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