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 android.net.Uri;
33
34import com.google.common.base.Strings;
35
36import java.net.URI;
37import java.net.URISyntaxException;
38import java.util.regex.Pattern;
39
40import eu.siacs.conversations.entities.Conversational;
41import eu.siacs.conversations.entities.Message;
42import eu.siacs.conversations.http.AesGcmURL;
43import eu.siacs.conversations.http.URL;
44
45public class MessageUtils {
46
47 private static final Pattern LTR_RTL = Pattern.compile("(\\u200E[^\\u200F]*\\u200F){3,}");
48
49 private static final String EMPTY_STRING = "";
50
51 public static String prepareQuote(Message message) {
52 final StringBuilder builder = new StringBuilder();
53 final String body;
54 if (message.hasMeCommand()) {
55 final String nick;
56 if (message.getStatus() == Message.STATUS_RECEIVED) {
57 if (message.getConversation().getMode() == Conversational.MODE_MULTI) {
58 nick = Strings.nullToEmpty(message.getCounterpart().getResource());
59 } else {
60 nick = message.getContact().getPublicDisplayName();
61 }
62 } else {
63 nick = UIHelper.getMessageDisplayName(message);
64 }
65 body = nick + " " + message.getBody().substring(Message.ME_COMMAND.length());
66 } else {
67 body = message.getMergedBody().toString();
68 }
69 for (String line : body.split("\n")) {
70 if (line.length() <= 0) {
71 continue;
72 }
73 final char c = line.charAt(0);
74 if (c == '>' && UIHelper.isPositionFollowedByQuoteableCharacter(line, 0)
75 || (c == '\u00bb' && !UIHelper.isPositionFollowedByQuote(line, 0))) {
76 continue;
77 }
78 if (builder.length() != 0) {
79 builder.append('\n');
80 }
81 builder.append(line.trim());
82 }
83 return builder.toString();
84 }
85
86 public static boolean treatAsDownloadable(final String body, final boolean oob) {
87 final String[] lines = body.split("\n");
88 if (lines.length == 0) {
89 return false;
90 }
91 for (final String line : lines) {
92 if (line.contains("\\s+")) {
93 return false;
94 }
95 }
96 final URI uri;
97 try {
98 uri = new URI(lines[0]);
99 } catch (final URISyntaxException e) {
100 return false;
101 }
102 if (!URL.WELL_KNOWN_SCHEMES.contains(uri.getScheme())) {
103 return false;
104 }
105 final String ref = uri.getFragment();
106 final String protocol = uri.getScheme();
107 final boolean encrypted = ref != null && AesGcmURL.IV_KEY.matcher(ref).matches();
108 final boolean followedByDataUri = lines.length == 2 && lines[1].startsWith("data:");
109 final boolean validAesGcm = AesGcmURL.PROTOCOL_NAME.equalsIgnoreCase(protocol) && encrypted && (lines.length == 1 || followedByDataUri);
110 final boolean validProtocol = "http".equalsIgnoreCase(protocol) || "https".equalsIgnoreCase(protocol);
111 final boolean validOob = validProtocol && (oob || encrypted) && lines.length == 1;
112 return validAesGcm || validOob;
113 }
114
115 public static String filterLtrRtl(String body) {
116 return LTR_RTL.matcher(body).replaceFirst(EMPTY_STRING);
117 }
118
119 public static boolean unInitiatedButKnownSize(Message message) {
120 return message.getType() == Message.TYPE_TEXT && message.getTransferable() == null && message.isOOb() && message.getFileParams().size > 0 && message.getFileParams().url != null;
121 }
122}