using System;
using System.Collections.Concurrent;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Common.Configuration;
using MediaBrowser.Common.Extensions;
using MediaBrowser.Common.Net;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.Net;
using Microsoft.Extensions.Logging;
using Microsoft.Net.Http.Headers;
namespace Emby.Server.Implementations.HttpClientManager
{
///
/// Class HttpClientManager
///
public class HttpClientManager : IHttpClient
{
private readonly ILogger _logger;
private readonly IApplicationPaths _appPaths;
private readonly IFileSystem _fileSystem;
private readonly Func _defaultUserAgentFn;
///
/// Holds a dictionary of http clients by host. Use GetHttpClient(host) to retrieve or create a client for web requests.
/// DON'T dispose it after use.
///
/// The HTTP clients.
private readonly ConcurrentDictionary _httpClients = new ConcurrentDictionary();
///
/// Initializes a new instance of the class.
///
public HttpClientManager(
IApplicationPaths appPaths,
ILogger logger,
IFileSystem fileSystem,
Func defaultUserAgentFn)
{
if (appPaths == null)
{
throw new ArgumentNullException(nameof(appPaths));
}
if (logger == null)
{
throw new ArgumentNullException(nameof(logger));
}
_logger = logger;
_fileSystem = fileSystem;
_appPaths = appPaths;
_defaultUserAgentFn = defaultUserAgentFn;
}
///
/// Gets the correct http client for the given url.
///
/// The url.
/// HttpClient.
private HttpClient GetHttpClient(string url)
{
var key = GetHostFromUrl(url);
if (!_httpClients.TryGetValue(key, out var client))
{
client = new HttpClient()
{
BaseAddress = new Uri(url)
};
_httpClients.TryAdd(key, client);
}
return client;
}
private HttpRequestMessage GetRequestMessage(HttpRequestOptions options, HttpMethod method)
{
string url = options.Url;
var uriAddress = new Uri(url);
string userInfo = uriAddress.UserInfo;
if (!string.IsNullOrWhiteSpace(userInfo))
{
_logger.LogWarning("Found userInfo in url: {0} ... url: {1}", userInfo, url);
url = url.Replace(userInfo + '@', string.Empty);
}
var request = new HttpRequestMessage(method, url);
AddRequestHeaders(request, options);
switch (options.DecompressionMethod)
{
case CompressionMethod.Deflate | CompressionMethod.Gzip:
request.Headers.Add(HeaderNames.AcceptEncoding, new[] { "gzip", "deflate" });
break;
case CompressionMethod.Deflate:
request.Headers.Add(HeaderNames.AcceptEncoding, "deflate");
break;
case CompressionMethod.Gzip:
request.Headers.Add(HeaderNames.AcceptEncoding, "gzip");
break;
default:
break;
}
if (options.EnableKeepAlive)
{
request.Headers.Add(HeaderNames.Connection, "Keep-Alive");
}
//request.Headers.Add(HeaderNames.CacheControl, "no-cache");
/*
if (!string.IsNullOrWhiteSpace(userInfo))
{
var parts = userInfo.Split(':');
if (parts.Length == 2)
{
request.Headers.Add(HeaderNames., GetCredential(url, parts[0], parts[1]);
}
}
*/
return request;
}
private void AddRequestHeaders(HttpRequestMessage request, HttpRequestOptions options)
{
var hasUserAgent = false;
foreach (var header in options.RequestHeaders)
{
if (string.Equals(header.Key, HeaderNames.UserAgent, StringComparison.OrdinalIgnoreCase))
{
hasUserAgent = true;
}
request.Headers.Add(header.Key, header.Value);
}
if (!hasUserAgent && options.EnableDefaultUserAgent)
{
request.Headers.Add(HeaderNames.UserAgent, _defaultUserAgentFn());
}
}
///
/// Gets the response internal.
///
/// The options.
/// Task{HttpResponseInfo}.
public Task GetResponse(HttpRequestOptions options)
=> SendAsync(options, HttpMethod.Get);
///
/// Performs a GET request and returns the resulting stream
///
/// The options.
/// Task{Stream}.
public async Task Get(HttpRequestOptions options)
{
var response = await GetResponse(options).ConfigureAwait(false);
return response.Content;
}
///
/// send as an asynchronous operation.
///
/// The options.
/// The HTTP method.
/// Task{HttpResponseInfo}.
public Task SendAsync(HttpRequestOptions options, string httpMethod)
{
var httpMethod2 = GetHttpMethod(httpMethod);
return SendAsync(options, httpMethod2);
}
///
/// send as an asynchronous operation.
///
/// The options.
/// The HTTP method.
