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