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Add OpenAPI JsonMetaSchema (#1011)
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‎README.md

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This is a Java implementation of the [JSON Schema Core Draft v4, v6, v7, v2019-09 and v2020-12](http://json-schema.org/latest/json-schema-core.html) specification for JSON schema validation. This implementation supports [Customizing Meta-Schemas, Vocabularies, Keywords and Formats](doc/custom-meta-schema.md).
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In addition, it also works for OpenAPI 3.0 request/response validation with some [configuration flags](doc/config.md). For users who want to collect information from a JSON node based on the schema, the [walkers](doc/walkers.md) can help. The JSON parser used is the [Jackson](https://github.com/FasterXML/jackson) parser. As it is a key component in our [light-4j](https://github.com/networknt/light-4j) microservices framework to validate request/response against OpenAPI specification for [light-rest-4j](http://www.networknt.com/style/light-rest-4j/) and RPC schema for [light-hybrid-4j](http://www.networknt.com/style/light-hybrid-4j/) at runtime, performance is the most important aspect in the design.
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In addition, [OpenAPI](doc/openapi.md) 3 request/response validation is supported with the use of the appropriate meta-schema. For users who want to collect information from a JSON node based on the schema, the [walkers](doc/walkers.md) can help. The JSON parser used is the [Jackson](https://github.com/FasterXML/jackson) parser. As it is a key component in our [light-4j](https://github.com/networknt/light-4j) microservices framework to validate request/response against OpenAPI specification for [light-rest-4j](http://www.networknt.com/style/light-rest-4j/) and RPC schema for [light-hybrid-4j](http://www.networknt.com/style/light-hybrid-4j/) at runtime, performance is the most important aspect in the design.
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## JSON Schema Specification compatibility
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@@ -493,6 +493,8 @@ This does not mean that using a schema with a later draft specification will aut
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## [Customizing Meta-Schemas, Vocabularies, Keywords and Formats](doc/custom-meta-schema.md)
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## [OpenAPI Specification](doc/openapi.md)
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## [Validators](doc/validators.md)
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## [Configuration](doc/config.md)

‎doc/openapi.md

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# OpenAPI Specification
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The library includes support for the [OpenAPI Specification](https://swagger.io/specification/).
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## Validating a request / response defined in an OpenAPI document
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The library can be used to validate requests and responses with the use of the appropriate meta-schema.
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| Dialect | Meta-schema |
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|--------------------------------------------------|----------------------------------------------------|
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| `https://spec.openapis.org/oas/3.0/dialect` | `com.networknt.schema.oas.OpenApi30.getInstance()` |
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| `https://spec.openapis.org/oas/3.1/dialect/base` | `com.networknt.schema.oas.OpenApi31.getInstance()` |
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```java
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JsonSchemaFactory factory = JsonSchemaFactory.getInstance(VersionFlag.V202012,
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builder -> builder.metaSchema(OpenApi31.getInstance())
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.defaultMetaSchemaIri(OpenApi31.getInstance().getIri()));
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JsonSchema schema = factory.getSchema(SchemaLocation.of(
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"classpath:schema/oas/3.1/petstore.yaml#/components/schemas/PetRequest"));
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String input = "{\r\n"
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+ " \"petType\": \"dog\",\r\n"
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+ " \"bark\": \"woof\"\r\n"
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+ "}";
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Set<ValidationMessage> messages = schema.validate(input, InputFormat.JSON);
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```
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## Validating an OpenAPI document
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The library can be used to validate OpenAPI documents, however the OpenAPI meta-schema documents are not bundled with the library.
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It is recommended that the relevant meta-schema documents are placed in the classpath and are mapped otherwise they will be loaded over the internet.
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The following are the documents required to validate a OpenAPI 3.1 document
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* `https://spec.openapis.org/oas/3.1/schema-base/2022-10-07`
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* `https://spec.openapis.org/oas/3.1/schema/2022-10-07`
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* `https://spec.openapis.org/oas/3.1/dialect/base`
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* `https://spec.openapis.org/oas/3.1/meta/base`
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```java
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SchemaValidatorsConfig config = new SchemaValidatorsConfig();
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config.setPathType(PathType.JSON_POINTER);
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JsonSchema schema = JsonSchemaFactory
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.getInstance(VersionFlag.V202012,
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builder -> builder.schemaMappers(schemaMappers -> schemaMappers
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.mapPrefix("https://spec.openapis.org/oas/3.1", "classpath:oas/3.1")))
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.getSchema(SchemaLocation.of("https://spec.openapis.org/oas/3.1/schema-base/2022-10-07"), config);
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Set<ValidationMessage> messages = schema.validate(openApiDocument, InputFormat.JSON);
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```

‎src/main/java/com/networknt/schema/DefaultJsonMetaSchemaFactory.java

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@@ -39,7 +39,11 @@ public JsonMetaSchema getMetaSchema(String iri, JsonSchemaFactory schemaFactory,
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protected JsonMetaSchema loadMetaSchema(String iri, JsonSchemaFactory schemaFactory,
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SchemaValidatorsConfig config) {
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try {
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return loadMetaSchemaBuilder(iri, schemaFactory, config).build();
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JsonMetaSchema result = loadMetaSchemaBuilder(iri, schemaFactory, config).build();
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if (result.getKeywords().containsKey("discriminator")) {
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config.setOpenAPI3StyleDiscriminators(true);
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}
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return result;
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} catch (InvalidSchemaException e) {
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throw e;
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} catch (Exception e) {

