MeWeb/CLAUDE.md

# CLAUDE.md — MeWeb quick reference

Read `AGENT.md` first and cite `PATTERNS.md` for code rules. This file holds commands, the map and the pitfalls.

## Commands

```bash
dotnet build src/MeWeb.Desktop/MeWeb.Desktop.csproj
dotnet run --project src/MeWeb.Desktop
dotnet run --project src/MeWeb.Server                     # ASPNETCORE_URLS=http://127.0.0.1:5481
dotnet run tools/setup.cs -- --group jdk                   # pinned JDK 21 into tools/jdk
dotnet run tools/setup.cs -- --group packaging             # pinned nfpm into tools/packaging
dotnet build src/MeWeb.Android/MeWeb.Android.csproj \
  -p:JavaSdkDirectory=$PWD/tools/jdk/linux-x64/jdk-21.0.12+8 -p:AndroidSdkDirectory=$HOME/Android/Sdk
dotnet run --project tools/Screenshots -- dist/screenshots [en,it,...]
tools/release.sh notes                                     # artifacts/release-notes.md alone, nothing built
dotnet run tools/strings.cs -- check                       # every language against English
dotnet run tools/strings.cs -- set Key values.json         # one key, every language at once
dotnet run tools/strings.cs -- merge keys.json             # many keys: {"Key": {"en": "…", "it": "…"}}
dotnet run tools/strings.cs -- import fr fr.json           # one language's drafts: {"Key": "…"}
dotnet run tools/strings.cs -- quote                       # put every “me-web?” between its language's quotation marks
dotnet run tools/knowledge.cs                              # provider map -> artifacts/knowledge/ip2asn.bin
dotnet run tools/languages.cs                              # regenerate data/languages.json from CLDR
dotnet publish src/MeWeb.Desktop -c Release -r win-x64 --self-contained -p:PublishSingleFile=true \
  -p:IncludeNativeLibrariesForSelfExtract=true -p:EnableCompressionInSingleFile=true
dotnet publish src/MeWeb.Desktop -c Release -r osx-arm64 --self-contained
```

The Android workload installs into the user SDK (`dotnet workload install android`); the system SDK in `/opt/dotnet`
is root-owned, so CI uses the runner user's own `~/.dotnet` (passolo's `tools/release.sh` pattern).

## Repository, CI and the variables they read

| Name | Where | What |
|---|---|---|
| `GITEA_URL` | shell, optional | Gitea base URL for `tools/gitea/*.sh`; default `https://git.thepra.dev` |
| `GITEA_ORG` | shell, optional | organisation; default `Arasaka` |
| `GITEA_REPO` | shell, optional | repository for `set_secret.sh`; default `MeWeb` |
| (git credential store) | `~/.git-credentials` | the only Gitea authentication the scripts use: `git credential fill` for `git.thepra.dev` |
| `MEWEB_KEYSTORE_B64` | Actions secret | the Android keystore, base64 (`tools/gitea/set_secret.sh`) |
| `MEWEB_KEYSTORE_PASS` | Actions secret | its password (store and key share it), alias `meweb` |
| `GITEA_TOKEN` | Actions, automatic | the job token; `release.sh` uses it as `RELEASE_TOKEN` to create the release and attach files |
| `VERSION`, `COMMIT` | job env | written by `.gitea/scripts/prepare.sh` from `Directory.Build.props` and the commit |
| `MEWEB_KEYSTORE` | release step | a temporary file in `$RUNNER_TEMP` decoded by `.gitea/scripts/android.sh`, removed on exit |

`build.yml` runs on every push to `master`; `release.yml` on a `v*` tag (publishes the Gitea release) or by hand
(`publish: false` builds every platform and deploys the server only). Both run on the Arasaka org runner `nuvola`,
user `gitea-runner`, home `/var/lib/gitea-runner`: `tools/sdk.sh` installs the SDK from `global.json` into its
`~/.dotnet` (the system SDK in `/opt/dotnet` is older and root-owned), and the JDK, nfpm and the Android SDK are
cached in `~/.cache/meweb`. There is deliberately no `pull_request` trigger: the runner is the production box.

