add getUserID and tests

src/app.ts

@@ -32,6 +32,7 @@ import {endpoint as getSegmentInfo} from './routes/getSegmentInfo';
 import {postClearCache} from './routes/postClearCache';
 import { addUnlistedVideo } from './routes/addUnlistedVideo';
 import {postPurgeAllSegments} from './routes/postPurgeAllSegments';
+import {getUserID} from './routes/getUserID';
 
 export function createServer(callback: () => void) {
     // Create a service (the app object is just a callback).
@@ -146,6 +147,9 @@ function setupRoutes(app: Express) {
     app.post('/api/purgeAllSegments', postPurgeAllSegments);
 
     app.post('/api/unlistedVideo', addUnlistedVideo);
+    
+    // get userID from username
+    app.get('/api/userID', getUserID);
 
     if (config.postgres) {
         app.get('/database', (req, res) => dumpDatabase(req, res, true));

src/routes/getUserID.ts

@@ -0,0 +1,29 @@
+import {db} from '../databases/databases';
+import {Logger} from '../utils/logger';
+import {Request, Response} from 'express';
+
+export async function getUserID(req: Request, res: Response) {
+    let username = req.query.username as string;
+
+    if (username == undefined) {
+        //invalid request
+        res.sendStatus(400);
+        return;
+    }
+    
+    // add wildcard to variable
+    username = `%${username}%`
+    try {
+        let rows = await db.prepare('all', `SELECT "userName", "userID" FROM "userNames" WHERE "userName" LIKE ?`, [username]);
+        if (rows.length === 0) {
+            res.sendStatus(404);
+            return;
+        } else {
+            res.send(rows);
+        }
+    } catch (err) {
+        Logger.error(err);
+        res.sendStatus(500);
+        return;
+    }
+}