[NotLanded] Implement the fetching algorithm of the Web Manifest.

Source/core/fetch/ResourceFetcher.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
     Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
@@ skipping 78 matching lines @@
     case Resource::Script:
         return new ScriptResource(request, charset);
     case Resource::SVGDocument:
         return new DocumentResource(request, Resource::SVGDocument);
     case Resource::Font:
         return new FontResource(request);
     case Resource::MainResource:
     case Resource::Raw:
     case Resource::TextTrack:
     case Resource::Media:
+    case Resource::ImportResource:
         return new RawResource(request, type);
     case Resource::XSLStyleSheet:
         return new XSLStyleSheetResource(request, charset);
     case Resource::LinkPrefetch:
-        return new Resource(request, Resource::LinkPrefetch);
     case Resource::LinkSubresource:
-        return new Resource(request, Resource::LinkSubresource);
-    case Resource::ImportResource:
-        return new RawResource(request, type);
+    case Resource::Manifest:
+        return new Resource(request, type);
     }
 
     ASSERT_NOT_REACHED();
     return 0;
 }
 
 static ResourceLoadPriority loadPriority(Resource::Type type, const FetchRequest& request)
 {
     if (request.priority() != ResourceLoadPriorityUnresolved)
         return request.priority();
 
     switch (type) {
     case Resource::MainResource:
         return ResourceLoadPriorityVeryHigh;
     case Resource::CSSStyleSheet:
         return ResourceLoadPriorityHigh;
     case Resource::Raw:
         return request.options().synchronousPolicy == RequestSynchronously ? ResourceLoadPriorityVeryHigh : ResourceLoadPriorityMedium;
     case Resource::Script:
     case Resource::Font:
     case Resource::ImportResource:
+    case Resource::Manifest:
         return ResourceLoadPriorityMedium;
     case Resource::Image:
         // We'll default images to VeryLow, and promote whatever is visible. This improves
         // speed-index by ~5% on average, ~14% at the 99th percentile.
         return ResourceLoadPriorityVeryLow;
     case Resource::Media:
         return ResourceLoadPriorityLow;
     case Resource::XSLStyleSheet:
         ASSERT(RuntimeEnabledFeatures::xsltEnabled());
         return ResourceLoadPriorityHigh;
@@ skipping 72 matching lines @@
     case Resource::Image:
         return WebURLRequest::RequestContextImage;
     case Resource::Raw:
         return WebURLRequest::RequestContextSubresource;
     case Resource::ImportResource:
         return WebURLRequest::RequestContextImport;
     case Resource::LinkPrefetch:
         return WebURLRequest::RequestContextPrefetch;
     case Resource::LinkSubresource:
         return WebURLRequest::RequestContextSubresource;
+    case Resource::Manifest:
+        return WebURLRequest::RequestContextManifest;
     case Resource::TextTrack:
         return WebURLRequest::RequestContextTrack;
     case Resource::SVGDocument:
         return WebURLRequest::RequestContextImage;
     case Resource::Media: // TODO: Split this.
         return WebURLRequest::RequestContextVideo;
     }
     ASSERT_NOT_REACHED();
     return WebURLRequest::RequestContextSubresource;
 }
@@ skipping 175 matching lines @@
     return toRawResource(requestResource(Resource::Media, request));
 }
 
 ResourcePtr<RawResource> ResourceFetcher::fetchTextTrack(FetchRequest& request)
 {
     ASSERT(request.resourceRequest().frameType() == WebURLRequest::FrameTypeNone);
     request.mutableResourceRequest().setRequestContext(WebURLRequest::RequestContextTrack);
     return toRawResource(requestResource(Resource::TextTrack, request));
 }
 
