2 * Sone - FreenetLinkParser.java - Copyright © 2010–2012 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.net.MalformedURLException;
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.core.PostProvider;
30 import net.pterodactylus.sone.core.SoneProvider;
31 import net.pterodactylus.sone.data.Post;
32 import net.pterodactylus.sone.data.Sone;
33 import net.pterodactylus.sone.database.memory.MemorySone;
34 import net.pterodactylus.util.io.Closer;
35 import net.pterodactylus.util.logging.Logging;
36 import freenet.keys.FreenetURI;
39 * {@link Parser} implementation that can recognize Freenet URIs.
41 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
43 public class SoneTextParser implements Parser<SoneTextParserContext> {
46 private static final Logger logger = Logging.getLogger(SoneTextParser.class);
48 /** Pattern to detect whitespace. */
49 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]");
52 * Enumeration for all recognized link types.
54 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
56 private enum LinkType {
64 /** Link is an SSK. */
76 /** Link is a Sone. */
79 /** Link is a post. */
82 /** The scheme identifying this link type. */
83 private final String scheme;
86 * Creates a new link type identified by the given scheme.
89 * The scheme of the link type
91 private LinkType(String scheme) {
96 * Returns the scheme of this link type.
98 * @return The scheme of this link type
100 public String getScheme() {
106 /** The Sone provider. */
107 private final SoneProvider soneProvider;
109 /** The post provider. */
110 private final PostProvider postProvider;
113 * Creates a new freenet link parser.
115 * @param soneProvider
117 * @param postProvider
120 public SoneTextParser(SoneProvider soneProvider, PostProvider postProvider) {
121 this.soneProvider = soneProvider;
122 this.postProvider = postProvider;
133 public Iterable<Part> parse(SoneTextParserContext context, Reader source) throws IOException {
134 PartContainer parts = new PartContainer();
135 BufferedReader bufferedReader = (source instanceof BufferedReader) ? (BufferedReader) source : new BufferedReader(source);
138 boolean lastLineEmpty = true;
140 while ((line = bufferedReader.readLine()) != null) {
141 if (line.trim().length() == 0) {
145 parts.add(new PlainTextPart("\n"));
147 lastLineEmpty = emptyLines == 2;
152 * lineComplete tracks whether the block you are parsing is the
153 * first block of the line. this is important because sometimes
154 * you have to add an additional line break.
156 boolean lineComplete = true;
157 while (line.length() > 0) {
158 int nextKsk = line.indexOf("KSK@");
159 int nextChk = line.indexOf("CHK@");
160 int nextSsk = line.indexOf("SSK@");
161 int nextUsk = line.indexOf("USK@");
162 int nextHttp = line.indexOf("http://");
163 int nextHttps = line.indexOf("https://");
164 int nextSone = line.indexOf("sone://");
165 int nextPost = line.indexOf("post://");
166 if ((nextKsk == -1) && (nextChk == -1) && (nextSsk == -1) && (nextUsk == -1) && (nextHttp == -1) && (nextHttps == -1) && (nextSone == -1) && (nextPost == -1)) {
167 if (lineComplete && !lastLineEmpty) {
168 parts.add(new PlainTextPart("\n" + line));
170 parts.add(new PlainTextPart(line));
174 int next = Integer.MAX_VALUE;
175 LinkType linkType = null;
176 if ((nextKsk > -1) && (nextKsk < next)) {
178 linkType = LinkType.KSK;
180 if ((nextChk > -1) && (nextChk < next)) {
182 linkType = LinkType.CHK;
184 if ((nextSsk > -1) && (nextSsk < next)) {
186 linkType = LinkType.SSK;
188 if ((nextUsk > -1) && (nextUsk < next)) {
190 linkType = LinkType.USK;
192 if ((nextHttp > -1) && (nextHttp < next)) {
194 linkType = LinkType.HTTP;
196 if ((nextHttps > -1) && (nextHttps < next)) {
198 linkType = LinkType.HTTPS;
200 if ((nextSone > -1) && (nextSone < next)) {
202 linkType = LinkType.SONE;
204 if ((nextPost > -1) && (nextPost < next)) {
206 linkType = LinkType.POST;
209 /* cut off “freenet:” from before keys. */
