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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 "Clipboard.h"
     28 
     29 #include "CachedImage.h"
     30 #include "Frame.h"
     31 #include "FrameLoader.h"
     32 #include "Image.h"
     33 
     34 namespace WebCore {
     35 
     36 Clipboard::Clipboard(ClipboardAccessPolicy policy, ClipboardType clipboardType)
     37     : m_policy(policy)
     38     , m_dropEffect("uninitialized")
     39     , m_effectAllowed("uninitialized")
     40     , m_dragStarted(false)
     41     , m_clipboardType(clipboardType)
     42     , m_dragImage(0)
     43 {
     44 }
     45 
     46 void Clipboard::setAccessPolicy(ClipboardAccessPolicy policy)
     47 {
     48     // once you go numb, can never go back
     49     ASSERT(m_policy != ClipboardNumb || policy == ClipboardNumb);
     50     m_policy = policy;
     51 }
     52 
     53 // These "conversion" methods are called by both WebCore and WebKit, and never make sense to JS, so we don't
     54 // worry about security for these. They don't allow access to the pasteboard anyway.
     55 
     56 static DragOperation dragOpFromIEOp(const String& op)
     57 {
     58     // yep, it's really just this fixed set
     59     if (op == "uninitialized")
     60         return DragOperationEvery;
     61     if (op == "none")
     62         return DragOperationNone;
     63     if (op == "copy")
     64         return DragOperationCopy;
     65     if (op == "link")
     66         return DragOperationLink;
     67     if (op == "move")
     68         return (DragOperation)(DragOperationGeneric | DragOperationMove);
     69     if (op == "copyLink")
     70         return (DragOperation)(DragOperationCopy | DragOperationLink);
     71     if (op == "copyMove")
     72         return (DragOperation)(DragOperationCopy | DragOperationGeneric | DragOperationMove);
     73     if (op == "linkMove")
     74         return (DragOperation)(DragOperationLink | DragOperationGeneric | DragOperationMove);
     75     if (op == "all")
     76         return DragOperationEvery;
     77     return DragOperationPrivate;  // really a marker for "no conversion"
     78 }
     79 
     80 static String IEOpFromDragOp(DragOperation op)
     81 {
     82     bool moveSet = !!((DragOperationGeneric | DragOperationMove) & op);
     83 
     84     if ((moveSet && (op & DragOperationCopy) && (op & DragOperationLink))
     85         || (op == DragOperationEvery))
     86         return "all";
     87     if (moveSet && (op & DragOperationCopy))
     88         return "copyMove";
     89     if (moveSet && (op & DragOperationLink))
     90         return "linkMove";
     91     if ((op & DragOperationCopy) && (op & DragOperationLink))
     92         return "copyLink";
     93     if (moveSet)
     94         return "move";
     95     if (op & DragOperationCopy)
     96         return "copy";
     97     if (op & DragOperationLink)
     98         return "link";
     99     return "none";
    100 }
    101 
    102 DragOperation Clipboard::sourceOperation() const
    103 {
    104     DragOperation op = dragOpFromIEOp(m_effectAllowed);
    105     ASSERT(op != DragOperationPrivate);
    106     return op;
    107 }
    108 
    109 DragOperation Clipboard::destinationOperation() const
    110 {
    111     DragOperation op = dragOpFromIEOp(m_dropEffect);
    112     ASSERT(op == DragOperationCopy || op == DragOperationNone || op == DragOperationLink || op == (DragOperation)(DragOperationGeneric | DragOperationMove) || op == DragOperationEvery);
    113     return op;
    114 }
    115 
    116 void Clipboard::setSourceOperation(DragOperation op)
    117 {
    118     ASSERT_ARG(op, op != DragOperationPrivate);
    119     m_effectAllowed = IEOpFromDragOp(op);
    120 }
    121 
    122 void Clipboard::setDestinationOperation(DragOperation op)
    123 {
    124     ASSERT_ARG(op, op == DragOperationCopy || op == DragOperationNone || op == DragOperationLink || op == DragOperationGeneric || op == DragOperationMove || op == (DragOperation)(DragOperationGeneric | DragOperationMove));
    125     m_dropEffect = IEOpFromDragOp(op);
    126 }
    127 
    128 void Clipboard::setDropEffect(const String &effect)
    129 {
    130     if (!isForDragAndDrop())
    131         return;
    132 
    133     // The attribute must ignore any attempts to set it to a value other than none, copy, link, and move.
    134     if (effect != "none" && effect != "copy"  && effect != "link" && effect != "move")
    135         return;
    136 
    137     if (m_policy == ClipboardReadable || m_policy == ClipboardTypesReadable)
    138         m_dropEffect = effect;
    139 }
    140 
    141 void Clipboard::setEffectAllowed(const String &effect)
    142 {
    143     if (!isForDragAndDrop())
    144         return;
    145 
    146     if (dragOpFromIEOp(effect) == DragOperationPrivate) {
    147         // This means that there was no conversion, and the effectAllowed that
    148         // we are passed isn't a valid effectAllowed, so we should ignore it,
    149         // and not set m_effectAllowed.
    150 
    151         // The attribute must ignore any attempts to set it to a value other than
    152         // none, copy, copyLink, copyMove, link, linkMove, move, all, and uninitialized.
    153         return;
    154     }
    155 
    156 
    157     if (m_policy == ClipboardWritable)
    158         m_effectAllowed = effect;
    159 }
    160 
    161 } // namespace WebCore
    162