* `http`: padrão HTTP de sistemas autenticação, incluindo:
    * `bearer`: um header de `Authorization` com valor de `Bearer` adicionado de um token. Isso é herança do OAuth2.
    * HTTP Basic authentication.
    * HTTP Digest, etc.
* `oauth2`: todas as formas do OAuth2 para lidar com segurança (chamados "fluxos").
    * Vários desses fluxos são apropriados para construir um provedor de autenticação OAuth2 (como Google, Facebook, Twitter, GitHub, etc):

            md.update((byte) ( ( ms_usage >> 8 ) & 0xFF ));
            md.update((byte) ( ( ms_usage >> 16 ) & 0xFF ));
            md.update((byte) ( ( ms_usage >> 24 ) & 0xFF ));
            byte[] dgst = md.digest(data);
            mac.reset();
            mac.init(new SecretKeySpec(dk, HMAC_KEY));
            return mac.doFinal(dgst);
        }
        finally {
            Arrays.fill(dk, 0, dk.length, (byte) 0);
        }

        this.fid = fid;
        this.offset = (int) ( offset & 0xFFFFFFFFL );
        this.remaining = remaining;
        this.b = b;
        this.off = off;
        this.count = len;
        this.digest = null; /*
                             * otherwise recycled commands
                             * like writeandx will choke if session
                             * closes in between
                             */
    }

        dstIndex += writeHeaderWireFormat( dst, dstIndex );
        dstIndex += writeAndXWireFormat( dst, dstIndex );
        length = dstIndex - start;

        if( digest != null ) {
            digest.sign( dst, headerStart, length, this, response );
        }

        return length;
    }

    /*
     * We overload this because we want readAndXWireFormat to

                MessageDigest md4 = Crypto.getMD4();
                md4.update(passwordHash);
                byte[] userSessionKey = md4.digest();

                MessageDigest hmac = Crypto.getHMACT64(userSessionKey);
                hmac.update(sessionNonce);
                byte[] ntlm2SessionKey = hmac.digest();

                if ( getFlag(NTLMSSP_NEGOTIATE_KEY_EXCH) ) {
                    this.masterKey = new byte[16];

                    byte[] b, int off, int len ) {
        this.fid = fid;
        this.offset = offset;
        this.remaining = remaining;
        this.b = b;
        this.off = off;
        dataLength = len;
        digest = null; /* otherwise recycled commands
                        * like writeandx will choke if session
                        * closes in between */
    }
    int getBatchLimit( byte command ) {

                    MD4 md4 = new MD4();
                    md4.update(responseKeyNT);
                    byte[] userSessionKey = md4.digest();

                    HMACT64 hmac = new HMACT64(userSessionKey);
                    hmac.update(sessionNonce);
                    byte[] ntlm2SessionKey = hmac.digest();

                    if ((getFlags() & NTLMSSP_NEGOTIATE_KEY_EXCH) != 0) {
                        masterKey = new byte[16];

                    // NOP
                }
            }
        }

        final String id = encodedBuf.toString();
        return MessageDigestUtil.digest(ComponentUtil.getFessConfig().getIndexIdDigestAlgorithm(), id);
    }

    public void setMaxSessionIdsInList(final int maxSessionIdsInList) {
        this.maxSessionIdsInList = maxSessionIdsInList;
    }

    }

    private AuthScheme getAuthScheme() {
        final String scheme = getProtocolScheme();
        if (Constants.BASIC.equals(scheme)) {
            return new BasicScheme();
        }
        if (Constants.DIGEST.equals(scheme)) {
            return new DigestScheme();
        }
        if (Constants.NTLM.equals(scheme)) {
            final Properties props = new Properties();

      },
      "timestamp": {
        "type": "date",
        "format": "date_optional_time"
      },
      "expires": {
        "type": "date",
        "format": "date_optional_time"
      },
      "digest": {
        "type": "text",
        "index": false
      },
      "doc_id": {
        "type": "keyword"
      },
      "favorite_count": {
        "type": "long"
      },
      "filename": {