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#pragma warning disable CS1591
using System;
using System.Globalization;
using System.IO;
using System.Net.Http;
using System.Net.Mime;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading;
using System.Threading.Tasks;
using System.Xml;
using System.Xml.Linq;
using Emby.Dlna.Common;
using MediaBrowser.Common.Net;
using Microsoft.Extensions.Logging;
namespace Emby.Dlna.PlayTo
{
/// <summary>
/// Http client for Dlna PlayTo function.
/// </summary>
public partial class DlnaHttpClient
{
private readonly ILogger _logger;
private readonly IHttpClientFactory _httpClientFactory;
public DlnaHttpClient(ILogger logger, IHttpClientFactory httpClientFactory)
{
_logger = logger;
_httpClientFactory = httpClientFactory;
}
private static string NormalizeServiceUrl(string baseUrl, string serviceUrl)
{
// If it's already a complete url, don't stick anything onto the front of it
if (serviceUrl.StartsWith("http", StringComparison.OrdinalIgnoreCase))
{
return serviceUrl;
}
if (!serviceUrl.StartsWith('/'))
{
serviceUrl = "/" + serviceUrl;
}
return baseUrl + serviceUrl;
}
private async Task<XDocument?> SendRequestAsync(HttpRequestMessage request, CancellationToken cancellationToken)
{
var client = _httpClientFactory.CreateClient(NamedClient.Dlna);
using var response = await client.SendAsync(request, cancellationToken).ConfigureAwait(false);
response.EnsureSuccessStatusCode();
await using MemoryStream ms = new MemoryStream();
await response.Content.CopyToAsync(ms, cancellationToken).ConfigureAwait(false);
try
{
return await XDocument.LoadAsync(
ms,
LoadOptions.None,
cancellationToken).ConfigureAwait(false);
}
catch (XmlException)
{
// try correcting the Xml response with common errors
ms.Position = 0;
using StreamReader sr = new StreamReader(ms);
var xmlString = await sr.ReadToEndAsync(cancellationToken).ConfigureAwait(false);
// find and replace unescaped ampersands (&)
xmlString = EscapeAmpersandRegex().Replace(xmlString, "&");
try
{
// retry reading Xml
using var xmlReader = new StringReader(xmlString);
return await XDocument.LoadAsync(
xmlReader,
LoadOptions.None,
cancellationToken).ConfigureAwait(false);
}
catch (XmlException ex)
{
_logger.LogError(ex, "Failed to parse response");
_logger.LogDebug("Malformed response: {Content}\n", xmlString);
return null;
}
}
}
public async Task<XDocument?> GetDataAsync(string url, CancellationToken cancellationToken)
{
using var request = new HttpRequestMessage(HttpMethod.Get, url);
// Have to await here instead of returning the Task directly, otherwise request would be disposed too soon
return await SendRequestAsync(request, cancellationToken).ConfigureAwait(false);
}
public async Task<XDocument?> SendCommandAsync(
string baseUrl,
DeviceService service,
string command,
string postData,
string? header = null,
CancellationToken cancellationToken = default)
{
using var request = new HttpRequestMessage(HttpMethod.Post, NormalizeServiceUrl(baseUrl, service.ControlUrl))
{
Content = new StringContent(postData, Encoding.UTF8, MediaTypeNames.Text.Xml)
};
request.Headers.TryAddWithoutValidation(
"SOAPACTION",
string.Format(
CultureInfo.InvariantCulture,
"\"{0}#{1}\"",
service.ServiceType,
command));
request.Headers.Pragma.ParseAdd("no-cache");
if (!string.IsNullOrEmpty(header))
{
request.Headers.TryAddWithoutValidation("contentFeatures.dlna.org", header);
}
// Have to await here instead of returning the Task directly, otherwise request would be disposed too soon
return await SendRequestAsync(request, cancellationToken).ConfigureAwait(false);
}
/// <summary>
/// Compile-time generated regular expression for escaping ampersands.
/// </summary>
/// <returns>Compiled regular expression.</returns>
[GeneratedRegex("(&(?![a-z]*;))")]
private static partial Regex EscapeAmpersandRegex();
}
}
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