json-schema-test.cpp

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/*
 * JSON schema validator for JSON for modern C++
 *
 * Copyright (c) 2016-2019 Patrick Boettcher <p@yai.se>.
 *
 * SPDX-License-Identifier: MIT
 *
 */
#include <nlohmann/json-schema.hpp>
 
#include <fstream>
#include <iostream>
#include <regex>
 
using nlohmann::json;
using nlohmann::json_uri;
using nlohmann::json_schema::json_validator;
 
static void loader(const json_uri &uri, json &schema)
{
    if (uri.location() == "http://json-schema.org/draft-07/schema") {
        schema = nlohmann::json_schema::draft7_schema_builtin;
        return;
    }
 
    std::string fn = JSON_SCHEMA_TEST_SUITE_PATH;
    fn += "/remotes";
    fn += uri.path();
    std::cerr << fn << "\n";
 
    std::fstream s(fn.c_str());
    if (!s.good())
        throw std::invalid_argument("could not open " + uri.url() + " for schema loading\n");
 
    try {
        s >> schema;
    } catch (std::exception &e) {
        throw e;
    }
}
 
// from here
// https://stackoverflow.com/a/34571089/880584
static std::string base64_decode(const std::string &in)
{
    std::string out;
 
    std::vector<int> T(256, -1);
    for (int i = 0; i < 64; i++)
        T["ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"[i]] = i;
 
    unsigned val = 0;
    int valb = -8;
    for (uint8_t c : in) {
        if (c == '=')
            break;
 
        if (T[c] == -1) {
            throw std::invalid_argument("base64-decode: unexpected character in encode string: '" + std::string(1, c) + "'");
        }
        val = (val << 6) + T[c];
        valb += 6;
        if (valb >= 0) {
            out.push_back(char((val >> valb) & 0xFF));
            valb -= 8;
        }
    }
    return out;
}
 
static void content(const std::string &contentEncoding, const std::string &contentMediaType, const json &instance)
{
    std::string content = instance;
 
    if (contentEncoding == "base64")
        content = base64_decode(instance);
    else if (contentEncoding != "")
        throw std::invalid_argument("unable to check for contentEncoding '" + contentEncoding + "'");
 
    if (contentMediaType == "application/json")
        auto dummy = json::parse(content); // throws if conversion fails
    else if (contentMediaType != "")
        throw std::invalid_argument("unable to check for contentMediaType '" + contentMediaType + "'");
}
 
int main(void)
{
    json validation; // a validation case following the JSON-test-suite-schema
 
    try {
        std::cin >> validation;
    } catch (std::exception &e) {
        std::cout << e.what() << "\n";
        return EXIT_FAILURE;
    }
 
    size_t total_failed = 0,
           total = 0;
 
    for (auto &test_group : validation) {
        size_t group_failed = 0,
               group_total = 0;
 
        std::cout << "Testing Group " << test_group["description"] << "\n";
 
        const auto &schema = test_group["schema"];
 
        json_validator validator(loader,
                                 nlohmann::json_schema::default_string_format_check,
                                 content);
 
        validator.set_root_schema(schema);
 
        for (auto &test_case : test_group["tests"]) {
            std::cout << "  Testing Case " << test_case["description"] << "\n";
 
            bool valid = true;
 
            try {
                validator.validate(test_case["data"]);
            } catch (const std::out_of_range &e) {
                valid = false;
                std::cout << "    Test Case Exception (out of range): " << e.what() << "\n";
 
            } catch (const std::invalid_argument &e) {
                valid = false;
                std::cout << "    Test Case Exception (invalid argument): " << e.what() << "\n";
 
            } catch (const std::logic_error &e) {
                valid = !test_case["valid"]; /* force test-case failure */
                std::cout << "    Not yet implemented: " << e.what() << "\n";
            }
 
            if (valid == test_case["valid"])
                std::cout << "      --> Test Case exited with " << valid << " as expected.\n";
            else {
                group_failed++;
                std::cout << "      --> Test Case exited with " << valid << " NOT expected.\n";
            }
            group_total++;
            std::cout << "\n";
        }
        total_failed += group_failed;
        total += group_total;
        std::cout << "Group RESULT: " << test_group["description"] << " "
                  << (group_total - group_failed) << " of " << group_total
                  << " have succeeded - " << group_failed << " failed\n";
        std::cout << "-------------\n";
    }
 
    std::cout << "Total RESULT: " << (total - total_failed) << " of " << total << " have succeeded - " << total_failed << " failed\n";
 
    return total_failed;
}