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.sone.core.Core;
31 import net.pterodactylus.sone.data.Post;
32 import net.pterodactylus.sone.data.Sone;
33 import net.pterodactylus.sone.template.SoneAccessor;
34 import net.pterodactylus.util.logging.Logging;
35 import net.pterodactylus.util.template.TemplateContextFactory;
36 import net.pterodactylus.util.template.TemplateParser;
37 import freenet.keys.FreenetURI;
40 * {@link Parser} implementation that can recognize Freenet URIs.
42 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
44 public class FreenetLinkParser implements Parser<FreenetLinkParserContext> {
47 private static final Logger logger = Logging.getLogger(FreenetLinkParser.class);
49 /** Pattern to detect whitespace. */
50 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]");
53 * Enumeration for all recognized link types.
55 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
57 private enum LinkType {
65 /** Link is an SSK. */
77 /** Link is a Sone. */
80 /** Link is a post. */
86 private final Core core;
88 /** The template factory. */
89 private final TemplateContextFactory templateContextFactory;
92 * Creates a new freenet link parser.
96 * @param templateContextFactory
97 * The template context factory
99 public FreenetLinkParser(Core core, TemplateContextFactory templateContextFactory) {
101 this.templateContextFactory = templateContextFactory;
112 public Part parse(FreenetLinkParserContext context, Reader source) throws IOException {
113 PartContainer parts = new PartContainer();
114 BufferedReader bufferedReader = (source instanceof BufferedReader) ? (BufferedReader) source : new BufferedReader(source);
116 boolean lastLineEmpty = true;
118 while ((line = bufferedReader.readLine()) != null) {
119 if (line.trim().length() == 0) {
123 parts.add(createPlainTextPart("\n"));
125 lastLineEmpty = emptyLines == 2;
129 boolean lineComplete = true;
130 while (line.length() > 0) {
131 int nextKsk = line.indexOf("KSK@");
132 int nextChk = line.indexOf("CHK@");
133 int nextSsk = line.indexOf("SSK@");
134 int nextUsk = line.indexOf("USK@");
135 int nextHttp = line.indexOf("http://");
136 int nextHttps = line.indexOf("https://");
137 int nextSone = line.indexOf("sone://");
138 int nextPost = line.indexOf("post://");
139 if ((nextKsk == -1) && (nextChk == -1) && (nextSsk == -1) && (nextUsk == -1) && (nextHttp == -1) && (nextHttps == -1) && (nextSone == -1) && (nextPost == -1)) {
140 if (lineComplete && !lastLineEmpty) {
141 parts.add(createPlainTextPart("\n" + line));
143 parts.add(createPlainTextPart(line));
147 int next = Integer.MAX_VALUE;
148 LinkType linkType = null;
149 if ((nextKsk > -1) && (nextKsk < next)) {
151 linkType = LinkType.KSK;
153 if ((nextChk > -1) && (nextChk < next)) {
155 linkType = LinkType.CHK;
157 if ((nextSsk > -1) && (nextSsk < next)) {
159 linkType = LinkType.SSK;
161 if ((nextUsk > -1) && (nextUsk < next)) {
163 linkType = LinkType.USK;
165 if ((nextHttp > -1) && (nextHttp < next)) {
167 linkType = LinkType.HTTP;
169 if ((nextHttps > -1) && (nextHttps < next)) {
171 linkType = LinkType.HTTPS;
173 if ((nextSone > -1) && (nextSone < next)) {
175 linkType = LinkType.SONE;
177 if ((nextPost > -1) && (nextPost < next)) {
179 linkType = LinkType.POST;
181 if ((next >= 8) && (line.substring(next - 8, next).equals("freenet:"))) {
183 line = line.substring(0, next) + line.substring(next + 8);
185 Matcher matcher = whitespacePattern.matcher(line);
186 int nextSpace = matcher.find(next) ? matcher.start() : line.length();
187 if (nextSpace > (next + 4)) {
188 if (!lastLineEmpty && lineComplete) {
189 parts.add(createPlainTextPart("\n" + line.substring(0, next)));
191 parts.add(createPlainTextPart(line.substring(0, next)));
193 String link = line.substring(next, nextSpace);
195 logger.log(Level.FINER, "Found link: %s", link);
196 logger.log(Level.FINEST, "Next: %d, CHK: %d, SSK: %d, USK: %d", new Object[] { next, nextChk, nextSsk, nextUsk });
198 if ((linkType == LinkType.KSK) || (linkType == LinkType.CHK) || (linkType == LinkType.SSK) || (linkType == LinkType.USK)) {
200 if (name.indexOf('?') > -1) {
201 name = name.substring(0, name.indexOf('?'));
203 if (name.endsWith("/")) {
204 name = name.substring(0, name.length() - 1);
207 uri = new FreenetURI(name);
208 name = uri.lastMetaString();
210 name = uri.getDocName();
213 name = link.substring(0, Math.min(9, link.length()));
215 boolean fromPostingSone = ((linkType == LinkType.SSK) || (linkType == LinkType.USK)) && link.substring(4, Math.min(link.length(), 47)).equals(context.getPostingSone().getId());
