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