Source/WebCore/Modules/filesystemaccess/FileSystemFileHandle.cpp

/*
 * Copyright (C) 2021 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
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 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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#include "config.h"
#include "FileSystemFileHandle.h"

#include "File.h"
#include "FileSystemHandleCloseScope.h"
#include "FileSystemStorageConnection.h"
#include "FileSystemSyncAccessHandle.h"
#include "JSDOMPromiseDeferred.h"
#include "JSFile.h"
#include "JSFileSystemSyncAccessHandle.h"
#include "WorkerFileSystemStorageConnection.h"
#include <wtf/IsoMallocInlines.h>

namespace WebCore {

WTF_MAKE_ISO_ALLOCATED_IMPL(FileSystemFileHandle);

Ref<FileSystemFileHandle> FileSystemFileHandle::create(ScriptExecutionContext& context, String&& name, FileSystemHandleIdentifier identifier, Ref<FileSystemStorageConnection>&& connection)
{
    auto result = adoptRef(*new FileSystemFileHandle(context, WTFMove(name), identifier, WTFMove(connection)));
    result->suspendIfNeeded();
    return result;
}

FileSystemFileHandle::FileSystemFileHandle(ScriptExecutionContext& context, String&& name, FileSystemHandleIdentifier identifier, Ref<FileSystemStorageConnection>&& connection)
    : FileSystemHandle(context, FileSystemHandle::Kind::File, WTFMove(name), identifier, WTFMove(connection))
{
}

void FileSystemFileHandle::getFile(DOMPromiseDeferred<IDLInterface<File>>&& promise)
{
    if (isClosed())
        return promise.reject(Exception { InvalidStateError, "Handle is closed"_s });

    connection().getFile(identifier(), [protectedThis = Ref { *this }, promise = WTFMove(promise)](auto result) mutable {
        if (result.hasException())
            return promise.reject(result.releaseException());

        auto* context = protectedThis->scriptExecutionContext();
        if (!context)
            return promise.reject(Exception { InvalidStateError, "Context has stopped"_s });

        promise.resolve(File::create(context, result.returnValue(), { }, protectedThis->name()));
    });
}

void FileSystemFileHandle::createSyncAccessHandle(DOMPromiseDeferred<IDLInterface<FileSystemSyncAccessHandle>>&& promise)
{
    if (isClosed())
        return promise.reject(Exception { InvalidStateError, "Handle is closed"_s });

    connection().createSyncAccessHandle(identifier(), [protectedThis = Ref { *this }, promise = WTFMove(promise)](auto result) mutable {
        if (result.hasException())
            return promise.reject(result.releaseException());

        auto [identifier, file] = result.releaseReturnValue();
        if (!file)
            return promise.reject(Exception { UnknownError, "Invalid platform file handle"_s });

        auto* context = protectedThis->scriptExecutionContext();
        if (!context) {
            protectedThis->closeSyncAccessHandle(identifier, { });
            return promise.reject(Exception { InvalidStateError, "Context has stopped"_s });
        }

        promise.resolve(FileSystemSyncAccessHandle::create(*context, protectedThis.get(), identifier, WTFMove(file)));
    });
}

void FileSystemFileHandle::closeSyncAccessHandle(FileSystemSyncAccessHandleIdentifier accessHandleIdentifier, CompletionHandler<void(ExceptionOr<void>&&)>&& completionHandler)
{
    if (isClosed())
        return completionHandler(Exception { InvalidStateError, "Handle is closed"_s });

    connection().closeSyncAccessHandle(identifier(), accessHandleIdentifier, WTFMove(completionHandler));
}

void FileSystemFileHandle::registerSyncAccessHandle(FileSystemSyncAccessHandleIdentifier identifier, FileSystemSyncAccessHandle& handle)
{
    if (isClosed())
        return;

    downcast<WorkerFileSystemStorageConnection>(connection()).registerSyncAccessHandle(identifier, handle);
}

void FileSystemFileHandle::unregisterSyncAccessHandle(FileSystemSyncAccessHandleIdentifier identifier)
{
    if (isClosed())
        return;

    connection().unregisterSyncAccessHandle(identifier);
}

} // namespace WebCore