Initial BinaryLane v2 API client

src/BinaryLane.Api/Configuration/BinaryLaneOptionsValidator.cs

@@ -0,0 +1,24 @@
+using Microsoft.Extensions.Options;
+
+namespace BinaryLane.Api.V2.Configuration;
+
+/// <summary>Validates client options at application startup.</summary>
+public sealed class BinaryLaneOptionsValidator : IValidateOptions<BinaryLaneOptions>
+{
+    /// <inheritdoc />
+    public ValidateOptionsResult Validate(string? name, BinaryLaneOptions options)
+    {
+        if (options is null)
+        {
+            return ValidateOptionsResult.Fail("BinaryLane options are required.");
+        }
+
+        if (!BinaryLaneOptions.IsValid(options))
+        {
+            return ValidateOptionsResult.Fail(
+                "BinaryLane BaseUrl must be an absolute HTTPS URL and RequestTimeoutSeconds must be between 1 and 300.");
+        }
+
+        return ValidateOptionsResult.Success;
+    }
+}