fix: Required properties warning now checked in child refs (#187)

README.md

@@ -269,6 +269,7 @@ The supported rules are described below:
 | property_case_collision     | Flag any property with a `name` that is identical to another property's `name` except for the naming convention | shared |
 | enum_case_convention        | Flag any enum with a `value` that does not follow a given case convention. snake_case_only must be 'off' to use.    | shared |
 | json_or_param_binary_string | Flag parameters or application/json request/response bodies with schema type: string, format: binary. | oas3 |
+| undefined_required_properties| Flag any schema with undefined required properties                       | shared   |
 
 ##### security_definitions
 | Rule                        | Description                                                                           | Spec   |
@@ -383,6 +384,7 @@ The default values for each rule are described below.
 | Rule                        | Default |
 | --------------------------- | ------- |
 | json_or_param_binary_string | warning |
+| undefined_required_properties    | warning |
 
 ##### shared
 

src/.defaultsForValidator.js

@@ -68,7 +68,8 @@ const defaults = {
       'inconsistent_property_type': 'warning',
       'property_case_convention': [ 'error', 'lower_snake_case'],
       'property_case_collision': 'error',
-      'enum_case_convention': [ 'warning', 'lower_snake_case']
+      'enum_case_convention': [ 'warning', 'lower_snake_case'],
+      'undefined_required_properties': 'warning'
     },
     'walker': {
       'no_empty_descriptions': 'error',

src/plugins/validation/2and3/semantic-validators/items-required-for-array-objects.js

@@ -10,8 +10,43 @@
 
 const { walk } = require('../../../utils');
 const MessageCarrier = require('../../../utils/messageCarrier');
+const at = require('lodash/at');
 
-module.exports.validate = function({ jsSpec }) {
+const reduceObj = function(jsSpec, obj) {
+  if (obj['$ref']) {
+    const objPath = obj['$ref'].split('/');
+    objPath.shift();
+    return reduceObj(jsSpec, at(jsSpec, [objPath])[0]);
+  }
+  return obj;
+};
+
+const checkReqProp = function(jsSpec, obj, requiredProp) {
+  obj = reduceObj(jsSpec, obj);
+  if (obj.properties && obj.properties[requiredProp]) {
+    return true;
+  } else if (Array.isArray(obj.anyOf) || Array.isArray(obj.oneOf)) {
+    const childList = obj.anyOf || obj.oneOf;
+    let reqPropDefined = true;
+    childList.forEach((childObj) => {
+      if (!checkReqProp(jsSpec, childObj, requiredProp)) {
+        reqPropDefined = false;
+      }
+    });
+    return reqPropDefined;
+  } else if (Array.isArray(obj.allOf)) {
+    let reqPropDefined = false;
+    obj.allOf.forEach((childObj) => {
+      if (checkReqProp(jsSpec, childObj, requiredProp)) {
+        reqPropDefined = true;
+      }
+    });
+    return reqPropDefined;
+  }
+  return false;
+}
+
+module.exports.validate = function({ jsSpec }, config) {
   const messages = new MessageCarrier();
 
   walk(jsSpec, [], function(obj, path) {
@@ -36,13 +71,14 @@ module.exports.validate = function({ jsSpec }) {
       }
 
       // Assertation 2
+      const undefinedRequiredProperties = config.schemas.undefined_required_properties;
       if (Array.isArray(obj.required)) {
         obj.required.forEach((requiredProp, i) => {
-          if (!obj.properties || !obj.properties[requiredProp]) {
+          if (!checkReqProp(jsSpec, obj, requiredProp)) {
             messages.addMessage(
               path.concat([`required[${i}]`]).join('.'),
-              "Schema properties specified as 'required' must be defined",
-              'error'
+              "Schema properties specified as 'required' should be defined",
+              undefinedRequiredProperties
             );
           }
         });