The assumption is that upon first deployment the site will start up without a root URL defined.

dasblog will allow you to login and change the root url through the web page and update the root URL.

Some functions will still not work so this should still be the first thing you do.

Author: poppastring

source/DasBlog.Services/Site/SiteHttpContext.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace DasBlog.Services.Site
+{
+	public class SiteHttpContext
+	{
+		private static IHttpContextAccessor m_httpContextAccessor;
+
+		public static HttpContext Current => m_httpContextAccessor.HttpContext;
+
+		public static string AppBaseUrl => $"{Current.Request.Scheme}://{Current.Request.Host}{Current.Request.PathBase}";
+
+		internal static void Configure(IHttpContextAccessor contextAccessor)
+		{
+			m_httpContextAccessor = contextAccessor;
+		}
+	}
+
+	public static class HttpContextExtensions
+	{
+		public static IApplicationBuilder UseHttpContext(this IApplicationBuilder app)
+		{
+			SiteHttpContext.Configure(app.ApplicationServices.GetRequiredService<IHttpContextAccessor>());
+			return app;
+		}
+	}
+}

source/DasBlog.Web.Repositories/FileSystemBinaryManager.cs

@@ -3,6 +3,7 @@
 using DasBlog.Services.ConfigFile;
 using DasBlog.Services.FileManagement;
 using DasBlog.Services.FileManagement.Interfaces;
+using DasBlog.Services.Site;
 using Microsoft.Extensions.Options;
 using newtelligence.DasBlog.Runtime;
 using System;
@@ -18,7 +19,6 @@ public class FileSystemBinaryManager : IFileSystemBinaryManager
 		private readonly IConfigFileService<OEmbedProviders> oembedProvidersService;
 		private readonly IConfigFileService<SiteConfig> siteConfigFileService;
 		private readonly ConfigFilePathsDataOption options;
-		private readonly string contentBinaryUrl;
 
 		public FileSystemBinaryManager(IDasBlogSettings dasBlogSettings, IConfigFileService<MetaTags> metaTagFileService,
 										 IConfigFileService<OEmbedProviders> oembedProvidersService,
@@ -27,17 +27,24 @@ public FileSystemBinaryManager(IDasBlogSettings dasBlogSettings, IConfigFileServ
 			this.dasBlogSettings = dasBlogSettings;
 			this.metaTagFileService = metaTagFileService;
 			this.oembedProvidersService = oembedProvidersService;
-			this.siteConfigFileService = siteConfigFileService;
+			this.siteConfigFileService = siteConfigFileService;;
 			options = optionsAccessor.Value;
-			contentBinaryUrl = dasBlogSettings.RelativeToRoot(options.BinaryUrlRelative);
 
-			var physBinaryPathUrl = new Uri(contentBinaryUrl);
+			Uri physBinaryPathUrl;
 
-			var loggingDataService = LoggingDataServiceFactory.GetService(Path.Combine(dasBlogSettings.WebRootDirectory, dasBlogSettings.SiteConfiguration.LogDir));
+			if (!string.IsNullOrWhiteSpace(dasBlogSettings.SiteConfiguration.Root))
+			{
+				physBinaryPathUrl = new Uri(dasBlogSettings.RelativeToRoot(options.BinaryUrlRelative));
+			}
+			else
+			{
+				physBinaryPathUrl = new Uri(new Uri(SiteHttpContext.AppBaseUrl), options.BinaryUrlRelative);
+			}
 
+			var loggingDataService = LoggingDataServiceFactory.GetService(Path.Combine(dasBlogSettings.WebRootDirectory, dasBlogSettings.SiteConfiguration.LogDir));
 			var cdnManager = CdnManagerFactory.GetService(dasBlogSettings.SiteConfiguration.CdnFrom, dasBlogSettings.SiteConfiguration.CdnTo);
 
-			binaryDataService = BinaryDataServiceFactory.GetService(options.BinaryFolder, physBinaryPathUrl, loggingDataService, cdnManager);
+			this.binaryDataService = BinaryDataServiceFactory.GetService(options.BinaryFolder, physBinaryPathUrl, loggingDataService, cdnManager);
 		}
 
 		public string SaveFile(Stream inputFile, string fileName)

source/DasBlog.Web.UI/Config/site.config

@@ -3,7 +3,7 @@
 
   <!-- REQUIRED: Your blog will not work properly until you configure these settings. -->
   <!-- Set the Root to the base URL of this blog, such as http://example.com/blog/ -->
-  <Root>https://localhost:5001/</Root>
+  <Root></Root>
 
   <!-- NotificationEMailAddress is the address used by the system to send you event (blog posts, comment posts) notifications.
        This address will NOT be published on the website. -->

source/DasBlog.Web.UI/Settings/DasBlogSettings.cs

@@ -78,12 +78,26 @@ public DasBlogSettings(IWebHostEnvironment env, IOptionsMonitor<SiteConfig> site
 
 		public string GetBaseUrl()
 		{
-			return new Uri(SiteConfiguration.Root).AbsoluteUri;
+			if (!string.IsNullOrWhiteSpace(SiteConfiguration.Root))
+			{
+				return new Uri(SiteConfiguration.Root).AbsoluteUri;
+			}
+			else
+			{
+				return "/";
+			}
 		}
 
