1/*
2 * Copyright (C) 2017 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 INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include "Decoder.h"
29#include "Encoder.h"
30#include "SandboxExtension.h"
31#include <WebCore/FormData.h>
32
33namespace IPC {
34
35class FormDataReference {
36public:
37 FormDataReference() = default;
38 explicit FormDataReference(RefPtr<WebCore::FormData>&& data)
39 : m_data(WTFMove(data))
40 {
41 }
42
43 RefPtr<WebCore::FormData> takeData() { return WTFMove(m_data); }
44
45 void encode(Encoder& encoder) const
46 {
47 encoder << !!m_data;
48 if (!m_data)
49 return;
50
51 encoder << *m_data;
52
53 auto& elements = m_data->elements();
54 size_t fileCount = std::count_if(elements.begin(), elements.end(), [](auto& element) {
55 return WTF::holds_alternative<WebCore::FormDataElement::EncodedFileData>(element.data);
56 });
57
58 WebKit::SandboxExtension::HandleArray sandboxExtensionHandles;
59 sandboxExtensionHandles.allocate(fileCount);
60 size_t extensionIndex = 0;
61 for (auto& element : elements) {
62 if (auto* fileData = WTF::get_if<WebCore::FormDataElement::EncodedFileData>(element.data)) {
63 const String& path = fileData->shouldGenerateFile ? fileData->generatedFilename : fileData->filename;
64 WebKit::SandboxExtension::createHandle(path, WebKit::SandboxExtension::Type::ReadOnly, sandboxExtensionHandles[extensionIndex++]);
65 }
66 }
67 encoder << sandboxExtensionHandles;
68 }
69
70 static Optional<FormDataReference> decode(Decoder& decoder)
71 {
72 Optional<bool> hasFormData;
73 decoder >> hasFormData;
74 if (!hasFormData)
75 return WTF::nullopt;
76 if (!hasFormData.value())
77 return FormDataReference { };
78
79 auto formData = WebCore::FormData::decode(decoder);
80 if (!formData)
81 return WTF::nullopt;
82
83 Optional<WebKit::SandboxExtension::HandleArray> sandboxExtensionHandles;
84 decoder >> sandboxExtensionHandles;
85 if (!sandboxExtensionHandles)
86 return WTF::nullopt;
87
88 for (size_t i = 0; i < sandboxExtensionHandles->size(); ++i)
89 WebKit::SandboxExtension::consumePermanently(sandboxExtensionHandles->at(i));
90
91 return FormDataReference { formData.releaseNonNull() };
92 }
93
94private:
95 RefPtr<WebCore::FormData> m_data;
96};
97
98} // namespace IPC
99