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KotlinSerializationMessageBodyWriter.kt
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KotlinSerializationMessageBodyWriter.kt
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package io.quarkus.kotlin.serialization
import kotlinx.serialization.ExperimentalSerializationApi
import kotlinx.serialization.json.Json
import kotlinx.serialization.json.encodeToStream
import kotlinx.serialization.serializer
import org.jboss.resteasy.reactive.common.providers.serialisers.JsonMessageBodyWriterUtil
import org.jboss.resteasy.reactive.server.spi.ServerMessageBodyWriter.AllWriteableMessageBodyWriter
import org.jboss.resteasy.reactive.server.spi.ServerRequestContext
import java.io.OutputStream
import java.lang.reflect.Type
import java.nio.charset.StandardCharsets
import javax.ws.rs.Produces
import javax.ws.rs.core.MediaType
import javax.ws.rs.core.MultivaluedMap
@Produces("application/json", "application/*+json", "text/json")
@OptIn(ExperimentalSerializationApi::class)
class KotlinSerializationMessageBodyWriter(private val json: Json) : AllWriteableMessageBodyWriter() {
override fun writeTo(
o: Any,
type: Class<*>,
genericType: Type,
annotations: Array<Annotation>,
mediaType: MediaType,
httpHeaders: MultivaluedMap<String, Any>,
entityStream: OutputStream
) {
JsonMessageBodyWriterUtil.setContentTypeIfNecessary(httpHeaders)
if (o is String) { // YUK: done in order to avoid adding extra quotes...
entityStream.write(o.toByteArray(StandardCharsets.UTF_8))
} else {
json.encodeToStream(serializer(genericType), o, entityStream)
}
}
override fun writeResponse(o: Any, genericType: Type, context: ServerRequestContext) {
val originalStream = context.orCreateOutputStream
val stream: OutputStream = NoopCloseAndFlushOutputStream(originalStream)
if (o is String) { // YUK: done in order to avoid adding extra quotes...
stream.write(o.toByteArray(StandardCharsets.UTF_8))
} else {
json.encodeToStream(serializer(genericType), o, stream)
}
// we don't use try-with-resources because that results in writing to the http output without the exception mapping coming into play
originalStream.close()
}
private class NoopCloseAndFlushOutputStream(private val delegate: OutputStream) : OutputStream() {
override fun flush() {}
override fun close() {}
override fun write(b: Int) {
delegate.write(b)
}
override fun write(b: ByteArray) {
delegate.write(b)
}
override fun write(b: ByteArray, off: Int, len: Int) {
delegate.write(b, off, len)
}
}
}