/// <summary>
/// To Add Metadata from request header,
/// It will take device id from request header and header key values in json formate of keys defined in configuration
/// </summary>
/// <param name="request">HttpRequest with metadata information in header</param>
/// <param name="metaDataService">Metadata service</param>
/// <returns></returns>
public static void AddMetaDataAsync(this HttpRequestMessage request, IMetaDataService metaDataService)
{
Task.Run(async() =>
{
//Metdata entity object to insert in database
MetaData metadata = new MetaData();
metadata.TimeStamp = DateTime.UtcNow;
//Find DeviceId Supplied in HttpRequest header if not null assign to metadata object
var deviceID = request.Headers.Contains("DeviceId") ? request.Headers.GetValues("DeviceId") : null;
if (deviceID != null)
{
deviceID = deviceID.ToList();
metadata.SetValue("DeviceId", deviceID.FirstOrDefault());
}
///Dictionary to save key value from header and convert it to json and save in metadata
var payloadPairs = new Dictionary <string, string>();
//Loop throgh each keys saved in setting.json as Headers
foreach (string key in PayLoadKeys)
{
//If httpRequest header contains that key with value insert it into dictionary
var value = request.Headers.Contains(key) ? request.Headers.GetValues(key) : null;
if (value != null)
{
value = value.ToList();
payloadPairs.Add(key, value.FirstOrDefault());
}
}
//If there is one or more key value pair exist in header assign it to metadata.Payload property as json data
if (payloadPairs.Count > 0)
{
metadata.SetValue("Payload", JsonConvert.SerializeObject(payloadPairs));
}
//If DeviceId is assigned from header insert metadata object to database using metaDataService
if (!string.IsNullOrEmpty(metadata.DeviceId))
{
await metaDataService.InsertMetaDataAsync(metadata);
}
});
}