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[] STATIC_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 };
45 private final String[] MESSAGE_CONFIRMATION_FEATURES = {
46 "urn:xmpp:chat-markers:0", "urn:xmpp:receipts"
47 };
48 private final String[] MESSAGE_CORRECTION_FEATURES = {"urn:xmpp:message-correct:0"};
49 private final String[] PRIVACY_SENSITIVE = {
50 "urn:xmpp:time" // XEP-0202: Entity Time leaks time zone
51 };
52 private final String[] VOIP_NAMESPACES = {
53 Namespace.JINGLE_TRANSPORT_ICE_UDP,
54 Namespace.JINGLE_FEATURE_AUDIO,
55 Namespace.JINGLE_FEATURE_VIDEO,
56 Namespace.JINGLE_APPS_RTP,
57 Namespace.JINGLE_APPS_DTLS,
58 Namespace.JINGLE_MESSAGE
59 };
60 protected XmppConnectionService mXmppConnectionService;
61
62 AbstractGenerator(XmppConnectionService service) {
63 this.mXmppConnectionService = service;
64 }
65
66 public static String getTimestamp(long time) {
67 DATE_FORMAT.setTimeZone(TimeZone.getTimeZone("UTC"));
68 return DATE_FORMAT.format(time);
69 }
70
71 String getIdentityVersion() {
72 return BuildConfig.VERSION_NAME;
73 }
74
75 String getIdentityName() {
76 return BuildConfig.APP_NAME;
77 }
78
79 String getIdentityType() {
80 if ("chromium".equals(android.os.Build.BRAND)) {
81 return "pc";
82 } else {
83 return mXmppConnectionService.getString(R.string.default_resource).toLowerCase();
84 }
85 }
86
87 String getCapHash(final Account account) {
88 StringBuilder s = new StringBuilder();
89 s.append("client/")
90 .append(getIdentityType())
91 .append("//")
92 .append(getIdentityName())
93 .append('<');
94 MessageDigest md;
95 try {
96 md = MessageDigest.getInstance("SHA-1");
97 } catch (NoSuchAlgorithmException e) {
98 return null;
99 }
100
101 for (String feature : getFeatures(account)) {
102 s.append(feature).append('<');
103 }
104 final byte[] sha1 = md.digest(s.toString().getBytes());
105 return Base64.encodeToString(sha1, Base64.NO_WRAP);
106 }
107
108 public List<String> getFeatures(final Account account) {
109 final XmppConnection connection = account.getXmppConnection();
110 final ArrayList<String> features = new ArrayList<>(Arrays.asList(STATIC_FEATURES));
111 features.add("http://jabber.org/protocol/xhtml-im");
112 features.add("urn:xmpp:bob");
113 if (Config.MESSAGE_DISPLAYED_SYNCHRONIZATION) {
114 features.add(Namespace.MDS_DISPLAYED + "+notify");
115 }
116 if (mXmppConnectionService.confirmMessages()) {
117 features.addAll(Arrays.asList(MESSAGE_CONFIRMATION_FEATURES));
118 }
119 if (mXmppConnectionService.allowMessageCorrection()) {
120 features.addAll(Arrays.asList(MESSAGE_CORRECTION_FEATURES));
121 }
122 if (Config.supportOmemo()) {
123 features.add(AxolotlService.PEP_DEVICE_LIST_NOTIFY);
124 }
125 if (!mXmppConnectionService.useTorToConnect() && !account.isOnion()) {
126 features.addAll(Arrays.asList(PRIVACY_SENSITIVE));
127 features.addAll(Arrays.asList(VOIP_NAMESPACES));
128 features.add(Namespace.JINGLE_TRANSPORT_WEBRTC_DATA_CHANNEL);
129 }
130 if (mXmppConnectionService.broadcastLastActivity()) {
131 features.add(Namespace.IDLE);
132 }
133 if (connection != null && connection.getFeatures().bookmarks2()) {
134 features.add(Namespace.BOOKMARKS2 + "+notify");
135 } else {
136 features.add(Namespace.BOOKMARKS + "+notify");
137 }
138
139 Collections.sort(features);
140 return features;
141 }
142}