granicus.if.org Git - icinga2/blob - lib/icinga/macroprocessor.cpp

   1 /******************************************************************************
   2  * Icinga 2                                                                   *
   3  * Copyright (C) 2012 Icinga Development Team (http://www.icinga.org/)        *
   4  *                                                                            *
   5  * This program is free software; you can redistribute it and/or              *
   6  * modify it under the terms of the GNU General Public License                *
   7  * as published by the Free Software Foundation; either version 2             *
   8  * of the License, or (at your option) any later version.                     *
   9  *                                                                            *
  10  * This program is distributed in the hope that it will be useful,            *
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of             *
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              *
  13  * GNU General Public License for more details.                               *
  14  *                                                                            *
  15  * You should have received a copy of the GNU General Public License          *
  16  * along with this program; if not, write to the Free Software Foundation     *
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.             *
  18  ******************************************************************************/
  19
  20 #include "icinga/macroprocessor.h"
  21 #include "icinga/macroresolver.h"
  22 #include "base/utility.h"
  23 #include "base/array.h"
  24 #include "base/objectlock.h"
  25 #include "base/logger_fwd.h"
  26 #include <boost/tuple/tuple.hpp>
  27 #include <boost/smart_ptr/make_shared.hpp>
  28 #include <boost/foreach.hpp>
  29
  30 using namespace icinga;
  31
  32 Value MacroProcessor::ResolveMacros(const Value& str, const std::vector<MacroResolver::Ptr>& resolvers,
  33     const Dictionary::Ptr& cr, const MacroProcessor::EscapeCallback& escapeFn)
  34 {
  35         Value result;
  36
  37         if (str.IsScalar()) {
  38                 result = InternalResolveMacros(str, resolvers, cr, escapeFn);
  39         } else if (str.IsObjectType<Array>()) {
  40                 Array::Ptr resultArr = boost::make_shared<Array>();
  41                 Array::Ptr arr = str;
  42
  43                 ObjectLock olock(arr);
  44
  45                 BOOST_FOREACH(const Value& arg, arr) {
  46                         /* Note: don't escape macros here. */
  47                         resultArr->Add(InternalResolveMacros(arg, resolvers, cr, EscapeCallback()));
  48                 }
  49
  50                 result = resultArr;
  51         } else {
  52                 BOOST_THROW_EXCEPTION(std::invalid_argument("Command is not a string or array."));
  53         }
  54
  55         return result;
  56 }
  57
  58 bool MacroProcessor::ResolveMacro(const String& macro, const std::vector<MacroResolver::Ptr>& resolvers,
  59     const Dictionary::Ptr& cr, String *result)
  60 {
  61         BOOST_FOREACH(const MacroResolver::Ptr& resolver, resolvers) {
  62                 if (resolver->ResolveMacro(macro, cr, result))
  63                         return true;
  64         }
  65
  66         return false;
  67 }
  68
  69
  70 String MacroProcessor::InternalResolveMacros(const String& str, const std::vector<MacroResolver::Ptr>& resolvers,
  71     const Dictionary::Ptr& cr, const MacroProcessor::EscapeCallback& escapeFn)
  72 {
  73         size_t offset, pos_first, pos_second;
  74         offset = 0;
  75
  76         String result = str;
  77         while ((pos_first = result.FindFirstOf("$", offset)) != String::NPos) {
  78                 pos_second = result.FindFirstOf("$", pos_first + 1);
  79
  80                 if (pos_second == String::NPos)
  81                         BOOST_THROW_EXCEPTION(std::runtime_error("Closing $ not found in macro format string."));
  82
  83                 String name = result.SubStr(pos_first + 1, pos_second - pos_first - 1);
  84
  85                 String resolved_macro;
  86                 bool found = ResolveMacro(name, resolvers, cr, &resolved_macro);
  87
  88                 /* $$ is an escape sequence for $. */
  89                 if (name.IsEmpty()) {
  90                         resolved_macro = "$";
  91                         found = true;
  92                 }
  93
  94                 if (!found)
  95                         Log(LogWarning, "icinga", "Macro '" + name + "' is not defined.");
  96
  97                 result.Replace(pos_first, pos_second - pos_first + 1, resolved_macro);
  98                 offset = pos_first + resolved_macro.GetLength();
  99         }
 100
 101         return result;
 102 }