support adding to spotify playlist

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

@@ -0,0 +1,28 @@
+import { log } from '$lib/log';
+import { SpotifyPlaylistAdder } from '$lib/server/spotifyPlaylistAdder';
+import { redirect } from '@sveltejs/kit';
+import type { PageServerLoad } from './$types';
+
+export const load: PageServerLoad = async ({ url }) => {
+  const adder = new SpotifyPlaylistAdder();
+  let redirectUri = url;
+  if (url.hostname === 'localhost') {
+    redirectUri.hostname = '127.0.0.1';
+  }
+  log.debug(url.searchParams, url.hostname);
+  if (url.searchParams.has('code')) {
+    await adder.receivedAuthCode(url.searchParams.get('code') || '', url);
+    redirect(307, '/');
+  } else if (url.searchParams.has('error')) {
+    log.error('received error', url.searchParams.get('error'));
+    return;
+  }
+
+  if (await adder.authCodeExists()) {
+    redirect(307, '/');
+  }
+
+  const authUrl = adder.constructAuthUrl(url);
+  log.debug('+page.server.ts', authUrl.toString());
+  redirect(307, authUrl);
+};

src/routes/spotifyAuth/+page.svelte

@@ -0,0 +1 @@
+<h1>Something went wrong</h1>

src/routes/ytauth/+page.svelte

@@ -1,2 +1 @@
-<h1>Hello and welcome to my site!</h1>
-<a href="/about">About my site</a>
+<h1>Something went wrong</h1>