651 lines
23 KiB
C#
651 lines
23 KiB
C#
using System;
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using System.Collections.Concurrent;
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using System.IO;
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using System.Linq;
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using System.Net;
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using System.Net.Http;
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using System.Net.Http.Headers;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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using MediaBrowser.Common.Configuration;
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using MediaBrowser.Common.Extensions;
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using MediaBrowser.Common.Net;
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using MediaBrowser.Model.IO;
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using MediaBrowser.Model.Net;
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using Microsoft.Extensions.Logging;
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using Microsoft.Net.Http.Headers;
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namespace Emby.Server.Implementations.HttpClientManager
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{
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/// <summary>
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/// Class HttpClientManager
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/// </summary>
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public class HttpClientManager : IHttpClient
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{
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/// <summary>
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/// When one request to a host times out, we'll ban all other requests for this period of time, to prevent scans from stalling
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/// </summary>
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private const int TimeoutSeconds = 30;
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/// <summary>
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/// The _logger
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/// </summary>
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private readonly ILogger _logger;
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/// <summary>
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/// The _app paths
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/// </summary>
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private readonly IApplicationPaths _appPaths;
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private readonly IFileSystem _fileSystem;
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private readonly Func<string> _defaultUserAgentFn;
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/// <summary>
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/// Initializes a new instance of the <see cref="HttpClientManager" /> class.
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/// </summary>
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public HttpClientManager(
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IApplicationPaths appPaths,
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ILoggerFactory loggerFactory,
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IFileSystem fileSystem,
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Func<string> defaultUserAgentFn)
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{
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if (appPaths == null)
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{
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throw new ArgumentNullException(nameof(appPaths));
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}
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if (loggerFactory == null)
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{
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throw new ArgumentNullException(nameof(loggerFactory));
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}
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_logger = loggerFactory.CreateLogger(nameof(HttpClientManager));
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_fileSystem = fileSystem;
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_appPaths = appPaths;
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_defaultUserAgentFn = defaultUserAgentFn;
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// http://stackoverflow.com/questions/566437/http-post-returns-the-error-417-expectation-failed-c
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ServicePointManager.Expect100Continue = false;
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}
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/// <summary>
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/// Holds a dictionary of http clients by host. Use GetHttpClient(host) to retrieve or create a client for web requests.
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/// DON'T dispose it after use.
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/// </summary>
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/// <value>The HTTP clients.</value>
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private readonly ConcurrentDictionary<string, HttpClient> _httpClients = new ConcurrentDictionary<string, HttpClient>();
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/// <summary>
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/// Gets
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/// </summary>
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/// <param name="url">The host.</param>
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/// <param name="enableHttpCompression">if set to <c>true</c> [enable HTTP compression].</param>
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/// <returns>HttpClient.</returns>
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/// <exception cref="ArgumentNullException">host</exception>
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private HttpClient GetHttpClient(string url, bool enableHttpCompression)
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{
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var key = GetHostFromUrl(url) + enableHttpCompression;
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if (!_httpClients.TryGetValue(key, out var client))
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{
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client = new HttpClient()
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{
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BaseAddress = new Uri(url)
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};
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_httpClients.TryAdd(key, client);
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}
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return client;
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}
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private HttpRequestMessage GetRequestMessage(HttpRequestOptions options, HttpMethod method)
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{
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string url = options.Url;
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var uriAddress = new Uri(url);
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string userInfo = uriAddress.UserInfo;
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if (!string.IsNullOrWhiteSpace(userInfo))
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{
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_logger.LogWarning("Found userInfo in url: {0} ... url: {1}", userInfo, url);
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url = url.Replace(userInfo + "@", string.Empty);
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}
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var request = new HttpRequestMessage(method, url);
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AddRequestHeaders(request, options);
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if (options.EnableHttpCompression)