210 if (((linkType == LinkType.KSK) || (linkType == LinkType.CHK) || (linkType == LinkType.SSK) || (linkType == LinkType.USK)) && (next >= 8) && (line.substring(next - 8, next).equals("freenet:"))) {
212 line = line.substring(0, next) + line.substring(next + 8);
215 /* if there is text before the next item, write it out. */
216 if (lineComplete && !lastLineEmpty) {
217 parts.add(new PlainTextPart("\n"));
220 parts.add(new PlainTextPart(line.substring(0, next)));
221 line = line.substring(next);
224 lineComplete = false;
226 Matcher matcher = whitespacePattern.matcher(line);
227 int nextSpace = matcher.find(0) ? matcher.start() : line.length();
228 String link = line.substring(0, nextSpace);
230 logger.log(Level.FINER, String.format("Found link: %s", link));
231 logger.log(Level.FINEST, String.format("CHK: %d, SSK: %d, USK: %d", nextChk, nextSsk, nextUsk));
233 /* if there is no text after the scheme, it’s not a link! */
234 if (link.equals(linkType.getScheme())) {
235 parts.add(new PlainTextPart(linkType.getScheme()));
236 line = line.substring(linkType.getScheme().length());
240 if (linkType == LinkType.SONE) {
241 if (line.length() >= (7 + 43)) {
242 String soneId = line.substring(7, 50);
243 Sone sone = soneProvider.getSone(soneId, false);
246 * don’t use create=true above, we don’t want
249 sone = new MemorySone(soneId, false);
251 parts.add(new SonePart(sone));
252 line = line.substring(50);
254 parts.add(new PlainTextPart(line));
259 if (linkType == LinkType.POST) {
260 if (line.length() >= (7 + 36)) {
261 String postId = line.substring(7, 43);
262 Post post = postProvider.getPost(postId, false);
263 if ((post != null) && (post.getSone() != null)) {
264 parts.add(new PostPart(post));
266 parts.add(new PlainTextPart(line.substring(0, 43)));
268 line = line.substring(43);
270 parts.add(new PlainTextPart(line));
276 if ((linkType == LinkType.KSK) || (linkType == LinkType.CHK) || (linkType == LinkType.SSK) || (linkType == LinkType.USK)) {
278 if (name.indexOf('?') > -1) {
279 name = name.substring(0, name.indexOf('?'));
281 if (name.endsWith("/")) {
282 name = name.substring(0, name.length() - 1);
285 uri = new FreenetURI(name);
286 name = uri.lastMetaString();
288 name = uri.getDocName();
291 name = link.substring(0, Math.min(9, link.length()));
293 boolean fromPostingSone = ((linkType == LinkType.SSK) || (linkType == LinkType.USK)) && (context != null) && (context.getPostingSone() != null) && link.substring(4, Math.min(link.length(), 47)).equals(context.getPostingSone().getId());
294 parts.add(new FreenetLinkPart(link, name, fromPostingSone));
295 } catch (MalformedURLException mue1) {
296 /* not a valid link, insert as plain text. */
297 parts.add(new PlainTextPart(link));
298 } catch (NullPointerException npe1) {
299 /* FreenetURI sometimes throws these, too. */
300 parts.add(new PlainTextPart(link));
301 } catch (ArrayIndexOutOfBoundsException aioobe1) {
302 /* oh, and these, too. */
303 parts.add(new PlainTextPart(link));
305 } else if ((linkType == LinkType.HTTP) || (linkType == LinkType.HTTPS)) {
306 name = link.substring(linkType == LinkType.HTTP ? 7 : 8);
307 int firstSlash = name.indexOf('/');
308 int lastSlash = name.lastIndexOf('/');
309 if ((lastSlash - firstSlash) > 3) {
310 name = name.substring(0, firstSlash + 1) + "…" + name.substring(lastSlash);
312 if (name.endsWith("/")) {
313 name = name.substring(0, name.length() - 1);
315 if (((name.indexOf('/') > -1) && (name.indexOf('.') < name.lastIndexOf('.', name.indexOf('/'))) || ((name.indexOf('/') == -1) && (name.indexOf('.') < name.lastIndexOf('.')))) && name.startsWith("www.")) {
316 name = name.substring(4);
318 if (name.indexOf('?') > -1) {
319 name = name.substring(0, name.indexOf('?'));
321 parts.add(new LinkPart(link, name));
323 line = line.substring(nextSpace);
325 lastLineEmpty = false;
328 if (bufferedReader != source) {
329 Closer.close(bufferedReader);
332 for (int partIndex = parts.size() - 1; partIndex >= 0; --partIndex) {
333 Part part = parts.getPart(partIndex);
334 if (!(part instanceof PlainTextPart) || !"\n".equals(((PlainTextPart) part).getText())) {
337 parts.removePart(partIndex);