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1   /**
2    * Copyright (c) 2008-2011, 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   */
16  
17  package org.yaml.snakeyaml.util;
18  
19  import java.io.UnsupportedEncodingException;
20  import java.net.URLDecoder;
21  import java.nio.ByteBuffer;
22  import java.nio.CharBuffer;
23  import java.nio.charset.CharacterCodingException;
24  import java.nio.charset.Charset;
25  import java.nio.charset.CharsetDecoder;
26  import java.nio.charset.CodingErrorAction;
27  
28  import org.yaml.snakeyaml.error.YAMLException;
29  import org.yaml.snakeyaml.external.com.google.gdata.util.common.base.Escaper;
30  import org.yaml.snakeyaml.external.com.google.gdata.util.common.base.PercentEscaper;
31  
32  public abstract class UriEncoder {
33      private static final CharsetDecoder UTF8Decoder = Charset.forName("UTF-8").newDecoder()
34              .onMalformedInput(CodingErrorAction.REPORT);
35      // Include the [] chars to the SAFEPATHCHARS_URLENCODER to avoid
36      // its escape as required by spec. See
37      // http://yaml.org/spec/1.1/#escaping%20in%20URI/
38      private static final String SAFE_CHARS = PercentEscaper.SAFEPATHCHARS_URLENCODER + "[]/";
39      private static final Escaper escaper = new PercentEscaper(SAFE_CHARS, false);
40  
41      /**
42       * Escape special characters with '%'
43       */
44      public static String encode(String uri) {
45          return escaper.escape(uri);
46      }
47  
48      /**
49       * Decode '%'-escaped characters. Decoding fails in case of invalid UTF-8
50       */
51      public static String decode(ByteBuffer buff) throws CharacterCodingException {
52          CharBuffer chars = UTF8Decoder.decode(buff);
53          return chars.toString();
54      }
55  
56      public static String decode(String buff) {
57          try {
58              return URLDecoder.decode(buff, "UTF-8");
59          } catch (UnsupportedEncodingException e) {
60              throw new YAMLException(e);
61          }
62      }
63  }