CatherineLynwood/CatherineLynwood/Controllers/SitemapController.cs

using System.Text;
using System.Xml;

using CatherineLynwood.Models;
using CatherineLynwood.Services;

using Microsoft.AspNetCore.Mvc;

namespace CatherineLynwood.Controllers
{
    public class SitemapController : Controller
    {
        private DataAccess _dataAccess;

        public SitemapController(DataAccess dataAccess)
        {
            _dataAccess = dataAccess;
        }

        // Action to generate the sitemap dynamically
        [HttpGet("sitemap.xml")]
        public async Task<IActionResult> Sitemap()
        {
            var urls = await GetUrlsForSitemap(); 
            var sitemap = GenerateSitemapXml(urls);

            return Content(sitemap, "application/xml", Encoding.UTF8);
        }

        // Method to retrieve all URLs for the sitemap
        private async Task<List<SitemapEntry>> GetUrlsForSitemap()
        {
            var urls = new List<SitemapEntry>
            {
                new SitemapEntry { Url = Url.Action("Index", "Home", null, Request.Scheme).TrimEnd('/'), LastModified = DateTime.UtcNow },
                new SitemapEntry { Url = Url.Action("ContactCatherine", "Home", null, Request.Scheme).TrimEnd('/'), LastModified = DateTime.UtcNow },
                new SitemapEntry { Url = Url.Action("AboutCatherineLynwood", "Home", null, Request.Scheme).TrimEnd('/'), LastModified = DateTime.UtcNow },
                new SitemapEntry { Url = Url.Action("SamanthaLynwood", "Home", null, Request.Scheme).TrimEnd('/'), LastModified = DateTime.UtcNow },
                new SitemapEntry { Url = Url.Action("Index", "AskAQuestion", null, Request.Scheme).TrimEnd('/'), LastModified = DateTime.UtcNow },
                new SitemapEntry { Url = Url.Action("Index", "TheAlphaFlame", null, Request.Scheme).TrimEnd('/'), LastModified = DateTime.UtcNow },
                new SitemapEntry { Url = Url.Action("Blog", "TheAlphaFlame", null, Request.Scheme).TrimEnd('/'), LastModified = DateTime.UtcNow },
                new SitemapEntry { Url = Url.Action("Characters", "TheAlphaFlame", null, Request.Scheme).TrimEnd('/'), LastModified = DateTime.UtcNow },
                new SitemapEntry { Url = Url.Action("Discovery", "TheAlphaFlame", null, Request.Scheme).TrimEnd('/'), LastModified = DateTime.UtcNow },
                // Additional static pages
            };

            string[] characters = { "Maggie", "Beth", "Rosie", "Rob", "Zoe", "Rick", "Rebecca", "Sophie" };

            foreach(var character in characters)
            {
                urls.Add(new SitemapEntry
                {
                    Url = Url.Action(character, "TheAlphaFlame", null, Request.Scheme).TrimEnd('/'),
                    LastModified = DateTime.UtcNow
                });
            }

            // Add blog URLs dynamically, with PublishDate as LastModified
            BlogIndex blogIndex = await _dataAccess.GetBlogsAsync(null);
            foreach (var post in blogIndex.Blogs)
            {
                urls.Add(new SitemapEntry
                {
                    Url = Url.Action("BlogItem", "TheAlphaFlame", new { slug = post.BlogUrl }, Request.Scheme).TrimEnd('/'),
                    LastModified = post.PublishDate
                });
            }

            return urls;
        }

        // Generate XML sitemap from URL list
        private string GenerateSitemapXml(List<SitemapEntry> entries)
        {
            var xmlSettings = new XmlWriterSettings
            {
                Indent = true,
                Encoding = Encoding.UTF8,
                OmitXmlDeclaration = false  // Ensures the XML declaration is included
            };

            using var memoryStream = new MemoryStream();
            using (var xmlWriter = XmlWriter.Create(memoryStream, xmlSettings))
            {
                xmlWriter.WriteStartDocument();  // Writes <?xml version="1.0" encoding="UTF-8"?>

                // Write <urlset> with both sitemap and xhtml namespaces
                xmlWriter.WriteStartElement("urlset", "http://www.sitemaps.org/schemas/sitemap/0.9");
                xmlWriter.WriteAttributeString("xmlns", "xhtml", null, "http://www.w3.org/1999/xhtml");

                foreach (var entry in entries)
                {
                    xmlWriter.WriteStartElement("url");
                    xmlWriter.WriteElementString("loc", entry.Url);
                    xmlWriter.WriteElementString("lastmod", entry.LastModified.ToString("yyyy-MM-dd"));
                    xmlWriter.WriteElementString("changefreq", "weekly");
                    xmlWriter.WriteElementString("priority", "0.5");
                    xmlWriter.WriteEndElement();
                }

                xmlWriter.WriteEndElement();  // Closes <urlset>
                xmlWriter.WriteEndDocument(); // Closes document
                xmlWriter.Flush();  // Explicit flush to ensure all data is written
            }

            // Convert the memory stream to a UTF-8 encoded string
            return Encoding.UTF8.GetString(memoryStream.ToArray());
        }

    }
}