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{
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if (options.DecompressionMethod.HasValue
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&& options.DecompressionMethod.Value == CompressionMethod.Gzip)
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{
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request.Headers.Add(HeaderNames.AcceptEncoding, new[] { "gzip", "deflate" });
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}
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else
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{
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request.Headers.Add(HeaderNames.AcceptEncoding, "deflate");
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}
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}
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if (options.EnableKeepAlive)
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{
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request.Headers.Add(HeaderNames.Connection, "Keep-Alive");
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}
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if (!string.IsNullOrEmpty(options.Host))
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{
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request.Headers.Add(HeaderNames.Host, options.Host);
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}
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if (!string.IsNullOrEmpty(options.Referer))
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{
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request.Headers.Add(HeaderNames.Referer, options.Referer);
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}
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//request.Headers.Add(HeaderNames.CacheControl, "no-cache");
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//request.Headers.Add(HeaderNames., options.TimeoutMs;
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/*
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if (!string.IsNullOrWhiteSpace(userInfo))
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{
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var parts = userInfo.Split(':');
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if (parts.Length == 2)
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{
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request.Headers.Add(HeaderNames., GetCredential(url, parts[0], parts[1]);
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}
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}
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*/
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return request;
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}
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private void AddRequestHeaders(HttpRequestMessage request, HttpRequestOptions options)
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{
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var hasUserAgent = false;
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foreach (var header in options.RequestHeaders)
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{
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if (string.Equals(header.Key, HeaderNames.UserAgent, StringComparison.OrdinalIgnoreCase))
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{
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hasUserAgent = true;
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}
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request.Headers.Add(header.Key, header.Value);
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}
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if (!hasUserAgent && options.EnableDefaultUserAgent)
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{
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request.Headers.Add(HeaderNames.UserAgent, _defaultUserAgentFn());
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}
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}
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/// <summary>
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/// Gets the response internal.
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/// </summary>
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/// <param name="options">The options.</param>
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/// <returns>Task{HttpResponseInfo}.</returns>
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public Task<HttpResponseInfo> GetResponse(HttpRequestOptions options)
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{
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return SendAsync(options, HttpMethod.Get);
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}
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/// <summary>
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/// Performs a GET request and returns the resulting stream
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/// </summary>
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/// <param name="options">The options.</param>
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/// <returns>Task{Stream}.</returns>
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public async Task<Stream> Get(HttpRequestOptions options)
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{
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var response = await GetResponse(options).ConfigureAwait(false);
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return response.Content;
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}
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/// <summary>
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/// send as an asynchronous operation.
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/// </summary>
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/// <param name="options">The options.</param>
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/// <param name="httpMethod">The HTTP method.</param>
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/// <returns>Task{HttpResponseInfo}.</returns>
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/// <exception cref="HttpException">
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/// </exception>
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public Task<HttpResponseInfo> SendAsync(HttpRequestOptions options, string httpMethod)
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{
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var httpMethod2 = GetHttpMethod(httpMethod);
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return SendAsync(options, httpMethod2);
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}
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/// <summary>
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/// send as an asynchronous operation.
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/// </summary>
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/// <param name="options">The options.</param>
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/// <param name="httpMethod">The HTTP method.</param>
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/// <returns>Task{HttpResponseInfo}.</returns>
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/// <exception cref="HttpException">
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/// </exception>
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public async Task<HttpResponseInfo> SendAsync(HttpRequestOptions options, HttpMethod httpMethod)
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{
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if (options.CacheMode == CacheMode.None)
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{
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return await SendAsyncInternal(options, httpMethod).ConfigureAwait(false);
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}
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var url = options.Url;
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var urlHash = url.ToLowerInvariant().GetMD5().ToString("N");
