org.http4k.format.ConfigurableJackson.kt Maven / Gradle / Ivy

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Http4k Jackson JSON/XML support
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package org.http4k.format

import com.fasterxml.jackson.core.JsonParser.NumberType.BIG_INTEGER
import com.fasterxml.jackson.core.JsonParser.NumberType.INT
import com.fasterxml.jackson.core.JsonParser.NumberType.LONG
import com.fasterxml.jackson.databind.JsonNode
import com.fasterxml.jackson.databind.ObjectMapper
import com.fasterxml.jackson.databind.node.ArrayNode
import com.fasterxml.jackson.databind.node.BigIntegerNode
import com.fasterxml.jackson.databind.node.BooleanNode
import com.fasterxml.jackson.databind.node.DecimalNode
import com.fasterxml.jackson.databind.node.NullNode
import com.fasterxml.jackson.databind.node.NumericNode
import com.fasterxml.jackson.databind.node.ObjectNode
import com.fasterxml.jackson.databind.node.TextNode
import com.fasterxml.jackson.module.kotlin.KotlinModule
import com.fasterxml.jackson.module.kotlin.convertValue
import com.fasterxml.jackson.module.kotlin.jacksonTypeRef
import com.fasterxml.jackson.module.kotlin.readValue
import io.cloudevents.core.builder.CloudEventBuilder
import io.cloudevents.jackson.JsonCloudEventData
import org.http4k.core.Body
import org.http4k.core.ContentType
import org.http4k.core.ContentType.Companion.APPLICATION_JSON
import org.http4k.core.HttpMessage
import org.http4k.core.with
import org.http4k.format.JsonType.Integer
import org.http4k.format.JsonType.Number
import org.http4k.lens.BiDiBodyLensSpec
import org.http4k.lens.BiDiMapping
import org.http4k.lens.ContentNegotiation
import org.http4k.lens.ContentNegotiation.Companion.None
import org.http4k.lens.string
import org.http4k.websocket.WsMessage
import java.io.InputStream
import java.math.BigDecimal
import java.math.BigInteger
import kotlin.reflect.KClass

open class ConfigurableJackson(
    val mapper: ObjectMapper,
    override val defaultContentType: ContentType = APPLICATION_JSON
) : AutoMarshallingJson() {

    override fun typeOf(value: JsonNode): JsonType = when (value) {
        is TextNode -> JsonType.String
        is BooleanNode -> JsonType.Boolean
        is NumericNode -> when (value.numberType()) {
            INT, LONG, BIG_INTEGER -> Integer
            else -> Number
        }

        is ArrayNode -> JsonType.Array
        is ObjectNode -> JsonType.Object
        is NullNode -> JsonType.Null
        else -> throw IllegalArgumentException("Don't know how to translate $value")
    }

    override fun String.asJsonObject(): JsonNode = mapper.readValue(this, JsonNode::class.java)
    override fun String?.asJsonValue(): JsonNode = this?.let { TextNode(this) } ?: NullNode.instance
    override fun Int?.asJsonValue(): JsonNode = this?.let { BigIntegerNode(toBigInteger()) } ?: NullNode.instance
    override fun Double?.asJsonValue(): JsonNode = this?.let { DecimalNode(BigDecimal(this)) } ?: NullNode.instance
    override fun Long?.asJsonValue(): JsonNode = this?.let { BigIntegerNode(toBigInteger()) } ?: NullNode.instance
    override fun BigDecimal?.asJsonValue(): JsonNode = this?.let { DecimalNode(this) } ?: NullNode.instance
    override fun BigInteger?.asJsonValue(): JsonNode = this?.let { BigIntegerNode(this) } ?: NullNode.instance
    override fun Boolean?.asJsonValue(): JsonNode = this?.let { BooleanNode.valueOf(this) } ?: NullNode.instance
    override fun > T.asJsonArray(): JsonNode =
        mapper.createArrayNode().also { it.addAll(toList()) }

    override fun JsonNode.asPrettyJsonString(): String =
        mapper.writerWithDefaultPrettyPrinter().writeValueAsString(this)

