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
54 private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.US);
55
56 protected XmppConnectionService mXmppConnectionService;
57
58 protected AbstractGenerator(XmppConnectionService service) {
59 this.mXmppConnectionService = service;
60 }
61
62 protected String getIdentityVersion() {
63 if (mVersion == null) {
64 this.mVersion = PhoneHelper.getVersionName(mXmppConnectionService);
65 }
66 return this.mVersion;
67 }
68
69 public String getIdentityName() {
70 return mXmppConnectionService.getString(R.string.app_name) + " " + getIdentityVersion();
71 }
72
73 public String getIdentityType() {
74 if ("chromium".equals(android.os.Build.BRAND)) {
75 return "pc";
76 } else {
77 return mXmppConnectionService.getString(R.string.default_resource).toLowerCase();
78 }
79 }
80
81 public String getCapHash() {
82 StringBuilder s = new StringBuilder();
83 s.append("client/" + getIdentityType() + "//" + getIdentityName() + "<");
84 MessageDigest md;
85 try {
86 md = MessageDigest.getInstance("SHA-1");
87 } catch (NoSuchAlgorithmException e) {
88 return null;
89 }
90
91 for (String feature : getFeatures()) {
92 s.append(feature + "<");
93 }
94 byte[] sha1 = md.digest(s.toString().getBytes());
95 return new String(Base64.encode(sha1, Base64.DEFAULT)).trim();
96 }
97
98 public static String getTimestamp(long time) {
99 DATE_FORMAT.setTimeZone(TimeZone.getTimeZone("UTC"));
100 return DATE_FORMAT.format(time);
101 }
102
103 public List<String> getFeatures() {
104 ArrayList<String> features = new ArrayList<>();
105 features.addAll(Arrays.asList(FEATURES));
106 if (mXmppConnectionService.confirmMessages()) {
107 features.addAll(Arrays.asList(MESSAGE_CONFIRMATION_FEATURES));
108 }
109 if (mXmppConnectionService.allowMessageCorrection()) {
110 features.addAll(Arrays.asList(MESSAGE_CORRECTION_FEATURES));
111 }
112 if (Config.supportOmemo()) {
113 features.add(AxolotlService.PEP_DEVICE_LIST_NOTIFY);
114 }
115 if (!mXmppConnectionService.useTorToConnect()) {
116 features.addAll(Arrays.asList(PRIVACY_SENSITIVE));
117 }
118 if (Config.supportOtr()) {
119 features.addAll(Arrays.asList(OTR));
120 }
121 Collections.sort(features);
122 return features;
123 }
124}