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var responseCachePath = Path.Combine(_appPaths.CachePath, "httpclient", urlHash);
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var response = GetCachedResponse(responseCachePath, options.CacheLength, url);
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if (response != null)
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{
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return response;
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}
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response = await SendAsyncInternal(options, httpMethod).ConfigureAwait(false);
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if (response.StatusCode == HttpStatusCode.OK)
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{
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await CacheResponse(response, responseCachePath).ConfigureAwait(false);
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}
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return response;
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}
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private HttpMethod GetHttpMethod(string httpMethod)
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{
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if (httpMethod.Equals("DELETE", StringComparison.OrdinalIgnoreCase))
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{
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return HttpMethod.Delete;
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}
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else if (httpMethod.Equals("GET", StringComparison.OrdinalIgnoreCase))
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{
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return HttpMethod.Get;
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}
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else if (httpMethod.Equals("HEAD", StringComparison.OrdinalIgnoreCase))
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{
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return HttpMethod.Head;
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}
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else if (httpMethod.Equals("OPTIONS", StringComparison.OrdinalIgnoreCase))
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{
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return HttpMethod.Options;
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}
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else if (httpMethod.Equals("POST", StringComparison.OrdinalIgnoreCase))
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{
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return HttpMethod.Post;
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}
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else if (httpMethod.Equals("PUT", StringComparison.OrdinalIgnoreCase))
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{
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return HttpMethod.Put;
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}
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else if (httpMethod.Equals("TRACE", StringComparison.OrdinalIgnoreCase))
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{
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return HttpMethod.Trace;
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}
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throw new ArgumentException("Invalid HTTP method", nameof(httpMethod));
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}
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private HttpResponseInfo GetCachedResponse(string responseCachePath, TimeSpan cacheLength, string url)
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{
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if (File.Exists(responseCachePath)
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&& _fileSystem.GetLastWriteTimeUtc(responseCachePath).Add(cacheLength) > DateTime.UtcNow)
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{
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var stream = _fileSystem.GetFileStream(responseCachePath, FileOpenMode.Open, FileAccessMode.Read, FileShareMode.Read, true);
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return new HttpResponseInfo
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{
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ResponseUrl = url,
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Content = stream,
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StatusCode = HttpStatusCode.OK,
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ContentLength = stream.Length
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};
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}
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return null;
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}
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private async Task CacheResponse(HttpResponseInfo response, string responseCachePath)
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{
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Directory.CreateDirectory(Path.GetDirectoryName(responseCachePath));
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using (var fileStream = _fileSystem.GetFileStream(responseCachePath, FileOpenMode.Create, FileAccessMode.Write, FileShareMode.None, true))
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{
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await response.Content.CopyToAsync(fileStream).ConfigureAwait(false);
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response.Content.Position = 0;
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}
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}
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private async Task<HttpResponseInfo> SendAsyncInternal(HttpRequestOptions options, HttpMethod httpMethod)
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{
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ValidateParams(options);
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options.CancellationToken.ThrowIfCancellationRequested();
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var client = GetHttpClient(options.Url, options.EnableHttpCompression);
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var httpWebRequest = GetRequestMessage(options, httpMethod);
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if (options.RequestContentBytes != null ||
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!string.IsNullOrEmpty(options.RequestContent) ||
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httpMethod == HttpMethod.Post)
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{
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try
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{
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httpWebRequest.Content = new StringContent(Encoding.UTF8.GetString(options.RequestContentBytes) ?? options.RequestContent ?? string.Empty);
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var contentType = options.RequestContentType ?? "application/x-www-form-urlencoded";
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if (options.AppendCharsetToMimeType)
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{
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contentType = contentType.TrimEnd(';') + "; charset=\"utf-8\"";
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}
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httpWebRequest.Headers.Add(HeaderNames.ContentType, contentType);
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await client.SendAsync(httpWebRequest).ConfigureAwait(false);
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}
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catch (Exception ex)
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{
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throw new HttpException(ex.Message) { IsTimedOut = true };
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}
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}
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if (options.LogRequest)
