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## org.jivesoftware.openfire.interceptor
Interface PacketInterceptor

All Known Implementing Classes:
  PacketCopier

    public interface PacketInterceptor

A packet interceptor encapsulates an action that is invoked on a packet immediately before or after it was received by a SocketReader and also when the packet is about to be sent in SocketConnection. These types of actions fall into two broad categories:

- Interceptors that reject the packet by throwing an exception (only when the packet has not been processed yet).
- Interceptors that dynamically transform the packet content.

Any number of interceptors can be installed and removed at run-time. They can be installed globally or per-user. Global interceptors are run first, followed by any that are installed for the username.

Author:
  Gaston Dombiak
See Also:
  `InterceptorManager`

Method Summary
`void` | `interceptPacket(org.xmpp.packet.Packet packet, Session session, boolean incoming, boolean processed)` Invokes the interceptor on the specified packet.

Method Detail

### interceptPacket

    void interceptPacket(org.xmpp.packet.Packet packet,
                         Session session,
                         boolean incoming,
                         boolean processed)
                         throws PacketRejectedException

  Invokes the interceptor on the specified packet. The interceptor can either modify the packet, or throw a PacketRejectedException to block it from being sent or processed (when read).

  An exception can only be thrown when `processed` is false which means that the read packet has not been processed yet or the packet was not sent yet. If the exception is thrown with a "read" packet then the sender of the packet will receive an answer with an error. But if the exception is thrown with a "sent" packet then nothing will happen.

  Note that for each packet, every interceptor will be called twice: once before processing is complete (`processing==true`) and once after processing is complete. Typically, an interceptor will want to ignore one or the other case.

  Parameters:
    `packet` - the packet to take action on.
    `session` - the session that received or is sending the packet.
    `incoming` - flag that indicates if the packet was read by the server or sent from the server.
    `processed` - flag that indicates if the action (read/send) was performed. (PRE vs. POST).
  Throws:
    `PacketRejectedException` - if the packet should be prevented from being processed.

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