Method Detail

• isZipFile

  public static boolean isZipFile(File file)

  Checks whether the specified file is a JAR file. For our purposes, a ZIP file is a ZIP stream with at least one entry.

  Parameters:

  file - The file to check, must not be null.

  Returns:

  true if the file looks like a ZIP file, false otherwise.

• unsignArchive

  public static void unsignArchive(File jarFile)
                            throws IOException

  Removes any existing signatures from the specified JAR file. We will stream from the input JAR directly to the output JAR to retain as much metadata from the original JAR as possible.

  Parameters:

  jarFile - The JAR file to unsign, must not be null.

  Throws:

  IOException

• isArchiveSigned

  public static boolean isArchiveSigned(File jarFile)
                                 throws IOException

  Scans an archive for existing signatures.

  Parameters:

  jarFile - The archive to scan, must not be null.

  Returns:

  true, if the archive contains at least one signature file; false, if the archive does not contain any signature files.

  Throws:

  IOException - if scanning jarFile fails.