UploadAttachement.kt

@PostMapping(value = ["uploadFile"], produces =[APPLICATION_JSON_VALUE])
    fun uploadFile(@RequestParam file: MultipartFile, @RequestParam uploadBy: String):ResponseEntity<String>{
        val filename = file.originalFilename
        val uploadBy = uploadBy
        require(filename != null) {"File Must be Selected"}
        val hash: SecureHash = if(!(file.contentType == "zip")){
                upload(file.inputStream, uploadBy,filename!!)
        }else{
            proxy.uploadAttachmentWithMetadata(
                    jar = file.inputStream,
                    uploadBy = uploadBy,
                    filename = filename!!
            )

        }

        return ResponseEntity.created(URI.create("attachments/$hash")).body("Attachment uploaded - $hash")
    }

   private  fun upload(inputStream: InputStream, uploadeBy: String,filename:String): AttachmentId{
        val zip = "$filename-${UUID.randomUUID()}.zip"
       FileOutputStream(zip).use { fileOutputStream ->
           ZipOutputStream(fileOutputStream).use { zipOutputStream ->
               val zipEntry = ZipEntry(filename)
               zipOutputStream.putNextEntry(zipEntry)
               inputStream.copyTo(zipOutputStream, 1024)
           }
       }
       return FileInputStream(zip).use { fileInputStream ->
           val hash = proxy.uploadAttachmentWithMetadata(
                   jar = fileInputStream,
                   uploadeBy = uploadeBy,
                   filename = filename
           )
           Files.deleteIfExists(Paths.get(zip))
           hash
       }
    }