WorkerShadowFetchContext

third_party/WebKit/Source/core/loader/appcache/ApplicationCacheHost.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 47 matching lines @@
 namespace blink {
 
 // We provide a custom implementation of this class that calls out to the
 // embedding application instead of using WebCore's built in appcache system.
 // This file replaces webcore/appcache/ApplicationCacheHost.cpp in our build.
 
 ApplicationCacheHost::ApplicationCacheHost(DocumentLoader* document_loader)
     : dom_application_cache_(nullptr),
       document_loader_(document_loader),
       defers_events_(true) {
-  DCHECK(document_loader_);
 }
 
 ApplicationCacheHost::~ApplicationCacheHost() {
   // Verify that detachFromDocumentLoader() has been performed already.
   DCHECK(!host_);
 }
 
 void ApplicationCacheHost::WillStartLoading(ResourceRequest& request) {
   if (!IsApplicationCacheEnabled())
     return;
 
   if (request.GetFrameType() == WebURLRequest::kFrameTypeTopLevel ||
       request.GetFrameType() == WebURLRequest::kFrameTypeNested) {
     WillStartLoadingMainResource(request);
   } else {
     WillStartLoadingResource(request);
   }
 }
 
 void ApplicationCacheHost::WillStartLoadingMainResource(
     ResourceRequest& request) {
   // We defer creating the outer host object to avoid spurious
   // creation/destruction around creating empty documents. At this point, we're
   // initiating a main resource load for the document, so its for real.
 
   DCHECK(IsApplicationCacheEnabled());
 
-  DCHECK(document_loader_->GetFrame());
-  LocalFrame& frame = *document_loader_->GetFrame();
-  host_ = frame.Loader().Client()->CreateApplicationCacheHost(this);
-  if (!host_)
-    return;
+  if (!host_) {
+    DCHECK(document_loader_->GetFrame());
+    LocalFrame& frame = *document_loader_->GetFrame();
+    host_ = frame.Loader().Client()->CreateApplicationCacheHost(this);
+    if (!host_)
+      return;
+  }
 
   WrappedResourceRequest wrapped(request);
 
   const WebApplicationCacheHost* spawning_host = nullptr;
-  Frame* spawning_frame = frame.Tree().Parent();
-  if (!spawning_frame || !spawning_frame->IsLocalFrame())
-    spawning_frame = frame.Loader().Opener();
-  if (!spawning_frame || !spawning_frame->IsLocalFrame())
-    spawning_frame = &frame;
-  if (DocumentLoader* spawning_doc_loader =
-          ToLocalFrame(spawning_frame)->Loader().GetDocumentLoader()) {
-    spawning_host =
-        spawning_doc_loader->GetApplicationCacheHost()
-            ? spawning_doc_loader->GetApplicationCacheHost()->host_.get()
-            : nullptr;
+  if (document_loader_) {
+    DCHECK(document_loader_->GetFrame());
+    LocalFrame& frame = *document_loader_->GetFrame();
+    Frame* spawning_frame = frame.Tree().Parent();
+    if (!spawning_frame || !spawning_frame->IsLocalFrame())
+      spawning_frame = frame.Loader().Opener();
+    if (!spawning_frame || !spawning_frame->IsLocalFrame())
+      spawning_frame = &frame;
+    if (DocumentLoader* spawning_doc_loader =
+            ToLocalFrame(spawning_frame)->Loader().GetDocumentLoader()) {
+      spawning_host =
+          spawning_doc_loader->GetApplicationCacheHost()
+              ? spawning_doc_loader->GetApplicationCacheHost()->host_.get()
+              : nullptr;
+    }
   }
 
   host_->WillStartMainResourceRequest(wrapped, spawning_host);
 
   // NOTE: The semantics of this method, and others in this interface, are
   // subtly different than the method names would suggest. For example, in this
   // method never returns an appcached response in the SubstituteData out
   // argument, instead we return the appcached response thru the usual resource
   // loading pipeline.
 }
@@ skipping 185 matching lines @@
   }
   return success;
 }
 
 void ApplicationCacheHost::Abort() {
   if (host_)
     host_->Abort();
 }
 
 bool ApplicationCacheHost::IsApplicationCacheEnabled() {
-  DCHECK(document_loader_->GetFrame());
+  DCHECK(host_ || document_loader_->GetFrame());
+  if (host_)
+    return true;
   return document_loader_->GetFrame()->GetSettings() &&
          document_loader_->GetFrame()
              ->GetSettings()
              ->GetOfflineWebApplicationCacheEnabled();
 }
 
 void ApplicationCacheHost::DidChangeCacheAssociation() {
   // FIXME: Prod the inspector to update its notion of what cache the page is
   // using.
 }
@@ skipping 21 matching lines @@
   NotifyApplicationCache(kErrorEvent, 0, 0, reason, url.GetString(), status,
                          message);
 }
 
 DEFINE_TRACE(ApplicationCacheHost) {
   visitor->Trace(dom_application_cache_);
   visitor->Trace(document_loader_);
 }
 
 }  // namespace blink