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.crypto.axolotl.AxolotlService;
16import eu.siacs.conversations.services.XmppConnectionService;
17import eu.siacs.conversations.utils.PhoneHelper;
18import eu.siacs.conversations.xmpp.jid.Jid;
19import eu.siacs.conversations.xmpp.stanzas.IqPacket;
20
21public abstract class AbstractGenerator {
22	private final String[] FEATURES = {
23			"urn:xmpp:jingle:1",
24			"urn:xmpp:jingle:apps:file-transfer:3",
25			"urn:xmpp:jingle:transports:s5b:1",
26			"urn:xmpp:jingle:transports:ibb:1",
27			"http://jabber.org/protocol/muc",
28			"jabber:x:conference",
29			"http://jabber.org/protocol/caps",
30			"http://jabber.org/protocol/disco#info",
31			"urn:xmpp:avatar:metadata+notify",
32			"http://jabber.org/protocol/nick+notify",
33			"urn:xmpp:ping",
34			"jabber:iq:version",
35			"http://jabber.org/protocol/chatstates",
36			AxolotlService.PEP_DEVICE_LIST+"+notify"};
37	private final String[] MESSAGE_CONFIRMATION_FEATURES = {
38			"urn:xmpp:chat-markers:0",
39			"urn:xmpp:receipts"
40	};
41	private String mVersion = null;
42	protected final String IDENTITY_NAME = "Conversations";
43	protected final String IDENTITY_TYPE = "phone";
44
45	private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
46
47	protected XmppConnectionService mXmppConnectionService;
48
49	protected AbstractGenerator(XmppConnectionService service) {
50		this.mXmppConnectionService = service;
51	}
52
53	protected String getIdentityVersion() {
54		if (mVersion == null) {
55			this.mVersion = PhoneHelper.getVersionName(mXmppConnectionService);
56		}
57		return this.mVersion;
58	}
59
60	public String getIdentityName() {
61		return IDENTITY_NAME + " " + getIdentityVersion();
62	}
63
64	public String getCapHash() {
65		StringBuilder s = new StringBuilder();
66		s.append("client/" + IDENTITY_TYPE + "//" + getIdentityName() + "<");
67		MessageDigest md;
68		try {
69			md = MessageDigest.getInstance("SHA-1");
70		} catch (NoSuchAlgorithmException e) {
71			return null;
72		}
73
74		for (String feature : getFeatures()) {
75			s.append(feature + "<");
76		}
77		byte[] sha1 = md.digest(s.toString().getBytes());
78		return new String(Base64.encode(sha1, Base64.DEFAULT)).trim();
79	}
80
81	public static String getTimestamp(long time) {
82		DATE_FORMAT.setTimeZone(TimeZone.getTimeZone("UTC"));
83		return DATE_FORMAT.format(time);
84	}
85
86	public List<String> getFeatures() {
87		ArrayList<String> features = new ArrayList<>();
88		features.addAll(Arrays.asList(FEATURES));
89		if (mXmppConnectionService.confirmMessages()) {
90			features.addAll(Arrays.asList(MESSAGE_CONFIRMATION_FEATURES));
91		}
92		Collections.sort(features);
93		return features;
94	}
95}