101 lines
4 KiB
C#
101 lines
4 KiB
C#
using System.Globalization;
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using System.Net;
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using System.Text;
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using System.Xml;
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using System.Xml.Linq;
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using Microsoft.AspNetCore.Mvc;
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using Microsoft.AspNetCore.OutputCaching;
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using Microsoft.EntityFrameworkCore;
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using Microsoft.Extensions.Options;
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using Wave.Data;
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using Wave.Utilities;
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namespace Wave.Controllers;
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[ApiController]
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public class SitemapController(ApplicationDbContext context, IOptions<Features> features) : ControllerBase {
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private ApplicationDbContext Context { get; } = context;
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private Features Features { get; } = features.Value;
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[HttpGet("/sitemap.xml")]
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[Produces("application/xml")]
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[ResponseCache(Duration = 60*15, Location = ResponseCacheLocation.Any)]
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[OutputCache(Duration = 60*15)]
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public async Task GetSitemapAsync(CancellationToken cancellation) {
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var host = new Uri($"https://{Request.Host}{Request.PathBase}", UriKind.Absolute);
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var articles = await Context.Set<Article>().OrderBy(a => a.PublishDate).ToListAsync(cancellation);
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var categories = await Context.Set<Category>().Where(c => c.Articles.Any())
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.OrderBy(c => c.Color).ThenBy(c => c.Id)
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.Select(c => new {c.Name, LastModified = c.Articles.Max(a => a.PublishDate)}).ToListAsync(cancellation);
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var profiles = await Context.Set<ApplicationUser>().Where(a => a.Articles.Any())
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.OrderBy(a => a.Id)
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.Select(a => new {a.Id, LastModified = a.Articles.Max(ar => ar.PublishDate)})
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.ToListAsync(cancellation);
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var document = new XDocument {
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Declaration = new XDeclaration("1.0", Encoding.UTF8.ToString(), null),
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};
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XNamespace nameSpace = "http://www.sitemaps.org/schemas/sitemap/0.9";
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var root = new XElement(nameSpace + "urlset");
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if (articles.Count > 0) {
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root.Add(CreateUrlElement(nameSpace, host, articles.Max(a => a.PublishDate).UtcDateTime, ChangeFrequencies.Daily, 1.0f));
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foreach (var article in articles) {
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root.Add(CreateUrlElement(nameSpace,
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new Uri(ArticleUtilities.GenerateArticleLink(article, host)),
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article.LastPublicChange.UtcDateTime, priority:0.8f));
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}
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} else {
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root.Add(CreateUrlElement(nameSpace, host, DateTimeOffset.Now.UtcDateTime, ChangeFrequencies.Daily, 1.0f));
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}
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foreach (var category in categories) {
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root.Add(CreateUrlElement(nameSpace,
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new Uri(host, "/category/" + WebUtility.UrlEncode(category.Name)),
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category.LastModified.UtcDateTime, priority:0.2f));
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}
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foreach (var profile in profiles) {
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root.Add(CreateUrlElement(nameSpace,
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new Uri(host, "/profile/" + profile.Id),
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profile.LastModified.UtcDateTime, ChangeFrequencies.Weekly, 0.6f));
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}
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root.Add(CreateUrlElement(nameSpace, new Uri(host, "/Account/Login")));
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if (Features.NativeSignup) root.Add(CreateUrlElement(nameSpace, new Uri(host, "/Account/Register")));
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if (Features.EmailSubscriptions) root.Add(CreateUrlElement(nameSpace, new Uri(host, "/Email/Subscribe")));
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document.Add(root);
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Response.StatusCode = StatusCodes.Status200OK;
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Response.ContentType = "application/xml; charset=utf-8";
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await using var writer = XmlWriter.Create(Response.Body, new XmlWriterSettings {
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Encoding = Encoding.UTF8,
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Async = true, Indent = true
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});
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await document.SaveAsync(writer, cancellation);
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await writer.FlushAsync();
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}
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private static XElement CreateUrlElement(XNamespace nameSpace, Uri location, DateTime? lastModified = null, ChangeFrequencies changeFrequency = ChangeFrequencies.Unknown, float priority = 0.5f) {
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var result = new XElement(nameSpace + "url", new XElement(nameSpace + "loc", location.AbsoluteUri));
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if (lastModified is not null) result.Add(new XElement(nameSpace + "lastmod", lastModified.Value.ToString("yyyy-MM-dd")));
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if (changeFrequency is not ChangeFrequencies.Unknown) result.Add(new XElement(nameSpace + "changefreq", changeFrequency.ToString().ToLower()));
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if (Math.Abs(priority - 0.5f) > 0.05) result.Add(new XElement(nameSpace + "priority", priority.ToString("F1", CultureInfo.InvariantCulture)));
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return result;
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}
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private enum ChangeFrequencies {
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Unknown,
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Never,
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Always,
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Hourly,
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Daily,
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Weekly,
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Monthly,
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Yearly
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}
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} |