Fix #44, additional minor enhncements

src/routes/tidalAuth/+page.server.ts

@@ -0,0 +1,39 @@
+import { BASE_URL } from '$env/static/private';
+import { Logger } from '$lib/log';
+import { redirect } from '@sveltejs/kit';
+import type { PageServerLoad } from './$types';
+import { TidalPlaylistAdder } from '$lib/server/playlist/tidalPlaylistAdder';
+import { URL } from 'node:url';
+const { DEV } = import.meta.env;
+
+const logger = new Logger('TidalAuth');
+
+export const load: PageServerLoad = async ({ url, request }) => {
+  const forwardedHost = request.headers.get('X-Forwarded-Host');
+  let redirect_base;
+  if (DEV) {
+    redirect_base = url.origin;
+  } else if (forwardedHost) {
+    redirect_base = `${url.protocol}//${forwardedHost}`;
+  } else {
+    redirect_base = BASE_URL;
+  }
+  const redirect_uri = new URL(`${redirect_base}${url.pathname}`);
+  const adder = new TidalPlaylistAdder();
+  logger.debug(url.searchParams, url.hostname, redirect_uri);
+  if (url.searchParams.has('code')) {
+    await adder.receivedAuthCode(url.searchParams.get('code') || '', redirect_uri);
+    redirect(307, '/');
+  } else if (url.searchParams.has('error')) {
+    logger.error('received error', url.searchParams.get('error'));
+    return;
+  }
+
+  if (await adder.authCodeExists()) {
+    redirect(307, '/');
+  }
+
+  const authUrl = adder.constructAuthUrl(redirect_uri);
+  logger.debug('+page.server.ts', authUrl.toString());
+  redirect(307, authUrl);
+};