style: fix spacing on links in index

OliverBooth/Pages/Blog/Article.cshtml

@@ -1,6 +1,8 @@
 @page "/blog/{year:int}/{month:int}/{day:int}/{slug}"
 @using Humanizer
 @using OliverBooth.Data.Blog
+@using OliverBooth.Services
+@inject IBlogPostService BlogPostService
 @model Article
 
 @if (Model.Post is not { } post)
@@ -24,6 +26,21 @@
     </ol>
 </nav>
 
+@switch (post.Visibility)
+{
+    case BlogPostVisibility.Private:
+        <div class="alert alert-danger" role="alert">
+            This post is private and can only be viewed by those with the password.
+        </div>
+        break;
+
+    case BlogPostVisibility.Unlisted:
+        <div class="alert alert-warning" role="alert">
+            This post is unlisted and can only be viewed by those with the link.
+        </div>
+        break;
+}
+
 <h1>@post.Title</h1>
 <p class="text-muted">
     <img class="blog-author-icon" src="@author.AvatarUrl" alt="@author.DisplayName">
@@ -54,6 +71,41 @@
 
 <hr>
 
+<div class="row">
+    <div class="col-sm-12 col-md-6">
+        @if (BlogPostService.GetPreviousPost(post) is { } previousPost)
+        {
+            <small>Previous Post</small>
+            <p class="lead">
+                <a asp-page="Article"
+                   asp-route-year="@previousPost.Published.Year.ToString("0000")"
+                   asp-route-month="@previousPost.Published.Month.ToString("00")"
+                   asp-route-day="@previousPost.Published.Day.ToString("00")"
+                   asp-route-slug="@previousPost.Slug">
+                    @previousPost.Title
+                </a>
+            </p>
+        }
+    </div>
+    <div class="col-sm-12 col-md-6" style="text-align: right;">
+        @if (BlogPostService.GetNextPost(post) is { } nextPost)
+        {
+            <small>Next Post</small>
+            <p class="lead">
+                <a asp-page="Article"
+                   asp-route-year="@nextPost.Published.Year.ToString("0000")"
+                   asp-route-month="@nextPost.Published.Month.ToString("00")"
+                   asp-route-day="@nextPost.Published.Day.ToString("00")"
+                   asp-route-slug="@nextPost.Slug">
+                    @nextPost.Title
+                </a>
+            </p>
+        }
+    </div>
+</div>
+
+<hr>
+
 @if (post.EnableComments)
 {
     <div id="disqus_thread"></div>
@@ -70,7 +122,7 @@
             s.async = true;
             s.type = "text/javascript";
             s.src = "https://oliverbooth-dev.disqus.com/embed.js";
-            s.setAttribute("data-timestamp", + new Date());
+            s.setAttribute("data-timestamp", (+ new Date()).toString());
             (d.head || d.body).appendChild(s);
         })();
     </script>

OliverBooth/Pages/Blog/Index.cshtml.cs

@@ -40,12 +40,11 @@ public class Index : PageModel
     {
         var route = new
         {
-            area = "blog",
             year = post.Published.ToString("yyyy"),
             month = post.Published.ToString("MM"),
             day = post.Published.ToString("dd"),
             slug = post.Slug
         };
-        return Redirect(Url.Page("/Article", route)!);
+        return Redirect(Url.Page("/Blog/Article", route)!);
     }
 }

OliverBooth/Pages/Index.cshtml

@@ -7,16 +7,14 @@
     My primary focus is C#, though I have dabbled in several other languages such as Java, Kotlin, VB, C/C++, Python,
     and others. Over the years I've built up a collection of projects. Some of which I'm extremely proud of, and others
     I've quietly abandoned and buried. I'm currently working on a few projects that I hope to release in the near
-    future, but in the meantime, feel free to check out some of my <a asp-page="/Projects/Index">previous work.</a>
+    future, but in the meantime, feel free to check out some of my <a asp-page="/Projects/Index">previous work</a>.
 </p>
 
 <p>
     I've also written a few <a asp-page="/Tutorials/Index">tutorials</a> on various topics, usually involving
     information not readily available elsewhere. I hope you find them useful. On occasion, I also write about other
     topics that I find interesting, such as
-    <a asp-page="/Blog/Index">
+    <a asp-page="/Blog/Index">my thoughts on the state of the world or the tech industry</a>.
-        my thoughts on the state of the world or the tech industry
-    </a>.
 </p>
 
