private void readKeyRing()

in src/main/java/org/apache/sling/cli/impl/pgp/PGPSignatureValidator.java [92:134]
43 lines of code
8 McCabe index (conditional complexity)

    private void readKeyRing(ComponentContext componentContext) {
        ComponentContextHelper helper = ComponentContextHelper.wrap(componentContext);
        String keysFile = helper.getProperty("sling.keys", KEYS_FILE);
        Path keysFilePath = Paths.get(keysFile);
        if (Files.notExists(keysFilePath)) {
            try {
                try (CloseableHttpClient client = httpClientFactory.newClient()) {
                    HttpGet get = new HttpGet(KEYS_FILE_URL);
                    try (CloseableHttpResponse response = client.execute(get)) {
                        try (InputStream content = response.getEntity().getContent()) {
                            IOUtils.copy(content, new FileOutputStream(keysFilePath.toFile()));
                        }
                    }
                }
            } catch (IOException e) {
                throw new IllegalStateException(
                        "Cannot download Sling key file from " + KEYS_FILE_URL, e);
            }
        }
        try (InputStream in = Files.newInputStream(keysFilePath)) {
            InputStream bouncyIn = org.bouncycastle.openpgp.PGPUtil.getDecoderStream(in);
            if (bouncyIn instanceof ArmoredInputStream) {
                ArmoredInputStream as = (ArmoredInputStream) bouncyIn;
                List<PGPPublicKeyRing> keyRings = new ArrayList<>();
                while (!as.isEndOfStream()) {
                    PGPPublicKeyRingCollection collection = new PGPPublicKeyRingCollection(as,
                            new JcaKeyFingerprintCalculator());
                    Iterator<PGPPublicKeyRing> readKeyRings = collection.getKeyRings();
                    while (readKeyRings.hasNext()) {
                        PGPPublicKeyRing keyRing = readKeyRings.next();
                        keyRings.add(keyRing);
                    }
                }
                if (!keyRings.isEmpty()) {
                    keyRingCollection = new PGPPublicKeyRingCollection(keyRings);
                } else {
                    throw new IllegalStateException(String.format("Sling keys file from %s does not contain any keys.", keysFile));
                }
            }
        } catch (IOException | PGPException e) {
            throw new IllegalStateException(String.format("Cannot read Sling keys file at %s.", keysFile), e);
        }
    }