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      1 /*
      2  * Copyright (C) 2006, 2007, 2008 Apple 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
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "core/dom/Clipboard.h"
     28 
     29 #include "core/fileapi/FileList.h"
     30 #include "core/loader/cache/ImageResource.h"
     31 
     32 namespace WebCore {
     33 
     34 Clipboard::Clipboard(ClipboardAccessPolicy policy, ClipboardType clipboardType)
     35     : m_policy(policy)
     36     , m_dropEffect("uninitialized")
     37     , m_effectAllowed("uninitialized")
     38     , m_dragStarted(false)
     39     , m_clipboardType(clipboardType)
     40     , m_dragImage(0)
     41 {
     42     ScriptWrappable::init(this);
     43 }
     44 
     45 void Clipboard::setAccessPolicy(ClipboardAccessPolicy policy)
     46 {
     47     // once you go numb, can never go back
     48     ASSERT(m_policy != ClipboardNumb || policy == ClipboardNumb);
     49     m_policy = policy;
     50 }
     51 
     52 bool Clipboard::canReadTypes() const
     53 {
     54     return m_policy == ClipboardReadable || m_policy == ClipboardTypesReadable || m_policy == ClipboardWritable;
     55 }
     56 
     57 bool Clipboard::canReadData() const
     58 {
     59     return m_policy == ClipboardReadable || m_policy == ClipboardWritable;
     60 }
     61 
     62 bool Clipboard::canWriteData() const
     63 {
     64     return m_policy == ClipboardWritable;
     65 }
     66 
     67 bool Clipboard::canSetDragImage() const
     68 {
     69     return m_policy == ClipboardImageWritable || m_policy == ClipboardWritable;
     70 }
     71 
     72 // These "conversion" methods are called by both WebCore and WebKit, and never make sense to JS, so we don't
     73 // worry about security for these. They don't allow access to the pasteboard anyway.
     74 
     75 static DragOperation dragOpFromIEOp(const String& op)
     76 {
     77     // yep, it's really just this fixed set
     78     if (op == "uninitialized")
     79         return DragOperationEvery;
     80     if (op == "none")
     81         return DragOperationNone;
     82     if (op == "copy")
     83         return DragOperationCopy;
     84     if (op == "link")
     85         return DragOperationLink;
     86     if (op == "move")
     87         return (DragOperation)(DragOperationGeneric | DragOperationMove);
     88     if (op == "copyLink")
     89         return (DragOperation)(DragOperationCopy | DragOperationLink);
     90     if (op == "copyMove")
     91         return (DragOperation)(DragOperationCopy | DragOperationGeneric | DragOperationMove);
     92     if (op == "linkMove")
     93         return (DragOperation)(DragOperationLink | DragOperationGeneric | DragOperationMove);
     94     if (op == "all")
     95         return DragOperationEvery;
     96     return DragOperationPrivate;  // really a marker for "no conversion"
     97 }
     98 
     99 static String IEOpFromDragOp(DragOperation op)
    100 {
    101     bool moveSet = !!((DragOperationGeneric | DragOperationMove) & op);
    102 
    103     if ((moveSet && (op & DragOperationCopy) && (op & DragOperationLink))
    104         || (op == DragOperationEvery))
    105         return "all";
    106     if (moveSet && (op & DragOperationCopy))
    107         return "copyMove";
    108     if (moveSet && (op & DragOperationLink))
    109         return "linkMove";
    110     if ((op & DragOperationCopy) && (op & DragOperationLink))
    111         return "copyLink";
    112     if (moveSet)
    113         return "move";
    114     if (op & DragOperationCopy)
    115         return "copy";
    116     if (op & DragOperationLink)
    117         return "link";
    118     return "none";
    119 }
    120 
    121 DragOperation Clipboard::sourceOperation() const
    122 {
    123     DragOperation op = dragOpFromIEOp(m_effectAllowed);
    124     ASSERT(op != DragOperationPrivate);
    125     return op;
    126 }
    127 
    128 DragOperation Clipboard::destinationOperation() const
    129 {
    130     DragOperation op = dragOpFromIEOp(m_dropEffect);
