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Change-Id: I49ce97136c17173c4ae3965c694af6e7bc49897d

1 files changed, 202 insertions, 0 deletions

diff --git a/src/org/jivesoftware/smackx/receipts/DeliveryReceiptManager.java b/src/org/jivesoftware/smackx/receipts/DeliveryReceiptManager.java
new file mode 100644
index 0000000..125b87e
--- /dev/null
+++ b/src/org/jivesoftware/smackx/receipts/DeliveryReceiptManager.java
@@ -0,0 +1,202 @@
+/**
+ * Copyright 2013 Georg Lukas
+ *
+ * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jivesoftware.smackx.receipts;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.WeakHashMap;
+
+import org.jivesoftware.smack.Connection;
+import org.jivesoftware.smack.ConnectionCreationListener;
+import org.jivesoftware.smack.PacketListener;
+import org.jivesoftware.smack.XMPPException;
+import org.jivesoftware.smack.filter.PacketExtensionFilter;
+import org.jivesoftware.smack.packet.Message;
+import org.jivesoftware.smack.packet.Packet;
+import org.jivesoftware.smackx.ServiceDiscoveryManager;
+import org.jivesoftware.smackx.packet.DiscoverInfo;
+
+/**
+ * Manager for XEP-0184: Message Delivery Receipts. This class implements
+ * the manager for {@link DeliveryReceipt} support, enabling and disabling of
+ * automatic DeliveryReceipt transmission.
+ *
+ * @author Georg Lukas
+ */
+public class DeliveryReceiptManager implements PacketListener {
+
+    private static Map<Connection, DeliveryReceiptManager> instances =
+            Collections.synchronizedMap(new WeakHashMap<Connection, DeliveryReceiptManager>());
+
+    static {
+        Connection.addConnectionCreationListener(new ConnectionCreationListener() {
+            public void connectionCreated(Connection connection) {
+                new DeliveryReceiptManager(connection);
+            }
+        });
+    }
+
+    private Connection connection;
+    private boolean auto_receipts_enabled = false;
+    private Set<ReceiptReceivedListener> receiptReceivedListeners = Collections
+            .synchronizedSet(new HashSet<ReceiptReceivedListener>());
+
+    private DeliveryReceiptManager(Connection connection) {
+        ServiceDiscoveryManager sdm = ServiceDiscoveryManager.getInstanceFor(connection);
+        sdm.addFeature(DeliveryReceipt.NAMESPACE);
+        this.connection = connection;
+        instances.put(connection, this);
+
+        // register listener for delivery receipts and requests
+        connection.addPacketListener(this, new PacketExtensionFilter(DeliveryReceipt.NAMESPACE));
+    }
+
+    /**
+     * Obtain the DeliveryReceiptManager responsible for a connection.
+     *
+     * @param connection the connection object.
+     *
+     * @return the DeliveryReceiptManager instance for the given connection
+     */
+    synchronized public static DeliveryReceiptManager getInstanceFor(Connection connection) {
+        DeliveryReceiptManager receiptManager = instances.get(connection);
+
+        if (receiptManager == null) {
+            receiptManager = new DeliveryReceiptManager(connection);
+        }
+
+        return receiptManager;
+    }
+
+    /**
+     * Returns true if Delivery Receipts are supported by a given JID
+     * 
+     * @param jid
+     * @return true if supported
+     */
+    public boolean isSupported(String jid) {
+        try {
+            DiscoverInfo result =
+                ServiceDiscoveryManager.getInstanceFor(connection).discoverInfo(jid);
+            return result.containsFeature(DeliveryReceipt.NAMESPACE);
+        }
+        catch (XMPPException e) {
+            return false;
+        }
+    }
+
+    // handle incoming receipts and receipt requests
+    @Override
+    public void processPacket(Packet packet) {
+        DeliveryReceipt dr = (DeliveryReceipt)packet.getExtension(
+                DeliveryReceipt.ELEMENT, DeliveryReceipt.NAMESPACE);
+        if (dr != null) {
+            // notify listeners of incoming receipt
+            for (ReceiptReceivedListener l : receiptReceivedListeners) {
+                l.onReceiptReceived(packet.getFrom(), packet.getTo(), dr.getId());
+            }
+
+        }
+
+        // if enabled, automatically send a receipt
+        if (auto_receipts_enabled) {
+            DeliveryReceiptRequest drr = (DeliveryReceiptRequest)packet.getExtension(
+                    DeliveryReceiptRequest.ELEMENT, DeliveryReceipt.NAMESPACE);
+            if (drr != null) {
+                Message ack = new Message(packet.getFrom(), Message.Type.normal);
+                ack.addExtension(new DeliveryReceipt(packet.getPacketID()));
+                connection.sendPacket(ack);
+            }
+        }
+    }
+
+    /**
+     * Configure whether the {@link DeliveryReceiptManager} should automatically
+     * reply to incoming {@link DeliveryReceipt}s. By default, this feature is off.
+     *
+     * @param new_state whether automatic transmission of
+     *                  DeliveryReceipts should be enabled or disabled
+     */
+    public void setAutoReceiptsEnabled(boolean new_state) {
+        auto_receipts_enabled = new_state;
+    }
+
+    /**
+     * Helper method to enable automatic DeliveryReceipt transmission.
+     */
+    public void enableAutoReceipts() {
+        setAutoReceiptsEnabled(true);
+    }
+
+    /**
+     * Helper method to disable automatic DeliveryReceipt transmission.
+     */
+    public void disableAutoReceipts() {
+        setAutoReceiptsEnabled(false);
+    }
+
+    /**
+     * Check if AutoReceipts are enabled on this connection.
+     */
+    public boolean getAutoReceiptsEnabled() {
+        return this.auto_receipts_enabled;
+    }
+
+    /**
+     * Get informed about incoming delivery receipts with a {@link ReceiptReceivedListener}.
+     * 
+     * @param listener the listener to be informed about new receipts
+     */
+    public void addReceiptReceivedListener(ReceiptReceivedListener listener) {
+        receiptReceivedListeners.add(listener);
+    }
+
+    /**
+     * Stop getting informed about incoming delivery receipts.
+     * 
+     * @param listener the listener to be removed
+     */
+    public void removeReceiptReceivedListener(ReceiptReceivedListener listener) {
+        receiptReceivedListeners.remove(listener);
+    }
+
+    /**
+     * Test if a packet requires a delivery receipt.
+     *
+     * @param p Packet object to check for a DeliveryReceiptRequest
+     *
+     * @return true if a delivery receipt was requested
+     */
+    public static boolean hasDeliveryReceiptRequest(Packet p) {
+        return (p.getExtension(DeliveryReceiptRequest.ELEMENT,
+                    DeliveryReceipt.NAMESPACE) != null);
+    }
+
+    /**
+     * Add a delivery receipt request to an outgoing packet.
+     *
+     * Only message packets may contain receipt requests as of XEP-0184,
+     * therefore only allow Message as the parameter type.
+     *
+     * @param m Message object to add a request to
+     */
+    public static void addDeliveryReceiptRequest(Message m) {
+        m.addExtension(new DeliveryReceiptRequest());
+    }
+}