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/json-schema-components.js

@@ -1,8 +1,10 @@
 import React, { PureComponent, Component } from "react"
 import PropTypes from "prop-types"
 import { List, fromJS } from "immutable"
+import cx from "classnames"
 import ImPropTypes from "react-immutable-proptypes"
 import DebounceInput from "react-debounce-input"
+import { getSampleSchema } from "core/utils"
 //import "less/json-schema-form"
 
 const noop = ()=> {}
@@ -204,3 +206,53 @@ export class JsonSchema_boolean extends Component {
                     onChange={ this.onEnumChange }/>)
   }
 }
+
+export class JsonSchema_object extends PureComponent {
+  constructor() {
+    super()
+  }
+
+  static propTypes = JsonSchemaPropShape
+  static defaultProps = JsonSchemaDefaultProps
+
+  componentDidMount() {
+    if(!this.props.value && this.props.schema) {
+      this.resetValueToSample()
+    }
+  }
+
+  resetValueToSample = () => {
+    this.onChange(getSampleSchema(this.props.schema) )
+  }
+
+  onChange = (value) => {
+    this.props.onChange(value)
+  }
+
+  handleOnChange = e => {
+    const inputValue = e.target.value
+
+    this.onChange(inputValue)
+  }
+
+  render() {
+    let {
+      getComponent,
+      value,
+      errors
+    } = this.props
+
+    const TextArea = getComponent("TextArea")
+
+    return (
+      <div>
+        <TextArea
+          className={cx({ invalid: errors.size })}
+          title={ errors.size ? errors.join(", ") : ""}
+          value={value}
+          onChange={ this.handleOnChange }/>
+      </div>
+    )
+
+  }
+}