add getUserID and tests

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;
+    }
+}