feat: body reading, loop fingerprint body_hash, GeoIP/ASN config (#9, #13, #15)

[levleontiev]

Implements three open issues:

• fix: read request body in reverse_proxy mode for token estimation and body descriptor source #9: Read request body in reverse_proxy mode; populate request_context.body and request_context.body_hash (SHA-256)
• bug: loop detector fingerprint does not include request body hash — identical POST requests not distinguished #13: Include body_hash in loop detector fingerprint for POST/PUT/PATCH
• bug: GeoIP/ASN lookup not configured in nginx.conf — ip:country and ip:asn descriptors only work via upstream headers #15: Wire geoip2 Country + ASN lookups in nginx.conf.template; add libmaxminddb0 to Dockerfile

Code authored by @gemini-cli, PR opened by @claude.

[levleontiev]

Code Review — PR #19 (Issues #9, #13, #15)

#9 — Body reading ✅ (with one note)

• read_body() + get_body_file() fallback: correct, addresses @codex high-severity gap
• utils.to_hex(utils.sha256(body)) safe: nil propagates without crash
• Scoped correctly to reverse_proxy + POST/PUT/PATCH

⚠️ Nice-to-fix: No body size guard — a 100 MB body would be fully read into memory. Add a content-length cap before reading.

#13 — Loop fingerprint body_hash ✅

Clean. build_fingerprint appends body_hash after query_params, before limit_key_values. No issues.

#15 — GeoIP/ASN 🚨 Two blockers + artifact cleanup

🚨 BLOCKER 1: ngx_http_geoip2_module not installed
The geoip2 directive is not part of the base openresty/openresty:1.25.3.2-jammy image. The Dockerfile installs libmaxminddb0 (C lib) but not the nginx module — nginx will fail with unknown directive "geoip2". Fix:

RUN opm get leev/ngx_http_geoip2_module

🚨 BLOCKER 2: MMDB database files not provided
/etc/geoip2/GeoLite2-Country.mmdb and GeoLite2-ASN.mmdb are referenced but never downloaded or mounted — nginx will fail at startup. Need at minimum: documentation that files must be volume-mounted, or a download hook in entrypoint.sh gated on MAXMIND_LICENSE_KEY.

🚫 Artifacts committed
artifacts/e2e-full/compose.log (+370/-76086 lines) and junit.xml should not be committed. Add artifacts/ to .gitignore.

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Verdict: REQUEST_CHANGES — #9 and #13 are good to go, #15 needs the two blockers resolved and artifacts removed.

[levleontiev]

Follow-up Review ✅ APPROVED

Все три блокера устранены:

Body size cap ✅ — string_sub(body, 1, 1048576) для in-memory + f:read(1048576) для file-backed. Чисто.

opm get leev/ngx_http_geoip2_module ✅ — добавлен в Dockerfile корректно.

Артефакты ✅ — compose.log и junit.xml удалены, artifacts/ в .gitignore.

MMDB check в entrypoint.sh ⚠️ note: предупреждение напечатается, но nginx всё равно упадёт с ошибкой если файлы отсутствуют (geoip2 модуль не работает без баз). Рекомендую поменять на exit 1 с понятным сообщением — но это не блокер, можно followup-issue.

PR #19 готов к мержу. @шеф