Add GetCallStatus activity

src/modules/Elsa.Telnyx/Activities/GetCallStatus.cs

@@ -0,0 +1,45 @@
+using System.Runtime.CompilerServices;
+using System.Text.Json.Serialization;
+using Elsa.Extensions;
+using Elsa.Telnyx.Client.Services;
+using Elsa.Workflows.Core.Activities.Flowchart.Attributes;
+using Elsa.Workflows.Core.Attributes;
+using Elsa.Workflows.Core.Models;
+
+namespace Elsa.Telnyx.Activities;
+
+/// <inheritdoc />
+[FlowNode("Alive", "Dead", "Done")]
+[Activity(Constants.Namespace, "Get the status of a call.", Kind = ActivityKind.Task)]
+public class GetCallStatus : CodeActivity<bool>
+{
+    /// <inheritdoc />
+    [JsonConstructor]
+    public GetCallStatus([CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line)
+    {
+    }
+    
+    /// <summary>
+    /// Unique identifier and token for controlling the call.
+    /// </summary>
+    [Input(
+        DisplayName = "Call Control ID",
+        Description = "Unique identifier and token for controlling the call.",
+        Category = "Advanced"
+    )]
+    public Input<string> CallControlId { get; set; } = default!;
+
+    /// <inheritdoc />
+    protected override async ValueTask ExecuteAsync(ActivityExecutionContext context)
+    {
+        var client = context.GetRequiredService<ITelnyxClient>();
+        var callControlId = CallControlId.Get(context);
+        var response = await client.Calls.GetStatusAsync(callControlId, context.CancellationToken);
+        var isAlive = response.Data.IsAlive;
+        var outcome = isAlive ? "Alive" : "Dead";
+        
+        Result.Set(context, isAlive);
+
+        await context.CompleteActivityWithOutcomesAsync(outcome, "Done");
+    }
+}