/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.tika.example;

import java.io.IOException;
import java.io.InputStream;
import java.security.GeneralSecurityException;
import java.security.Key;
import java.util.Collections;
import java.util.Set;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;

import org.apache.tika.exception.TikaException;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.mime.MediaType;
import org.apache.tika.parser.AbstractParser;
import org.apache.tika.parser.ParseContext;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;

public class EncryptedPrescriptionParser extends AbstractParser {
    private static final long serialVersionUID = -7816987249611278541L;

    public void parse(InputStream stream, ContentHandler handler,
                      Metadata metadata, ParseContext context) throws IOException,
            SAXException, TikaException {
        try {
            Key key = Pharmacy.getKey();
            Cipher cipher = Cipher.getInstance("RSA");
            cipher.init(Cipher.DECRYPT_MODE, key);
            InputStream decrypted = new CipherInputStream(stream, cipher);

            new PrescriptionParser().parse(decrypted, handler, metadata,
                    context);
        } catch (GeneralSecurityException e) {
            throw new TikaException("Unable to decrypt a digital prescription",
                    e);
        }
    }

    public Set<MediaType> getSupportedTypes(ParseContext context) {
        return Collections.singleton(MediaType.application("x-prescription"));
    }
}