1/*
2 * Copyright (c) 2017, 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.utils;
31
32import com.google.common.base.Strings;
33import eu.siacs.conversations.entities.Conversational;
34import eu.siacs.conversations.entities.Message;
35import eu.siacs.conversations.http.AesGcmURL;
36import eu.siacs.conversations.http.URL;
37import eu.siacs.conversations.ui.util.QuoteHelper;
38import java.net.URI;
39import java.net.URISyntaxException;
40import java.util.regex.Pattern;
41
42public class MessageUtils {
43
44 private static final Pattern LTR_RTL = Pattern.compile("(\\u200E[^\\u200F]*\\u200F){3,}");
45
46 public static final String EMPTY_STRING = "";
47
48 public static String prepareQuote(final Message message) {
49 final StringBuilder builder = new StringBuilder();
50 final String body;
51 if (message.hasMeCommand()) {
52 final String nick;
53 if (message.getStatus() == Message.STATUS_RECEIVED) {
54 if (message.getConversation().getMode() == Conversational.MODE_MULTI) {
55 nick = Strings.nullToEmpty(message.getCounterpart().getResource());
56 } else {
57 nick = message.getContact().getPublicDisplayName();
58 }
59 } else {
60 nick = UIHelper.getMessageDisplayName(message);
61 }
62 body = nick + " " + message.getQuoteableBody().substring(Message.ME_COMMAND.length());
63 } else {
64 body = message.getQuoteableBody();
65 }
66 for (String line : body.split("\n")) {
67 if (!(line.length() <= 0) && QuoteHelper.isNestedTooDeeply(line)) {
68 continue;
69 }
70 if (builder.length() != 0) {
71 builder.append('\n');
72 }
73 builder.append(line.trim());
74 }
75 return builder.toString();
76 }
77
78 public static boolean treatAsDownloadable(final String body, final boolean oob, final boolean legacyEncryption) {
79 if (oob) return true;
80
81 final String[] lines = body.split("\n");
82 if (lines.length == 0) {
83 return false;
84 }
85 for (final String line : lines) {
86 if (line.contains("\\s+")) {
87 return false;
88 }
89 }
90 final URI uri;
91 try {
92 uri = new URI(lines[0]);
93 } catch (final URISyntaxException e) {
94 return false;
95 }
96 if (!URL.WELL_KNOWN_SCHEMES.contains(uri.getScheme())) {
97 return false;
98 }
99 final String ref = uri.getFragment();
100 final String protocol = uri.getScheme();
101 final boolean encrypted = ref != null && AesGcmURL.IV_KEY.matcher(ref).matches();
102 final boolean followedByDataUri = lines.length == 2 && lines[1].startsWith("data:");
103 final boolean validAesGcm =
104 AesGcmURL.PROTOCOL_NAME.equalsIgnoreCase(protocol)
105 && encrypted
106 && (lines.length == 1 || followedByDataUri);
107 final boolean validProtocol =
108 "http".equalsIgnoreCase(protocol) || "https".equalsIgnoreCase(protocol);
109 final boolean validOob = validProtocol && (oob || encrypted || (legacyEncryption && uri.getPath() != null && (uri.getPath().endsWith(".xdc") || uri.getPath().endsWith(".webp") || uri.getPath().endsWith(".gif") || uri.getPath().endsWith(".png")))) && lines.length == 1;
110 return validAesGcm || validOob;
111 }
112
113 public static String aesgcmDownloadable(final String body) {
114 final String[] lines = body.split("\n");
115 if (lines.length == 0) {
116 return null;
117 }
118 for (final String line : lines) {
119 if (line.contains("\\s+")) {
120 return null;
121 }
122 }
123 final URI uri;
124 try {
125 uri = new URI(lines[0]);
126 } catch (final URISyntaxException e) {
127 return null;
128 }
129 if (!URL.WELL_KNOWN_SCHEMES.contains(uri.getScheme())) {
130 return null;
131 }
132 final String ref = uri.getFragment();
133 final String protocol = uri.getScheme();
134 final boolean encrypted = ref != null && AesGcmURL.IV_KEY.matcher(ref).matches();
135 final boolean followedByDataUri = lines.length == 2 && lines[1].startsWith("data:");
136 final boolean validAesGcm = AesGcmURL.PROTOCOL_NAME.equalsIgnoreCase(protocol) && encrypted && (lines.length == 1 || followedByDataUri);
137 return validAesGcm ? lines[0] : null;
138 }
139
140 public static String filterLtrRtl(String body) {
141 return LTR_RTL.matcher(body).replaceFirst(EMPTY_STRING);
142 }
143
144 public static boolean unInitiatedButKnownSize(Message message) {
145 return message.getType() == Message.TYPE_TEXT
146 && message.getTransferable() == null
147 && message.isOOb()
148 && (message.getFileParams().size != null || (message.getOob() != null && message.getOob().getScheme() != null && message.getOob().getScheme().equalsIgnoreCase("cid")))
149 && message.getFileParams().url != null;
150 }
151}