Add logic for sitemap collections

src/SeoToolkit.Umbraco.Site/ExampleCode/ExampleSitemapCollection.cs

@@ -0,0 +1,16 @@
+using SeoToolkit.Umbraco.Sitemap.Core.Interfaces;
+using SeoToolkit.Umbraco.Sitemap.Core.Models.Business;
+
+namespace SeoToolkit.Umbraco.Site.ExampleCode
+{
+    public class ExampleSitemapCollection : ISitemapCollectionProvider
+    {
+        public SitemapNodeItem[] GetItems()
+        {
+            return new SitemapNodeItem[]
+            {
+                new SitemapNodeItem("https://google.nl?test=true")
+            };
+        }
+    }
+}

src/SeoToolkit.Umbraco.Site/ExampleCode/StartupComposer.cs

@@ -0,0 +1,14 @@
+using SeoToolkit.Umbraco.Sitemap.Core.Collections;
+using Umbraco.Cms.Core.Composing;
+using Umbraco.Cms.Core.DependencyInjection;
+
+namespace SeoToolkit.Umbraco.Site.ExampleCode
+{
+    public class StartupComposer : IComposer
+    {
+        public void Compose(IUmbracoBuilder builder)
+        {
+            builder.SitemapCollections().Append<ExampleSitemapCollection>();
+        }
+    }
+}

src/SeoToolkit.Umbraco.Sitemap.Core/Collections/SitemapCollectionProviderCollection.cs

@@ -0,0 +1,14 @@
+using SeoToolkit.Umbraco.Sitemap.Core.Interfaces;
+using System;
+using System.Collections.Generic;
+using Umbraco.Cms.Core.Composing;
+
+namespace SeoToolkit.Umbraco.Sitemap.Core.Collections
+{
+    public class SitemapCollectionProviderCollection : BuilderCollectionBase<ISitemapCollectionProvider>
+    {
+        public SitemapCollectionProviderCollection(Func<IEnumerable<ISitemapCollectionProvider>> items) : base(items)
+        {
+        }
+    }
+}

src/SeoToolkit.Umbraco.Sitemap.Core/Collections/SitemapCollectionProviderCollectionBuilder.cs

@@ -0,0 +1,10 @@
+using SeoToolkit.Umbraco.Sitemap.Core.Interfaces;
+using Umbraco.Cms.Core.Composing;
+
+namespace SeoToolkit.Umbraco.Sitemap.Core.Collections
+{
+    public class SitemapCollectionProviderCollectionBuilder : OrderedCollectionBuilderBase<SitemapCollectionProviderCollectionBuilder, SitemapCollectionProviderCollection, ISitemapCollectionProvider>
+    {
+        protected override SitemapCollectionProviderCollectionBuilder This => this;
+    }
+}

src/SeoToolkit.Umbraco.Sitemap.Core/Collections/SitmapCollectionProviderExtensions.cs

@@ -0,0 +1,10 @@
+using Umbraco.Cms.Core.DependencyInjection;
+
+namespace SeoToolkit.Umbraco.Sitemap.Core.Collections
+{
+    public static class SitmapCollectionProviderExtensions
+    {
+        public static SitemapCollectionProviderCollectionBuilder SitemapCollections(this IUmbracoBuilder builder)
+            => builder.WithCollectionBuilder<SitemapCollectionProviderCollectionBuilder>();
+    }
+}

src/SeoToolkit.Umbraco.Sitemap.Core/Common/SitemapGenerators/SitemapGenerator.cs

@@ -12,6 +12,8 @@
 using SeoToolkit.Umbraco.Sitemap.Core.Services.SitemapService;
 using Umbraco.Cms.Core.Events;
 using Umbraco.Cms.Core.Services;
+using SeoToolkit.Umbraco.Sitemap.Core.Collections;
+using SeoToolkit.Umbraco.Sitemap.Core.Interfaces;
 
 namespace SeoToolkit.Umbraco.Sitemap.Core.Common.SitemapGenerators
 {
@@ -23,6 +25,7 @@ public class SitemapGenerator : ISitemapGenerator
         private readonly IEventAggregator _eventAggregator;
         private readonly SitemapConfig _settings;
         private readonly IVariationContextAccessor _variationContextAccessor;
+        private readonly SitemapCollectionProviderCollection _sitemapCollectionProviders;
 
         private List<string> _validAlternateCultures;
         private Dictionary<int, SitemapPageSettings> _pageTypeSettings; //Used to cache the types for the generation
@@ -35,14 +38,16 @@ public SitemapGenerator(IUmbracoContextFactory umbracoContextFactory,
             ISitemapService sitemapService,
             IPublicAccessService publicAccessService,
             IEventAggregator eventAggregator,
-            IVariationContextAccessor variationContextAccessor)
+            IVariationContextAccessor variationContextAccessor,
+            SitemapCollectionProviderCollection sitemapCollectionProviders = null)
         {
             _umbracoContextFactory = umbracoContextFactory;
             _sitemapService = sitemapService;
             _publicAccessService = publicAccessService;
             _eventAggregator = eventAggregator;
             _variationContextAccessor = variationContextAccessor;
             _settings = settingsService.GetSettings();
+            _sitemapCollectionProviders = sitemapCollectionProviders;
 
             _pageTypeSettings = new Dictionary<int, SitemapPageSettings>();
         }
@@ -77,6 +82,14 @@ public XDocument Generate(SitemapGeneratorOptions options)
 
                     _eventAggregator.Publish(new GenerateSitemapNotification(items));
 
+                    if (_sitemapCollectionProviders != null)
+                    {
+                        foreach (var collection in _sitemapCollectionProviders)
+                        {
+                            items.AddRange(collection.GetItems());
+                        }
+                    }
+
                     rootNamespace.Add(ToXmlElements(items));
 
                     if (_settings.ShowAlternatePages)

src/SeoToolkit.Umbraco.Sitemap.Core/Interfaces/ISitemapCollectionProvider.cs

@@ -0,0 +1,9 @@
+using SeoToolkit.Umbraco.Sitemap.Core.Models.Business;
+
+namespace SeoToolkit.Umbraco.Sitemap.Core.Interfaces
+{
+    public interface ISitemapCollectionProvider
+    {
+        SitemapNodeItem[] GetItems();
+    }
+}