1package eu.siacs.conversations.generator;
 2
 3import android.util.Base64;
 4
 5import java.security.MessageDigest;
 6import java.security.NoSuchAlgorithmException;
 7import java.util.Arrays;
 8import java.util.Collections;
 9import java.util.List;
10
11import eu.siacs.conversations.services.XmppConnectionService;
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			"urn:xmpp:ping"};
23	public final String IDENTITY_NAME = "Conversations 0.9.2";
24	public final String IDENTITY_TYPE = "phone";
25
26	protected XmppConnectionService mXmppConnectionService;
27
28	protected AbstractGenerator(XmppConnectionService service) {
29		this.mXmppConnectionService = service;
30	}
31
32	public String getCapHash() {
33		StringBuilder s = new StringBuilder();
34		s.append("client/" + IDENTITY_TYPE + "//" + IDENTITY_NAME + "<");
35		MessageDigest md = null;
36		try {
37			md = MessageDigest.getInstance("SHA-1");
38		} catch (NoSuchAlgorithmException e) {
39			return null;
40		}
41		List<String> features = Arrays.asList(FEATURES);
42		Collections.sort(features);
43		for (String feature : features) {
44			s.append(feature + "<");
45		}
46		byte[] sha1 = md.digest(s.toString().getBytes());
47		return new String(Base64.encode(sha1, Base64.DEFAULT)).trim();
48	}
49}