AllowedHosts.h

// AllowedHosts.h
 
// -*- mode: c++; c-basic-offset:4 -*-
 
// This file is part of the OPeNDAP Back-End Server (BES)
// and creates a set of allowed hosts that may be
// accessed by the server as part of its routine operation.
 
// Copyright (c) 2018 OPeNDAP, Inc.
// Author: Nathan D. Potter <ndp@opendap.org>
//
// This 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 2.1 of the License, or (at your option) any later version.
//
// This 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 a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
 
// Authors:
//      ndp       Nathan D. Potter <ndp@opendap.org>
 
#ifndef I_AllowedHosts_H
#define I_AllowedHosts_H 1
 
#include <string>
#include <vector>
 
#include "url_impl.h"
 
#define ALLOWED_HOSTS_BES_KEY "AllowedHosts"
 
namespace http {

class AllowedHosts {
private:
    std::vector<std::string> d_allowed_hosts;
 
    bool check(const std::string &url) const;
 
    // Private constructor to prevent direct instantiation
    AllowedHosts();
public:
    AllowedHosts(const AllowedHosts &) = delete;
    AllowedHosts &operator=(const AllowedHosts &) = delete;
 
    virtual ~AllowedHosts() = default;
 
    // Static member function that returns the pointer to the singleton instance
    static AllowedHosts *theHosts();
 
    bool is_allowed(const http::url &candidate_url);
    bool is_allowed(const http::url &candidate_url, std::string &whynot);
 
    bool is_allowed(const std::shared_ptr<http::url> &candidate_url);
    bool is_allowed(const std::shared_ptr<http::url> &candidate_url, std::string &whynot);
};
 
} // namespace bes
 
#endif // I_AllowedHosts_H