fun localFileFromRequestUri(basePath: File, uri: URI): File {
    val basePathElements = basePath.absolutePath.split(File.separator).filter { it.isNotEmpty() }.toMutableSet()
    val clientPathElements = uri.path.substring(1).split(File.separatorChar)
    val filteredPathElements = clientPathElements.mapNotNull {
        if (!basePathElements.remove(it)) {
            it
        } else {
            null
        }
    }.joinToString(separator = File.separator) { it }

    return File(basePath, filteredPathElements)
}