answer to xep 184 message receipts. fixes #95

res/values/arrays.xml

@@ -1,12 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <array name="resources">
+    <string-array name="resources">
         <item>Mobile</item>
         <item>Phone</item>
         <item>Tablet</item>
         <item>Conversations</item>
         <item>Android</item>
-    </array>
+    </string-array>
     <string-array name="filesizes">
         <item>never</item>
         <item>256 KB</item>
@@ -19,4 +19,16 @@
         <item>524288</item>
         <item>1048576</item>
     </string-array>
+    <string-array name="message_acks">
+        <item>never</item>
+        <item>when received</item>
+        <item>when read</item>
+        <item>when received and when read</item>
+    </string-array>
+    <string-array name="message_acks_values">
+		<item>0</item>
+		<item>1</item>
+		<item>2</item>
+		<item>3</item>        
+    </string-array>
 </resources>

res/values/strings.xml

@@ -145,6 +145,8 @@
     <string name="pref_advanced_options">Advanced Options</string>
     <string name="pref_never_send_crash">Never send crash reports</string>
     <string name="pref_never_send_crash_summary">By sending in stack traces you are helping the ongoing development of Conversations</string>
+    <string name="pref_auto_acknowledge_messages">Acknowledge Messages</string>
+    <string name="pref_auto_acknowledge_messages_summary">Allows your contact to know whether or not you have received or read a specific message</string>
     <string name="openpgp_error">OpenKeychain reporeted an error</string>
     <string name="error_decrypting_file">I/O Error decrypting file</string>
     <string name="error_copying_image_file">Error copying image file.</string>

res/xml/preferences.xml

@@ -22,6 +22,14 @@
             android:entries="@array/filesizes"
             android:entryValues="@array/filesizes_values"
             android:defaultValue="524288"/>
+        <ListPreference 
+            android:key="auto_acknowledge_messages"
+            android:title="@string/pref_auto_acknowledge_messages"
+            android:summary="@string/pref_auto_acknowledge_messages_summary"
+            android:entries="@array/message_acks"
+            android:entryValues="@array/message_acks_values"
+            android:defaultValue="2"
+            />
     </PreferenceCategory>
     <PreferenceCategory 
         android:title="@string/pref_notification_settings">

src/eu/siacs/conversations/services/XmppConnectionService.java

@@ -140,6 +140,7 @@ public class XmppConnectionService extends Service {
 				notify = (SystemClock.elapsedRealtime() - lastCarbonMessageReceived) > CARBON_GRACE_PERIOD;
 			}
 			
+
 			if ((packet.getType() == MessagePacket.TYPE_CHAT)) {
 				String pgpBody = mMessageParser.getPgpBody(packet);
 				if (pgpBody != null) {
@@ -217,6 +218,25 @@ public class XmppConnectionService extends Service {
 					Log.d(LOGTAG, "error trying to parse date" + e.getMessage());
 				}
 			}
+			if ((confirmReception()) && ((packet.getId() != null))) {
+				MessagePacket receivedPacket = new MessagePacket();
+				receivedPacket.setType(MessagePacket.TYPE_UNKNOWN);
+				receivedPacket.setTo(message.getCounterpart());
+				receivedPacket.setFrom(account.getFullJid());
+				if (packet.hasChild("markable", "urn:xmpp:chat-markers:0")) {
+					Element received = receivedPacket.addChild("received",
+							"urn:xmpp:chat-markers:0");
+					received.setAttribute("id", packet.getId());
+					account.getXmppConnection().sendMessagePacket(
+							receivedPacket);
+				} else if (packet.hasChild("request", "urn:xmpp:receipts")) {
+					Element received = receivedPacket.addChild("received",
+							"urn:xmpp:receipts");
+					received.setAttribute("id", packet.getId());
+					account.getXmppConnection().sendMessagePacket(
+							receivedPacket);
+				}
+			}
 			Conversation conversation = message.getConversation();
 			conversation.getMessages().add(message);
 			if (packet.getType() != MessagePacket.TYPE_ERROR) {
@@ -336,7 +356,8 @@ public class XmppConnectionService extends Service {
 											msg, x.getContent()));
 								}
 							}
-							onContactStatusChanged.onContactStatusChanged(contact);
+							onContactStatusChanged
+									.onContactStatusChanged(contact);
 						}
 					} else if (type.equals("unavailable")) {
 						if (fromParts.length != 2) {
@@ -400,6 +421,9 @@ public class XmppConnectionService extends Service {
 						"urn:xmpp:jingle:transports:s5b:1");
 				query.addChild("feature").setAttribute("var",
 						"urn:xmpp:jingle:transports:ibb:1");
+				if (confirmReception()) {
+					query.addChild("feature").setAttribute("var", "urn:xmpp:receipts");
+				}
 				account.getXmppConnection().sendIqPacket(iqResponse, null);
 			} else {
 				if ((packet.getType() == IqPacket.TYPE_GET)
@@ -868,6 +892,7 @@ public class XmppConnectionService extends Service {
 				packet.setTo(message.getCounterpart());
 				packet.setFrom(account.getJid());
 			}
+			packet.addChild("markable", "urn:xmpp:chat-markers:0");
 		} else if (message.getConversation().getMode() == Conversation.MODE_MULTI) {
 			packet.setType(MessagePacket.TYPE_GROUPCHAT);
 			packet.setBody(message.getBody());
@@ -1133,8 +1158,7 @@ public class XmppConnectionService extends Service {
 			x.addChild("history").setAttribute("seconds", diff + "");
 		}
 		packet.addChild(x);
-		account.getXmppConnection()
+		account.getXmppConnection().sendPresencePacket(packet);
-				.sendPresencePacket(packet);
 	}
 
 	private OnRenameListener renameListener = null;
@@ -1424,6 +1448,18 @@ public class XmppConnectionService extends Service {
 				.getDefaultSharedPreferences(getApplicationContext());
 	}
 	
+	private boolean confirmReception() {
+		String autoAcks = getPreferences().getString(
+				"auto_acknowledge_messages", "2");
+		int autoAcksValue;
+		try {
+			autoAcksValue = Integer.parseInt(autoAcks);
+		} catch (NumberFormatException e) {
+			autoAcksValue = 0;
+		}
+		return autoAcksValue == 1 || autoAcksValue == 3;
+	}
+
 	public void updateUi(Conversation conversation, boolean notify) {
 		if (convChangedListener != null) {
 			convChangedListener.onConversationListChanged();

src/eu/siacs/conversations/xmpp/stanzas/MessagePacket.java

@@ -37,6 +37,8 @@ public class MessagePacket extends AbstractStanza {
 		case TYPE_GROUPCHAT:
 			this.setAttribute("type", "groupchat");
 			break;
+		case TYPE_UNKNOWN:
+			break;
 		default:
 			this.setAttribute("type","chat");
 			break;