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Jackson Validation
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| dependencies { | |
| implementation("org.hibernate.validator:hibernate-validator:6.1.5.Final") | |
| implementation("javax.el:javax.el-api:3.0.0") | |
| implementation("org.glassfish:javax.el:3.0.0") | |
| } |
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| import kotlin.annotation.AnnotationTarget.CLASS | |
| @Target(CLASS) | |
| annotation class JsonValidated |
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| import com.fasterxml.jackson.databind.BeanDescription | |
| import com.fasterxml.jackson.databind.DeserializationConfig | |
| import com.fasterxml.jackson.databind.JsonDeserializer | |
| import com.fasterxml.jackson.databind.deser.BeanDeserializerModifier | |
| import javax.validation.Validation | |
| object ValidatingBeanDeserializerModifier : BeanDeserializerModifier() { | |
| private val validator = Validation.byDefaultProvider() | |
| .configure() | |
| .buildValidatorFactory() | |
| .validator | |
| override fun modifyDeserializer( | |
| config: DeserializationConfig, | |
| beanDesc: BeanDescription, | |
| deserializer: JsonDeserializer<*> | |
| ) = if (beanDesc.classAnnotations.has(JsonValidated::class.java)) { | |
| ValidatingDeserializer(deserializer, validator) | |
| } else { | |
| deserializer | |
| } | |
| } |
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| import com.fasterxml.jackson.core.JsonParser | |
| import com.fasterxml.jackson.databind.DeserializationContext | |
| import com.fasterxml.jackson.databind.JsonDeserializer | |
| import com.fasterxml.jackson.databind.JsonMappingException | |
| import com.fasterxml.jackson.databind.deser.std.DelegatingDeserializer | |
| import javax.validation.Validator | |
| class ValidatingDeserializer( | |
| delegate: JsonDeserializer<*>, | |
| private val validator: Validator | |
| ) : DelegatingDeserializer(delegate) { | |
| override fun newDelegatingInstance(newDelegatee: JsonDeserializer<*>): JsonDeserializer<*> { | |
| return ValidatingDeserializer(newDelegatee, validator) | |
| } | |
| override fun deserialize(p: JsonParser, ctxt: DeserializationContext): Any? { | |
| return super.deserialize(p, ctxt)?.let { validate(it) } | |
| } | |
| private fun validate(deserialized: Any): Any { | |
| val constraintViolations = validator.validate(deserialized) | |
| when { | |
| constraintViolations.isEmpty() -> return deserialized | |
| else -> { | |
| val message = constraintViolations.joinToString { it.message.format(it.invalidValue) } | |
| throw JsonMappingException(null, message) | |
| } | |
| } | |
| } | |
| } |
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| import com.fasterxml.jackson.databind.module.SimpleModule | |
| import javax.validation.Validation | |
| class ValidatingModule : SimpleModule() { | |
| init { | |
| setDeserializerModifier(ValidatingBeanDeserializerModifier) | |
| } | |
| } |
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