FAEA/walkthrough.md

Phase 1: Foundation (Headless-Plus) Walkthrough

1. Directory Structure Created

Scaffolded the following structure for FAEA:

/home/kasm-user/workspace/FAEA/
├── docker-compose.yml
├── Dockerfile
├── requirements.txt
├── src/
│   ├── core/
│   │   ├── session.py       # SessionState Class (Implemented)
│   │   └── handover.py      # HandoverValidator (Implemented)
│   ├── browser/
│   │   └── Dockerfile       # Camoufox Scaffolding
│   ├── extractor/
│   │   └── Dockerfile       # Curl Scaffolding
│   └── infra/
│       └── storage.py       # RedisStorage (Implemented)
└── tests/
    └── unit/
        └── test_session_core.py # Unit Verification

2. Infrastructure Scaffolding

Created docker-compose.yml defining services:

• Orchestrator: Python controller.
• Redis: Shared state store.
• Camoufox: Browser tier.
• Curl-Extractor: Network tier.

3. Verification Results

session.msgpack Serialization

Verified that SessionState correctly serializes to msgpack with HMAC signature and deserializes back.

Handover Protocol

Verified HandoverValidator logic for:

• User-Agent vs TLS Fingerprint consistency.
• sec-ch-ua header derivation from User-Agent.

Test Output:

tests/unit/test_session_core.py .. [100%]
2 passed in 0.06s

Phase 2: Core Components (Headless-Plus) Walkthrough

1. Implementation

• Browser Tier: Implemented CamoufoxManager in src/browser/manager.py.
  • Features: __aenter__/__aexit__ for memory safety, session state extraction.
• Extractor Tier: Implemented CurlClient in src/extractor/client.py.
  • Features: chrome120 impersonation, session consumption (Cookies/Headers).

2. Verification Results

Automated E2E Test (tests/e2e/test_handover.py)

• Status: PASSED.
• Scope: Verified that CurlClient successfully consumes SessionState extracted from CamoufoxManager and matches the User-Agent against a local mock server.

Manual TLS Verification (tests/manual/verify_tls.py)

• Status: FAILED (Expected Risk).
• Finding: Detected JA3 mismatch between Camoufox (Chromium) and CurlClient (curl_cffi).
  • Camoufox JA3: 9a9695ad9941a88944c373caf9333b57
  • CurlClient JA3: 3b0d0e7fc411345ff1917b0325186e26
• Implication: While Header consistency is achieved, TLS fingerprint identity is not yet perfect. This requires fine-tuning curl_cffi impersonation or matching the browser build more closely in Phase 3.

5. Next Steps

• Address TLS Mismatch (Phase 3).
• Implement persistent Redis loops.