1package eu.siacs.conversations.generator;
 2
 3import android.util.Base64;
 4
 5import java.security.MessageDigest;
 6import java.security.NoSuchAlgorithmException;
 7import java.text.SimpleDateFormat;
 8import java.util.Arrays;
 9import java.util.Collections;
10import java.util.List;
11import java.util.Locale;
12import java.util.TimeZone;
13
14import eu.siacs.conversations.services.XmppConnectionService;
15
16public abstract class AbstractGenerator {
17	public final String[] FEATURES = {"urn:xmpp:jingle:1",
18			"urn:xmpp:jingle:apps:file-transfer:3",
19			"urn:xmpp:jingle:transports:s5b:1",
20			"urn:xmpp:jingle:transports:ibb:1", "urn:xmpp:receipts",
21			"urn:xmpp:chat-markers:0", "http://jabber.org/protocol/muc",
22			"jabber:x:conference", "http://jabber.org/protocol/caps",
23			"http://jabber.org/protocol/disco#info",
24			"urn:xmpp:avatar:metadata+notify",
25			"urn:xmpp:ping"};
26	public final String IDENTITY_NAME = "Conversations 1.0-beta";
27	public final String IDENTITY_TYPE = "phone";
28
29	private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.US);
30
31	protected XmppConnectionService mXmppConnectionService;
32
33	protected AbstractGenerator(XmppConnectionService service) {
34		this.mXmppConnectionService = service;
35	}
36
37	public String getCapHash() {
38		StringBuilder s = new StringBuilder();
39		s.append("client/" + IDENTITY_TYPE + "//" + IDENTITY_NAME + "<");
40		MessageDigest md = null;
41		try {
42			md = MessageDigest.getInstance("SHA-1");
43		} catch (NoSuchAlgorithmException e) {
44			return null;
45		}
46		List<String> features = Arrays.asList(FEATURES);
47		Collections.sort(features);
48		for (String feature : features) {
49			s.append(feature + "<");
50		}
51		byte[] sha1 = md.digest(s.toString().getBytes());
52		return new String(Base64.encode(sha1, Base64.DEFAULT)).trim();
53	}
54
55	public static String getTimestamp(long time) {
56		DATE_FORMAT.setTimeZone(TimeZone.getTimeZone("UTC"));
57		return DATE_FORMAT.format(time);
58	}
59}