added users and groups

src/services/user.js

@@ -0,0 +1,36 @@
+import db from '../db.js'
+import statuses from '../utils/status.js';
+import bcrypt from 'bcrypt';
+
+class UserService {
+    async create (username, password) {
+        await db.query("INSERT INTO users (username, password) VALUES ($1, $2)", [username, bcrypt.hashSync(password, 12)]).catch (e => {
+            if (e.code == 23505) { // already exists
+                return statuses.duplicate
+            }
+        })
+        return statuses.ok
+    }
+
+    async getByUsername(username) {
+        let user = (await db.query("SELECT * FROM Users WHERE username = $1", [username])).rows
+        if (user == undefined) return statuses.not_found
+        return (user[0]);
+    }
+
+    async getAll() {
+        return (await db.query("SELECT * FROM Users")).rows;
+    }
+
+    async isInGroup(userId, groupId) {
+        return (await db.query("SELECT * FROM Users WHERE ID = $1 AND $2 = ANY(groups)", [userId, groupId])).rowCount > 0;
+    }
+
+    async joinGroup(userId, groupId) {
+        if (await (this.isInGroup(userId, groupId))) return statuses.duplicate;
+        await db.query("UPDATE Users SET groups = array_append(groups, $1::integer) WHERE ID = $2", [groupId, userId]);
+        return statuses.ok;
+    }
+}
+
+export default new UserService();