4 commits squashed into 1 due to force-push via API. See PR #229 body for full description.
Key changes:
- cookie_auth: polling loop (10s) instead of single count() snapshot (race fix)
- cookie_auth: env var DOUYIN_COOKIE_AUTH_HEADLESS for linux server headless override
- _extract_douyin_qrcode_src: 4-tier selector fallback (animate_qrcode_container)
- _wait_for_douyin_login: 2FA detection with warning
- export_douyin_cookie: USERNAME from os.environ
- ks/xiaohongshu uploader: chromium default + cdp_url support for ks
The Douyin creator center UI (https://creator.douyin.com/creator-micro/) has been refactored and breaks the existing login flow in three independent ways. This commit fixes all of them.
1. QR code selector no longer matches
The previous selector chain assumed the QR sat in a sibling div with an aria-label of 二维码. After the refactor, the QR is rendered as a base64 PNG inside div#animate_qrcode_container and has no aria-label. The new chain is a 4-tier fallback (id -> class partial -> container partial -> aria-label) preceded by a networkidle wait so the SPA is fully hydrated before we look.
2. cookie_auth() race condition
page.goto + wait_for_url(5000) + immediate get_by_text count() was racy: the SPA had not finished hydrating, so count() could return 0 even when the page actually shows the login card, leading to false-positive 'cookie valid' results. Replaced with a 10s polling loop that returns invalid if neither the login-card text nor the upload-page text is observed.
3. _wait_for_douyin_login() only waited for sessionid cookie (120s)
During 2FA the cookie is not yet set; the page is still on the verification screen and the URL has already changed. The new loop detects 2FA input fields, logs a warning so the user knows to type the SMS code, and keeps polling. Timeout raised to 200s to accommodate the slower human-in-the-loop flow.
Verified the selector chain against the live creator.douyin.com page: returns a 2.9 KB base64 PNG that decodes into a valid douyin scan_login URL.
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