Socket connection now works

- Pairing a new device works

(I did a lot since the last commit)

backend/lib/crypto.ts

@@ -1,6 +1,7 @@
 import { hash, verify } from 'argon2';
+import { verify as jwtVerify } from 'jsonwebtoken';
 import { config } from '../config';
-import { IS_DEBUG, logger } from '../app';
+import { IS_DEBUG, JWT_SECRET, logger } from '../app';
 
 export async function hashPassword(input: string): Promise<string> {
     const start = Date.now();
@@ -64,9 +65,19 @@ export async function verifyPassword(password: string, hashInput: string): Promi
     });
 }
 
-export function randomString(length: number): string {
+export async function verifyJWT(token: string): Promise<boolean> {
+    return new Promise<boolean>(async (resolve, reject) => {
+        try {
+            jwtVerify(token, JWT_SECRET, { algorithms: ['HS256'] });
+            resolve(true);
+        } catch {
+            resolve(false);
+        }
+    });
+}
+
+export function randomString(length: number, characters: string = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'): string {
     let result           = '';
-    const characters       = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
     const charactersLength = characters.length;
     for ( let i = 0; i < length; i++ ) {
         result += characters.charAt(Math.floor(Math.random() * charactersLength));