refactor(Extensions): move to common

EnvelopeGenerator.Application/Common/Extensions/MappingExtensions.cs

@@ -0,0 +1,27 @@
+using EnvelopeGenerator.Application.Common.Dto.Messaging;
+
+namespace EnvelopeGenerator.Application.Common.Extensions;
+
+/// <summary>
+/// Provides extension methods for common mapping and conversion operations.
+/// </summary>
+public static class MappingExtensions
+{
+    /// <summary>
+    /// Determines whether the response indicates a successful "OK" message status.
+    /// </summary>
+    /// <param name="gtxMessagingResponse">The response object to evaluate.</param>
+    /// <returns><see langword="true"/> if the response contains a "message-status" key with a value of "ok"  (case-insensitive);
+    /// otherwise, <see langword="false"/>.</returns>
+    public static bool Ok(this GtxMessagingResponse gtxMessagingResponse)
+        => gtxMessagingResponse.TryGetValue("message-status", out var status)
+        && status?.ToString()?.ToLower() == "ok";
+
+    /// <summary>
+    /// Converts the specified byte array to its equivalent string representation encoded in base-64.
+    /// </summary>
+    /// <param name="bytes">The byte array to encode.</param>
+    /// <returns>A base-64 encoded string representation of the input byte array.</returns>
+    public static string ToBase64String(this byte[] bytes)
+        => Convert.ToBase64String(bytes);
+}