Deserialize DF orchestrator input

src/DurableEngine/Models/OrchestrationContext.cs

@@ -23,7 +23,10 @@ public class OrchestrationContext
         /// Input to the orchestrator.
         /// </summary>
         [DataMember]
-        public object Input { get; set; }
+        public object Input
+        { 
+            get => DTFxContext?.GetInput<object>();
+        }
 
         /// <summary>
         /// Orchestrator instanceID.

test/E2E/AzureFunctions.PowerShell.Durable.SDK.E2E/DurableClientTests.cs

@@ -88,6 +88,42 @@ await ValidateDurableWorkflowResults(
                 });
         }
 
+        [Fact]
+        public async Task DurableSubOrchestratoWithArrayInputCompletes()
+        {
+            var initialResponse = await Utilities.GetHttpStartResponse("SubOrchestratorWithArrayInput");
+            Assert.Equal(HttpStatusCode.Accepted, initialResponse.StatusCode);
+
+            var location = initialResponse.Headers.Location;
+            Assert.NotNull(location);
+
+            await ValidateDurableWorkflowResults(
+                initialResponse,
+                validateInitialResponse: (dynamic initialStatusResponseBody) =>
+                {
+                    Assert.NotNull(initialStatusResponseBody.id);
+                    var statusQueryGetUri = (string)initialStatusResponseBody.statusQueryGetUri;
+                    Assert.Equal(location?.ToString(), statusQueryGetUri);
+                    Assert.NotNull(initialStatusResponseBody.sendEventPostUri);
+                    Assert.NotNull(initialStatusResponseBody.purgeHistoryDeleteUri);
+                    Assert.NotNull(initialStatusResponseBody.terminatePostUri);
+                    Assert.NotNull(initialStatusResponseBody.rewindPostUri);
+                },
+                validateIntermediateResponse: (dynamic intermediateStatusResponseBody) =>
+                {
+                    var runtimeStatus = (string)intermediateStatusResponseBody.runtimeStatus;
+                    Assert.True(
+                        runtimeStatus == "Running" || runtimeStatus == "Pending",
+                        $"Unexpected runtime status: {runtimeStatus}");
+                },
+                validateFinalResponse: (dynamic finalStatusResponseBody) =>
+                {
+                    Assert.Equal("Completed", (string)finalStatusResponseBody.runtimeStatus);
+                    Assert.Equal("Hello Tokyo", finalStatusResponseBody.output[0].ToString());
+                    Assert.Equal("Hello Seattle", finalStatusResponseBody.output[1].ToString());
+                });
+        }
+
         [Fact]
         public async Task OrchestratorCanReceiveArrayFromActivity()
         {

test/E2E/durableApp/FanOutOnInputOrchestrator/function.json

@@ -0,0 +1,9 @@
+{
+  "bindings": [
+    {
+      "name": "Context",
+      "type": "orchestrationTrigger",
+      "direction": "in"
+    }
+  ]
+}

test/E2E/durableApp/FanOutOnInputOrchestrator/run.ps1

@@ -0,0 +1,19 @@
+using namespace System.Net
+
+param($Context)
+
+$ErrorActionPreference = 'Stop'
+
+$output = @()
+
+# We call an activity for every element in the input list.
+# This allows us to test that array-type inputs are correctly serialized.
+# In the past, we've seen issues where arrays are received as JTokens instead of as PS lists.
+# Since we cannot iterate over JTokens, an incorrectly serialized array will result in no activities being called. Our test will then error.
+foreach ($input in $Context.Input)
+{
+    # invoke the activity function
+    $output += Invoke-DurableActivity -FunctionName "Hello" -Input $input
+}
+
+return $output

test/E2E/durableApp/SubOrchestratorWithArrayInput/function.json

@@ -0,0 +1,9 @@
+{
+  "bindings": [
+    {
+      "name": "Context",
+      "type": "orchestrationTrigger",
+      "direction": "in"
+    }
+  ]
+}

test/E2E/durableApp/SubOrchestratorWithArrayInput/run.ps1

@@ -0,0 +1,10 @@
+using namespace System.Net
+
+param($Context)
+
+$ErrorActionPreference = 'Stop'
+
+$output = @()
+$output += Invoke-DurableSubOrchestrator -FunctionName "FanOutOnInputOrchestrator" -Input @("Tokyo", "Seattle")
+
+return $output