Progress Overhaul + Profile Page and a LOT more! (#4262)

Co-authored-by: Amelia <77553571+Fesaa@users.noreply.github.com>
Co-authored-by: Robbie Davis <robbie@therobbiedavis.com>

API/Helpers/AuthKeyHelper.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Security.Cryptography;
+
+namespace API.Helpers;
+
+public static class AuthKeyHelper
+{
+    private const string AllowedCharacters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
+    public const int MinKeyLength = 8;
+    public const int MaxKeyLength = 32;
+    public const string OpdsKeyName = "opds";
+    public const string ImageOnlyKeyName = "image-only";
+
+
+
+    public static string GenerateKey(int keyLength = 8)
+    {
+        if (keyLength is < MinKeyLength or > MaxKeyLength)
+        {
+            throw new ArgumentOutOfRangeException(nameof(keyLength),
+                $"Key length must be between {MinKeyLength} and {MaxKeyLength}");
+        }
+
+        return RandomNumberGenerator.GetString(AllowedCharacters, keyLength);
+    }
+}