libreoffice/vcl/ios/DataFlavorMapping.cxx

/* -*- Mode: ObjC; 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 "DataFlavorMapping.hxx"
#include "HtmlFmtFlt.hxx"
#include <com/sun/star/datatransfer/UnsupportedFlavorException.hpp>
#include <com/sun/star/datatransfer/XMimeContentType.hpp>
#include <com/sun/star/datatransfer/MimeContentTypeFactory.hpp>
#include <com/sun/star/lang/IllegalArgumentException.hpp>
#include <com/sun/star/uno/Sequence.hxx>
#include <comphelper/processfactory.hxx>

#include <rtl/ustring.hxx>
#include <sal/log.hxx>
#include <osl/endian.h>

#include <cassert>
#include <cstring>

#include <premac.h>
#include <UIKit/UIKit.h>
#include <MobileCoreServices/MobileCoreServices.h>
#include <postmac.h>

using namespace css::datatransfer;
using namespace css::uno;
using namespace css::lang;
using namespace cppu;

namespace
{
/* Determine whether or not a DataFlavor is valid.
   */
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())));
}

OUString NSStringToOUString(const NSString* cfString)
{
    assert(cfString && "Invalid parameter");

    const char* utf8Str = [cfString UTF8String];
    unsigned int len = rtl_str_getLength(utf8Str);

    return OUString(utf8Str, len, RTL_TEXTENCODING_UTF8);
}

NSString* OUStringToNSString(const OUString& ustring)
{
    OString utf8Str = OUStringToOString(ustring, RTL_TEXTENCODING_UTF8);
    return [NSString stringWithCString:utf8Str.getStr() encoding:NSUTF8StringEncoding];
}

NSString* PBTYPE_UTF8PLAINTEXT = (__bridge NSString*)kUTTypeUTF8PlainText;
NSString* PBTYPE_RTF = (__bridge NSString*)kUTTypeRTF;
NSString* PBTYPE_PNG = (__bridge NSString*)kUTTypePNG;
NSString* PBTYPE_JPEG = (__bridge NSString*)kUTTypeJPEG;
NSString* PBTYPE_HTML = (__bridge NSString*)kUTTypeHTML;
NSString* PBTYPE_PDF = (__bridge NSString*)kUTTypePDF;

const char* FLAVOR_SESX
    = "application/x-openoffice-embed-source-xml;windows_formatname=\"Star Embed Source (XML)\"";
const char* FLAVOR_SLSDX = "application/"
                           "x-openoffice-linksrcdescriptor-xml;windows_formatname=\"Star Link "
                           "Source Descriptor (XML)\"";
const char* FLAVOR_LSX
    = "application/x-openoffice-link-source-xml;windows_formatname=\"Star Link Source (XML)\"";
const char* FLAVOR_EOX
    = "application/x-openoffice-embedded-obj-xml;windows_formatname=\"Star Embedded Object (XML)\"";
const char* FLAVOR_SVXB
    = "application/x-openoffice-svbx;windows_formatname=\"SVXB (StarView Bitmap/Animation)\"";
const char* FLAVOR_GDIMF
    = "application/x-openoffice-gdimetafile;windows_formatname=\"GDIMetaFile\"";
const char* FLAVOR_SODX = "application/x-openoffice-objectdescriptor-xml;windows_formatname=\"Star "
                          "Object Descriptor (XML)\"";
struct FlavorMap
{
    NSString* SystemFlavor;
    const char* OOoFlavor;
    const char* HumanPresentableName;
    bool DataTypeOUString; // sequence<byte> otherwise
};

