create daily/unlimited mode, CDN audio file for daily mode

2 files changed, 25 insertions, 4 deletions

diff --git a/server/data/songs.ts b/server/data/songs.ts
index 08e9230..7a1ebf8 100644
--- a/server/data/songs.ts
+++ b/server/data/songs.ts
@@ -422,7 +422,6 @@ export const songs = [
   { artist: "aespa", name: "Flights, Not Feelings", youtubeId: "Qe7FP1abS5s" },
   { artist: "LE SSERAFIM", name: "HOT", youtubeId: "cCkAcVOS3ig" },
   { artist: "i-dle", name: "Allergy", youtubeId: "Gcp87-ZegRA" },
-  { artist: "NewJeans", name: "Get Up", youtubeId: "SXM1q0CTfew" },
   { artist: "9MUSES", name: "Dolls", youtubeId: "QM58UGunHKY" },
   { artist: "Red Velvet", name: "Cosmic", youtubeId: "46FxItq18h0" },
   { artist: "ILLIT", name: "Midnight Fiction", youtubeId: "Sr7dWdf4Z3U" },
diff --git a/server/index.ts b/server/index.ts
index c78352a..54b3c18 100644
--- a/server/index.ts
+++ b/server/index.ts
@@ -25,10 +25,32 @@ function xorBuffer(data: Buffer, key: Buffer): Buffer {
   return output;
 }
 
+function getUtcDate(): string {
+  return new Date().toISOString().slice(0, 10);
+}
+function hashString(str: string): number {
+  let hash = 0;
+  for (let i = 0; i < str.length; i++) {
+    hash = (hash * 31 + str.charCodeAt(i)) >>> 0;
+  }
+  return hash;
+}
+
 app.get('/today', (_req, res) => {
-  const msInDay = 86_400_000;
-  const index = Math.floor((Date.now() - startDate.getTime()) / msInDay);
-  const song = songs[index % songs.length];
+  const date = getUtcDate();
+  const seed = hashString(date);
+  const index = seed % songs.length;
+  const song = songs[index];
+  const obfuscationKey = getObfuscationKey();
+  const songJson = JSON.stringify(song);
+  const obfuscatedData = xorBuffer(Buffer.from(songJson, 'utf8'), obfuscationKey);
+  res.json({
+    data: obfuscatedData.toString('hex'),
+  });
+});
+
+app.get('/select', (_req, res) => {
+  const song = songs[Math.floor(Math.random() * songs.length)];
   const obfuscationKey = getObfuscationKey();
   const songJson = JSON.stringify(song);
   const obfuscatedData = xorBuffer(Buffer.from(songJson, 'utf8'), obfuscationKey);