+++ /dev/null
-/*
- * Sone - SoneTextParser.java - Copyright © 2010–2016 David Roden
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-package net.pterodactylus.sone.text;
-
-import static com.google.common.base.Optional.absent;
-import static com.google.common.base.Optional.of;
-import static java.util.logging.Logger.getLogger;
-
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.Reader;
-import java.io.StringReader;
-import java.net.MalformedURLException;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.logging.Level;
-import java.util.logging.Logger;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
-
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
-
-import net.pterodactylus.sone.data.Post;
-import net.pterodactylus.sone.data.Sone;
-import net.pterodactylus.sone.data.impl.IdOnlySone;
-import net.pterodactylus.sone.database.PostProvider;
-import net.pterodactylus.sone.database.SoneProvider;
-
-import com.google.common.base.Optional;
-import org.bitpedia.util.Base32;
-
-import freenet.keys.FreenetURI;
-import freenet.support.Base64;
-
-/**
- * {@link Parser} implementation that can recognize Freenet URIs.
- *
- * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
- */
-public class SoneTextParser implements Parser<SoneTextParserContext> {
-
- /** The logger. */
- private static final Logger logger = getLogger(SoneTextParser.class.getName());
-
- /** Pattern to detect whitespace. */
- 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]");
-
- private static class NextLink {
-
- private final int position;
- private final String link;
- private final String remainder;
- private final LinkType linkType;
-
- private NextLink(int position, String link, String remainder, LinkType linkType) {
- this.position = position;
- this.link = link;
- this.remainder = remainder;
- this.linkType = linkType;
- }
-
- public int getPosition() {
- return position;
- }
-
- public String getLink() {
- return link;
- }
-
- public String getRemainder() {
- return remainder;
- }
-
- public LinkType getLinkType() {
- return linkType;
- }
-
- }
-
- /**
- * Enumeration for all recognized link types.
- *
- * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
- */
- private enum LinkType {
-
- KSK("KSK@", true),
- CHK("CHK@", true),
- SSK("SSK@", true),
- USK("USK@", true),
- HTTP("http://", false),
- HTTPS("https://", false),
- SONE("sone://", false),
- POST("post://", false),
-
- FREEMAIL("", true) {
- @Override
- public Optional<NextLink> findNext(String line) {
- int nextFreemailSuffix = line.indexOf(".freemail");
- if (nextFreemailSuffix < 54) {
- /* 52 chars for the id, 1 on @, at least 1 for the local part. */
- return absent();
- }
- if (line.charAt(nextFreemailSuffix - 53) != '@') {
- return absent();
- }
- if (!line.substring(nextFreemailSuffix - 52, nextFreemailSuffix).matches("^[a-z2-7]*$")) {
- return absent();
- }
- int startOfLocalPart = nextFreemailSuffix - 54;
- if (!isAllowedInLocalPart(line.charAt(startOfLocalPart))) {
- return absent();
- }
- while ((startOfLocalPart > 0) && isAllowedInLocalPart(line.charAt(startOfLocalPart - 1))) {
- startOfLocalPart--;
- }
- return of(new NextLink(startOfLocalPart, line.substring(startOfLocalPart, nextFreemailSuffix + 9), line.substring(nextFreemailSuffix + 9), this));
- }
-
- private boolean isAllowedInLocalPart(char character) {
- return ((character >= 'A') && (character <= 'Z'))
- || ((character >= 'a') && (character <= 'z'))
- || ((character >= '0') && (character <= '9'))
- || (character == '.') || (character == '-') || (character == '_');
- }
- };
-
- private final String scheme;
- private final boolean freenetLink;
-
- LinkType(String scheme, boolean freenetLink) {
- this.scheme = scheme;
- this.freenetLink = freenetLink;
- }
-
- /**
- * Returns the scheme of this link type.
