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using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Emby.Server.Implementations.HttpServer;
using MediaBrowser.Model.Services;
namespace Emby.Server.Implementations.Services
{
public static class ResponseHelper
{
public static Task WriteToResponse(IResponse httpRes, IRequest httpReq, object result)
{
if (result == null)
{
if (httpRes.StatusCode == (int)HttpStatusCode.OK)
{
httpRes.StatusCode = (int)HttpStatusCode.NoContent;
}
httpRes.SetContentLength(0);
return Task.FromResult(true);
}
var httpResult = result as IHttpResult;
if (httpResult != null)
{
httpResult.RequestContext = httpReq;
httpReq.ResponseContentType = httpResult.ContentType ?? httpReq.ResponseContentType;
return WriteToResponseInternal(httpRes, httpResult, httpReq);
}
return WriteToResponseInternal(httpRes, result, httpReq);
}
/// <summary>
/// Writes to response.
/// Response headers are customizable by implementing IHasHeaders an returning Dictionary of Http headers.
/// </summary>
/// <param name="response">The response.</param>
/// <param name="result">Whether or not it was implicity handled by ServiceStack's built-in handlers.</param>
/// <param name="request">The serialization context.</param>
/// <returns></returns>
private static async Task WriteToResponseInternal(IResponse response, object result, IRequest request)
{
var defaultContentType = request.ResponseContentType;
var httpResult = result as IHttpResult;
if (httpResult != null)
{
if (httpResult.RequestContext == null)
httpResult.RequestContext = request;
response.StatusCode = httpResult.Status;
response.StatusDescription = httpResult.StatusCode.ToString();
if (string.IsNullOrEmpty(httpResult.ContentType))
{
httpResult.ContentType = defaultContentType;
}
response.ContentType = httpResult.ContentType;
if (httpResult.Cookies != null)
{
var httpRes = response as IHttpResponse;
if (httpRes != null)
{
foreach (var cookie in httpResult.Cookies)
{
httpRes.SetCookie(cookie);
}
}
}
}
var responseOptions = result as IHasHeaders;
if (responseOptions != null)
{
foreach (var responseHeaders in responseOptions.Headers)
{
if (string.Equals(responseHeaders.Key, "Content-Length", StringComparison.OrdinalIgnoreCase))
{
response.SetContentLength(long.Parse(responseHeaders.Value));
continue;
}
response.AddHeader(responseHeaders.Key, responseHeaders.Value);
}
}
//ContentType='text/html' is the default for a HttpResponse
//Do not override if another has been set
if (response.ContentType == null || response.ContentType == "text/html")
{
response.ContentType = defaultContentType;
}
if (new HashSet<string> { "application/json", }.Contains(response.ContentType))
{
response.ContentType += "; charset=utf-8";
}
var asyncStreamWriter = result as IAsyncStreamWriter;
if (asyncStreamWriter != null)
{
await asyncStreamWriter.WriteToAsync(response.OutputStream, CancellationToken.None).ConfigureAwait(false);
return;
}
var streamWriter = result as IStreamWriter;
if (streamWriter != null)
{
streamWriter.WriteTo(response.OutputStream);
return;
}
var fileWriter = result as FileWriter;
if (fileWriter != null)
{
await fileWriter.WriteToAsync(response, CancellationToken.None).ConfigureAwait(false);
return;
}
var stream = result as Stream;
if (stream != null)
{
using (stream)
{
await stream.CopyToAsync(response.OutputStream).ConfigureAwait(false);
return;
}
}
var bytes = result as byte[];
if (bytes != null)
{
response.ContentType = "application/octet-stream";
response.SetContentLength(bytes.Length);
await response.OutputStream.WriteAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
return;
}
var responseText = result as string;
if (responseText != null)
{
bytes = Encoding.UTF8.GetBytes(responseText);
response.SetContentLength(bytes.Length);
await response.OutputStream.WriteAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
return;
}
await WriteObject(request, result, response).ConfigureAwait(false);
}
public static async Task WriteObject(IRequest request, object result, IResponse response)
{
var contentType = request.ResponseContentType;
var serializer = RequestHelper.GetResponseWriter(HttpListenerHost.Instance, contentType);
using (var ms = new MemoryStream())
{
serializer(result, ms);
ms.Position = 0;
response.SetContentLength(ms.Length);
await ms.CopyToAsync(response.OutputStream).ConfigureAwait(false);
}
//serializer(result, outputStream);
}
}
}
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