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using System;
using System.Threading.Tasks;
using Jellyfin.Networking.Configuration;
using MediaBrowser.Controller.Configuration;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;
using static MediaBrowser.Controller.Extensions.ConfigurationExtensions;
namespace Jellyfin.Api.Middleware;
/// <summary>
/// Redirect requests without baseurl prefix to the baseurl prefixed URL.
/// </summary>
public class BaseUrlRedirectionMiddleware
{
private readonly RequestDelegate _next;
private readonly ILogger<BaseUrlRedirectionMiddleware> _logger;
private readonly IConfiguration _configuration;
/// <summary>
/// Initializes a new instance of the <see cref="BaseUrlRedirectionMiddleware"/> class.
/// </summary>
/// <param name="next">The next delegate in the pipeline.</param>
/// <param name="logger">The logger.</param>
/// <param name="configuration">The application configuration.</param>
public BaseUrlRedirectionMiddleware(
RequestDelegate next,
ILogger<BaseUrlRedirectionMiddleware> logger,
IConfiguration configuration)
{
_next = next;
_logger = logger;
_configuration = configuration;
}
/// <summary>
/// Executes the middleware action.
/// </summary>
/// <param name="httpContext">The current HTTP context.</param>
/// <param name="serverConfigurationManager">The server configuration manager.</param>
/// <returns>The async task.</returns>
public async Task Invoke(HttpContext httpContext, IServerConfigurationManager serverConfigurationManager)
{
var localPath = httpContext.Request.Path.ToString();
var baseUrlPrefix = serverConfigurationManager.GetNetworkConfiguration().BaseUrl;
if (string.IsNullOrEmpty(localPath)
|| string.Equals(localPath, baseUrlPrefix, StringComparison.OrdinalIgnoreCase)
|| string.Equals(localPath, baseUrlPrefix + "/", StringComparison.OrdinalIgnoreCase)
|| string.Equals(localPath, baseUrlPrefix + "/web", StringComparison.OrdinalIgnoreCase)
|| string.Equals(localPath, baseUrlPrefix + "/web/", StringComparison.OrdinalIgnoreCase)
|| !localPath.StartsWith(baseUrlPrefix, StringComparison.OrdinalIgnoreCase)
)
{
// Redirect health endpoint
if (string.Equals(localPath, "/health", StringComparison.OrdinalIgnoreCase)
|| string.Equals(localPath, "/health/", StringComparison.OrdinalIgnoreCase))
{
_logger.LogDebug("Redirecting /health check");
httpContext.Response.Redirect(baseUrlPrefix + "/health");
return;
}
// Always redirect back to the default path if the base prefix is invalid or missing
_logger.LogDebug("Normalizing an URL at {LocalPath}", localPath);
var port = httpContext.Request.Host.Port ?? -1;
var uri = new UriBuilder(httpContext.Request.Scheme, httpContext.Request.Host.Host, port, localPath).Uri;
var redirectUri = new UriBuilder(httpContext.Request.Scheme, httpContext.Request.Host.Host, port, baseUrlPrefix + "/" + _configuration[DefaultRedirectKey]).Uri;
var target = uri.MakeRelativeUri(redirectUri).ToString();
_logger.LogDebug("Redirecting to {Target}", target);
httpContext.Response.Redirect(target);
return;
}
await _next(httpContext).ConfigureAwait(false);
}
}
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