How to resolve the algorithm Secure temporary file step by step in the Scala programming language

Published on 12 May 2024 09:40 PM

How to resolve the algorithm Secure temporary file step by step in the Scala programming language

Table of Contents

Problem Statement

Create a temporary file, securely and exclusively (opening it such that there are no possible race conditions). It's fine assuming local filesystem semantics (NFS or other networking filesystems can have signficantly more complicated semantics for satisfying the "no race conditions" criteria). The function should automatically resolve name collisions and should only fail in cases where permission is denied, the filesystem is read-only or full, or similar conditions exist (returning an error or raising an exception as appropriate to the language/environment).

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Secure temporary file step by step in the Scala programming language

Source code in the scala programming language

import java.io.{File, FileWriter, IOException}

  def writeStringToFile(file: File, data: String, appending: Boolean = false) =
    using(new FileWriter(file, appending))(_.write(data))

  def using[A <: {def close() : Unit}, B](resource: A)(f: A => B): B =
    try f(resource) finally resource.close()

  try {
    val file = File.createTempFile("_rosetta", ".passwd")
    // Just an example how you can fill a file
    using(new FileWriter(file))(writer => rawDataIter.foreach(line => writer.write(line)))
    scala.compat.Platform.collectGarbage() // JVM Windows related bug workaround JDK-4715154
    file.deleteOnExit()
    println(file)
  } catch {
    case e: IOException => println(s"Running Example failed: ${e.getMessage}")
  }


  

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