1 files changed, 167 insertions, 0 deletions
diff --git a/image/ImageCacheKey.cpp b/image/ImageCacheKey.cpp
new file mode 100644
index 000000000..da194fa55
--- /dev/null
+++ b/image/ImageCacheKey.cpp
@@ -0,0 +1,167 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ImageCacheKey.h"
+
+#include "mozilla/Move.h"
+#include "File.h"
+#include "ImageURL.h"
+#include "nsHostObjectProtocolHandler.h"
+#include "nsString.h"
+#include "mozilla/dom/workers/ServiceWorkerManager.h"
+#include "nsIDocument.h"
+#include "nsPrintfCString.h"
+
+namespace mozilla {
+
+using namespace dom;
+
+namespace image {
+
+bool
+URISchemeIs(ImageURL* aURI, const char* aScheme)
+{
+  bool schemeMatches = false;
+  if (NS_WARN_IF(NS_FAILED(aURI->SchemeIs(aScheme, &schemeMatches)))) {
+    return false;
+  }
+  return schemeMatches;
+}
+
+static Maybe<uint64_t>
+BlobSerial(ImageURL* aURI)
+{
+  nsAutoCString spec;
+  aURI->GetSpec(spec);
+
+  RefPtr<BlobImpl> blob;
+  if (NS_SUCCEEDED(NS_GetBlobForBlobURISpec(spec, getter_AddRefs(blob))) &&
+      blob) {
+    return Some(blob->GetSerialNumber());
+  }
+
+  return Nothing();
+}
+
+ImageCacheKey::ImageCacheKey(nsIURI* aURI,
+                             const PrincipalOriginAttributes& aAttrs,
+                             nsIDocument* aDocument,
+                             nsresult& aRv)
+  : mURI(new ImageURL(aURI, aRv))
+  , mOriginAttributes(aAttrs)
+  , mControlledDocument(GetControlledDocumentToken(aDocument))
+  , mIsChrome(URISchemeIs(mURI, "chrome"))
+{
+  NS_ENSURE_SUCCESS_VOID(aRv);
+
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (URISchemeIs(mURI, "blob")) {
+    mBlobSerial = BlobSerial(mURI);
+  }
+
+  mHash = ComputeHash(mURI, mBlobSerial, mOriginAttributes, mControlledDocument);
+}
+
+ImageCacheKey::ImageCacheKey(ImageURL* aURI,
+                             const PrincipalOriginAttributes& aAttrs,
+                             nsIDocument* aDocument)
+  : mURI(aURI)
+  , mOriginAttributes(aAttrs)
+  , mControlledDocument(GetControlledDocumentToken(aDocument))
+  , mIsChrome(URISchemeIs(mURI, "chrome"))
+{
+  MOZ_ASSERT(aURI);
+
+  if (URISchemeIs(mURI, "blob")) {
+    mBlobSerial = BlobSerial(mURI);
+  }
+
+  mHash = ComputeHash(mURI, mBlobSerial, mOriginAttributes, mControlledDocument);
+}
+
+ImageCacheKey::ImageCacheKey(const ImageCacheKey& aOther)
+  : mURI(aOther.mURI)
+  , mBlobSerial(aOther.mBlobSerial)
+  , mOriginAttributes(aOther.mOriginAttributes)
+  , mControlledDocument(aOther.mControlledDocument)
+  , mHash(aOther.mHash)
+  , mIsChrome(aOther.mIsChrome)
+{ }
+
+ImageCacheKey::ImageCacheKey(ImageCacheKey&& aOther)
+  : mURI(Move(aOther.mURI))
+  , mBlobSerial(Move(aOther.mBlobSerial))
+  , mOriginAttributes(aOther.mOriginAttributes)
+  , mControlledDocument(aOther.mControlledDocument)
+  , mHash(aOther.mHash)
+  , mIsChrome(aOther.mIsChrome)
+{ }
+
+bool
+ImageCacheKey::operator==(const ImageCacheKey& aOther) const
+{
+  // Don't share the image cache between a controlled document and anything else.
+  if (mControlledDocument != aOther.mControlledDocument) {
+    return false;
+  }
+  // The origin attributes always have to match.
+  if (mOriginAttributes != aOther.mOriginAttributes) {
+    return false;
+  }
+  if (mBlobSerial || aOther.mBlobSerial) {
+    // If at least one of us has a blob serial, just compare the blob serial and
+    // the ref portion of the URIs.
+    return mBlobSerial == aOther.mBlobSerial &&
+           mURI->HasSameRef(*aOther.mURI);
+  }
+
+  // For non-blob URIs, compare the URIs.
+  return *mURI == *aOther.mURI;
+}
+
+const char*
+ImageCacheKey::Spec() const
+{
+  return mURI->Spec();
+}
+
+/* static */ uint32_t
+ImageCacheKey::ComputeHash(ImageURL* aURI,
+                           const Maybe<uint64_t>& aBlobSerial,
+                           const PrincipalOriginAttributes& aAttrs,
+                           void* aControlledDocument)
+{
+  // Since we frequently call Hash() several times in a row on the same
+  // ImageCacheKey, as an optimization we compute our hash once and store it.
+
+  nsPrintfCString ptr("%p", aControlledDocument);
+  nsAutoCString suffix;
+  aAttrs.CreateSuffix(suffix);
+
+  return AddToHash(0, aURI->ComputeHash(aBlobSerial),
+                   HashString(suffix), HashString(ptr));
+}
+
+/* static */ void*
+ImageCacheKey::GetControlledDocumentToken(nsIDocument* aDocument)
+{
+  // For non-controlled documents, we just return null.  For controlled
+  // documents, we cast the pointer into a void* to avoid dereferencing
+  // it (since we only use it for comparisons), and return it.
+  void* pointer = nullptr;
+  using dom::workers::ServiceWorkerManager;
+  RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
+  if (aDocument && swm) {
+    ErrorResult rv;
+    if (swm->IsControlled(aDocument, rv)) {
+      pointer = aDocument;
+    }
+  }
+  return pointer;
+}
+
+} // namespace image
+} // namespace mozilla