[API] Add /instances

src/server/api/endpoints/instances.ts

+import $ from 'cafy';
+import define from '../define';
+import Instance from '../../../models/instance';
+
+export const meta = {
+	requireCredential: false,
+
+	params: {
+		limit: {
+			validator: $.num.optional.range(1, 100),
+			default: 30
+		},
+
+		offset: {
+			validator: $.num.optional.min(0),
+			default: 0
+		},
+
+		sort: {
+			validator: $.str.optional.or('+notes|-notes'),
+		}
+	}
+};
+
+export default define(meta, (ps, me) => new Promise(async (res, rej) => {
+	let _sort;
+	if (ps.sort) {
+		if (ps.sort == '+notes') {
+			_sort = {
+				notesCount: -1
+			};
+		} else if (ps.sort == '-notes') {
+			_sort = {
+				notesCount: 1
+			};
+		}
+	} else {
+		_sort = {
+			_id: -1
+		};
+	}
+
+	const instances = await Instance
+		.find({}, {
+			limit: ps.limit,
+			sort: _sort,
+			skip: ps.offset
+		});
+
+	res(instances);
+}));