2 * Sone - FreenetLinkParser.java - Copyright © 2010 David Roden
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 package net.pterodactylus.sone.text;
20 import java.io.BufferedReader;
21 import java.io.IOException;
22 import java.io.Reader;
23 import java.io.StringReader;
24 import java.net.MalformedURLException;
25 import java.util.logging.Level;
26 import java.util.logging.Logger;
27 import java.util.regex.Matcher;
28 import java.util.regex.Pattern;
30 import net.pterodactylus.util.logging.Logging;
31 import net.pterodactylus.util.template.TemplateFactory;
32 import freenet.keys.FreenetURI;
35 * {@link Parser} implementation that can recognize Freenet URIs.
37 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
39 public class FreenetLinkParser implements Parser<FreenetLinkParserContext> {
42 private static final Logger logger = Logging.getLogger(FreenetLinkParser.class);
44 /** Pattern to detect whitespace. */
45 private static final Pattern whitespacePattern = Pattern.compile("[\\u000a\u0020\u00a0\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u200b\u200c\u200d\u202f\u205f\u2060\u2800\u3000]");
48 * Enumeration for all recognized link types.
50 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
52 private enum LinkType {
60 /** Link is an SSK. */
74 /** The template factory. */
75 private final TemplateFactory templateFactory;
78 * Creates a new freenet link parser.
80 * @param templateFactory
81 * The template factory
83 public FreenetLinkParser(TemplateFactory templateFactory) {
84 this.templateFactory = templateFactory;
95 public Part parse(FreenetLinkParserContext context, Reader source) throws IOException {
96 PartContainer parts = new PartContainer();
97 BufferedReader bufferedReader = (source instanceof BufferedReader) ? (BufferedReader) source : new BufferedReader(source);
99 while ((line = bufferedReader.readLine()) != null) {
100 line = line.trim() + "\n";
101 while (line.length() > 0) {
102 int nextKsk = line.indexOf("KSK@");
103 int nextChk = line.indexOf("CHK@");
104 int nextSsk = line.indexOf("SSK@");
105 int nextUsk = line.indexOf("USK@");
106 int nextHttp = line.indexOf("http://");
107 int nextHttps = line.indexOf("https://");
108 if ((nextKsk == -1) && (nextChk == -1) && (nextSsk == -1) && (nextUsk == -1) && (nextHttp == -1) && (nextHttps == -1)) {
109 parts.add(createPlainTextPart(line));
112 int next = Integer.MAX_VALUE;
113 LinkType linkType = null;
114 if ((nextKsk > -1) && (nextKsk < next)) {
116 linkType = LinkType.KSK;
118 if ((nextChk > -1) && (nextChk < next)) {
120 linkType = LinkType.CHK;
122 if ((nextSsk > -1) && (nextSsk < next)) {
124 linkType = LinkType.SSK;
126 if ((nextUsk > -1) && (nextUsk < next)) {
128 linkType = LinkType.USK;
130 if ((nextHttp > -1) && (nextHttp < next)) {
132 linkType = LinkType.HTTP;
134 if ((nextHttps > -1) && (nextHttps < next)) {
136 linkType = LinkType.HTTPS;
138 if ((next >= 8) && (line.substring(next - 8, next).equals("freenet:"))) {
140 line = line.substring(0, next) + line.substring(next + 8);
142 Matcher matcher = whitespacePattern.matcher(line);
143 int nextSpace = matcher.find(next) ? matcher.start() : line.length();
144 if (nextSpace > (next + 4)) {
145 parts.add(createPlainTextPart(line.substring(0, next)));
146 String link = line.substring(next, nextSpace);
148 logger.log(Level.FINER, "Found link: %s", link);
149 logger.log(Level.FINEST, "Next: %d, CHK: %d, SSK: %d, USK: %d", new Object[] { next, nextChk, nextSsk, nextUsk });
150 if (linkType == LinkType.KSK) {
151 name = link.substring(4);
152 } else if ((linkType == LinkType.CHK) || (linkType == LinkType.SSK) || (linkType == LinkType.USK)) {