- *
- * @return The scheme of this link type
- */
- public String getScheme() {
- return scheme;
- }
-
- public boolean isFreenetLink() {
- return freenetLink;
- }
-
- public Optional<NextLink> findNext(String line) {
- int nextLinkPosition = line.indexOf(getScheme());
- if (nextLinkPosition == -1) {
- return absent();
- }
- int endOfLink = findEndOfLink(line.substring(nextLinkPosition));
- return of(new NextLink(nextLinkPosition, line.substring(nextLinkPosition, nextLinkPosition + endOfLink), line.substring(nextLinkPosition + endOfLink), this));
- }
-
- private static int findEndOfLink(String line) {
- Matcher matcher = whitespacePattern.matcher(line);
- int endOfLink = matcher.find() ? matcher.start() : line.length();
- while (isPunctuation(line.charAt(endOfLink - 1))) {
- endOfLink--;
- }
- int openParens = 0;
- for (int i = 0; i < endOfLink; i++) {
- switch (line.charAt(i)) {
- case '(':
- openParens++;
- break;
- case ')':
- openParens--;
- if (openParens < 0) {
- return i;
- }
- default:
- }
- }
- return endOfLink;
- }
-
- }
-
- /** The Sone provider. */
- private final SoneProvider soneProvider;
-
- /** The post provider. */
- private final PostProvider postProvider;
-
- /**
- * Creates a new freenet link parser.
- *
- * @param soneProvider
- * The Sone provider
- * @param postProvider
- * The post provider
- */
- public SoneTextParser(SoneProvider soneProvider, PostProvider postProvider) {
- this.soneProvider = soneProvider;
- this.postProvider = postProvider;
- }
-
- //
- // PART METHODS
- //
-
- /**
- * {@inheritDoc}
- */
- @Nonnull
- @Override
- public Iterable<Part> parse(@Nonnull String source, @Nullable SoneTextParserContext context) {
- List<Part> parts = new ArrayList<>();
- try (Reader sourceReader = new StringReader(source);
- BufferedReader bufferedReader = new BufferedReader(sourceReader)) {
- String line;
- boolean lastLineEmpty = true;
- int emptyLines = 0;
- while ((line = bufferedReader.readLine()) != null) {
- if (line.trim().length() == 0) {
- if (lastLineEmpty) {
- continue;
- }
- parts.add(new PlainTextPart("\n"));
- ++emptyLines;
- lastLineEmpty = emptyLines == 2;
- continue;
- }
- emptyLines = 0;
- /*
- * lineComplete tracks whether the block you are parsing is the
- * first block of the line. this is important because sometimes
- * you have to add an additional line break.
- */
- boolean lineComplete = true;
- while (line.length() > 0) {
- Optional<NextLink> nextLink = findNextLink(line);
- if (!nextLink.isPresent()) {
- if (lineComplete && !lastLineEmpty) {
- parts.add(new PlainTextPart("\n" + line));
- } else {
- parts.add(new PlainTextPart(line));
- }
- break;
- }
- LinkType linkType = nextLink.get().getLinkType();
- int next = nextLink.get().getPosition();
-
- /* cut off “freenet:” from before keys. */
- if (linkType.isFreenetLink() && (next >= 8) && (line.substring(next - 8, next).equals("freenet:"))) {
- next -= 8;
- line = line.substring(0, next) + line.substring(next + 8);
- }
-
- /* if there is text before the next item, write it out. */
- if (lineComplete && !lastLineEmpty) {
- parts.add(new PlainTextPart("\n"));
- }
- if (next > 0) {
- parts.add(new PlainTextPart(line.substring(0, next)));
- line = line.substring(next);
- }
- lineComplete = false;
-
- String link = nextLink.get().getLink();
- logger.log(Level.FINER, String.format("Found link: %s", link));
-
- /* if there is no text after the scheme, it’s not a link! */
- if (link.equals(linkType.getScheme())) {
- parts.add(new PlainTextPart(linkType.getScheme()));
- line = line.substring(linkType.getScheme().length());
- continue;
- }
-
- switch (linkType) {
- case SONE:
- renderSoneLink(parts, link);
- break;
- case POST:
- renderPostLink(parts, link);
- break;
- case KSK:
- case CHK:
- case SSK:
- case USK:
- renderFreenetLink(parts, link, linkType, context);
- break;
- case HTTP:
- case HTTPS:
- renderHttpLink(parts, link, linkType);
- break;
- case FREEMAIL:
- renderFreemailLink(parts, link);
- }
-
- line = nextLink.get().getRemainder();
- }
- lastLineEmpty = false;
- }
- } catch (IOException ioe1) {
- // a buffered reader around a string reader should never throw.
