Fixed non-conformance in JSON parsing for empty strings in numeric fields. (#19259)

Ruby & PHP will raise a warning, but will also raise a ParseError in the next minor release.

PiperOrigin-RevId: 696138522

Author: haberman

php/ext/google/protobuf/message.c

@@ -722,12 +722,20 @@ PHP_METHOD(Message, mergeFromJsonString) {
   }
 
   upb_Status_Clear(&status);
-  if (!upb_JsonDecode(data, data_len, intern->msg, intern->desc->msgdef,
-                      DescriptorPool_GetSymbolTable(), options, arena,
-                      &status)) {
-    zend_throw_exception_ex(NULL, 0, "Error occurred during parsing: %s",
-                            upb_Status_ErrorMessage(&status));
-    return;
+  int result = upb_JsonDecodeDetectingNonconformance(
+      data, data_len, intern->msg, intern->desc->msgdef,
+      DescriptorPool_GetSymbolTable(), options, arena, &status);
+
+  switch (result) {
+    case kUpb_JsonDecodeResult_Ok:
+      break;
+    case kUpb_JsonDecodeResult_OkWithEmptyStringNumerics:
+      zend_error(E_USER_WARNING, "%s", upb_Status_ErrorMessage(&status));
+      return;
+    case kUpb_JsonDecodeResult_Error:
+      zend_throw_exception_ex(NULL, 0, "Error occurred during parsing: %s",
+                              upb_Status_ErrorMessage(&status));
+      return;
   }
 }
 

php/ext/google/protobuf/php-upb.c

@@ -523,6 +523,7 @@ typedef struct {
   upb_Arena* arena; /* TODO: should we have a tmp arena for tmp data? */
   const upb_DefPool* symtab;
   int depth;
+  int result;
   upb_Status* status;
   jmp_buf err;
   int line;
@@ -1152,6 +1153,16 @@ static int64_t jsondec_strtoint64(jsondec* d, upb_StringView str) {
   return ret;
 }
 
+static void jsondec_checkempty(jsondec* d, upb_StringView str,
+                               const upb_FieldDef* f) {
+  if (str.size != 0) return;
+  d->result = kUpb_JsonDecodeResult_OkWithEmptyStringNumerics;
+  upb_Status_SetErrorFormat(d->status,
+                            "Empty string is not a valid number (field: %s). "
+                            "This will be an error in a future version.",
+                            upb_FieldDef_FullName(f));
+}
+
 /* Primitive value types ******************************************************/
 
 /* Parse INT32 or INT64 value. */
@@ -1173,6 +1184,7 @@ static upb_MessageValue jsondec_int(jsondec* d, const upb_FieldDef* f) {
     }
     case JD_STRING: {
       upb_StringView str = jsondec_string(d);
+      jsondec_checkempty(d, str, f);
       val.int64_val = jsondec_strtoint64(d, str);
       break;
     }
@@ -1210,6 +1222,7 @@ static upb_MessageValue jsondec_uint(jsondec* d, const upb_FieldDef* f) {
     }
     case JD_STRING: {
       upb_StringView str = jsondec_string(d);
+      jsondec_checkempty(d, str, f);
       val.uint64_val = jsondec_strtouint64(d, str);
       break;
     }
@@ -1238,14 +1251,26 @@ static upb_MessageValue jsondec_double(jsondec* d, const upb_FieldDef* f) {
       break;
     case JD_STRING:
       str = jsondec_string(d);
-      if (jsondec_streql(str, "NaN")) {
+      if (str.size == 0) {
+        jsondec_checkempty(d, str, f);
+        val.double_val = 0.0;
+      } else if (jsondec_streql(str, "NaN")) {
         val.double_val = NAN;
       } else if (jsondec_streql(str, "Infinity")) {
         val.double_val = INFINITY;
       } else if (jsondec_streql(str, "-Infinity")) {
         val.double_val = -INFINITY;
       } else {
-        val.double_val = strtod(str.data, NULL);
+        char* end;
+        val.double_val = strtod(str.data, &end);
+        if (end != str.data + str.size) {
+          d->result = kUpb_JsonDecodeResult_OkWithEmptyStringNumerics;
+          upb_Status_SetErrorFormat(
+              d->status,
+              "Non-number characters in quoted number (field: %s). "
+              "This will be an error in a future version.",
+              upb_FieldDef_FullName(f));
+        }
       }
       break;
     default:
@@ -1987,10 +2012,10 @@ static void jsondec_wellknown(jsondec* d, upb_Message* msg,
   }
 }
 
-static bool upb_JsonDecoder_Decode(jsondec* const d, upb_Message* const msg,
-                                   const upb_MessageDef* const m) {
+static int upb_JsonDecoder_Decode(jsondec* const d, upb_Message* const msg,
+                                  const upb_MessageDef* const m) {
   UPB_ASSERT(!upb_Message_IsFrozen(msg));
-  if (UPB_SETJMP(d->err)) return false;
+  if (UPB_SETJMP(d->err)) return kUpb_JsonDecodeResult_Error;
 
   jsondec_tomsg(d, msg, m);
 
@@ -1999,16 +2024,19 @@ static bool upb_JsonDecoder_Decode(jsondec* const d, upb_Message* const msg,
   jsondec_consumews(d);
 
   if (d->ptr == d->end) {
-    return true;
+    return d->result;
   } else {
     jsondec_seterrmsg(d, "unexpected trailing characters");
-    return false;
+    return kUpb_JsonDecodeResult_Error;
   }
 }
 
-bool upb_JsonDecode(const char* buf, size_t size, upb_Message* msg,
-                    const upb_MessageDef* m, const upb_DefPool* symtab,
-                    int options, upb_Arena* arena, upb_Status* status) {
+int upb_JsonDecodeDetectingNonconformance(const char* buf, size_t size,
+                                          upb_Message* msg,
+                                          const upb_MessageDef* m,
+                                          const upb_DefPool* symtab,
+                                          int options, upb_Arena* arena,
+                                          upb_Status* status) {
   UPB_ASSERT(!upb_Message_IsFrozen(msg));
   jsondec d;
 
@@ -2021,6 +2049,7 @@ bool upb_JsonDecode(const char* buf, size_t size, upb_Message* msg,
   d.status = status;
   d.options = options;
   d.depth = 64;
+  d.result = kUpb_JsonDecodeResult_Ok;
   d.line = 1;
   d.line_begin = d.ptr;
   d.debug_field = NULL;