1 files changed, 30 insertions, 0 deletions
diff --git a/src/server/api/get-params.ts b/src/server/api/get-params.ts
new file mode 100644
index 0000000000..6b047a28f4
--- /dev/null
+++ b/src/server/api/get-params.ts
@@ -0,0 +1,30 @@
+import { Query } from 'cafy';
+
+type Defs = {
+	params: {[key: string]: {
+		def: Query<any>;
+		default?: any;
+	}}
+};
+
+export default function <T extends Defs>(defs: T, params: any): [{
+	[P in keyof T['params']]: ReturnType<T['params'][P]['def']['get']>[0];
+}, Error] {
+	const x: any = {};
+	let err: Error = null;
+	Object.keys(defs.params).some(k => {
+		const [v, e] = defs.params[k].def.get(params[k]);
+		if (e) {
+			err = e;
+			return true;
+		} else {
+			if (v === undefined && defs.params[k].default) {
+				x[k] = defs.params[k].default;
+			} else {
+				x[k] = v;
+			}
+			return false;
+		}
+	});
+	return [x, err];
+}