- throw new RuntimeException(ioe1);
- }
- for (int partIndex = parts.size() - 1; partIndex >= 0; --partIndex) {
- Part part = parts.get(partIndex);
- if (!(part instanceof PlainTextPart) || !"\n".equals(part.getText())) {
- break;
- }
- parts.remove(partIndex);
- }
- return parts;
- }
-
- public static Optional<NextLink> findNextLink(String line) {
- int earliestLinkPosition = Integer.MAX_VALUE;
- NextLink earliestNextLink = null;
- for (LinkType possibleLinkType : LinkType.values()) {
- Optional<NextLink> nextLink = possibleLinkType.findNext(line);
- if (nextLink.isPresent()) {
- if (nextLink.get().getPosition() < earliestLinkPosition) {
- earliestNextLink = nextLink.get();
- earliestLinkPosition = earliestNextLink.getPosition();
- }
- }
- }
- return Optional.fromNullable(earliestNextLink);
- }
-
- private void renderSoneLink(List<Part> parts, String line) {
- if (line.length() >= (7 + 43)) {
- String soneId = line.substring(7, 50);
- Optional<Sone> sone = soneProvider.getSone(soneId);
- parts.add(new SonePart(sone.or(new IdOnlySone(soneId))));
- } else {
- parts.add(new PlainTextPart(line));
- }
- }
-
- private void renderPostLink(List<Part> parts, String line) {
- if (line.length() >= (7 + 36)) {
- String postId = line.substring(7, 43);
- Optional<Post> post = postProvider.getPost(postId);
- if (post.isPresent()) {
- parts.add(new PostPart(post.get()));
- } else {
- parts.add(new PlainTextPart(line.substring(0, 43)));
- }
- } else {
- parts.add(new PlainTextPart(line));
- }
- }
-
- private void renderFreenetLink(List<Part> parts, String link, LinkType linkType, @Nullable SoneTextParserContext context) {
- String name = link;
- String linkWithoutParameters = link;
- if (name.indexOf('?') > -1) {
- linkWithoutParameters = name = name.substring(0, name.indexOf('?'));
- }
- if (name.endsWith("/")) {
- name = name.substring(0, name.length() - 1);
- }
- try {
- FreenetURI uri = new FreenetURI(name);
- name = uri.lastMetaString();
- if (name == null) {
- name = uri.getDocName();
- }
- if (name == null) {
- name = link.substring(0, Math.min(9, link.length()));
- }
- 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());
- parts.add(new FreenetLinkPart(link, name, linkWithoutParameters, fromPostingSone));
- } catch (MalformedURLException mue1) {
- /* not a valid link, insert as plain text. */
- parts.add(new PlainTextPart(link));
- } catch (NullPointerException npe1) {
- /* FreenetURI sometimes throws these, too. */
- parts.add(new PlainTextPart(link));
- } catch (ArrayIndexOutOfBoundsException aioobe1) {
- /* oh, and these, too. */
- parts.add(new PlainTextPart(link));
- }
- }
-
- private void renderHttpLink(List<Part> parts, String link, LinkType linkType) {
- String name = link.substring(linkType == LinkType.HTTP ? 7 : 8);
- int firstSlash = name.indexOf('/');
- int lastSlash = name.lastIndexOf('/');
- if ((lastSlash - firstSlash) > 3) {
- name = name.substring(0, firstSlash + 1) + "…" + name.substring(lastSlash);
- }
- if (name.endsWith("/")) {
- name = name.substring(0, name.length() - 1);
- }
- if (((name.indexOf('/') > -1) && (name.indexOf('.') < name.lastIndexOf('.', name.indexOf('/'))) || ((name.indexOf('/') == -1) && (name.indexOf('.') < name.lastIndexOf('.')))) && name.startsWith("www.")) {
- name = name.substring(4);
- }
- if (name.indexOf('?') > -1) {
- name = name.substring(0, name.indexOf('?'));
- }
- parts.add(new LinkPart(link, name));
- }
-
- private void renderFreemailLink(List<Part> parts, String line) {
- int separator = line.indexOf('@');
- String freemailId = line.substring(separator + 1, separator + 53);
- String identityId = Base64.encode(Base32.decode(freemailId));
- String emailLocalPart = line.substring(0, separator);
- parts.add(new FreemailPart(emailLocalPart, freemailId, identityId));
- }
-
- private static boolean isPunctuation(char character) {
- return (character == '.') || (character == ',') || (character == '!') || (character == '?');
- }
-
-}