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sd-json: when parsing optionally insist top-level variant is object or array

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Typically, the top-level JSON object has to be an object, in any json
document we parse, hence let's add a simple way to enforce that.

Make use of this in various places.

(Note, various other JSON parsers insist on this logic right from the
beginning, but I actually thinking making this insisting optional like
this patch does it is the cleaner approach)
This commit is contained in:
Lennart Poettering
2026-03-20 15:34:56 +01:00
committed by Daan De Meyer
parent bc6380ae07
commit 2c74a91cb8
28 changed files with 405 additions and 53 deletions
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src/test/test-json.c
+42
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@@ -1588,4 +1588,46 @@ TEST(json_variant_compare) {
test_json_variant_compare_one("{\"a\":\"b\",\"b\":\"c\"}", "{\"a\":\"b\"}", 1);
}
TEST(must_be) {
ASSERT_OK(sd_json_parse("null", /* flags= */ 0, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL));
ASSERT_ERROR(sd_json_parse("null", SD_JSON_PARSE_MUST_BE_OBJECT, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL), EINVAL);
ASSERT_ERROR(sd_json_parse("null", SD_JSON_PARSE_MUST_BE_ARRAY, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL), EINVAL);
ASSERT_ERROR(sd_json_parse("null", SD_JSON_PARSE_MUST_BE_OBJECT|SD_JSON_PARSE_MUST_BE_ARRAY, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL), EINVAL);
ASSERT_OK(sd_json_parse("true", /* flags= */ 0, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL));
ASSERT_ERROR(sd_json_parse("true", SD_JSON_PARSE_MUST_BE_OBJECT, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL), EINVAL);
ASSERT_ERROR(sd_json_parse("true", SD_JSON_PARSE_MUST_BE_ARRAY, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL), EINVAL);
ASSERT_ERROR(sd_json_parse("true", SD_JSON_PARSE_MUST_BE_OBJECT|SD_JSON_PARSE_MUST_BE_ARRAY, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL), EINVAL);
ASSERT_OK(sd_json_parse("\"foo\"", /* flags= */ 0, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL));
ASSERT_ERROR(sd_json_parse("\"foo\"", SD_JSON_PARSE_MUST_BE_OBJECT, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL), EINVAL);
ASSERT_ERROR(sd_json_parse("\"foo\"", SD_JSON_PARSE_MUST_BE_ARRAY, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL), EINVAL);
ASSERT_ERROR(sd_json_parse("\"foo\"", SD_JSON_PARSE_MUST_BE_OBJECT|SD_JSON_PARSE_MUST_BE_ARRAY, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL), EINVAL);
ASSERT_OK(sd_json_parse("4711", /* flags= */ 0, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL));
ASSERT_ERROR(sd_json_parse("4711", SD_JSON_PARSE_MUST_BE_OBJECT, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL), EINVAL);
ASSERT_ERROR(sd_json_parse("4711", SD_JSON_PARSE_MUST_BE_ARRAY, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL), EINVAL);
ASSERT_ERROR(sd_json_parse("4711", SD_JSON_PARSE_MUST_BE_OBJECT|SD_JSON_PARSE_MUST_BE_ARRAY, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL), EINVAL);
ASSERT_OK(sd_json_parse("-4711", /* flags= */ 0, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL));
ASSERT_ERROR(sd_json_parse("-4711", SD_JSON_PARSE_MUST_BE_OBJECT, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL), EINVAL);
ASSERT_ERROR(sd_json_parse("-4711", SD_JSON_PARSE_MUST_BE_ARRAY, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL), EINVAL);
ASSERT_ERROR(sd_json_parse("-4711", SD_JSON_PARSE_MUST_BE_OBJECT|SD_JSON_PARSE_MUST_BE_ARRAY, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL), EINVAL);
ASSERT_OK(sd_json_parse("-4.5", /* flags= */ 0, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL));
ASSERT_ERROR(sd_json_parse("-4.5", SD_JSON_PARSE_MUST_BE_OBJECT, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL), EINVAL);
ASSERT_ERROR(sd_json_parse("-4.5", SD_JSON_PARSE_MUST_BE_ARRAY, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL), EINVAL);
ASSERT_ERROR(sd_json_parse("-4.5", SD_JSON_PARSE_MUST_BE_OBJECT|SD_JSON_PARSE_MUST_BE_ARRAY, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL), EINVAL);
ASSERT_OK(sd_json_parse("{}", /* flags= */ 0, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL));
ASSERT_OK(sd_json_parse("{}", SD_JSON_PARSE_MUST_BE_OBJECT, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL));
ASSERT_ERROR(sd_json_parse("{}", SD_JSON_PARSE_MUST_BE_ARRAY, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL), EINVAL);
ASSERT_OK(sd_json_parse("{}", SD_JSON_PARSE_MUST_BE_OBJECT|SD_JSON_PARSE_MUST_BE_ARRAY, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL));
ASSERT_OK(sd_json_parse("[]", /* flags= */ 0, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL));
ASSERT_ERROR(sd_json_parse("[]", SD_JSON_PARSE_MUST_BE_OBJECT, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL), EINVAL);
ASSERT_OK(sd_json_parse("[]", SD_JSON_PARSE_MUST_BE_ARRAY, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL));
ASSERT_OK(sd_json_parse("[]", SD_JSON_PARSE_MUST_BE_OBJECT|SD_JSON_PARSE_MUST_BE_ARRAY, /* ret= */ NULL, /* reterr_line= */ NULL, /* reterr_column= */ NULL));
}
DEFINE_TEST_MAIN(LOG_DEBUG);