1package eu.siacs.conversations.generator;
 2
 3import java.security.MessageDigest;
 4import java.security.NoSuchAlgorithmException;
 5import java.util.Arrays;
 6import java.util.Collections;
 7import java.util.List;
 8
 9import android.util.Base64;
10
11public abstract class AbstractGenerator {
12	public final String[] FEATURES = { "urn:xmpp:jingle:1",
13			"urn:xmpp:jingle:apps:file-transfer:3",
14			"urn:xmpp:jingle:transports:s5b:1",
15			"urn:xmpp:jingle:transports:ibb:1", "urn:xmpp:receipts",
16			"urn:xmpp:chat-markers:0", "http://jabber.org/protocol/muc",
17			"jabber:x:conference", "http://jabber.org/protocol/caps",
18			"http://jabber.org/protocol/disco#info",
19			"urn:xmpp:avatar:metadata+notify" };
20	public final String IDENTITY_NAME = "Conversations 0.7";
21	public final String IDENTITY_TYPE = "phone";
22
23	public String getCapHash() {
24		StringBuilder s = new StringBuilder();
25		s.append("client/" + IDENTITY_TYPE + "//" + IDENTITY_NAME + "<");
26		MessageDigest md = null;
27		try {
28			md = MessageDigest.getInstance("SHA-1");
29		} catch (NoSuchAlgorithmException e) {
30			return null;
31		}
32		List<String> features = Arrays.asList(FEATURES);
33		Collections.sort(features);
34		for (String feature : features) {
35			s.append(feature + "<");
36		}
37		byte[] sha1 = md.digest(s.toString().getBytes());
38		return new String(Base64.encode(sha1, Base64.DEFAULT)).trim();
39	}
40}