/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000-2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

#ifndef APACHE_MOD_AUTH_H
#define APACHE_MOD_AUTH_H

#include "apr_pools.h"
#include "apr_hash.h"

#include "httpd.h"

#ifdef __cplusplus
extern "C" {
#endif

/* Create a set of AAA_DECLARE(type) and AAA_DECLARE_DATA with 
 * appropriate export and import tags for the platform
 */
#if !defined(WIN32)
#define AAA_DECLARE(type)            type
#define AAA_DECLARE_DATA
#elif defined(AAA_DECLARE_STATIC)
#define AAA_DECLARE(type)            type __stdcall
#define AAA_DECLARE_DATA
#elif defined(AAA_DECLARE_EXPORT)
#define AAA_DECLARE(type)            __declspec(dllexport) type __stdcall
#define AAA_DECLARE_DATA             __declspec(dllexport)
#else
#define AAA_DECLARE(type)            __declspec(dllimport) type __stdcall
#define AAA_DECLARE_DATA             __declspec(dllimport)
#endif

#define AUTHN_DEFAULT_PROVIDER "file"

typedef enum {
    AUTH_DENIED,
    AUTH_GRANTED,
    AUTH_USER_FOUND,
    AUTH_USER_NOT_FOUND,
    AUTH_GENERAL_ERROR
} authn_status;

typedef struct {
    /* Given a username and password, expected to return AUTH_GRANTED
     * if we can validate this user/password combination.
     */
    authn_status (*check_password)(request_rec *r, const char *user,
                                  const char *password);

    /* Given a user and realm, expected to return AUTH_USER_FOUND if we
     * can find a md5 hash of 'user:realm:password'
     */
    authn_status (*get_realm_hash)(request_rec *r, const char *user,
                                   const char *realm, char **rethash);
} authn_provider;

AAA_DECLARE(void) authn_register_provider(apr_pool_t *p, const char *name,
                                         const authn_provider *provider);
AAA_DECLARE(const authn_provider *) authn_lookup_provider(const char *name);

typedef struct {
    /* For a given user, return a hash of all groups the user belongs to.  */
    apr_hash_t * (*get_user_groups)(request_rec *r, const char *user);
} authz_provider;

AAA_DECLARE(void) authz_register_provider(apr_pool_t *p, const char *name,
                                         const authz_provider *provider);
AAA_DECLARE(const authz_provider *) authz_lookup_provider(const char *name);
#ifdef __cplusplus
}
#endif

#endif