1/**
2 * Copyright (c) 2008, http://www.snakeyaml.org
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *     http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16package org.yaml.snakeyaml.util;
17
18import java.io.UnsupportedEncodingException;
19import java.net.URLDecoder;
20import java.nio.ByteBuffer;
21import java.nio.CharBuffer;
22import java.nio.charset.CharacterCodingException;
23import java.nio.charset.Charset;
24import java.nio.charset.CharsetDecoder;
25import java.nio.charset.CodingErrorAction;
26
27import org.yaml.snakeyaml.error.YAMLException;
28import org.yaml.snakeyaml.external.com.google.gdata.util.common.base.Escaper;
29import org.yaml.snakeyaml.external.com.google.gdata.util.common.base.PercentEscaper;
30
31public abstract class UriEncoder {
32    private static final CharsetDecoder UTF8Decoder = Charset.forName("UTF-8").newDecoder()
33            .onMalformedInput(CodingErrorAction.REPORT);
34    // Include the [] chars to the SAFEPATHCHARS_URLENCODER to avoid
35    // its escape as required by spec. See
36    // http://yaml.org/spec/1.1/#escaping%20in%20URI/
37    private static final String SAFE_CHARS = PercentEscaper.SAFEPATHCHARS_URLENCODER + "[]/";
38    private static final Escaper escaper = new PercentEscaper(SAFE_CHARS, false);
39
40    /**
41     * Escape special characters with '%'
42     */
43    public static String encode(String uri) {
44        return escaper.escape(uri);
45    }
46
47    /**
48     * Decode '%'-escaped characters. Decoding fails in case of invalid UTF-8
49     */
50    public static String decode(ByteBuffer buff) throws CharacterCodingException {
51        CharBuffer chars = UTF8Decoder.decode(buff);
52        return chars.toString();
53    }
54
55    public static String decode(String buff) {
56        try {
57            return URLDecoder.decode(buff, "UTF-8");
58        } catch (UnsupportedEncodingException e) {
59            throw new YAMLException(e);
60        }
61    }
62}
63