/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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 "nsISupports.idl"

interface nsIURI;
interface nsIPrompt;
interface nsIChannel;

/**
 * nsICookieService
 *
 * Provides methods for setting and getting cookies in the context of a
 * page load.  See nsICookieManager for methods to manipulate the cookie
 * database directly.  This separation of interface is mainly historical.
 *
 * This service broadcasts the notifications detailed below when the cookie
 * list is changed, or a cookie is rejected.
 *
 * NOTE: observers of these notifications *must* not attempt to change profile
 *       or switch into or out of private browsing mode from within the
 *       observer. Doing so will cause undefined behavior. Mutating the cookie
 *       list (e.g. by calling methods on nsICookieService and friends) is
 *       allowed, but beware that there may be pending notifications you haven't
 *       seen yet -- for instance, a "batch-deleted" notification will likely be
 *       immediately followed by "added". You may check the state of the cookie
 *       list to determine if this is the case.
 *
 * topic  : "cookie-changed"
 *          broadcast whenever the cookie list changes in some way. see
 *          explanation of data strings below.
 * subject: see below.
 * data   : "deleted"
 *          a cookie was deleted. the subject is an nsICookie2 representing
 *          the deleted cookie.
 *          "added"
 *          a cookie was added. the subject is an nsICookie2 representing
 *          the added cookie.
 *          "changed"
 *          a cookie was changed. the subject is an nsICookie2 representing
 *          the new cookie. (note that host, path, and name are invariant
 *          for a given cookie; other parameters may change.)
 *          "batch-deleted"
 *          a set of cookies was purged (typically, because they have either
 *          expired or because the cookie list has grown too large). The subject
 *          is an nsIArray of nsICookie2's representing the deleted cookies.
 *          Note that the array could contain a single cookie.
 *          "cleared"
 *          the entire cookie list was cleared. the subject is null.
 *
 * topic  : "cookie-rejected"
 *          broadcast whenever a cookie was rejected from being set as a
 *          result of user prefs.
 * subject: an nsIURI interface pointer representing the URI that attempted
 *          to set the cookie.
 * data   : none.
 *
 * topic  : "third-party-cookie-accepted"
 *           broadcast whenever a third party cookie was accepted
 * subject:  an nsIURI interface pointer representing the URI that attempted
 *           to set the cookie.
 * data   :  the referrer, or "?" if unknown
 *
 * topic  : "third-party-cookie-rejected"
 *           broadcast whenever a third party cookie was rejected
 * subject:  an nsIURI interface pointer representing the URI that attempted
 *           to set the cookie.
 * data   :  the referrer, or "?" if unknown
 */
[scriptable, uuid(1e94e283-2811-4f43-b947-d22b1549d824)]
interface nsICookieService : nsISupports
{
  /*
   * Possible values for the "network.cookie.cookieBehavior" preference.
   */
  const uint32_t BEHAVIOR_ACCEPT         = 0; // allow all cookies
  const uint32_t BEHAVIOR_REJECT_FOREIGN = 1; // reject all third-party cookies
  const uint32_t BEHAVIOR_REJECT         = 2; // reject all cookies
  const uint32_t BEHAVIOR_LIMIT_FOREIGN  = 3; // reject third-party cookies unless the
                                              // eTLD already has at least one cookie

  /*
   * Possible values for the "network.cookie.lifetimePolicy" preference.
   */
  const uint32_t ACCEPT_NORMALLY   = 0; // accept normally
  // Value = 1 is considered the same as 0 (See Bug 606655).
  const uint32_t ACCEPT_SESSION    = 2; // downgrade to session
  const uint32_t ACCEPT_FOR_N_DAYS = 3; // limit lifetime to N days

