2017-02-13 01:07:48 +00:00
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using System;
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using System.Collections.Generic;
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using System.Reflection;
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2017-05-22 04:54:02 +00:00
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using System.Threading;
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2017-02-13 01:07:48 +00:00
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using System.Threading.Tasks;
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using Emby.Server.Implementations.HttpServer;
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using MediaBrowser.Model.Logging;
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using MediaBrowser.Model.Services;
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namespace Emby.Server.Implementations.Services
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{
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public class ServiceHandler
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{
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public async Task<object> HandleResponseAsync(object response)
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{
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var taskResponse = response as Task;
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if (taskResponse == null)
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{
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return response;
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}
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await taskResponse.ConfigureAwait(false);
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var taskResult = GetTaskResult(taskResponse);
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var subTask = taskResult as Task;
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if (subTask != null)
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{
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taskResult = GetTaskResult(subTask);
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}
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return taskResult;
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}
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internal static object GetTaskResult(Task task)
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{
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try
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{
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var taskObject = task as Task<object>;
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if (taskObject != null)
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{
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return taskObject.Result;
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}
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task.Wait();
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var type = task.GetType().GetTypeInfo();
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if (!type.IsGenericType)
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{
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return null;
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}
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return type.GetDeclaredProperty("Result").GetValue(task);
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}
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catch (TypeAccessException)
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{
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return null; //return null for void Task's
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}
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}
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2017-02-13 02:06:54 +00:00
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protected static object CreateContentTypeRequest(HttpListenerHost host, IRequest httpReq, Type requestType, string contentType)
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2017-02-13 01:07:48 +00:00
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{
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if (!string.IsNullOrEmpty(contentType) && httpReq.ContentLength > 0)
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{
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2017-02-13 02:06:54 +00:00
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var deserializer = RequestHelper.GetRequestReader(host, contentType);
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2017-02-13 01:07:48 +00:00
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if (deserializer != null)
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{
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return deserializer(requestType, httpReq.InputStream);
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}
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}
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2017-02-13 02:06:54 +00:00
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return host.CreateInstance(requestType);
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2017-02-13 01:07:48 +00:00
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}
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public static RestPath FindMatchingRestPath(string httpMethod, string pathInfo, ILogger logger, out string contentType)
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{
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pathInfo = GetSanitizedPathInfo(pathInfo, out contentType);
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return ServiceController.Instance.GetRestPathForRequest(httpMethod, pathInfo, logger);
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}
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public static string GetSanitizedPathInfo(string pathInfo, out string contentType)
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{
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contentType = null;
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var pos = pathInfo.LastIndexOf('.');
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if (pos >= 0)
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{
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var format = pathInfo.Substring(pos + 1);
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contentType = GetFormatContentType(format);
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if (contentType != null)
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{
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pathInfo = pathInfo.Substring(0, pos);
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}
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}
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return pathInfo;
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}
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private static string GetFormatContentType(string format)
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{
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//built-in formats
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if (format == "json")
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return "application/json";
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if (format == "xml")
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return "application/xml";
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return null;
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}
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public RestPath GetRestPath(string httpMethod, string pathInfo)
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{
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if (this.RestPath == null)
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{
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string contentType;
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this.RestPath = FindMatchingRestPath(httpMethod, pathInfo, new NullLogger(), out contentType);
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if (contentType != null)
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ResponseContentType = contentType;
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}
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return this.RestPath;
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}
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public RestPath RestPath { get; set; }
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// Set from SSHHF.GetHandlerForPathInfo()
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public string ResponseContentType { get; set; }
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2017-05-22 04:54:02 +00:00
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public async Task ProcessRequestAsync(HttpListenerHost appHost, IRequest httpReq, IResponse httpRes, ILogger logger, string operationName, CancellationToken cancellationToken)
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2017-02-13 01:07:48 +00:00
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{
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var restPath = GetRestPath(httpReq.Verb, httpReq.PathInfo);
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if (restPath == null)
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{
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throw new NotSupportedException("No RestPath found for: " + httpReq.Verb + " " + httpReq.PathInfo);
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}
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SetRoute(httpReq, restPath);
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if (ResponseContentType != null)
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httpReq.ResponseContentType = ResponseContentType;
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2017-02-13 02:06:54 +00:00
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var request = httpReq.Dto = CreateRequest(appHost, httpReq, restPath, logger);
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2017-02-13 01:07:48 +00:00
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appHost.ApplyRequestFilters(httpReq, httpRes, request);
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var rawResponse = await appHost.ServiceController.Execute(appHost, request, httpReq).ConfigureAwait(false);
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var response = await HandleResponseAsync(rawResponse).ConfigureAwait(false);
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// Apply response filters
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2017-02-13 02:06:54 +00:00
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foreach (var responseFilter in appHost.ResponseFilters)
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2017-02-13 01:07:48 +00:00
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{
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responseFilter(httpReq, httpRes, response);
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}