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{
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_logger.LogDebug("HttpClientManager {0}: {1}", httpMethod.ToString(), options.Url);
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}
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try
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{
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options.CancellationToken.ThrowIfCancellationRequested();
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/*if (!options.BufferContent)
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{
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var response = await client.HttpClient.SendAsync(httpWebRequest).ConfigureAwait(false);
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await EnsureSuccessStatusCode(client, response, options).ConfigureAwait(false);
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options.CancellationToken.ThrowIfCancellationRequested();
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return GetResponseInfo(response, await response.Content.ReadAsStreamAsync().ConfigureAwait(false), response.Content.Headers.ContentLength, response);
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}*/
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using (var response = await client.SendAsync(httpWebRequest).ConfigureAwait(false))
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{
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await EnsureSuccessStatusCode(response, options).ConfigureAwait(false);
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options.CancellationToken.ThrowIfCancellationRequested();
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using (var stream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false))
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{
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var memoryStream = new MemoryStream();
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await stream.CopyToAsync(memoryStream).ConfigureAwait(false);
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memoryStream.Position = 0;
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return GetResponseInfo(response, memoryStream, memoryStream.Length, null);
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}
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}
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}
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catch (OperationCanceledException ex)
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{
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throw GetCancellationException(options, options.CancellationToken, ex);
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}
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}
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private HttpResponseInfo GetResponseInfo(HttpResponseMessage httpResponse, Stream content, long? contentLength, IDisposable disposable)
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{
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var responseInfo = new HttpResponseInfo(disposable)
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{
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Content = content,
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StatusCode = httpResponse.StatusCode,
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ContentType = httpResponse.Content.Headers.ContentType?.MediaType,
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ContentLength = contentLength,
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ResponseUrl = httpResponse.Content.Headers.ContentLocation?.ToString()
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};
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if (httpResponse.Headers != null)
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{
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SetHeaders(httpResponse.Content.Headers, responseInfo);
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}
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return responseInfo;
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}
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private HttpResponseInfo GetResponseInfo(HttpResponseMessage httpResponse, string tempFile, long? contentLength)
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{
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var responseInfo = new HttpResponseInfo
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{
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TempFilePath = tempFile,
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StatusCode = httpResponse.StatusCode,
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ContentType = httpResponse.Content.Headers.ContentType?.MediaType,
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ContentLength = contentLength
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};
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if (httpResponse.Headers != null)
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{
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SetHeaders(httpResponse.Content.Headers, responseInfo);
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}
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return responseInfo;
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}
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private static void SetHeaders(HttpContentHeaders headers, HttpResponseInfo responseInfo)
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{
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foreach (var key in headers)
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{
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responseInfo.Headers[key.Key] = string.Join(", ", key.Value);
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}
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}
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public Task<HttpResponseInfo> Post(HttpRequestOptions options)
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{
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return SendAsync(options, HttpMethod.Post);
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}
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/// <summary>
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/// Downloads the contents of a given url into a temporary location
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/// </summary>
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/// <param name="options">The options.</param>
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/// <returns>Task{System.String}.</returns>
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public async Task<string> GetTempFile(HttpRequestOptions options)
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{
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using (var response = await GetTempFileResponse(options).ConfigureAwait(false))
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{
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return response.TempFilePath;
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}
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}
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public async Task<HttpResponseInfo> GetTempFileResponse(HttpRequestOptions options)
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{
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ValidateParams(options);
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Directory.CreateDirectory(_appPaths.TempDirectory);
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var tempFile = Path.Combine(_appPaths.TempDirectory, Guid.NewGuid() + ".tmp");
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if (options.Progress == null)
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{
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throw new ArgumentException("Options did not have a Progress value.", nameof(options));
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}
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options.CancellationToken.ThrowIfCancellationRequested();
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var httpWebRequest = GetRequestMessage(options, HttpMethod.Get);
