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.Config;
16import eu.siacs.conversations.R;
17import eu.siacs.conversations.crypto.axolotl.AxolotlService;
18import eu.siacs.conversations.services.XmppConnectionService;
19import eu.siacs.conversations.utils.PhoneHelper;
20import eu.siacs.conversations.xmpp.jingle.stanzas.Content;
21
22public abstract class AbstractGenerator {
23 private final String[] FEATURES = {
24 "urn:xmpp:jingle:1",
25 Content.Version.FT_3.getNamespace(),
26 Content.Version.FT_4.getNamespace(),
27 "urn:xmpp:jingle:transports:s5b:1",
28 "urn:xmpp:jingle:transports:ibb:1",
29 "http://jabber.org/protocol/muc",
30 "jabber:x:conference",
31 "http://jabber.org/protocol/caps",
32 "http://jabber.org/protocol/disco#info",
33 "urn:xmpp:avatar:metadata+notify",
34 "http://jabber.org/protocol/nick+notify",
35 "urn:xmpp:ping",
36 "jabber:iq:version",
37 "http://jabber.org/protocol/chatstates"
38 };
39 private final String[] MESSAGE_CONFIRMATION_FEATURES = {
40 "urn:xmpp:chat-markers:0",
41 "urn:xmpp:receipts"
42 };
43 private final String[] MESSAGE_CORRECTION_FEATURES = {
44 "urn:xmpp:message-correct:0"
45 };
46 private final String[] PRIVACY_SENSITIVE = {
47 "urn:xmpp:time" //XEP-0202: Entity Time leaks time zone
48 };
49 private final String[] OTR = {
50 "urn:xmpp:otr:0"
51 };
52 private String mVersion = null;
53 protected final String IDENTITY_TYPE = "phone";
54
55 private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.US);
56
57 protected XmppConnectionService mXmppConnectionService;
58
59 protected AbstractGenerator(XmppConnectionService service) {
60 this.mXmppConnectionService = service;
61 }
62
63 protected String getIdentityVersion() {
64 if (mVersion == null) {
65 this.mVersion = PhoneHelper.getVersionName(mXmppConnectionService);
66 }
67 return this.mVersion;
68 }
69
70 public String getIdentityName() {
71 return mXmppConnectionService.getString(R.string.app_name) + " " + getIdentityVersion();
72 }
73
74 public String getCapHash() {
75 StringBuilder s = new StringBuilder();
76 s.append("client/" + IDENTITY_TYPE + "//" + getIdentityName() + "<");
77 MessageDigest md;
78 try {
79 md = MessageDigest.getInstance("SHA-1");
80 } catch (NoSuchAlgorithmException e) {
81 return null;
82 }
83
84 for (String feature : getFeatures()) {
85 s.append(feature + "<");
86 }
87 byte[] sha1 = md.digest(s.toString().getBytes());
88 return new String(Base64.encode(sha1, Base64.DEFAULT)).trim();
89 }
90
91 public static String getTimestamp(long time) {
92 DATE_FORMAT.setTimeZone(TimeZone.getTimeZone("UTC"));
93 return DATE_FORMAT.format(time);
94 }
95
96 public List<String> getFeatures() {
97 ArrayList<String> features = new ArrayList<>();
98 features.addAll(Arrays.asList(FEATURES));
99 if (mXmppConnectionService.confirmMessages()) {
100 features.addAll(Arrays.asList(MESSAGE_CONFIRMATION_FEATURES));
101 }
102 if (mXmppConnectionService.allowMessageCorrection()) {
103 features.addAll(Arrays.asList(MESSAGE_CORRECTION_FEATURES));
104 }
105 if (Config.supportOmemo()) {
106 features.add(AxolotlService.PEP_DEVICE_LIST_NOTIFY);
107 }
108 if (!mXmppConnectionService.useTorToConnect()) {
109 features.addAll(Arrays.asList(PRIVACY_SENSITIVE));
110 }
111 if (Config.supportOtr()) {
112 features.addAll(Arrays.asList(OTR));
113 }
114 Collections.sort(features);
115 return features;
116 }
117}