// The SystemFlavor member is nil for the cases where there is no predefined pasteboard type UTI and
// we use the internal MIME type (media type) also on the pasteboard. That is OK, there dos not seem
// to be a requirement that the types are well-formed UTIs even on iOS. For an introduction to UTIs,
// see for instance
// https://alastairs-place.net/blog/2012/06/06/utis-are-better-than-you-think-and-heres-why/
//
// In those cases the MIME type might actually have parameters appended, separated by semicolons.
// At least the FLAVOR_SODX one must have at least a typename="%PRODUCTNAME %PRODUCTVERSION
// Spreadsheet" parameter (with macros expanded and translated) for LO to recognise it. See
// lcl_TestFormat() in sc/source/ui/view/cellsh.cxx.

static const FlavorMap flavorMap[]
    = { { PBTYPE_UTF8PLAINTEXT, "text/plain;charset=utf-16", "Unicode Text (UTF-16)", true },
        { PBTYPE_RTF, "text/rtf", "Rich Text Format", false },
        { PBTYPE_PNG, "image/png", "Portable Network Graphics", false },
        { PBTYPE_JPEG, "image/jpeg", "JPEG", false },
        { PBTYPE_HTML, "text/html", "Plain HTML", false },
        { PBTYPE_PDF, "application/pdf", "PDF File", false },
        { nil, FLAVOR_SESX, "Star Embed Source (XML)", false },
        { nil, FLAVOR_SLSDX, "Star Link Source Descriptor (XML)", false },
        { nil, FLAVOR_LSX, "Star Link Source (XML)", false },
        { nil, FLAVOR_EOX, "Star Embedded Object (XML)", false },
        { nil, FLAVOR_SVXB, "SVXB (StarView Bitmap/Animation", false },
        { nil, FLAVOR_GDIMF, "GDIMetaFile", false },
        { nil, FLAVOR_SODX, "Star Object Descriptor (XML)", false } };

#define SIZE_FLAVOR_MAP (sizeof(flavorMap) / sizeof(FlavorMap))

inline bool isByteSequenceType(const Type& theType)
{
    return (theType == cppu::UnoType<Sequence<sal_Int8>>::get());
}

inline bool isOUStringType(const Type& theType)
{
    return (theType == cppu::UnoType<OUString>::get());
}

} // unnamed namespace

/* A base class for other data provider.
 */
class DataProviderBaseImpl : public DataProvider
{
public:
    DataProviderBaseImpl(const Any& data);
    DataProviderBaseImpl(id data);
    virtual ~DataProviderBaseImpl() override;

protected:
    Any mData;
    //NSData* mSystemData;
    id mSystemData;
};

DataProviderBaseImpl::DataProviderBaseImpl(const Any& data)
    : mData(data)
    , mSystemData(nil)
{
}

DataProviderBaseImpl::DataProviderBaseImpl(id data)
    : mSystemData(data)
{
    [mSystemData retain];
}

DataProviderBaseImpl::~DataProviderBaseImpl()
{
    if (mSystemData)
    {
        [mSystemData release];
    }
}

class Utf8DataProvider : public DataProviderBaseImpl
{
public:
    Utf8DataProvider(const Any& data);
    Utf8DataProvider(NSData* data);

    NSData* getSystemData() override;
    Any getOOoData() override;
};

Utf8DataProvider::Utf8DataProvider(const Any& data)
    : DataProviderBaseImpl(data)
{
}

Utf8DataProvider::Utf8DataProvider(NSData* data)
    : DataProviderBaseImpl(data)
{
}

NSData* Utf8DataProvider::getSystemData()
{
    OUString ustr;
    mData >>= ustr;

    OString strUtf8;
    ustr.convertToString(&strUtf8, RTL_TEXTENCODING_UTF8, OUSTRING_TO_OSTRING_CVTFLAGS);

    return [NSData dataWithBytes:strUtf8.getStr() length:strUtf8.getLength()];
}

Any Utf8DataProvider::getOOoData()
{
    Any oOOData;

    if (mSystemData)
    {
        oOOData <<= OUString(static_cast<const char*>([mSystemData bytes]), [mSystemData length],
                             RTL_TEXTENCODING_UTF8);
    }
    else
    {
        oOOData = mData;
    }

    return oOOData;
}

class ByteSequenceDataProvider : public DataProviderBaseImpl
{
public:
    ByteSequenceDataProvider(const Any& data);
    ByteSequenceDataProvider(NSData* data);

