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.ArrayList;
 9import java.util.Arrays;
10import java.util.Collections;
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 = {
18			"urn:xmpp:jingle:1",
19			"urn:xmpp:jingle:apps:file-transfer:3",
20			"urn:xmpp:jingle:transports:s5b:1",
21			"urn:xmpp:jingle:transports:ibb:1",
22			"http://jabber.org/protocol/muc",
23			"jabber:x:conference",
24			"http://jabber.org/protocol/caps",
25			"http://jabber.org/protocol/disco#info",
26			"urn:xmpp:avatar:metadata+notify",
27			"urn:xmpp:ping"};
28	public final String[] MESSAGE_CONFIRMATION_FEATURES = {
29			"urn:xmpp:chat-markers:0",
30			"urn:xmpp:receipts"
31	};
32	public final String IDENTITY_NAME = "Conversations 1.0-beta";
33	public final String IDENTITY_TYPE = "phone";
34
35	private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.US);
36
37	protected XmppConnectionService mXmppConnectionService;
38
39	protected AbstractGenerator(XmppConnectionService service) {
40		this.mXmppConnectionService = service;
41	}
42
43	public String getCapHash() {
44		StringBuilder s = new StringBuilder();
45		s.append("client/" + IDENTITY_TYPE + "//" + IDENTITY_NAME + "<");
46		MessageDigest md = null;
47		try {
48			md = MessageDigest.getInstance("SHA-1");
49		} catch (NoSuchAlgorithmException e) {
50			return null;
51		}
52		ArrayList<String> features = new ArrayList<>();
53		features.addAll(Arrays.asList(FEATURES));
54		if (mXmppConnectionService.confirmMessages()) {
55			features.addAll(Arrays.asList(MESSAGE_CONFIRMATION_FEATURES));
56		}
57		Collections.sort(features);
58		for (String feature : features) {
59			s.append(feature + "<");
60		}
61		byte[] sha1 = md.digest(s.toString().getBytes());
62		return new String(Base64.encode(sha1, Base64.DEFAULT)).trim();
63	}
64
65	public static String getTimestamp(long time) {
66		DATE_FORMAT.setTimeZone(TimeZone.getTimeZone("UTC"));
67		return DATE_FORMAT.format(time);
68	}
69}