security: Convert ValidatorConfig to ValidationPolicyConfig

The security API also provides a convenience ValidatorConfig helper.

Change-Id: Ic86dec4904b917361cb4740204de4b6710d2a386
Refs: #3920
diff --git a/src/security/v2/validation-policy-config.hpp b/src/security/v2/validation-policy-config.hpp
new file mode 100644
index 0000000..7690cc1
--- /dev/null
+++ b/src/security/v2/validation-policy-config.hpp
@@ -0,0 +1,99 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2013-2017 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library 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 Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ */
+
+#ifndef NDN_SECURITY_V2_VALIDATION_POLICY_CONFIG_HPP
+#define NDN_SECURITY_V2_VALIDATION_POLICY_CONFIG_HPP
+
+#include "validation-policy.hpp"
+#include "validator-config/rule.hpp"
+#include "validator-config/common.hpp"
+
+namespace ndn {
+namespace security {
+namespace v2 {
+namespace validator_config {
+
+/**
+ * @brief The validator which can be set up via a configuration file.
+ *
+ * @note For command Interest validation, this policy must be combined with
+ *       @p ValidationPolicyCommandInterest, in order to guard against replay attacks.
+ * @note This policy does not support inner policies (a sole policy or a terminal inner policy)
+ * @sa https://named-data.net/doc/ndn-cxx/current/tutorials/security-validator-config.html
+ */
+class ValidationPolicyConfig : public ValidationPolicy
+{
+public:
+  ValidationPolicyConfig();
+
+  void
+  load(const std::string& filename);
+
+  void
+  load(const std::string& input, const std::string& filename);
+
+  void
+  load(std::istream& input, const std::string& filename);
+
+  void
+  load(const ConfigSection& configSection, const std::string& filename);
+
+protected:
+  void
+  checkPolicy(const Data& data, const shared_ptr<ValidationState>& state,
+              const ValidationContinuation& continueValidation) override;
+
+  void
+  checkPolicy(const Interest& interest, const shared_ptr<ValidationState>& state,
+              const ValidationContinuation& continueValidation) override;
+
+private:
+  void
+  processConfigTrustAnchor(const ConfigSection& section, const std::string& filename);
+
+  time::nanoseconds
+  getRefreshPeriod(ConfigSection::const_iterator& it, const ConfigSection::const_iterator& end);
+
+  time::nanoseconds
+  getDefaultRefreshPeriod();
+
+NDN_CXX_PUBLIC_WITH_TESTS_ELSE_PRIVATE:
+  /** @brief whether to always bypass validation
+   *
+   *  This is set to true when 'any' is specified as a trust anchor.
+   *  It causes all packets to bypass validation.
+   */
+  bool m_shouldBypass;
+  bool m_isConfigured;
+
+  std::vector<unique_ptr<Rule>> m_dataRules;
+  std::vector<unique_ptr<Rule>> m_interestRules;
+};
+
+} // namespace validator_config
+
+using validator_config::ValidationPolicyConfig;
+
+} // namespace v2
+} // namespace security
+} // namespace ndn
+
+#endif // NDN_SECURITY_V2_VALIDATION_POLICY_CONFIG_HPP