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.List;
12import java.util.Locale;
13import java.util.TimeZone;
14
15import eu.siacs.conversations.services.XmppConnectionService;
16
17public abstract class AbstractGenerator {
18	private final String[] FEATURES = {
19			"urn:xmpp:jingle:1",
20			"urn:xmpp:jingle:apps:file-transfer:3",
21			"urn:xmpp:jingle:transports:s5b:1",
22			"urn:xmpp:jingle:transports:ibb:1",
23			"http://jabber.org/protocol/muc",
24			"jabber:x:conference",
25			"http://jabber.org/protocol/caps",
26			"http://jabber.org/protocol/disco#info",
27			"urn:xmpp:avatar:metadata+notify",
28			"urn:xmpp:ping"};
29	private final String[] MESSAGE_CONFIRMATION_FEATURES = {
30			"urn:xmpp:chat-markers:0",
31			"urn:xmpp:receipts"
32	};
33	public final String IDENTITY_NAME = "Conversations 1.0";
34	public final String IDENTITY_TYPE = "phone";
35
36	private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
37
38	protected XmppConnectionService mXmppConnectionService;
39
40	protected AbstractGenerator(XmppConnectionService service) {
41		this.mXmppConnectionService = service;
42	}
43
44	public String getCapHash() {
45		StringBuilder s = new StringBuilder();
46		s.append("client/" + IDENTITY_TYPE + "//" + IDENTITY_NAME + "<");
47		MessageDigest md = null;
48		try {
49			md = MessageDigest.getInstance("SHA-1");
50		} catch (NoSuchAlgorithmException e) {
51			return null;
52		}
53
54		for (String feature : getFeatures()) {
55			s.append(feature + "<");
56		}
57		byte[] sha1 = md.digest(s.toString().getBytes());
58		return new String(Base64.encode(sha1, Base64.DEFAULT)).trim();
59	}
60
61	public static String getTimestamp(long time) {
62		DATE_FORMAT.setTimeZone(TimeZone.getTimeZone("UTC"));
63		return DATE_FORMAT.format(time);
64	}
65
66	public List<String> getFeatures() {
67		ArrayList<String> features = new ArrayList<>();
68		features.addAll(Arrays.asList(FEATURES));
69		if (mXmppConnectionService.confirmMessages()) {
70			features.addAll(Arrays.asList(MESSAGE_CONFIRMATION_FEATURES));
71		}
72		Collections.sort(features);
73		return features;
74	}
75}