Add Area Support

Needs testing

WebServer/AreaBase.cs

@@ -0,0 +1,90 @@
+using Microsoft.Extensions.Hosting;
+using RazorLight;
+using System;
+using System.Collections.Generic;
+using System.Dynamic;
+using System.Net;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+using WebServer.Models;
+
+namespace WebServer {
+    public abstract class AreaBase { // Formally `HttpEndpointHandler`
+        // Provides razor pages, resources and relevent db tables and entities
+        public readonly HttpServer Server;
+        public readonly RazorLightEngine RazorEngine;
+        public readonly string Hostname;
+        public readonly string AreaPath;
+        public readonly AreaBase? ParentArea;
+
+        public AreaBase(HttpServer server, string host) : this(server, host, string.Empty) { }
+
+        public AreaBase(HttpServer server, string host, string areaPath) {
+            if (server == null) throw new ArgumentNullException(nameof(server));
+            if (string.IsNullOrEmpty(host)) throw new ArgumentNullException(nameof(host));
+            Server = server;
+            RazorEngine = server.GetOrCreateRazorEngine(host);
+            Hostname = host;
+            AreaPath = areaPath ?? string.Empty;
+        }
+
+        public AreaBase(AreaBase parentArea, string relativeAreaPath) { // So you can build on top of other areas
+            ParentArea = parentArea;
+            Server = parentArea.Server;
+            RazorEngine = parentArea.RazorEngine;
+            Hostname = parentArea.Hostname;
+            AreaPath = $"{parentArea.AreaPath}/{relativeAreaPath.Trim(' ', '/', '\\')}";
+        }
+
+        public static Uri BuildUri(HttpListenerRequest request, string path) {
+            string uriString = $"{(request.IsSecureConnection ? "https" : "http")}://{request.UserHostName}/";
+            if (string.IsNullOrEmpty(path))
+                return new Uri(uriString);
+            path = path.Replace('\\', '/');
+            if (path[0] == '/')
+                path = path.Substring(1);
+            uriString += path;
+            return new Uri(uriString);
+        }
+
+        #region Razor Stuff
+        public async Task<HttpResponse> GetGenericStatusPageAsync(StatusPageModel model, ExpandoObject? viewBag = null) {
+            return await Server.GetGenericStatusPageAsync(model, Hostname, viewBag);
+        }
+        public async Task<HttpResponse> GetGenericStatusPageAsync(HttpStatusCode statusCode, ExpandoObject? viewBag = null)
+             => await GetGenericStatusPageAsync(new StatusPageModel(statusCode), viewBag);
+
+        /// <summary>Renders a View with a T model</summary>
+        /// <typeparam name="T">Type of the model</typeparam>
+        /// <param name="viewPath">The view path relative to the AreaName, keep in mind that prepending a '/' (or '\') will go to root of the top-most area</param>
+        /// <param name="model">The model supplied to the view</param>
+        /// <returns>A string of the compiled view</returns>
+        public async Task<string> RenderAsync<T>(string viewPath, T model, ExpandoObject viewBag = null) { // Formally Try/GetTemplate
+            viewPath = viewPath.Trim().Replace('\\', '/');
+            string root = viewPath[0] == '/' ? "" : AreaPath;
+            return await RazorEngine.CompileRenderAsync<T>($"{root}{viewPath}", model, viewBag);
+        }
+        #endregion
+
+        #region Event Binds
+        public Regex GetRegex(string regex) => new Regex(regex, RegexOptions.IgnoreCase | RegexOptions.Singleline | RegexOptions.CultureInvariant);
+
+        public bool TryAddEventCallback(Regex regex, HttpServer.Callback callback)
+            => Server.TryAddEventCallback(Hostname, regex, callback);
+
+        public void AddEventCallback(Regex regex, HttpServer.Callback callback) {
+            if (!TryAddEventCallback(regex, callback))
+                throw new Exception($"Error in Area '{AreaPath}'! Failed to bind event callback to `{callback.Method.Name}`");
+        }
+
+        public bool TryAddEventCallback(string regexPattern, HttpServer.Callback callback)
+            => TryAddEventCallback(GetRegex(regexPattern), callback);
+
+        public void AddEventCallback(string regexPattern, HttpServer.Callback callback) {
+            if (!TryAddEventCallback(regexPattern, callback))
+                throw new Exception($"Error in Area '{AreaPath}'! Failed to bind event callback to `{callback.Method.Name}`");
+        }
+        #endregion
+    }
+}

WebServer/HttpServer.cs

@@ -24,6 +24,7 @@ namespace WebServer {
         public delegate Task<HttpResponse?> Callback(HttpListenerContext context, CachedResponse? cache);
 
         Dictionary<string, Dictionary<Regex, Callback>> HttpCallbacks = new Dictionary<string, Dictionary<Regex, Callback>>();
+        public List<AreaBase> RegisteredAreas = new List<AreaBase>();
         Dictionary<string, RazorLightEngine> RazorEngines = new Dictionary<string, RazorLightEngine>();
         public readonly RazorLightEngine DefaultRazorEngine;
         /* Instead of three directories (from previous render engine)
@@ -357,5 +358,17 @@ namespace WebServer {
             }
             return removeCount > 0;
         }
+
+        public bool TryRegisterArea<T>(Func<T>? areaInitilizer, out T area) where T : AreaBase {
+            area = areaInitilizer?.Invoke() ?? default;
+            if (area == null) return false;
+            RegisteredAreas.Add(area);
+            return true;
+        }
+
+        public void RegisterArea<T>(Func<T>? areaInitializer, out T area) where T : AreaBase {
+            if (!TryRegisterArea(areaInitializer, out area))
+                throw new Exception($"Failed to bind {typeof(T).FullName}! Is your initializer returning a valid area?");
+        }
     }
 }