/// Task{HttpResponseInfo}.
public async Task SendAsync(HttpRequestOptions options, HttpMethod httpMethod)
{
if (options.CacheMode == CacheMode.None)
{
return await SendAsyncInternal(options, httpMethod).ConfigureAwait(false);
}
var url = options.Url;
var urlHash = url.ToLowerInvariant().GetMD5().ToString("N");
var responseCachePath = Path.Combine(_appPaths.CachePath, "httpclient", urlHash);
var response = GetCachedResponse(responseCachePath, options.CacheLength, url);
if (response != null)
{
return response;
}
response = await SendAsyncInternal(options, httpMethod).ConfigureAwait(false);
if (response.StatusCode == HttpStatusCode.OK)
{
await CacheResponse(response, responseCachePath).ConfigureAwait(false);
}
return response;
}
private HttpMethod GetHttpMethod(string httpMethod)
{
if (httpMethod.Equals("DELETE", StringComparison.OrdinalIgnoreCase))
{
return HttpMethod.Delete;
}
else if (httpMethod.Equals("GET", StringComparison.OrdinalIgnoreCase))
{
return HttpMethod.Get;
}
else if (httpMethod.Equals("HEAD", StringComparison.OrdinalIgnoreCase))
{
return HttpMethod.Head;
}
else if (httpMethod.Equals("OPTIONS", StringComparison.OrdinalIgnoreCase))
{
return HttpMethod.Options;
}
else if (httpMethod.Equals("POST", StringComparison.OrdinalIgnoreCase))
{
return HttpMethod.Post;
}
else if (httpMethod.Equals("PUT", StringComparison.OrdinalIgnoreCase))
{
return HttpMethod.Put;
}
else if (httpMethod.Equals("TRACE", StringComparison.OrdinalIgnoreCase))
{
return HttpMethod.Trace;
}
throw new ArgumentException("Invalid HTTP method", nameof(httpMethod));
}
private HttpResponseInfo GetCachedResponse(string responseCachePath, TimeSpan cacheLength, string url)
{
if (File.Exists(responseCachePath)
&& _fileSystem.GetLastWriteTimeUtc(responseCachePath).Add(cacheLength) > DateTime.UtcNow)
{
var stream = _fileSystem.GetFileStream(responseCachePath, FileOpenMode.Open, FileAccessMode.Read, FileShareMode.Read, true);
return new HttpResponseInfo
{
ResponseUrl = url,
Content = stream,
StatusCode = HttpStatusCode.OK,
ContentLength = stream.Length
};
}
return null;
}
private async Task CacheResponse(HttpResponseInfo response, string responseCachePath)
{
Directory.CreateDirectory(Path.GetDirectoryName(responseCachePath));
using (var fileStream = _fileSystem.GetFileStream(responseCachePath, FileOpenMode.Create, FileAccessMode.Write, FileShareMode.None, true))
{
await response.Content.CopyToAsync(fileStream).ConfigureAwait(false);
response.Content.Position = 0;
}
}
private async Task SendAsyncInternal(HttpRequestOptions options, HttpMethod httpMethod)
{
ValidateParams(options);
options.CancellationToken.ThrowIfCancellationRequested();
var client = GetHttpClient(options.Url);
var httpWebRequest = GetRequestMessage(options, httpMethod);
if (options.RequestContentBytes != null
|| !string.IsNullOrEmpty(options.RequestContent)
|| httpMethod == HttpMethod.Post)
{
if (options.RequestContentBytes != null)
{
httpWebRequest.Content = new ByteArrayContent(options.RequestContentBytes);
}
else if (options.RequestContent != null)
{
httpWebRequest.Content = new StringContent(options.RequestContent);
}
else
{
httpWebRequest.Content = new ByteArrayContent(Array.Empty());
}
// TODO: add correct content type
/*
var contentType = options.RequestContentType ?? "application/x-www-form-urlencoded";
if (options.AppendCharsetToMimeType)
{
contentType = contentType.TrimEnd(';') + "; charset=\"utf-8\"";
}
httpWebRequest.Headers.Add(HeaderNames.ContentType, contentType);*/
}
if (options.LogRequest)
{
_logger.LogDebug("HttpClientManager {0}: {1}", httpMethod.ToString(), options.Url);
}
options.CancellationToken.ThrowIfCancellationRequested();
if (!options.BufferContent)
{
var response = await client.SendAsync(httpWebRequest, options.CancellationToken).ConfigureAwait(false);
await EnsureSuccessStatusCode(response, options).ConfigureAwait(false);
options.CancellationToken.ThrowIfCancellationRequested();
var stream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false);
return new HttpResponseInfo(response.Headers, response.Content.Headers)
{
Content = stream,
StatusCode = response.StatusCode,
ContentType = response.Content.Headers.ContentType?.MediaType,
ContentLength = stream.Length,
ResponseUrl = response.Content.Headers.ContentLocation?.ToString()
};
}
using (var response = await client.SendAsync(httpWebRequest, options.CancellationToken).ConfigureAwait(false))
{
await EnsureSuccessStatusCode(response, options).ConfigureAwait(false);
options.CancellationToken.ThrowIfCancellationRequested();
using (var stream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false))
{
var memoryStream = new MemoryStream();
await stream.CopyToAsync(memoryStream, StreamDefaults.DefaultCopyToBufferSize, options.CancellationToken).ConfigureAwait(false);
memoryStream.Position = 0;
return new HttpResponseInfo(response.Headers, response.Content.Headers)
{
Content = memoryStream,
StatusCode = response.StatusCode,
ContentType = response.Content.Headers.ContentType?.MediaType,
ContentLength = memoryStream.Length,
ResponseUrl = response.Content.Headers.ContentLocation?.ToString()
};
}
}
}
public Task Post(HttpRequestOptions options)
=> SendAsync(options, HttpMethod.Post);
///
/// Downloads the contents of a given url into a temporary location
///
/// The options.
