ensure the avatar path

src/Yavsc.Org/Extensions/HostingExtensions.cs

@@ -18,6 +18,7 @@ using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
 using Microsoft.AspNetCore.Localization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.Razor;
+using Microsoft.AspNetCore.Http;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Diagnostics;
 using Microsoft.EntityFrameworkCore.Infrastructure;
@@ -1282,10 +1283,52 @@ ADD COLUMN IF NOT EXISTS ""Moderated"" boolean NOT NULL DEFAULT FALSE;");
 
         app.UseFileServer(Config.AvatarsOptions);
 
+        app.Use(async (context, next) =>
+        {
+            await next();
+
+            if (context.Response.StatusCode != StatusCodes.Status404NotFound
+                || context.Response.HasStarted
+                || !HttpMethods.IsGet(context.Request.Method)
+                || !context.Request.Path.StartsWithSegments(Constants.AvatarsPath, out var avatarFile))
+            {
+                return;
+            }
+
+            var webHostEnvironment = app.ApplicationServices.GetRequiredService<IWebHostEnvironment>();
+            var fallbackAsset = ResolveAvatarFallbackAsset(avatarFile);
+            var fallbackFile = webHostEnvironment.WebRootFileProvider.GetFileInfo(fallbackAsset.TrimStart('/'));
+            if (!fallbackFile.Exists)
+            {
+                return;
+            }
+
+            context.Response.StatusCode = StatusCodes.Status200OK;
+            context.Response.ContentType = "image/png";
+            await context.Response.SendFileAsync(fallbackFile);
+        });
+
         app.UseFileServer(Config.GitOptions);
         app.UseStaticFiles();
         return app;
     }
 
+    private static string ResolveAvatarFallbackAsset(PathString avatarFile)
+    {
+        var fileName = avatarFile.Value ?? string.Empty;
+
+        if (fileName.EndsWith(".xs.png", StringComparison.OrdinalIgnoreCase))
+        {
+            return "/images/Users/icon_user.xs.png";
+        }
+
+        if (fileName.EndsWith(".s.png", StringComparison.OrdinalIgnoreCase))
+        {
+            return "/images/Users/icon_user.s.png";
+        }
+
+        return Constants.DefaultAvatar;
+    }
+
 
 }

src/Yavsc.Org/Views/Manage/Index.cshtml

@@ -2,6 +2,9 @@
 @using System.Security.Claims
 @{
     ViewBag.Title = "Manage your account";
+    var avatarSrc = string.IsNullOrWhiteSpace(Model.UserName)
+        ? Yavsc.Constants.DefaultAvatar
+        : $"{Yavsc.Constants.AvatarsPath}/{Model.UserName}.s.png";
 }
 
 <h2>@ViewBag.Title</h2>
@@ -86,7 +89,7 @@ Html.DisplayText("Modify");
 
         <dt>Avatar:</dt>
         <dd>
-                   <img src="/Avatars/@(User.GetUserName()+".s").png" asp-append-version="true" class="smalltofhol" />
+                   <img src="@avatarSrc" asp-append-version="true" class="smalltofhol" />
             [<a asp-controller="Manage" asp-action="SetAvatar">Modify</a>]
         </dd>
 

src/Yavsc.Org/Views/Manage/SetAvatar.cshtml

@@ -1,5 +1,10 @@
 @model PerformerProfile
 @{ ViewBag.Title = "Edit your avatar"; }
+@{
+    var previewAvatarSrc = string.IsNullOrWhiteSpace(User?.Identity?.Name)
+        ? Yavsc.Constants.DefaultAvatar
+        : $"{Yavsc.Constants.AvatarsPath}/{User.Identity.Name}.png";
+}
 @section header{
 <script src="https://unpkg.com/dropzone@5/dist/min/dropzone.min.js"></script>
 <link rel="stylesheet" href="https://unpkg.com/dropzone@5/dist/min/dropzone.min.css" type="text/css" />
@@ -21,7 +26,7 @@ $(document).ready(function() {
   });
 </script>
 }
-<img src="~/avatars/@(User.Identity.Name).png">
+<img src="@previewAvatarSrc">
 
 <form id="postavatar" action="/api/setavatar" class="dropzone" method="post" enctype="multipart/form-data">
     <div class="fallback">

src/Yavsc.Org/Views/Shared/DisplayTemplates/ApplicationUserLink.cshtml

@@ -1,5 +1,13 @@
+@using Yavsc.Abstract.Identity
 @model ApplicationUser
 
-@if (Model!=null) {
-                   <img src="/Avatars/@(Model.UserName+".xs").png" asp-append-version="true" class="smalltofhol" />
+@if (Model != null)
+{
+    var avatarSrc = UserDisplayHelpers.AvatarSrc(Model);
+    if (avatarSrc.EndsWith(".s.png", StringComparison.Ordinal))
+    {
+        avatarSrc = avatarSrc.Replace(".s.png", ".xs.png", StringComparison.Ordinal);
+    }
+
+    <img src="@avatarSrc" asp-append-version="true" class="smalltofhol" />
 }

src/Yavsc.Org/Views/Shared/DisplayTemplates/IApplicationUser.cshtml

@@ -10,7 +10,7 @@ if (Model ==null || Model.UserName==null)
   }
 }
 else {
-     string avuri = "/Avatars/" + Model.UserName + ".s.png";
+     string avuri = UserDisplayHelpers.AvatarSrc(Model);
 
 <div class="userinfo">
     <a title="Posts" asp-controller="Blogspot" asp-action="Index" asp-route-id="@Model.UserName" class="btn btn-primary">