122 lines
3.5 KiB
C++
122 lines
3.5 KiB
C++
/*
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* Modern C++ JSON schema validator
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*
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* Licensed under the MIT License <http://opensource.org/licenses/MIT>.
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*
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* Copyright (c) 2016 Patrick Boettcher <patrick.boettcher@posteo.de>.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom
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* the Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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* NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
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* OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
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* THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <json-schema.hpp>
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#include <fstream>
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#include <set>
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using nlohmann::json;
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using nlohmann::json_uri;
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using nlohmann::json_schema_draft4::json_validator;
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static void usage(const char *name)
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{
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std::cerr << "Usage: " << name << " <schema> < <document>\n";
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exit(EXIT_FAILURE);
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}
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#if 0
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resolver r(nlohmann::json_schema_draft4::root_schema,
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nlohmann::json_schema_draft4::root_schema["id"]);
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schema_refs_.insert(r.schema_refs.begin(), r.schema_refs.end());
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assert(r.undefined_refs.size() == 0);
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#endif
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int main(int argc, char *argv[])
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{
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if (argc != 2)
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usage(argv[0]);
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json_validator validator;
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std::fstream f(argv[1]);
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if (!f.good()) {
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std::cerr << "could not open " << argv[1] << " for reading\n";
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usage(argv[0]);
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}
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// 1) Read the schema for the document you want to validate
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json schema;
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try {
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f >> schema;
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} catch (std::exception &e) {
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std::cerr << e.what() << " at " << f.tellp() << "\n";
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return EXIT_FAILURE;
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}
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// 2) insert this schema to the validator
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// this resolves remote-schemas, sub-schemas and references
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bool error = false;
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do {
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// inserting with json_uri("#") means this is the document's root-schema
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auto missing_schemas = validator.insert_schema(schema, json_uri("#"));
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// schema was inserted and all references have been fulfilled
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if (missing_schemas.size() == 0)
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break;
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// schema was not inserted because it references unknown schemas
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// 3) load missing schemas and insert them
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for (auto ref : missing_schemas) {
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std::cerr << "missing schema URL " << ref << " - trying to load it\n";
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std::fstream lf(ref.path());
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if (!lf.good()) {
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std::cerr << "could not open " << ref.url() << "\n";
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error = true;
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break;
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}
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json extra;
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try {
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lf >> extra;
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} catch (std::exception &e) {
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std::cerr << e.what() << " at " << lf.tellp() << "\n";
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return EXIT_FAILURE;
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}
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validator.insert_schema(extra, json_uri(ref.url()));
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std::cerr << "OK";
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}
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} while (!error);
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// 4) do the actual validation of the document
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json document;
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try {
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document << std::cin;
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validator.validate(document);
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} catch (std::exception &e) {
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std::cerr << "schema validation failed\n";
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std::cerr << e.what() << "\n";
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return EXIT_FAILURE;
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}
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std::cerr << "document is valid\n";
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return EXIT_SUCCESS;
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}
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