Add login system

auth/auth.js

@@ -0,0 +1,68 @@
+const db = require("../modules/db");
+
+function session_decode(session) {
+    let decode;
+    try {
+        decode = JSON.parse(Buffer.from(session, 'base64').toString('ascii'));
+    } catch (e) {
+        decode = {'user_id': 0, 'session_token': 'xxx'};
+    }
+    return decode;
+}
+
+function session_converter(session) {
+    let data = session_decode(session);
+    const conn = db.connect();
+    let key = new Promise(function (res, rej) {
+        conn.query(
+            "SELECT * FROM users WHERE id = ?",
+            [data.user_id],
+            function (error, response, fields) {
+                if (error) {
+                    rej(error);
+                } else {
+                    try {
+                        let session_data = JSON.parse(response[0].session);
+                        let filtered_session = session_data.filter( x => x.session == data.session_token);
+                        if (filtered_session.length > 0 && response[0].verify == '1') {
+                            res(response[0].token);
+                        } else {
+                            res(null);
+                        }
+                    } catch (e) {
+                        res(null);
+                    }
+                }
+            }
+        );
+    });
+    return key;
+}
+
+function auth_checker(key) {
+    const conn = db.connect();
+    let status = new Promise(function (res, rej) {
+        conn.query(
+            "SELECT * FROM users WHERE token = ?",
+            [key],
+            async function (error, response, fields) {
+                if (error) {
+                    rej(error);
+                } else {
+                    if (!response[0]) {
+                        res(true);
+                    } else {
+                        res(false);
+                    }
+                }
+            }
+        );
+    });
+    return status;
+}
+
+module.exports = {
+    session_decode,
+    session_converter,
+    auth_checker
+};