1package eu.siacs.conversations.generator;
2
3import net.java.otr4j.OtrException;
4import net.java.otr4j.session.Session;
5
6import java.text.SimpleDateFormat;
7import java.util.ArrayList;
8import java.util.Date;
9import java.util.Locale;
10import java.util.TimeZone;
11
12import eu.siacs.conversations.Config;
13import eu.siacs.conversations.crypto.axolotl.AxolotlService;
14import eu.siacs.conversations.crypto.axolotl.XmppAxolotlMessage;
15import eu.siacs.conversations.entities.Account;
16import eu.siacs.conversations.entities.Contact;
17import eu.siacs.conversations.entities.Conversation;
18import eu.siacs.conversations.entities.Message;
19import eu.siacs.conversations.services.XmppConnectionService;
20import eu.siacs.conversations.xml.Element;
21import eu.siacs.conversations.xml.Namespace;
22import eu.siacs.conversations.xmpp.chatstate.ChatState;
23import eu.siacs.conversations.xmpp.jid.Jid;
24import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
25
26public class MessageGenerator extends AbstractGenerator {
27 public static final String OTR_FALLBACK_MESSAGE = "I would like to start a private (OTR encrypted) conversation but your client doesn’t seem to support that";
28 private static final String OMEMO_FALLBACK_MESSAGE = "I sent you an OMEMO encrypted message but your client doesn’t seem to support that. Find more information on https://conversations.im/omemo";
29 private static final String PGP_FALLBACK_MESSAGE = "I sent you a PGP encrypted message but your client doesn’t seem to support that.";
30
31 public MessageGenerator(XmppConnectionService service) {
32 super(service);
33 }
34
35 private MessagePacket preparePacket(Message message) {
36 Conversation conversation = message.getConversation();
37 Account account = conversation.getAccount();
38 MessagePacket packet = new MessagePacket();
39 if (conversation.getMode() == Conversation.MODE_SINGLE) {
40 packet.setTo(message.getCounterpart());
41 packet.setType(MessagePacket.TYPE_CHAT);
42 if (this.mXmppConnectionService.indicateReceived()) {
43 packet.addChild("request", "urn:xmpp:receipts");
44 }
45 } else if (message.getType() == Message.TYPE_PRIVATE) {
46 packet.setTo(message.getCounterpart());
47 packet.setType(MessagePacket.TYPE_CHAT);
48 packet.addChild("x","http://jabber.org/protocol/muc#user");
49 if (this.mXmppConnectionService.indicateReceived()) {
50 packet.addChild("request", "urn:xmpp:receipts");
51 }
52 } else {
53 packet.setTo(message.getCounterpart().toBareJid());
54 packet.setType(MessagePacket.TYPE_GROUPCHAT);
55 }
56 if (conversation.getMode() == Conversation.MODE_SINGLE ||
57 (conversation.getMucOptions().nonanonymous() && conversation.getMucOptions().membersOnly() && message.getType() != Message.TYPE_PRIVATE)) {
58 packet.addChild("markable", "urn:xmpp:chat-markers:0");
59 }
60 packet.setFrom(account.getJid());
61 packet.setId(message.getUuid());
62 packet.addChild("origin-id", Namespace.STANZA_IDS).setAttribute("id",message.getUuid());
63 if (message.edited()) {
64 packet.addChild("replace","urn:xmpp:message-correct:0").setAttribute("id",message.getEditedId());
65 }
66 return packet;
67 }
68
69 public void addDelay(MessagePacket packet, long timestamp) {
70 final SimpleDateFormat mDateFormat = new SimpleDateFormat(
71 "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.US);
72 mDateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
73 Element delay = packet.addChild("delay", "urn:xmpp:delay");
74 Date date = new Date(timestamp);
75 delay.setAttribute("stamp", mDateFormat.format(date));
76 }
77
78 public MessagePacket generateAxolotlChat(Message message, XmppAxolotlMessage axolotlMessage) {
