1/*
2 * Copyright (c) 2018, Daniel Gultsch All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without modification,
5 * are permitted provided that the following conditions are met:
6 *
7 * 1. Redistributions of source code must retain the above copyright notice, this
8 * list of conditions and the following disclaimer.
9 *
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation and/or
12 * other materials provided with the distribution.
13 *
14 * 3. Neither the name of the copyright holder nor the names of its contributors
15 * may be used to endorse or promote products derived from this software without
16 * specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
22 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
25 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30package eu.siacs.conversations.ui.util;
31
32import android.net.Uri;
33import android.os.Build;
34import android.text.Editable;
35import android.text.Spanned;
36import android.text.style.TypefaceSpan;
37import android.text.style.URLSpan;
38import android.text.util.Linkify;
39
40import com.google.common.collect.Collections2;
41import com.google.common.collect.ImmutableList;
42import com.google.common.collect.Lists;
43
44import java.lang.IndexOutOfBoundsException;
45import java.util.Arrays;
46import java.util.Collection;
47import java.util.List;
48import java.util.Locale;
49import java.util.Objects;
50
51import eu.siacs.conversations.entities.Account;
52import eu.siacs.conversations.entities.ListItem;
53import eu.siacs.conversations.entities.Roster;
54import eu.siacs.conversations.ui.text.FixedURLSpan;
55import eu.siacs.conversations.utils.GeoHelper;
56import eu.siacs.conversations.utils.Patterns;
57import eu.siacs.conversations.utils.StylingHelper;
58import eu.siacs.conversations.utils.XmppUri;
59import eu.siacs.conversations.xmpp.Jid;
60
61public class MyLinkify {
62
63 private static final Linkify.TransformFilter WEBURL_TRANSFORM_FILTER = (matcher, url) -> {
64 if (url == null) {
65 return null;
66 }
67 final String lcUrl = url.toLowerCase(Locale.US);
68 if (lcUrl.startsWith("http://") || lcUrl.startsWith("https://")) {
69 return removeTrailingBracket(url);
70 } else {
71 return "http://" + removeTrailingBracket(url);
72 }
73 };
74
75 private static String removeTrailingBracket(final String url) {
76 int numOpenBrackets = 0;
77 for (char c : url.toCharArray()) {
78 if (c == '(') {
79 ++numOpenBrackets;
80 } else if (c == ')') {
81 --numOpenBrackets;
82 }
83 }
84 if (numOpenBrackets != 0 && url.charAt(url.length() - 1) == ')') {
85 return url.substring(0, url.length() - 1);
86 } else {
87 return url;
88 }
89 }
90
91 private static final Linkify.MatchFilter WEBURL_MATCH_FILTER = (cs, start, end) -> {
92 if (start > 0) {
93 if (cs.charAt(start - 1) == '@' || cs.charAt(start - 1) == '.'
94 || cs.subSequence(Math.max(0, start - 3), start).equals("://")) {
95 return false;
96 }
97 }
98
99 if (end < cs.length()) {
100 // Reject strings that were probably matched only because they contain a dot followed by
101 // by some known TLD (see also comment for WORD_BOUNDARY in Patterns.java)
102 return !isAlphabetic(cs.charAt(end - 1)) || !isAlphabetic(cs.charAt(end));
103 }
104
105 return true;
106 };
107
108 private static final Linkify.MatchFilter XMPPURI_MATCH_FILTER = (s, start, end) -> {
109 XmppUri uri = new XmppUri(s.subSequence(start, end).toString());
110 return uri.isValidJid();
111 };
112
113 private static boolean isAlphabetic(final int code) {
114 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
115 return Character.isAlphabetic(code);
116 }
117
118 switch (Character.getType(code)) {
