Added infrastructure for sitemap generator

Author: linkdotnet

LinkDotNet.Blog.Web/Pages/Admin/Sitemap.razor

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+@page "/Sitemap"
+@using LinkDotNet.Blog.Web.Shared.Services.Sitemap
+@inject ISitemapService sitemapService
+
+<div class="row">
+    <button class="btn btn-primary" @onclick="CreateSitemap">Create Sitemap</button>
+
+    @if (urlSet != null)
+    {
+        <table class="table table-striped table-hover">
+            <tbody>
+            <tr>
+                <th>Url</th>
+                <th>Last Changed</th>
+            </tr>
+            @foreach (var url in urlSet.Urls)
+            {
+                <tr>
+                    <td>@url.Location</td>
+                    <td>@url.LastModified</td>
+                </tr>
+            }
+            </tbody>
+        </table>
+    }
+</div>
+
+@code {
+    private UrlSet urlSet;
+
+    private async Task CreateSitemap()
+    {
+        urlSet = await sitemapService.CreateSitemapAsync();
+    }
+}

LinkDotNet.Blog.Web/Shared/Services/Sitemap/ISitemapService.cs

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+using System.Threading.Tasks;
+
+namespace LinkDotNet.Blog.Web.Shared.Services.Sitemap
+{
+    public interface ISitemapService
+    {
+        Task<UrlSet> CreateSitemapAsync();
+    }
+}

LinkDotNet.Blog.Web/Shared/Services/Sitemap/SitemapService.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using LinkDotNet.Blog.Domain;
+using LinkDotNet.Blog.Infrastructure.Persistence;
+using Microsoft.AspNetCore.Components;
+
+namespace LinkDotNet.Blog.Web.Shared.Services.Sitemap
+{
+    public class SitemapService : ISitemapService
+    {
+        private readonly IRepository<BlogPost> repository;
+        private readonly NavigationManager navigationManager;
+
+        public SitemapService(
+            IRepository<BlogPost> repository,
+            NavigationManager navigationManager)
+        {
+            this.repository = repository;
+            this.navigationManager = navigationManager;
+        }
+
+        public async Task<UrlSet> CreateSitemapAsync()
+        {
+            const string sitemapNamespace = "http://www.sitemaps.org/schemas/sitemap/0.9";
+            var urlSet = new UrlSet
+            {
+                Namespace = sitemapNamespace,
+            };
+
+            var blogPosts = (await repository.GetAllAsync(f => f.IsPublished, b => b.UpdatedDate)).ToList();
+
+            urlSet.Urls.Add(new Url { Location = navigationManager.BaseUri });
+            urlSet.Urls.AddRange(CreateUrlsForBlogPosts(blogPosts));
+            urlSet.Urls.AddRange(CreateUrlsForTags(blogPosts));
+
+            return urlSet;
+        }
+
+        private IEnumerable<Url> CreateUrlsForBlogPosts(IEnumerable<BlogPost> blogPosts)
+        {
+            return blogPosts.Select(b => new Url
+            {
+                Location = $"{navigationManager.BaseUri}blogPosts/{b.Id}",
+                LastModified = b.UpdatedDate.ToString("yyyy-MM-dd"),
+            }).ToList();
+        }
+
+        private IEnumerable<Url> CreateUrlsForTags(IEnumerable<BlogPost> blogPosts)
+        {
+            return blogPosts
+                .SelectMany(b => b.Tags)
+                .Select(t => t.Content)
+                .Distinct()
+                .Select(t => new Url
+                {
+                    Location = $"{navigationManager.BaseUri}searchByTag/{Uri.EscapeDataString(t)}",
+                });
+        }
+    }
+}

LinkDotNet.Blog.Web/Shared/Services/Sitemap/Url.cs

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+using System.Xml.Serialization;
+
+namespace LinkDotNet.Blog.Web.Shared.Services.Sitemap
+{
+    [XmlRoot(ElementName="url")]
+    public class Url
+    {
+        [XmlElement(ElementName="loc")]
+        public string Location { get; set; }
+
+        [XmlElement(ElementName="lastmod")]
+        public string LastModified { get; set; }
+    }
+}

LinkDotNet.Blog.Web/Shared/Services/Sitemap/UrlSet.cs

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+using System.Collections.Generic;
+using System.Xml.Serialization;
+
+namespace LinkDotNet.Blog.Web.Shared.Services.Sitemap
+{
+    [XmlRoot(ElementName="urlset")]
+    public class UrlSet
+    {
+        [XmlElement(ElementName = "url")]
+        public List<Url> Urls { get; set; } = new();
+
+        [XmlAttribute(AttributeName="xmlns")]
+        public string Namespace { get; set; }
+    }
+}