feature: OAS3 object parameter support (#4563)

* render suitable interface for `type: object` parameters

* validate OAS3 object parameters correctly

* display parameter validation errors

* remove irrelevant css classes

* rm comment

* fix failing tests

* add validateParam tests

* add enzyme tests for object parameter rendering

* run actual tests first

src/core/utils.js

@@ -503,7 +503,30 @@ export const validateParam = (param, isXml, isOAS3 = false) => {
     let numberCheck = type === "number" && (value || value === 0)
     let integerCheck = type === "integer" && (value || value === 0)
 
-    if ( required && !(stringCheck || arrayCheck || listCheck || fileCheck || booleanCheck || numberCheck || integerCheck) ) {
+    let oas3ObjectCheck = false
+
+    if(false || isOAS3 && type === "object") {
+      if(typeof value === "object") {
+        oas3ObjectCheck = true
+      } else if(typeof value === "string") {
+        try {
+          JSON.parse(value)
+          oas3ObjectCheck = true
+        } catch(e) {
+          errors.push("Parameter string value must be valid JSON")
+          return errors
+        }
+      }
+    }
+
+    const allChecks = [
+      stringCheck, arrayCheck, listCheck, fileCheck, booleanCheck,
+      numberCheck, integerCheck, oas3ObjectCheck
+    ]
+
+    const passedAnyCheck = allChecks.some(v => !!v)
+
+    if ( required && !passedAnyCheck ) {
       errors.push("Required field is not provided")
       return errors
     }