Add TrustStoreNSS and TrustStoreCollection

net/cert/internal/trust_store_collection.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef NET_CERT_INTERNAL_TRUST_STORE_COLLECTION_H_
+#define NET_CERT_INTERNAL_TRUST_STORE_COLLECTION_H_
+
+#include "base/memory/ref_counted.h"
+#include "net/base/net_export.h"
+#include "net/cert/internal/trust_store.h"
+
+namespace base {
+class TaskRunner;
+}
+
+namespace net {
+
+// TrustStoreCollection is an implementation of TrustStore which combines the
+// results from multiple TrustStores.
+//
+// The synchronous matches will be in order from the primary store, and then
+// from the secondary stores in the order they were added to the
+// TrustStoreCollection.
+//
+// Currently only one "primary" store can be added that supports async queries,
+// any number of additional, synchronous-only stores can be used. (The
+// assumption is that the async one would be useful for OS integration, while
+// the sync only stores can be used for supplying additional anchors. If
+// multiple async stores are desired, it might be worth changing the
+// FindTrustAnchorsForCert interface so that it can return async results in
+// multiple batches.)
+class NET_EXPORT TrustStoreCollection : public TrustStore {
+ public:
+  TrustStoreCollection();
+  ~TrustStoreCollection() override;
+
+  // Includes results from |store| in the combined output. Both sync and async
+  // queries to |store| will be allowed. |store| must outlive the
+  // TrustStoreCollection.
+  void SetPrimaryTrustStore(TrustStore* store);
+
+  // Includes results from |store| in the combined output. |store| will only be
+  // queried synchronously. |store| must outlive the TrustStoreCollection.
+  void AddTrustStoreSynchronousOnly(TrustStore* store);
+
+  // TrustStore implementation:
+  void FindTrustAnchorsForCert(
+      const scoped_refptr<ParsedCertificate>& cert,
+      const TrustAnchorsCallback& callback,
+      TrustAnchors* synchronous_matches,
+      std::unique_ptr<Request>* out_req) const override;
+
+ private:
+  TrustStore* primary_store_ = nullptr;
+  std::vector<TrustStore*> sync_only_stores_;
+
+  DISALLOW_COPY_AND_ASSIGN(TrustStoreCollection);
+};
+
+}  // namespace net
+
+#endif  // NET_CERT_INTERNAL_TRUST_STORE_COLLECTION_H_