fix(.net): occasional incorrect param type cast

When structures (as literal JSON blocks) get passed through a "map"
argument, a `JObject` would be passed to the method despite the declared
type on the .NET code is `IDictionary`, resulting in a crash.

This code forcefully converts `JObject` to `IDictionary<string, objetc>`
in such code paths.

Fixes aws/aws-cdk#3093

packages/jsii-calc/lib/compliance.ts

@@ -1726,3 +1726,18 @@ export enum SingletonIntEnum {
     /** Elite! */
     SINGLETON_INT = 1337
 }
+
+/**
+ * Verifies proper type handling through dynamic overrides.
+ */
+export class DataRenderer {
+    constructor() { }
+
+    public render(data: MyFirstStruct = { anumber: 42, astring: 'bazinga!' }): string {
+        return this.renderMap(data);
+    }
+
+    public renderMap(map: { [key: string]: any }): string {
+        return JSON.stringify(map, null, 2);
+    }
+}

packages/jsii-calc/test/assembly.jsii

@@ -2082,6 +2082,79 @@
       ],
       "name": "ConsumersOfThisCrazyTypeSystem"
     },
+    "jsii-calc.DataRenderer": {
+      "assembly": "jsii-calc",
+      "docs": {
+        "stability": "experimental",
+        "summary": "Verifies proper type handling through dynamic overrides."
+      },
+      "fqn": "jsii-calc.DataRenderer",
+      "initializer": {
+        "docs": {
+          "stability": "experimental"
+        }
+      },
+      "kind": "class",
+      "locationInModule": {
+        "filename": "lib/compliance.ts",
+        "line": 1733
+      },
+      "methods": [
+        {
+          "docs": {
+            "stability": "experimental"
+          },
+          "locationInModule": {
+            "filename": "lib/compliance.ts",
+            "line": 1736
+          },
+          "name": "render",
+          "parameters": [
+            {
+              "name": "data",
+              "optional": true,
+              "type": {
+                "fqn": "@scope/jsii-calc-lib.MyFirstStruct"
+              }
+            }
+          ],
+          "returns": {
+            "type": {
+              "primitive": "string"
+            }
+          }
+        },
+        {
+          "docs": {
+            "stability": "experimental"
+          },
+          "locationInModule": {
+            "filename": "lib/compliance.ts",
+            "line": 1740
+          },
+          "name": "renderMap",
+          "parameters": [
+            {
+              "name": "map",
+              "type": {
+                "collection": {
+                  "elementtype": {
+                    "primitive": "any"
+                  },
+                  "kind": "map"
+                }
+              }
+            }
+          ],
+          "returns": {
+            "type": {
+              "primitive": "string"
+            }
+          }
+        }
+      ],
+      "name": "DataRenderer"
+    },
     "jsii-calc.DefaultedConstructorArgument": {
       "assembly": "jsii-calc",
       "docs": {
@@ -8778,5 +8851,5 @@
     }
   },
   "version": "0.13.2",
-  "fingerprint": "IzBpmwowWT7JOt7LEK9v3wIGmNWcpmqf9O1C927cs8o="
+  "fingerprint": "iCTmGcYc3DTgEt3Y8PBPaiJNOI7O9tRRGI49RI6rAwk="
 }

packages/jsii-dotnet-runtime-test/test/Amazon.JSII.Runtime.IntegrationTests/ComplianceTests.cs

@@ -915,6 +915,22 @@ public void CorrectlyReturnsFromVoidCallback()
             Assert.True(voidCallback.MethodWasCalled);
         }
 
+        [Fact(DisplayName = Prefix + nameof(CallbacksCorrectlyDeserializeArguments))]
+        public void CallbacksCorrectlyDeserializeArguments()
+        {
+            var obj = new DataRendererSubclass();
+            Assert.Equal("{\n  \"anumber\": 42,\n  \"astring\": \"bazinga!\"\n}", obj.Render(null));
+        }
+
+        class DataRendererSubclass : DataRenderer
+        {
+            [JsiiMethod("renderMap", returnsJson:  "{\"type\":{\"primitive\":\"string\"}}", parametersJson: "[{\"name\":\"map\",\"type\":{\"collection\":{\"kind\":\"map\",\"elementtype\":{\"primitive\":\"any\"}}}}]", isOverride: true)]
+            public override string RenderMap(IDictionary<string, object> map)
+            {
+                return base.RenderMap(map);
+            }
+        }
+
         class VoidCallbackImpl : VoidCallback
         {
             protected override void OverrideMe()

packages/jsii-dotnet-runtime/src/Amazon.JSII.Runtime/Amazon.JSII.Runtime.sln

@@ -0,0 +1,17 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Amazon.JSII.Runtime", "Amazon.JSII.Runtime.csproj", "{A31525BC-0422-446E-B7DE-92769D96302B}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{A31525BC-0422-446E-B7DE-92769D96302B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A31525BC-0422-446E-B7DE-92769D96302B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A31525BC-0422-446E-B7DE-92769D96302B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A31525BC-0422-446E-B7DE-92769D96302B}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

packages/jsii-dotnet-runtime/src/Amazon.JSII.Runtime/CallbackExtensions.cs

@@ -6,6 +6,7 @@
 using Amazon.JSII.Runtime.Services.Converters;
 using Newtonsoft.Json.Linq;
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
 
