Introduce processor

src/server/api/endpoints/username/available.ts

@@ -0,0 +1,32 @@
+/**
+ * Module dependencies
+ */
+import $ from 'cafy';
+import User from '../../models/user';
+import { validateUsername } from '../../models/user';
+
+/**
+ * Check available username
+ *
+ * @param {any} params
+ * @return {Promise<any>}
+ */
+module.exports = async (params) => new Promise(async (res, rej) => {
+	// Get 'username' parameter
+	const [username, usernameError] = $(params.username).string().pipe(validateUsername).$;
+	if (usernameError) return rej('invalid username param');
+
+	// Get exist
+	const exist = await User
+		.count({
+			host: null,
+			username_lower: username.toLowerCase()
+		}, {
+			limit: 1
+		});
+
+	// Reply
+	res({
+		available: exist === 0
+	});
+});