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Merge pull request #66170 from RedMser/json-fix-invalid-escapes

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Disallow invalid escape sequences in `JSON.parse`
This commit is contained in:
Yuri Sizov 2023-07-12 15:08:29 +02:00
commit f6d568b9e4
2 changed files with 91 additions and 1 deletions
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8
core/io/json.cpp
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@ -299,9 +299,15 @@ Error JSON::_get_token(const char32_t *p_str, int &index, int p_len, Token &r_to
}
} break;
default: {
case '"':
case '\\':
case '/': {
res = next;
} break;
default: {
r_err_str = "Invalid escape sequence.";
return ERR_PARSE_ERROR;
}
}
str += res;

84
tests/core/io/test_json.h
View File

@ -146,6 +146,90 @@ TEST_CASE("[JSON] Parsing objects (dictionaries)") {
dictionary["empty_object"].hash() == Dictionary().hash(),
"The parsed JSON should contain the expected values.");
}
TEST_CASE("[JSON] Parsing escape sequences") {
// Only certain escape sequences are valid according to the JSON specification.
// Others must result in a parsing error instead.
JSON json;
TypedArray<String> valid_escapes;
valid_escapes.push_back("\";\"");
valid_escapes.push_back("\\;\\");
valid_escapes.push_back("/;/");
valid_escapes.push_back("b;\b");
valid_escapes.push_back("f;\f");
valid_escapes.push_back("n;\n");
valid_escapes.push_back("r;\r");
valid_escapes.push_back("t;\t");
SUBCASE("Basic valid escape sequences") {
for (int i = 0; i < valid_escapes.size(); i++) {
String valid_escape = valid_escapes[i];
String valid_escape_string = valid_escape.get_slice(";", 0);
String valid_escape_value = valid_escape.get_slice(";", 1);
String json_string = "\"\\";
json_string += valid_escape_string;
json_string += "\"";
json.parse(json_string);
CHECK_MESSAGE(
json.get_error_line() == 0,
vformat("Parsing valid escape sequence `%s` as JSON should parse successfully.", valid_escape_string));
String json_value = json.get_data();
CHECK_MESSAGE(
json_value == valid_escape_value,
vformat("Parsing valid escape sequence `%s` as JSON should return the expected value.", valid_escape_string));
}
}
SUBCASE("Valid unicode escape sequences") {
String json_string = "\"\\u0000\"";
json.parse(json_string);
CHECK_MESSAGE(
json.get_error_line() == 0,
vformat("Parsing valid unicode escape sequence with value `0000` as JSON should parse successfully."));
String json_value = json.get_data();
CHECK_MESSAGE(
json_value == "\0",
vformat("Parsing valid unicode escape sequence with value `0000` as JSON should return the expected value."));
}
SUBCASE("Invalid escape sequences") {
for (char32_t i = 0; i < 128; i++) {
bool skip = false;
for (int j = 0; j < valid_escapes.size(); j++) {
String valid_escape = valid_escapes[j];
String valid_escape_string = valid_escape.get_slice(";", 0);
if (valid_escape_string[0] == i) {
skip = true;
break;
}
}
if (skip) {
continue;
}
String json_string = "\"\\";
json_string += i;
json_string += "\"";
Error err = json.parse(json_string);
// TODO: Line number is currently kept on 0, despite an error occurring. This should be fixed in the JSON parser.
// CHECK_MESSAGE(
// json.get_error_line() != 0,
// vformat("Parsing invalid escape sequence with ASCII value `%d` as JSON should fail to parse.", i));
CHECK_MESSAGE(
err == ERR_PARSE_ERROR,
vformat("Parsing invalid escape sequence with ASCII value `%d` as JSON should fail to parse with ERR_PARSE_ERROR.", i));
}
}
}
} // namespace TestJSON
#endif // TEST_JSON_H