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

   1 /******************************************************************************
   2  * Icinga 2                                                                   *
   3  * Copyright (C) 2012-2014 Icinga Development Team (http://www.icinga.org)    *
   4  *                                                                            *
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   8  * of the License, or (at your option) any later version.                     *
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  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              *
  13  * GNU General Public License for more details.                               *
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  18  ******************************************************************************/
  19
  20 #include "icinga/macroprocessor.hpp"
  21 #include "icinga/macroresolver.hpp"
  22 #include "icinga/customvarobject.hpp"
  23 #include "base/array.hpp"
  24 #include "base/objectlock.hpp"
  25 #include "base/logger_fwd.hpp"
  26 #include "base/context.hpp"
  27 #include "base/dynamicobject.hpp"
  28 #include <boost/foreach.hpp>
  29 #include <boost/algorithm/string/split.hpp>
  30 #include <boost/algorithm/string/join.hpp>
  31 #include <boost/algorithm/string/classification.hpp>
  32
  33 using namespace icinga;
  34
  35 Value MacroProcessor::ResolveMacros(const Value& str, const ResolverList& resolvers,
  36     const CheckResult::Ptr& cr, String *missingMacro,
  37     const MacroProcessor::EscapeCallback& escapeFn)
  38 {
  39         Value result;
  40
  41         if (str.IsEmpty())
  42                 return Empty;
  43
  44         if (str.IsScalar()) {
  45                 result = InternalResolveMacros(str, resolvers, cr, missingMacro, escapeFn);
  46         } else if (str.IsObjectType<Array>()) {
  47                 Array::Ptr resultArr = make_shared<Array>();
  48                 Array::Ptr arr = str;
  49
  50                 ObjectLock olock(arr);
  51
  52                 BOOST_FOREACH(const Value& arg, arr) {
  53                         /* Note: don't escape macros here. */
  54                         resultArr->Add(InternalResolveMacros(arg, resolvers, cr, missingMacro, EscapeCallback()));
  55                 }
  56
  57                 result = resultArr;
  58         } else {
  59                 BOOST_THROW_EXCEPTION(std::invalid_argument("Command is not a string or array."));
  60         }
  61
  62         return result;
  63 }
  64
  65 bool MacroProcessor::ResolveMacro(const String& macro, const ResolverList& resolvers,
  66     const CheckResult::Ptr& cr, String *result, bool *recursive_macro)
  67 {
  68         CONTEXT("Resolving macro '" + macro + "'");
  69
  70         *recursive_macro = false;
  71
  72         std::vector<String> tokens;
  73         boost::algorithm::split(tokens, macro, boost::is_any_of("."));
  74
  75         String objName;
  76         if (tokens.size() > 1) {
  77                 objName = tokens[0];
  78                 tokens.erase(tokens.begin());
  79         }
  80
  81         BOOST_FOREACH(const ResolverSpec& resolver, resolvers) {
  82                 if (!objName.IsEmpty() && objName != resolver.first)
  83                         continue;
  84
  85                 if (objName.IsEmpty()) {
  86                         CustomVarObject::Ptr dobj = dynamic_pointer_cast<CustomVarObject>(resolver.second);
  87
  88                         if (dobj) {
  89                                 Dictionary::Ptr vars = dobj->GetVars();
  90
  91                                 if (vars && vars->Contains(macro)) {
  92                                         *result = vars->Get(macro);
  93                                         *recursive_macro = true;
  94                                         return true;
  95                                 }
  96                         }
  97                 }
  98
  99                 MacroResolver::Ptr mresolver = dynamic_pointer_cast<MacroResolver>(resolver.second);
 100
 101                 if (mresolver && mresolver->ResolveMacro(boost::algorithm::join(tokens, "."), cr, result))
 102                         return true;
 103
 104                 Value ref = resolver.second;
 105                 bool valid = true;
 106
 107                 BOOST_FOREACH(const String& token, tokens) {
 108                         if (ref.IsObjectType<Dictionary>()) {
 109                                 Dictionary::Ptr dict = ref;
 110                                 if (dict->Contains(token)) {
 111                                         ref = dict->Get(token);
 112                                         continue;
 113                                 } else {
 114                                         valid = false;
 115                                         break;
 116                                 }
 117                         } else if (ref.IsObject()) {
 118                                 Object::Ptr object = ref;
 119
 120                                 const Type *type = object->GetReflectionType();
 121
 122                                 if (!type) {
 123                                         valid = false;
 124                                         break;
 125                                 }
 126
 127                                 int field = type->GetFieldId(token);
 128
 129                                 if (field == -1) {
 130                                         valid = false;
 131                                         break;
 132                                 }
 133
 134                                 ref = object->GetField(field);
 135                         }
 136                 }
 137
 138                 if (valid) {
 139                         if (tokens[0] == "vars" ||
 140                             tokens[0] == "action_url" ||
 141                             tokens[0] == "notes_url" ||
 142                             tokens[0] == "notes")
 143                                 *recursive_macro = true;
 144
 145                         *result = ref;
 146                         return true;
 147                 }
 148         }
 149
 150         return false;
 151 }
 152
 153 String MacroProcessor::InternalResolveMacros(const String& str, const ResolverList& resolvers,
 154     const CheckResult::Ptr& cr, String *missingMacro,
 155     const MacroProcessor::EscapeCallback& escapeFn, int recursionLevel)
 156 {
 157         CONTEXT("Resolving macros for string '" + str + "'");
 158
 159         if (recursionLevel > 15)
 160                 BOOST_THROW_EXCEPTION(std::runtime_error("Infinite recursion detected while resolving macros"));
 161
 162         size_t offset, pos_first, pos_second;
 163         offset = 0;
 164
 165         String result = str;
 166         while ((pos_first = result.FindFirstOf("$", offset)) != String::NPos) {
 167                 pos_second = result.FindFirstOf("$", pos_first + 1);
 168
 169                 if (pos_second == String::NPos)
 170                         BOOST_THROW_EXCEPTION(std::runtime_error("Closing $ not found in macro format string."));
 171
 172                 String name = result.SubStr(pos_first + 1, pos_second - pos_first - 1);
 173
 174                 String resolved_macro;
 175                 bool recursive_macro;
 176                 bool found = ResolveMacro(name, resolvers, cr, &resolved_macro, &recursive_macro);
 177
 178                 /* $$ is an escape sequence for $. */
 179                 if (name.IsEmpty()) {
 180                         resolved_macro = "$";
 181                         found = true;
 182                 }
 183
 184                 if (!found) {
 185                         if (!missingMacro)
 186                                 Log(LogWarning, "MacroProcessor", "Macro '" + name + "' is not defined.");
 187                         else
 188                                 *missingMacro = name;
 189                 }
 190
 191                 /* recursively resolve macros in the macro if it was a user macro */
 192                 if (recursive_macro)
 193                         resolved_macro = InternalResolveMacros(resolved_macro,
 194                             resolvers, cr, missingMacro, EscapeCallback(), recursionLevel + 1);
 195
 196                 if (escapeFn)
 197                         resolved_macro = escapeFn(resolved_macro);
 198
 199                 result.Replace(pos_first, pos_second - pos_first + 1, resolved_macro);
 200                 offset = pos_first + resolved_macro.GetLength() + 1;
 201         }
 202
 203         return result;
 204 }