@@ -136,6 +137,17 @@ private static object FromKernel(object obj, IReferenceMap referenceMap)
                 {
                     return referenceMap.GetOrCreateNativeReference(new ByRefValue(prop.Value.Value<String>()));
                 }
+
+                var dict = ((JObject)obj).ToObject<Dictionary<string, object>>();
+                foreach (var key in dict.Keys)
+                {
+                    var value = dict[key];
+                    if (value != null && value.GetType() == typeof(JObject))
+                    {
+                        dict[key] = FromKernel(value, referenceMap);
+                    }
+                }
+                return dict;
             }
             return obj;
         }
@@ -145,7 +157,7 @@ internal class CallbackResult : OptionalValue
     {
         public CallbackResult(IOptionalValue optionalValue, object value)
             : this(optionalValue?.Type, optionalValue?.IsOptional ?? false, value) {}
-        
+
         private CallbackResult(TypeReference type, bool isOptional, object value): base(type, isOptional)
         {
             Value = value;

packages/jsii-pacmak/test/expected.jsii-calc/dotnet/Amazon.JSII.Tests.CalculatorPackageId/.jsii

@@ -2082,6 +2082,79 @@
       ],
       "name": "ConsumersOfThisCrazyTypeSystem"
     },
+    "jsii-calc.DataRenderer": {
+      "assembly": "jsii-calc",
+      "docs": {
+        "stability": "experimental",
+        "summary": "Verifies proper type handling through dynamic overrides."
+      },
+      "fqn": "jsii-calc.DataRenderer",
+      "initializer": {
+        "docs": {
+          "stability": "experimental"
+        }
+      },
+      "kind": "class",
+      "locationInModule": {
+        "filename": "lib/compliance.ts",
+        "line": 1733
+      },
+      "methods": [
+        {
+          "docs": {
+            "stability": "experimental"
+          },
+          "locationInModule": {
+            "filename": "lib/compliance.ts",
+            "line": 1736
+          },
+          "name": "render",
+          "parameters": [
+            {
+              "name": "data",
+              "optional": true,
+              "type": {
+                "fqn": "@scope/jsii-calc-lib.MyFirstStruct"
+              }
+            }
+          ],
+          "returns": {
+            "type": {
+              "primitive": "string"
+            }
+          }
+        },
+        {
+          "docs": {
+            "stability": "experimental"
+          },
+          "locationInModule": {
+            "filename": "lib/compliance.ts",
+            "line": 1740
+          },
+          "name": "renderMap",
+          "parameters": [
+            {
+              "name": "map",
+              "type": {
+                "collection": {
+                  "elementtype": {
+                    "primitive": "any"
+                  },
+                  "kind": "map"
+                }
+              }
+            }
+          ],
+          "returns": {
+            "type": {
+              "primitive": "string"
+            }
+          }
+        }
+      ],
+      "name": "DataRenderer"
+    },
     "jsii-calc.DefaultedConstructorArgument": {
       "assembly": "jsii-calc",
       "docs": {
@@ -8778,5 +8851,5 @@
     }
   },
   "version": "0.13.2",
-  "fingerprint": "IzBpmwowWT7JOt7LEK9v3wIGmNWcpmqf9O1C927cs8o="
+  "fingerprint": "iCTmGcYc3DTgEt3Y8PBPaiJNOI7O9tRRGI49RI6rAwk="
 }

packages/jsii-pacmak/test/expected.jsii-calc/dotnet/Amazon.JSII.Tests.CalculatorPackageId/Amazon/JSII/Tests/CalculatorNamespace/DataRenderer.cs

