Extracted some pages to their own assembly and finished the artifact display page code

OpenArchival.Blazor/Controllers/FilesController.cs

@@ -0,0 +1,53 @@
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using OpenArchival.DataAccess; // Assuming your DbContext or service is here
+
+[Route("api/[controller]")]
+[ApiController]
+public class FilesController : ControllerBase
+{
+    // Inject your database context or a service to find file paths
+    private readonly IDbContextFactory<ApplicationDbContext> _context;
+
+    public FilesController(IDbContextFactory<ApplicationDbContext> dbFactory)
+    {
+        _context = dbFactory;
+    }
+
+    [HttpGet("{id}")]
+    public async Task<IActionResult> GetFile(int id)
+    {
+        await using var context = await _context.CreateDbContextAsync();
+
+        FilePathListing fileRecord = await context.ArtifactFilePaths.FindAsync(id);
+
+        if (fileRecord == null)
+        {
+            return NotFound();
+        }
+
+        var physicalPath = fileRecord.Path;
+
+        if (!System.IO.File.Exists(physicalPath))
+        {
+            return NotFound();
+        }
+
+        var fileStream = new FileStream(physicalPath, FileMode.Open, FileAccess.Read);
+
+        return new FileStreamResult(fileStream, GetMimeType(physicalPath));
+    }
+
+    private static string GetMimeType(string filePath)
+    {
+        var extension = Path.GetExtension(filePath).ToLowerInvariant();
+        return extension switch
+        {
+            ".jpg" => "image/jpeg",
+            ".jpeg" => "image/jpeg",
+            ".png" => "image/png",
+            ".gif" => "image/gif",
+            _ => "application/octet-stream", // Default for unknown file types
+        };
+    }
+}