79 MessagePacket packet = preparePacket(message);
80 if (axolotlMessage == null) {
81 return null;
82 }
83 packet.setAxolotlMessage(axolotlMessage.toElement());
84 if (Config.supportUnencrypted() && !recipientSupportsOmemo(message)) {
85 packet.setBody(OMEMO_FALLBACK_MESSAGE);
86 }
87 packet.addChild("store", "urn:xmpp:hints");
88 packet.addChild("encryption","urn:xmpp:eme:0")
89 .setAttribute("name","OMEMO")
90 .setAttribute("namespace",AxolotlService.PEP_PREFIX);
91 return packet;
92 }
93
94 public MessagePacket generateKeyTransportMessage(Jid to, XmppAxolotlMessage axolotlMessage) {
95 MessagePacket packet = new MessagePacket();
96 packet.setType(MessagePacket.TYPE_CHAT);
97 packet.setTo(to);
98 packet.setAxolotlMessage(axolotlMessage.toElement());
99 packet.addChild("store", "urn:xmpp:hints");
100 return packet;
101 }
102
103 private static boolean recipientSupportsOmemo(Message message) {
104 Contact c = message.getContact();
105 return c != null && c.getPresences().allOrNonSupport(AxolotlService.PEP_DEVICE_LIST_NOTIFY);
106 }
107
108 public static void addMessageHints(MessagePacket packet) {
109 packet.addChild("private", "urn:xmpp:carbons:2");
110 packet.addChild("no-copy", "urn:xmpp:hints");
111 packet.addChild("no-permanent-store", "urn:xmpp:hints");
112 packet.addChild("no-permanent-storage", "urn:xmpp:hints"); //do not copy this. this is wrong. it is *store*
113 }
114
115 public MessagePacket generateOtrChat(Message message) {
116 Session otrSession = message.getConversation().getOtrSession();
117 if (otrSession == null) {
118 return null;
119 }
120 MessagePacket packet = preparePacket(message);
121 addMessageHints(packet);
122 try {
123 String content;
124 if (message.hasFileOnRemoteHost()) {
125 content = message.getFileParams().url.toString();
126 } else {
127 content = message.getBody();
128 }
129 packet.setBody(otrSession.transformSending(content)[0]);
130 packet.addChild("encryption","urn:xmpp:eme:0")
131 .setAttribute("namespace","urn:xmpp:otr:0");
132 return packet;
133 } catch (OtrException e) {
134 return null;
135 }
136 }
137
138 public MessagePacket generateChat(Message message) {
139 MessagePacket packet = preparePacket(message);
140 String content;
141 if (message.hasFileOnRemoteHost()) {
142 Message.FileParams fileParams = message.getFileParams();
143 content = fileParams.url.toString();
144 packet.addChild("x",Namespace.OOB).addChild("url").setContent(content);
145 } else {
146 content = message.getBody();
147 }
148 packet.setBody(content);
149 return packet;
150 }
151
152 public MessagePacket generatePgpChat(Message message) {
153 MessagePacket packet = preparePacket(message);
154 if (message.hasFileOnRemoteHost()) {
155 final String url = message.getFileParams().url.toString();
156 packet.setBody(url);
157 packet.addChild("x",Namespace.OOB).addChild("url").setContent(url);
158 } else {
159 if (Config.supportUnencrypted()) {
160 packet.setBody(PGP_FALLBACK_MESSAGE);
161 }
162 if (message.getEncryption() == Message.ENCRYPTION_DECRYPTED) {
163 packet.addChild("x", "jabber:x:encrypted").setContent(message.getEncryptedBody());
164 } else if (message.getEncryption() == Message.ENCRYPTION_PGP) {
165 packet.addChild("x", "jabber:x:encrypted").setContent(message.getBody());
166 }
167 packet.addChild("encryption", "urn:xmpp:eme:0")
168 .setAttribute("namespace", "jabber:x:encrypted");
169 }
170 return packet;
171 }
172
173 public MessagePacket generateChatState(Conversation conversation) {
174 final Account account = conversation.getAccount();
175 MessagePacket packet = new MessagePacket();
176 packet.setType(conversation.getMode() == Conversation.MODE_MULTI ? MessagePacket.TYPE_GROUPCHAT : MessagePacket.TYPE_CHAT);