  /*
   * Get the complete cookie string associated with the URI.
   *
   * @param aURI
   *        The URI of the document for which cookies are being queried.
   *        file:// URIs (i.e. with an empty host) are allowed, but any other
   *        scheme must have a non-empty host. A trailing dot in the host
   *        is acceptable, and will be stripped. This argument must not be null.
   * @param aChannel
   *        the channel used to load the document.  this parameter should not
   *        be null, otherwise the cookies will not be returned if third-party
   *        cookies have been disabled by the user. (the channel is used
   *        to determine the originating URI of the document; if it is not
   *        provided, the cookies will be assumed third-party.)
   *
   * @return the resulting cookie string
   */
  string getCookieString(in nsIURI aURI, in nsIChannel aChannel);

  /*
   * Get the complete cookie string associated with the URI.
   *
   * This function is NOT redundant with getCookieString, as the result
   * will be different based on httponly (see bug 178993)
   *
   * @param aURI
   *        The URI of the document for which cookies are being queried.
   *        file:// URIs (i.e. with an empty host) are allowed, but any other
   *        scheme must have a non-empty host. A trailing dot in the host
   *        is acceptable, and will be stripped. This argument must not be null.
   * @param aFirstURI
   *        the URI that the user originally typed in or clicked on to initiate
   *        the load of the document referenced by aURI.
   * @param aChannel
   *        the channel used to load the document.  this parameter should not
   *        be null, otherwise the cookies will not be returned if third-party
   *        cookies have been disabled by the user. (the channel is used
   *        to determine the originating URI of the document; if it is not
   *        provided, the cookies will be assumed third-party.)
   *
   * @return the resulting cookie string
   */
  string getCookieStringFromHttp(in nsIURI aURI, in nsIURI aFirstURI, in nsIChannel aChannel);

  /*
   * Set the cookie string associated with the URI.
   *
   * @param aURI
   *        The URI of the document for which cookies are being queried.
   *        file:// URIs (i.e. with an empty host) are allowed, but any other
   *        scheme must have a non-empty host. A trailing dot in the host
   *        is acceptable, and will be stripped. This argument must not be null.
   * @param aPrompt
   *        the prompt to use for all user-level cookie notifications. This is
   *        presently ignored and can be null. (Prompt information is determined
   *        from the channel if necessary.)
   * @param aCookie
   *        the cookie string to set.
   * @param aChannel
   *        the channel used to load the document.  this parameter should not
   *        be null, otherwise the cookies will not be set if third-party
   *        cookies have been disabled by the user. (the channel is used
   *        to determine the originating URI of the document; if it is not
   *        provided, the cookies will be assumed third-party.)
   */
  void setCookieString(in nsIURI aURI, in nsIPrompt aPrompt, in string aCookie, in nsIChannel aChannel);

  /*
   * Set the cookie string and expires associated with the URI.
   *
   * This function is NOT redundant with setCookieString, as the result
   * will be different based on httponly (see bug 178993)
   *
   * @param aURI
   *        The URI of the document for which cookies are being queried.
   *        file:// URIs (i.e. with an empty host) are allowed, but any other
   *        scheme must have a non-empty host. A trailing dot in the host
   *        is acceptable, and will be stripped. This argument must not be null.
   * @param aFirstURI
   *        the URI that the user originally typed in or clicked on to initiate
   *        the load of the document referenced by aURI.
   * @param aPrompt
   *        the prompt to use for all user-level cookie notifications. This is
   *        presently ignored and can be null. (Prompt information is determined
   *        from the channel if necessary.)
   * @param aCookie
   *        the cookie string to set.
   * @param aServerTime
   *        the current time reported by the server, if available. This should
   *        be the string from the Date header in an HTTP response. If the
   *        string is empty or null, server time is assumed to be the current
   *        local time. If provided, it will be used to calculate the expiry
   *        time of the cookie relative to the server's local time.
   * @param aChannel
   *        the channel used to load the document.  this parameter should not
   *        be null, otherwise the cookies will not be set if third-party
   *        cookies have been disabled by the user. (the channel is used
   *        to determine the originating URI of the document; if it is not
   *        provided, the cookies will be assumed third-party.)
   */
  void setCookieStringFromHttp(in nsIURI aURI, in nsIURI aFirstURI, in nsIPrompt aPrompt, in string aCookie, in string aServerTime, in nsIChannel aChannel);
};
