felhom-controller/controller/scripts/retrieval_promise_gate.py

#!/usr/bin/env python3
"""retrieval_promise_gate — pin the CLAIM, not the word (R-302).

WHY THIS IS NOT A STRING BAN. Five instances of "you can get your old backups back with your recovery
code" have surfaced ONE AT A TIME (R-294, R-299, and the two R-302 fixed this session), each found only
after the previous one was fixed. The obvious guard — forbid the sentence — was tried twice and failed
twice:

  * v0.211.0 asserted the SINGULAR „visszaállítható lehet"; the card carried the PLURAL
    „visszaállíthatók lehetnek" one paragraph above it and walked straight past (R-299).
  * Broadening to the stem `visszaállíthat` then missed the banner entirely, because the banner says
    „visszaszerezheted" — a different verb for the same claim.

AND THE STEM CANNOT BE BANNED. The honest replacement copy this session ships *contains the stem*:
„Hogy ezek még visszaszerezhetők-e … azt innen nem tudjuk megállapítani" is a QUESTION about
retrievability, and it is the correct sentence. A guard that forbade the stem would force the product
to avoid a normal Hungarian verb — a guard shaping the product around itself.

SO: every occurrence of a retrieval stem in a customer-facing template must be REGISTERED here with a
reason. Unregistered occurrences fail. The failure mode this actually catches is the real one — a new
claim appearing somewhere nobody was looking — without pretending a word is a claim.

Go template comments ({{/* … */}}) are stripped before scanning: html/template never renders them, so
prose explaining a fix is not a claim. HTML <!-- --> comments DO ship and are deliberately scanned.
"""
import os
import re
import sys

_HERE = os.path.dirname(os.path.abspath(__file__))
TEMPLATES = os.path.join(_HERE, "..", "internal", "web", "templates")

# R-311 — THE GATE HAD A BLIND SPOT THE SIZE OF THE RECOVERY SCREEN.
#
# It scanned `internal/web/templates` only. But every one of the recovery screen's messages is a Go
# STRING in a handler, not template text — including the four R-224 messages and the R-222/R-226 one,
# i.e. the highest-stakes customer copy in the product, on the one screen whose whole purpose is to be
# believed about someone's backups. None of it had ever been scanned.
#
# Go `//` and `/* */` comments are stripped for the same reason template comments are: they never
# reach a customer. (A `//` inside a Hungarian string literal would be stripped too — there are none,
# and a false NEGATIVE there is the safe direction for a guard that convicts on presence.)
GO_SOURCES = [
    os.path.join(_HERE, "..", "internal", "web", "recovery_handlers.py".replace(".py", ".go")),
]

# The verbs that carry the claim "your old backups can be got back".
# R-311 adds `visszanyit`: the honest new message says a customer needs support's help „a régebbi
# előzményed visszanyitásához". That is the SAME claim in a fourth verb, and the docstring above
# records what happens when the guard chases words instead of claims — it misses the next one.
STEMS = ["visszaállíthat", "visszaszerezhet", "visszahozhat", "visszanyit"]

# (template, substring that identifies the occurrence) -> why it is allowed.
# The substring must be specific enough that a DIFFERENT claim in the same file does not match it.
ALLOWLIST = {
    ("backups.html", "amelyből az egész készülék visszaállítható"):
        "the LOCAL whole-device backup, made and held by the host agent. Nothing to do with the "
        "off-site escrow claim — no recovery code is involved.",
    ("backups_apps.html", "alkalmazásonként visszaállítható"):
        "per-app restore from the local app-data backup. Same: local, no recovery code.",
    ("backups_remote.html", "mentéseid visszaszerezhetők.</strong>"):
        "the RecoveryOffer entry point. TRUE where it renders: it is gated on the hub telling this box "
        "it holds a sealed package for it, which is the claim being made. Deliberately left alone.",
    ("backups_remote.html", "a mentéseid visszaszerezhetők, és a törlés elmarad."):
        "the abandon block's promise — R-302 made it conditional on AbandonRetrievalOffered; this is "
        "the TRUE branch.",
    ("backups_remote.html", "Hogy ezek még visszaszerezhetők-e"):
        "R-302's cautious branch. Contains the stem inside a QUESTION about knowability — the sentence "
        "the gate exists to protect, not to forbid.",
    ("layout.html", "Addig még visszaszerezheted őket a helyreállítási kóddal."):
        "the banner's promise — R-302 made it conditional on RecoveryAbandonRetrievalOffered; TRUE branch.",
    ("layout.html", "Hogy ezek még visszaszerezhetők-e"):
        "R-302's cautious branch on the banner. As above.",
    ("recovery_handlers.go", "A régi előzmény visszanyitása felülírná azt"):
        "PRE-EXISTING and never scanned until R-311 extended this gate to Go handlers — which is the "
        "point of extending it. It is NOT a promise: it is the reason for a REFUSAL (RecoverRefused, "
        "a different repository password is already present), i.e. the sentence says the reopening "
        "would overwrite and was therefore not done. Registered as an explanation, not a claim.",
    ("recovery_handlers.go", "A régebbi előzményed visszanyitásához a Felhom ügyfélszolgálatának segítsége kell"):
        "R-311's truthful message for a code that opens a RETAINED package. It is a claim, and it is "
        "TRUE: the drill of 2026-08-12 recovered exactly this by hand (unsealed the retained package, "
        "opened the set-aside store, restored planted files byte-identical). It routes to SUPPORT "
        "rather than to a button precisely because there is no in-product route yet — the restore "
        "machinery resolves its repository from settings and its password from one file. If that route "
        "is ever built, this entry changes; if support ever cannot do it, this sentence must go.",
    ("recovery.html", "a mentéseid visszaszerezhetők, és a törlés elmarad;"):
        "the abandon CONFIRMATION screen, shown at the moment of the decision. True by construction "
        "there: the package the hub holds right now is the one about to be pinned. Left alone.",
}

