting_model_constraint.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_handwriting_recognizer_query_result.h"
#include "third_party/blink/renderer/core/dom/dom_exception.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/modules/handwriting/handwriting_recognizer.h"
#include "third_party/blink/renderer/modules/handwriting/handwriting_type_converters.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
namespace blink {
namespace {
void OnCreateHandwritingRecognizer(
ScriptState* script_state,
ScriptPromiseResolver<HandwritingRecognizer>* resolver,
handwriting::mojom::blink::CreateHandwritingRecognizerResult result,
mojo::PendingRemote<handwriting::mojom::blink::HandwritingRecognizer>
pending_remote) {
switch (result) {
case handwriting::mojom::blink::CreateHandwritingRecognizerResult::kError: {
resolver->Reject(MakeGarbageCollected<DOMException>(
DOMExceptionCode::kUnknownError, "Internal error."));
return;
}
case handwriting::mojom::blink::CreateHandwritingRecognizerResult::
kNotSupported: {
resolver->Reject(MakeGarbageCollected<DOMException>(
DOMExceptionCode::kNotSupportedError,
"The provided model constraints aren't supported."));
return;
}
case handwriting::mojom::blink::CreateHandwritingRecognizerResult::kOk: {
auto* handwriting_recognizer =
MakeGarbageCollected<HandwritingRecognizer>(
ExecutionContext::From(script_state), std::move(pending_remote));
resolver->Resolve(handwriting_recognizer);
return;
}
}
NOTREACHED() << "CreateHandwritingRecognizer returns an invalid result.";
}
void OnQueryHandwritingRecognizer(
ScriptState* script_state,
ScriptPromiseResolver<IDLNullable<HandwritingRecognizerQueryResult>>*
resolver,
handwriting::mojom::blink::QueryHandwritingRecognizerResultPtr
query_result) {
auto* result = mojo::ConvertTo<HandwritingRecognizerQueryResult*>(
std::move(query_result));
resolver->Resolve(result);
}
} // namespace
const char HandwritingRecognitionService::kSupplementName[] =
"NavigatorHandwritingRecognitionService";
HandwritingRecognitionService::HandwritingRecognitionService(
Navigator& navigator)
: Supplement<Navigator>(navigator),
remote_service_(navigator.GetExecutionContext()) {}
// static
HandwritingRecognitionService& HandwritingRecognitionService::From(
Navigator& navigator) {
HandwritingRecognitionService* supplement =
Supplement<Navigator>::From<HandwritingRecognitionService>(navigator);
if (!supplement) {
supplement = MakeGarbageCollected<HandwritingRecognitionService>(navigator);
ProvideTo(navigator, supplement);
}
return *supplement;
}
// static
ScriptPromise<HandwritingRecognizer>
HandwritingRecognitionService::createHandwritingRecognizer(
ScriptState* script_state,
Navigator& navigator,
const HandwritingModelConstraint* constraint,
ExceptionState& exception_state) {
return HandwritingRecognitionService::From(navigator)
.CreateHandwritingRecognizer(script_state, constraint, exception_state);
}
bool HandwritingRecognitionService::BootstrapMojoConnectionIfNeeded(
ScriptState* script_state,
ExceptionState& exception_state) {
// We need to do the following check because the execution context of this
// navigator may be invalid (e.g. the frame is detached).
if (!script_state->ContextIsValid()) {
exception_state.ThrowDOMException(DOMExceptionCode::kInvalidStateError,
"The execution context is invalid");
return false;
}
// Note that we do not use `ExecutionContext::From(script_state)` because
// the ScriptState passed in may not be guaranteed to match the execution
// context associated with this navigator, especially with
// cross-browsing-context calls.
auto* execution_context = GetSupplementable()->GetExecutionContext();
if (!remote_service_.is_bound()) {
execution_context->GetBrowserInterfaceBroker().GetInterface(
remote_service_.BindNewPipeAndPassReceiver(
execution_context->GetTaskRunner(TaskType::kInternalDefault)));
}
return true;
}
ScriptPromise<HandwritingRecognizer>
HandwritingRecognitionService::CreateHandwritingRecognizer(
ScriptState* script_state,
const HandwritingModelConstraint* blink_model_constraint,
ExceptionState& exception_state) {
if (!BootstrapMojoConnectionIfNeeded(script_state, exception_state)) {
return EmptyPromise();
}
auto* resolver =
MakeGarbageCollected<ScriptPromiseResolver<HandwritingRecognizer>>(
script_state, exception_state.GetContext());
auto promise = resolver->Promise();
auto mojo_model_constraint =
handwriting::mojom::blink::HandwritingModelConstraint::New();
for (auto const& lang : blink_model_constraint->languages()) {
mojo_model_constraint->languages.push_back(lang);
}
remote_service_->CreateHandwritingRecognizer(
std::move(mojo_model_constraint),
WTF::BindOnce(OnCreateHandwritingRecognizer, WrapPersistent(script_state),
WrapPersistent(resolver)));
return promise;
}
// static
ScriptPromise<IDLNullable<HandwritingRecognizerQueryResult>>
HandwritingRecognitionService::queryHandwritingRecognizer(
ScriptState* script_state,
Navigator& navigator,
const HandwritingModelConstraint* constraint,
ExceptionState& exception_state) {
return HandwritingRecognitionService::From(navigator)
.QueryHandwritingRecognizer(script_state, constraint, exception_state);
}
ScriptPromise<IDLNullable<HandwritingRecognizerQueryResult>>
HandwritingRecognitionService::QueryHandwritingRecognizer(
ScriptState* script_state,
const HandwritingModelConstraint* constraint,
ExceptionState& exception_state) {
if (!BootstrapMojoConnectionIfNeeded(script_state, exception_state)) {
return ScriptPromise<IDLNullable<HandwritingRecognizerQueryResult>>();
}
auto* resolver = MakeGarbageCollected<
ScriptPromiseResolver<IDLNullable<HandwritingRecognizerQueryResult>>>(
script_state, exception_state.GetContext());
auto promise = resolver->Promise();
remote_service_->QueryHandwritingRecognizer(
mojo::ConvertTo<handwriting::mojom::blink::HandwritingModelConstraintPtr>(
constraint),
WTF::BindOnce(&OnQueryHandwritingRecognizer, WrapPersistent(script_state),
WrapPersistent(resolver)));
return promise;
}
void HandwritingRecognitionService::Trace(Visitor* visitor) const {
visitor->Trace(remote_service_);
Supplement<Navigator>::Trace(visitor);
}
} // namespace blink
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