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# N2Usenet Architecture
## Components
- `cmd/n2usenet`: process entrypoint, lifecycle, HTTP server.
- `cmd/n2u-check`: SMTP diagnostic helper for direct or SOCKS5-routed checks.
- `internal/config`: environment-driven configuration.
- `internal/nymclient`: optional managed `nym-socks5-client` lifecycle.
- `internal/socks5`: minimal SOCKS5 dialer used for Nym transport.
- `internal/smtpclient`: SMTP + STARTTLS sender over an injected dialer.
- `internal/submit`: HTTP handlers, validation, message construction.
- `internal/storage`: replay cache for Hashcash tokens.
- `internal/assets/web`: embedded template and browser assets.
## Privacy Boundary
The HTTPS server necessarily receives browser connections. It should not persist
source IPs, user agents, raw posts, or submitted identities. Operational logs
must stay generic. Rate limiting uses an in-memory keyed hash of the source
address and resets on process restart. Hashcash replay protection is also
memory-only. The browser-side identity, signature inputs, and compose fields are
kept only in tab memory and cleared after successful send.
## Transport Boundary
The app never dials `mail2news.tcpreset.net` directly when `N2U_NYM_ENABLED=true`.
All SMTP traffic goes through `N2U_NYM_SOCKS`, normally provided by
`nym-socks5-client`.
The intended posting chain is:
```text
Browser -> HTTPS n2usenet.virebent.art
N2Usenet -> Nym SOCKS5/requester
Nym requester -> mail2news.tcpreset.net:25 SMTP with STARTTLS
mail2news@mail2news.tcpreset.net -> Mail2News gateway
Mail2News gateway -> news.tcpreset.net NNTP
```
## Deployment Boundary
The current onion PHP app remains deployed under Onion Newsreader `/compose/`.
This app is a separate HTTP service intended to be reverse-proxied by the
public HTTPS frontend for `https://n2usenet.virebent.art`, Apache on `pietro`
in the current production deployment.
Current production split:
- `victor` runs the dedicated Nym network requester.
- `pietro` runs the public HTTPS app and the local `nym-socks5-client`.
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