001 package org.apache.archiva.web.startup;
002
003 /*
004 * Licensed to the Apache Software Foundation (ASF) under one
005 * or more contributor license agreements. See the NOTICE file
006 * distributed with this work for additional information
007 * regarding copyright ownership. The ASF licenses this file
008 * to you under the Apache License, Version 2.0 (the
009 * "License"); you may not use this file except in compliance
010 * with the License. You may obtain a copy of the License at
011 *
012 * http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing,
015 * software distributed under the License is distributed on an
016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017 * KIND, either express or implied. See the License for the
018 * specific language governing permissions and limitations
019 * under the License.
020 */
021
022 import org.apache.commons.lang.StringUtils;
023 import org.slf4j.LoggerFactory;
024
025 import java.util.regex.Matcher;
026 import java.util.regex.Pattern;
027
028 /**
029 * Banner
030 *
031 *
032 */
033 public class Banner
034 {
035 private static final String eol = System.getProperty("line.separator");
036
037 public static String encode( String raw )
038 {
039 // Canonicalize line ends to make them easier to process
040 raw = raw.replace("\r\n", "\n").replace("\r", "\n");
041
042 StringBuilder encoded = new StringBuilder();
043 int rawlen = raw.length();
044
045 for ( int i = 0; i < rawlen; i++ )
046 {
047 char c = raw.charAt( i );
048 if ( c == '\\' )
049 {
050 encoded.append( "$." );
051 }
052 else if ( c == '$' )
053 {
054 encoded.append( "$$" );
055 }
056 else if ( c == '\n' )
057 {
058 encoded.append( "$n" );
059 }
060 else if ( Character.isDigit( c ) )
061 {
062 encoded.append( c );
063 }
064 else if ( Character.isLetter( c ) )
065 {
066 encoded.append( rot13( c ) );
067 }
068 else if ( i < raw.length() - 1 )
069 {
070 char nc;
071 boolean done = false;
072 int count = 0;
073 for ( int n = i; !done; n++ )
074 {
075 if ( n >= rawlen )
076 {
077 break;
078 }
079
080 nc = raw.charAt( n );
081
082 if ( nc != c )
083 {
084 done = true;
085 }
086 else
087 {
088 count++;
089 }
090 }
091 if ( count < 3 )
092 {
093 encoded.append( c );
094 }
095 else
096 {
097 encoded.append( "$" ).append( String.valueOf( count ) ).append( c );
098 i += count - 1;
099 }
100 }
101 else
102 {
103 encoded.append( c );
104 }
105 }
106
107 return encoded.toString();
108 }
109
110 public static String decode( String encoded )
111 {
112 StringBuilder decoded = new StringBuilder();
113 int enlen = encoded.length();
114 for ( int i = 0; i < enlen; i++ )
115 {
116 char c = encoded.charAt( i );
117 if ( c == '$' )
118 {
119 char nc = encoded.charAt( i + 1 );
120 if ( nc == '$' )
121 {
122 decoded.append( '$' );
123 i++;
124 }
125 else if ( nc == '.' )
126 {
127 decoded.append( '\\' );
128 i++;
129 }
130 else if ( nc == 'n' )
131 {
132 decoded.append( eol );
133 i++;
134 }
135 else if ( Character.isDigit( nc ) )
136 {
137 int count = 0;
138 int nn = i + 1;
139 while ( Character.isDigit( nc ) )
140 {
141 count = ( count * 10 );
142 count += ( nc - '0' );
143 nc = encoded.charAt( ++nn );
144 }
145 for ( int d = 0; d < count; d++ )
146 {
147 decoded.append( nc );
148 }
149 i = nn;
150 }
151 }
152 else if ( Character.isLetter( c ) )
153 {
154 decoded.append( rot13( c ) );
155 }
156 else
157 {
158 decoded.append( c );
159 }
160 }
161
162 return decoded.toString();
163 }
164
165 private static char rot13( char c )
166 {
167 if ( ( c >= 'a' ) && ( c <= 'z' ) )
168 {
169 char dc = c += 13;
170 if ( dc > 'z' )
171 {
172 dc -= 26;
173 }
174 return dc;
175 }
176 else if ( ( c >= 'A' ) && ( c <= 'Z' ) )
177 {
178 char dc = c += 13;
179 if ( dc > 'Z' )
180 {
181 dc -= 26;
182 }
183 return dc;
184 }
185 else
186 {
187 return c;
188 }
189 }
190
191 public static String injectVersion( String text, String version )
192 {
193 Pattern pat = Pattern.compile( "#{2,}" );
194 Matcher mat = pat.matcher( text );
195 StringBuilder ret = new StringBuilder();
196 int off = 0;
197
198 while ( mat.find( off ) )
199 {
200 ret.append( text.substring( off, mat.start() ) );
201 String repl = mat.group();
202 ret.append( StringUtils.center( version, repl.length() ) );
203 off = mat.end();
204 }
205
206 ret.append( text.substring( off ) );
207
208 return ret.toString();
209 }
210
211 public static String getBanner( String version )
212 {
213 String encodedBanner = "$26 $34_$n$15 /$._$7 /$34 $.$n$14 /`/@),$4 | Ba" +
214 " orunys bs nyy bs gur nycnpnf |$n$14 | (~' __| gbvyvat njnl ba " +
215 "gur Ncnpur Nepuvin |$n$6 _,--.$3_/ |$4 $.$5 cebwrpg grnz, V jbhyq y" +
216 "vxr gb$3 |$n$4 ,' ,$5 ($3 |$5 $.$5 jrypbzr lbh gb Nepuvin$6 |$" +
217 "n$4 | ($6 $. /$6 | $32# |$n$5 $. )$._/ ,_/$7 |$36 |$n$5 / /$3 " +
218 "( |/$9 | uggc://nepuvin.ncnpur.bet/ |$n$4 ( |$4 ( |$10 | hf" +
219 "ref@nepuvin.ncnpur.bet$7 |$n$5 $.|$5 $.|$11 $.$34_/$n$n";
220
221 return injectVersion( decode( encodedBanner ), version );
222 }
223
224 public static void display( String version )
225 {
226 String banner = getBanner( version );
227 LoggerFactory.getLogger( Banner.class ).info( StringUtils.repeat( "_", 25 ) + eol + banner );
228 }
229 }