feat(backend): login, most endpoints complete

backend/src/corsManager.ts

@@ -0,0 +1,56 @@
+import {
+    CorsOptions
+} from 'cors';
+import cors from 'cors';
+
+let corsWhitelist: string[] = [];
+
+const configure = ( whitelist: string[] ) => {
+    corsWhitelist = whitelist;
+};
+
+const middleware = ( rest: boolean = false ) => {
+    return cors( genCorsOpts( rest ) );
+};
+
+/**
+ * Generate the options for the CORS library
+ * @param rest - [OPTIONAL] Whether to allow REST requests or not
+ * @returns CORS options object that can be used for the cors library
+ */
+const genCorsOpts = ( rest: boolean = false ): CorsOptions => {
+    const corsOpts: CorsOptions = {
+        'credentials': true,
+        'optionsSuccessStatus': 200,
+        'origin': ( origin, cb ) => {
+            const status = blockREST( origin! );
+
+            cb( null, status );
+        }
+    };
+
+    if ( rest ) {
+        corsOpts[ 'origin' ] = ( origin, cb ) => {
+            const status = allowREST( origin! );
+
+            cb( null, status );
+        };
+    }
+
+    return corsOpts;
+};
+
+const blockREST = ( origin: string ): boolean => {
+    return corsWhitelist.includes( origin );
+};
+
+const allowREST = ( origin: string ): boolean => {
+    return blockREST( origin ) || !origin;
+};
+
+
+export default {
+    genCorsOpts,
+    configure,
+    middleware
+};