Examples with LookaheadInputStream org.apache.tika.io.LookaheadInputStream used on opensource projects

Example 1 with LookaheadInputStream

use of org.apache.tika.io.LookaheadInputStream in project tika by apache.

the class EncryptedPrescriptionDetector method detect.

public MediaType detect(InputStream stream, Metadata metadata) throws IOException {
    Key key = Pharmacy.getKey();
    MediaType type = MediaType.OCTET_STREAM;
    try (InputStream lookahead = new LookaheadInputStream(stream, 1024)) {
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, key);
        InputStream decrypted = new CipherInputStream(lookahead, cipher);
        QName name = new XmlRootExtractor().extractRootElement(decrypted);
        if (name != null && "http://example.com/xpd".equals(name.getNamespaceURI()) && "prescription".equals(name.getLocalPart())) {
            type = MediaType.application("x-prescription");
        }
    } catch (GeneralSecurityException e) {
    // unable to decrypt, fall through
    }
    return type;
}