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.isSingleOrPrivateAndNonAnonymous() && message.getType() != Message.TYPE_PRIVATE) {
57 packet.addChild("markable", "urn:xmpp:chat-markers:0");
58 }
59 packet.setFrom(account.getJid());
60 packet.setId(message.getUuid());
61 packet.addChild("origin-id", Namespace.STANZA_IDS).setAttribute("id",message.getUuid());
62 if (message.edited()) {
63 packet.addChild("replace","urn:xmpp:message-correct:0").setAttribute("id",message.getEditedId());
64 }
65 return packet;
66 }
67
68 public void addDelay(MessagePacket packet, long timestamp) {
69 final SimpleDateFormat mDateFormat = new SimpleDateFormat(
70 "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.US);
71 mDateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
72 Element delay = packet.addChild("delay", "urn:xmpp:delay");
73 Date date = new Date(timestamp);
74 delay.setAttribute("stamp", mDateFormat.format(date));
75 }
76
77 public MessagePacket generateAxolotlChat(Message message, XmppAxolotlMessage axolotlMessage) {
78 MessagePacket packet = preparePacket(message);
79 if (axolotlMessage == null) {
80 return null;
81 }
82 packet.setAxolotlMessage(axolotlMessage.toElement());
83 if (Config.supportUnencrypted() && !recipientSupportsOmemo(message)) {
84 packet.setBody(OMEMO_FALLBACK_MESSAGE);
85 }
86 packet.addChild("store", "urn:xmpp:hints");
87 packet.addChild("encryption","urn:xmpp:eme:0")
88 .setAttribute("name","OMEMO")
89 .setAttribute("namespace",AxolotlService.PEP_PREFIX);
90 return packet;
91 }
92
93 public MessagePacket generateKeyTransportMessage(Jid to, XmppAxolotlMessage axolotlMessage) {
94 MessagePacket packet = new MessagePacket();
95 packet.setType(MessagePacket.TYPE_CHAT);
96 packet.setTo(to);
97 packet.setAxolotlMessage(axolotlMessage.toElement());
98 packet.addChild("store", "urn:xmpp:hints");
99 return packet;
100 }
101
102 private static boolean recipientSupportsOmemo(Message message) {
103 Contact c = message.getContact();
104 return c != null && c.getPresences().allOrNonSupport(AxolotlService.PEP_DEVICE_LIST_NOTIFY);
105 }
106
107 public static void addMessageHints(MessagePacket packet) {
108 packet.addChild("private", "urn:xmpp:carbons:2");
109 packet.addChild("no-copy", "urn:xmpp:hints");
110 packet.addChild("no-permanent-store", "urn:xmpp:hints");
111 packet.addChild("no-permanent-storage", "urn:xmpp:hints"); //do not copy this. this is wrong. it is *store*
112 }
113
114 public MessagePacket generateOtrChat(Message message) {
115 Session otrSession = message.getConversation().getOtrSession();
116 if (otrSession == null) {
117 return null;
118 }
119 MessagePacket packet = preparePacket(message);
120 addMessageHints(packet);
121 try {
122 String content;
123 if (message.hasFileOnRemoteHost()) {
124 content = message.getFileParams().url.toString();
125 } else {
126 content = message.getBody();
127 }
128 packet.setBody(otrSession.transformSending(content)[0]);
129 packet.addChild("encryption","urn:xmpp:eme:0")
130 .setAttribute("namespace","urn:xmpp:otr:0");
131 return packet;
132 } catch (OtrException e) {
133 return null;
134 }
135 }
136
137 public MessagePacket generateChat(Message message) {
138 MessagePacket packet = preparePacket(message);
139 String content;
140 if (message.hasFileOnRemoteHost()) {
141 Message.FileParams fileParams = message.getFileParams();
142 content = fileParams.url.toString();
143 packet.addChild("x",Namespace.OOB).addChild("url").setContent(content);
144 } else {
145 content = message.getBody();
146 }
147 packet.setBody(content);
148 return packet;
149 }
150
151 public MessagePacket generatePgpChat(Message message) {
152 MessagePacket packet = preparePacket(message);
153 if (message.hasFileOnRemoteHost()) {
154 final String url = message.getFileParams().url.toString();
155 packet.setBody(url);
156 packet.addChild("x",Namespace.OOB).addChild("url").setContent(url);
157 } else {
158 if (Config.supportUnencrypted()) {
159 packet.setBody(PGP_FALLBACK_MESSAGE);
160 }
161 if (message.getEncryption() == Message.ENCRYPTION_DECRYPTED) {
162 packet.addChild("x", "jabber:x:encrypted").setContent(message.getEncryptedBody());
163 } else if (message.getEncryption() == Message.ENCRYPTION_PGP) {
164 packet.addChild("x", "jabber:x:encrypted").setContent(message.getBody());
165 }
166 packet.addChild("encryption", "urn:xmpp:eme:0")
