text: /**
   * Copyright (c) 2016 - 2017, Nordic Semiconductor ASA
   * 
   * 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, except as embedded into a Nordic
   *    Semiconductor ASA integrated circuit in a product or a software update for
   *    such product, 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 Nordic Semiconductor ASA nor the names of its
   *    contributors may be used to endorse or promote products derived from this
   *    software without specific prior written permission.
   * 
   * 4. This software, with or without modification, must only be used with a
   *    Nordic Semiconductor ASA integrated circuit.
   * 
   * 5. Any software provided in binary form under this license must not be reverse
   *    engineered, decompiled, modified and/or disassembled.
   * 
   * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
   * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA 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.
   * 
   */
  
  #include "es_gatts.h"
  #include "es_gatts_read.h"
  #include "es_gatts_write.h"
  #include "es_slot.h"
  
  static nrf_ble_escs_lock_state_read_t m_lock_state;
  static uint8_t                        m_active_slot;
  
  /**@brief Function checking if beacon is unlocked.
   *
   * @param[in] p_escs Pointer to Eddystone Configuration Service.
   *
   * @retval true  If beacon is unlocked.
   * @retval false If beacon is locked.
   */
  static bool is_beacon_unlocked(const nrf_ble_escs_t * p_escs)
  {
      return m_lock_state != NRF_BLE_ESCS_LOCK_STATE_LOCKED;
  }
  
  
  ret_code_t es_gatts_send_reply(nrf_ble_escs_t *                        p_escs,
                                 ble_gatts_rw_authorize_reply_params_t * p_reply)
  {
      VERIFY_PARAM_NOT_NULL(p_escs);
      VERIFY_PARAM_NOT_NULL(p_reply);
  
      if (p_escs->conn_handle != BLE_CONN_HANDLE_INVALID)
      {
          return sd_ble_gatts_rw_authorize_reply(p_escs->conn_handle, p_reply);
      }
  
      return NRF_ERROR_INVALID_STATE;
  }
  
  
  ret_code_t es_gatts_send_op_not_permitted(nrf_ble_escs_t * p_escs, bool read)
  {
      ble_gatts_rw_authorize_reply_params_t reply = {0};
  
      VERIFY_PARAM_NOT_NULL(p_escs);
  
      if (read)
      {
          reply.type                    = BLE_GATTS_AUTHORIZE_TYPE_READ;
          reply.params.read.gatt_status = BLE_GATT_STATUS_ATTERR_READ_NOT_PERMITTED;
      }
  
      else
      {
          reply.type                     = BLE_GATTS_AUTHORIZE_TYPE_WRITE;
          reply.params.write.gatt_status = BLE_GATT_STATUS_ATTERR_WRITE_NOT_PERMITTED;
      }
  
      return es_gatts_send_reply(p_escs, &reply);
  }
  
  
  
  void es_gatts_handle_write(nrf_ble_escs_t     * p_escs,
                                  uint16_t        uuid,
                                  uint16_t        val_handle,
                                  uint8_t const * p_data,
                                  uint16_t        length)
  {
      ret_code_t err_code;
  
      if (is_beacon_unlocked(p_escs))
      {
          if (uuid == BLE_UUID_ESCS_UNLOCK_CHAR)
          {
              err_code = es_gatts_send_op_not_permitted(p_escs, false);
              APP_ERROR_CHECK(err_code);
          }
  
          else
          {
              err_code = es_gatts_write_handle_unlocked_write(
                  p_escs, uuid, val_handle, p_data, length, m_active_slot);
              APP_ERROR_CHECK(err_code);
          }
      }
  
      else
      {
          if (uuid == BLE_UUID_ESCS_UNLOCK_CHAR)
          {
              err_code = es_gatts_write_handle_unlock(p_escs, p_data, length, val_handle);
              APP_ERROR_CHECK(err_code);
          }
  
          else
          {
              err_code = es_gatts_send_op_not_permitted(p_escs, false);
              APP_ERROR_CHECK(err_code);
          }
      }
  }
  
  
  void es_gatts_handle_read(nrf_ble_escs_t * p_escs, uint16_t uuid, uint16_t val_handle)
  {
      ret_code_t err_code;
  
      if (is_beacon_unlocked(p_escs))
      {
          if (uuid == BLE_UUID_ESCS_UNLOCK_CHAR)
          {
              err_code = es_gatts_send_op_not_permitted(p_escs, true);
              APP_ERROR_CHECK(err_code);
          }
  
          else
          {
              err_code = es_gatts_read_handle_unlocked_read(p_escs, uuid, val_handle, m_active_slot, m_lock_state);
              APP_ERROR_CHECK(err_code);
          }
      }
  
      else // Beacon is locked.
      {
          if (uuid == BLE_UUID_ESCS_UNLOCK_CHAR)
          {
              err_code = es_gatts_read_handle_unlock(p_escs);
              APP_ERROR_CHECK(err_code);
          }
  
          else
          {
              err_code = es_gatts_read_handle_locked_read(p_escs, uuid, m_lock_state);
              APP_ERROR_CHECK(err_code);
          }
      }
  }
  
  
  ret_code_t es_gatts_init(nrf_ble_escs_t * p_ble_escs)
  {
      VERIFY_PARAM_NOT_NULL(p_ble_escs);
  
      m_active_slot = 0;
      m_lock_state  = NRF_BLE_ESCS_LOCK_STATE_LOCKED;
  
      p_ble_escs->p_active_slot = &m_active_slot;
      p_ble_escs->p_lock_state  = &m_lock_state;
  
      return NRF_SUCCESS;
  }
  