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2017-05-22 04:54:02 +00:00
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await ResponseHelper.WriteToResponse(httpRes, httpReq, response, cancellationToken).ConfigureAwait(false);
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2017-02-13 01:07:48 +00:00
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}
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2017-02-13 02:06:54 +00:00
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public static object CreateRequest(HttpListenerHost host, IRequest httpReq, RestPath restPath, ILogger logger)
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2017-02-13 01:07:48 +00:00
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{
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var requestType = restPath.RequestType;
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if (RequireqRequestStream(requestType))
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{
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// Used by IRequiresRequestStream
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2017-02-13 02:06:54 +00:00
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return CreateRequiresRequestStreamRequest(host, httpReq, requestType);
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2017-02-13 01:07:48 +00:00
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}
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var requestParams = GetFlattenedRequestParams(httpReq);
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2017-02-13 02:06:54 +00:00
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return CreateRequest(host, httpReq, restPath, requestParams);
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2017-02-13 01:07:48 +00:00
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}
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private static bool RequireqRequestStream(Type requestType)
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{
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var requiresRequestStreamTypeInfo = typeof(IRequiresRequestStream).GetTypeInfo();
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return requiresRequestStreamTypeInfo.IsAssignableFrom(requestType.GetTypeInfo());
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}
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2017-02-13 02:06:54 +00:00
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private static IRequiresRequestStream CreateRequiresRequestStreamRequest(HttpListenerHost host, IRequest req, Type requestType)
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2017-02-13 01:07:48 +00:00
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{
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var restPath = GetRoute(req);
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2017-02-13 02:06:54 +00:00
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var request = ServiceHandler.CreateRequest(req, restPath, GetRequestParams(req), host.CreateInstance(requestType));
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2017-02-13 01:07:48 +00:00
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var rawReq = (IRequiresRequestStream)request;
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rawReq.RequestStream = req.InputStream;
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return rawReq;
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}
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2017-02-13 02:06:54 +00:00
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public static object CreateRequest(HttpListenerHost host, IRequest httpReq, RestPath restPath, Dictionary<string, string> requestParams)
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2017-02-13 01:07:48 +00:00
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{
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2017-02-13 02:06:54 +00:00
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var requestDto = CreateContentTypeRequest(host, httpReq, restPath.RequestType, httpReq.ContentType);
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2017-02-13 01:07:48 +00:00
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return CreateRequest(httpReq, restPath, requestParams, requestDto);
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}
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public static object CreateRequest(IRequest httpReq, RestPath restPath, Dictionary<string, string> requestParams, object requestDto)
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{
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string contentType;
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var pathInfo = !restPath.IsWildCardPath
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? GetSanitizedPathInfo(httpReq.PathInfo, out contentType)
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: httpReq.PathInfo;
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return restPath.CreateRequest(pathInfo, requestParams, requestDto);
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}
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/// <summary>
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/// Duplicate Params are given a unique key by appending a #1 suffix
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/// </summary>
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private static Dictionary<string, string> GetRequestParams(IRequest request)
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{
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var map = new Dictionary<string, string>();
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foreach (var name in request.QueryString.Keys)
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{
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if (name == null) continue; //thank you ASP.NET
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var values = request.QueryString.GetValues(name);
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if (values.Length == 1)
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{
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map[name] = values[0];
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}
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else
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{
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for (var i = 0; i < values.Length; i++)
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{
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map[name + (i == 0 ? "" : "#" + i)] = values[i];
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}
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}
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}
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if ((IsMethod(request.Verb, "POST") || IsMethod(request.Verb, "PUT")) && request.FormData != null)
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{
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foreach (var name in request.FormData.Keys)
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{
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if (name == null) continue; //thank you ASP.NET
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var values = request.FormData.GetValues(name);
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if (values.Length == 1)
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{
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map[name] = values[0];
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}
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else
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{
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for (var i = 0; i < values.Length; i++)
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{
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map[name + (i == 0 ? "" : "#" + i)] = values[i];
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}
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}
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}
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}
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return map;
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}
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private static bool IsMethod(string method, string expected)
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{
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return string.Equals(method, expected, StringComparison.OrdinalIgnoreCase);
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}
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/// <summary>
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/// Duplicate params have their values joined together in a comma-delimited string
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/// </summary>
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private static Dictionary<string, string> GetFlattenedRequestParams(IRequest request)
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{
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var map = new Dictionary<string, string>();
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foreach (var name in request.QueryString.Keys)
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{
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if (name == null) continue; //thank you ASP.NET
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map[name] = request.QueryString[name];
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}
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if ((IsMethod(request.Verb, "POST") || IsMethod(request.Verb, "PUT")) && request.FormData != null)
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{
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foreach (var name in request.FormData.Keys)
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{
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if (name == null) continue; //thank you ASP.NET
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map[name] = request.FormData[name];
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}
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}
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return map;
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}
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private static void SetRoute(IRequest req, RestPath route)
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{
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req.Items["__route"] = route;
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}
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private static RestPath GetRoute(IRequest req)
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{
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object route;
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req.Items.TryGetValue("__route", out route);
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return route as RestPath;
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}
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}
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}
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