text: /*
   * Copyright (c) 2018, JANET(UK)
   * 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 JANET(UK) 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 HOLDERS 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.
   *
   */
  
  
  #include <talloc.h>
  #include <jansson.h>
  
  #include <mon_internal.h>
  
  /* Monitoring response decoder */
  
  /**
   * Decode a JSON response
   *
   * Expected format:
   * {
   *   "code": 0,
   *   "message": "success",
   *   "payload": {
   *     "serial": 12345,
   *     ...
   *   }
   * }
   *
   * Caller must free the return value with MON_REQ_free().
   *
   * @param mem_ctx talloc context for the returned struct
   * @param resp_json reference to JSON request object
   * @return decoded request struct or NULL on failure
   */
  void *mon_resp_decode(TALLOC_CTX *mem_ctx, json_t *resp_json)
  {
    TALLOC_CTX *tmp_ctx = talloc_new(NULL);
    MON_RESP *resp = NULL;
    json_t *jcode = NULL;
    json_t *jmessage = NULL;
    json_t *jpayload = NULL;
  
    if (! json_is_object(resp_json))
      goto cleanup;
  
    /* Get the response code, which is an integer */
    jcode = json_object_get(resp_json, "code");
    if (! json_is_integer(jcode))
      goto cleanup;
  
    /* Get the response message, which is a string */
    jmessage = json_object_get(resp_json, "message");
    if (! json_is_string(jmessage))
      goto cleanup;
  
    /* Get the payload if we have one */
    jpayload = json_object_get(resp_json, "payload");
  
    /* Get a response in the tmp_ctx context. The payload may be null. */
    resp = mon_resp_new(tmp_ctx,
                        (MON_RESP_CODE) json_integer_value(jcode),
                        json_string_value(jmessage),
                        jpayload);
    if (resp == NULL)
      goto cleanup;
  
    /* Success! Put the request in the caller's talloc context */
    talloc_steal(mem_ctx, resp);
  
  cleanup:
    talloc_free(tmp_ctx);
    if (resp_json)
      json_decref(resp_json);
  
    return resp;
  }
  