001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.wicket.util.image;
018
019import java.io.IOException;
020import java.io.InputStream;
021import java.util.Base64;
022
023import org.apache.wicket.request.resource.PackageResourceReference;
024import org.apache.wicket.util.io.IOUtils;
025import org.apache.wicket.util.resource.IResourceStream;
026import org.apache.wicket.util.resource.ResourceStreamNotFoundException;
027
028/**
029 * Util class to provide basic image functionality like converting image data to base64 content
030 *
031 * @author Tobias Soloschenko
032 * @since 6.20.0
033 *
034 */
035public class ImageUtil
036{
037
038        /**
039         * Creates a base64 encoded image string based on the given image reference
040         *
041         * @param imageReference
042         *            the image reference to create the base64 encoded image string of
043         * @param removeWhitespaces
044         *            if whitespaces should be removed from the output
045         * @return the base64 encoded image string
046         * @throws ResourceStreamNotFoundException
047         *             if the resource couldn't be found
048         * @throws IOException
049         *             if the stream couldn't be read
050         */
051        public static CharSequence createBase64EncodedImage(PackageResourceReference imageReference,
052                boolean removeWhitespaces) throws ResourceStreamNotFoundException, IOException
053        {
054                IResourceStream resourceStream = imageReference.getResource().getResourceStream();
055                InputStream inputStream = resourceStream.getInputStream();
056                try
057                {
058                        byte[] bytes = IOUtils.toByteArray(inputStream);
059                        String base64EncodedImage = Base64.getEncoder().encodeToString(bytes);
060                        return "data:" + resourceStream.getContentType() + ";base64," +
061                                (removeWhitespaces ? base64EncodedImage.replaceAll("\\s", "") : base64EncodedImage);
062                }
063                finally
064                {
065                        IOUtils.closeQuietly(inputStream);
066                }
067        }
068}