Hi We have a schema that doesn't use requi

Custom Validator for absent values about json-schema-validator HOT 4 OPEN

gopichandch commented on June 10, 2024

Custom Validator for absent values

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Comments (4)

justin-tay commented on June 10, 2024

You can always write and register your own custom validator on your custom meta schema.

json-schema-validator/src/test/java/com/networknt/schema/CustomMetaSchemaTest.java

Lines 118 to 139 in 7cda40e

 public void customMetaSchemaWithIgnoredKeyword() throws JsonProcessingException, IOException { 

 ObjectMapper objectMapper = new ObjectMapper(); 

 final JsonMetaSchema metaSchema = JsonMetaSchema 

 .builder("https://github.com/networknt/json-schema-validator/tests/schemas/example01", JsonMetaSchema.getV4()) 

 // Generated UI uses enumNames to render Labels for enum values 

 .addKeyword(new EnumNamesKeyword()) 

 .build(); 

 final JsonSchemaFactory validatorFactory = JsonSchemaFactory.builder(JsonSchemaFactory.getInstance(SpecVersion.VersionFlag.V4)).addMetaSchema(metaSchema).build(); 

 final JsonSchema schema = validatorFactory.getSchema("{\n" + 

 " \"$schema\":\n" + 

 " \"https://github.com/networknt/json-schema-validator/tests/schemas/example01\",\n" + 

 " \"enum\": [\"foo\", \"bar\"],\n" + 

 " \"enumNames\": [\"Foo !\", \"Bar !\"]\n" + 

 "}"); 

 Set<ValidationMessage> messages = schema.validate(objectMapper.readTree("\"foo\"")); 

 assertEquals(1, messages.size()); 

 ValidationMessage message = messages.iterator().next(); 

 assertEquals("$: enumName is Foo !", message.getMessage()); 

 }

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gopichandch commented on June 10, 2024

But it would work only when the value is present in the input json. If the value doesn't exist, it would just run requiredValidator. We need a custom validator here instead of the predefined RequiredValidator.
Maybe like this gopichandch@d8f00a9

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justin-tay commented on June 10, 2024

No that wouldn't be acceptable. I don't see a reason why a custom validator doesn't work. The logic in the PropertiesValidator that is using the RequiredValidator is not using it to generate assertions. The RequiredValidator by itself will be generating the assertions separately, your implementation should be something similar to the RequiredValidator and you shouldn't be looking at the PropertiesValidator. Even if it's really required, you can just replace the PropertiesValidator with your own implementation.

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Custom Validator for absent values about json-schema-validator HOT 4 OPEN

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	public void customMetaSchemaWithIgnoredKeyword() throws JsonProcessingException, IOException {
	ObjectMapper objectMapper = new ObjectMapper();
	final JsonMetaSchema metaSchema = JsonMetaSchema
	.builder("https://github.com/networknt/json-schema-validator/tests/schemas/example01", JsonMetaSchema.getV4())
	// Generated UI uses enumNames to render Labels for enum values
	.addKeyword(new EnumNamesKeyword())
	.build();

	final JsonSchemaFactory validatorFactory = JsonSchemaFactory.builder(JsonSchemaFactory.getInstance(SpecVersion.VersionFlag.V4)).addMetaSchema(metaSchema).build();
	final JsonSchema schema = validatorFactory.getSchema("{\n" +
	" \"$schema\":\n" +
	" \"https://github.com/networknt/json-schema-validator/tests/schemas/example01\",\n" +
	" \"enum\": [\"foo\", \"bar\"],\n" +
	" \"enumNames\": [\"Foo !\", \"Bar !\"]\n" +
	"}");

	Set<ValidationMessage> messages = schema.validate(objectMapper.readTree("\"foo\""));
	assertEquals(1, messages.size());

	ValidationMessage message = messages.iterator().next();
	assertEquals("$: enumName is Foo !", message.getMessage());
	}