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 eu.siacs.conversations.services.XmppConnectionService;
10
11import android.util.Base64;
12
13public abstract class AbstractGenerator {
14	public final String[] FEATURES = { "urn:xmpp:jingle:1",
15			"urn:xmpp:jingle:apps:file-transfer:3",
16			"urn:xmpp:jingle:transports:s5b:1",
17			"urn:xmpp:jingle:transports:ibb:1", "urn:xmpp:receipts",
18			"urn:xmpp:chat-markers:0", "http://jabber.org/protocol/muc",
19			"jabber:x:conference", "http://jabber.org/protocol/caps",
20			"http://jabber.org/protocol/disco#info",
21			"urn:xmpp:avatar:metadata+notify" };
22	public final String IDENTITY_NAME = "Conversations 0.7";
23	public final String IDENTITY_TYPE = "phone";
24
25	protected XmppConnectionService mXmppConnectionService;
26
27	protected AbstractGenerator(XmppConnectionService service) {
28		this.mXmppConnectionService = service;
29	}
30
31	public String getCapHash() {
32		StringBuilder s = new StringBuilder();
33		s.append("client/" + IDENTITY_TYPE + "//" + IDENTITY_NAME + "<");
34		MessageDigest md = null;
35		try {
36			md = MessageDigest.getInstance("SHA-1");
37		} catch (NoSuchAlgorithmException e) {
38			return null;
39		}
40		List<String> features = Arrays.asList(FEATURES);
41		Collections.sort(features);
42		for (String feature : features) {
43			s.append(feature + "<");
44		}
45		byte[] sha1 = md.digest(s.toString().getBytes());
46		return new String(Base64.encode(sha1, Base64.DEFAULT)).trim();
47	}
48}