Add boss schedule retrieval & parsing

services/decrypt.js

@@ -0,0 +1,44 @@
+const fs = require('node:fs');
+const path = require('node:path');
+const crypto = require('node:crypto');
+
+const BOSS_AES_KEY = process.env.BOSS_AES_KEY;
+const BOSS_HMAC_KEY = process.env.BOSS_HMAC_KEY;
+
+async function run() {
+    try {
+        if (!BOSS_AES_KEY || !BOSS_HMAC_KEY) {
+            process.stderr.write("decrypt: missing environment keys\n");
+            process.exit(1);
+        }
+
+        const data = fs.readFileSync(process.argv[2]);
+
+        const IV = Buffer.concat([
+            data.subarray(0x0C, 0x18),
+            Buffer.from([0x00, 0x00, 0x00, 0x01])
+        ]);
+
+        const decipher = crypto.createDecipheriv('aes-128-ctr', Buffer.from(BOSS_AES_KEY, 'hex'), IV);
+        const decrypted = Buffer.concat([decipher.update(data.subarray(0x20)), decipher.final()]);
+
+        const hmac = decrypted.subarray(0, 0x20);
+        const content = decrypted.subarray(0x20);
+
+        const calculatedHmac = crypto.createHmac('sha256', Buffer.from(BOSS_HMAC_KEY, 'hex'))
+            .update(content)
+            .digest();
+
+        if (!calculatedHmac.equals(hmac)) {
+            process.stderr.write("Console HMAC check failed. Is the key correct?\n");
+            process.exit(1);
+        }
+
+        process.stdout.write(content);
+    } catch (err) {
+        process.stderr.write(`decrypt.js: ${err.message}\n`);
+        process.exit(1);
+    }
+}
+
+run();