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// Example Using Kendo FileSaver
// npm install --save @progress/kendo-file-saver
import { saveAs, encodeBase64 } from '@progress/kendo-file-saver';

const dataURI = "data:text/plain;base64," + encodeBase64("Hello World!");
saveAs(dataURI, "test.txt", {
    proxyURL: "/path/to/proxy",
    forceProxy: true
});

public class SaveFile : ApiController
{
    public class FileData
    {
        public string ContentType { get; set; }
        public string Base64 { get; set; }
        public string FileName { get; set; }
    }

    // POST api/savefile
    public HttpResponseMessage Post([FromBody]FileData file)
    {
        var data = Convert.FromBase64String(file.Base64);

        var result = new HttpResponseMessage(HttpStatusCode.OK)
        {
            Content = new StreamContent(new MemoryStream(data))
        };

        result.Content.Headers.ContentType = new MediaTypeHeaderValue(file.ContentType);

        result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
        {
            FileName = file.FileName
        };

        return result;
    }
}