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.util.logging.Level;
25 import java.util.logging.Logger;
26 import java.util.regex.Matcher;
27 import java.util.regex.Pattern;
29 import net.pterodactylus.sone.data.Sone;
30 import net.pterodactylus.util.logging.Logging;
31 import net.pterodactylus.util.template.TemplateFactory;
34 * {@link Parser} implementation that can recognize Freenet URIs.
36 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
38 public class FreenetLinkParser implements Parser {
41 private static final Logger logger = Logging.getLogger(FreenetLinkParser.class);
43 /** Pattern to detect whitespace. */
44 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]");
47 * Enumeration for all recognized link types.
49 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
51 private enum LinkType {
59 /** Link is an SSK. */
73 /** The template factory. */
74 private final TemplateFactory templateFactory;
76 /** The Sone that posted the currently parsed text. */
77 private Sone postingSone;
80 * Creates a new freenet link parser.
82 * @param templateFactory
83 * The template factory
85 public FreenetLinkParser(TemplateFactory templateFactory) {
86 this.templateFactory = templateFactory;
94 * Sets the Sone that posted the text that will be parsed in the next call
95 * to {@link #parse(Reader)}. You need to synchronize calling this method
96 * and {@link #parse(Reader)}!
99 * The Sone that posted the text
101 public void setPostingSone(Sone sone) {
113 public Part parse(Reader source) throws IOException {
114 PartContainer parts = new PartContainer();
115 BufferedReader bufferedReader = (source instanceof BufferedReader) ? (BufferedReader) source : new BufferedReader(source);
117 while ((line = bufferedReader.readLine()) != null) {
118 line = line.trim() + "\n";
119 while (line.length() > 0) {
120 int nextKsk = line.indexOf("KSK@");
121 int nextChk = line.indexOf("CHK@");
122 int nextSsk = line.indexOf("SSK@");
123 int nextUsk = line.indexOf("USK@");
124 int nextHttp = line.indexOf("http://");
125 int nextHttps = line.indexOf("https://");
126 if ((nextKsk == -1) && (nextChk == -1) && (nextSsk == -1) && (nextUsk == -1) && (nextHttp == -1) && (nextHttps == -1)) {
127 parts.add(createPlainTextPart(line));
130 int next = Integer.MAX_VALUE;
131 LinkType linkType = null;
132 if ((nextKsk > -1) && (nextKsk < next)) {
134 linkType = LinkType.KSK;
136 if ((nextChk > -1) && (nextChk < next)) {
138 linkType = LinkType.CHK;
140 if ((nextSsk > -1) && (nextSsk < next)) {
142 linkType = LinkType.SSK;
144 if ((nextUsk > -1) && (nextUsk < next)) {
146 linkType = LinkType.USK;
148 if ((nextHttp > -1) && (nextHttp < next)) {
150 linkType = LinkType.HTTP;
152 if ((nextHttps > -1) && (nextHttps < next)) {
154 linkType = LinkType.HTTPS;
156 if ((next >= 8) && (line.substring(next - 8, next).equals("freenet:"))) {
158 line = line.substring(0, next) + line.substring(next + 8);
160 Matcher matcher = whitespacePattern.matcher(line);
161 int nextSpace = matcher.find(next) ? matcher.start() : line.length();
162 if (nextSpace > (next + 4)) {
163 parts.add(createPlainTextPart(line.substring(0, next)));
164 String link = line.substring(next, nextSpace);
166 logger.log(Level.FINER, "Found link: %s", link);
167 logger.log(Level.FINEST, "Next: %d, CHK: %d, SSK: %d, USK: %d", new Object[] { next, nextChk, nextSsk, nextUsk });
168 if (linkType == LinkType.KSK) {
169 name = link.substring(4);
170 } else if ((linkType == LinkType.CHK) || (linkType == LinkType.SSK) || (linkType == LinkType.USK)) {
171 if (name.indexOf('/') > -1) {
172 if (!name.endsWith("/")) {
173 name = name.substring(name.lastIndexOf('/') + 1);
175 if (name.indexOf('/') != name.lastIndexOf('/')) {
176 name = name.substring(name.lastIndexOf('/', name.lastIndexOf('/') - 1));
178 /* shorten to 5 chars. */
179 name = name.substring(4, 9);
183 if (name.indexOf('?') > -1) {
184 name = name.substring(0, name.indexOf('?'));
186 boolean fromPostingSone = false;
187 if ((linkType == LinkType.SSK) || (linkType == LinkType.USK)) {
188 fromPostingSone = link.substring(4, 47).equals(postingSone.getId());
190 parts.add(fromPostingSone ? createTrustedFreenetLinkPart(link, name) : createFreenetLinkPart(link, name));
191 } else if ((linkType == LinkType.HTTP) || (linkType == LinkType.HTTPS)) {
192 name = link.substring(linkType == LinkType.HTTP ? 7 : 8);
193 int firstSlash = name.indexOf('/');
194 int lastSlash = name.lastIndexOf('/');
195 if ((lastSlash - firstSlash) > 3) {
196 name = name.substring(0, firstSlash + 1) + "…" + name.substring(lastSlash);
198 if (name.endsWith("/")) {
199 name = name.substring(0, name.length() - 1);
201 if (((name.indexOf('/') > -1) && (name.indexOf('.') < name.lastIndexOf('.', name.indexOf('/'))) || ((name.indexOf('/') == -1) && (name.indexOf('.') < name.lastIndexOf('.')))) && name.startsWith("www.")) {
202 name = name.substring(4);
204 if (name.indexOf('?') > -1) {
205 name = name.substring(0, name.indexOf('?'));
207 link = "?_CHECKED_HTTP_=" + link;
208 parts.add(createInternetLinkPart(link, name));
210 line = line.substring(nextSpace);
212 parts.add(createPlainTextPart(line.substring(0, next + 4)));
213 line = line.substring(next + 4);
225 * Creates a new plain text part based on a template.
228 * The text to display
229 * @return The part that displays the given text
231 private Part createPlainTextPart(String text) {
232 return new TemplatePart(templateFactory.createTemplate(new StringReader("<% text|html>"))).set("text", text);
236 * Creates a new part based on a template that links to a site within the
240 * The target of the link
242 * The name of the link
243 * @return The part that displays the link
245 private Part createInternetLinkPart(String link, String name) {
246 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);
250 * Creates a new part based on a template that links to a site within
254 * The target of the link
256 * The name of the link
257 * @return The part that displays the link
259 private Part createFreenetLinkPart(String link, String name) {
260 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);
264 * Creates a new part based on a template that links to a page in the
268 * The target of the link
270 * The name of the link
271 * @return The part that displays the link
273 private Part createTrustedFreenetLinkPart(String link, String name) {
274 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);