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.Config;
34import eu.siacs.conversations.entities.Conversational;
35import eu.siacs.conversations.entities.Message;
36import eu.siacs.conversations.http.AesGcmURL;
37import eu.siacs.conversations.http.URL;
38import eu.siacs.conversations.ui.util.QuoteHelper;
39import java.net.URI;
40import java.net.URISyntaxException;
41import java.util.regex.Pattern;
42
43public class MessageUtils {
44
45 private static final Pattern LTR_RTL = Pattern.compile("(\\u200E[^\\u200F]*\\u200F){3,}");
46
47 public static final String EMPTY_STRING = "";
48
49 public static String prepareQuote(final Message message) {
50 return prepareQuote(message, Config.QUOTING_MAX_DEPTH, -1);
51 }
52
53 public static String prepareQuote(final Message message, int maxDepth, int maxLines) {
54 final StringBuilder builder = new StringBuilder();
55 final String body;
56 if (message.hasMeCommand()) {
57 final String nick;
58 if (message.getStatus() == Message.STATUS_RECEIVED) {
59 if (message.getConversation().getMode() == Conversational.MODE_MULTI) {
60 nick = Strings.nullToEmpty(message.getCounterpart().getResource());
61 } else {
62 nick = message.getContact().getPublicDisplayName();
63 }
64 } else {
65 nick = UIHelper.getMessageDisplayName(message);
66 }
67 body = nick + " " + message.getQuoteableBody().substring(Message.ME_COMMAND.length());
68 } else {
69 body = message.getQuoteableBody();
70 }
71 int lines = 0;
72 for (String line : body.split("\n")) {
73 if (!(line.length() <= 0) && QuoteHelper.isNestedTooDeeply(line, maxDepth)) {
74 continue;
75 }
76 if (maxLines > 0 && maxLines <= lines) break;
77 if (builder.length() != 0) {
78 builder.append('\n');
79 }
80 builder.append(line.trim());
81 lines++;
82 }
83 return builder.toString();
84 }
85
86 public static boolean treatAsDownloadable(final String body, final boolean oob, final boolean legacyEncryption) {
87 if (oob) return true;
88
89 final String[] lines = body.split("\n");
90 if (lines.length == 0) {
91 return false;
92 }
93 for (final String line : lines) {
94 if (line.contains("\\s+")) {
95 return false;
96 }
97 }
98 final URI uri;
99 try {
100 uri = new URI(lines[0]);
101 } catch (final URISyntaxException e) {
102 return false;
103 }
104 if (!URL.WELL_KNOWN_SCHEMES.contains(uri.getScheme())) {
105 return false;
106 }
107 final String ref = uri.getFragment();
108 final String protocol = uri.getScheme();
109 final boolean encrypted = ref != null && AesGcmURL.IV_KEY.matcher(ref).matches();
110 final boolean followedByDataUri = lines.length == 2 && lines[1].startsWith("data:");
111 final boolean validAesGcm =
112 AesGcmURL.PROTOCOL_NAME.equalsIgnoreCase(protocol)
113 && encrypted
114 && (lines.length == 1 || followedByDataUri);
115 final boolean validProtocol =
116 "http".equalsIgnoreCase(protocol) || "https".equalsIgnoreCase(protocol);
117 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;
118 return validAesGcm || validOob;
119 }
120
121 public static String aesgcmDownloadable(final String body) {
122 final String[] lines = body.split("\n");
123 if (lines.length == 0) {
124 return null;
125 }
126 for (final String line : lines) {
127 if (line.contains("\\s+")) {
128 return null;
129 }
130 }
131 final URI uri;
132 try {
133 uri = new URI(lines[0]);
134 } catch (final URISyntaxException e) {
135 return null;
136 }
137 if (!URL.WELL_KNOWN_SCHEMES.contains(uri.getScheme())) {
138 return null;
139 }
140 final String ref = uri.getFragment();
141 final String protocol = uri.getScheme();
142 final boolean encrypted = ref != null && AesGcmURL.IV_KEY.matcher(ref).matches();
143 final boolean followedByDataUri = lines.length == 2 && lines[1].startsWith("data:");
144 final boolean validAesGcm = AesGcmURL.PROTOCOL_NAME.equalsIgnoreCase(protocol) && encrypted && (lines.length == 1 || followedByDataUri);
145 return validAesGcm ? lines[0] : null;
146 }
147
148 public static String filterLtrRtl(String body) {
149 return LTR_RTL.matcher(body).replaceFirst(EMPTY_STRING);
150 }
151
152 public static boolean unInitiatedButKnownSize(Message message) {
153 return message.getType() == Message.TYPE_TEXT
154 && message.getTransferable() == null
155 && message.isOOb()
156 && (message.getFileParams().size != null || (message.getOob() != null && message.getOob().getScheme() != null && message.getOob().getScheme().equalsIgnoreCase("cid")))
157 && message.getFileParams().url != null;
158 }
159}