OF-1422 Check all MUCRoles, handle nickname changes (#912)

* OF-1422 Check all MUCRoles to see if this is rejoin

* Handle errors and other presence better in MUC

Also refuse nickname changes on shared nicknames,
since they don't currently work.

* Crazy wRong Line-ending Fix

src/java/org/jivesoftware/openfire/muc/spi/LocalMUCRoom.java

@@ -585,9 +585,12 @@ public class LocalMUCRoom implements MUCRoom, GroupEventListener {
                     // Nickname is already used, and not by the same JID
                     throw new UserAlreadyExistsException();
                 }
-                // Is this client already joined?
-                if (occupantsByFullJID.containsKey(user.getAddress())) {
-                    clientOnlyJoin = true; // This user is already an occupant. The client thinks it isn't. (Or else this is a broken gmail).
+                // Is this client already joined with this nickname?
+                for (MUCRole mucRole : occupants) {
+                    if (mucRole.getUserAddress().equals(user.getAddress())) {
+                        clientOnlyJoin = true;
+                        break;
+                    }
                 }
             }
             // If the room is password protected and the provided password is incorrect raise a

src/java/org/jivesoftware/openfire/muc/spi/LocalMUCUser.java

@@ -435,10 +435,6 @@ public class LocalMUCUser implements MUCUser {
     }
 
     public void process(Presence packet) {
-        // Ignore presences of type ERROR sent to a room
-        if (Presence.Type.error == packet.getType()) {
-            return;
-        }
         lastPacketTime = System.currentTimeMillis();
         JID recipient = packet.getTo();
         String group = recipient.getNode();
@@ -503,20 +499,17 @@ public class LocalMUCUser implements MUCUser {
                             sendErrorPacket(packet, PacketError.Condition.not_allowed);
                         }
                     }
-                    else {
-                        // TODO: send error message to user (can't send presence to group you
-                        // haven't joined)
+                    else if (packet.getType() != Presence.Type.error) {
+                        sendErrorPacket(packet, PacketError.Condition.unexpected_request);
                     }
                 }
                 else {
-                    if (packet.isAvailable()) {
+                    if (packet.getType() != Presence.Type.error) {
                         // A resource is required in order to join a room
                         // http://xmpp.org/extensions/xep-0045.html#enter
                         // If the user does not specify a room nickname (note the bare JID on the 'from' address in the following example), the service MUST return a <jid-malformed/> error
                         sendErrorPacket(packet, PacketError.Condition.jid_malformed);
                     }
-                    // TODO: send error message to user (can't send packets to group you haven't
-                    // joined)
                 }
             }
             else {
@@ -550,8 +543,11 @@ public class LocalMUCUser implements MUCUser {
                                 // Occupant has changed his nickname. Send two presences
                                 // to each room occupant
 
+                                if (role.getChatRoom().getOccupantsByBareJID(packet.getFrom().asBareJID()).size() > 1) {
+                                    sendErrorPacket(packet, PacketError.Condition.not_acceptable);
+                                }
                                 // Check if occupants are allowed to change their nicknames
-                                if (!role.getChatRoom().canChangeNickname()) {
+                                else if (!role.getChatRoom().canChangeNickname()) {
                                     sendErrorPacket(packet, PacketError.Condition.not_acceptable);
                                 }
                                 // Answer a conflic error if the new nickname is taken