167 .setAttribute("namespace", "jabber:x:encrypted");
168 }
169 return packet;
170 }
171
172 public MessagePacket generateChatState(Conversation conversation) {
173 final Account account = conversation.getAccount();
174 MessagePacket packet = new MessagePacket();
175 packet.setType(conversation.getMode() == Conversation.MODE_MULTI ? MessagePacket.TYPE_GROUPCHAT : MessagePacket.TYPE_CHAT);
176 packet.setTo(conversation.getJid().toBareJid());
177 packet.setFrom(account.getJid());
178 packet.addChild(ChatState.toElement(conversation.getOutgoingChatState()));
179 packet.addChild("no-store", "urn:xmpp:hints");
180 packet.addChild("no-storage", "urn:xmpp:hints"); //wrong! don't copy this. Its *store*
181 return packet;
182 }
183
184 public MessagePacket confirm(final Account account, final Jid to, final String id, final Jid counterpart, final boolean groupChat) {
185 MessagePacket packet = new MessagePacket();
186 packet.setType(groupChat ? MessagePacket.TYPE_GROUPCHAT : MessagePacket.TYPE_CHAT);
187 packet.setTo(groupChat ? to.toBareJid() : to);
188 packet.setFrom(account.getJid());
189 Element displayed = packet.addChild("displayed","urn:xmpp:chat-markers:0");
190 displayed.setAttribute("id", id);
191 if (groupChat && counterpart != null) {
192 displayed.setAttribute("sender",counterpart.toPreppedString());
193 }
194 packet.addChild("store", "urn:xmpp:hints");
195 return packet;
196 }
197
198 public MessagePacket conferenceSubject(Conversation conversation,String subject) {
199 MessagePacket packet = new MessagePacket();
200 packet.setType(MessagePacket.TYPE_GROUPCHAT);
201 packet.setTo(conversation.getJid().toBareJid());
202 Element subjectChild = new Element("subject");
203 subjectChild.setContent(subject);
204 packet.addChild(subjectChild);
205 packet.setFrom(conversation.getAccount().getJid().toBareJid());
206 return packet;
207 }
208
209 public MessagePacket directInvite(final Conversation conversation, final Jid contact) {
210 MessagePacket packet = new MessagePacket();
211 packet.setType(MessagePacket.TYPE_NORMAL);
212 packet.setTo(contact);
213 packet.setFrom(conversation.getAccount().getJid());
214 Element x = packet.addChild("x", "jabber:x:conference");
215 x.setAttribute("jid", conversation.getJid().toBareJid().toString());
216 String password = conversation.getMucOptions().getPassword();
217 if (password != null) {
218 x.setAttribute("password",password);
219 }
220 return packet;
221 }
222
223 public MessagePacket invite(Conversation conversation, Jid contact) {
224 MessagePacket packet = new MessagePacket();
225 packet.setTo(conversation.getJid().toBareJid());
226 packet.setFrom(conversation.getAccount().getJid());
227 Element x = new Element("x");
228 x.setAttribute("xmlns", "http://jabber.org/protocol/muc#user");
229 Element invite = new Element("invite");
230 invite.setAttribute("to", contact.toBareJid().toString());
231 x.addChild(invite);
232 packet.addChild(x);
233 return packet;
234 }
235
236 public MessagePacket received(Account account, MessagePacket originalMessage, ArrayList<String> namespaces, int type) {
237 MessagePacket receivedPacket = new MessagePacket();
238 receivedPacket.setType(type);
239 receivedPacket.setTo(originalMessage.getFrom());
240 receivedPacket.setFrom(account.getJid());
241 for(String namespace : namespaces) {
242 receivedPacket.addChild("received", namespace).setAttribute("id", originalMessage.getId());
243 }
244 receivedPacket.addChild("store", "urn:xmpp:hints");
245 return receivedPacket;
246 }
247
248 public MessagePacket received(Account account, Jid to, String id) {
249 MessagePacket packet = new MessagePacket();
250 packet.setFrom(account.getJid());
251 packet.setTo(to);
252 packet.addChild("received","urn:xmpp:receipts").setAttribute("id",id);
253 packet.addChild("store", "urn:xmpp:hints");
254 return packet;
255 }
256
257 public MessagePacket generateOtrError(Jid to, String id, String errorText) {
258 MessagePacket packet = new MessagePacket();
259 packet.setType(MessagePacket.TYPE_ERROR);
260 packet.setAttribute("id",id);
261 packet.setTo(to);
262 Element error = packet.addChild("error");
263 error.setAttribute("code","406");
264 error.setAttribute("type","modify");
265 error.addChild("not-acceptable","urn:ietf:params:xml:ns:xmpp-stanzas");
266 error.addChild("text").setContent("?OTR Error:" + errorText);
267 return packet;
268 }
269}