@@ -0,0 +1,39 @@
+using Amazon.JSII.Runtime.Deputy;
+using Amazon.JSII.Tests.CalculatorNamespace.LibNamespace;
+using System.Collections.Generic;
+
+namespace Amazon.JSII.Tests.CalculatorNamespace
+{
+    /// <summary>Verifies proper type handling through dynamic overrides.</summary>
+    /// <remarks>stability: Experimental</remarks>
+    [JsiiClass(nativeType: typeof(DataRenderer), fullyQualifiedName: "jsii-calc.DataRenderer")]
+    public class DataRenderer : DeputyBase
+    {
+        /// <remarks>stability: Experimental</remarks>
+        public DataRenderer(): base(new DeputyProps(new object[]{}))
+        {
+        }
+
+        protected DataRenderer(ByRefValue reference): base(reference)
+        {
+        }
+
+        protected DataRenderer(DeputyProps props): base(props)
+        {
+        }
+
+        /// <remarks>stability: Experimental</remarks>
+        [JsiiMethod(name: "render", returnsJson: "{\"type\":{\"primitive\":\"string\"}}", parametersJson: "[{\"name\":\"data\",\"type\":{\"fqn\":\"@scope/jsii-calc-lib.MyFirstStruct\"},\"optional\":true}]")]
+        public virtual string Render(IMyFirstStruct data)
+        {
+            return InvokeInstanceMethod<string>(new object[]{data});
+        }
+
+        /// <remarks>stability: Experimental</remarks>
+        [JsiiMethod(name: "renderMap", returnsJson: "{\"type\":{\"primitive\":\"string\"}}", parametersJson: "[{\"name\":\"map\",\"type\":{\"collection\":{\"kind\":\"map\",\"elementtype\":{\"primitive\":\"any\"}}}}]")]
+        public virtual string RenderMap(IDictionary<string, object> map)
+        {
+            return InvokeInstanceMethod<string>(new object[]{map});
+        }
+    }
+}

packages/jsii-pacmak/test/expected.jsii-calc/java/src/main/java/software/amazon/jsii/tests/calculator/$Module.java

@@ -38,6 +38,7 @@ protected Class<?> resolveClass(final String fqn) throws ClassNotFoundException
             case "jsii-calc.ConstructorPassesThisOut": return software.amazon.jsii.tests.calculator.ConstructorPassesThisOut.class;
             case "jsii-calc.Constructors": return software.amazon.jsii.tests.calculator.Constructors.class;
             case "jsii-calc.ConsumersOfThisCrazyTypeSystem": return software.amazon.jsii.tests.calculator.ConsumersOfThisCrazyTypeSystem.class;
+            case "jsii-calc.DataRenderer": return software.amazon.jsii.tests.calculator.DataRenderer.class;
             case "jsii-calc.DefaultedConstructorArgument": return software.amazon.jsii.tests.calculator.DefaultedConstructorArgument.class;
             case "jsii-calc.DeprecatedClass": return software.amazon.jsii.tests.calculator.DeprecatedClass.class;
             case "jsii-calc.DeprecatedEnum": return software.amazon.jsii.tests.calculator.DeprecatedEnum.class;

packages/jsii-pacmak/test/expected.jsii-calc/java/src/main/java/software/amazon/jsii/tests/calculator/DataRenderer.java

@@ -0,0 +1,47 @@
+package software.amazon.jsii.tests.calculator;
+
+/**
+ * Verifies proper type handling through dynamic overrides.
+ * 
+ * EXPERIMENTAL
+ */
+@javax.annotation.Generated(value = "jsii-pacmak")
+@software.amazon.jsii.Stability(software.amazon.jsii.Stability.Level.Experimental)
+@software.amazon.jsii.Jsii(module = software.amazon.jsii.tests.calculator.$Module.class, fqn = "jsii-calc.DataRenderer")
+public class DataRenderer extends software.amazon.jsii.JsiiObject {
+    protected DataRenderer(final software.amazon.jsii.JsiiObject.InitializationMode mode) {
+        super(mode);
+    }
+    /**
+     * EXPERIMENTAL
+     */
+    @software.amazon.jsii.Stability(software.amazon.jsii.Stability.Level.Experimental)
+    public DataRenderer() {
+        super(software.amazon.jsii.JsiiObject.InitializationMode.Jsii);
+        software.amazon.jsii.JsiiEngine.getInstance().createNewObject(this);
+    }
+
+    /**
+     * EXPERIMENTAL
+     */
+    @software.amazon.jsii.Stability(software.amazon.jsii.Stability.Level.Experimental)
+    public java.lang.String render(@javax.annotation.Nullable final software.amazon.jsii.tests.calculator.lib.MyFirstStruct data) {
+        return this.jsiiCall("render", java.lang.String.class, new Object[] { data });
+    }
+
+    /**
+     * EXPERIMENTAL
+     */
+    @software.amazon.jsii.Stability(software.amazon.jsii.Stability.Level.Experimental)
+    public java.lang.String render() {
+        return this.jsiiCall("render", java.lang.String.class);
+    }
+
+    /**
+     * EXPERIMENTAL
+     */
+    @software.amazon.jsii.Stability(software.amazon.jsii.Stability.Level.Experimental)
+    public java.lang.String renderMap(final java.util.Map<java.lang.String, java.lang.Object> map) {
+        return this.jsiiCall("renderMap", java.lang.String.class, new Object[] { java.util.Objects.requireNonNull(map, "map is required") });
+    }
+}