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 java.util.Locale;
39
40import eu.siacs.conversations.entities.Account;
41import eu.siacs.conversations.entities.ListItem;
42import eu.siacs.conversations.entities.Roster;
43import eu.siacs.conversations.ui.text.FixedURLSpan;
44import eu.siacs.conversations.utils.GeoHelper;
45import eu.siacs.conversations.utils.Patterns;
46import eu.siacs.conversations.utils.XmppUri;
47import eu.siacs.conversations.xmpp.Jid;
48
49public class MyLinkify {
50
51 private static final Linkify.TransformFilter WEBURL_TRANSFORM_FILTER = (matcher, url) -> {
52 if (url == null) {
53 return null;
54 }
55 final String lcUrl = url.toLowerCase(Locale.US);
56 if (lcUrl.startsWith("http://") || lcUrl.startsWith("https://")) {
57 return removeTrailingBracket(url);
58 } else {
59 return "http://" + removeTrailingBracket(url);
60 }
61 };
62
63 private static String removeTrailingBracket(final String url) {
64 int numOpenBrackets = 0;
65 for (char c : url.toCharArray()) {
66 if (c == '(') {
67 ++numOpenBrackets;
68 } else if (c == ')') {
69 --numOpenBrackets;
70 }
71 }
72 if (numOpenBrackets != 0 && url.charAt(url.length() - 1) == ')') {
73 return url.substring(0, url.length() - 1);
74 } else {
75 return url;
76 }
77 }
78
79 private static final Linkify.MatchFilter WEBURL_MATCH_FILTER = (cs, start, end) -> {
80 if (start > 0) {
81 if (cs.charAt(start - 1) == '@' || cs.charAt(start - 1) == '.'
82 || cs.subSequence(Math.max(0, start - 3), start).equals("://")) {
83 return false;
84 }
85 }
86
87 if (end < cs.length()) {
88 // Reject strings that were probably matched only because they contain a dot followed by
89 // by some known TLD (see also comment for WORD_BOUNDARY in Patterns.java)
90 return !isAlphabetic(cs.charAt(end - 1)) || !isAlphabetic(cs.charAt(end));
91 }
92
93 return true;
94 };
95
96 private static final Linkify.MatchFilter XMPPURI_MATCH_FILTER = (s, start, end) -> {
97 XmppUri uri = new XmppUri(s.subSequence(start, end).toString());
98 return uri.isValidJid();
99 };
100
101 private static boolean isAlphabetic(final int code) {
102 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
103 return Character.isAlphabetic(code);
104 }
105
106 switch (Character.getType(code)) {
107 case Character.UPPERCASE_LETTER:
108 case Character.LOWERCASE_LETTER:
109 case Character.TITLECASE_LETTER:
110 case Character.MODIFIER_LETTER:
111 case Character.OTHER_LETTER:
112 case Character.LETTER_NUMBER:
113 return true;
114 default:
115 return false;
116 }
117 }
118
119 public static void addLinks(Editable body, boolean includeGeo) {
120 Linkify.addLinks(body, Patterns.XMPP_PATTERN, "xmpp", XMPPURI_MATCH_FILTER, null);
121 Linkify.addLinks(body, Patterns.AUTOLINK_WEB_URL, "http", WEBURL_MATCH_FILTER, WEBURL_TRANSFORM_FILTER);
122 if (includeGeo) {
123 Linkify.addLinks(body, GeoHelper.GEO_URI, "geo");
124 }
125 FixedURLSpan.fix(body);
126 }
127
128 public static void addLinks(Editable body, Account account) {
129 addLinks(body, true);
130 Roster roster = account.getRoster();
131 for (final URLSpan urlspan : body.getSpans(0, body.length() - 1, URLSpan.class)) {
132 Uri uri = Uri.parse(urlspan.getURL());
133 if ("xmpp".equals(uri.getScheme())) {
134 try {
135 Jid jid = new XmppUri(uri).getJid();
136 ListItem item = account.getBookmark(jid);
137 if (item == null) item = roster.getContact(jid);
138 body.replace(
139 body.getSpanStart(urlspan),
140 body.getSpanEnd(urlspan),
141 item.getDisplayName()
142 );
143 } catch (final IllegalArgumentException e) { /* bad JID */ }
144 }
145 }
146 }
147}