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options.Progress.Report(0);
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if (options.LogRequest)
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{
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_logger.LogDebug("HttpClientManager.GetTempFileResponse url: {0}", options.Url);
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}
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var client = GetHttpClient(options.Url, options.EnableHttpCompression);
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try
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{
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options.CancellationToken.ThrowIfCancellationRequested();
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using (var response = (await client.SendAsync(httpWebRequest).ConfigureAwait(false)))
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{
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await EnsureSuccessStatusCode(response, options).ConfigureAwait(false);
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options.CancellationToken.ThrowIfCancellationRequested();
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using (var stream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false))
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using (var fs = _fileSystem.GetFileStream(tempFile, FileOpenMode.Create, FileAccessMode.Write, FileShareMode.Read, true))
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{
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await stream.CopyToAsync(fs, StreamDefaults.DefaultCopyToBufferSize, options.CancellationToken).ConfigureAwait(false);
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}
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options.Progress.Report(100);
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var contentLength = response.Content.Headers.ContentLength;
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return GetResponseInfo(response, tempFile, contentLength);
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}
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}
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catch (Exception ex)
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{
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if (File.Exists(tempFile))
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{
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File.Delete(tempFile);
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}
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throw GetException(ex, options);
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}
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}
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private Exception GetException(Exception ex, HttpRequestOptions options)
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{
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if (ex is HttpException)
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{
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return ex;
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}
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var webException = ex as WebException
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?? ex.InnerException as WebException;
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if (webException != null)
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{
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if (options.LogErrors)
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{
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_logger.LogError(webException, "Error {status} getting response from {url}", webException.Status, options.Url);
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}
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var exception = new HttpException(webException.Message, webException);
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using (var response = webException.Response as HttpWebResponse)
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{
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if (response != null)
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{
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exception.StatusCode = response.StatusCode;
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}
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}
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if (!exception.StatusCode.HasValue)
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{
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if (webException.Status == WebExceptionStatus.NameResolutionFailure ||
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webException.Status == WebExceptionStatus.ConnectFailure)
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{
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exception.IsTimedOut = true;
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}
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}
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return exception;
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}
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var operationCanceledException = ex as OperationCanceledException
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?? ex.InnerException as OperationCanceledException;
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if (operationCanceledException != null)
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{
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return GetCancellationException(options, options.CancellationToken, operationCanceledException);
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}
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if (options.LogErrors)
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{
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_logger.LogError(ex, "Error getting response from {url}", options.Url);
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}
|
|
|
|
return ex;
|
|
}
|
|
|
|
private void ValidateParams(HttpRequestOptions options)
|
|
{
|
|
if (string.IsNullOrEmpty(options.Url))
|
|
{
|
|
throw new ArgumentNullException(nameof(options));
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the host from URL.
|
|
/// </summary>
|
|
/// <param name="url">The URL.</param>
|
|
/// <returns>System.String.</returns>
|
|
private static string GetHostFromUrl(string url)
|
|
{
|
|
var index = url.IndexOf("://", StringComparison.OrdinalIgnoreCase);
|
|
|
|
if (index != -1)
|
|
{
|
|
url = url.Substring(index + 3);
|
|
var host = url.Split(new[] { '/' }, StringSplitOptions.RemoveEmptyEntries).FirstOrDefault();
|
|
|
|
if (!string.IsNullOrWhiteSpace(host))
|
|
{
|
|
return host;
|
|
}
|
|
}
|
|
|
|
return url;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Throws the cancellation exception.
|
|
/// </summary>
|
|
/// <param name="options">The options.</param>
|
|
/// <param name="cancellationToken">The cancellation token.</param>
|
|
/// <param name="exception">The exception.</param>
|
|
/// <returns>Exception.</returns>
|
|
private Exception GetCancellationException(HttpRequestOptions options, CancellationToken cancellationToken, OperationCanceledException exception)
|
|
{
|
|
// If the HttpClient's timeout is reached, it will cancel the Task internally
|
|
if (!cancellationToken.IsCancellationRequested)
|
|
{
|
|
var msg = string.Format("Connection to {0} timed out", options.Url);
|
|
|
|
if (options.LogErrors)
|
|
{
|
|
_logger.LogError(msg);
|
|
}
|
|
|
|
// Throw an HttpException so that the caller doesn't think it was cancelled by user code
|
|
return new HttpException(msg, exception)
|
|
{
|
|
IsTimedOut = true
|
|
};
|
|
}
|
|
|
|
return exception;
|
|
}
|
|
|
|
private async Task EnsureSuccessStatusCode(HttpResponseMessage response, HttpRequestOptions options)
|
|
{
|
|
if (response.IsSuccessStatusCode)
|
|
{
|
|
return;
|
|
}
|
|
|
|
var msg = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
|
|
_logger.LogError(msg);
|
|
|
|
throw new HttpException(response.ReasonPhrase)
|
|
{
|
|
StatusCode = response.StatusCode
|
|
};
|
|
}
|
|
}
|
|
}
|