The server's one-time root setup is `deploy/max/setup.sh` (user `meweb`, `/var/www/meweb.arasaka.software`,
`/etc/meweb/meweb.env`, the unit, the runner's sudoers line, the certificate, nginx), run on the box through
`arasaka.software`'s `tools/max/run.sh`.

The Android release key: alias `meweb`, certificate SHA-256
`5f52cff4f52f4e0b6da6cd044bfceaf78d1d42db24f2470602db7f19cbfdf846`. Never regenerate it.

## Map

| Path | What |
|---|---|
| `src/MeWeb.Shared` | `Endpoints.cs` (routes and hosts), wire contracts, `MeWebJsonContext`, generated `BuildInfo` |
| `src/MeWeb.Core` | the checks, no UI: `Net/` (address kinds, local network, TTL route, STUN, the probe's `Answerer`, DNS, speed, the device), `Router/` (UPnP IGD, NAT-PMP, PCP; `PortMapper` opens and removes mappings, `Leftovers` remembers them across a crash), `Mail/` (port 25, reverse name, blocklists through the user's resolver), `Knowledge/` (provider map and profiles), `History/` (checks, shared submissions), `Checks/` (`CheckRunner`, `Verdicts`, `Reach`, `Uses`, `ServerProbe`, `SharePayload`) |
| `src/MeWeb.App` | Avalonia views and view models, `Services/Localizer.cs` (+ `{s:Tr Key}`), `Strings/<code>.json`, `Resources/Colors.axaml`; `Resources/Icons.axaml` (Lucide, 24 units, for cards and lists) and `Resources/Art.axaml` (the path's drawings, 48 units: `Art<Name>Base`, up to three `Beat`s that pulse in turn while the step is checked and take its verdict colour, and a `Spin` for the globe). The path is a vertical zig-zag of `PathNodeViewModel`s, and the same nodes carry the result cards (`Cards`, regrouped by `MainViewModel.Home`), so a step in the path and its group of cards are one object |
| `src/MeWeb.Desktop` | desktop head (`meweb` executable), Windows manifest |
| `src/MeWeb.Android` | Android head (`software.arasaka.meweb`), resources, manifest |
| `src/MeWeb.Server` | `meweb.arasaka.software`: `/api/info`, `/api/ip`, the download page `/` and `/privacy` (en, it), `/download/{platform}` from the latest Gitea release, the probe (`/api/probe/ticket`, `/api/probe/{id}`) and shared findings (`/api/share`, files under `/var/lib/meweb/shares`, swept after `KeepDays`) |
| `data/languages.json` | 113 languages: code, autonym, English name, `rtl`, `reviewed` or `draft`, and `quotes`, the language's own quotation marks from CLDR (fixed by hand where CLDR has none or is wrong) |
| `data/glossary/<code>.json` | per language, the plain words chosen for about forty recurring ideas (provider, router, port, name server, …), so a card never calls one thing by two names; written with the translations and read by whoever reviews them |
| `data/isps/*.json` | provider profiles: AS numbers, and per fact a value, who said it (`basis`), the source URL and the month |
| `data/observed.json` | notes counted from shared findings and accepted by a person: per AS number and line (`home`, `mobile`), IPv4 shared or public, IPv6 offered or not, port 25, each with how many networks agree; embedded in every release |
| `src/MeWeb.Server/ObservedNotes.cs` | every six hours (with the share sweep) counts the shared findings into `/var/lib/meweb/observed.json` on the box: one vote per /24 or /48, the latest check of each network, the publisher's own network left out; nothing is served |
| `tools/observed.cs` | `show` prints that count, `accept <file> AS<n>/<line> ...` copies the ready notes (at least 5 networks, 4 in 5 agreeing) into `data/observed.json` |
| `src/MeWeb.Server/KnowledgeFeeder.cs` | refreshes the open network data under `/var/lib/meweb/knowledge` every six hours (iptoasn daily, DB-IP monthly, eight RouteViews RIBs weekly through `bzcat` (one or two collectors per continent, `Collectors`; each counts once per network in `UpstreamTally`, and a path's first AS, the collector's own neighbour, is never taken for an upstream), the AOSP carrier list weekly), builds `ip2asn.bin`, `networks.bin`, `carriers.json` and `SOURCES.txt` with `MeWeb.Core/Knowledge/Sources.cs`, and serves them at `/api/knowledge` |
| `tools/knowledge.cs` | takes the server's knowledge files (`MEWEB_KNOWLEDGE_URL`, default the public server; the release sets `http://127.0.0.1:5480` after deploying the server first) into `artifacts/knowledge/`, checking each SHA-256, and falls back to building `ip2asn.bin` alone from iptoasn (`--local` forces that); `MeWeb.Core` embeds whatever is there; `tools/release.cs` runs it before every app build |
| `tools/setup.cs` + `setup.json` | pinned build tools |
| `tools/Screenshots` | headless renders of every view in every language |
| `branding/` | the icon (SVG source, PNG, ICO) |

