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.TemplateContextFactory;
32 import net.pterodactylus.util.template.TemplateParser;
33 import freenet.keys.FreenetURI;
36 * {@link Parser} implementation that can recognize Freenet URIs.
38 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
40 public class FreenetLinkParser implements Parser<FreenetLinkParserContext> {
43 private static final Logger logger = Logging.getLogger(FreenetLinkParser.class);
45 /** Pattern to detect whitespace. */
46 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]");
49 * Enumeration for all recognized link types.
51 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
53 private enum LinkType {
61 /** Link is an SSK. */
75 /** The template factory. */
76 private final TemplateContextFactory templateContextFactory;
79 * Creates a new freenet link parser.
81 * @param templateContextFactory
82 * The template context factory
84 public FreenetLinkParser(TemplateContextFactory templateContextFactory) {
85 this.templateContextFactory = templateContextFactory;
96 public Part parse(FreenetLinkParserContext context, Reader source) throws IOException {
97 PartContainer parts = new PartContainer();
98 BufferedReader bufferedReader = (source instanceof BufferedReader) ? (BufferedReader) source : new BufferedReader(source);
100 boolean lastLineEmpty = true;
102 while ((line = bufferedReader.readLine()) != null) {
103 if (line.trim().length() == 0) {
107 parts.add(createPlainTextPart("\n"));
109 lastLineEmpty = emptyLines == 2;
113 boolean lineComplete = true;
114 while (line.length() > 0) {
115 int nextKsk = line.indexOf("KSK@");
116 int nextChk = line.indexOf("CHK@");
117 int nextSsk = line.indexOf("SSK@");
118 int nextUsk = line.indexOf("USK@");
119 int nextHttp = line.indexOf("http://");
120 int nextHttps = line.indexOf("https://");
121 if ((nextKsk == -1) && (nextChk == -1) && (nextSsk == -1) && (nextUsk == -1) && (nextHttp == -1) && (nextHttps == -1)) {
122 if (lineComplete && !lastLineEmpty) {
123 parts.add(createPlainTextPart("\n" + line));
125 parts.add(createPlainTextPart(line));
129 int next = Integer.MAX_VALUE;
130 LinkType linkType = null;
131 if ((nextKsk > -1) && (nextKsk < next)) {
133 linkType = LinkType.KSK;
135 if ((nextChk > -1) && (nextChk < next)) {
137 linkType = LinkType.CHK;
139 if ((nextSsk > -1) && (nextSsk < next)) {
141 linkType = LinkType.SSK;
143 if ((nextUsk > -1) && (nextUsk < next)) {
145 linkType = LinkType.USK;
147 if ((nextHttp > -1) && (nextHttp < next)) {
149 linkType = LinkType.HTTP;
151 if ((nextHttps > -1) && (nextHttps < next)) {
153 linkType = LinkType.HTTPS;
155 if ((next >= 8) && (line.substring(next - 8, next).equals("freenet:"))) {
157 line = line.substring(0, next) + line.substring(next + 8);
159 Matcher matcher = whitespacePattern.matcher(line);
160 int nextSpace = matcher.find(next) ? matcher.start() : line.length();
161 if (nextSpace > (next + 4)) {
162 if (!lastLineEmpty && lineComplete) {
163 parts.add(createPlainTextPart("\n" + line.substring(0, next)));
165 parts.add(createPlainTextPart(line.substring(0, next)));
167 String link = line.substring(next, nextSpace);
169 logger.log(Level.FINER, "Found link: %s", link);
170 logger.log(Level.FINEST, "Next: %d, CHK: %d, SSK: %d, USK: %d", new Object[] { next, nextChk, nextSsk, nextUsk });
172 if ((linkType == LinkType.KSK) || (linkType == LinkType.CHK) || (linkType == LinkType.SSK) || (linkType == LinkType.USK)) {
174 if (name.indexOf('?') > -1) {
175 name = name.substring(0, name.indexOf('?'));
177 if (name.endsWith("/")) {
178 name = name.substring(0, name.length() - 1);
181 uri = new FreenetURI(name);
182 name = uri.lastMetaString();
184 name = uri.getDocName();
187 name = link.substring(0, Math.min(9, link.length()));
