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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_ON_DEVICE_TRANSLATION_TRANSLATION_MANAGER_IMPL_H_
#define CHROME_BROWSER_ON_DEVICE_TRANSLATION_TRANSLATION_MANAGER_IMPL_H_
#include "base/auto_reset.h"
#include "base/gtest_prod_util.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/supports_user_data.h"
#include "base/types/pass_key.h"
#include "chrome/browser/ai/ai_model_download_progress_manager.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/render_frame_host.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "mojo/public/cpp/bindings/receiver_set.h"
#include "mojo/public/cpp/bindings/unique_receiver_set.h"
#include "third_party/blink/public/mojom/ai/model_download_progress_observer.mojom-forward.h"
#include "third_party/blink/public/mojom/on_device_translation/translation_manager.mojom.h"
#include "third_party/blink/public/mojom/on_device_translation/translator.mojom.h"
#include "url/origin.h"
namespace on_device_translation {
class OnDeviceTranslationServiceController;
// The browser-side implementation of `blink::mojom::TranslationManager`, it
// is owned by a SupportsUserData (DocumentAssociatedData for frames,
// DedicatedWorkerHost, SharedWorkerHost and ServiceWorkerHost).
class TranslationManagerImpl : public base::SupportsUserData::Data,
public blink::mojom::TranslationManager {
public:
TranslationManagerImpl(base::PassKey<TranslationManagerImpl>,
content::BrowserContext* browser_context,
const url::Origin& origin);
TranslationManagerImpl(const TranslationManagerImpl&) = delete;
TranslationManagerImpl& operator=(const TranslationManagerImpl&) = delete;
~TranslationManagerImpl() override;
// Sets an instance of `TranslationManagerImpl` for testing.
static base::AutoReset<TranslationManagerImpl*> SetForTesting(
TranslationManagerImpl* manager);
static void Bind(
content::BrowserContext* browser_context,
base::SupportsUserData* context_user_data,
const url::Origin& origin,
mojo::PendingReceiver<blink::mojom::TranslationManager> receiver);
protected:
TranslationManagerImpl(content::BrowserContext* browser_context,
const url::Origin& origin);
content::BrowserContext* browser_context() { return browser_context_.get(); }
private:
friend class TranslationManagerImplTest;
static TranslationManagerImpl* GetOrCreate(
content::BrowserContext* browser_context,
base::SupportsUserData* context_user_data,
const url::Origin& origin);
std::optional<std::string> GetBestFitLanguageCode(
std::string requested_language);
// Returns a delay upon initial translator creation to safeguard against
// fingerprinting resulting from timing translator creation duration.
//
// The delay is triggered when the `availability()` of the translation
// evaluates to "downloadable", even though all required resources for
// translation have already been downloaded and available.
//
// Overridden for testing.
virtual base::TimeDelta GetTranslatorDownloadDelay();
virtual component_updater::ComponentUpdateService*
GetComponentUpdateService();
// Returns whether the "crash" language code is allowed. This is used for
// testing.
virtual bool CrashesAllowed();
void CreateTranslatorImpl(
mojo::PendingRemote<
blink::mojom::TranslationManagerCreateTranslatorClient> client,
const std::string& source_language,
const std::string& target_language);
// Dictionary keys for the `INITIALIZED_TRANSLATIONS` website setting.
// Schema (per origin):
// {
// ...
// "<source language code>" : { "<target language code>", ... }
// "en" : { "es", "fr", ... }
// "ja" : { "fr", "de", ... }
// ...
// }
base::Value GetInitializedTranslationsValue();
// Determine if a translator has been initialized for the given languages.
bool HasInitializedTranslator(const std::string& source_language,
const std::string& target_language);
// Set the stored website setting value to the given dictionary of translation
// language pairs.
void SetTranslatorInitializedContentSetting(
base::Value initialized_translations);
// Updates the corresponding website setting to store information
// for the given translation language pair, as needed.
void SetInitializedTranslation(const std::string& source_language,
const std::string& target_language);
// `blink::mojom::TranslationManager` implementation.
void CreateTranslator(
mojo::PendingRemote<
blink::mojom::TranslationManagerCreateTranslatorClient> client,
blink::mojom::TranslatorCreateOptionsPtr options,
bool add_fake_download_delay) override;
void TranslationAvailable(blink::mojom::TranslatorLanguageCodePtr source_lang,
blink::mojom::TranslatorLanguageCodePtr target_lang,
TranslationAvailableCallback callback) override;
OnDeviceTranslationServiceController& GetServiceController();
// Instance of `TranslationManagerImpl` for testing.
static TranslationManagerImpl* translation_manager_for_test_;
const base::WeakPtr<content::BrowserContext> browser_context_;
const url::Origin origin_;
scoped_refptr<OnDeviceTranslationServiceController> service_controller_;
mojo::UniqueReceiverSet<blink::mojom::Translator> translators_;
mojo::ReceiverSet<blink::mojom::TranslationManager> receiver_set_;
on_device_ai::AIModelDownloadProgressManager model_download_progress_manager_;
base::WeakPtrFactory<TranslationManagerImpl> weak_ptr_factory_{this};
};
} // namespace on_device_translation
#endif // CHROME_BROWSER_ON_DEVICE_TRANSLATION_TRANSLATION_MANAGER_IMPL_H_
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