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 java.net.MalformedURLException;
33import java.net.URL;
34
35import eu.siacs.conversations.entities.Message;
36import eu.siacs.conversations.http.AesGcmURLStreamHandler;
37
38public class MessageUtils {
39	public static String prepareQuote(Message message) {
40		final StringBuilder builder = new StringBuilder();
41		final String body = message.getMergedBody().toString();
42		for(String line : body.split("\n")) {
43			if (line.length() <= 0) {
44				continue;
45			}
46			final char c = line.charAt(0);
47			if (c == '>' && UIHelper.isPositionFollowedByQuoteableCharacter(line,0)
48					|| (c == '\u00bb' && !UIHelper.isPositionFollowedByQuote(line,0))) {
49				continue;
50			}
51			if (builder.length() != 0 ) {
52				builder.append('\n');
53			}
54			builder.append(line.trim());
55		}
56		return builder.toString();
57	}
58
59	public static boolean treatAsDownloadable(final String body, final boolean oob) {
60		try {
61			final String[] lines = body.split("\n");
62			if (lines.length == 0) {
63				return false;
64			}
65			for (String line : lines) {
66				if (line.contains("\\s+")) {
67					return false;
68				}
69			}
70			final URL url = new URL(lines[0]);
71			final String ref = url.getRef();
72			final String protocol = url.getProtocol();
73			final boolean encrypted = ref != null && AesGcmURLStreamHandler.IV_KEY.matcher(ref).matches();
74			final boolean followedByDataUri = lines.length == 2 && lines[1].startsWith("data:");
75			final boolean validAesGcm = AesGcmURLStreamHandler.PROTOCOL_NAME.equalsIgnoreCase(protocol) && encrypted && (lines.length == 1 || followedByDataUri);
76			final boolean validOob = ("http".equalsIgnoreCase(protocol) || "https".equalsIgnoreCase(protocol)) && (oob || encrypted) && lines.length == 1;
77			return validAesGcm || validOob;
78		} catch (MalformedURLException e) {
79			return false;
80		}
81	}
82}