pdns/json.cc

   1 /*
   2  * This file is part of PowerDNS or dnsdist.
   3  * Copyright -- PowerDNS.COM B.V. and its contributors
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * In addition, for the avoidance of any doubt, permission is granted to
  10  * link this program with OpenSSL and to (re)distribute the binaries
  11  * produced as the result of such linking.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25 #include "json.hh"
  26 #include "namespaces.hh"
  27 #include "misc.hh"
  28
  29 using json11::Json;
  30
  31 static inline int intFromJsonInternal(const Json& container, const std::string& key, const bool have_default, const int default_value)
  32 {
  33   const auto& val = container[key];
  34   if (val.is_number()) {
  35     return val.int_value();
  36   }
  37
  38   if (val.is_string()) {
  39     try {
  40       return std::stoi(val.string_value());
  41     } catch (std::out_of_range&) {
  42       throw JsonException("Key '" + string(key) + "' is out of range");
  43     }
  44   }
  45
  46   if (have_default) {
  47     return default_value;
  48   }
  49   throw JsonException("Key '" + string(key) + "' not an Integer or not present");
  50 }
  51
  52 int intFromJson(const Json& container, const std::string& key)
  53 {
  54   return intFromJsonInternal(container, key, false, 0);
  55 }
  56
  57 int intFromJson(const Json& container, const std::string& key, const int default_value)
  58 {
  59   return intFromJsonInternal(container, key, true, default_value);
  60 }
  61
  62 static inline unsigned int uintFromJsonInternal(const Json& container, const std::string& key, const bool have_default, const unsigned int default_value)
  63 {
  64   int intval = intFromJsonInternal(container, key, have_default, static_cast<int>(default_value));
  65   if (intval >= 0) {
  66     return intval;
  67   }
  68   throw JsonException("Key '" + string(key) + "' is not a positive Integer");
  69 }
  70
  71 unsigned int uintFromJson(const Json& container, const std::string& key)
  72 {
  73   return uintFromJsonInternal(container, key, false, 0);
  74 }
  75
  76 unsigned int uintFromJson(const Json& container, const std::string& key, const unsigned int default_value)
  77 {
  78   return uintFromJsonInternal(container, key, true, default_value);
  79 }
  80
  81 static inline double doubleFromJsonInternal(const Json& container, const std::string& key, const bool have_default, const double default_value)
  82 {
  83   const auto& val = container[key];
  84   if (val.is_number()) {
  85     return val.number_value();
  86   }
  87
  88   if (val.is_string()) {
  89     try {
  90       return std::stod(val.string_value());
  91     } catch (std::out_of_range&) {
  92       throw JsonException("Value for key '" + string(key) + "' is out of range");
  93     }
  94   }
  95
  96   if (have_default) {
  97     return default_value;
  98   }
  99   throw JsonException("Key '" + string(key) + "' not an Integer or not present");
 100 }
 101
 102 double doubleFromJson(const Json& container, const std::string& key)
 103 {
 104   return doubleFromJsonInternal(container, key, false, 0);
 105 }
 106
 107 double doubleFromJson(const Json& container, const std::string& key, const double default_value)
 108 {
 109   return doubleFromJsonInternal(container, key, true, default_value);
 110 }
 111
 112 string stringFromJson(const Json& container, const std::string &key)
 113 {
 114   const auto& val = container[key];
 115   if (val.is_string()) {
 116     return val.string_value();
 117   }
 118   throw JsonException("Key '" + string(key) + "' not present or not a String");
 119 }
 120
 121 static inline bool boolFromJsonInternal(const Json& container, const std::string& key, const bool have_default, const bool default_value)
 122 {
 123   const auto& val = container[key];
 124   if (val.is_bool()) {
 125     return val.bool_value();
 126   }
 127   if (have_default) {
 128     return default_value;
 129   }
 130   throw JsonException("Key '" + string(key) + "' not present or not a Bool");
 131 }
 132
 133 bool boolFromJson(const Json& container, const std::string& key)
 134 {
 135   return boolFromJsonInternal(container, key, false, false);
 136 }
 137
 138 bool boolFromJson(const Json& container, const std::string& key, const bool default_value)
 139 {
 140   return boolFromJsonInternal(container, key, true, default_value);
 141 }