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SitemapMiddlewareBase.cs
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SitemapMiddlewareBase.cs
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using Microsoft.AspNetCore.Http;
using System;
using System.IO;
using System.Text;
using System.Threading.Tasks;
namespace Arex388.AspNetCore {
public abstract class SitemapMiddlewareBase {
protected RequestDelegate Next { get; }
protected SitemapMiddlewareBase(
RequestDelegate next) => Next = next ?? throw new ArgumentNullException(nameof(next));
public async Task InvokeAsync(
HttpContext context,
ISitemapServices services) {
if (context.Request.Path.Value != "/sitemap.xml") {
await Next(context).ConfigureAwait(false);
return;
}
var sitemap = await InvokeInternalAsync(services).ConfigureAwait(false);
var response = context.Response;
var stream = response.Body;
response.ContentType = "application/xml";
response.StatusCode = 200;
await using var memoryStream = new MemoryStream();
var bytes = Encoding.UTF8.GetBytes(sitemap);
await memoryStream.WriteAsync(bytes.AsMemory(0, bytes.Length)).ConfigureAwait(false);
memoryStream.Seek(0, SeekOrigin.Begin);
await memoryStream.CopyToAsync(stream, bytes.Length).ConfigureAwait(false);
}
protected abstract Task<string> InvokeInternalAsync(
ISitemapServices services);
}
}