Aurora SpotiRip desktop and web app

- Spotify playlist, library, album and artist browsing with in-app playback
- Song, playlist and album downloads via spotdl with YouTube and Bandcamp fallbacks
- Electron desktop app (castLabs Widevine) with a permanent sidebar layout
- Linux and Windows packaging scripts

endpoints/spotify-auth_GET.ts

@@ -0,0 +1,43 @@
+import { makeCookie, SPOTIFY_REDIRECT_URI } from "../helpers/spotifyServer";
+
+export async function handle() {
+  try {
+    const clientId = process.env.SPOTIFY_CLIENT_ID;
+    if (!clientId) {
+      return new Response("Spotify client ID is not configured.", { status: 500 });
+    }
+
+    const state = crypto.randomUUID().replace(/-/g, "");
+    const scopes = [
+      "playlist-read-private",
+      "playlist-read-collaborative",
+      "streaming",
+      "user-read-email",
+      "user-read-private",
+      "user-read-playback-state",
+      "user-modify-playback-state",
+      "user-library-read",
+      "user-follow-read",
+    ].join(" ");
+
+    const params = new URLSearchParams({
+      client_id: clientId,
+      response_type: "code",
+      redirect_uri: SPOTIFY_REDIRECT_URI,
+      scope: scopes,
+      state,
+      show_dialog: "false",
+    });
+
+    const headers = new Headers({
+      Location: `https://accounts.spotify.com/authorize?${params.toString()}`,
+      "Cache-Control": "no-store",
+    });
+    headers.append("Set-Cookie", makeCookie("spotirip_oauth_state", state, { maxAge: 600 }));
+
+    return new Response("Redirecting to Spotify…", { status: 302, headers });
+  } catch (error) {
+    const message = error instanceof Error ? error.message : "Unable to start Spotify login.";
+    return new Response(message, { status: 500 });
+  }
+}