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 packet.addChild("markable", "urn:xmpp:chat-markers:0");
43 if (this.mXmppConnectionService.indicateReceived()) {
44 packet.addChild("request", "urn:xmpp:receipts");
45 }
46 } else if (message.getType() == Message.TYPE_PRIVATE) {
47 packet.setTo(message.getCounterpart());
48 packet.setType(MessagePacket.TYPE_CHAT);
49 packet.addChild("x","http://jabber.org/protocol/muc#user");
50 if (this.mXmppConnectionService.indicateReceived()) {
51 packet.addChild("request", "urn:xmpp:receipts");
52 }
53 } else {
54 packet.setTo(message.getCounterpart().toBareJid());
55 packet.setType(MessagePacket.TYPE_GROUPCHAT);
56 }
57 packet.setFrom(account.getJid());
58 packet.setId(message.getUuid());
59 packet.addChild("origin-id", Namespace.STANZA_IDS).setAttribute("id",message.getUuid());
60 if (message.edited()) {
61 packet.addChild("replace","urn:xmpp:message-correct:0").setAttribute("id",message.getEditedId());
62 }
63 return packet;
64 }
65
66 public void addDelay(MessagePacket packet, long timestamp) {
67 final SimpleDateFormat mDateFormat = new SimpleDateFormat(
68 "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.US);
69 mDateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
70 Element delay = packet.addChild("delay", "urn:xmpp:delay");
71 Date date = new Date(timestamp);
72 delay.setAttribute("stamp", mDateFormat.format(date));
73 }
74
75 public MessagePacket generateAxolotlChat(Message message, XmppAxolotlMessage axolotlMessage) {
76 MessagePacket packet = preparePacket(message);
77 if (axolotlMessage == null) {
78 return null;
79 }
80 packet.setAxolotlMessage(axolotlMessage.toElement());
81 if (Config.supportUnencrypted() && !recipientSupportsOmemo(message)) {
82 packet.setBody(OMEMO_FALLBACK_MESSAGE);
83 }
84 packet.addChild("store", "urn:xmpp:hints");
85 packet.addChild("encryption","urn:xmpp:eme:0")
86 .setAttribute("name","OMEMO")
87 .setAttribute("namespace",AxolotlService.PEP_PREFIX);
88 return packet;
89 }
90
91 private static boolean recipientSupportsOmemo(Message message) {
92 Contact c = message.getContact();
93 return c != null && c.getPresences().allOrNonSupport(AxolotlService.PEP_DEVICE_LIST_NOTIFY);
94 }
95
96 public static void addMessageHints(MessagePacket packet) {
97 packet.addChild("private", "urn:xmpp:carbons:2");
98 packet.addChild("no-copy", "urn:xmpp:hints");
99 packet.addChild("no-permanent-store", "urn:xmpp:hints");
100 packet.addChild("no-permanent-storage", "urn:xmpp:hints"); //do not copy this. this is wrong. it is *store*
101 }
102
103 public MessagePacket generateOtrChat(Message message) {
104 Session otrSession = message.getConversation().getOtrSession();
105 if (otrSession == null) {
106 return null;
107 }
108 MessagePacket packet = preparePacket(message);
109 addMessageHints(packet);
110 try {
111 String content;
112 if (message.hasFileOnRemoteHost()) {
113 content = message.getFileParams().url.toString();
114 } else {
115 content = message.getBody();
116 }
117 packet.setBody(otrSession.transformSending(content)[0]);
118 packet.addChild("encryption","urn:xmpp:eme:0")
119 .setAttribute("namespace","urn:xmpp:otr:0");
120 return packet;
121 } catch (OtrException e) {
122 return null;
123 }
124 }
125
126 public MessagePacket generateChat(Message message) {
127 MessagePacket packet = preparePacket(message);
128 String content;
129 if (message.hasFileOnRemoteHost()) {
130 Message.FileParams fileParams = message.getFileParams();
131 content = fileParams.url.toString();
132 packet.addChild("x","jabber:x:oob").addChild("url").setContent(content);
133 } else {
134 content = message.getBody();
135 }
136 packet.setBody(content);
137 return packet;
138 }
139
140 public MessagePacket generatePgpChat(Message message) {
141 MessagePacket packet = preparePacket(message);
142 if (Config.supportUnencrypted()) {
143 packet.setBody(PGP_FALLBACK_MESSAGE);
144 }
145 if (message.getEncryption() == Message.ENCRYPTION_DECRYPTED) {
