private void unpack()

in src/main/java/org/apache/sling/feature/extension/unpack/Unpack.java [182:221]
37 lines of code
15 McCabe index (conditional complexity)

    private void unpack(String dir, InputStream stream, boolean override, String index) throws IOException {
        File base = new File(dir);
        if (!base.isDirectory() && !base.mkdirs()) {
            throw new IOException("Unable to find or created base dir: " + base);
        }

        try (JarInputStream jarInputStream = new JarInputStream(stream)) {
            String indexValue = null;
            if (index != null) {
                Manifest mf = jarInputStream.getManifest();
                if (mf != null) {
                    indexValue = mf.getMainAttributes().getValue(index);
                }
            }

            List<String> roots = parseRoots(indexValue);
            for (ZipEntry entry = jarInputStream.getNextEntry(); entry != null; entry = jarInputStream.getNextEntry()) {
                if (!entry.isDirectory() && !entry.getName().toLowerCase().startsWith("meta-inf/") && isRoot(roots, entry.getName())) {
                    File target = new File(base, relativize(roots, entry.getName()));
                    if (target.getParentFile().toPath().startsWith(base.toPath())) {
                        if (target.getParentFile().isDirectory() || target.getParentFile().mkdirs()) {
                            if (override) {
                                Files.copy(jarInputStream, target.toPath(), StandardCopyOption.REPLACE_EXISTING);
                            } else if (!target.exists()) {
                                try {
                                    Files.copy(jarInputStream, target.toPath());
                                } catch (FileAlreadyExistsException ex) {

                                }
                            }
                        } else {
                            throw new IOException("Can't create parent dir:" + target.getParentFile());
                        }
                    } else {
                        throw new IOException("Zip slip detected for: " + entry.getName());
                    }
                }
            }
        }
    }