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