1package eu.siacs.conversations.generator;
2
3import android.util.Base64;
4
5import eu.siacs.conversations.BuildConfig;
6import eu.siacs.conversations.Config;
7import eu.siacs.conversations.R;
8import eu.siacs.conversations.crypto.axolotl.AxolotlService;
9import eu.siacs.conversations.entities.Account;
10import eu.siacs.conversations.services.XmppConnectionService;
11import eu.siacs.conversations.xml.Namespace;
12import eu.siacs.conversations.xmpp.XmppConnection;
13
14import java.security.MessageDigest;
15import java.security.NoSuchAlgorithmException;
16import java.text.SimpleDateFormat;
17import java.util.ArrayList;
18import java.util.Arrays;
19import java.util.Collections;
20import java.util.List;
21import java.util.Locale;
22import java.util.TimeZone;
23
24public abstract class AbstractGenerator {
25 private static final SimpleDateFormat DATE_FORMAT =
26 new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.US);
27 private final String[] FEATURES = {
28 Namespace.JINGLE,
29 Namespace.JINGLE_APPS_FILE_TRANSFER,
30 Namespace.JINGLE_TRANSPORTS_S5B,
31 Namespace.JINGLE_TRANSPORTS_IBB,
32 Namespace.JINGLE_ENCRYPTED_TRANSPORT,
33 Namespace.JINGLE_ENCRYPTED_TRANSPORT_OMEMO,
34 "http://jabber.org/protocol/muc",
35 "jabber:x:conference",
36 Namespace.OOB,
37 "http://jabber.org/protocol/caps",
38 "http://jabber.org/protocol/disco#info",
39 "urn:xmpp:avatar:metadata+notify",
40 Namespace.NICK + "+notify",
41 "urn:xmpp:ping",
42 "jabber:iq:version",
43 "http://jabber.org/protocol/chatstates",
44 Namespace.MDS_DISPLAYED + "+notify"
45 };
46 private final String[] MESSAGE_CONFIRMATION_FEATURES = {
47 "urn:xmpp:chat-markers:0", "urn:xmpp:receipts"
48 };
49 private final String[] MESSAGE_CORRECTION_FEATURES = {"urn:xmpp:message-correct:0"};
50 private final String[] PRIVACY_SENSITIVE = {
51 "urn:xmpp:time" // XEP-0202: Entity Time leaks time zone
52 };
53 private final String[] VOIP_NAMESPACES = {
54 Namespace.JINGLE_TRANSPORT_ICE_UDP,
55 Namespace.JINGLE_FEATURE_AUDIO,
56 Namespace.JINGLE_FEATURE_VIDEO,
57 Namespace.JINGLE_APPS_RTP,
58 Namespace.JINGLE_APPS_DTLS,
59 Namespace.JINGLE_MESSAGE
60 };
61 protected XmppConnectionService mXmppConnectionService;
62
63 AbstractGenerator(XmppConnectionService service) {
64 this.mXmppConnectionService = service;
65 }
66
67 public static String getTimestamp(long time) {
68 DATE_FORMAT.setTimeZone(TimeZone.getTimeZone("UTC"));
69 return DATE_FORMAT.format(time);
70 }
71
72 String getIdentityVersion() {
73 return BuildConfig.VERSION_NAME;
74 }
75
76 String getIdentityName() {
77 return BuildConfig.APP_NAME;
78 }
79
80 String getIdentityType() {
81 if ("chromium".equals(android.os.Build.BRAND)) {
82 return "pc";
83 } else {
84 return mXmppConnectionService.getString(R.string.default_resource).toLowerCase();
85 }
86 }
87
88 String getCapHash(final Account account) {
89 StringBuilder s = new StringBuilder();
90 s.append("client/")
91 .append(getIdentityType())
92 .append("//")
93 .append(getIdentityName())
94 .append('<');
95 MessageDigest md;
96 try {
97 md = MessageDigest.getInstance("SHA-1");
98 } catch (NoSuchAlgorithmException e) {
99 return null;
100 }
101
102 for (String feature : getFeatures(account)) {
103 s.append(feature).append('<');
104 }
105 final byte[] sha1 = md.digest(s.toString().getBytes());
106 return Base64.encodeToString(sha1, Base64.NO_WRAP);
107 }
108
109 public List<String> getFeatures(Account account) {
110 final XmppConnection connection = account.getXmppConnection();
111 final ArrayList<String> features = new ArrayList<>(Arrays.asList(FEATURES));
112 if (mXmppConnectionService.confirmMessages()) {
113 features.addAll(Arrays.asList(MESSAGE_CONFIRMATION_FEATURES));
114 }
115 if (mXmppConnectionService.allowMessageCorrection()) {
116 features.addAll(Arrays.asList(MESSAGE_CORRECTION_FEATURES));
117 }
118 if (Config.supportOmemo()) {
119 features.add(AxolotlService.PEP_DEVICE_LIST_NOTIFY);
120 }
121 if (!mXmppConnectionService.useTorToConnect() && !account.isOnion()) {
122 features.addAll(Arrays.asList(PRIVACY_SENSITIVE));
123 features.addAll(Arrays.asList(VOIP_NAMESPACES));
124 features.add(Namespace.JINGLE_TRANSPORT_WEBRTC_DATA_CHANNEL);
125 }
126 if (mXmppConnectionService.broadcastLastActivity()) {
127 features.add(Namespace.IDLE);
128 }
129 if (connection != null && connection.getFeatures().bookmarks2()) {
130 features.add(Namespace.BOOKMARKS2 + "+notify");
131 } else {
132 features.add(Namespace.BOOKMARKS + "+notify");
133 }
134
135 Collections.sort(features);
136 return features;
137 }
138}