153 if (name.indexOf('/') > -1) {
154 if (!name.endsWith("/")) {
155 name = name.substring(name.lastIndexOf('/') + 1);
157 if (name.indexOf('/') != name.lastIndexOf('/')) {
158 name = name.substring(name.lastIndexOf('/', name.lastIndexOf('/') - 1));
160 /* shorten to 5 chars. */
161 name = name.substring(4, Math.min(9, name.length()));
165 if (name.indexOf('?') > -1) {
166 name = name.substring(0, name.indexOf('?'));
168 boolean fromPostingSone = false;
169 if ((linkType == LinkType.SSK) || (linkType == LinkType.USK)) {
171 new FreenetURI(link);
172 fromPostingSone = link.substring(4, Math.min(link.length(), 47)).equals(context.getPostingSone().getId());
173 parts.add(fromPostingSone ? createTrustedFreenetLinkPart(link, name) : createFreenetLinkPart(link, name));
174 } catch (MalformedURLException mue1) {
175 /* it’s not a valid link. */
176 parts.add(createPlainTextPart(link));
179 parts.add(fromPostingSone ? createTrustedFreenetLinkPart(link, name) : createFreenetLinkPart(link, name));
181 } else if ((linkType == LinkType.HTTP) || (linkType == LinkType.HTTPS)) {
182 name = link.substring(linkType == LinkType.HTTP ? 7 : 8);
183 int firstSlash = name.indexOf('/');
184 int lastSlash = name.lastIndexOf('/');
185 if ((lastSlash - firstSlash) > 3) {
186 name = name.substring(0, firstSlash + 1) + "…" + name.substring(lastSlash);
188 if (name.endsWith("/")) {
189 name = name.substring(0, name.length() - 1);
191 if (((name.indexOf('/') > -1) && (name.indexOf('.') < name.lastIndexOf('.', name.indexOf('/'))) || ((name.indexOf('/') == -1) && (name.indexOf('.') < name.lastIndexOf('.')))) && name.startsWith("www.")) {
192 name = name.substring(4);
194 if (name.indexOf('?') > -1) {
195 name = name.substring(0, name.indexOf('?'));
197 link = "?_CHECKED_HTTP_=" + link;
198 parts.add(createInternetLinkPart(link, name));
200 line = line.substring(nextSpace);
202 parts.add(createPlainTextPart(line.substring(0, next + 4)));
203 line = line.substring(next + 4);
215 * Creates a new plain text part based on a template.
218 * The text to display
219 * @return The part that displays the given text
221 private Part createPlainTextPart(String text) {
222 return new TemplatePart(templateFactory.createTemplate(new StringReader("<% text|html>"))).set("text", text);
226 * Creates a new part based on a template that links to a site within the
230 * The target of the link
232 * The name of the link
233 * @return The part that displays the link
235 private Part createInternetLinkPart(String link, String name) {
236 return new TemplatePart(templateFactory.createTemplate(new StringReader("<a class=\"internet\" href=\"/<% link|html>\" title=\"<% link|html>\"><% name|html></a>"))).set("link", link).set("name", name);
240 * Creates a new part based on a template that links to a site within
244 * The target of the link
246 * The name of the link
247 * @return The part that displays the link
249 private Part createFreenetLinkPart(String link, String name) {
250 return new TemplatePart(templateFactory.createTemplate(new StringReader("<a class=\"freenet\" href=\"/<% link|html>\" title=\"<% link|html>\"><% name|html></a>"))).set("link", link).set("name", name);
254 * Creates a new part based on a template that links to a page in the
258 * The target of the link
260 * The name of the link
261 * @return The part that displays the link
263 private Part createTrustedFreenetLinkPart(String link, String name) {
264 return new TemplatePart(templateFactory.createTemplate(new StringReader("<a class=\"freenet-trusted\" href=\"/<% link|html>\" title=\"<% link|html>\"><% name|html></a>"))).set("link", link).set("name", name);