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/* -*- 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 nsILDAPServer;
interface nsILDAPConnection;
interface nsILDAPMessageListener;

/**
 * This interface provides an LDAP connection management service.
 * It's used to cache already established LDAP connections, as well
 * as reaping unused connections after a certain time period. This
 * is done completely asynchronously, using callback functions.
 */


[scriptable, uuid(69de6fbc-2e8c-4482-bf14-358d68b785d1)]
interface nsILDAPService : nsISupports {

    /**
     * Add a (possibly) new LDAP server entry to the service. A
     * server entry holds information about the host, port and
     * other components of the LDAP URL, as well as information
     * used for binding a connection to the LDAP server.
     *
     * An LDAP Server entry (nsILDAPServer) contains the URL,
     * user credentials, and other information related to the actual
     * server itself. It is used for connecting, binding, rebinding,
     * setting timeouts and so forth.
     *
     * @param aServer          an nsILDAPServer object
     *
     * @exception NS_ERROR_FAILURE          the server has already been
     *                                      added to the service
     * @exception NS_ERROR_NULL_POINTER     NULL pointer
     * @exception NS_ERROR_OUT_OF_MEMORY    ran out of memory
     */
    void addServer(in nsILDAPServer aServer);

    /**
     * Mark an LDAP server, in the Service, as a candidate for
     * deletion. If there are still leases ("users") of this server,
     * the operation fails.
     *
     * @param aKey             unique key identifying the server entry
     *
     * @exception NS_ERROR_FAILURE          either the server doesn't
     *                                      exist, or there are still
     *                                      leases oustanding
     */
    void deleteServer(in wstring aKey);

    /**
     * Get the nsILDAPServer object for the specified server entry
     * in the service.
     *
     * @param aKey             unique key identifying the server entry
     *
     * @exception NS_ERROR_FAILURE          there is no server registered
     *                                      in the service with this key
     * @exception NS_ERROR_NULL_POINTER     NULL pointer
     */
    nsILDAPServer getServer(in wstring aKey);

    /**
     * Request a connection from the service, asynchronously. If there is
     * one "cached" already, we will actually call the callback function
     * before returning from this function. This might be considered a bug,
     * but for now be aware of this (see Bugzilla bug #75989).
     *
     * Calling this method does not increment the leases on this connection,
     * you'll have to use the getConnection() method to actually get the
     * connection itself (presumably from the callback/listener object).
     * The listener needs to implement nsILDAPMessageListener, providing
     * the OnLDAPMessage() method.
     * 
     * @param aKey             unique key identifying the server entry
     * @param aMessageListener the listener object, which we will call
     *                         when the LDAP bind message is available
     *
     * @exception NS_ERROR_FAILURE          there is no server registered
     *                                      in the service with this key,
     *                                      or we were unable to get a
     *                                      connection properly to the server
     * @exception NS_ERROR_NOT_AVAILABLE	couldn't create connection thread
     * @exception NS_ERROR_OUT_OF_MEMORY    ran out of memory
     * @exception NS_ERROR_UNEXPECTED       unknown or unexpected error...
     */
    void requestConnection(in wstring aKey,
                           in nsILDAPMessageListener aListener);

    /**
     * This is the nsLDAPConnection object related to this server.
     * This does increase the lease counter on the object, so you have
     * to call the releaseConnection() method to return it. It is
     * important that you do this in matching pairs, and that you do
     * not keep any dangling references to an object around after you
     * have called the releaseConnection() method.
     *
     * @param aKey             unique key identifying the server entry
     *
     * @exception NS_ERROR_FAILURE          there is no server registered
     *                                      in the service with this key
     * @exception NS_ERROR_NULL_POINTER     NULL pointer
     */
    nsILDAPConnection getConnection(in wstring aKey);

    /**
     * Release the lease on a (cached) LDAP connection, making it a
     * potential candidate for disconnection. Note that this will not
     * delete the actual LDAP server entry in the service, it's still
     * registered and can be used in future calls to requestConnection().
     *
     * This API might be deprecated in the future, once we figure out how
     * to use weak references to support our special needs for reference
     * counting. For the time being, it is vital that you call this function
     * when you're done with a Connection, and that you do not keep any
     * copies of the Connection object lingering around.
     *
     * @param aKey             unique key identifying the server entry
     *
     * @exception NS_ERROR_FAILURE          there is no server registered
     *                                      in the service with this key
     * @exception NS_ERROR_OUT_OF_MEMORY    ran out of memory
     */
    void releaseConnection(in wstring aKey);

    /**
     * If we detect that a connection is broken (server disconnected us,
     * or any other problem with the link), we need to try to reestablish
     * the connection. This is very similar to requestConnection(),
     * except you use this when detecting an error with a connection
     * that is being cached.
     *
     * @param aKey             unique key identifying the server entry
     * @param aMessageListener the listener object, which we will call
     *                         when the LDAP bind message is available
     *
     * @exception NS_ERROR_FAILURE          there is no server registered
     *                                      in the service with this key,
     *                                      or we were unable to get a
     *                                      connection properly to the server
     * @exception NS_ERROR_NOT_AVAILABLE	couldn't create connection thread
     * @exception NS_ERROR_OUT_OF_MEMORY    ran out of memory
     * @exception NS_ERROR_UNEXPECTED       unknown or unexpected error...
     */
    void reconnectConnection(in wstring aKey,
                             in nsILDAPMessageListener aListener);

    /**
     * Generates and returns an LDAP search filter by substituting
     * aValue, aAttr, aPrefix, and aSuffix into aPattern.
     *
     * The only good documentation I'm aware of for this function is
     * at <http://docs.iplanet.com/docs/manuals/dirsdk/csdk41/html/filter.htm>
     * and 
     * <http://docs.iplanet.com/docs/manuals/dirsdk/csdk41/html/function.htm#17835>
     * Unfortunately, this does not currently seem to be available
     * under any open source license, so I can't include that
     * documentation here in the doxygen comments.
     *
     * @param aMaxSize   maximum size (in char) of string to be 
     *                   created and returned (including final \0)
     * @param aPattern   pattern to be used for the filter
     * @param aPrefix    prefix to prepend to the filter
     * @param aSuffix    suffix to be appended to the filer
     * @param aAttr      replacement for %a in the pattern
     * @param aValue     replacement for %v in the pattern
     *  
     * @exception NS_ERROR_INVALID_ARG      invalid parameter passed in
     * @exception NS_ERROR_OUT_OF_MEMORY    allocation failed
     * @exception NS_ERROR_NOT_AVAILABLE    filter longer than maxsiz chars
     * @exception NS_ERROR_UNEXPECTED       ldap_create_filter returned
     *                                      unexpected error code
     */
    AUTF8String createFilter(in unsigned long aMaxSize, in AUTF8String aPattern, 
                             in AUTF8String aPrefix, in AUTF8String aSuffix,
                             in AUTF8String aAttr, in AUTF8String aValue);

    /**
     * Parses a distinguished name (DN) and returns the relative DN,
     * base DN and the list of attributes that make up the relative DN.
     *
     * @param dn        DN to parse
     * @param rdn       The relative DN for the given DN
     * @param baseDn    The base DN for the given DN
     * @param rdnCount  Number of values in the outbound attributes array.
     * @param rdnAttrs  Array of attribute names
     *
     */
    void parseDn(in string dn, out AUTF8String rdn, out AUTF8String baseDn,
                 out unsigned long rdnCount,
                 [retval, array, size_is(rdnCount)] out string rdnAttrs);
};