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.style.URLSpan;
35import android.text.util.Linkify;
36
37import com.google.common.collect.Collections2;
38import com.google.common.collect.ImmutableList;
39import com.google.common.collect.Lists;
40
41import java.util.Arrays;
42import java.util.Collection;
43import java.util.List;
44import java.util.Locale;
45import java.util.Objects;
46
47import eu.siacs.conversations.ui.text.FixedURLSpan;
48import eu.siacs.conversations.utils.GeoHelper;
49import eu.siacs.conversations.utils.Patterns;
50import eu.siacs.conversations.utils.XmppUri;
51
52public class MyLinkify {
53
54 private static final Linkify.TransformFilter WEBURL_TRANSFORM_FILTER = (matcher, url) -> {
55 if (url == null) {
56 return null;
57 }
58 final String lcUrl = url.toLowerCase(Locale.US);
59 if (lcUrl.startsWith("http://") || lcUrl.startsWith("https://")) {
60 return removeTrailingBracket(url);
61 } else {
62 return "http://" + removeTrailingBracket(url);
63 }
64 };
65
66 private static String removeTrailingBracket(final String url) {
67 int numOpenBrackets = 0;
68 for (char c : url.toCharArray()) {
69 if (c == '(') {
70 ++numOpenBrackets;
71 } else if (c == ')') {
72 --numOpenBrackets;
73 }
74 }
75 if (numOpenBrackets != 0 && url.charAt(url.length() - 1) == ')') {
76 return url.substring(0, url.length() - 1);
77 } else {
78 return url;
79 }
80 }
81
82 private static final Linkify.MatchFilter WEBURL_MATCH_FILTER = (cs, start, end) -> {
83 if (start > 0) {
84 if (cs.charAt(start - 1) == '@' || cs.charAt(start - 1) == '.'
85 || cs.subSequence(Math.max(0, start - 3), start).equals("://")) {
86 return false;
87 }
88 }
89
90 if (end < cs.length()) {
91 // Reject strings that were probably matched only because they contain a dot followed by
92 // by some known TLD (see also comment for WORD_BOUNDARY in Patterns.java)
93 return !isAlphabetic(cs.charAt(end - 1)) || !isAlphabetic(cs.charAt(end));
94 }
95
96 return true;
97 };
98
99 private static final Linkify.MatchFilter XMPPURI_MATCH_FILTER = (s, start, end) -> {
100 XmppUri uri = new XmppUri(s.subSequence(start, end).toString());
101 return uri.isValidJid();
102 };
103
104 private static boolean isAlphabetic(final int code) {
105 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
106 return Character.isAlphabetic(code);
107 }
108
109 switch (Character.getType(code)) {
110 case Character.UPPERCASE_LETTER:
111 case Character.LOWERCASE_LETTER:
112 case Character.TITLECASE_LETTER:
113 case Character.MODIFIER_LETTER:
114 case Character.OTHER_LETTER:
115 case Character.LETTER_NUMBER:
116 return true;
117 default:
118 return false;
119 }
120 }
121
122 public static void addLinks(Editable body, boolean includeGeo) {
123 Linkify.addLinks(body, Patterns.XMPP_PATTERN, "xmpp", XMPPURI_MATCH_FILTER, null);
124 Linkify.addLinks(body, Patterns.AUTOLINK_WEB_URL, "http", WEBURL_MATCH_FILTER, WEBURL_TRANSFORM_FILTER);
125 if (includeGeo) {
126 Linkify.addLinks(body, GeoHelper.GEO_URI, "geo");
127 }
128 FixedURLSpan.fix(body);
129 }
130
131 public static List<String> extractLinks(final Editable body) {
132 MyLinkify.addLinks(body, false);
133 final Collection<URLSpan> spans =
134 Arrays.asList(body.getSpans(0, body.length() - 1, URLSpan.class));
135 final Collection<UrlWrapper> urlWrappers =
136 Collections2.filter(
137 Collections2.transform(
138 spans,
139 s ->
140 s == null
141 ? null
142 : new UrlWrapper(body.getSpanStart(s), s.getURL())),
143 uw -> uw != null);
144 List<UrlWrapper> sorted = ImmutableList.sortedCopyOf(
145 (a, b) -> Integer.compare(a.position, b.position), urlWrappers);
146 return Lists.transform(sorted, uw -> uw.url);
147
148 }
149
150 private static class UrlWrapper {
151 private final int position;
152 private final String url;
153
154 private UrlWrapper(int position, String url) {
155 this.position = position;
156 this.url = url;
157 }
158 }
159}