Spring Boot multipart file upload server

import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

plugins {
	id("org.springframework.boot") version "2.2.1.RELEASE"
	id("io.spring.dependency-management") version "1.0.8.RELEASE"
	kotlin("jvm") version "1.3.60"
	kotlin("plugin.spring") version "1.3.60"
}

group = "com.shunya"
version = "0.0.1-SNAPSHOT"
java.sourceCompatibility = JavaVersion.VERSION_11

repositories {
	mavenCentral()
}

dependencies {
	implementation("org.springframework.boot:spring-boot-starter-web")
	implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
	implementation("org.jetbrains.kotlin:kotlin-reflect")
	implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
	testImplementation("org.springframework.boot:spring-boot-starter-test") {
		exclude(group = "org.junit.vintage", module = "junit-vintage-engine")
	}
}

tasks.withType<Test> {
	useJUnitPlatform()
}

tasks.withType<KotlinCompile> {
	kotlinOptions {
		freeCompilerArgs = listOf("-Xjsr305=strict")
		jvmTarget = "11"
	}
}

import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.boot.runApplication

@SpringBootApplication
class App

fun main(args: Array<String>) {
	runApplication<App>(*args)
}

import org.slf4j.LoggerFactory
import org.springframework.web.bind.annotation.PostMapping
import org.springframework.web.bind.annotation.RequestParam
import org.springframework.web.bind.annotation.RestController
import org.springframework.web.multipart.MultipartFile
import java.io.BufferedReader

@RestController
class FileUploadController {

    val logger = LoggerFactory.getLogger(FileUploadController::class.java)

    @PostMapping("/fileupload")
    fun handleFileUpload(@RequestParam("file") file: MultipartFile): ServiceResponse {
        logger.info("handling fileupload for {}", file.name)
        val content = file.inputStream.bufferedReader().use(BufferedReader::readText)
        logger.info("file content = {}", content)
        return ServiceResponse.ok(content)
    }
}

data class ServiceResponse(val isSuccess: Boolean,
                           val data: String? = null) {

    companion object {
        fun ok(data: String): ServiceResponse {
            return ServiceResponse(isSuccess = true, data = data)
        }

        fun fail(): ServiceResponse {
            return ServiceResponse(isSuccess = false)
        }
    }
}

spring.servlet.multipart.max-file-size=1MB
spring.servlet.multipart.max-request-size=1MB