✨ Affliation spell CRUD

DysonNetwork.Pass/Affiliation/AffiliationSpellService.cs

@@ -0,0 +1,45 @@
+using System.Security.Cryptography;
+using DysonNetwork.Shared.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace DysonNetwork.Pass.Affiliation;
+
+public class AffiliationSpellService(AppDatabase db)
+{
+    public async Task<SnAffiliationSpell> CreateAffiliationSpell(Guid accountId, string? spellWord)
+    {
+        spellWord ??= _GenerateRandomString(8);
+        var hasTaken = await db.AffiliationSpells.AnyAsync(s => s.Spell == spellWord);
+        if (hasTaken) throw new InvalidOperationException("The spell has been taken.");
+
+        var spell = new SnAffiliationSpell
+        {
+            AccountId = accountId,
+            Spell = spellWord
+        };
+        
+        db.AffiliationSpells.Add(spell);
+        await db.SaveChangesAsync();
+        return spell;
+    }
+
+    public async Task<SnAffiliationSpell?> GetAffiliationSpell(string spellWord)
+    {
+        var spell = await db.AffiliationSpells.FirstOrDefaultAsync(s => s.Spell == spellWord);
+        return spell;
+    }
+    
+    private static string _GenerateRandomString(int length)
+    {
+        const string chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+        var result = new char[length];
+        using var rng = RandomNumberGenerator.Create();
+        for (var i = 0; i < length; i++)
+        {
+            var bytes = new byte[1];
+            rng.GetBytes(bytes);
+            result[i] = chars[bytes[0] % chars.Length];
+        }
+        return new string(result);
+    }
+}