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
34namespace WebCore {
35
36Clipboard::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
46void 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
56static 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
80static 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
102DragOperation Clipboard::sourceOperation() const
103{
104    DragOperation op = dragOpFromIEOp(m_effectAllowed);
105    ASSERT(op != DragOperationPrivate);
106    return op;
107}
108
109DragOperation 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
116void Clipboard::setSourceOperation(DragOperation op)
117{
118    ASSERT_ARG(op, op != DragOperationPrivate);
119    m_effectAllowed = IEOpFromDragOp(op);
120}
121
122void 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
128void 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
141void 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