I am trying to create a custom JSONMediaTypeFormatter in which posts some json parameters to a webapi call. I need to encrypt the returned data from the webapi, hence writing a custom mediatypeformatter.
In my webapiconfig I clear all formatters and only add the custom formatter.
config.Formatters.Clear();
config.Formatters.Add(new CipherMediaFormatter());
In my custom media type formatter I add in the relevant headers and types but i still cant call my web api. It gives me an error
No MediaTypeFormatter is available to read an object of type 'Param' from content with media type 'application/json
The code for the mediatypeformatter
public class CipherMediaFormatter : JsonMediaTypeFormatter
{
private static Type _supportedType = typeof(object);
public CipherMediaFormatter()
{
this.SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/octet-stream"));
this.SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/html"));
this.SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/json"));
}
public override void SetDefaultContentHeaders(Type type, HttpContentHeaders headers, MediaTypeHeaderValue mediaType)
{
base.SetDefaultContentHeaders(type, headers, mediaType);
headers.ContentType = new MediaTypeHeaderValue("application/json");
}
public override bool CanReadType(Type type)
{
return true;
}
public override bool CanWriteType(Type type)
{
return true;
}
public override Task<object> ReadFromStreamAsync(Type type, Stream readStream, HttpContent content, IFormatterLogger formatterLogger)
{
var taskSource = new TaskCompletionSource<object>();
try
{
var ms = new MemoryStream();
readStream.CopyTo(ms);
taskSource.SetResult(ms.ToArray());
}
catch (Exception e)
{
taskSource.SetException(e);
}
return taskSource.Task;
}
public override Task WriteToStreamAsync(Type type, object value, Stream writeStream, HttpContent content, TransportContext transportContext)
{
var taskSource = new TaskCompletionSource<object>();
try
{
if (value != null)
{
var jsonData = JsonConvert.SerializeObject(value);
ICryptographicService cgService = new CryptographicService();
string apiKey = string.Empty;
string pattern = @"api\/(.*)?\/(\d+)?";
var match = Regex.Match(HttpContext.Current.Request.RawUrl, pattern);
....
}
}
catch (Exception e)
{
taskSource.SetException(e);
}
return taskSource.Task;
}
}
