Converts depencies to allOf[oneOf] stuff

Author: Phil Sturgeon

Diff for: README.md

@@ -7,7 +7,8 @@ A little NodeJS package to convert JSON Schema to [OpenAPI Schema Objects](https
 * converts JSON Schema Draft 00 Wright (a.k.a draft v5) to OpenAPI 3.0 Schema Object
 * switches `type: ['foo', 'null']` to `type: foo` and `nullable: true`
 * supports deep structures with nested `allOf`s etc.
-* switches `patternProperties` to `x-patternProperties` in the Schema Object
+* switches `patternProperties` to `x-patternProperties`
+* converts `dependencies` to an allOf + oneOf OpenAPI-valid equivalent
 
 ## Installation
 

Diff for: index.js

@@ -61,7 +61,9 @@ function convertSchema(schema) {
 	}
 
 	validateType(schema.type);
+
 	schema = convertTypes(schema);
+	schema = convertDependencies(schema);
 
 	if (typeof schema['patternProperties'] === 'object') {
 		schema = convertPatternProperties(schema);
@@ -80,10 +82,9 @@ function validateType(type) {
 }
 
 function convertProperties(properties) {
-	var key
-		, property
-		, props = {}
-	;
+	let key = {};
+	let property = {};
+	let props = {};
 
 	for (key in properties) {
 		property = properties[key];
@@ -93,6 +94,51 @@ function convertProperties(properties) {
 	return props;
 }
 
+function convertDependencies(schema) {
+	const deps = schema.dependencies;
+	if (typeof deps !== 'object') {
+		return schema;
+	}
+
+	// Turns the dependencies keyword into an allOf of oneOf's
+	// "dependencies": {
+	// 		"post-office-box": ["street-address"]
+	// },
+	//
+	// becomes
+	//
+	// "allOf": [
+	// 	{
+	// 		"oneOf": [
+	// 			{"not": {"required": ["post-office-box"]}},
+	// 			{"required": ["post-office-box", "street-address"]}
+	// 		]
+	// 	}
+	//
+
+	delete schema['dependencies'];
+	if (!Array.isArray(schema.allOf)) {
+		schema.allOf = [];
+	}
+
+	for (const key in deps) {
+		const foo = {
+			'oneOf': [
+				{
+					'not': {
+						'required': [key]
+					}
+				},
+				{
+					'required': [].concat(key, deps[key])
+				}
+			]
+		};
+		schema.allOf.push(foo);
+	}
+	return schema;
+}
+
 function convertTypes(schema) {
 	var newType;
 

Diff for: test/schemas/address/openapi.json

@@ -1,18 +1,28 @@
 {
-    "description": "An Address following the convention of http://microformats.org/wiki/hcard",
-    "type": "object",
-    "properties": {
-        "post-office-box": { "type": "string" },
-        "extended-address": { "type": "string" },
-        "street-address": { "type": "string" },
-        "locality":{ "type": "string" },
-        "region": { "type": "string" },
-        "postal-code": { "type": "string" },
-        "country-name": { "type": "string"}
+  "description": "An Address following the convention of http://microformats.org/wiki/hcard",
+  "type": "object",
+  "properties": {
+    "post-office-box": { "type": "string" },
+    "extended-address": { "type": "string" },
+    "street-address": { "type": "string" },
+    "locality":{ "type": "string" },
+    "region": { "type": "string" },
+    "postal-code": { "type": "string" },
+    "country-name": { "type": "string"}
+  },
+  "required": ["locality", "region", "country-name"],
+  "allOf": [
+    {
+      "oneOf": [
+        {"not": {"required": ["post-office-box"]}},
+        {"required": ["post-office-box", "street-address"]}
+      ]
     },
-    "required": ["locality", "region", "country-name"],
-    "x-json-schema-dependencies": {
-        "post-office-box": ["street-address"],
-        "extended-address": ["street-address"]
+    {
+      "oneOf": [
+        {"not": {"required": ["extended-address"]}},
+        {"required": ["extended-address", "street-address"]}
+      ]
     }
+  ]
 }