/// Task{System.String}.
public async Task GetTempFile(HttpRequestOptions options)
{
var response = await GetTempFileResponse(options).ConfigureAwait(false);
return response.TempFilePath;
}
public async Task GetTempFileResponse(HttpRequestOptions options)
{
ValidateParams(options);
Directory.CreateDirectory(_appPaths.TempDirectory);
var tempFile = Path.Combine(_appPaths.TempDirectory, Guid.NewGuid() + ".tmp");
if (options.Progress == null)
{
throw new ArgumentException("Options did not have a Progress value.", nameof(options));
}
options.CancellationToken.ThrowIfCancellationRequested();
var httpWebRequest = GetRequestMessage(options, HttpMethod.Get);
options.Progress.Report(0);
if (options.LogRequest)
{
_logger.LogDebug("HttpClientManager.GetTempFileResponse url: {0}", options.Url);
}
var client = GetHttpClient(options.Url);
try
{
options.CancellationToken.ThrowIfCancellationRequested();
using (var response = (await client.SendAsync(httpWebRequest, options.CancellationToken).ConfigureAwait(false)))
{
await EnsureSuccessStatusCode(response, options).ConfigureAwait(false);
options.CancellationToken.ThrowIfCancellationRequested();
using (var stream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false))
using (var fs = _fileSystem.GetFileStream(tempFile, FileOpenMode.Create, FileAccessMode.Write, FileShareMode.Read, true))
{
await stream.CopyToAsync(fs, StreamDefaults.DefaultCopyToBufferSize, options.CancellationToken).ConfigureAwait(false);
}
options.Progress.Report(100);
var responseInfo = new HttpResponseInfo(response.Headers, response.Content.Headers)
{
TempFilePath = tempFile,
StatusCode = response.StatusCode,
ContentType = response.Content.Headers.ContentType?.MediaType,
ContentLength = response.Content.Headers.ContentLength
};
return responseInfo;
}
}
catch (Exception ex)
{
if (File.Exists(tempFile))
{
File.Delete(tempFile);
}
throw GetException(ex, options);
}
}
private Exception GetException(Exception ex, HttpRequestOptions options)
{
if (ex is HttpException)
{
return ex;
}
var webException = ex as WebException
?? ex.InnerException as WebException;
if (webException != null)
{
if (options.LogErrors)
{
_logger.LogError(webException, "Error {Status} getting response from {Url}", webException.Status, options.Url);
}
var exception = new HttpException(webException.Message, webException);
using (var response = webException.Response as HttpWebResponse)
{
if (response != null)
{
exception.StatusCode = response.StatusCode;
}
}
if (!exception.StatusCode.HasValue)
{
if (webException.Status == WebExceptionStatus.NameResolutionFailure ||
webException.Status == WebExceptionStatus.ConnectFailure)
{
exception.IsTimedOut = true;
}
}
return exception;
}
var operationCanceledException = ex as OperationCanceledException
?? ex.InnerException as OperationCanceledException;
if (operationCanceledException != null)
{
return GetCancellationException(options, options.CancellationToken, operationCanceledException);
}
if (options.LogErrors)
{
_logger.LogError(ex, "Error getting response from {Url}", options.Url);
}
return ex;
}
private void ValidateParams(HttpRequestOptions options)
{
if (string.IsNullOrEmpty(options.Url))
{
throw new ArgumentNullException(nameof(options));
}
}
///
/// Gets the host from URL.
///
/// The URL.
/// System.String.
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;
}
///
/// Throws the cancellation exception.
///
/// The options.
/// The cancellation token.
/// The exception.
/// Exception.
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("HTTP request failed with message: {Message}", msg);
throw new HttpException(response.ReasonPhrase)
{
StatusCode = response.StatusCode
};
}
}
}