119 case Character.UPPERCASE_LETTER:
120 case Character.LOWERCASE_LETTER:
121 case Character.TITLECASE_LETTER:
122 case Character.MODIFIER_LETTER:
123 case Character.OTHER_LETTER:
124 case Character.LETTER_NUMBER:
125 return true;
126 default:
127 return false;
128 }
129 }
130
131 public static void addLinks(Editable body, boolean includeGeo) {
132 Linkify.addLinks(body, Patterns.XMPP_PATTERN, "xmpp", XMPPURI_MATCH_FILTER, null);
133 Linkify.addLinks(body, Patterns.TEL_URI, "tel");
134 Linkify.addLinks(body, Patterns.SMS_URI, "sms");
135 Linkify.addLinks(body, Patterns.BITCOIN_URI, "bitcoin");
136 Linkify.addLinks(body, Patterns.BITCOINCASH_URI, "bitcoincash");
137 Linkify.addLinks(body, Patterns.ETHEREUM_URI, "ethereum");
138 Linkify.addLinks(body, Patterns.MONERO_URI, "monero");
139 Linkify.addLinks(body, Patterns.WOWNERO_URI, "wownero");
140 Linkify.addLinks(body, Patterns.AUTOLINK_WEB_URL, "http", WEBURL_MATCH_FILTER, WEBURL_TRANSFORM_FILTER);
141 if (includeGeo) {
142 Linkify.addLinks(body, GeoHelper.GEO_URI, "geo");
143 }
144 FixedURLSpan.fix(body);
145 }
146
147 public static void addLinks(Editable body, Account account, Jid context) {
148 addLinks(body, true);
149 Roster roster = account.getRoster();
150 urlspan:
151 for (final URLSpan urlspan : body.getSpans(0, body.length() - 1, URLSpan.class)) {
152 final var start = body.getSpanStart(urlspan);
153 for (final var span : body.getSpans(start, start, Object.class)) {
154 // instanceof TypefaceSpan is to block in XHTML code blocks. Probably a bit heavy-handed but works for now
155 if ((body.getSpanFlags(span) & Spanned.SPAN_USER) >> Spanned.SPAN_USER_SHIFT == StylingHelper.NOLINKIFY || span instanceof TypefaceSpan) {
156 body.removeSpan(urlspan);
157 continue urlspan;
158 }
159 }
160 Uri uri = Uri.parse(urlspan.getURL());
161 if ("xmpp".equals(uri.getScheme())) {
162 try {
163 if (!body.subSequence(body.getSpanStart(urlspan), body.getSpanEnd(urlspan)).toString().startsWith("xmpp:")) {
164 // Already customized
165 continue;
166 }
167
168 XmppUri xmppUri = new XmppUri(uri);
169 Jid jid = xmppUri.getJid();
170 String display = xmppUri.toString();
171 if (jid.asBareJid().equals(context) && xmppUri.isAction("message") && xmppUri.getBody() != null) {
172 display = xmppUri.getBody();
173 } else if (jid.asBareJid().equals(context) && xmppUri.parameterString().length() > 0) {
174 display = xmppUri.parameterString();
175 } else {
176 ListItem item = account.getBookmark(jid);
177 if (item == null) item = roster.getContact(jid);
178 display = item.getDisplayName() + xmppUri.displayParameterString();
179 }
180 body.replace(
181 body.getSpanStart(urlspan),
182 body.getSpanEnd(urlspan),
183 display
184 );
185 } catch (final IllegalArgumentException | IndexOutOfBoundsException e) { /* bad JID or span gone */ }
186 }
187 }
188 }
189
190 public static List<String> extractLinks(final Editable body) {
191 MyLinkify.addLinks(body, false);
192 final Collection<URLSpan> spans =
193 Arrays.asList(body.getSpans(0, body.length() - 1, URLSpan.class));
194 final Collection<UrlWrapper> urlWrappers =
195 Collections2.filter(
196 Collections2.transform(
197 spans,
198 s ->
199 s == null
200 ? null
201 : new UrlWrapper(body.getSpanStart(s), s.getURL())),
202 uw -> uw != null);
203 List<UrlWrapper> sorted = ImmutableList.sortedCopyOf(
204 (a, b) -> Integer.compare(a.position, b.position), urlWrappers);
205 return Lists.transform(sorted, uw -> uw.url);
206
207 }
208
209 private static class UrlWrapper {
210 private final int position;
211 private final String url;
212
213 private UrlWrapper(int position, String url) {
214 this.position = position;
215 this.url = url;
216 }
217 }
218}