add basic API

src/api.ts

@@ -0,0 +1,49 @@
+import { Router } from 'express';
+import { getGroupByID, getPostByID, getUserByID } from './data';
+
+export const router = Router();
+
+router.get('/user', (req, res) => {
+	if (typeof req.query.userID != 'string') {
+		return;
+	}
+
+	let userID = req.query.userID;
+	let user = getUserByID(userID);
+
+	if (user) {
+		res.json({ status: 'success', data: user });
+	} else {
+		res.json({ status: 'error', error: 'not_found' });
+	}
+});
+
+router.get('/post', (req, res) => {
+	if (typeof req.query.postID != 'string') {
+		return;
+	}
+
+	let postID = req.query.postID;
+	let post = getPostByID(postID);
+
+	if (post) {
+		res.json({ status: 'success', data: post });
+	} else {
+		res.json({ status: 'error', error: 'not_found' });
+	}
+});
+
+router.get('/group', (req, res) => {
+	if (typeof req.query.groupID != 'string') {
+		return;
+	}
+
+	let groupID = req.query.groupID;
+	let group = getGroupByID(groupID);
+
+	if (group) {
+		res.json({ status: 'success', data: group });
+	} else {
+		res.json({ status: 'error', error: 'not_found' });
+	}
+});