feat: give the user the ability to make a password policy

Security/Services/PasswordPolicyService.cs

@@ -0,0 +1,40 @@
+using Mirea.Api.Security.Common.Domain;
+using System.Linq;
+using System.Security;
+
+namespace Mirea.Api.Security.Services;
+
+public class PasswordPolicyService(PasswordPolicy policy)
+{
+    public void ValidatePasswordOrThrow(string password)
+    {
+        if (password.Length < policy.MinimumLength)
+            throw new SecurityException($"Password must be at least {policy.MinimumLength} characters long.");
+
+        if (policy.RequireLetter && !password.Any(char.IsLetter))
+            throw new SecurityException("Password must contain at least one letter.");
+
+        if (policy.RequireLettersDifferentCase && !password.Any(char.IsLower) && !password.Any(char.IsUpper))
+            throw new SecurityException("Password must contain at least one lowercase and uppercase letter.");
+
+        if (policy.RequireDigit && !password.Any(char.IsDigit))
+            throw new SecurityException("Password must contain at least one digit.");
+
+        if (policy.RequireSpecialCharacter && password.All(char.IsLetterOrDigit))
+            throw new SecurityException("Password must contain at least one special character.");
+    }
+
+    public bool TryValidatePassword(string password)
+    {
+        try
+        {
+            ValidatePasswordOrThrow(password);
+        }
+        catch
+        {
+            return false;
+        }
+
+        return true;
+    }
+}