Added openapi related classes

src/loaders/openapi.ts

@@ -0,0 +1,24 @@
+import { validationMetadatasToSchemas } from "@odit/class-validator-jsonschema";
+import express, { Application } from "express";
+import path from 'path';
+import { getMetadataArgsStorage } from "routing-controllers";
+import { generateSpec } from '../apispec';
+
+/**
+ * Loader for everything openapi related - from creating the schema to serving it via a static route and swaggerUiExpress.
+ * All auth schema related stuff also has to be configured here
+ */
+export default async (app: Application) => {
+  const storage = getMetadataArgsStorage();
+  const schemas = validationMetadatasToSchemas({
+    refPointerPrefix: "#/components/schemas/",
+  });
+
+  //Spec creation based on the previously created schemas
+  const spec = generateSpec(storage, schemas);
+  app.get(["/api/docs/openapi.json", "/api/docs/swagger.json"], (req, res) => {
+    res.json(spec);
+  });
+  app.use('/api/docs', express.static(path.join(__dirname, '../static/docs'), { index: "index.html", extensions: ['html'] }));
+  return app;
+};