1/*
2 * Copyright (C) 2013 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
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. ``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 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 "HTMLResourcePreloader.h"
28
29#include "CachedResourceLoader.h"
30#include "Document.h"
31
32#include "MediaList.h"
33#include "MediaQueryEvaluator.h"
34#include "RenderView.h"
35
36namespace WebCore {
37
38bool PreloadRequest::isSafeToSendToAnotherThread() const
39{
40    return m_initiator.isSafeToSendToAnotherThread()
41        && m_charset.isSafeToSendToAnotherThread()
42        && m_resourceURL.isSafeToSendToAnotherThread()
43        && m_mediaAttribute.isSafeToSendToAnotherThread()
44        && m_baseURL.isSafeToSendToAnotherThread();
45}
46
47URL PreloadRequest::completeURL(Document& document)
48{
49    return document.completeURL(m_resourceURL, m_baseURL.isEmpty() ? document.url() : m_baseURL);
50}
51
52CachedResourceRequest PreloadRequest::resourceRequest(Document& document)
53{
54    ASSERT(isMainThread());
55    CachedResourceRequest request(ResourceRequest(completeURL(document)));
56    request.setInitiator(m_initiator);
57
58    // FIXME: It's possible CORS should work for other request types?
59    if (m_resourceType == CachedResource::Script)
60        request.mutableResourceRequest().setAllowCookies(m_crossOriginModeAllowsCookies);
61    return request;
62}
63
64void HTMLResourcePreloader::preload(PreloadRequestStream requests)
65{
66    for (auto& request : requests)
67        preload(WTF::move(request));
68}
69
70static bool mediaAttributeMatches(Frame* frame, RenderStyle* renderStyle, const String& attributeValue)
71{
72    RefPtr<MediaQuerySet> mediaQueries = MediaQuerySet::createAllowingDescriptionSyntax(attributeValue);
73    MediaQueryEvaluator mediaQueryEvaluator("screen", frame, renderStyle);
74    return mediaQueryEvaluator.eval(mediaQueries.get());
75}
76
77void HTMLResourcePreloader::preload(std::unique_ptr<PreloadRequest> preload)
78{
79    ASSERT(m_document.frame());
80    ASSERT(m_document.renderView());
81    if (!preload->media().isEmpty() && !mediaAttributeMatches(m_document.frame(), &m_document.renderView()->style(), preload->media()))
82        return;
83
84    CachedResourceRequest request = preload->resourceRequest(m_document);
85    m_document.cachedResourceLoader()->preload(preload->resourceType(), request, preload->charset());
86}
87
88
89}
90