001/*
002 *  Copyright 2014 Anyware Services
003 *
004 *  Licensed under the Apache License, Version 2.0 (the "License");
005 *  you may not use this file except in compliance with the License.
006 *  You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 *  Unless required by applicable law or agreed to in writing, software
011 *  distributed under the License is distributed on an "AS IS" BASIS,
012 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 *  See the License for the specific language governing permissions and
014 *  limitations under the License.
015 */
016package org.ametys.plugins.flipbook;
017
018import java.io.InputStream;
019
020import org.apache.commons.codec.digest.DigestUtils;
021import org.apache.excalibur.source.Source;
022import org.apache.tika.io.IOUtils;
023
024/**
025 * Implementation of a {@link AbstractConvertDocument2ImagesComponent} for an external resource
026 */
027public class ConvertExternalResource2ImagesComponent extends AbstractConvertDocument2ImagesComponent
028{   
029    /** Avalon ROLE. */
030    public static final String ROLE = ConvertExternalResource2ImagesComponent.class.getName();
031    
032    /**
033     * Put the file in cache
034     * @param resource the resource to cache
035     * @param path The resource path
036     * @param cacheDir The cache directory
037     * @param name The resource name
038     * @return The absolute cache path
039     * @throws Exception if an error occurs while caching the file
040     */
041    public String doCache(Source resource, String path, String cacheDir, String name) throws Exception
042    {
043        // Ensure the base folder exists.
044        String cachePath = _getCacheDirectory(path, cacheDir);
045        
046        InputStream is = null;
047        InputStream is2 = null;
048        try
049        {
050            is = resource.getInputStream();
051            String md5sum = DigestUtils.md5Hex(is);
052            
053            is2 = resource.getInputStream();
054            return cache(cachePath, md5sum, is2, name, path, resource.getMimeType());
055        }
056        finally
057        {
058            IOUtils.closeQuietly(is);
059            IOUtils.closeQuietly(is2);
060        }
061    }
062    
063    private String _getCacheDirectory(String path, String cacheDir)
064    {
065        StringBuilder buff = new StringBuilder();
066        
067        // Non-shared resources.
068        buff.append("/");
069        buff.append(cacheDir);
070        buff.append("/resources");
071        buff.append(path);
072        
073        return buff.toString();
074    }
075}