Plugin/Source/SenseGloveAndroid/Private/SGAndroid/SGAndroidPermissions.cpp

/**
 * @file
 *
 * @author  Mamadou Babaei <mamadou@senseglove.com>
 *
 * @section LICENSE
 *
 * (The MIT License)
 *
 * Copyright (c) 2020 - 2025 SenseGlove
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * @section DESCRIPTION
 *
 *
 */


#include "SGAndroid/SGAndroidPermissions.h"

#include "AndroidPermissionCallbackProxy.h"
#include "AndroidPermissionFunctionLibrary.h"
#include "Engine/Engine.h"

#include "SGLog/SGLog.h"

struct USGAndroidPermissions::FImpl
{
    /************************
     * Member variables
     ************************/

    TFunction<void(const TArray<FString>&, const TArray<bool>&)> PermissionsGrantedCallback;

    /************************
     * Owner object
     ************************/

    USGAndroidPermissions* Owner;

    /************************
     * Constructor / Destructor
     ************************/

    explicit FImpl(USGAndroidPermissions* InOwner);
    ~FImpl();

    /************************
     * Default copy constructor & copy assignment operator
     ************************/

    FImpl(const FImpl& Rhs) = default;
    FImpl& operator=(const FImpl& Rhs) = default;
};

USGAndroidPermissions* USGAndroidPermissions::GetInstance()
{
    if (!ensureAlwaysMsgf(GEngine, TEXT("The engine has not been initialized!")))
    {
        return nullptr;
    }

    USGAndroidPermissions* Instance{GEngine->GetEngineSubsystem<USGAndroidPermissions>()};
    return Instance;
}

USGAndroidPermissions::USGAndroidPermissions()
    : Pimpl(TUniquePtr<FImpl, FImplDeleter>(new FImpl{this}, PimplDeleter))
{
}

void USGAndroidPermissions::Request(
    const TFunction<void(const TArray<FString>&, const TArray<bool>&)>& PermissionsGrantedCallback)
{
    TArray<FString> Permissions{
        "android.permission.ACCESS_BACKGROUND_LOCATION",
        "android.permission.ACCESS_FINE_LOCATION",
        "android.permission.BLUETOOTH",
        "android.permission.BLUETOOTH_ADMIN",
        "android.permission.BLUETOOTH_ADVERTISE",
        "android.permission.BLUETOOTH_CONNECT",
        "android.permission.BLUETOOTH_SCAN",
    };

    bool bHasAllRequiredPermissions = false;
    for (const FString& Permission: Permissions)
    {
        const bool bHasPermission = UAndroidPermissionFunctionLibrary::CheckPermission(Permission);
        bHasAllRequiredPermissions = bHasPermission;
        if (!bHasAllRequiredPermissions)
        {
            break;
        }
    }

    if (!bHasAllRequiredPermissions)
    {
        Pimpl->PermissionsGrantedCallback = PermissionsGrantedCallback;

        UAndroidPermissionFunctionLibrary::AcquirePermissions(
            MoveTemp(Permissions))->OnPermissionsGrantedDelegate.AddUObject(
            this, &USGAndroidPermissions::OnPermissionsGranted);
    }
    else
    {
        TArray<bool> GrantedResults;
        for (int32 i = 0; i < Permissions.Num(); ++i)
        {
            GrantedResults.Add(true);
        }
        PermissionsGrantedCallback(MoveTemp(Permissions), MoveTemp(GrantedResults));
    }
}

void USGAndroidPermissions::OnPermissionsGranted(const TArray<FString>& Permissions, const TArray<bool>& GrantResults)
{
    if (!ensureAlwaysMsgf(Permissions.Num() == GrantResults.Num(),
                          TEXT("Mismatched number of Permissions and GrantedResults!")))
    {
        return;
    }

    for (int32 i = 0; i < Permissions.Num(); ++i)
    {
        if (GrantResults[i])
        {
            SGLOG("Permission Granted", Permissions[i]);
        }
        else
        {
            SGLOG("Permission Denied", Permissions[i]);
        }
    }

    Pimpl->PermissionsGrantedCallback(Permissions, GrantResults);
}

bool USGAndroidPermissions::ShouldCreateSubsystem(UObject* Outer) const
{
    return true;
}

void USGAndroidPermissions::Initialize(FSubsystemCollectionBase& Collection)
{
    SGLOG("Initializing the SenseGlove Android permissions singleton with the engine lifetime...");

    Super::Initialize(Collection);

    SGLOG("The SenseGlove Android permissions singleton has been successfully initialized with the engine lifetime!");
}

void USGAndroidPermissions::Deinitialize()
{
    SGLOG("De-initializing the SenseGlove Android permissions singleton due to the engine lifetime expiration...");

    Super::Deinitialize();

    (void) Pimpl.Release();

    SGLOG("The SenseGlove Android permissions singleton has been successfully de-initialized!");
}

USGAndroidPermissions::FImpl::FImpl(USGAndroidPermissions* InOwner)
    : Owner(InOwner)
{
}

USGAndroidPermissions::FImpl::~FImpl() = default;

void USGAndroidPermissions::FImplDeleter::operator()(const FImpl* P) const
{
    delete P;
}