    NSData* getSystemData() override;
    Any getOOoData() override;
};

ByteSequenceDataProvider::ByteSequenceDataProvider(const Any& data)
    : DataProviderBaseImpl(data)
{
}

ByteSequenceDataProvider::ByteSequenceDataProvider(NSData* data)
    : DataProviderBaseImpl(data)
{
}

NSData* ByteSequenceDataProvider::getSystemData()
{
    Sequence<sal_Int8> rawData;
    mData >>= rawData;

    return [NSData dataWithBytes:rawData.getArray() length:rawData.getLength()];
}

Any ByteSequenceDataProvider::getOOoData()
{
    Any oOOData;

    if (mSystemData)
    {
        unsigned int flavorDataLength = [mSystemData length];
        Sequence<sal_Int8> byteSequence;
        byteSequence.realloc(flavorDataLength);
        memcpy(byteSequence.getArray(), [mSystemData bytes], flavorDataLength);
        oOOData <<= byteSequence;
    }
    else
    {
        oOOData = mData;
    }

    return oOOData;
}

class HTMLFormatDataProvider : public DataProviderBaseImpl
{
public:
    HTMLFormatDataProvider(NSData* data);

    NSData* getSystemData() override;
    Any getOOoData() override;
};

HTMLFormatDataProvider::HTMLFormatDataProvider(NSData* data)
    : DataProviderBaseImpl(data)
{
}

NSData* HTMLFormatDataProvider::getSystemData()
{
    Sequence<sal_Int8> textHtmlData;
    mData >>= textHtmlData;

    Sequence<sal_Int8> htmlFormatData = TextHtmlToHTMLFormat(textHtmlData);

    return [NSData dataWithBytes:htmlFormatData.getArray() length:htmlFormatData.getLength()];
}

Any HTMLFormatDataProvider::getOOoData()
{
    Any oOOData;

    if (mSystemData)
    {
        unsigned int flavorDataLength = [mSystemData length];
        Sequence<sal_Int8> unkHtmlData;

        unkHtmlData.realloc(flavorDataLength);
        memcpy(unkHtmlData.getArray(), [mSystemData bytes], flavorDataLength);

        Sequence<sal_Int8>* pPlainHtml = &unkHtmlData;
        Sequence<sal_Int8> plainHtml;

        if (isHTMLFormat(unkHtmlData))
        {
            plainHtml = HTMLFormatToTextHtml(unkHtmlData);
            pPlainHtml = &plainHtml;
        }

        oOOData <<= *pPlainHtml;
    }
    else
    {
        oOOData = mData;
    }

    return oOOData;
}

DataFlavorMapper::DataFlavorMapper()
{
    Reference<XComponentContext> xContext = comphelper::getProcessComponentContext();
    mrXMimeCntFactory = MimeContentTypeFactory::create(xContext);
}

DataFlavorMapper::~DataFlavorMapper()
{
    // release potential NSStrings
    for (OfficeOnlyTypes::iterator it = maOfficeOnlyTypes.begin(); it != maOfficeOnlyTypes.end();
         ++it)
    {
        [it->second release];
        it->second = nil;
    }
}

DataFlavor DataFlavorMapper::systemToOpenOfficeFlavor(const NSString* systemDataFlavor) const
{
    DataFlavor oOOFlavor;

