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.style.URLSpan;
36import android.text.util.Linkify;
37
38import com.google.common.collect.Collections2;
39import com.google.common.collect.ImmutableList;
40import com.google.common.collect.Lists;
41
42import java.lang.IndexOutOfBoundsException;
43import java.util.Arrays;
44import java.util.Collection;
45import java.util.List;
46import java.util.Locale;
47import java.util.Objects;
48
49import eu.siacs.conversations.entities.Account;
50import eu.siacs.conversations.entities.ListItem;
51import eu.siacs.conversations.entities.Roster;
52import eu.siacs.conversations.ui.text.FixedURLSpan;
53import eu.siacs.conversations.utils.GeoHelper;
54import eu.siacs.conversations.utils.Patterns;
55import eu.siacs.conversations.utils.XmppUri;
56import eu.siacs.conversations.xmpp.Jid;
57
58public class MyLinkify {
59
60 private static final Linkify.TransformFilter WEBURL_TRANSFORM_FILTER = (matcher, url) -> {
61 if (url == null) {
62 return null;
63 }
64 final String lcUrl = url.toLowerCase(Locale.US);
65 if (lcUrl.startsWith("http://") || lcUrl.startsWith("https://")) {
66 return removeTrailingBracket(url);
67 } else {
68 return "http://" + removeTrailingBracket(url);
69 }
70 };
71
72 private static String removeTrailingBracket(final String url) {
73 int numOpenBrackets = 0;
74 for (char c : url.toCharArray()) {
75 if (c == '(') {
76 ++numOpenBrackets;
77 } else if (c == ')') {
78 --numOpenBrackets;
79 }
80 }
81 if (numOpenBrackets != 0 && url.charAt(url.length() - 1) == ')') {
82 return url.substring(0, url.length() - 1);
83 } else {
84 return url;
85 }
86 }
87
88 private static final Linkify.MatchFilter WEBURL_MATCH_FILTER = (cs, start, end) -> {
89 if (start > 0) {
90 if (cs.charAt(start - 1) == '@' || cs.charAt(start - 1) == '.'
91 || cs.subSequence(Math.max(0, start - 3), start).equals("://")) {
92 return false;
93 }
94 }
95
96 if (end < cs.length()) {
97 // Reject strings that were probably matched only because they contain a dot followed by
98 // by some known TLD (see also comment for WORD_BOUNDARY in Patterns.java)
99 return !isAlphabetic(cs.charAt(end - 1)) || !isAlphabetic(cs.charAt(end));
100 }
101
102 return true;
103 };
104
105 private static final Linkify.MatchFilter XMPPURI_MATCH_FILTER = (s, start, end) -> {
106 XmppUri uri = new XmppUri(s.subSequence(start, end).toString());
107 return uri.isValidJid();
108 };
109
110 private static boolean isAlphabetic(final int code) {
111 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
112 return Character.isAlphabetic(code);
113 }
114
115 switch (Character.getType(code)) {
116 case Character.UPPERCASE_LETTER:
117 case Character.LOWERCASE_LETTER:
118 case Character.TITLECASE_LETTER:
119 case Character.MODIFIER_LETTER:
120 case Character.OTHER_LETTER:
121 case Character.LETTER_NUMBER:
122 return true;
123 default:
124 return false;
125 }
126 }
127
128 public static void addLinks(Editable body, boolean includeGeo) {
129 Linkify.addLinks(body, Patterns.XMPP_PATTERN, "xmpp", XMPPURI_MATCH_FILTER, null);
130 Linkify.addLinks(body, Patterns.AUTOLINK_WEB_URL, "http", WEBURL_MATCH_FILTER, WEBURL_TRANSFORM_FILTER);
131 if (includeGeo) {
132 Linkify.addLinks(body, GeoHelper.GEO_URI, "geo");
133 }
134 FixedURLSpan.fix(body);
135 }
136
137 public static void addLinks(Editable body, Account account, Jid context) {
138 addLinks(body, true);
139 Roster roster = account.getRoster();
140 for (final URLSpan urlspan : body.getSpans(0, body.length() - 1, URLSpan.class)) {
141 Uri uri = Uri.parse(urlspan.getURL());
142 if ("xmpp".equals(uri.getScheme())) {
143 try {
144 if (!body.subSequence(body.getSpanStart(urlspan), body.getSpanEnd(urlspan)).toString().startsWith("xmpp:")) {
145 // Already customized
146 continue;
147 }
148
149 XmppUri xmppUri = new XmppUri(uri);
150 Jid jid = xmppUri.getJid();
151 String display = xmppUri.toString();
152 if (jid.asBareJid().equals(context) && xmppUri.isAction("message") && xmppUri.getBody() != null) {
153 display = xmppUri.getBody();
154 } else if (jid.asBareJid().equals(context)) {
155 display = xmppUri.parameterString();
156 } else {
157 ListItem item = account.getBookmark(jid);
158 if (item == null) item = roster.getContact(jid);
159 display = item.getDisplayName() + xmppUri.parameterString();
160 }
161 body.replace(
162 body.getSpanStart(urlspan),
163 body.getSpanEnd(urlspan),
164 display
165 );
166 } catch (final IllegalArgumentException | IndexOutOfBoundsException e) { /* bad JID or span gone */ }
167 }
168 }
169 }
170
171 public static List<String> extractLinks(final Editable body) {
172 MyLinkify.addLinks(body, false);
173 final Collection<URLSpan> spans =
174 Arrays.asList(body.getSpans(0, body.length() - 1, URLSpan.class));
175 final Collection<UrlWrapper> urlWrappers =
176 Collections2.filter(
177 Collections2.transform(
178 spans,
179 s ->
180 s == null
181 ? null
182 : new UrlWrapper(body.getSpanStart(s), s.getURL())),
183 uw -> uw != null);
184 List<UrlWrapper> sorted = ImmutableList.sortedCopyOf(
185 (a, b) -> Integer.compare(a.position, b.position), urlWrappers);
186 return Lists.transform(sorted, uw -> uw.url);
187
188 }
189
190 private static class UrlWrapper {
191 private final int position;
192 private final String url;
193
194 private UrlWrapper(int position, String url) {
195 this.position = position;
196 this.url = url;
197 }
198 }
199}