fix: handle Listenarr CSRF antiforgery via cookie jar

backend/package.json

@@ -19,6 +19,7 @@
     "@solana/spl-token": "^0.4.14",
     "@solana/web3.js": "^1.87.6",
     "axios": "^1.6.2",
+    "axios-cookiejar-support": "^5.0.5",
     "bcryptjs": "^2.4.3",
     "cors": "^2.8.5",
     "dotenv": "^16.3.1",
@@ -30,6 +31,7 @@
     "jsonwebtoken": "^9.0.2",
     "morgan": "^1.10.0",
     "socket.io": "^4.7.3",
+    "tough-cookie": "^5.1.2",
     "tweetnacl": "^1.0.3",
     "ws": "^8.15.1"
   },

backend/src/services/listenarr.ts

@@ -1,16 +1,36 @@
-import axios from "axios";
+import axios, { type AxiosInstance } from "axios";
+import { wrapper } from "axios-cookiejar-support";
+import { CookieJar } from "tough-cookie";
 
 const LISTENARR_URL = process.env.LISTENARR_URL || "";
 const LISTENARR_API_KEY = process.env.LISTENARR_API_KEY || "";
 
-const listenarrApi = axios.create({
-  baseURL: LISTENARR_URL,
-  timeout: 15000,
-  headers: {
-    "X-Api-Key": LISTENARR_API_KEY,
-    "Content-Type": "application/json",
-  },
-});
+// ponytail: single shared cookie jar so CSRF cookies persist across requests
+const jar = new CookieJar();
+const listenarrApi: AxiosInstance = wrapper(
+  axios.create({
+    baseURL: LISTENARR_URL,
+    timeout: 15000,
+    headers: {
+      "Content-Type": "application/json",
+      ...(LISTENARR_API_KEY ? { "X-Api-Key": LISTENARR_API_KEY } : {}),
+    },
+    withCredentials: true,
+    jar,
+  }),
+);
+
+// ponytail: prime the antiforgery cookie on module load
+let csrfPrimed = false;
+async function ensureCsrfCookie(): Promise<void> {
+  if (csrfPrimed || LISTENARR_API_KEY) return;
+  try {
+    await listenarrApi.get("/api/v1/system/status");
+    csrfPrimed = true;
+  } catch {
+    // ignore — we just need the cookie set
+  }
+}
 
 export async function searchAudiobooks(
   query: string
@@ -38,10 +58,12 @@ export async function addAudiobook(options: {
   genres?: string[];
   series?: string;
   seriesNumber?: string;
-  isbn?: string;
+  isbn?: string[] | string;
   explicit?: boolean;
   abridged?: boolean;
 }): Promise<any> {
+  await ensureCsrfCookie();
+
   // Defensive: ensure series/seriesNumber are always strings, not arrays
   const series = typeof options.series === "string" ? options.series : "";
   const seriesNumber = typeof options.seriesNumber === "string" ? options.seriesNumber : "";