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+# Reddit scraper (anonymous, no browser)
+
+Platform-native Reddit scraper, Apify "Reddit Scraper"-compatible. Standalone
+module: it depends only on `app.utils.proxy` + `scrapling` and exposes a stable
+public API. It is **not** wired into routes, `connector_service.py`, ingestion,
+or Celery — integration later is a thin `reddit_routes.py` + one `include_router`
+line, identical to the `youtube` / `google_maps` siblings.
+
+## Approach
+
+Reddit deprecated **cold** unauthenticated `.json` (r/modnews, May 2026): a bare
+anonymous GET to `/…/.json` now 403s. What still works — and what maintained
+anonymous scrapers (e.g. yt-dlp) now do — is:
+
+> Bootstrap an anonymous session cookie (`loid`) with one plain HTTP GET to
+> `www.reddit.com/svc/shreddit/<slug>`, then GET
+> `www.reddit.com/<path>/.json?raw_json=1` through that same
+> Chrome-impersonated, sticky-IP session. Rotate the residential IP + re-warm on
+> block.
+
+`loid` is Reddit's equivalent of the Google Maps scraper's `NID`: an anonymous,
+logged-out id that unlocks the public API. **No browser, no Chromium, no
+`solve_cloudflare`** — this collapses Reddit onto the cheap HTTP tier the
+siblings already use. Confirmed live 2026-07-04 through a residential proxy (see
+`scripts/e2e_reddit_scraper.py` step 0): `svc/shreddit` warm-up → 200 + `loid`
+(with `old.reddit` as a fallback), then sequential `.json` fetches → 200.
+
+## Anonymous only — no authentication, ever
+
+No OAuth, no login, no `reddit_session` account cookie, no Devvit. The only
+cookie held is the anonymous `loid`. There is **no** authenticate option in the
+input surface or the fetch layer, by design. A persistent block after IP
+rotation surfaces as `RedditAccessBlockedError` (mirrors google_maps'
+`SignInRequiredError`) rather than a silent empty result.
+
+## Module map
+
+| File | Responsibility |
+|---|---|
+| `__init__.py` | Public exports: `RedditScrapeInput`, `RedditItem`, `iter_reddit`, `scrape_reddit`, `RedditAccessBlockedError`. |
+| `schemas.py` | Apify-shaped `RedditScrapeInput` (`extra="allow"`, no auth fields) + single flat `RedditItem` keyed by `dataType` + `StartUrl`. |
+| `fetch.py` | The core. Rotate-on-block sticky `_RotatingSession` + `_current_session` ContextVar + `warm_session` (loid) + `fetch_json`. No browser imports. |
+| `url_resolver.py` | Classify a Reddit URL → `post`/`subreddit`/`user`/`search`; non-Reddit → `None`. |
+| `parsers.py` | Pure JSON→item mapping (`parse_post`, `parse_comment`, `parse_community`, `flatten_comments`, `children`/`after`). I/O-free. |
+| `scraper.py` | Orchestrator: `_post_flow`/`_subreddit_flow`/`_user_flow`/`_search_flow`, `_paginate_listing`, `_dispatch`, `fan_out`, `iter_reddit`, `scrape_reddit`. |
+
+## How it works
+
+1. `iter_reddit` resolves `startUrls` (or builds a search per `searches` entry)
+   and fans them out on a pool of warm proxy sessions (`fan_out`, 16-way). Each
+   worker opens one sticky-IP session and warms `loid` once, reusing it across
+   the sequential targets it pulls.
+2. Each flow pages its listing via the `after` cursor (`_paginate_listing`),
+   filtering by child `kind`, the NSFW gate, and `postDateLimit`.
+3. `fetch_json` warms `loid` on first use, rotates the IP + re-warms on 403,
+   backs off on 429, returns `None` on 404, and paces each sticky IP to ~1 req/s
+   to stay under Reddit's per-IP rate limit.
+4. Parsers map raw `.json` things to flat `RedditItem`s; the orchestrator stamps
+   `scrapedAt` and applies caps as request-time policy.
+
+## Testing
+
+- Offline unit tests: `tests/unit/scrapers/reddit/` — `test_skeleton.py`
+  (schema + URL resolver), `test_parsers.py` (fixture-pinned mapping),
+  `test_fetch_resilience.py` (warm / rotate / backoff loop with fake sessions,
+  no network).
+- Live e2e (needs network + residential proxy): `scripts/e2e_reddit_scraper.py`
+  — step 0 is the go/no-go `loid` probe; later steps exercise the flows and dump
+  trimmed fixtures into `tests/unit/scrapers/reddit/fixtures/`.
+
+```bash
+cd surfsense_backend
+.venv/bin/python -m pytest tests/unit/scrapers/reddit/
+.venv/bin/python scripts/e2e_reddit_scraper.py   # live; regenerates fixtures
+```
+
+## TODO / out of scope (v1)
+
+- Sticky-IP provider support: the fetch layer assumes a sticky exit IP per
+  session (the `loid` binds to it). `anonymous_proxies` does not yet set the
+  `"si"` sticky key — add it (proxy layer) before high-volume production use.
+- `/api/morechildren` deep-comment expansion — `more` stubs terminate the tree
+  walk today.
+- Routes / `connector_service.py` / ingestion / Celery wiring.
+- RSS degraded-mode path (documented, not implemented).