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using System;
using System.Collections.Generic;
using System.Reflection;
using System.Threading;
using System.Threading.Tasks;
using Emby.Server.Implementations.HttpServer;
using MediaBrowser.Model.Services;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
namespace Emby.Server.Implementations.Services
{
public class ServiceHandler
{
private RestPath _restPath;
private string _responseContentType;
internal ServiceHandler(RestPath restPath, string responseContentType)
{
_restPath = restPath;
_responseContentType = responseContentType;
}
protected static Task<object> CreateContentTypeRequest(HttpListenerHost host, IRequest httpReq, Type requestType, string contentType)
{
if (!string.IsNullOrEmpty(contentType) && httpReq.ContentLength > 0)
{
var deserializer = RequestHelper.GetRequestReader(host, contentType);
if (deserializer != null)
{
return deserializer.Invoke(requestType, httpReq.InputStream);
}
}
return Task.FromResult(host.CreateInstance(requestType));
}
public static string GetSanitizedPathInfo(string pathInfo, out string contentType)
{
contentType = null;
var pos = pathInfo.LastIndexOf('.');
if (pos != -1)
{
var format = pathInfo.Substring(pos + 1);
contentType = GetFormatContentType(format);
if (contentType != null)
{
pathInfo = pathInfo.Substring(0, pos);
}
}
return pathInfo;
}
private static string GetFormatContentType(string format)
{
// built-in formats
switch (format)
{
case "json": return "application/json";
case "xml": return "application/xml";
default: return null;
}
}
public async Task ProcessRequestAsync(HttpListenerHost httpHost, IRequest httpReq, HttpResponse httpRes, ILogger logger, CancellationToken cancellationToken)
{
httpReq.Items["__route"] = _restPath;
if (_responseContentType != null)
{
httpReq.ResponseContentType = _responseContentType;
}
var request = await CreateRequest(httpHost, httpReq, _restPath, logger).ConfigureAwait(false);
httpHost.ApplyRequestFilters(httpReq, httpRes, request);
var response = await httpHost.ServiceController.Execute(httpHost, request, httpReq).ConfigureAwait(false);
// Apply response filters
foreach (var responseFilter in httpHost.ResponseFilters)
{
responseFilter(httpReq, httpRes, response);
}
await ResponseHelper.WriteToResponse(httpRes, httpReq, response, cancellationToken).ConfigureAwait(false);
}
public static async Task<object> CreateRequest(HttpListenerHost host, IRequest httpReq, RestPath restPath, ILogger logger)
{
var requestType = restPath.RequestType;
if (RequireqRequestStream(requestType))
{
// Used by IRequiresRequestStream
var requestParams = GetRequestParams(httpReq.Response.HttpContext.Request);
var request = ServiceHandler.CreateRequest(httpReq, restPath, requestParams, host.CreateInstance(requestType));
var rawReq = (IRequiresRequestStream)request;
rawReq.RequestStream = httpReq.InputStream;
return rawReq;
}
else
{
var requestParams = GetFlattenedRequestParams(httpReq.Response.HttpContext.Request);
var requestDto = await CreateContentTypeRequest(host, httpReq, restPath.RequestType, httpReq.ContentType).ConfigureAwait(false);
return CreateRequest(httpReq, restPath, requestParams, requestDto);
}
}
public static bool RequireqRequestStream(Type requestType)
{
var requiresRequestStreamTypeInfo = typeof(IRequiresRequestStream).GetTypeInfo();
return requiresRequestStreamTypeInfo.IsAssignableFrom(requestType.GetTypeInfo());
}
public static object CreateRequest(IRequest httpReq, RestPath restPath, Dictionary<string, string> requestParams, object requestDto)
{
var pathInfo = !restPath.IsWildCardPath
? GetSanitizedPathInfo(httpReq.PathInfo, out _)
: httpReq.PathInfo;
return restPath.CreateRequest(pathInfo, requestParams, requestDto);
}
/// <summary>
/// Duplicate Params are given a unique key by appending a #1 suffix
/// </summary>
private static Dictionary<string, string> GetRequestParams(HttpRequest request)
{
var map = new Dictionary<string, string>();
foreach (var pair in request.Query)
{
var values = pair.Value;
if (values.Count == 1)
{
map[pair.Key] = values[0];
}
else
{
for (var i = 0; i < values.Count; i++)
{
map[pair.Key + (i == 0 ? string.Empty : "#" + i)] = values[i];
}
}
}
if ((IsMethod(request.Method, "POST") || IsMethod(request.Method, "PUT"))
&& request.HasFormContentType)
{
foreach (var pair in request.Form)
{
var values = pair.Value;
if (values.Count == 1)
{
map[pair.Key] = values[0];
}
else
{
for (var i = 0; i < values.Count; i++)
{
map[pair.Key + (i == 0 ? string.Empty : "#" + i)] = values[i];
}
}
}
}
return map;
}
private static bool IsMethod(string method, string expected)
=> string.Equals(method, expected, StringComparison.OrdinalIgnoreCase);
/// <summary>
/// Duplicate params have their values joined together in a comma-delimited string
/// </summary>
private static Dictionary<string, string> GetFlattenedRequestParams(HttpRequest request)
{
var map = new Dictionary<string, string>();
foreach (var pair in request.Query)
{
map[pair.Key] = pair.Value;
}
if ((IsMethod(request.Method, "POST") || IsMethod(request.Method, "PUT"))
&& request.HasFormContentType)
{
foreach (var pair in request.Form)
{
map[pair.Key] = pair.Value;
}
}
return map;
}
}
}
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