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

• buildUnsignedManifest

  protected static Manifest buildUnsignedManifest(Manifest manifest)

  Build a new manifest from the given one, removing any signing information inside it. This is done by removing any attributes containing some digest information. If an entry has then no more attributes, then it will not be written in the result manifest.

  Parameters:

  manifest - manifest to clean

  Returns:

  the build manifest with no digest attributes

  Since:

  1.3

• 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.

• isSignatureFile

  protected static boolean isSignatureFile(String entryName)

  Checks whether the specified JAR file entry denotes a signature-related file, i.e. matches META-INF/*.SF, META-INF/*.DSA, META-INF/*.RSA or META-INF/*.EC.

  Parameters:

  entryName - The name of the JAR file entry to check, must not be null.

  Returns:

  true if the entry is related to a signature, false otherwise.

• isManifestFile

  protected static boolean isManifestFile(String entryName)