fix(usage): read Cursor token from modern state.vscdb key via node:sqlite (#2704)

* fix(usage): read Cursor token from modern state.vscdb key via node:sqlite

Settings → Usage showed Cursor as unavailable for a normal Cursor desktop
login. The quota fetcher read the access token from the legacy `cursorAuthStatus`
key, but current Cursor builds store a plain JWT under `cursorAuth/accessToken`
with no such legacy row, so the lookup returned null.

Read the token with built-in node:sqlite instead of shelling out to a `sqlite3`
CLI (absent by default on Windows) — a second, independent cause of the same
"token not found → unavailable" failure. Prefer the modern key, fall back to the
legacy `cursorAuthStatus` blob for older builds, and log read failures at debug
so an unavailable card stays diagnosable.

Fixes #2586

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* test(usage): cover Cursor sqlite text and blob auth

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: Mohamed Boudra <boudra.moha@gmail.com>

packages/server/src/services/quota-fetcher/service.test.ts

@@ -1,6 +1,7 @@
 import { existsSync, mkdirSync, readFileSync, writeFileSync } from "node:fs";
 import { mkdtempSync, rmSync } from "node:fs";
 import { promises as fsPromises } from "node:fs";
+import { createRequire } from "node:module";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
@@ -58,6 +59,31 @@ function writeKimiCredentials(dir: string, accessToken: string, overrides: objec
   );
 }
 
+// node:sqlite has no @types/node@20 typings; require it with a narrow local type.
+const testRequire = createRequire(import.meta.url);
+interface TestSqliteDb {
+  exec(sql: string): void;
+  prepare(sql: string): { run(...params: unknown[]): void };
+  close(): void;
+}
+
+// Cursor builds have stored ItemTable values as both TEXT and BLOB. Keys map to the
+// real layouts: a plain modern token or the legacy JSON object.
+function writeCursorStateDb(homeDir: string, rows: Record<string, string | Uint8Array>): void {
+  const dir = join(homeDir, ".config", "Cursor", "User", "globalStorage");
+  mkdirSync(dir, { recursive: true });
+  const { DatabaseSync } = testRequire("node:sqlite") as {
+    DatabaseSync: new (path: string) => TestSqliteDb;
+  };
+  const db = new DatabaseSync(join(dir, "state.vscdb"));
+  db.exec("CREATE TABLE IF NOT EXISTS ItemTable (key TEXT UNIQUE ON CONFLICT REPLACE, value BLOB)");
+  const insert = db.prepare("INSERT INTO ItemTable (key, value) VALUES (?, ?)");
+  for (const [key, value] of Object.entries(rows)) {
+    insert.run(key, value);
+  }
+  db.close();
+}
+
 function writeGrokAuth(home: string, auth: Record<string, unknown>): void {
   mkdirSync(join(home, ".grok"), { recursive: true });
   writeFileSync(join(home, ".grok", "auth.json"), JSON.stringify(auth));
@@ -372,6 +398,7 @@ describe("real provider usage fetchers", () => {
       platform?: typeof process.platform;
       keychain?: () => Promise<unknown | null>;
       kimiHomeDir?: string;
+      cursorHomeDir?: string;
       miniMaxConfigPath?: string;
       miniMaxCredentialsPath?: string;
     } = {},
@@ -392,7 +419,11 @@ describe("real provider usage fetchers", () => {
         }),
         new CodexQuotaProvider({ logger, codexHome, fetch: fetchThroughTestDouble }),
         new CopilotQuotaProvider({ logger, fetch: fetchThroughTestDouble }),
-        new CursorQuotaProvider({ logger, fetch: fetchThroughTestDouble }),
+        new CursorQuotaProvider({
+          logger,
+          fetch: fetchThroughTestDouble,
+          homeDir: options.cursorHomeDir,
+        }),
         new ZaiQuotaProvider({ logger, fetch: fetchThroughTestDouble }),
         new GrokQuotaProvider({
           logger,
@@ -702,6 +733,75 @@ describe("real provider usage fetchers", () => {
     });
   });
 
+  it("reads the Cursor token from the modern cursorAuth/accessToken key in state.vscdb", async () => {
+    writeCursorStateDb(homeDir, { "cursorAuth/accessToken": "cursor_state_jwt" });
+    let authorization: string | null = null;
+    fetchApi = (async (url: RequestInfo | URL, init?: RequestInit) => {
+      authorization = (init?.headers as Record<string, string> | undefined)?.Authorization ?? null;
+      return jsonResponse({
+        planUsage: {
+          totalSpend: "1500",
+          includedSpend: "1000",
+          bonusSpend: "500",
+          remaining: "2500",
+          limit: "4000",
+        },
+        billingCycleStart: "2026-01-14T12:42:14.000Z",
+        billingCycleEnd: "2026-02-14T12:42:14.000Z",
+      });
+    }) as unknown as typeof fetch;
+
+    const cursor = findProvider(await service({ cursorHomeDir: homeDir }).listUsage(), "cursor");
+
+    expect(authorization).toBe("Bearer cursor_state_jwt");
+    expect(cursor).toMatchObject({
+      status: "available",
+      balances: [expect.objectContaining({ id: "plan_usage", used: 15, remaining: 25, limit: 40 })],
+    });
+  });
+
+  it("falls back to the legacy cursorAuthStatus JSON blob when the modern key is absent", async () => {
+    writeCursorStateDb(homeDir, {
+      cursorAuthStatus: Buffer.from(JSON.stringify({ accessToken: "cursor_legacy_jwt" }), "utf8"),
+    });
+    let authorization: string | null = null;
+    fetchApi = (async (url: RequestInfo | URL, init?: RequestInit) => {
+      authorization = (init?.headers as Record<string, string> | undefined)?.Authorization ?? null;
+      return jsonResponse({
+        planUsage: { totalSpend: "0", remaining: "100", limit: "100" },
+        billingCycleStart: null,
+        billingCycleEnd: null,
+      });
+    }) as unknown as typeof fetch;
+
+    const cursor = findProvider(await service({ cursorHomeDir: homeDir }).listUsage(), "cursor");
+
+    expect(authorization).toBe("Bearer cursor_legacy_jwt");
+    expect(cursor.status).toBe("available");
+  });
+
+  it("logs a debug diagnostic and stays unavailable when state.vscdb is unreadable", async () => {
+    const dir = join(homeDir, ".config", "Cursor", "User", "globalStorage");
+    mkdirSync(dir, { recursive: true });
+    writeFileSync(join(dir, "state.vscdb"), "not a sqlite database");
+    const logger = createLogger();
+    const provider = new CursorQuotaProvider({
+      logger,
+      fetch: (() => {
+        throw new Error("usage API should not be called without a token");
+      }) as unknown as typeof fetch,
+      homeDir,
+    });
+
+    const usage = await provider.fetchUsage();
+
+    expect(usage.status).toBe("unavailable");
+    expect((logger as unknown as { debug: ReturnType<typeof vi.fn> }).debug).toHaveBeenCalledWith(
+      expect.objectContaining({ path: expect.stringContaining("state.vscdb") }),
+      expect.stringContaining("Failed to read Cursor token"),
+    );
+  });
+
   it("fetches Z.ai usage from ZAI_API_KEY", async () => {
     process.env["ZAI_API_KEY"] = "zai_test_token";
     fetchApi = mockFetch(