216 parts.add(fromPostingSone ? createTrustedFreenetLinkPart(link, name) : createFreenetLinkPart(link, name));
217 } catch (MalformedURLException mue1) {
218 /* not a valid link, insert as plain text. */
219 parts.add(createPlainTextPart(link));
220 } catch (NullPointerException npe1) {
221 /* FreenetURI sometimes throws these, too. */
222 parts.add(createPlainTextPart(link));
223 } catch (ArrayIndexOutOfBoundsException aioobe1) {
224 /* oh, and these, too. */
225 parts.add(createPlainTextPart(link));
227 } else if ((linkType == LinkType.HTTP) || (linkType == LinkType.HTTPS)) {
228 name = link.substring(linkType == LinkType.HTTP ? 7 : 8);
229 int firstSlash = name.indexOf('/');
230 int lastSlash = name.lastIndexOf('/');
231 if ((lastSlash - firstSlash) > 3) {
232 name = name.substring(0, firstSlash + 1) + "…" + name.substring(lastSlash);
234 if (name.endsWith("/")) {
235 name = name.substring(0, name.length() - 1);
237 if (((name.indexOf('/') > -1) && (name.indexOf('.') < name.lastIndexOf('.', name.indexOf('/'))) || ((name.indexOf('/') == -1) && (name.indexOf('.') < name.lastIndexOf('.')))) && name.startsWith("www.")) {
238 name = name.substring(4);
240 if (name.indexOf('?') > -1) {
241 name = name.substring(0, name.indexOf('?'));
243 link = "?_CHECKED_HTTP_=" + link;
244 parts.add(createInternetLinkPart(link, name));
245 } else if (linkType == LinkType.SONE) {
246 String soneId = link.substring(7);
247 Sone sone = core.getSone(soneId, false);
249 parts.add(createInSoneLinkPart("viewSone.html?sone=" + soneId, SoneAccessor.getNiceName(sone)));
251 parts.add(createPlainTextPart(link));
253 } else if (linkType == LinkType.POST) {
254 String postId = link.substring(7);
255 Post post = core.getPost(postId, false);
256 if ((post != null) && (post.getSone() != null)) {
257 String postText = post.getText();
258 postText = postText.substring(0, Math.min(postText.length(), 20)) + "…";
259 Sone postSone = post.getSone();
260 parts.add(createInSoneLinkPart("viewPost.html?post=" + postId, postText, (postSone == null) ? postText : SoneAccessor.getNiceName(post.getSone())));
262 parts.add(createPlainTextPart(link));
265 line = line.substring(nextSpace);
267 if (!lastLineEmpty && lineComplete) {
268 parts.add(createPlainTextPart("\n" + line.substring(0, next + 4)));
270 parts.add(createPlainTextPart(line.substring(0, next + 4)));
272 line = line.substring(next + 4);
274 lineComplete = false;
276 lastLineEmpty = false;
278 for (int partIndex = parts.size() - 1; partIndex >= 0; --partIndex) {
279 if (!parts.getPart(partIndex).toString().equals("\n")) {
282 parts.removePart(partIndex);
292 * Creates a new plain text part based on a template.
295 * The text to display
296 * @return The part that displays the given text
298 private Part createPlainTextPart(String text) {
299 return new TemplatePart(templateContextFactory, TemplateParser.parse(new StringReader("<% text|html>"))).set("text", text);
303 * Creates a new part based on a template that links to a site within the
307 * The target of the link
309 * The name of the link
310 * @return The part that displays the link
312 private Part createInternetLinkPart(String link, String name) {
313 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);
317 * Creates a new part based on a template that links to a site within
321 * The target of the link
323 * The name of the link
324 * @return The part that displays the link
326 private Part createFreenetLinkPart(String link, String name) {
327 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);
331 * Creates a new part based on a template that links to a page in the
335 * The target of the link
337 * The name of the link
338 * @return The part that displays the link
340 private Part createTrustedFreenetLinkPart(String link, String name) {
341 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);
345 * Creates a new part based on a template that links to a page in Sone.
348 * The target of the link
350 * The name of the link
351 * @return The part that displays the link
353 private Part createInSoneLinkPart(String link, String name) {
354 return createInSoneLinkPart(link, name, name);
358 * Creates a new part based on a template that links to a page in Sone.
361 * The target of the link
363 * The name of the link
365 * The title attribute of the link
366 * @return The part that displays the link
368 private Part createInSoneLinkPart(String link, String name, String title) {
369 return new TemplatePart(templateContextFactory, TemplateParser.parse(new StringReader("<a class=\"in-sone\" href=\"<%link|html>\" title=\"<%title|html>\"><%name|html></a>"))).set("link", link).set("name", name).set("title", title);