/*
 *
 * Copyright 2015 gRPC authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#include <grpc/support/port_platform.h>

#include "src/core/lib/iomgr/error.h"
#include "src/core/lib/security/util/json_util.h"

#include <string.h>

#include <grpc/support/log.h>
#include <grpc/support/string_util.h>

const char* grpc_json_get_string_property(const grpc_json* json,
                                          const char* prop_name,
                                          grpc_error** error) {
  grpc_json* child = nullptr;
  if (error != nullptr) *error = GRPC_ERROR_NONE;
  for (child = json->child; child != nullptr; child = child->next) {
    if (child->key == nullptr) {
      if (error != nullptr) {
        *error = GRPC_ERROR_CREATE_FROM_STATIC_STRING(
            "Invalid (null) JSON key encountered");
      }
      return nullptr;
    }
    if (strcmp(child->key, prop_name) == 0) break;
  }
  if (child == nullptr || child->type != GRPC_JSON_STRING) {
    if (error != nullptr) {
      char* error_msg;
      gpr_asprintf(&error_msg, "Invalid or missing %s property.", prop_name);
      *error = GRPC_ERROR_CREATE_FROM_COPIED_STRING(error_msg);
      gpr_free(error_msg);
    }
    return nullptr;
  }
  return child->value;
}

bool grpc_copy_json_string_property(const grpc_json* json,
                                    const char* prop_name,
                                    char** copied_value) {
  grpc_error* error = GRPC_ERROR_NONE;
  const char* prop_value =
      grpc_json_get_string_property(json, prop_name, &error);
  GRPC_LOG_IF_ERROR("Could not copy JSON property", error);
  if (prop_value == nullptr) return false;
  *copied_value = gpr_strdup(prop_value);
  return true;
}