 		public string RelativeToRoot(string relative)
 		{
-			return new Uri(new Uri(SiteConfiguration.Root), relative).AbsoluteUri;
+			if (!string.IsNullOrWhiteSpace(SiteConfiguration.Root))
+			{
+				return new Uri(new Uri(GetBaseUrl()), relative).AbsoluteUri;
+			}
+			else
+			{
+				return relative;
+			}
 		}
 
         public string GetPermaLinkUrl(string entryId)

source/DasBlog.Web.UI/Startup.cs

@@ -208,6 +208,7 @@ public void ConfigureServices(IServiceCollection services)
 				.AddSingleton<ISiteManager, SiteManager>()
 				.AddSingleton<IActivityPubManager, ActivityPubManager>()
 				.AddSingleton<IHttpContextAccessor, HttpContextAccessor>()
+				.AddSingleton<SiteHttpContext>()
 				.AddSingleton<IFileSystemBinaryManager, FileSystemBinaryManager>()
 				.AddSingleton<IUserDataRepo, UserDataRepo>()
 				.AddSingleton<ISiteSecurityConfig, SiteSecurityConfig>()
@@ -297,8 +298,12 @@ public void Configure(IApplicationBuilder app, IWebHostEnvironment env, IDasBlog
 			app.UseRouting();
 
 			//if you've configured it at /blog or /whatever, set that pathbase so ~ will generate correctly
-			var rootUri = new Uri(dasBlogSettings.SiteConfiguration.Root);
-			var path = rootUri.AbsolutePath;
+			var path = "/";
+			if (!string.IsNullOrWhiteSpace(dasBlogSettings.SiteConfiguration.Root))
+			{
+				var rootUri = new Uri(dasBlogSettings.SiteConfiguration.Root);
+				path = rootUri.AbsolutePath;
+			}
 
 			//Deal with path base and proxies that change the request path
 			if (path != "/")
@@ -432,6 +437,8 @@ public void Configure(IApplicationBuilder app, IWebHostEnvironment env, IDasBlog
 				endpoints.MapControllerRoute(
 					name: "default", "~/{controller=Home}/{action=Index}/{id?}");
 			});
+
+			app.UseHttpContext();
 		}
 
 		/// <summary>

source/DasBlog.Web.UI/TagHelpers/Post/PostToFacebookTagHelper.cs

@@ -24,7 +24,7 @@ public override async Task ProcessAsync(TagHelperContext context, TagHelperOutpu
 			output.TagMode = TagMode.StartTagAndEndTag;
 			output.Attributes.SetAttribute("class", "dasblog-a-share-facebook");
 			output.Attributes.SetAttribute("href", string.Format(FACEBOOK_SHARE_URL, 
-				UrlEncoder.Default.Encode(new Uri(new Uri(dasBlogSettings.GetBaseUrl()), Post.PermaLink).AbsoluteUri)));
+				UrlEncoder.Default.Encode(dasBlogSettings.RelativeToRoot(Post.PermaLink))));
 
 			var content = await output.GetChildContentAsync();
 

source/DasBlog.Web.UI/TagHelpers/Post/PostToLinkedInTagHelper.cs

@@ -24,7 +24,7 @@ public override async Task ProcessAsync(TagHelperContext context, TagHelperOutpu
 		output.TagMode = TagMode.StartTagAndEndTag;
 		output.Attributes.SetAttribute("class", "dasblog-a-share-linkedin");
 		output.Attributes.SetAttribute("href", string.Format(LINKEDIN_SHARE_URL, 
-			UrlEncoder.Default.Encode(new Uri(new Uri(dasBlogSettings.GetBaseUrl()), Post.PermaLink).AbsoluteUri)));
+			UrlEncoder.Default.Encode(dasBlogSettings.RelativeToRoot(Post.PermaLink))));
 
 		var content = await output.GetChildContentAsync();
 

source/DasBlog.Web.UI/TagHelpers/Post/PostToRedditTagHelper.cs

@@ -24,7 +24,7 @@ public override async Task ProcessAsync(TagHelperContext context, TagHelperOutpu
 			output.TagMode = TagMode.StartTagAndEndTag;
 			output.Attributes.SetAttribute("class", "dasblog-a-share-reddit");
 			output.Attributes.SetAttribute("href", string.Format(REDDIT_SHARE_URL,
-								UrlEncoder.Default.Encode(new Uri(new Uri(dasBlogSettings.GetBaseUrl()), Post.PermaLink).AbsoluteUri),
+								UrlEncoder.Default.Encode(dasBlogSettings.RelativeToRoot(Post.PermaLink)),
 								UrlEncoder.Default.Encode(Post.Title)
 								));
 

source/DasBlog.Web.UI/TagHelpers/Post/PostToTwitterTagHelper.cs

@@ -29,7 +29,7 @@ public override async Task ProcessAsync(TagHelperContext context, TagHelperOutpu
 			output.Attributes.SetAttribute("class", "dasblog-a-share-twitter");
 
 			output.Attributes.SetAttribute("href", string.Format(TWITTER_SHARE_URL, 
-								UrlEncoder.Default.Encode(new Uri(new Uri(dasBlogSettings.GetBaseUrl()), Post.PermaLink).AbsoluteUri),
+								UrlEncoder.Default.Encode(dasBlogSettings.RelativeToRoot(Post.PermaLink)),
 								UrlEncoder.Default.Encode(Post.Title),
 								UrlEncoder.Default.Encode(author.TrimStart('@')), 
 								RetrieveFormattedCategories(Post.Categories)));