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1 /* | 1 /* |
2 Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de) | 2 Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de) |
3 Copyright (C) 2001 Dirk Mueller (mueller@kde.org) | 3 Copyright (C) 2001 Dirk Mueller (mueller@kde.org) |
4 Copyright (C) 2002 Waldo Bastian (bastian@kde.org) | 4 Copyright (C) 2002 Waldo Bastian (bastian@kde.org) |
5 Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All | 5 Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All |
6 rights reserved. | 6 rights reserved. |
7 Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/ | 7 Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/ |
8 | 8 |
9 This library is free software; you can redistribute it and/or | 9 This library is free software; you can redistribute it and/or |
10 modify it under the terms of the GNU Library General Public | 10 modify it under the terms of the GNU Library General Public |
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757 ResourceFetcher::determineRevalidationPolicy(Resource::Type type, | 757 ResourceFetcher::determineRevalidationPolicy(Resource::Type type, |
758 const FetchRequest& fetchRequest, | 758 const FetchRequest& fetchRequest, |
759 Resource* existingResource, | 759 Resource* existingResource, |
760 bool isStaticData) const { | 760 bool isStaticData) const { |
761 const ResourceRequest& request = fetchRequest.resourceRequest(); | 761 const ResourceRequest& request = fetchRequest.resourceRequest(); |
762 | 762 |
763 if (!existingResource) | 763 if (!existingResource) |
764 return Load; | 764 return Load; |
765 | 765 |
766 // Checks if the resource has an explicit policy about integrity metadata. | 766 // Checks if the resource has an explicit policy about integrity metadata. |
767 // Currently only applies to ScriptResources. | |
768 // | 767 // |
769 // This is necessary because ScriptResource objects do not keep the raw data | 768 // This is necessary because ScriptResource and CSSStyleSheetResource objects |
770 // around after the source is accessed once, so if the resource is accessed | 769 // do not keep the raw data around after the source is accessed once, so if |
771 // from the MemoryCache for a second time, there is no way to redo an | 770 // the resource is accessed from the MemoryCache for a second time, there is |
772 // integrity check. | 771 // no way to redo an integrity check. |
773 // | 772 // |
774 // Thus, Blink implements a scheme where it caches the integrity information | 773 // Thus, Blink implements a scheme where it caches the integrity information |
775 // for a ScriptResource after the first time it is checked, and if there is | 774 // for those resources after the first time it is checked, and if there is |
776 // another request for that resource, with the same integrity metadata, Blink | 775 // another request for that resource, with the same integrity metadata, Blink |
777 // skips the integrity calculation. However, if the integrity metadata is a | 776 // skips the integrity calculation. However, if the integrity metadata is a |
778 // mismatch, the MemoryCache must be skipped here, and a new request for the | 777 // mismatch, the MemoryCache must be skipped here, and a new request for the |
779 // resource must be made to get the raw data. This is expected to be an | 778 // resource must be made to get the raw data. This is expected to be an |
780 // uncommon case, however, as it implies two same-origin requests to the same | 779 // uncommon case, however, as it implies two same-origin requests to the same |
781 // resource, but with different integrity metadata. | 780 // resource, but with different integrity metadata. |
782 RecordSriResourceIntegrityMismatchEvent(CheckingForIntegrityMismatch); | 781 RecordSriResourceIntegrityMismatchEvent(CheckingForIntegrityMismatch); |
783 if (existingResource->mustRefetchDueToIntegrityMetadata(fetchRequest)) { | 782 if (existingResource->mustRefetchDueToIntegrityMetadata(fetchRequest)) { |
784 RecordSriResourceIntegrityMismatchEvent(RefetchDueToIntegrityMismatch); | 783 RecordSriResourceIntegrityMismatchEvent(RefetchDueToIntegrityMismatch); |
785 return Reload; | 784 return Reload; |
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1592 visitor->trace(m_context); | 1591 visitor->trace(m_context); |
1593 visitor->trace(m_archive); | 1592 visitor->trace(m_archive); |
1594 visitor->trace(m_loaders); | 1593 visitor->trace(m_loaders); |
1595 visitor->trace(m_nonBlockingLoaders); | 1594 visitor->trace(m_nonBlockingLoaders); |
1596 visitor->trace(m_documentResources); | 1595 visitor->trace(m_documentResources); |
1597 visitor->trace(m_preloads); | 1596 visitor->trace(m_preloads); |
1598 visitor->trace(m_resourceTimingInfoMap); | 1597 visitor->trace(m_resourceTimingInfoMap); |
1599 } | 1598 } |
1600 | 1599 |
1601 } // namespace blink | 1600 } // namespace blink |
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