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.os.Build;
33import android.text.Editable;
34import android.text.util.Linkify;
35
36import java.util.Locale;
37
38import eu.siacs.conversations.ui.text.FixedURLSpan;
39import eu.siacs.conversations.utils.GeoHelper;
40import eu.siacs.conversations.utils.Patterns;
41import eu.siacs.conversations.utils.XmppUri;
42
43public class MyLinkify {
44
45 private static final Linkify.TransformFilter WEBURL_TRANSFORM_FILTER = (matcher, url) -> {
46 if (url == null) {
47 return null;
48 }
49 final String lcUrl = url.toLowerCase(Locale.US);
50 if (lcUrl.startsWith("http://") || lcUrl.startsWith("https://")) {
51 return removeTrailingBracket(url);
52 } else {
53 return "http://" + removeTrailingBracket(url);
54 }
55 };
56
57 private static String removeTrailingBracket(final String url) {
58 int numOpenBrackets = 0;
59 for (char c : url.toCharArray()) {
60 if (c == '(') {
61 ++numOpenBrackets;
62 } else if (c == ')') {
63 --numOpenBrackets;
64 }
65 }
66 if (numOpenBrackets != 0 && url.charAt(url.length() - 1) == ')') {
67 return url.substring(0, url.length() - 1);
68 } else {
69 return url;
70 }
71 }
72
73 private static final Linkify.MatchFilter WEBURL_MATCH_FILTER = (cs, start, end) -> {
74 if (start > 0) {
75 if (cs.charAt(start - 1) == '@' || cs.charAt(start - 1) == '.'
76 || cs.subSequence(Math.max(0, start - 3), start).equals("://")) {
77 return false;
78 }
79 }
80
81 if (end < cs.length()) {
82 // Reject strings that were probably matched only because they contain a dot followed by
83 // by some known TLD (see also comment for WORD_BOUNDARY in Patterns.java)
84 return !isAlphabetic(cs.charAt(end - 1)) || !isAlphabetic(cs.charAt(end));
85 }
86
87 return true;
88 };
89
90 private static final Linkify.MatchFilter XMPPURI_MATCH_FILTER = (s, start, end) -> {
91 XmppUri uri = new XmppUri(s.subSequence(start, end).toString());
92 return uri.isValidJid();
93 };
94
95 private static boolean isAlphabetic(final int code) {
96 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
97 return Character.isAlphabetic(code);
98 }
99
100 switch (Character.getType(code)) {
101 case Character.UPPERCASE_LETTER:
102 case Character.LOWERCASE_LETTER:
103 case Character.TITLECASE_LETTER:
104 case Character.MODIFIER_LETTER:
105 case Character.OTHER_LETTER:
106 case Character.LETTER_NUMBER:
107 return true;
108 default:
109 return false;
110 }
111 }
112
113 public static void addLinks(Editable body, boolean includeGeo) {
114 Linkify.addLinks(body, Patterns.XMPP_PATTERN, "xmpp", XMPPURI_MATCH_FILTER, null);
115 Linkify.addLinks(body, Patterns.AUTOLINK_WEB_URL, "http", WEBURL_MATCH_FILTER, WEBURL_TRANSFORM_FILTER);
116 if (includeGeo) {
117 Linkify.addLinks(body, GeoHelper.GEO_URI, "geo");
118 }
119 FixedURLSpan.fix(body);
120 }
121}