private object GenerateInstance(string typePrefix, string name, HashSet <string> acceptableEmptyArgs, JsonDocument documentBody = null)
{
Type t = Type.GetType(typePrefix + name);
if (t == null)
{
throw new HttpException(HttpStatusCode.BadRequest, String.Format("Requested type {0} is not not recognized.", typePrefix + name));
}
var arg_list = new List <Object> {
};
// we are deliberately assuming here that there will only be a single constructor
var ctor = t.GetConstructors()[0];
var paramsSet = ctor.GetParameters();
// walk across our constructor params. check inside the body for a resulting value for each of them
foreach (var param in paramsSet)
{
if (documentBody != null && documentBody.RootElement.TryGetProperty(param.Name, out var jsonElement))
{
if (DebugLogger.CheckLogLevel(LogLevel.Debug))
{
_logger.LogDebug("Request Body Content" + JsonSerializer.Serialize(documentBody.RootElement));
}
object argumentValue = null;
switch (jsonElement.ValueKind)
{
case JsonValueKind.Null:
case JsonValueKind.String:
argumentValue = jsonElement.GetString();
break;
case JsonValueKind.True:
case JsonValueKind.False:
argumentValue = jsonElement.GetBoolean();
break;
case JsonValueKind.Object:
try
{
argumentValue = Activator.CreateInstance(param.ParameterType, new List <object> {
jsonElement
}.ToArray());
}
catch (Exception e)
{
if (e.InnerException is HttpException)
{
throw e.InnerException;
}
else
{
throw;
}
}
break;
default:
throw new HttpException(HttpStatusCode.BadRequest, $"{jsonElement.ValueKind} parameters are not supported");
}
if (argumentValue == null || (argumentValue is string stringResult && string.IsNullOrEmpty(stringResult)))
{
if (!acceptableEmptyArgs.Contains(param.Name))
{
throw new HttpException(HttpStatusCode.BadRequest, $"Parameter {param.Name} was passed with no value. Please check the request body and try again.");
}
}
arg_list.Add((object)argumentValue);
}
else
{
if (param.IsOptional)
{
arg_list.Add(param.DefaultValue);
}
else
{
throw new HttpException(HttpStatusCode.BadRequest, $"Required parameter key {param} was not found in the request body.");
}
}
}
try
{
return(Activator.CreateInstance(t, arg_list.ToArray()));
}
catch (Exception e)
{
if (e.InnerException is HttpException)
{
throw e.InnerException;
}
else
{
throw;
}
}
}
