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using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
namespace StardewModdingAPI.Web.Framework.UserAgentParsing
{
/// <summary>Middleware that detects the client's platform.</summary>
public class ClientPlatformMiddleware
{
/// <summary>The key used to retrieve the client's platform from <see cref="HttpContext.Items"/>.</summary>
public const string ClientPlatformKey = "ClientPlatformKey";
/// <summary>The next delegate in the middleware pipeline.</summary>
private readonly RequestDelegate Next;
/// <summary>Construct an instance.</summary>
/// <param name="next">The next delegate in the middleware pipeline.</param>
public ClientPlatformMiddleware(RequestDelegate next)
{
this.Next = next;
}
/// <summary>Invoke the middleware.</summary>
/// <param name="context">The HTTP request context.</param>
public async Task InvokeAsync(HttpContext context)
{
context.Items[ClientPlatformMiddleware.ClientPlatformKey] = this.DetectClientPlatform(context.Request.Headers["User-Agent"]);
await this.Next(context);
}
/// <summary>Detect the platform that the client is on.</summary>
/// <param name="userAgent">The client's user agent.</param>
/// <returns>The client's platform, or null if no platforms could be detected.</returns>
private Platform? DetectClientPlatform(string userAgent)
{
switch (userAgent)
{
case string ua when ua.Contains("Windows"):
return Platform.Windows;
// check for Android before Linux because Android user agents also contain Linux
case string ua when ua.Contains("Android"):
return Platform.Android;
case string ua when ua.Contains("Linux"):
return Platform.Linux;
case string ua when ua.Contains("Mac"):
return Platform.Mac;
default:
return null;
}
}
}
}
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