/*
 * Copyright (c) 2017, RISE SICS AB.
 * 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. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS 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
 * COPYRIGHT HOLDER OR 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.
 */

/**
 * \file
 *         A simple keystore with fixed credentials.
 * \author
 *         Niclas Finne <nfi@sics.se>
 *         Joakim Eriksson <joakime@sics.se>
 */

#include "coap-endpoint.h"
#include "coap-keystore.h"
#include <string.h>

/* #ifndef PSK_DEFAULT_IDENTITY */
/* #define PSK_DEFAULT_IDENTITY "Client_identity" */
/* #endif /\* PSK_DEFAULT_IDENTITY *\/ */

/* #ifndef PSK_DEFAULT_KEY */
/* #define PSK_DEFAULT_KEY      "secretPSK" */
/* #endif /\* PSK_DEFAULT_KEY *\/ */
/*---------------------------------------------------------------------------*/
#ifdef WITH_DTLS
#if defined(PSK_DEFAULT_IDENTITY) && defined(PSK_DEFAULT_KEY)
static int
get_default_psk_info(const coap_endpoint_t *address_info,
                     coap_keystore_psk_entry_t *info)
{
  if(info != NULL) {
    if(info->identity == NULL || info->identity_len == 0) {
      /* Identity requested */
      info->identity = (uint8_t *)PSK_DEFAULT_IDENTITY;
      info->identity_len = strlen(PSK_DEFAULT_IDENTITY);
      return 1;
    }
    if(info->identity_len != strlen(PSK_DEFAULT_IDENTITY) ||
       memcmp(info->identity, PSK_DEFAULT_IDENTITY, info->identity_len) != 0) {
      /* Identity not matching */
      return 0;
    }
    info->key = (uint8_t *)PSK_DEFAULT_KEY;
    info->key_len = strlen(PSK_DEFAULT_KEY);
    return 1;
  }
  return 0;
}
static const coap_keystore_t simple_key_store = {
  .coap_get_psk_info = get_default_psk_info
};
#endif /* defined(PSK_DEFAULT_IDENTITY) && defined(PSK_DEFAULT_KEY) */
#endif /* WITH_DTLS */
/*---------------------------------------------------------------------------*/
void
coap_store_simple_init(void)
{
#ifdef WITH_DTLS
#if defined(PSK_DEFAULT_IDENTITY) && defined(PSK_DEFAULT_KEY)
  coap_set_keystore(&simple_key_store);
#endif /* defined(PSK_DEFAULT_IDENTITY) && defined(PSK_DEFAULT_KEY) */
#endif /* WITH_DTLS */
}
/*---------------------------------------------------------------------------*/