feat(chat): refresh agent credentials during tool calls

src/app/api/auth/[...nextauth]/options.test.ts

@@ -0,0 +1,59 @@
+import authOptions from "./options";
+
+describe("NextAuth access token refresh", () => {
+  it("forces a Keycloak refresh for an agent credential request", async () => {
+    const previousEnv = {
+      issuer: process.env.KEYCLOAK_ISSUER,
+      clientId: process.env.KEYCLOAK_CLIENT_ID,
+      clientSecret: process.env.KEYCLOAK_CLIENT_SECRET,
+    };
+    process.env.KEYCLOAK_ISSUER = "https://keycloak.example/realms/tjwater";
+    process.env.KEYCLOAK_CLIENT_ID = "frontend";
+    process.env.KEYCLOAK_CLIENT_SECRET = "secret";
+    const originalFetch = globalThis.fetch;
+    const fetchMock = jest.fn().mockResolvedValue({
+      ok: true,
+      json: async () => ({
+          access_token: "fresh-access-token",
+          expires_in: 900,
+          refresh_token: "rotated-refresh-token",
+      }),
+    });
+    globalThis.fetch = fetchMock as typeof fetch;
+
+    try {
+      const jwt = authOptions.callbacks?.jwt as (input: unknown) => Promise<{
+        accessToken?: string;
+        refreshToken?: string;
+      }>;
+      const result = await jwt({
+        token: {
+          accessToken: "still-fresh-access-token",
+          accessTokenExpires: Date.now() + 600_000,
+          accessTokenIssuedAt: Date.now(),
+          refreshToken: "refresh-token",
+        },
+        trigger: "update",
+        session: { forceRefresh: true },
+      });
+
+      expect(result.accessToken).toBe("fresh-access-token");
+      expect(result.refreshToken).toBe("rotated-refresh-token");
+      expect(fetchMock).toHaveBeenCalledWith(
+        "https://keycloak.example/realms/tjwater/protocol/openid-connect/token",
+        expect.objectContaining({ method: "POST" }),
+      );
+    } finally {
+      if (originalFetch) globalThis.fetch = originalFetch;
+      else delete (globalThis as { fetch?: typeof fetch }).fetch;
+      restoreEnv("KEYCLOAK_ISSUER", previousEnv.issuer);
+      restoreEnv("KEYCLOAK_CLIENT_ID", previousEnv.clientId);
+      restoreEnv("KEYCLOAK_CLIENT_SECRET", previousEnv.clientSecret);
+    }
+  });
+});
+
+const restoreEnv = (key: string, value: string | undefined) => {
+  if (value === undefined) delete process.env[key];
+  else process.env[key] = value;
+};