From 1d21cb3733f6953d0f14cb643827e71064d6d586 Mon Sep 17 00:00:00 2001
From: Sipke Schoorstra <sipkeschoorstra@outlook.com>
Date: Fri, 29 Dec 2023 09:30:51 +0100
Subject: [PATCH] Add extension method to get workflow instance ID

This adds a new extension method in HttpResponseMessageExtensions class which retrieves the workflow instance ID from the response. It also includes a HeaderNames class to maintain the consistency of header names used by the Elsa API.
---
 .../Elsa.Api.Client/Extensions/HeaderExtensions.cs | 14 ++++++++++++++
 src/clients/Elsa.Api.Client/Shared/HeaderNames.cs  | 12 ++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 src/clients/Elsa.Api.Client/Extensions/HeaderExtensions.cs
 create mode 100644 src/clients/Elsa.Api.Client/Shared/HeaderNames.cs

diff --git a/src/clients/Elsa.Api.Client/Extensions/HeaderExtensions.cs b/src/clients/Elsa.Api.Client/Extensions/HeaderExtensions.cs
new file mode 100644
index 0000000000..e23bafce7b
--- /dev/null
+++ b/src/clients/Elsa.Api.Client/Extensions/HeaderExtensions.cs
@@ -0,0 +1,14 @@
+using Elsa.Api.Client.Shared;
+
+namespace Elsa.Api.Client.Extensions;
+
+/// <summary>
+/// Contains extension methods for the <see cref="HttpResponseMessage"/> class.
+/// </summary>
+public static class HttpResponseMessageExtensions
+{
+    /// <summary>
+    /// Gets the workflow instance ID from the response.
+    /// </summary>
+    public static string? GetWorkflowInstanceId(this HttpResponseMessage response) => response.Headers.TryGetValues(HeaderNames.WorkflowInstanceId, out var values) ? values.FirstOrDefault() : default;
+}
\ No newline at end of file
diff --git a/src/clients/Elsa.Api.Client/Shared/HeaderNames.cs b/src/clients/Elsa.Api.Client/Shared/HeaderNames.cs
new file mode 100644
index 0000000000..a3c26753c4
--- /dev/null
+++ b/src/clients/Elsa.Api.Client/Shared/HeaderNames.cs
@@ -0,0 +1,12 @@
+namespace Elsa.Api.Client.Shared;
+
+/// <summary>
+/// Contains header names used by the Elsa API.
+/// </summary>
+public static class HeaderNames
+{
+    /// <summary>
+    /// The name of the header that contains the workflow instance ID.
+    /// </summary>
+    public const string WorkflowInstanceId = "x-elsa-workflow-instance-id";
+}
\ No newline at end of file