1 files changed, 99 insertions, 0 deletions
diff --git a/uriloader/preload/FetchPreloader.h b/uriloader/preload/FetchPreloader.h
new file mode 100644
index 0000000000..f501a79c97
--- /dev/null
+++ b/uriloader/preload/FetchPreloader.h
@@ -0,0 +1,99 @@
+/* -*- 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/. */
+
+#ifndef FetchPreloader_h_
+#define FetchPreloader_h_
+
+#include "mozilla/PreloaderBase.h"
+#include "mozilla/Variant.h"
+#include "nsCOMPtr.h"
+#include "nsIAsyncOutputStream.h"
+#include "nsIAsyncInputStream.h"
+#include "nsIContentPolicy.h"
+#include "nsIStreamListener.h"
+
+class nsIChannel;
+class nsILoadGroup;
+class nsIInterfaceRequestor;
+
+namespace mozilla {
+
+namespace dom {
+enum class ReferrerPolicy : uint8_t;
+}
+
+class FetchPreloader : public PreloaderBase, public nsIStreamListener {
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIREQUESTOBSERVER
+  NS_DECL_NSISTREAMLISTENER
+
+  FetchPreloader();
+  nsresult OpenChannel(const PreloadHashKey& aKey, nsIURI* aURI,
+                       const CORSMode aCORSMode,
+                       const dom::ReferrerPolicy& aReferrerPolicy,
+                       dom::Document* aDocument);
+
+  // PreloaderBase
+  nsresult AsyncConsume(nsIStreamListener* aListener) override;
+  static void PrioritizeAsPreload(nsIChannel* aChannel);
+  void PrioritizeAsPreload() override;
+
+ protected:
+  explicit FetchPreloader(nsContentPolicyType aContentPolicyType);
+  virtual ~FetchPreloader() = default;
+
+  // Create and setup the channel with necessary security properties.  This is
+  // overridable by subclasses to allow different initial conditions.
+  virtual nsresult CreateChannel(nsIChannel** aChannel, nsIURI* aURI,
+                                 const CORSMode aCORSMode,
+                                 const dom::ReferrerPolicy& aReferrerPolicy,
+                                 dom::Document* aDocument,
+                                 nsILoadGroup* aLoadGroup,
+                                 nsIInterfaceRequestor* aCallbacks);
+
+ private:
+  nsresult CheckContentPolicy(nsIURI* aURI, dom::Document* aDocument);
+
+  class Cache final : public nsIStreamListener {
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIREQUESTOBSERVER
+    NS_DECL_NSISTREAMLISTENER
+
+    void AsyncConsume(nsIStreamListener* aListener);
+    void Consume(nsCOMPtr<nsIStreamListener> aListener);
+
+   private:
+    virtual ~Cache() = default;
+
+    struct StartRequest {};
+    struct DataAvailable {
+      nsCString mData;
+    };
+    struct StopRequest {
+      nsresult mStatus;
+    };
+
+    typedef Variant<StartRequest, DataAvailable, StopRequest> Call;
+    nsCOMPtr<nsIRequest> mRequest;
+    nsCOMPtr<nsIStreamListener> mFinalListener;
+    nsTArray<Call> mCalls;
+  };
+
+  // The listener passed to AsyncConsume in case we haven't started getting the
+  // data from the channel yet.
+  nsCOMPtr<nsIStreamListener> mConsumeListener;
+
+  // Returned by AsyncConsume when a failure.  This remembers the result of
+  // opening the channel and prevents duplicate consumation.
+  nsresult mAsyncConsumeResult = NS_ERROR_NOT_AVAILABLE;
+
+  // The CP type to check against.  Derived classes have to override call to CSP
+  // constructor of this class.
+  nsContentPolicyType mContentPolicyType;
+};
+
+}  // namespace mozilla
+
+#endif