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diff --git a/src/rabbit_auth_mechanism.erl b/src/rabbit_auth_mechanism.erl
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+%%   The contents of this file are subject to the Mozilla Public License
+%%   Version 1.1 (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.mozilla.org/MPL/
+%%
+%%   Software distributed under the License is distributed on an "AS IS"
+%%   basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
+%%   License for the specific language governing rights and limitations
+%%   under the License.
+%%
+%%   The Original Code is RabbitMQ.
+%%
+%%   The Initial Developers of the Original Code are LShift Ltd,
+%%   Cohesive Financial Technologies LLC, and Rabbit Technologies Ltd.
+%%
+%%   Portions created before 22-Nov-2008 00:00:00 GMT by LShift Ltd,
+%%   Cohesive Financial Technologies LLC, or Rabbit Technologies Ltd
+%%   are Copyright (C) 2007-2008 LShift Ltd, Cohesive Financial
+%%   Technologies LLC, and Rabbit Technologies Ltd.
+%%
+%%   Portions created by LShift Ltd are Copyright (C) 2007-2010 LShift
+%%   Ltd. Portions created by Cohesive Financial Technologies LLC are
+%%   Copyright (C) 2007-2010 Cohesive Financial Technologies
+%%   LLC. Portions created by Rabbit Technologies Ltd are Copyright
+%%   (C) 2007-2010 Rabbit Technologies Ltd.
+%%
+%%   All Rights Reserved.
+%%
+%%   Contributor(s): ______________________________________.
+%%
+
+-module(rabbit_auth_mechanism).
+
+-export([behaviour_info/1]).
+
+behaviour_info(callbacks) ->
+    [
+     %% A description.
+     {description, 0},
+
+     %% Called before authentication starts. Should create a state
+     %% object to be passed through all the stages of authentication.
+     {init, 1},
+
+     %% Handle a stage of authentication. Possible responses:
+     %% {ok, User}
+     %%     Authentication succeeded, and here's the user record.
+     %% {challenge, Challenge, NextState}
+     %%     Another round is needed. Here's the state I want next time.
+     %% {protocol_error, Msg, Args}
+     %%     Client got the protocol wrong. Log and die.
+     %% {refused, Msg, Args}
+     %%     Client failed authentication. Log and die.
+     {handle_response, 2}
+    ];
+behaviour_info(_Other) ->
+    undefined.