‎src/main/java/com/networknt/schema/JsonSchemaFactory.java

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@@ -359,7 +359,12 @@ protected ValidationContext createValidationContext(final JsonNode schemaNode, S
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private JsonMetaSchema getMetaSchema(final JsonNode schemaNode, SchemaValidatorsConfig config) {
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final JsonNode iriNode = schemaNode.get("$schema");
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if (iriNode != null && iriNode.isTextual()) {
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return metaSchemas.computeIfAbsent(normalizeMetaSchemaUri(iriNode.textValue()), id -> loadMetaSchema(id, config));
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JsonMetaSchema result = metaSchemas.computeIfAbsent(normalizeMetaSchemaUri(iriNode.textValue()),
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id -> loadMetaSchema(id, config));
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if (result.getKeywords().containsKey("discriminator")) {
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config.setOpenAPI3StyleDiscriminators(true);
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}
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return result;
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}
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return null;
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}
@@ -382,7 +387,11 @@ private JsonMetaSchema getMetaSchemaOrDefault(final JsonNode schemaNode, SchemaV
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*/
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public JsonMetaSchema getMetaSchema(String iri, SchemaValidatorsConfig config) {
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String key = normalizeMetaSchemaUri(iri);
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return metaSchemas.computeIfAbsent(key, id -> loadMetaSchema(id, config));
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JsonMetaSchema result = metaSchemas.computeIfAbsent(key, id -> loadMetaSchema(id, config));
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if (result.getKeywords().containsKey("discriminator")) {
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config.setOpenAPI3StyleDiscriminators(true);
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}
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return result;
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}
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/**

‎src/main/java/com/networknt/schema/SchemaId.java

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* Draft 2020-12.
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*/
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public static final String V202012 = "https://json-schema.org/draft/2020-12/schema";
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/**
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* OpenAPI 3.0.
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*/
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public static final String OPENAPI_3_0 = "https://spec.openapis.org/oas/3.0/dialect";
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/**
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* OpenAPI 3.1
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*/
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public static final String OPENAPI_3_1 = "https://spec.openapis.org/oas/3.1/dialect/base";
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}

‎src/main/java/com/networknt/schema/Vocabularies.java

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mapping.put(Vocabulary.V202012_FORMAT_ASSERTION.getIri(), Vocabulary.V202012_FORMAT_ASSERTION);
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mapping.put(Vocabulary.V202012_CONTENT.getIri(), Vocabulary.V202012_CONTENT);
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mapping.put(Vocabulary.OPENAPI_3_1_BASE.getIri(), Vocabulary.OPENAPI_3_1_BASE);
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VALUES = mapping;
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}
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‎src/main/java/com/networknt/schema/Vocabulary.java

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"https://json-schema.org/draft/2020-12/vocab/content", new AnnotationKeyword("contentEncoding"),
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new AnnotationKeyword("contentMediaType"), new AnnotationKeyword("contentSchema"));
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// OpenAPI 3.1
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public static final Vocabulary OPENAPI_3_1_BASE = new Vocabulary("https://spec.openapis.org/oas/3.1/vocab/base",
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new AnnotationKeyword("example"), ValidatorTypeCode.DISCRIMINATOR, new AnnotationKeyword("externalDocs"),
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new AnnotationKeyword("xml"));
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private final String iri;
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private final Set<Keyword> keywords;
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‎src/main/java/com/networknt/schema/oas/OpenApi30.java

