fix: allow object value

.changes/nextrelease/fix-object-value-validation.json

@@ -0,0 +1,7 @@
+[
+    {
+        "type": "bugfix",
+        "category": "",
+        "description": "Allow `stdClass` in `Validator` for document types for empty documents to be encoded as JSON objects rather than arrays."
+    }
+]

src/Api/Validator.php

@@ -2,6 +2,7 @@
 namespace Aws\Api;
 
 use Aws;
+use stdClass;
 
 /**
  * Validates a schema against a hash of input.
@@ -292,6 +293,12 @@ private function checkAssociativeArray($value)
 
     private function checkDocumentType($value)
     {
+        // To allow objects like value, which
+        // can be used within a member which type is `Document`
+        if ($value instanceof stdClass) {
+            $value = (array) $value;
+        }
+
         if (is_array($value)) {
             $typeOfFirstKey = gettype(key($value));
             foreach ($value as $key => $val) {

tests/Api/ValidatorTest.php

@@ -616,6 +616,25 @@ public function validationProvider()
                 "Found 1 error while validating the input provided for the Foo operation:\n"
                 . "[unionVal] is a union type and must have exactly one non null value"
             ],
+            [
+                [
+                    'type' => 'structure',
+                    'members' => [
+                        'documentMember' => [
+                            'type' => 'structure',
+                            'members' => [],
+                            'document' => true,
+                        ]
+                    ]
+                ],
+                [
+                    'documentMember' => [
+                        'type' => 'object',
+                        'properties' => (object) []
+                    ]
+                ],
+                true
+            ]
         ];
     }