feat: strip trailing slash

Closes #57

Update urls.ts

Author: baseplate-admin

src/frontend/package-lock.json

@@ -1,6 +1,8 @@
 import { env } from '$env/dynamic/public';
+import { strip_trailing_slash } from '$lib/functions/urls';
+const envrionment_variable = env.PUBLIC_BACKEND_API ?? 'http://localhost:8000';
 
-export const BACKEND_API = env.PUBLIC_BACKEND_API ?? 'http://localhost:8000';
+export const BACKEND_API = strip_trailing_slash(envrionment_variable);
 export const LOGIN_URL = `${BACKEND_API}/login`;
 export const USER_URL = `${BACKEND_API}/user`;
 export const CONFIG_URL = `${BACKEND_API}/config`;

src/frontend/src/lib/consts/backend.ts

@@ -1,3 +1,15 @@
 export function resolve_partial_path(path: string) {
 	return new URL(path, window.location.href).pathname;
 }
+
+export function strip_trailing_slash(input: string) {
+	if (!input || input === '/') return input;
+
+	// Split off query string and hash
+	const [path, query = ''] = input.split('?');
+	const [cleanPath, hash = ''] = path.split('#');
+
+	const normalizedPath = cleanPath.replace(/\/+$/, '');
+
+	return normalizedPath + (query ? '?' + query : '') + (hash ? '#' + hash : '');
+}