    override fun JsonNode.asCompactJsonString(): String = mapper.writeValueAsString(this)
    override fun >> LIST.asJsonObject(): JsonNode =
        mapper.createObjectNode().also { it.setAll(toList().toMap()) }

    override fun fields(node: JsonNode) = node.fields().asSequence().map { (key, value) -> key to value }.toList()

    override fun elements(value: JsonNode) = value.elements().asSequence().asIterable()
    override fun text(value: JsonNode): String = value.asText()
    override fun bool(value: JsonNode): Boolean = value.asBoolean()
    override fun integer(value: JsonNode) = value.asLong()
    override fun decimal(value: JsonNode) = BigDecimal(value.toString())
    override fun textValueOf(node: JsonNode, name: String) = node[name]?.asText()

    // auto
    override fun asJsonObject(input: Any): JsonNode = mapper.convertValue(input, JsonNode::class.java)

    override fun  asA(input: String, target: KClass): T = mapper.readValue(input, target.java)
    override fun  asA(j: JsonNode, target: KClass): T = mapper.convertValue(j, target.java)
    override fun  asA(input: InputStream, target: KClass): T = mapper.readValue(input, target.java)

    inline fun  JsonNode.asA(): T = mapper.convertValue(this)

    override fun asInputStream(input: Any): InputStream = mapper.writeValueAsBytes(input).inputStream()

    inline fun  WsMessage.Companion.auto() = WsMessage.string().map(mapper.read(), mapper.write())

    inline fun  asBiDiMapping() = BiDiMapping(mapper.read(), mapper.write())

    inline fun  Body.Companion.auto(
        description: String? = null,
        contentNegotiation: ContentNegotiation = None,
        contentType: ContentType = defaultContentType
    ) = autoBody(description, contentNegotiation, contentType)

    inline fun  autoBody(
        description: String? = null,
        contentNegotiation: ContentNegotiation = None,
        contentType: ContentType = defaultContentType
    ): BiDiBodyLensSpec =
        httpBodyLens(description, contentNegotiation, contentType).map(mapper.read(), mapper.write())

    /**
     * Convenience function to write the object as JSON to the message body and set the content type.
     */
    inline fun  R.json(t: T): R = with(Body.auto().toLens() of t)

    /**
     * Convenience function to read an object as JSON from the message body.
     */
    inline fun  HttpMessage.json(): T = Body.auto().toLens()(this)

    // views
    fun  T.asCompactJsonStringUsingView(v: KClass): String =
        mapper.writerWithView(v.java).writeValueAsString(this)

    fun  String.asUsingView(t: KClass, v: KClass): T =
        mapper.readerWithView(v.java).forType(t.java).readValue(this)

    inline fun  Body.Companion.autoView(
        description: String? = null,
        contentNegotiation: ContentNegotiation = None,
        contentType: ContentType = APPLICATION_JSON
    ) = Body.string(contentType, description, contentNegotiation)
        .map({ it.asUsingView(T::class, V::class) }, { it.asCompactJsonStringUsingView(V::class) })

    inline fun  WsMessage.Companion.autoView() =
        WsMessage.string().map({ it.asUsingView(T::class, V::class) }, { it.asCompactJsonStringUsingView(V::class) })

    fun  CloudEventBuilder.withData(t: T) =
        withData(defaultContentType.value, JsonCloudEventData.wrap(asJsonObject(t)))
}

fun KotlinModule.asConfigurable() = asConfigurable(ObjectMapper())

inline fun  ObjectMapper.read(): (String) -> T = { readValue(it) }

inline fun  ObjectMapper.write(): (T) -> String = {
    with(this) {
        val typeRef = jacksonTypeRef()
        when {
            typeFactory.constructType(typeRef).isContainerType -> writer().forType(typeRef).writeValueAsString(it)
            else -> writeValueAsString(it)
        }
    }
}

inline operator fun  ConfigurableJackson.invoke(msg: HttpMessage): T = autoBody().toLens()(msg)
inline operator fun  ConfigurableJackson.invoke(item: T) =
    autoBody().toLens().of(item)