    for (size_t i = 0; i < SIZE_FLAVOR_MAP; i++)
    {
        if ((flavorMap[i].SystemFlavor == nil
             && ([systemDataFlavor
                     isEqualToString:[NSString stringWithUTF8String:flavorMap[i].OOoFlavor]]
                 ||
                 [systemDataFlavor hasPrefix:[[NSString stringWithUTF8String:flavorMap[i].OOoFlavor]
                                                 stringByAppendingString:@";"]]))
            || (flavorMap[i].SystemFlavor != nil &&
                [systemDataFlavor
                    isEqualToString:const_cast<NSString*>(flavorMap[i].SystemFlavor)]))
        {
            if (flavorMap[i].SystemFlavor == nil)
                oOOFlavor.MimeType = NSStringToOUString(systemDataFlavor);
            else
                oOOFlavor.MimeType = OUString::createFromAscii(flavorMap[i].OOoFlavor);
            oOOFlavor.HumanPresentableName
                = OUString::createFromAscii(flavorMap[i].HumanPresentableName);
            oOOFlavor.DataType = flavorMap[i].DataTypeOUString
                                     ? cppu::UnoType<OUString>::get()
                                     : cppu::UnoType<Sequence<sal_Int8>>::get();
            return oOOFlavor;
        }
    } // for

    // look if this might be an internal type; if it comes in here it must have
    // been through openOfficeToSystemFlavor before, so it should then be in the map
    OUString aTryFlavor(NSStringToOUString(systemDataFlavor));
    if (maOfficeOnlyTypes.find(aTryFlavor) != maOfficeOnlyTypes.end())
    {
        oOOFlavor.MimeType = aTryFlavor;
        oOOFlavor.HumanPresentableName.clear();
        oOOFlavor.DataType = cppu::UnoType<Sequence<sal_Int8>>::get();
    }

    return oOOFlavor;
}

NSString* DataFlavorMapper::openOfficeToSystemFlavor(const DataFlavor& oOOFlavor,
                                                     bool& rbInternal) const
{
    NSString* sysFlavor = nullptr;
    rbInternal = false;

    for (size_t i = 0; i < SIZE_FLAVOR_MAP; ++i)
    {
        if (oOOFlavor.MimeType.startsWith(OUString::createFromAscii(flavorMap[i].OOoFlavor)))
        {
            if (flavorMap[i].SystemFlavor != nil)
                sysFlavor = flavorMap[i].SystemFlavor;
            else
                sysFlavor = OUStringToNSString(oOOFlavor.MimeType);
        }
    }

    if (!sysFlavor)
    {
        // For some reason, if we allow text/html, we get an OSL_ENSURE failure in xmloff that
        // apparently is a symptom of something being seriously wrong:
        // xmloff/source/transform/OOo2Oasis.cxx:1925: duplicate doc handler
        // Because is then followed a bit later by an assertion failure:
        // Assertion failed: (!m_pFirst && !m_pLast && "There are still indices registered"), function ~SwContentIndexReg, file [...]/sw/source/core/bastyp/index.cxx, line 226

        if (oOOFlavor.MimeType == "text/html")
            return nil;

        rbInternal = true;
        OfficeOnlyTypes::const_iterator it = maOfficeOnlyTypes.find(oOOFlavor.MimeType);

        if (it == maOfficeOnlyTypes.end())
            sysFlavor = maOfficeOnlyTypes[oOOFlavor.MimeType]
                = OUStringToNSString(oOOFlavor.MimeType);
        else
            sysFlavor = it->second;
    }

    return sysFlavor;
}

NSString* DataFlavorMapper::openOfficeImageToSystemFlavor()
{
    if ([[UIPasteboard generalPasteboard] containsPasteboardTypes:@[ PBTYPE_PNG ]])
        return PBTYPE_PNG;
    else if ([[UIPasteboard generalPasteboard] containsPasteboardTypes:@[ PBTYPE_JPEG ]])
        return PBTYPE_JPEG;
    else if ([[UIPasteboard generalPasteboard] containsPasteboardTypes:@[ PBTYPE_PDF ]])
        return PBTYPE_PDF;
    return @"";
}

DataProviderPtr_t
DataFlavorMapper::getDataProvider(const NSString* systemFlavor,
                                  Reference<XTransferable> const& rTransferable) const
{
    DataProviderPtr_t dp;

    try
    {
        DataFlavor oOOFlavor = systemToOpenOfficeFlavor(systemFlavor);