+ResourcePtr<Resource> ResourceFetcher::fetchManifest(FetchRequest& request)
+{
+    ASSERT(request.resourceRequest().frameType() == WebURLRequest::FrameTypeNone);
+    request.mutableResourceRequest().setRequestContext(WebURLRequest::RequestContextManifest);
+    return requestResource(Resource::Manifest, request);
+}
+
 void ResourceFetcher::preCacheSubstituteDataForMainResource(const FetchRequest& request, const SubstituteData& substituteData)
 {
     const KURL& url = request.url();
     if (Resource* oldResource = memoryCache()->resourceForURL(url))
         memoryCache()->remove(oldResource);
 
     ResourceResponse response(url, substituteData.mimeType(), substituteData.content()->size(), substituteData.textEncoding(), emptyString());
     ResourcePtr<Resource> resource = createResource(Resource::MainResource, request.resourceRequest(), substituteData.textEncoding());
     resource->setNeedsSynchronousCacheHit(substituteData.forceSynchronousLoad());
     resource->setOptions(request.options());
     resource->setDataBufferingPolicy(BufferData);
     resource->responseReceived(response);
     if (substituteData.content()->size())
         resource->setResourceBuffer(substituteData.content());
     resource->finish();
     memoryCache()->add(resource.get());
 }
 
 bool ResourceFetcher::checkInsecureContent(Resource::Type type, const KURL& url, MixedContentBlockingTreatment treatment) const
 {
     if (treatment == TreatAsDefaultForType) {
         switch (type) {
+        // Blockable content list is defined here:
+        // http://w3c.github.io/webappsec/specs/mixedcontent/#category-blockable
         case Resource::XSLStyleSheet:
             ASSERT(RuntimeEnabledFeatures::xsltEnabled());
         case Resource::Script:
         case Resource::SVGDocument:
         case Resource::CSSStyleSheet:
         case Resource::ImportResource:
             // These resource can inject script into the current document (Script,
             // XSL) or exfiltrate the content of the current document (CSS).
             treatment = TreatAsActiveContent;
             break;
 
         case Resource::Font:
+        case Resource::Manifest:
         case Resource::TextTrack:
             // These resources are passive, but mixed usage is low enough that we
             // can block them in a mixed context.
             treatment = TreatAsActiveContent;
             break;
 
         case Resource::Raw:
         case Resource::Image:
         case Resource::Media:
             // These resources can corrupt only the frame's pixels.
@@ skipping 63 matching lines @@
     case Resource::Image:
     case Resource::CSSStyleSheet:
     case Resource::Script:
     case Resource::Font:
     case Resource::Raw:
     case Resource::LinkPrefetch:
     case Resource::LinkSubresource:
     case Resource::TextTrack:
     case Resource::ImportResource:
     case Resource::Media:
+    case Resource::Manifest:
         // By default these types of resources can be loaded from any origin.
         // FIXME: Are we sure about Resource::Font?
         if (originRestriction == FetchRequest::RestrictToSameOrigin && !securityOrigin->canRequest(url)) {
             printAccessDeniedMessage(url);
             return false;
         }
         break;
     case Resource::XSLStyleSheet:
         ASSERT(RuntimeEnabledFeatures::xsltEnabled());
     case Resource::SVGDocument:
@@ skipping 49 matching lines @@
         break;
     case Resource::Font: {
         if (!shouldBypassMainWorldCSP && !csp->allowFontFromSource(url, cspReporting))
             return false;
         break;
     }
     case Resource::MainResource:
     case Resource::Raw:
     case Resource::LinkPrefetch:
     case Resource::LinkSubresource:
+    case Resource::Manifest:
         break;
     case Resource::Media:
     case Resource::TextTrack:
         if (!shouldBypassMainWorldCSP && !csp->allowMediaFromSource(url, cspReporting))
             return false;
 
         if (frame()) {
             if (!frame()->loader().client()->allowMedia(url))
                 return false;
         }
@@ skipping 941 matching lines @@
 
 void ResourceFetcher::trace(Visitor* visitor)
 {
     visitor->trace(m_document);
     visitor->trace(m_loaders);
     visitor->trace(m_multipartLoaders);
     ResourceLoaderHost::trace(visitor);
 }
 
 }