## Pitfalls

- **A TTL ping needs an empty payload off-root.** .NET on Linux falls back to the `ping` utility without
  `CAP_NET_RAW` and refuses any custom buffer ("Unable to send custom ping payload"); `SendPingAsync(target, timeout, [],
  new PingOptions(ttl, false))` works and reports `TimeExceeded` with the hop's address.
- **A 100.64.x.x hop is not proof of CGNAT.** The owner's Dimensione line has a public IPv4 on the FRITZ!Box and still
  shows `100.64.255.255` as hop 2. Only the router's own WAN address compared with the echo decides; hops are a hint.
- **Routers answer the SSDP search they don't implement.** The FRITZ!Box 5530 answers an IGD:2 search while describing
  itself as IGD:1; the version comes from the description's `deviceType`. Its PCP answers `NOT_AUTHORIZED` (2).
- **`HeadlessUnitTestSession.Dispatch` builds a fresh `Application` each call**, and `AttachDeveloperTools` throws the
  second time: the screenshot tool does the real check and every shot inside one `Dispatch`.
- **Fluent's `Expander` paints its header from resources** (`ExpanderHeaderBackground`, …), not from `Background`; the
  `Expander.explain` style overrides them in `Style.Resources`.
- **The probe never trusts the client for a target.** A ticket is bound to the address the server saw, single use,
  60 s; the run refuses any other caller address, private and CGNAT space, and `Probe:Refuse` (the box's own
  addresses, so the owner cannot probe himself from home). `Probe__AllowPrivate=true` exists for a local server only.
- **Ask the outside STUN server first.** When `stun.meweb` is the caller's own public address (the owner's line), the
  first binding hairpins inside the FRITZ!Box with the port preserved and the next destination reuses that mapping,
  so the order `stun.nextcloud.com` then `stun.meweb` is what reads a symmetric NAT as hard.
- **Shared findings are files, not Mongo.** The box's Mongo has auth on and “me-web?” has no user there; a file per
  submission under the unit's `StateDirectory`, with only the delete token's SHA-256, needs no credentials.
- **An address inside right-to-left text reorders around `→`.** `Texts.Isolate` wraps every literal value in U+2068/U+2069.
- **On mobile data there is no router of the user's.** Android reports a gateway for the cellular link, so
  `CheckRunner` skips the router protocols on a mobile link, and a private or 100.64 address on the device with a
  different public echo is the operator's NAT (`NatKind.Shared`); before 0.4 a phone on Iliad read "router not
  answering" and "can't tell" everywhere downstream. Provider profiles describe home lines, so on mobile the card says so.
- **The publisher's own network measures the house, not the line.** When the public IPv4 equals the server's, or
  the IPv6 shares its /48 (`Addresses.SameNetwork`, `RunReport.OwnNetwork`), everything aimed at the server loops
  back through the FRITZ!Box: the NAT type, the port burst, hairpin, lifetime, speed and round trip. Those cards then
  say `ReachOwnNetwork` and the burst is not sent; before 0.5.3 a home report read "hard NAT" next to "ports kept".
- **One verdict decides who holds the IPv4.** `Verdicts.Holder(NatOf(...))` feeds both the address card and the
  provider card's "On this line" row, so a home router behind CGNAT can no longer read "your router" on one card and