        Any data = rTransferable->getTransferData(oOOFlavor);

        if (isByteSequenceType(data.getValueType()))
        {
            dp = DataProviderPtr_t(new ByteSequenceDataProvider(data));
        }
        else // Must be OUString type
        {
            SAL_WARN_IF(!isOUStringType(data.getValueType()), "vcl", "must be OUString type");
            dp = DataProviderPtr_t(new Utf8DataProvider(data));
        }
    }
    catch (const UnsupportedFlavorException& e)
    {
        SAL_WARN("vcl.ios.clipboard",
                 "DataFlavorMapper::getDataProvider(): Exception: " << e.Message);
        // Somebody violates the contract of the clipboard
        // interface @see XTransferable
    }

    return dp;
}

DataProviderPtr_t DataFlavorMapper::getDataProvider(const NSString* systemFlavor,
                                                    NSData* systemData)
{
    DataProviderPtr_t dp;

    if (systemData == nil)
        return dp;

    if ([systemFlavor caseInsensitiveCompare:PBTYPE_UTF8PLAINTEXT] == NSOrderedSame)
    {
        dp = DataProviderPtr_t(new Utf8DataProvider(systemData));
    }
    else if ([systemFlavor caseInsensitiveCompare:PBTYPE_HTML] == NSOrderedSame)
    {
        dp = DataProviderPtr_t(new HTMLFormatDataProvider(systemData));
    }
    else
    {
        dp = DataProviderPtr_t(new ByteSequenceDataProvider(systemData));
    }

    return dp;
}

bool DataFlavorMapper::isValidMimeContentType(const OUString& contentType) const
{
    bool result = true;

    try
    {
        Reference<XMimeContentType> xCntType(mrXMimeCntFactory->createMimeContentType(contentType));
    }
    catch (const IllegalArgumentException& e)
    {
        SAL_WARN("vcl.ios.clipboard",
                 "DataFlavorMapper::isValidMimeContentType(): Exception: " << e.Message);
        result = false;
    }

    return result;
}

NSArray* DataFlavorMapper::flavorSequenceToTypesArray(
    const css::uno::Sequence<css::datatransfer::DataFlavor>& flavors) const
{
    const sal_uInt32 nFlavors = flavors.getLength();
    NSMutableArray* array = [[NSMutableArray alloc] initWithCapacity:1];

    bool bNeedDummyInternalFlavor(false);

    for (sal_uInt32 i = 0; i < nFlavors; i++)
    {
        if (flavors[i].MimeType.startsWith("image/bmp"))
        {
            [array addObject:PBTYPE_PNG];
        }
        else
        {
            const NSString* str = openOfficeToSystemFlavor(flavors[i], bNeedDummyInternalFlavor);

            if (str != nil)
            {
                [str retain];
                [array addObject:str];
            }
        }
    }

    return [array autorelease];
}

css::uno::Sequence<css::datatransfer::DataFlavor>
DataFlavorMapper::typesArrayToFlavorSequence(NSArray* types) const
{
    int nFormats = [types count];
    Sequence<DataFlavor> flavors;

    for (int i = 0; i < nFormats; i++)
    {
        NSString* sysFormat = [types objectAtIndex:i];
        DataFlavor oOOFlavor = systemToOpenOfficeFlavor(sysFormat);

        if (isValidFlavor(oOOFlavor))
        {
            flavors.realloc(flavors.getLength() + 1);
            flavors.getArray()[flavors.getLength() - 1] = oOOFlavor;
            SAL_INFO("vcl.ios.clipboard",
                     "Mapped " << [sysFormat UTF8String] << " to " << oOOFlavor.MimeType);
        }
        else
        {
            SAL_INFO("vcl.ios.clipboard",
                     "Was not able to map " << [sysFormat UTF8String] << " to an internal flavour");
        }
    }

    return flavors;
}

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