 <p>

OliverBooth/Pages/PublicServiceAnnouncement/BinaryFormatter.cshtml

@@ -0,0 +1,47 @@
+@page "/psa/binaryformatter"
+
+<div class="alert alert-danger">
+    <h2 class="alert-heading">⚠️ Stop! This application is unsafe!</h2>
+    <p>
+        This application is using an insecure method to read and write data, and needs to be updated
+        <em>immediately</em>.
+    </p>
+</div>
+
+<div class="alert alert-warning">
+    <h4 class="alert-heading">I'm a user, what does this mean?</h4>
+    <p>
+        If you are seeing this message, it means you loaded a payload that I crafted to exploit this vulnerability. Be
+        fortunate, because I could have done much worse including stealing your data or installing malware on your
+        computer.
+    </p>
+    <p>
+        If you're seeing this because you loaded my data from a game, this means it's possible for an attacker to craft
+        a save file that can, for example, steal your Steam credentials and send them to a remote server. Just because
+        you loaded - what seemed to be - a save file!
+    </p>
+    <hr/>
+    <p>
+        <strong>Do not</strong> load any more data into this application until the developer has addressed this issue.
+    </p>
+</div>
+
+<div class="alert alert-info">
+    <h4 class="alert-heading">I'm a developer, can you explain more?</h4>
+    <p>
+        <code>BinaryFormatter</code> is a .NET class that is used to serialize and deserialize data such as game saves
+        or configuration files. However, it was discovered that this class is vulnerable to remote code execution when
+        deserializing untrusted data.
+    </p>
+    <p>
+        <strong>Please update your application to use a different serialization method.</strong>
+    </p>
+    <hr/>
+    <p>
+        For more information, please read the
+        <a href="https://learn.microsoft.com/en-us/dotnet/standard/serialization/binaryformatter-security-guide">
+            official security notice
+        </a>
+        from Microsoft.
+    </p>
+</div>

OliverBooth/Pages/Tutorials/Index.cshtml

@@ -0,0 +1,17 @@
+@page "/tutorials"
+@{
+    ViewData["Title"] = "Tutorials";
+}
+
+<h1 class="display-4">Tutorials</h1>
+<p class="lead">Coming Soon</p>
+<p>
+    Due to Unity's poor corporate decision-making, I'm left in a position where I find it infeasible to write Unity
+    tutorials. I plan to write tutorials for things like Unreal and MonoGame as I learn them, and C# tutorials are
+    still on the table for sure. But tutorials take a lot of time and effort, so unfortunately it may be a while before
+    I can get around to publishing them.
+</p>
+<p>
+    I'm sorry for the inconvenience, but I hope you understand my position. Watch this space! New tutorials will be
+    coming. If you have any questions or requests, please feel free to <a asp-page="/Contact/Other">contact me</a>.
+</p>

OliverBooth/Services/BlogPostService.cs

@@ -66,6 +66,26 @@ internal sealed class BlogPostService : IBlogPostService
             .ToArray().Select(CacheAuthor).ToArray();
     }
 
+    /// <inheritdoc />
+    public IBlogPost? GetNextPost(IBlogPost blogPost)
+    {
+        using BlogContext context = _dbContextFactory.CreateDbContext();
+        return context.BlogPosts
+            .Where(p => p.Visibility == BlogPostVisibility.Published)
+            .OrderBy(post => post.Published)
+            .FirstOrDefault(post => post.Published > blogPost.Published);
+    }
+
+    /// <inheritdoc />
+    public IBlogPost? GetPreviousPost(IBlogPost blogPost)
+    {
+        using BlogContext context = _dbContextFactory.CreateDbContext();
+        return context.BlogPosts
+            .Where(p => p.Visibility == BlogPostVisibility.Published)
+            .OrderByDescending(post => post.Published)
+            .FirstOrDefault(post => post.Published < blogPost.Published);
+    }
+
     /// <inheritdoc />
     public string RenderExcerpt(IBlogPost post, out bool wasTrimmed)
     {

OliverBooth/Services/IBlogPostService.cs

@@ -34,6 +34,20 @@ public interface IBlogPostService
     /// <returns>A collection of blog posts.</returns>
     IReadOnlyList<IBlogPost> GetBlogPosts(int page, int pageSize = 10);
 
+    /// <summary>
+    ///     Returns the next blog post from the specified blog post.
+    /// </summary>
+    /// <param name="blogPost">The blog post whose next post to return.</param>
+    /// <returns>The next blog post from the specified blog post.</returns>
+    IBlogPost? GetNextPost(IBlogPost blogPost);
+
+    /// <summary>
+    ///     Returns the previous blog post from the specified blog post.
+    /// </summary>
+    /// <param name="blogPost">The blog post whose previous post to return.</param>
+    /// <returns>The previous blog post from the specified blog post.</returns>
+    IBlogPost? GetPreviousPost(IBlogPost blogPost);
+
     /// <summary>
     ///     Renders the excerpt of the specified blog post.
     /// </summary>