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.getBody().substring(Message.ME_COMMAND.length());
63 } else {
64 body = message.getBody();
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) {
79 final String[] lines = body.split("\n");
80 if (lines.length == 0) {
81 return false;
82 }
83 for (final String line : lines) {
84 if (line.contains("\\s+")) {
85 return false;
86 }
87 }
88 final URI uri;
89 try {
90 uri = new URI(lines[0]);
91 } catch (final URISyntaxException e) {
92 return false;
93 }
94 if (!URL.WELL_KNOWN_SCHEMES.contains(uri.getScheme())) {
95 return false;
96 }
97 final String ref = uri.getFragment();
98 final String protocol = uri.getScheme();
99 final boolean encrypted = ref != null && AesGcmURL.IV_KEY.matcher(ref).matches();
100 final boolean followedByDataUri = lines.length == 2 && lines[1].startsWith("data:");
101 final boolean validAesGcm =
102 AesGcmURL.PROTOCOL_NAME.equalsIgnoreCase(protocol)
103 && encrypted
104 && (lines.length == 1 || followedByDataUri);
105 final boolean validProtocol =
106 "http".equalsIgnoreCase(protocol) || "https".equalsIgnoreCase(protocol);
107 final boolean validOob = validProtocol && (oob || encrypted) && lines.length == 1;
108 return validAesGcm || validOob;
109 }
110
111 public static String filterLtrRtl(String body) {
112 return LTR_RTL.matcher(body).replaceFirst(EMPTY_STRING);
113 }
114
115 public static boolean unInitiatedButKnownSize(Message message) {
116 return message.getType() == Message.TYPE_TEXT
117 && message.getTransferable() == null
118 && message.isOOb()
119 && message.getFileParams().size != null
120 && message.getFileParams().url != null;
121 }
122}