/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/**
 * Copyright (C) 2013 Regents of the University of California.
 * @author: Yingdi Yu <yingdi@cs.ucla.edu>
 * See COPYING for copyright and distribution information.
 */

#ifndef NDN_SECURITY_VALIDATOR_REGEX_HPP
#define NDN_SECURITY_VALIDATOR_REGEX_HPP

#include "validator.hpp"
#include "identity-certificate.hpp"
#include "sec-rule-relative.hpp"
#include "certificate-cache.hpp"
#include "../util/regex.hpp"

namespace ndn {

class ValidatorRegex : public Validator
{
public:
  class Error : public Validator::Error
  {
  public:
    explicit
    Error(const std::string& what)
      : Validator::Error(what)
    {
    }
  };

  static const shared_ptr<CertificateCache> DEFAULT_CERTIFICATE_CACHE;

  ValidatorRegex(shared_ptr<Face> face,
                 shared_ptr<CertificateCache> certificateCache = DEFAULT_CERTIFICATE_CACHE,
                 const int stepLimit = 3);

  virtual
  ~ValidatorRegex()
  {
  }

  /**
   * @brief Add a rule for data verification.
   *
   * @param policy The verification rule
   */
  inline void
  addDataVerificationRule(shared_ptr<SecRuleRelative> rule);

  /**
   * @brief Add a trust anchor
   *
   * @param certificate The trust anchor
   */
  inline void
  addTrustAnchor(shared_ptr<IdentityCertificate> certificate);

protected:
  virtual void
  checkPolicy(const Data& data,
              int stepCount,
              const OnDataValidated& onValidated,
              const OnDataValidationFailed& onValidationFailed,
              std::vector<shared_ptr<ValidationRequest> >& nextSteps);

  virtual void
  checkPolicy(const Interest& interest,
              int stepCount,
              const OnInterestValidated& onValidated,
              const OnInterestValidationFailed& onValidationFailed,
              std::vector<shared_ptr<ValidationRequest> >& nextSteps)
  {
    onValidationFailed(interest.shared_from_this(), "No policy for signed interest checking");
  }

  void
  onCertificateValidated(const shared_ptr<const Data>& signCertificate,
                         const shared_ptr<const Data>& data,
                         const OnDataValidated& onValidated,
                         const OnDataValidationFailed& onValidationFailed);

  void
  onCertificateValidationFailed(const shared_ptr<const Data>& signCertificate,
                                const std::string& failureInfo,
                                const shared_ptr<const Data>& data,
                                const OnDataValidationFailed& onValidationFailed);

protected:
  typedef std::vector< shared_ptr<SecRuleRelative> > RuleList;
  typedef std::vector< shared_ptr<Regex> > RegexList;

  int m_stepLimit;
  shared_ptr<CertificateCache> m_certificateCache;
  RuleList m_mustFailVerify;
  RuleList m_verifyPolicies;
  std::map<Name, shared_ptr<IdentityCertificate> > m_trustAnchors;
};

inline void
ValidatorRegex::addDataVerificationRule(shared_ptr<SecRuleRelative> rule)
{
  rule->isPositive() ? m_verifyPolicies.push_back(rule) : m_mustFailVerify.push_back(rule);
}

inline void
ValidatorRegex::addTrustAnchor(shared_ptr<IdentityCertificate> certificate)
{
  m_trustAnchors[certificate->getName().getPrefix(-1)] = certificate;
}

} // namespace ndn

#endif //NDN_SECURITY_VALIDATOR_REGEX_HPP