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package com.networknt.schema.oas;
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import java.util.Arrays;
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import com.networknt.schema.AnnotationKeyword;
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import com.networknt.schema.Formats;
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import com.networknt.schema.JsonMetaSchema;
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import com.networknt.schema.NonValidationKeyword;
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import com.networknt.schema.SchemaId;
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import com.networknt.schema.SpecVersion;
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import com.networknt.schema.ValidatorTypeCode;
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/**
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* OpenAPI 3.0.
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*/
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public class OpenApi30 {
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private static final String IRI = SchemaId.OPENAPI_3_0;
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private static final String ID = "id";
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private static class Holder {
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private static final JsonMetaSchema INSTANCE;
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static {
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INSTANCE = JsonMetaSchema.builder(IRI)
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.specification(SpecVersion.VersionFlag.V4)
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.idKeyword(ID)
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.formats(Formats.DEFAULT)
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.keywords(Arrays.asList(
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new AnnotationKeyword("title"),
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ValidatorTypeCode.PATTERN,
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ValidatorTypeCode.REQUIRED,
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ValidatorTypeCode.ENUM,
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ValidatorTypeCode.MINIMUM,
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ValidatorTypeCode.MAXIMUM,
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ValidatorTypeCode.EXCLUSIVE_MINIMUM,
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ValidatorTypeCode.EXCLUSIVE_MAXIMUM,
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ValidatorTypeCode.MULTIPLE_OF,
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ValidatorTypeCode.MIN_LENGTH,
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ValidatorTypeCode.MAX_LENGTH,
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ValidatorTypeCode.MIN_ITEMS,
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ValidatorTypeCode.MAX_ITEMS,
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ValidatorTypeCode.UNIQUE_ITEMS,
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ValidatorTypeCode.MIN_PROPERTIES,
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ValidatorTypeCode.MAX_PROPERTIES,
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ValidatorTypeCode.TYPE,
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ValidatorTypeCode.FORMAT,
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new AnnotationKeyword("description"),
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ValidatorTypeCode.ITEMS,
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ValidatorTypeCode.PROPERTIES,
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ValidatorTypeCode.ADDITIONAL_PROPERTIES,
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new AnnotationKeyword("default"),
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ValidatorTypeCode.ALL_OF,
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ValidatorTypeCode.ONE_OF,
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ValidatorTypeCode.ANY_OF,
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ValidatorTypeCode.NOT,
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new AnnotationKeyword("deprecated"),
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ValidatorTypeCode.DISCRIMINATOR,
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new AnnotationKeyword("example"),
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new AnnotationKeyword("externalDocs"),
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new NonValidationKeyword("nullable"),
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ValidatorTypeCode.READ_ONLY,
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ValidatorTypeCode.WRITE_ONLY,
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new AnnotationKeyword("xml"),
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ValidatorTypeCode.REF
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))
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.build();
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}
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}
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public static JsonMetaSchema getInstance() {
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return Holder.INSTANCE;
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}
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}

‎src/main/java/com/networknt/schema/oas/OpenApi31.java

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package com.networknt.schema.oas;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.Map;
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import com.networknt.schema.Formats;
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import com.networknt.schema.JsonMetaSchema;
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import com.networknt.schema.NonValidationKeyword;
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import com.networknt.schema.SchemaId;
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import com.networknt.schema.SpecVersion;
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import com.networknt.schema.ValidatorTypeCode;
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/**
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* OpenAPI 3.1.
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*/
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public class OpenApi31 {
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private static final String IRI = SchemaId.OPENAPI_3_1;
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private static final String ID = "$id";
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private static final Map<String, Boolean> VOCABULARY;
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static {
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Map<String, Boolean> vocabulary = new HashMap<>();
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vocabulary.put("https://json-schema.org/draft/2020-12/vocab/core", true);
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vocabulary.put("https://json-schema.org/draft/2020-12/vocab/applicator", true);
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vocabulary.put("https://json-schema.org/draft/2020-12/vocab/unevaluated", true);
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vocabulary.put("https://json-schema.org/draft/2020-12/vocab/validation", true);
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vocabulary.put("https://json-schema.org/draft/2020-12/vocab/meta-data", true);
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vocabulary.put("https://json-schema.org/draft/2020-12/vocab/format-annotation", true);
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vocabulary.put("https://json-schema.org/draft/2020-12/vocab/content", true);
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vocabulary.put("https://spec.openapis.org/oas/3.1/vocab/base", false);
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VOCABULARY = vocabulary;
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}
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private static class Holder {
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private static final JsonMetaSchema INSTANCE;
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static {
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INSTANCE = JsonMetaSchema.builder(IRI)
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.specification(SpecVersion.VersionFlag.V202012)
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.idKeyword(ID)
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.formats(Formats.DEFAULT)
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.keywords(ValidatorTypeCode.getKeywords(SpecVersion.VersionFlag.V202012))
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// keywords that may validly exist, but have no validation aspect to them
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.keywords(Arrays.asList(
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new NonValidationKeyword("definitions")
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))
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.vocabularies(VOCABULARY)
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.build();
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}
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}
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public static JsonMetaSchema getInstance() {
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return Holder.INSTANCE;
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}
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}

‎src/test/java/com/networknt/schema/MetaSchemaValidationTest.java

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*/
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@Test
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void oas31() throws IOException {
41-
try (InputStream input = MetaSchemaValidationTest.class.getResourceAsStream("/schema/oas/v31/petstore.json")) {
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try (InputStream input = MetaSchemaValidationTest.class.getResourceAsStream("/schema/oas/3.1/petstore.json")) {
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JsonNode inputData = JsonMapperFactory.getInstance().readTree(input);
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SchemaValidatorsConfig config = new SchemaValidatorsConfig();
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config.setPathType(PathType.JSON_POINTER);
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JsonSchema schema = JsonSchemaFactory
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.getInstance(VersionFlag.V202012,
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builder -> builder.schemaMappers(schemaMappers -> schemaMappers
48-
.mapPrefix("https://spec.openapis.org/oas/3.1", "classpath:oas/v31")
49-
.mapPrefix("https://json-schema.org", "classpath:")))
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.mapPrefix("https://spec.openapis.org/oas/3.1", "classpath:oas/3.1")))
5049
.getSchema(SchemaLocation.of("https://spec.openapis.org/oas/3.1/schema-base/2022-10-07"), config);
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Set<ValidationMessage> messages = schema.validate(inputData);
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assertEquals(0, messages.size());

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