189 boolean fromPostingSone = ((linkType == LinkType.SSK) || (linkType == LinkType.USK)) && link.substring(4, Math.min(link.length(), 47)).equals(context.getPostingSone().getId());
190 parts.add(fromPostingSone ? createTrustedFreenetLinkPart(link, name) : createFreenetLinkPart(link, name));
191 } catch (MalformedURLException mue1) {
192 /* not a valid link, insert as plain text. */
193 parts.add(createPlainTextPart(link));
194 } catch (NullPointerException npe1) {
195 /* FreenetURI sometimes throws these, too. */
196 parts.add(createPlainTextPart(link));
197 } catch (ArrayIndexOutOfBoundsException aioobe1) {
198 /* oh, and these, too. */
199 parts.add(createPlainTextPart(link));
201 } else if ((linkType == LinkType.HTTP) || (linkType == LinkType.HTTPS)) {
202 name = link.substring(linkType == LinkType.HTTP ? 7 : 8);
203 int firstSlash = name.indexOf('/');
204 int lastSlash = name.lastIndexOf('/');
205 if ((lastSlash - firstSlash) > 3) {
206 name = name.substring(0, firstSlash + 1) + "…" + name.substring(lastSlash);
208 if (name.endsWith("/")) {
209 name = name.substring(0, name.length() - 1);
211 if (((name.indexOf('/') > -1) && (name.indexOf('.') < name.lastIndexOf('.', name.indexOf('/'))) || ((name.indexOf('/') == -1) && (name.indexOf('.') < name.lastIndexOf('.')))) && name.startsWith("www.")) {
212 name = name.substring(4);
214 if (name.indexOf('?') > -1) {
215 name = name.substring(0, name.indexOf('?'));
217 link = "?_CHECKED_HTTP_=" + link;
218 parts.add(createInternetLinkPart(link, name));
220 line = line.substring(nextSpace);
222 if (!lastLineEmpty && lineComplete) {
223 parts.add(createPlainTextPart("\n" + line.substring(0, next + 4)));
225 parts.add(createPlainTextPart(line.substring(0, next + 4)));
227 line = line.substring(next + 4);
229 lineComplete = false;
231 lastLineEmpty = false;
233 for (int partIndex = parts.size() - 1; partIndex >= 0; --partIndex) {
234 if (!parts.getPart(partIndex).toString().equals("\n")) {
237 parts.removePart(partIndex);
247 * Creates a new plain text part based on a template.
250 * The text to display
251 * @return The part that displays the given text
253 private Part createPlainTextPart(String text) {
254 return new TemplatePart(templateContextFactory, TemplateParser.parse(new StringReader("<% text|html>"))).set("text", text);
258 * Creates a new part based on a template that links to a site within the
262 * The target of the link
264 * The name of the link
265 * @return The part that displays the link
267 private Part createInternetLinkPart(String link, String name) {
268 return new TemplatePart(templateContextFactory, TemplateParser.parse(new StringReader("<a class=\"internet\" href=\"/<% link|html>\" title=\"<% link|html>\"><% name|html></a>"))).set("link", link).set("name", name);
272 * Creates a new part based on a template that links to a site within
276 * The target of the link
278 * The name of the link
279 * @return The part that displays the link
281 private Part createFreenetLinkPart(String link, String name) {
282 return new TemplatePart(templateContextFactory, TemplateParser.parse(new StringReader("<a class=\"freenet\" href=\"/<% link|html>\" title=\"<% link|html>\"><% name|html></a>"))).set("link", link).set("name", name);
286 * Creates a new part based on a template that links to a page in the
290 * The target of the link
292 * The name of the link
293 * @return The part that displays the link
295 private Part createTrustedFreenetLinkPart(String link, String name) {
296 return new TemplatePart(templateContextFactory, TemplateParser.parse(new StringReader("<a class=\"freenet-trusted\" href=\"/<% link|html>\" title=\"<% link|html>\"><% name|html></a>"))).set("link", link).set("name", name);