177 packet.setTo(conversation.getJid().toBareJid());
178 packet.setFrom(account.getJid());
179 packet.addChild(ChatState.toElement(conversation.getOutgoingChatState()));
180 packet.addChild("no-store", "urn:xmpp:hints");
181 packet.addChild("no-storage", "urn:xmpp:hints"); //wrong! don't copy this. Its *store*
182 return packet;
183 }
184
185 public MessagePacket confirm(final Account account, final Jid to, final String id, final Jid counterpart, final boolean groupChat) {
186 MessagePacket packet = new MessagePacket();
187 packet.setType(groupChat ? MessagePacket.TYPE_GROUPCHAT : MessagePacket.TYPE_CHAT);
188 packet.setTo(groupChat ? to.toBareJid() : to);
189 packet.setFrom(account.getJid());
190 Element displayed = packet.addChild("displayed","urn:xmpp:chat-markers:0");
191 displayed.setAttribute("id", id);
192 if (groupChat && counterpart != null) {
193 displayed.setAttribute("sender",counterpart.toPreppedString());
194 }
195 packet.addChild("store", "urn:xmpp:hints");
196 return packet;
197 }
198
199 public MessagePacket conferenceSubject(Conversation conversation,String subject) {
200 MessagePacket packet = new MessagePacket();
201 packet.setType(MessagePacket.TYPE_GROUPCHAT);
202 packet.setTo(conversation.getJid().toBareJid());
203 Element subjectChild = new Element("subject");
204 subjectChild.setContent(subject);
205 packet.addChild(subjectChild);
206 packet.setFrom(conversation.getAccount().getJid().toBareJid());
207 return packet;
208 }
209
210 public MessagePacket directInvite(final Conversation conversation, final Jid contact) {
211 MessagePacket packet = new MessagePacket();
212 packet.setType(MessagePacket.TYPE_NORMAL);
213 packet.setTo(contact);
214 packet.setFrom(conversation.getAccount().getJid());
215 Element x = packet.addChild("x", "jabber:x:conference");
216 x.setAttribute("jid", conversation.getJid().toBareJid().toString());
217 String password = conversation.getMucOptions().getPassword();
218 if (password != null) {
219 x.setAttribute("password",password);
220 }
221 return packet;
222 }
223
224 public MessagePacket invite(Conversation conversation, Jid contact) {
225 MessagePacket packet = new MessagePacket();
226 packet.setTo(conversation.getJid().toBareJid());
227 packet.setFrom(conversation.getAccount().getJid());
228 Element x = new Element("x");
229 x.setAttribute("xmlns", "http://jabber.org/protocol/muc#user");
230 Element invite = new Element("invite");
231 invite.setAttribute("to", contact.toBareJid().toString());
232 x.addChild(invite);
233 packet.addChild(x);
234 return packet;
235 }
236
237 public MessagePacket received(Account account, MessagePacket originalMessage, ArrayList<String> namespaces, int type) {
238 MessagePacket receivedPacket = new MessagePacket();
239 receivedPacket.setType(type);
240 receivedPacket.setTo(originalMessage.getFrom());
241 receivedPacket.setFrom(account.getJid());
242 for(String namespace : namespaces) {
243 receivedPacket.addChild("received", namespace).setAttribute("id", originalMessage.getId());
244 }
245 return receivedPacket;
246 }
247
248 public MessagePacket generateOtrError(Jid to, String id, String errorText) {
249 MessagePacket packet = new MessagePacket();
250 packet.setType(MessagePacket.TYPE_ERROR);
251 packet.setAttribute("id",id);
252 packet.setTo(to);
253 Element error = packet.addChild("error");
254 error.setAttribute("code","406");
255 error.setAttribute("type","modify");
256 error.addChild("not-acceptable","urn:ietf:params:xml:ns:xmpp-stanzas");
257 error.addChild("text").setContent("?OTR Error:" + errorText);
258 return packet;
259 }
260}