  "shared with other customers" on the next. Provider notes that the check contradicts (sharing, port 25) get that row
  right under them, added when the provider card is settled again at the end of the run.
- **The route is drawn, never trusted.** `Route.Trace` (8 TTLs) feeds the path's wires: hops after the first, up to
  the first public one, sit before the shared exit or the provider; public ones carry their AS number into the
  internet; unanswered runs collapse to "…". The NAT verdict never reads them (see the 100.64 pitfall).
- **A note from shared findings never ships without a person.** The consent screen and the privacy page promise
  "only totals without addresses, after a person has reviewed them, from at least five networks agreeing four in
  five"; `ObservedFact.Ready` is that rule, `tools/observed.cs accept` the review. Hand-written profile facts win over
  observed ones; observed facts fill the gaps, and on mobile data they replace the home-line profile entirely.
- **The knowledge build must fit the unit's `MemoryMax=512M`.** It peaked at 551 MB with Server GC on a 32-core
  machine; workstation GC (the server's csproj), streaming hashes and streaming the iptoasn ranges into compact
  tuples brought it to about 335 MB. Re-measure (`VmHWM`) after touching `Sources.cs` or `AsnTable.Write`.
- **The server cannot ping**: `NoNewPrivileges` drops `ping`'s file capability and `ping_group_range` is closed, so
  the trace back to a caller uses `tracepath` (UDP, unprivileged) and keeps only public hops outside `Probe:Refuse`,
  so the box's own network never reaches an app.
- **Port facts are a lower bound.** Sixteen bindings see a few ports of a provider's block; the block estimate
  widens with each check on the same public address (`HistoryStore.PortRange`), so "up to about N customers" is an
  upper bound that only falls over time. The mapping lifetime test (30 s and 120 s) runs after the check and updates
  the card; a NAT that reuses the same port after expiry reads as "kept".
- **5G non-standalone reports LTE** as the data network type; the display-info callback (Android 12+) gives the
  override the status bar shows. The radio type needs `READ_BASIC_PHONE_STATE` (Android 13+), asked during the
  first check on mobile data.
- **Download speed is timed after the first quarter of the sample**, once TCP has ramped up: on mobile the sample is
  2 MB and the whole-transfer figure was mostly the ramp.
- **A Lucide icon joined from several SVG elements must start each one with an absolute `M`.** A leading `m` is
  absolute only as a path's first command; joined after another element it becomes relative and draws outside the box.
  The shield and the radio tower did that until 0.3; check new geometry by walking its points against 24 (or 48).
- **On Android `GC.GetGCMemoryInfo().TotalAvailableMemoryBytes` is the runtime's limit, not the RAM** (0.1 GB on a
  phone with several): `AndroidPlatform` reads `ActivityManager.MemoryInfo.TotalMem`, Linux `/proc/meminfo`.
- **`DriveInfo` on Unix takes any path** (it calls `statvfs`): pass the app's folder, not `/`, or Android reads the
  read-only root and reports no free disk at all.
- **An IPv6 address only wraps at a colon if it is allowed to**: the path's detail lines put U+200B after each colon;
  they are plain `TextBlock`s for that reason, so a copy never carries the invisible character (the cards' values,
  which are selectable, stay untouched).

