/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 ts=8 et tw=80 : */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsICancelable.idl"

interface nsIHttpChannel;
interface nsIHttpAuthenticableChannel;

/**
 * nsIHttpChannelAuthProvider
 *
 * This interface is intended for providing authentication for http-style
 * channels, like nsIHttpChannel and nsIWebSocket, 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(1b74d211-8980-42d4-b0ce-caafa73f4a0f)]
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.
   *
   * @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 or other blocking event such as DNS
   *                               is incurred. 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 channel
   * weak reference.
   */
  void disconnect(in nsresult status);

  /**
   * The host portion of the URI, possibly canonicalized
   */
  readonly attribute ACString asciiHostForAuth;
};