Swagger parser (#30)

* add support to parse Swagger format

* eslint fixes

* adjusts required by revision to swagger parser

Author: arojunior

src/index.js

@@ -2,3 +2,4 @@ export Api from "./Api";
 export Resource from "./Resource";
 export Field from "./Field";
 export * from "./hydra";
+export * from "./swagger";

src/swagger/handleJson.js

@@ -0,0 +1,51 @@
+import { get, uniq } from "lodash";
+import Field from "../Field";
+import Resource from "../Resource";
+
+export const removeTrailingSlash = url => {
+  if (/\/$/.test(url)) {
+    url = url.slice(0, -1);
+  }
+  return url;
+};
+
+export default function(response, entrypointUrl) {
+  const paths = uniq(
+    Object.keys(response.paths).map(item => item.replace(`/{id}`, ``))
+  );
+
+  const resources = paths.map(item => {
+    const name = item.replace(`/`, ``);
+    const url = removeTrailingSlash(entrypointUrl) + item;
+    const firstMethod = Object.keys(response.paths[item])[0];
+    const title = response.paths[item][firstMethod]["tags"][0];
+    const fieldNames = Object.keys(response.definitions[title].properties);
+
+    const fields = fieldNames.map(
+      fieldName =>
+        new Field(fieldName, {
+          id: null,
+          range: null,
+          reference: null,
+          required: !!response.definitions[title].required.find(
+            value => value === fieldName
+          ),
+          description: get(
+            response.definitions[title].properties[fieldName],
+            `description`,
+            ``
+          )
+        })
+    );
+
+    return new Resource(name, url, {
+      id: null,
+      title,
+      fields,
+      readableFields: fields,
+      writableFields: fields
+    });
+  });
+
+  return resources;
+}