Allow to read Nan/Inf values from JSON

Allow to read Nan/Inf values from JSON
9fbb79a21d81cf178abc89cd11d7ac75a9a4aaed

4 files changed, 40 insertions, 0 deletions

diff --git a/library/cpp/json/json_reader.cpp b/library/cpp/json/json_reader.cpp
index 0d048dfcd1e..a1a9584481f 100644
--- a/library/cpp/json/json_reader.cpp
+++ b/library/cpp/json/json_reader.cpp
@@ -336,6 +336,9 @@ namespace NJson {
         constexpr ui32 ConvertToRapidJsonFlags(ui8 flags) {
             ui32 rapidjsonFlags = rapidjson::kParseNoFlags;
 
+            if (flags & ReaderConfigFlags::NANINF) {
+                rapidjsonFlags |= rapidjson::kParseNanAndInfFlag;
+            }
             if (flags & ReaderConfigFlags::ITERATIVE) {
                 rapidjsonFlags |= rapidjson::kParseIterativeFlag;
             }
@@ -371,6 +374,7 @@ namespace NJson {
         ); \
     }
 
+            TRY_EXTRACT_FLAG(ReaderConfigFlags::NANINF);
             TRY_EXTRACT_FLAG(ReaderConfigFlags::ITERATIVE);
             TRY_EXTRACT_FLAG(ReaderConfigFlags::COMMENTS);
             TRY_EXTRACT_FLAG(ReaderConfigFlags::VALIDATE);
@@ -405,6 +409,9 @@ namespace NJson {
             if (config.AllowEscapedApostrophe) {
                 flags |= ReaderConfigFlags::ESCAPE;
             }
+            if (config.AllowReadNanInf) {
+                flags |= ReaderConfigFlags::NANINF;
+            }
 
             return ReadWithRuntimeFlags(flags, reader, is, handler);
         }
diff --git a/library/cpp/json/json_reader.h b/library/cpp/json/json_reader.h
index 6c8e8c32e2a..373a390085e 100644
--- a/library/cpp/json/json_reader.h
+++ b/library/cpp/json/json_reader.h
@@ -20,6 +20,8 @@ namespace NJson {
         bool AllowComments = false;
         bool DontValidateUtf8 = false;
         bool AllowEscapedApostrophe = false;
+        // Allow to read Nan and Inf as integer values
+        bool AllowReadNanInf = false;
 
         ui64 MaxDepth = 0;
 
@@ -48,6 +50,7 @@ namespace NJson {
     bool ReadJson(IInputStream* in, const TJsonReaderConfig* config, TJsonCallbacks* callbacks);
 
     enum ReaderConfigFlags {
+        NANINF = 0b10000,
         ITERATIVE = 0b1000,
         COMMENTS = 0b0100,
         VALIDATE = 0b0010,
diff --git a/library/cpp/json/ut/json_reader_nan_ut.cpp b/library/cpp/json/ut/json_reader_nan_ut.cpp
new file mode 100644
index 00000000000..fdd66249eb2
--- /dev/null
+++ b/library/cpp/json/ut/json_reader_nan_ut.cpp
@@ -0,0 +1,29 @@
+#include <library/cpp/json/json_reader.h>
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NJson;
+
+namespace {
+
+constexpr TStringBuf JSON_NAN_TEST = "{ \"Value1\": 0.0, \"Value2\": 1, \"Value3\": NaN }";
+
+}
+
+Y_UNIT_TEST_SUITE(TJsonReaderNanTest) {
+    Y_UNIT_TEST(WithoutNanTest) {
+        TJsonReaderConfig cfg;
+        TJsonValue out;
+        // This read will fail
+        UNIT_ASSERT(!ReadJsonTree(JSON_NAN_TEST, &cfg, &out, /* throwOnError */ false));
+
+    }
+    Y_UNIT_TEST(WithNanTest) {
+        TJsonReaderConfig cfg;
+        cfg.AllowReadNanInf = true;
+
+        TJsonValue out;
+        // This read will ok
+        UNIT_ASSERT(ReadJsonTree(JSON_NAN_TEST, &cfg, &out, /* throwOnError */ false));
+    }
+}
+
diff --git a/library/cpp/json/ut/ya.make b/library/cpp/json/ut/ya.make
index 2ed6ccb9f0b..89363ddd6af 100644
--- a/library/cpp/json/ut/ya.make
+++ b/library/cpp/json/ut/ya.make
@@ -8,6 +8,7 @@ PEERDIR(
 SRCS(
     json_reader_fast_ut.cpp
     json_reader_ut.cpp
+    json_reader_nan_ut.cpp
     json_prettifier_ut.cpp
     json_writer_ut.cpp
     json_saveload_ut.cpp