TEMPLATE_COMMENT = re.compile(r"\{\{/\*.*?\*/\}\}", re.S)
GO_COMMENT = re.compile(r"//[^\n]*|/\*.*?\*/", re.S)


def scan():
    convictions, seen_keys = [], set()
    files = sorted(f for f in os.listdir(TEMPLATES) if f.endswith(".html"))
    sources = [(f, os.path.join(TEMPLATES, f), TEMPLATE_COMMENT) for f in files]
    for gp in GO_SOURCES:
        if not os.path.exists(gp):
            raise SystemExit(f"retrieval-promise gate: declared Go source is missing: {gp}")
        sources.append((os.path.basename(gp), gp, GO_COMMENT))
        files = files + [os.path.basename(gp)]
    for name, path, stripper in sources:
        text = stripper.sub("", open(path, encoding="utf-8").read())
        for stem in STEMS:
            for m in re.finditer(re.escape(stem) + r"[a-záéíóöőúüű]*", text):
                line = text[: m.start()].count("\n") + 1
                # SPAN-based, not window-based. The promise and the cautious disclaimer sit within a
                # hundred characters of each other in the same paragraph, so a proximity window matches
                # whichever key it tries first and reports the other as stale — which is exactly what a
                # first draft of this gate did. An occurrence belongs to an entry only if it falls
                # INSIDE that entry's own text.
                hit = None
                for k in (k for k in ALLOWLIST if k[0] == name):
                    for om in re.finditer(re.escape(k[1]), text):
                        if om.start() <= m.start() and m.end() <= om.end():
                            hit = k
                            break
                    if hit:
                        break
                if hit:
                    seen_keys.add(hit)
                else:
                    ctx = text[max(0, m.start() - 100): m.end() + 100]
                    convictions.append((name, line, m.group(0), " ".join(ctx.split())[:160]))
    return files, convictions, seen_keys


def main():
    files, convictions, seen = scan()
    stale = [k for k in ALLOWLIST if k not in seen]
    for name, line, word, ctx in convictions:
        print(f"  {name}:{line} unregistered retrieval claim ({word}):\n      …{ctx}…")
    for k in stale:
        print(f"  STALE ALLOWLIST ENTRY (no longer present): {k[0]} :: {k[1]!r}")
    if convictions or stale:
        print(f"\nRETRIEVAL-PROMISE GATE FAILED: {len(convictions)} unregistered, {len(stale)} stale, "
              f"across {len(files)} template(s).")
        print("Five instances of this claim have surfaced one at a time. If the new text is a genuine")
        print("claim, make it CONDITIONAL on what the box can see; if it is a question about")
        print("knowability, or an unrelated local-backup sentence, add it to ALLOWLIST with the reason.")
        return 1
    print(f"retrieval-promise gate OK — {len(files)} surface(s) incl. {len(GO_SOURCES)} Go handler file(s), "
          f"{len(ALLOWLIST)} registered claim(s), none unregistered")
    print("  (BLIND SPOT: it registers WHERE the claim is made, not whether each conditional is wired")
    print("   to a true predicate — that is what the R-302 render tests are for.)")
    return 0


if __name__ == "__main__":
    sys.exit(main())