Line data    Source code

       1             : /*
       2             :  *  Copyright (C) 2004-2024 Savoir-faire Linux Inc.
       3             :  *  Author: Adrien Béraud <adrien.beraud@savoirfairelinux.com>
       4             :  *          Vsevolod Ivanov <vsevolod.ivanov@savoirfairelinux.com>
       5             :  *
       6             :  *  This program is free software; you can redistribute it and/or modify
       7             :  *  it under the terms of the GNU General Public License as published by
       8             :  *  the Free Software Foundation; either version 3 of the License, or
       9             :  *  (at your option) any later version.
      10             :  *
      11             :  *  This library is distributed in the hope that it will be useful,
      12             :  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :  *  Lesser General Public License for more details.
      15             :  *
      16             :  *  You should have received a copy of the GNU General Public License
      17             :  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
      18             :  */
      19             : #pragma once
      20             : 
      21             : #include "noncopyable.h"
      22             : 
      23             : #include <asio/io_context.hpp>
      24             : 
      25             : #include <functional>
      26             : #include <map>
      27             : #include <set>
      28             : #include <string>
      29             : #include <mutex>
      30             : #include <memory>
      31             : #include <thread>
      32             : #include <filesystem>
      33             : 
      34             : namespace dht {
      35             : class Executor;
      36             : namespace crypto {
      37             : struct PublicKey;
      38             : }
      39             : namespace http {
      40             : class Request;
      41             : struct Response;
      42             : class Resolver;
      43             : } // namespace http
      44             : namespace log {
      45             : struct Logger;
      46             : }
      47             : using Logger = log::Logger;
      48             : } // namespace dht
      49             : 
      50             : namespace jami {
      51             : 
      52             : class Task;
      53             : 
      54             : class NameDirectory
      55             : {
      56             : public:
      57             :     enum class Response : int { found = 0, invalidResponse, notFound, error };
      58             :     enum class RegistrationResponse : int {
      59             :         success = 0,
      60             :         invalidName,
      61             :         invalidCredentials,
      62             :         alreadyTaken,
      63             :         error,
      64             :         incompleteRequest,
      65             :         signatureVerificationFailed,
      66             :         unsupported
      67             :     };
      68             : 
      69             :     using LookupCallback = std::function<void(const std::string& result, Response response)>;
      70             :     using SearchResult = std::vector<std::map<std::string, std::string>>;
      71             :     using SearchCallback = std::function<void(const SearchResult& result, Response response)>;
      72             :     using RegistrationCallback = std::function<void(RegistrationResponse response)>;
      73             : 
      74             :     NameDirectory(const std::string& serverUrl, std::shared_ptr<dht::Logger> l = {});
      75             :     ~NameDirectory();
      76             :     void load();
      77             : 
      78             :     static NameDirectory& instance(const std::string& serverUrl,
      79             :                                    std::shared_ptr<dht::Logger> l = {});
      80             :     static NameDirectory& instance();
      81             : 
      82           0 :     void setToken(std::string token) { serverToken_ = std::move(token); }
      83             : 
      84             :     static void lookupUri(std::string_view uri,
      85             :                           const std::string& default_server,
      86             :                           LookupCallback cb);
      87             : 
      88             :     void lookupAddress(const std::string& addr, LookupCallback cb);
      89             :     void lookupName(const std::string& name, LookupCallback cb);
      90             :     bool searchName(const std::string& /*name*/, SearchCallback /*cb*/) { return false; }
      91             : 
      92             :     void registerName(const std::string& addr,
      93             :                       const std::string& name,
      94             :                       const std::string& owner,
      95             :                       RegistrationCallback cb,
      96             :                       const std::string& signedname,
      97             :                       const std::string& publickey);
      98             : 
      99             : private:
     100             :     NON_COPYABLE(NameDirectory);
     101             :     NameDirectory(NameDirectory&&) = delete;
     102             :     NameDirectory& operator=(NameDirectory&&) = delete;
     103             : 
     104             :     std::string serverUrl_;
     105             :     std::string serverToken_;
     106             :     std::filesystem::path cachePath_;
     107             : 
     108             :     std::mutex cacheLock_ {};
     109             :     std::shared_ptr<dht::Logger> logger_;
     110             : 
     111             :     /*
     112             :      * ASIO I/O Context for sockets in httpClient_.
     113             :      * Note: Each context is used in one thread only.
     114             :      */
     115             :     std::shared_ptr<asio::io_context> httpContext_;
     116             :     std::shared_ptr<dht::http::Resolver> resolver_;
     117             :     std::mutex requestsMtx_ {};
     118             :     std::set<std::shared_ptr<dht::http::Request>> requests_;
     119             : 
     120             :     std::map<std::string, std::string> nameCache_ {};
     121             :     std::map<std::string, std::string> addrCache_ {};
     122             : 
     123             :     std::weak_ptr<Task> saveTask_;
     124             : 
     125             :     void setHeaderFields(dht::http::Request& request);
     126             : 
     127         782 :     std::string nameCache(const std::string& addr)
     128             :     {
     129         782 :         std::lock_guard l(cacheLock_);
     130         782 :         auto cacheRes = nameCache_.find(addr);
     131        1564 :         return cacheRes != nameCache_.end() ? cacheRes->second : std::string {};
     132         782 :     }
     133           3 :     std::string addrCache(const std::string& name)
     134             :     {
     135           3 :         std::lock_guard l(cacheLock_);
     136           3 :         auto cacheRes = addrCache_.find(name);
     137           6 :         return cacheRes != addrCache_.end() ? cacheRes->second : std::string {};
     138           3 :     }
     139             : 
     140             :     bool validateName(const std::string& name) const;
     141             :     static bool verify(const std::string& name,
     142             :                        const dht::crypto::PublicKey& publickey,
     143             :                        const std::string& signature);
     144             : 
     145             :     void scheduleCacheSave();
     146             :     void saveCache();
     147             :     void loadCache();
     148             : };
     149             : } // namespace jami