1 package org.eclipse.aether.transport.file;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 /**
23 * URL handling for file URLs. Based on org.apache.maven.wagon.PathUtils.
24 */
25 final class PathUtils
26 {
27
28 private PathUtils()
29 {
30 }
31
32 /**
33 * Return the protocol name. <br/>
34 * E.g: for input <code>http://www.codehause.org</code> this method will return <code>http</code>
35 *
36 * @param url the url
37 * @return the host name
38 */
39 public static String protocol( final String url )
40 {
41 final int pos = url.indexOf( ":" );
42
43 if ( pos == -1 )
44 {
45 return "";
46 }
47 return url.substring( 0, pos ).trim();
48 }
49
50 /**
51 * Derive the path portion of the given URL.
52 *
53 * @param url the file-repository URL
54 * @return the basedir of the repository
55 */
56 public static String basedir( String url )
57 {
58 String protocol = PathUtils.protocol( url );
59
60 String retValue = null;
61
62 if ( protocol.length() > 0 )
63 {
64 retValue = url.substring( protocol.length() + 1 );
65 }
66 else
67 {
68 retValue = url;
69 }
70 retValue = decode( retValue );
71 // special case: if omitted // on protocol, keep path as is
72 if ( retValue.startsWith( "//" ) )
73 {
74 retValue = retValue.substring( 2 );
75
76 if ( retValue.length() >= 2 && ( retValue.charAt( 1 ) == '|' || retValue.charAt( 1 ) == ':' ) )
77 {
78 // special case: if there is a windows drive letter, then keep the original return value
79 retValue = retValue.charAt( 0 ) + ":" + retValue.substring( 2 );
80 }
81 else
82 {
83 // Now we expect the host
84 int index = retValue.indexOf( "/" );
85 if ( index >= 0 )
86 {
87 retValue = retValue.substring( index + 1 );
88 }
89
90 // special case: if there is a windows drive letter, then keep the original return value
91 if ( retValue.length() >= 2 && ( retValue.charAt( 1 ) == '|' || retValue.charAt( 1 ) == ':' ) )
92 {
93 retValue = retValue.charAt( 0 ) + ":" + retValue.substring( 2 );
94 }
95 else if ( index >= 0 )
96 {
97 // leading / was previously stripped
98 retValue = "/" + retValue;
99 }
100 }
101 }
102
103 // special case: if there is a windows drive letter using |, switch to :
104 if ( retValue.length() >= 2 && retValue.charAt( 1 ) == '|' )
105 {
106 retValue = retValue.charAt( 0 ) + ":" + retValue.substring( 2 );
107 }
108
109 return retValue.trim();
110 }
111
112 /**
113 * Decodes the specified (portion of a) URL. <strong>Note:</strong> This decoder assumes that ISO-8859-1 is used to
114 * convert URL-encoded octets to characters.
115 *
116 * @param url The URL to decode, may be <code>null</code>.
117 * @return The decoded URL or <code>null</code> if the input was <code>null</code>.
118 */
119 static String decode( String url )
120 {
121 String decoded = url;
122 if ( url != null )
123 {
124 int pos = -1;
125 while ( ( pos = decoded.indexOf( '%', pos + 1 ) ) >= 0 )
126 {
127 if ( pos + 2 < decoded.length() )
128 {
129 String hexStr = decoded.substring( pos + 1, pos + 3 );
130 char ch = (char) Integer.parseInt( hexStr, 16 );
131 decoded = decoded.substring( 0, pos ) + ch + decoded.substring( pos + 3 );
132 }
133 }
134 }
135 return decoded;
136 }
137
138 }