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/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * 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 mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Wellington Fernando de Macedo.
 * Portions created by the Initial Developer are Copyright (C) 2009
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *    Wellington Fernando de Macedo <wfernandom2004@gmail.com> (original author)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * the provisions above, a recipient may use your version of this file under
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 *
 * ***** END LICENSE BLOCK ***** */

#include "nsICancelable.idl"

interface nsIHttpChannel;
interface nsIHttpAuthenticableChannel;

/**
 * nsIHttpChannelAuthProvider
 *
 * This interface is intended for providing authentication for http-style
 * channels, like nsIHttpChannel and nsIMozWebSocket, which implement the
 * nsIHttpAuthenticableChannel interface.
 *
 * When requesting pages AddAuthorizationHeaders MUST be called
 * in order to get the http cached headers credentials. When the request is
 * unsuccessful because of receiving either a 401 or 407 http response code
 * ProcessAuthentication MUST be called and the page MUST be requested again
 * with the new credentials that the user has provided. After a successful
 * request, checkForSuperfluousAuth MAY be called, and disconnect MUST be
 * called.
 */

[scriptable, uuid(c68f3def-c7c8-4ee8-861c-eef49a48b702)]
interface nsIHttpChannelAuthProvider : nsICancelable
{
  /**
   * Initializes the http authentication support for the channel.
   * Implementations must hold a weak reference of the channel.
   */
  void init(in nsIHttpAuthenticableChannel channel);

  /**
   * Upon receipt of a server challenge, this function is called to determine
   * the credentials to send.
   *
   * @param httpStatus
   *        the http status received.
   * @param sslConnectFailed
   *        if the last ssl tunnel connection attempt was or not successful.
   * @param callback
   *        the callback to be called when it returns NS_ERROR_IN_PROGRESS.
   *        The implementation must hold a weak reference.
   *
   * @returns NS_OK if the credentials were got and set successfully.
   *          NS_ERROR_IN_PROGRESS if the credentials are going to be asked to
   *                               the user. The channel reference must be
   *                               alive until the feedback from
   *                               nsIHttpAuthenticableChannel's methods or
   *                               until disconnect be called.
   */
  void processAuthentication(in unsigned long httpStatus,
                             in boolean sslConnectFailed);

  /**
   * Add credentials from the http auth cache.
   */
  void addAuthorizationHeaders();

  /**
   * Check if an unnecessary(and maybe malicious) url authentication has been
   * provided.
   */
  void checkForSuperfluousAuth();

  /**
   * Cancel pending user auth prompts and release the callback and channel
   * weak references.
   */
  void disconnect(in nsresult status);
};
