001 package ezvcard.util;
002
003 import java.net.URI;
004 import java.util.regex.Matcher;
005 import java.util.regex.Pattern;
006
007 import ezvcard.util.org.apache.commons.codec.binary.Base64;
008
009 /*
010 Copyright (c) 2013, Michael Angstadt
011 All rights reserved.
012
013 Redistribution and use in source and binary forms, with or without
014 modification, are permitted provided that the following conditions are met:
015
016 1. Redistributions of source code must retain the above copyright notice, this
017 list of conditions and the following disclaimer.
018 2. Redistributions in binary form must reproduce the above copyright notice,
019 this list of conditions and the following disclaimer in the documentation
020 and/or other materials provided with the distribution.
021
022 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
023 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
024 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
025 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
026 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
027 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
028 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
029 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
030 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
031 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
032
033 The views and conclusions contained in the software and documentation are those
034 of the authors and should not be interpreted as representing official policies,
035 either expressed or implied, of the FreeBSD Project.
036 */
037
038 /**
039 * <p>
040 * Represents a URI for encoding binary data.
041 * </p>
042 * <p>
043 * Example: {@code data:image/jpeg;base64,[base64 string]}
044 * </p>
045 * @author Michael Angstadt
046 */
047 public final class DataUri {
048 private static final Pattern regex = Pattern.compile("^data:(.*?);base64,(.*)", Pattern.CASE_INSENSITIVE);
049 private final byte[] data;
050 private final String contentType;
051
052 /**
053 * Creates a data URI.
054 * @param contentType the content type (e.g. "image/jpeg")
055 * @param data the binary data
056 */
057 public DataUri(String contentType, byte[] data) {
058 this.contentType = contentType;
059 this.data = data;
060 }
061
062 /**
063 * Parses a data URI string.
064 * @param uri the data URI to parse (e.g.
065 * "data:image/jpeg;base64,[base64 string]")
066 * @throws IllegalArgumentException if the given URI is not a valid data URI
067 */
068 public DataUri(String uri) {
069 Matcher m = regex.matcher(uri);
070 if (!m.find()) {
071 throw new IllegalArgumentException("Invalid data URI: " + uri);
072 }
073
074 contentType = m.group(1);
075 data = Base64.decodeBase64(m.group(2));
076 }
077
078 /**
079 * Gets the binary data.
080 * @return the binary data
081 */
082 public byte[] getData() {
083 return data;
084 }
085
086 /**
087 * Sets the content type.
088 * @return the content type (e.g. "image/jpeg")
089 */
090 public String getContentType() {
091 return contentType;
092 }
093
094 /**
095 * Creates a {@link URI} object from this data URI.
096 * @return the {@link URI} object
097 */
098 public URI toUri() {
099 return URI.create(toString());
100 }
101
102 @Override
103 public String toString() {
104 return "data:" + contentType + ";base64," + Base64.encodeBase64String(data);
105 }
106 }