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;
33
34import java.net.URI;
35import java.net.URISyntaxException;
36import java.util.regex.Pattern;
37
38import eu.siacs.conversations.entities.Conversational;
39import eu.siacs.conversations.entities.Message;
40import eu.siacs.conversations.http.AesGcmURL;
41import eu.siacs.conversations.http.URL;
42
43public class MessageUtils {
44
45 private static final Pattern LTR_RTL = Pattern.compile("(\\u200E[^\\u200F]*\\u200F){3,}");
46
47 private static final String EMPTY_STRING = "";
48
49 public static String prepareQuote(Message message) {
50 final StringBuilder builder = new StringBuilder();
51 final String body;
52 if (message.hasMeCommand()) {
53 final String nick;
54 if (message.getStatus() == Message.STATUS_RECEIVED) {
55 if (message.getConversation().getMode() == Conversational.MODE_MULTI) {
56 nick = Strings.nullToEmpty(message.getCounterpart().getResource());
57 } else {
58 nick = message.getContact().getPublicDisplayName();
59 }
60 } else {
61 nick = UIHelper.getMessageDisplayName(message);
62 }
63 body = nick + " " + message.getBody().substring(Message.ME_COMMAND.length());
64 } else {
65 body = message.getMergedBody().toString();
66 }
67 for (String line : body.split("\n")) {
68 if (line.length() <= 0) {
69 continue;
70 }
71 final char c = line.charAt(0);
72 if (c == '>' && UIHelper.isPositionFollowedByQuoteableCharacter(line, 0)
73 || (c == '\u00bb' && !UIHelper.isPositionFollowedByQuote(line, 0))) {
74 continue;
75 }
76 if (builder.length() != 0) {
77 builder.append('\n');
78 }
79 builder.append(line.trim());
80 }
81 return builder.toString();
82 }
83
84 public static boolean treatAsDownloadable(final String body, final boolean oob) {
85 final String[] lines = body.split("\n");
86 if (lines.length == 0) {
87 return false;
88 }
89 for (final String line : lines) {
90 if (line.contains("\\s+")) {
91 return false;
92 }
93 }
94 final URI uri;
95 try {
96 uri = new URI(lines[0]);
97 } catch (final URISyntaxException e) {
98 return false;
99 }
100 if (!URL.WELL_KNOWN_SCHEMES.contains(uri.getScheme())) {
101 return false;
102 }
103 final String ref = uri.getFragment();
104 final String protocol = uri.getScheme();
105 final boolean encrypted = ref != null && AesGcmURL.IV_KEY.matcher(ref).matches();
106 final boolean followedByDataUri = lines.length == 2 && lines[1].startsWith("data:");
107 final boolean validAesGcm = AesGcmURL.PROTOCOL_NAME.equalsIgnoreCase(protocol) && encrypted && (lines.length == 1 || followedByDataUri);
108 final boolean validProtocol = "http".equalsIgnoreCase(protocol) || "https".equalsIgnoreCase(protocol);
109 final boolean validOob = validProtocol && (oob || encrypted) && lines.length == 1;
110 return validAesGcm || validOob;
111 }
112
113 public static String filterLtrRtl(String body) {
114 return LTR_RTL.matcher(body).replaceFirst(EMPTY_STRING);
115 }
116
117 public static boolean unInitiatedButKnownSize(Message message) {
118 return message.getType() == Message.TYPE_TEXT && message.getTransferable() == null && message.isOOb() && message.getFileParams().size != null && message.getFileParams().url != null;
119 }
120}