    131     ASSERT(op == DragOperationCopy || op == DragOperationNone || op == DragOperationLink || op == (DragOperation)(DragOperationGeneric | DragOperationMove) || op == DragOperationEvery);
    132     return op;
    133 }
    134 
    135 void Clipboard::setSourceOperation(DragOperation op)
    136 {
    137     ASSERT_ARG(op, op != DragOperationPrivate);
    138     m_effectAllowed = IEOpFromDragOp(op);
    139 }
    140 
    141 void Clipboard::setDestinationOperation(DragOperation op)
    142 {
    143     ASSERT_ARG(op, op == DragOperationCopy || op == DragOperationNone || op == DragOperationLink || op == DragOperationGeneric || op == DragOperationMove || op == (DragOperation)(DragOperationGeneric | DragOperationMove));
    144     m_dropEffect = IEOpFromDragOp(op);
    145 }
    146 
    147 bool Clipboard::hasFileOfType(const String& type) const
    148 {
    149     if (!canReadTypes())
    150         return false;
    151 
    152     RefPtr<FileList> fileList = files();
    153     if (fileList->isEmpty())
    154         return false;
    155 
    156     for (unsigned int f = 0; f < fileList->length(); f++) {
    157         if (equalIgnoringCase(fileList->item(f)->type(), type))
    158             return true;
    159     }
    160     return false;
    161 }
    162 
    163 bool Clipboard::hasStringOfType(const String& type) const
    164 {
    165     if (!canReadTypes())
    166         return false;
    167 
    168     return types().contains(type);
    169 }
    170 
    171 void Clipboard::setDropEffect(const String &effect)
    172 {
    173     if (!isForDragAndDrop())
    174         return;
    175 
    176     // The attribute must ignore any attempts to set it to a value other than none, copy, link, and move.
    177     if (effect != "none" && effect != "copy"  && effect != "link" && effect != "move")
    178         return;
    179 
    180     // FIXME: The spec actually allows this in all circumstances, even though there's no point in
    181     // setting the drop effect when this condition is not true.
    182     if (canReadTypes())
    183         m_dropEffect = effect;
    184 }
    185 
    186 void Clipboard::setEffectAllowed(const String &effect)
    187 {
    188     if (!isForDragAndDrop())
    189         return;
    190 
    191     if (dragOpFromIEOp(effect) == DragOperationPrivate) {
    192         // This means that there was no conversion, and the effectAllowed that
    193         // we are passed isn't a valid effectAllowed, so we should ignore it,
    194         // and not set m_effectAllowed.
    195 
    196         // The attribute must ignore any attempts to set it to a value other than
    197         // none, copy, copyLink, copyMove, link, linkMove, move, all, and uninitialized.
    198         return;
    199     }
    200 
    201 
    202     if (canWriteData())
    203         m_effectAllowed = effect;
    204 }
    205 
    206 DragOperation convertDropZoneOperationToDragOperation(const String& dragOperation)
    207 {
    208     if (dragOperation == "copy")
    209         return DragOperationCopy;
    210     if (dragOperation == "move")
    211         return DragOperationMove;
    212     if (dragOperation == "link")
    213         return DragOperationLink;
    214     return DragOperationNone;
    215 }
    216 
    217 String convertDragOperationToDropZoneOperation(DragOperation operation)
    218 {
    219     switch (operation) {
    220     case DragOperationCopy:
    221         return String("copy");
    222     case DragOperationMove:
    223         return String("move");
    224     case DragOperationLink:
    225         return String("link");
    226     default:
    227         return String("copy");
    228     }
    229 }
    230 
    231 bool Clipboard::hasDropZoneType(const String& keyword)
    232 {
    233     if (keyword.startsWith("file:"))
    234         return hasFileOfType(keyword.substring(5));
    235 
    236     if (keyword.startsWith("string:"))
    237         return hasStringOfType(keyword.substring(7));
    238 
    239     return false;
    240 }
    241 
    242 } // namespace WebCore
    243