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			"urn:xmpp:message-correct:0",
35			"jabber:iq:version",
36			"http://jabber.org/protocol/chatstates",
37			AxolotlService.PEP_DEVICE_LIST+"+notify"};
38	private final String[] MESSAGE_CONFIRMATION_FEATURES = {
39			"urn:xmpp:chat-markers:0",
40			"urn:xmpp:receipts"
41	};
42	private String mVersion = null;
43	protected final String IDENTITY_NAME = "Conversations";
44	protected final String IDENTITY_TYPE = "phone";
45
46	private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
47
48	protected XmppConnectionService mXmppConnectionService;
49
50	protected AbstractGenerator(XmppConnectionService service) {
51		this.mXmppConnectionService = service;
52	}
53
54	protected String getIdentityVersion() {
55		if (mVersion == null) {
56			this.mVersion = PhoneHelper.getVersionName(mXmppConnectionService);
57		}
58		return this.mVersion;
59	}
60
61	public String getIdentityName() {
62		return IDENTITY_NAME + " " + getIdentityVersion();
63	}
64
65	public String getCapHash() {
66		StringBuilder s = new StringBuilder();
67		s.append("client/" + IDENTITY_TYPE + "//" + getIdentityName() + "<");
68		MessageDigest md;
69		try {
70			md = MessageDigest.getInstance("SHA-1");
71		} catch (NoSuchAlgorithmException e) {
72			return null;
73		}
74
75		for (String feature : getFeatures()) {
76			s.append(feature + "<");
77		}
78		byte[] sha1 = md.digest(s.toString().getBytes());
79		return new String(Base64.encode(sha1, Base64.DEFAULT)).trim();
80	}
81
82	public static String getTimestamp(long time) {
83		DATE_FORMAT.setTimeZone(TimeZone.getTimeZone("UTC"));
84		return DATE_FORMAT.format(time);
85	}
86
87	public List<String> getFeatures() {
88		ArrayList<String> features = new ArrayList<>();
89		features.addAll(Arrays.asList(FEATURES));
90		if (mXmppConnectionService.confirmMessages()) {
91			features.addAll(Arrays.asList(MESSAGE_CONFIRMATION_FEATURES));
92		}
93		Collections.sort(features);
94		return features;
95	}
96}