security: Add permanent certificate storage for validator

refs: #2779

Change-Id: I5d9588136474b7eff3adf258a60aff0b7909bead
diff --git a/src/security/certificate-store.hpp b/src/security/certificate-store.hpp
new file mode 100644
index 0000000..5818aa5
--- /dev/null
+++ b/src/security/certificate-store.hpp
@@ -0,0 +1,73 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014-2015,  The University of Memphis,
+ *                           Regents of the University of California,
+ *                           Arizona Board of Regents.
+ *
+ * This file is part of NLSR (Named-data Link State Routing).
+ * See AUTHORS.md for complete list of NLSR authors and contributors.
+ *
+ * NLSR is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ *
+ * NLSR is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * NLSR, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+#ifndef NLSR_CERTIFICATE_STORE_HPP
+#define NLSR_CERTIFICATE_STORE_HPP
+
+#include "../common.hpp"
+#include "../test-access-control.hpp"
+
+#include <ndn-cxx/interest.hpp>
+#include <ndn-cxx/security/identity-certificate.hpp>
+
+namespace nlsr {
+namespace security {
+
+class CertificateStore
+{
+public:
+  void
+  insert(shared_ptr<ndn::IdentityCertificate> certificate)
+  {
+    if (certificate != nullptr) {
+      // Key is cert name without version
+      m_certificates[certificate->getName().getPrefix(-1)] = certificate;
+    }
+  }
+
+  shared_ptr<const ndn::IdentityCertificate>
+  find(const ndn::Name& certificateNameWithoutVersion) const
+  {
+    CertMap::const_iterator it = m_certificates.find(certificateNameWithoutVersion);
+
+    if (it != m_certificates.end()) {
+      return it->second;
+    }
+
+    return nullptr;
+  }
+
+PUBLIC_WITH_TESTS_ELSE_PRIVATE:
+  void
+  clear()
+  {
+    m_certificates.clear();
+  }
+
+private:
+  typedef std::map<ndn::Name, shared_ptr<ndn::IdentityCertificate>> CertMap;
+  CertMap m_certificates;
+};
+
+} // namespace security
+} // namespace nlsr
+
+#endif // NLSR_CERTIFICATE_STORE_HPP