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 de.gultsch.common;
31
32import android.net.Uri;
33import android.text.Editable;
34import android.text.Spanned;
35import android.text.style.TypefaceSpan;
36import android.text.style.URLSpan;
37import android.text.Spannable;
38import com.google.common.base.Splitter;
39import com.google.common.collect.Collections2;
40import com.google.common.collect.ImmutableList;
41import com.google.common.collect.Iterables;
42import com.google.common.collect.Lists;
43import eu.siacs.conversations.entities.Account;
44import eu.siacs.conversations.entities.ListItem;
45import eu.siacs.conversations.utils.StylingHelper;
46import eu.siacs.conversations.utils.XmppUri;
47import eu.siacs.conversations.xmpp.Jid;
48import java.net.URI;
49import java.net.URISyntaxException;
50import java.util.Arrays;
51import java.util.List;
52import java.util.Objects;
53
54public class Linkify {
55
56 private static final android.text.util.Linkify.MatchFilter MATCH_FILTER =
57 (s, start, end) -> isPassAdditionalValidation(s.subSequence(start, end).toString());
58
59 private static boolean isPassAdditionalValidation(final String match) {
60 final var scheme = Iterables.getFirst(Splitter.on(':').limit(2).splitToList(match), null);
61 if (scheme == null) {
62 return false;
63 }
64 if (!isValidUri(match)) {
65 return false;
66 }
67 return switch (scheme) {
68 case "tel" -> Patterns.URI_TEL.matcher(match).matches();
69 case "http", "https" -> Patterns.URI_HTTP.matcher(match).matches();
70 case "geo" -> Patterns.URI_GEO.matcher(match).matches();
71 case "xmpp" -> new XmppUri(Uri.parse(match)).isValidJid();
72 case "web+ap" -> {
73 if (Patterns.URI_WEB_AP.matcher(match).matches()) {
74 final var webAp = new MiniUri(match);
75 // TODO once we have fragment support check that there aren't any
76 yield Objects.nonNull(webAp.getAuthority()) && webAp.getParameter().isEmpty();
77 } else {
78 yield false;
79 }
80 }
81 default -> true;
82 };
83 }
84
85 private static boolean isValidUri(final String match) {
86 try {
87 new URI(match);
88 return true;
89 } catch (final URISyntaxException e) {
90 return false;
91 }
92 }
93
94 public static void addLinks(final Spannable body) {
95 android.text.util.Linkify.addLinks(body, Patterns.URI_GENERIC, null, MATCH_FILTER, null);
96 }
97
98 public static void addLinks(final Editable body, final Account account, final Jid context) {
99 addLinks(body);
100 final var roster = account.getRoster();
101 urlspan:
102 for (final URLSpan urlspan : body.getSpans(0, body.length() - 1, URLSpan.class)) {
103 final var start = body.getSpanStart(urlspan);
104 if (start < 0) continue;
105 for (final var span : body.getSpans(start, start, Object.class)) {
106 // instanceof TypefaceSpan is to block in XHTML code blocks. Probably a bit heavy-handed but works for now
107 if ((body.getSpanFlags(span) & Spanned.SPAN_USER) >> Spanned.SPAN_USER_SHIFT == StylingHelper.NOLINKIFY || span instanceof TypefaceSpan) {
108 body.removeSpan(urlspan);
109 continue urlspan;
110 }
111 }
112 Uri uri = Uri.parse(urlspan.getURL());
113 if ("xmpp".equals(uri.getScheme())) {
114 try {
115 if (!body.subSequence(body.getSpanStart(urlspan), body.getSpanEnd(urlspan)).toString().startsWith("xmpp:")) {
116 // Already customized
117 continue;
118 }
119
120 XmppUri xmppUri = new XmppUri(uri);
121 Jid jid = xmppUri.getJid();
122 String display = xmppUri.toString();
123 if (jid.asBareJid().equals(context) && xmppUri.isAction("message") && xmppUri.getBody() != null) {
124 display = xmppUri.getBody();
125 } else if (jid.asBareJid().equals(context) && xmppUri.parameterString().length() > 0) {
126 display = xmppUri.parameterString();
127 } else {
128 ListItem item = account.getBookmark(jid);
129 if (item == null) item = roster.getContact(jid);
130 display = item.getDisplayName() + xmppUri.displayParameterString();
131 }
132 body.replace(
133 body.getSpanStart(urlspan),
134 body.getSpanEnd(urlspan),
135 display
136 );
137 } catch (final IllegalArgumentException | IndexOutOfBoundsException e) { /* bad JID or span gone */ }
138 }
139 }
140 }
141
142 public static List<MiniUri> getLinks(final String body) {
143 final var builder = new ImmutableList.Builder<MiniUri>();
144 final var matcher = Patterns.URI_GENERIC.matcher(body);
145 while (matcher.find()) {
146 final var match = matcher.group();
147 if (isPassAdditionalValidation(match)) {
148 builder.add(new MiniUri(match));
149 }
150 }
151 return builder.build();
152 }
153
154 public static List<String> extractLinks(final Editable body) {
155 addLinks(body);
156 final var spans =
157 Arrays.asList(body.getSpans(0, body.length() - 1, URLSpan.class));
158 final var urlWrappers =
159 Collections2.filter(
160 Collections2.transform(
161 spans,
162 s ->
163 s == null
164 ? null
165 : new UrlWrapper(body.getSpanStart(s), s.getURL())),
166 uw -> uw != null);
167 List<UrlWrapper> sorted = ImmutableList.sortedCopyOf(
168 (a, b) -> Integer.compare(a.position, b.position), urlWrappers);
169 return Lists.transform(sorted, uw -> uw.url);
170
171 }
172
173 private static class UrlWrapper {
174 private final int position;
175 private final String url;
176
177 private UrlWrapper(int position, String url) {
178 this.position = position;
179 this.url = url;
180 }
181 }
182}