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      1 /*
      2  * Copyright (C) 2011 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "DataTransferItemChromium.h"
     33 
     34 #if ENABLE(DATA_TRANSFER_ITEMS)
     35 
     36 #include "Blob.h"
     37 #include "Clipboard.h"
     38 #include "ClipboardMimeTypes.h"
     39 #include "PlatformBridge.h"
     40 #include "SharedBuffer.h"
     41 #include "StringCallback.h"
     42 
     43 namespace WebCore {
     44 
     45 PassRefPtr<DataTransferItemChromium> DataTransferItemChromium::createFromPasteboard(PassRefPtr<Clipboard> owner, ScriptExecutionContext* context, const String& type)
     46 {
     47     if (type == mimeTypeTextPlain || type == mimeTypeTextHTML)
     48         return adoptRef(new DataTransferItemChromium(owner, context, PasteboardSource, DataTransferItem::kindString, type, ""));
     49     return adoptRef(new DataTransferItemChromium(owner, context, PasteboardSource, DataTransferItem::kindFile, type, ""));
     50 }
     51 
     52 PassRefPtr<DataTransferItemChromium> DataTransferItemChromium::create(PassRefPtr<Clipboard> owner,
     53                                                                       ScriptExecutionContext* context,
     54                                                                       const String& data,
     55                                                                       const String& type)
     56 {
     57     return adoptRef(new DataTransferItemChromium(owner, context, InternalSource, DataTransferItem::kindString, type, data));
     58 }
     59 
     60 DataTransferItemChromium::DataTransferItemChromium(PassRefPtr<Clipboard> owner, ScriptExecutionContext* context, DataSource source, const String& kind, const String& type, const String& data)
     61     : m_owner(owner)
     62     , m_context(context)
     63     , m_source(source)
     64     , m_kind(kind)
     65     , m_type(type)
     66     , m_data(data)
     67 {
     68 }
     69 
     70 String DataTransferItemChromium::kind() const
     71 {
     72     if (m_owner->policy() == ClipboardNumb)
     73         return String();
     74     return m_kind;
     75 }
     76 
     77 String DataTransferItemChromium::type() const
     78 {
     79     if (m_owner->policy() == ClipboardNumb)
     80         return String();
     81     return m_type;
     82 }
     83 
     84 void DataTransferItemChromium::getAsString(PassRefPtr<StringCallback> callback)
     85 {
     86     if ((m_owner->policy() != ClipboardReadable && m_owner->policy() != ClipboardWritable)
     87         || m_kind != kindString)
     88         return;
     89     if (m_source == InternalSource) {
     90         callback->scheduleCallback(m_context, m_data);
     91         return;
     92     }
     93 
     94     ASSERT(m_source == PasteboardSource);
     95     // This is ugly but there's no real alternative.
     96     if (m_type == mimeTypeTextPlain) {
     97         callback->scheduleCallback(m_context, PlatformBridge::clipboardReadPlainText(PasteboardPrivate::StandardBuffer));
     98         return;
     99     }
    100     if (m_type == mimeTypeTextHTML) {
    101         String html;
    102         KURL ignoredSourceURL;
    103         PlatformBridge::clipboardReadHTML(PasteboardPrivate::StandardBuffer, &html, &ignoredSourceURL);
    104         callback->scheduleCallback(m_context, html);
    105         return;
    106     }
    107     ASSERT_NOT_REACHED();
    108 }
    109 
    110 PassRefPtr<Blob> DataTransferItemChromium::getAsFile()
    111 {
    112     if (m_source == InternalSource)
    113         return 0;
    114 
    115     ASSERT(m_source == PasteboardSource);
    116     if (m_type == mimeTypeImagePng) {
    117         // FIXME: This is pretty inefficient. We copy the data from the browser
    118         // to the renderer. We then place it in a blob in WebKit, which
    119         // registers it and copies it *back* to the browser. When a consumer
    120         // wants to read the data, we then copy the data back into the renderer.
    121         // https://bugs.webkit.org/show_bug.cgi?id=58107 has been filed to track
    122         // improvements to this code (in particular, add a registerClipboardBlob
    123         // method to the blob registry; that way the data is only copied over
    124         // into the renderer when it's actually read, not when the blob is
    125         // initially constructed).
    126         RefPtr<SharedBuffer> data = PlatformBridge::clipboardReadImage(PasteboardPrivate::StandardBuffer);
    127         RefPtr<RawData> rawData = RawData::create();
    128         rawData->mutableData()->append(data->data(), data->size());
    129         OwnPtr<BlobData> blobData = BlobData::create();
    130         blobData->appendData(rawData, 0, -1);
    131         blobData->setContentType(mimeTypeImagePng);
    132         return Blob::create(blobData.release(), data->size());
    133     }
    134     return 0;
    135 }
    136 
    137 } // namespace WebCore
    138 
    139 #endif // ENABLE(DATA_TRANSFER_ITEMS)
    140