refactor: Refactor Get connections

Validators/GetPuzzleRequestValidator.cs

@@ -0,0 +1,23 @@
+using System.Globalization;
+using System.Text.RegularExpressions;
+using ConnectionsAPI.Models.Request;
+using FluentValidation;
+
+namespace ConnectionsAPI.Validators;
+
+public partial class GetPuzzleRequestValidator : Validator<GetPuzzleRequest>
+{
+  [GeneratedRegex("^\\d{4}-\\d{2}-\\d{2}$", RegexOptions.IgnoreCase)]
+  private static partial Regex PrintDateGeneratedRegex();
+
+  public GetPuzzleRequestValidator()
+  {
+    RuleFor(x => x.PrintDate)
+      .NotEmpty().WithMessage("Puzzle date is required")
+      .Must(x => PrintDateGeneratedRegex().IsMatch(x))
+        .WithMessage("Print date must be in the format yyyy-MM-dd")
+      .Must(x => DateTime.TryParseExact(x, "yyyy-MM-dd", CultureInfo.InvariantCulture, DateTimeStyles.AssumeUniversal, out _))
+        .WithMessage("Print date must be a valid datetime");
+
+  }
+}