1 files changed, 142 insertions, 0 deletions
diff --git a/uriloader/preload/PreloadService.h b/uriloader/preload/PreloadService.h
new file mode 100644
index 0000000000..5f6566ea34
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+++ b/uriloader/preload/PreloadService.h
@@ -0,0 +1,142 @@
+/* -*- 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 PreloadService_h__
+#define PreloadService_h__
+
+#include "nsIContentPolicy.h"
+#include "nsIURI.h"
+#include "nsRefPtrHashtable.h"
+#include "mozilla/PreloadHashKey.h"
+
+class nsINode;
+
+namespace mozilla {
+
+class PreloaderBase;
+
+namespace dom {
+
+class HTMLLinkElement;
+class Document;
+enum class ReferrerPolicy : uint8_t;
+
+}  // namespace dom
+
+/**
+ * Intended to scope preloads
+ * (https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel/preload)
+ * and speculative loads initiated by the parser under one roof.  This class
+ * is intended to be a member of dom::Document. Provides registration of
+ * speculative loads via a `key` which is defined to consist of the URL,
+ * resource type, and resource-specific attributes that are further
+ * distinguishing loads with otherwise same type and url.
+ */
+class PreloadService {
+ public:
+  explicit PreloadService(dom::Document*);
+  ~PreloadService();
+
+  // Called by resource loaders to register a running resource load.  This is
+  // called for a speculative load when it's started the first time, being it
+  // either regular speculative load or a preload.
+  //
+  // Returns false and does nothing if a preload is already registered under
+  // this key, true otherwise.
+  bool RegisterPreload(const PreloadHashKey& aKey, PreloaderBase* aPreload);
+
+  // Called when the load is about to be cancelled.  Exact behavior is to be
+  // determined yet.
+  void DeregisterPreload(const PreloadHashKey& aKey);
+
+  // Called when the scope is to go away.
+  void ClearAllPreloads();
+
+  // True when there is a preload registered under the key.
+  bool PreloadExists(const PreloadHashKey& aKey);
+
+  // Returns an existing preload under the key or null, when there is none
+  // registered under the key.
+  already_AddRefed<PreloaderBase> LookupPreload(
+      const PreloadHashKey& aKey) const;
+
+  void SetSpeculationBase(nsIURI* aURI) { mSpeculationBaseURI = aURI; }
+  already_AddRefed<nsIURI> GetPreloadURI(const nsAString& aURL);
+
+  already_AddRefed<PreloaderBase> PreloadLinkElement(
+      dom::HTMLLinkElement* aLink, nsContentPolicyType aPolicyType);
+
+  // a non-zero aEarlyHintPreloaderId tells this service that a preload for this
+  // link was started by the EarlyHintPreloader and the preloaders should
+  // connect back by setting earlyHintPreloaderId in nsIChannelInternal before
+  // AsyncOpen.
+  void PreloadLinkHeader(nsIURI* aURI, const nsAString& aURL,
+                         nsContentPolicyType aPolicyType, const nsAString& aAs,
+                         const nsAString& aType, const nsAString& aNonce,
+                         const nsAString& aIntegrity, const nsAString& aSrcset,
+                         const nsAString& aSizes, const nsAString& aCORS,
+                         const nsAString& aReferrerPolicy,
+                         uint64_t aEarlyHintPreloaderId,
+                         const nsAString& aFetchPriority);
+
+  void PreloadScript(nsIURI* aURI, const nsAString& aType,
+                     const nsAString& aCharset, const nsAString& aCrossOrigin,
+                     const nsAString& aReferrerPolicy, const nsAString& aNonce,
+                     const nsAString& aFetchPriority,
+                     const nsAString& aIntegrity, bool aScriptFromHead,
+                     uint64_t aEarlyHintPreloaderId);
+
+  void PreloadImage(nsIURI* aURI, const nsAString& aCrossOrigin,
+                    const nsAString& aImageReferrerPolicy, bool aIsImgSet,
+                    uint64_t aEarlyHintPreloaderId);
+
+  void PreloadFont(nsIURI* aURI, const nsAString& aCrossOrigin,
+                   const nsAString& aReferrerPolicy,
+                   uint64_t aEarlyHintPreloaderId,
+                   const nsAString& aFetchPriority);
+
+  void PreloadFetch(nsIURI* aURI, const nsAString& aCrossOrigin,
+                    const nsAString& aReferrerPolicy,
+                    uint64_t aEarlyHintPreloaderId,
+                    const nsAString& aFetchPriority);
+
+  static void NotifyNodeEvent(nsINode* aNode, bool aSuccess);
+
+  void SetEarlyHintUsed() { mEarlyHintUsed = true; }
+  bool GetEarlyHintUsed() const { return mEarlyHintUsed; }
+
+ private:
+  dom::ReferrerPolicy PreloadReferrerPolicy(const nsAString& aReferrerPolicy);
+  nsIURI* BaseURIForPreload();
+
+  struct PreloadOrCoalesceResult {
+    RefPtr<PreloaderBase> mPreloader;
+    bool mAlreadyComplete;
+  };
+
+  PreloadOrCoalesceResult PreloadOrCoalesce(
+      nsIURI* aURI, const nsAString& aURL, nsContentPolicyType aPolicyType,
+      const nsAString& aAs, const nsAString& aType, const nsAString& aCharset,
+      const nsAString& aSrcset, const nsAString& aSizes,
+      const nsAString& aNonce, const nsAString& aIntegrity,
+      const nsAString& aCORS, const nsAString& aReferrerPolicy,
+      const nsAString& aFetchPriority, bool aFromHeader,
+      uint64_t aEarlyHintPreloaderId);
+
+ private:
+  nsRefPtrHashtable<PreloadHashKey, PreloaderBase> mPreloads;
+
+  // Raw pointer only, we are intended to be a direct member of dom::Document
+  dom::Document* mDocument;
+
+  // Set by `nsHtml5TreeOpExecutor::SetSpeculationBase`.
+  nsCOMPtr<nsIURI> mSpeculationBaseURI;
+
+  bool mEarlyHintUsed = false;
+};
+
+}  // namespace mozilla
+
+#endif