146 packet.addChild("x", "jabber:x:encrypted").setContent(message.getEncryptedBody());
147 } else if (message.getEncryption() == Message.ENCRYPTION_PGP) {
148 packet.addChild("x", "jabber:x:encrypted").setContent(message.getBody());
149 }
150 packet.addChild("encryption","urn:xmpp:eme:0")
151 .setAttribute("namespace","jabber:x:encrypted");
152 return packet;
153 }
154
155 public MessagePacket generateChatState(Conversation conversation) {
156 final Account account = conversation.getAccount();
157 MessagePacket packet = new MessagePacket();
158 packet.setType(conversation.getMode() == Conversation.MODE_MULTI ? MessagePacket.TYPE_GROUPCHAT : MessagePacket.TYPE_CHAT);
159 packet.setTo(conversation.getJid().toBareJid());
160 packet.setFrom(account.getJid());
161 packet.addChild(ChatState.toElement(conversation.getOutgoingChatState()));
162 packet.addChild("no-store", "urn:xmpp:hints");
163 packet.addChild("no-storage", "urn:xmpp:hints"); //wrong! don't copy this. Its *store*
164 return packet;
165 }
166
167 public MessagePacket confirm(final Account account, final Jid to, final String id) {
168 MessagePacket packet = new MessagePacket();
169 packet.setType(MessagePacket.TYPE_CHAT);
170 packet.setTo(to);
171 packet.setFrom(account.getJid());
172 Element received = packet.addChild("displayed","urn:xmpp:chat-markers:0");
173 received.setAttribute("id", id);
174 packet.addChild("store", "urn:xmpp:hints");
175 return packet;
176 }
177
178 public MessagePacket conferenceSubject(Conversation conversation,String subject) {
179 MessagePacket packet = new MessagePacket();
180 packet.setType(MessagePacket.TYPE_GROUPCHAT);
181 packet.setTo(conversation.getJid().toBareJid());
182 Element subjectChild = new Element("subject");
183 subjectChild.setContent(subject);
184 packet.addChild(subjectChild);
185 packet.setFrom(conversation.getAccount().getJid().toBareJid());
186 return packet;
187 }
188
189 public MessagePacket directInvite(final Conversation conversation, final Jid contact) {
190 MessagePacket packet = new MessagePacket();
191 packet.setType(MessagePacket.TYPE_NORMAL);
192 packet.setTo(contact);
193 packet.setFrom(conversation.getAccount().getJid());
194 Element x = packet.addChild("x", "jabber:x:conference");
195 x.setAttribute("jid", conversation.getJid().toBareJid().toString());
196 String password = conversation.getMucOptions().getPassword();
197 if (password != null) {
198 x.setAttribute("password",password);
199 }
200 return packet;
201 }
202
203 public MessagePacket invite(Conversation conversation, Jid contact) {
204 MessagePacket packet = new MessagePacket();
205 packet.setTo(conversation.getJid().toBareJid());
206 packet.setFrom(conversation.getAccount().getJid());
207 Element x = new Element("x");
208 x.setAttribute("xmlns", "http://jabber.org/protocol/muc#user");
209 Element invite = new Element("invite");
210 invite.setAttribute("to", contact.toBareJid().toString());
211 x.addChild(invite);
212 packet.addChild(x);
213 return packet;
214 }
215
216 public MessagePacket received(Account account, MessagePacket originalMessage, ArrayList<String> namespaces, int type) {
217 MessagePacket receivedPacket = new MessagePacket();
218 receivedPacket.setType(type);
219 receivedPacket.setTo(originalMessage.getFrom());
220 receivedPacket.setFrom(account.getJid());
221 for(String namespace : namespaces) {
222 receivedPacket.addChild("received", namespace).setAttribute("id", originalMessage.getId());
223 }
224 return receivedPacket;
225 }
226
227 public MessagePacket generateOtrError(Jid to, String id, String errorText) {
228 MessagePacket packet = new MessagePacket();
229 packet.setType(MessagePacket.TYPE_ERROR);
230 packet.setAttribute("id",id);
231 packet.setTo(to);
232 Element error = packet.addChild("error");
233 error.setAttribute("code","406");
234 error.setAttribute("type","modify");
235 error.addChild("not-acceptable","urn:ietf:params:xml:ns:xmpp-stanzas");
236 error.addChild("text").setContent("?OTR Error:" + errorText);
237 return packet;
238 }
239}