libreoffice/vcl/ios/iOSTransferable.cxx

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#include <sal/config.h>

#include <com/sun/star/datatransfer/UnsupportedFlavorException.hpp>
#include <com/sun/star/lang/IllegalArgumentException.hpp>
#include <sal/log.hxx>
#include <sal/types.h>
#include <osl/diagnose.h>

#include "iOSTransferable.hxx"

#include "DataFlavorMapping.hxx"

using namespace std;
using namespace osl;
using namespace cppu;
using namespace com::sun::star::uno;
using namespace com::sun::star::datatransfer;
using namespace com::sun::star::lang;

namespace
{
bool isValidFlavor(const DataFlavor& aFlavor)
{
    size_t len = aFlavor.MimeType.getLength();
    Type dtype = aFlavor.DataType;
    return ((len > 0)
            && ((dtype == cppu::UnoType<Sequence<sal_Int8>>::get())
                || (dtype == cppu::UnoType<OUString>::get())));
}

bool cmpAllContentTypeParameter(const Reference<XMimeContentType>& xLhs,
                                const Reference<XMimeContentType>& xRhs)
{
    Sequence<OUString> xLhsFlavors = xLhs->getParameters();
    Sequence<OUString> xRhsFlavors = xRhs->getParameters();

    // Stop here if the number of parameters is different already
    if (xLhsFlavors.getLength() != xRhsFlavors.getLength())
        return false;

    try
    {
        OUString pLhs;
        OUString pRhs;

        for (sal_Int32 i = 0; i < xLhsFlavors.getLength(); i++)
        {
            pLhs = xLhs->getParameterValue(xLhsFlavors[i]);
            pRhs = xRhs->getParameterValue(xLhsFlavors[i]);

            if (!pLhs.equalsIgnoreAsciiCase(pRhs))
            {
                return false;
            }
        }
    }
    catch (IllegalArgumentException&)
    {
        return false;
    }

    return true;
}

} // unnamed namespace

iOSTransferable::iOSTransferable(const Reference<XMimeContentTypeFactory>& rXMimeCntFactory,
                                 std::shared_ptr<DataFlavorMapper> pDataFlavorMapper,
                                 UIPasteboard* pasteboard)
    : mrXMimeCntFactory(rXMimeCntFactory)
    , mDataFlavorMapper(pDataFlavorMapper)
    , mPasteboard(pasteboard)
{
    [mPasteboard retain];

    initClipboardItemList();
}

iOSTransferable::~iOSTransferable() { [mPasteboard release]; }

Any SAL_CALL iOSTransferable::getTransferData(const DataFlavor& aFlavor)
{
    if (!isValidFlavor(aFlavor) || !isDataFlavorSupported(aFlavor))
    {
        throw UnsupportedFlavorException("Unsupported data flavor",
                                         static_cast<XTransferable*>(this));
    }

    bool bInternal(false);
    NSString* sysFormat = (aFlavor.MimeType.startsWith("image/png"))
                              ? DataFlavorMapper::openOfficeImageToSystemFlavor(mPasteboard)
                              : mDataFlavorMapper->openOfficeToSystemFlavor(aFlavor, bInternal);
    DataProviderPtr_t dp;

    NSData* sysData = [mPasteboard dataForPasteboardType:sysFormat];
    dp = DataFlavorMapper::getDataProvider(sysFormat, sysData);

    if (dp.get() == nullptr)
    {
        throw UnsupportedFlavorException("Unsupported data flavor",
                                         static_cast<XTransferable*>(this));
    }

    return dp->getOOoData();
}

Sequence<DataFlavor> SAL_CALL iOSTransferable::getTransferDataFlavors() { return mFlavorList; }

sal_Bool SAL_CALL iOSTransferable::isDataFlavorSupported(const DataFlavor& aFlavor)
{
    for (sal_Int32 i = 0; i < mFlavorList.getLength(); i++)
        if (compareDataFlavors(aFlavor, mFlavorList[i]))
            return true;

    return false;
}

void iOSTransferable::initClipboardItemList()
{
    NSArray* pboardFormats = [mPasteboard pasteboardTypes];

    if (pboardFormats == nullptr)
    {
        throw RuntimeException("Cannot get clipboard data", static_cast<XTransferable*>(this));
    }

#ifdef SAL_LOG_INFO
    NSString* types = @"";
    for (unsigned i = 0; i < [pboardFormats count]; i++)
    {
        if ([types length] > 0)
            types = [types stringByAppendingString:@", "];
        types = [types stringByAppendingString:[pboardFormats objectAtIndex:i]];
    }
    SAL_INFO("vcl.ios.clipboard", "Types on clipboard: " << [types UTF8String]);
#endif

    mFlavorList = mDataFlavorMapper->typesArrayToFlavorSequence(pboardFormats);
}

/* Compares two DataFlavors. Returns true if both DataFlavor have the same media type
   and the number of parameter and all parameter values do match otherwise false
   is returned.
 */
bool iOSTransferable::compareDataFlavors(const DataFlavor& lhs, const DataFlavor& rhs)
{
    try
    {
        Reference<XMimeContentType> xLhs(mrXMimeCntFactory->createMimeContentType(lhs.MimeType));
        Reference<XMimeContentType> xRhs(mrXMimeCntFactory->createMimeContentType(rhs.MimeType));

        if (!xLhs->getFullMediaType().equalsIgnoreAsciiCase(xRhs->getFullMediaType())
            || !cmpAllContentTypeParameter(xLhs, xRhs))
        {
            return false;
        }
    }
    catch (IllegalArgumentException&)
    {
        OSL_FAIL("Invalid content type detected");
        return false;
    }

    return true;
}

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