Upload Attachement on Corda Ledger

upload_attachement.kt

@PostMapping(value = ["uploadFile"], produces =[APPLICATION_JSON_VALUE])
	fun uploadFile(@RequestParam file: MultipartFile, @RequestParam uploader: String):ResponseEntity<String>{
		val filename = file.originalFilename
		val uploader = uploader
		require(filename != null) {"File Name must be set"}
		val hash: SecureHash = if(!(file.contentType == "zip" || file.contentType == "jar")){
			uploadZip(file.inputStream, uploader,filename!!)
		}else{
			proxy.uploadAttachmentWithMetadata(
			jar = file.inputStream,
			uploader = uploader,
			filename = filename!!
		)
	}
	return ResponseEntity.created(URI.create("attachments/$hash")).body("Attachment uploaded with hash - $hash")
}
	private fun uploadZip(inputStream: InputStream, uploader: String,filename:String): AttachmentId{
		val zipName = "$filename-${UUID.randomUUID()}.zip"
		FileOutputStream(zipName).use { fileOutputStream ->
		ZipOutputStream(fileOutputStream).use { zipOutputStream ->
			val zipEntry = ZipEntry(filename)
			zipOutputStream.putNextEntry(zipEntry)
			inputStream.copyTo(zipOutputStream, 1024)
		}
	}
	return FileInputStream(zipName).use { fileInputStream ->
		val hash = proxy.uploadAttachmentWithMetadata(
			jar = fileInputStream,
			uploader = uploader,
			filename = filename
		)
		Files.deleteIfExists(Paths.get(zipName))
	hash
	}
}