94 lines
3.5 KiB
C#
94 lines
3.5 KiB
C#
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using System.Diagnostics.CodeAnalysis;
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using System.Xml.Serialization;
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using Microsoft.EntityFrameworkCore;
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using OliverBooth.Data;
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using OliverBooth.Data.Blog;
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using OliverBooth.Data.Rss;
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using OliverBooth.Services;
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namespace OliverBooth.Middleware;
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/// <summary>
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/// Represents the RSS middleware.
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/// </summary>
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internal sealed class RssMiddleware
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{
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private readonly BlogService _blogService;
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private readonly ConfigurationService _configurationService;
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/// <summary>
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/// Initializes a new instance of the <see cref="RssMiddleware" /> class.
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/// </summary>
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/// <param name="_">The request delegate.</param>
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/// <param name="blogService">The blog service.</param>
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/// <param name="configurationService">The configuration service.</param>
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public RssMiddleware(RequestDelegate _,
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BlogService blogService,
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ConfigurationService configurationService)
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{
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_blogService = blogService;
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_configurationService = configurationService;
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}
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[SuppressMessage("Performance", "CA1822:Mark members as static", Justification = "Middleware")]
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public async Task Invoke(HttpContext context)
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{
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context.Response.ContentType = "application/rss+xml";
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var baseUrl = $"https://{context.Request.Host}/blog";
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var blogItems = new List<BlogItem>();
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foreach (BlogPost blogPost in _blogService.AllPosts.OrderByDescending(p => p.Published))
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{
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var url = $"{baseUrl}/{blogPost.Published:yyyy/MM/dd}/{blogPost.Slug}";
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string excerpt = _blogService.GetExcerpt(blogPost, out _);
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var description = $"{excerpt}<p><a href=\"{url}\">Read more...</a></p>";
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_blogService.TryGetAuthor(blogPost, out Author? author);
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var item = new BlogItem
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{
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Title = blogPost.Title,
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Link = url,
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Comments = $"{url}#disqus_thread",
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Creator = author?.Name ?? string.Empty,
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PubDate = blogPost.Published.ToString("R"),
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Guid = $"{baseUrl}?pid={blogPost.Id}",
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Description = description
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};
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blogItems.Add(item);
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}
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string siteTitle = _configurationService.GetSiteConfiguration("SiteTitle") ?? string.Empty;
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var rss = new BlogRoot
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{
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Channel = new BlogChannel
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{
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AtomLink = new AtomLink
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{
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Href = $"{baseUrl}/feed/",
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},
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Description = $"{baseUrl}/",
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LastBuildDate = DateTimeOffset.UtcNow.ToString("R"),
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Link = $"{baseUrl}/",
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Title = siteTitle,
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Generator = $"{baseUrl}/",
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Items = blogItems
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}
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};
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var serializer = new XmlSerializer(typeof(BlogRoot));
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var xmlNamespaces = new XmlSerializerNamespaces();
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xmlNamespaces.Add("content", "http://purl.org/rss/1.0/modules/content/");
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xmlNamespaces.Add("wfw", "http://wellformedweb.org/CommentAPI/");
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xmlNamespaces.Add("dc", "http://purl.org/dc/elements/1.1/");
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xmlNamespaces.Add("atom", "http://www.w3.org/2005/Atom");
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xmlNamespaces.Add("sy", "http://purl.org/rss/1.0/modules/syndication/");
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xmlNamespaces.Add("slash", "http://purl.org/rss/1.0/modules/slash/");
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await using var writer = new StreamWriter(context.Response.BodyWriter.AsStream());
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serializer.Serialize(writer, rss, xmlNamespaces);
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// await context.Response.WriteAsync(document.OuterXml);
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}
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}
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