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.xml.Namespace;
21import eu.siacs.conversations.xmpp.jingle.stanzas.Content;
22
23public abstract class AbstractGenerator {
24 private final String[] FEATURES = {
25 "urn:xmpp:jingle:1",
26 Content.Version.FT_3.getNamespace(),
27 Content.Version.FT_4.getNamespace(),
28 "urn:xmpp:jingle:transports:s5b:1",
29 "urn:xmpp:jingle:transports:ibb:1",
30 "http://jabber.org/protocol/muc",
31 "jabber:x:conference",
32 "http://jabber.org/protocol/caps",
33 "http://jabber.org/protocol/disco#info",
34 "urn:xmpp:avatar:metadata+notify",
35 "http://jabber.org/protocol/nick+notify",
36 "urn:xmpp:ping",
37 "jabber:iq:version",
38 "http://jabber.org/protocol/chatstates"
39 };
40 private final String[] MESSAGE_CONFIRMATION_FEATURES = {
41 "urn:xmpp:chat-markers:0",
42 "urn:xmpp:receipts"
43 };
44 private final String[] MESSAGE_CORRECTION_FEATURES = {
45 "urn:xmpp:message-correct:0"
46 };
47 private final String[] PRIVACY_SENSITIVE = {
48 "urn:xmpp:time" //XEP-0202: Entity Time leaks time zone
49 };
50 private final String[] OTR = {
51 "urn:xmpp:otr:0"
52 };
53 private String mVersion = null;
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 getIdentityType() {
75 if ("chromium".equals(android.os.Build.BRAND)) {
76 return "pc";
77 } else {
78 return mXmppConnectionService.getString(R.string.default_resource).toLowerCase();
79 }
80 }
81
82 public String getCapHash() {
83 StringBuilder s = new StringBuilder();
84 s.append("client/" + getIdentityType() + "//" + getIdentityName() + "<");
85 MessageDigest md;
86 try {
87 md = MessageDigest.getInstance("SHA-1");
88 } catch (NoSuchAlgorithmException e) {
89 return null;
90 }
91
92 for (String feature : getFeatures()) {
93 s.append(feature + "<");
94 }
95 byte[] sha1 = md.digest(s.toString().getBytes());
96 return new String(Base64.encode(sha1, Base64.DEFAULT)).trim();
97 }
98
99 public static String getTimestamp(long time) {
100 DATE_FORMAT.setTimeZone(TimeZone.getTimeZone("UTC"));
101 return DATE_FORMAT.format(time);
102 }
103
104 public List<String> getFeatures() {
105 ArrayList<String> features = new ArrayList<>();
106 features.addAll(Arrays.asList(FEATURES));
107 if (mXmppConnectionService.confirmMessages()) {
108 features.addAll(Arrays.asList(MESSAGE_CONFIRMATION_FEATURES));
109 }
110 if (mXmppConnectionService.allowMessageCorrection()) {
111 features.addAll(Arrays.asList(MESSAGE_CORRECTION_FEATURES));
112 }
113 if (Config.supportOmemo()) {
114 features.add(AxolotlService.PEP_DEVICE_LIST_NOTIFY);
115 }
116 if (!mXmppConnectionService.useTorToConnect()) {
117 features.addAll(Arrays.asList(PRIVACY_SENSITIVE));
118 }
119 if (Config.supportOtr()) {
120 features.addAll(Arrays.asList(OTR));
121 }
122 if (mXmppConnectionService.broadcastLastActivity()) {
123 features.add(Namespace.IDLE);
124 }
125 Collections.sort(features);
126 return features;
127 }
128}