- **Avalonia 12 Android head:** `[Application] MainApplication : AvaloniaAndroidApplication<App>` plus a non-generic
  `AvaloniaMainActivity`; the main view comes through `IActivityApplicationLifetime.MainViewFactory`, checked before
  `ISingleViewApplicationLifetime`.
- **`ApplicationVersion` must be an integer**: computed from `Version` through separate `VersionMajor/Minor/Patch`
  properties; one nested property function left it unevaluated (`XA0003`).
- **A headless Avalonia session does not end on its own** while the pulse animation runs: the screenshot tool calls
  `Environment.Exit(0)` after dispatching.
- **Launchers and the Android 12 splash crop the icon to their own shape.** The launcher icon is the adaptive
  `mipmap-anydpi-v26/icon.xml` (background colour, `drawable/icon_foreground.xml`, `drawable/icon_monochrome.xml` for
  themed icons), and the splash uses the same foreground. Both vectors hold `branding/meweb.svg`'s drawing scaled into
  the central 66 of 108 units around its smallest enclosing circle; a change to the drawing goes into all three files.
  The plain `mipmap-xxxhdpi/icon.png` is only for Android 7.x.
- **Release notes are the commits since the previous tag.** `tools/release.cs` writes "What's new" from each
  commit's subject (without the `"me-web?" x.y:` prefix, quoted or not) and body, dropping trailers and any line that mentions Claude;
  the release step needs `fetch-depth: 0` for the tags. So a commit body is written for the people who download the
  release: plain words, one bullet per change they would notice.
- **The name is always quoted, in each language's own marks.** “me-web?” in English, «me-web?» in Italian, „me-web?“
  in German, « me-web? » (no-break spaces) in French, 「me-web?」 in Japanese: unquoted, the question mark reads as the
  end of a sentence ("What me-web? found"). `tools/strings.cs check` fails on a bare name; `AppName` is the title. In
  right-to-left languages the `Localizer` wraps the name in U+2066/U+2069 (left-to-right isolate), the English fallback
  included: without it Avalonia lays out ”me-web?“ alone on a line as `me-web?”“`, and inside a sentence the `?`
  jumps to the other end of the name. A left-to-right mark after the name was tried and does not fix the lone title.
- **Avalonia 12 refreshes an indexer binding only on `PropertyChanged("Item")`.** `{s:Tr Key}` binds `Localizer.Instance[Key]`;
  the WPF name `"Item[]"` and `""` refresh nothing, so until 0.7.1 changing the language left every `{s:Tr}` text in
  the old one while the view models' `*Formatted` strings followed. The screenshot tool draws each `start-<code>`
  shot by switching from English on a live view, which is the check that would have caught it.
- **The first screen sells the outcome, not the test.** `Views/HomeOrbit` draws the home's router with the six uses
  circling it on a tilted ring (depth from scale, opacity and z-order, one turn in 40 s, frames from
  `RequestAnimationFrame` only while it is visible); the question, one sentence of why, the button and the six uses
  as chips follow, and the QR codes wait folded at the bottom. While a check runs, the share card sits at the end in
  a muted "getting them ready" state (`ShowSharePreparing`) and turns into the offer when the findings are complete.
- **Values worth copying are read-only text boxes with a copy button inside** (`Views/CopyField`): addresses, the
  router, the network, the reverse name, the route, the STUN answers and a submission's code. The box is
  left-to-right in every language and copies the raw value, never the bidi marks `Texts.Isolate` adds to display
  text. Which facts get one is the `Copyable` list in `FactViewModel`.
- **The macOS apphost is ad-hoc signed by the .NET 10 SDK even on Linux** (`LC_CODE_SIGNATURE` present); Apple
  Silicon refuses unsigned arm64 code, so never strip it.
- **The Windows single-file publish drops native `.pdb` files beside the exe**; only `meweb.exe` ships.