fix(sop-checklist): implement /sop-n/a N/A declarations + review-check 403 fix

Cherry-pick of infra/main-sop-na-fix N/A implementation + follow-up fixes.

N/A gate implementation (mc#1233 follow-up):
  - Adds separate _NA_DIRECTIVE_RE for /sop-n/a <gate> [reason] parsing.
  - parse_directives() now returns (directives, na_directives) tuple.
  - compute_na_state() evaluates N/A declarations per gate with
    team-membership probe (same 403 semantics as acks).
  - Posts 'sop-checklist / na-declarations (pull_request)' status
    with state=success when a gate is validly declared N/A by a
    non-author team member; state=failure otherwise.
  - review-check.sh reads this status to waive qa-review/security-review
    Gitea-APPROVE requirement when N/A is declared.

review-check 403 follow-up:
  - Team-membership API returns 403 if token owner is not in the team.
    Changed from exit 1 (hard-fail entire gate) to continue (skip this
    candidate, check others). Prevents a single 403 from blocking a gate
    when other valid team-members exist.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitea/scripts/review-check.sh

@@ -214,7 +214,10 @@ fi
 # Endpoint: GET /api/v1/teams/{id}/members/{username}
 #   200/204 → is member
 #   403     → token owner is not in this team (Gitea 1.22.6 'Must be a team
-#             member' constraint — see follow-up issue for token-provisioning)
+#             member' constraint). The evaluator skips this candidate and
+#             continues to check others. The final failure fires only when
+#             NO candidate has a 200/204 (not when any single one hits 403).
+#             See RFC#324 token-scope follow-up issue for long-term fix.
 #   404     → not a member
 for U in $CANDIDATES; do
   CODE=$(curl -sS -o "$TEAM_PROBE_TMP" -w '%{http_code}' \
@@ -226,12 +229,15 @@ for U in $CANDIDATES; do
       exit 0
       ;;
     403)
-      # Token owner is not in the team being probed; the API refuses to
-      # confirm membership. This is the RFC#324 follow-up token-scope gap.
-      # Fail closed — never grant approval on a 403; surface clearly.
-      echo "::error::team-probe for ${U} in ${TEAM} returned 403 (token owner not in ${TEAM} team — RFC#324 token-scope follow-up). Cannot confirm membership; failing closed."
+      # Token owner is not in the team being probed; Gitea 1.22.6 refuses
+      # to confirm membership in this case. Do NOT hard-fail the gate on a
+      # 403 — doing so would fail the entire gate if ANY candidate triggers
+      # a 403, even when other valid team-members exist. Instead skip this
+      # candidate and continue checking others. If all candidates produce
+      # 403 (token owner can't query any of them) the final exit fires.
+      echo "::warning::team-probe for ${U} in ${TEAM} returned 403 (token owner not in ${TEAM} team — skipping; cannot confirm membership)"
       cat "$TEAM_PROBE_TMP" >&2
-      exit 1
+      continue
       ;;
     404)
       debug "${U} not a member of ${TEAM}"
@@ -243,5 +249,5 @@ for U in $CANDIDATES; do
   esac
 done
 
-echo "::error::${TEAM}-review awaiting non-author APPROVE from ${TEAM} team (candidates: $(echo "$CANDIDATES" | tr '\n' ',' | sed 's/,$//') — none are in team)"
+echo "::error::${TEAM}-review awaiting non-author APPROVE from ${TEAM} team (candidates: $(echo "$CANDIDATES" | tr '\n' ',' | sed 's/,$//') — no valid team-member approval found; check that reviewer is in ${TEAM} team or token owner is a ${TEAM} team member)"
 exit 1

.gitea/scripts/sop-checklist.py

@@ -102,7 +102,7 @@ def normalize_slug(raw: str, numeric_aliases: dict[int, str] | None = None) -> s
 
 
 # ---------------------------------------------------------------------------
-# Comment parsing — /sop-ack and /sop-revoke
+# Comment parsing — /sop-ack, /sop-revoke, and /sop-n/a
 # ---------------------------------------------------------------------------
 
 # A directive must be on its own line. Permits leading whitespace.
@@ -114,23 +114,33 @@ _DIRECTIVE_RE = re.compile(
     re.MULTILINE,
 )
 
+# /sop-n/a <gate> [reason] — declare a qa/sec gate N/A.
+# Gate names: qa-review, security-review (match review-check.sh context names).
+_NA_DIRECTIVE_RE = re.compile(
+    r"^[ \t]*/sop-n/a[ \t]+([A-Za-z0-9_\-]+)(?:[ \t]+(.*))?[ \t]*$",
+    re.MULTILINE,
+)
+
 
 def parse_directives(
     comment_body: str,
     numeric_aliases: dict[int, str],
-) -> tuple[list[tuple[str, str, str]], list]:
-    """Extract /sop-ack and /sop-revoke directives from a comment body.
+) -> tuple[list[tuple[str, str, str]], list[tuple[str, str, str]]]:
+    """Extract /sop-ack, /sop-revoke, and /sop-n/a directives from a comment body.
 
     Returns (directives, na_directives) where:
       directives is a list of (kind, canonical_slug, note) tuples
         kind is "sop-ack" or "sop-revoke"
         canonical_slug is the normalized form (or "" if unparseable)
         note is the trailing free-text (may be "")
-      na_directives is reserved for future N/A handling (always [] for now)
+      na_directives is a list of (gate_name, reason) tuples
+        gate_name is "qa-review" or "security-review" (raw from comment)
+        reason is the free-text after the gate name (may be "")
     """
     out: list[tuple[str, str, str]] = []
+    na_out: list[tuple[str, str, str]] = []
     if not comment_body:
-        return out, []
+        return out, na_out
     for m in _DIRECTIVE_RE.finditer(comment_body):
         kind = m.group(1)
         raw_slug = (m.group(2) or "").strip()
@@ -161,7 +171,11 @@ def parse_directives(
         # If we collapsed multi-word slug into kebab and there's a
         # trailing-text group too, append it.
         out.append((kind, canonical, note_from_group))
-    return out, []
+    for m in _NA_DIRECTIVE_RE.finditer(comment_body):
+        gate_raw = (m.group(1) or "").strip()
+        reason = (m.group(2) or "").strip()
+        na_out.append((gate_raw.lower(), reason))
+    return out, na_out
 
 
 # ---------------------------------------------------------------------------
@@ -304,6 +318,82 @@ def compute_ack_state(
     }
 
 
+def compute_na_state(
+    comments: list[dict[str, Any]],
+    pr_author: str,
+    na_gates: dict[str, dict[str, Any]],
+    team_membership_probe: "callable[[str, list[str]], list[str]]",
+) -> dict[str, dict[str, Any]]:
+    """Compute per-gate N/A declaration state.
+
+    Each comment is processed in chronological order. The most-recent
+    N/A directive per (commenter, gate) wins.
+
+    Returns a dict keyed by gate name:
+       {
+         "qa-review": {
+           "declared": True,
+           "declared_by": "core-qa-agent",
+           "reason": "CI/non-security-touching",
+           "valid": True,   # non-author + in required team
+           "error": None,   # error string if invalid
+         },
+         ...
+       }
+    Undeclared gates have declared=False; invalid gates have declared=True, valid=False.
+    """
+    # Step 1: collapse N/A directives per (commenter, gate) — most recent wins.
+    latest_na: dict[tuple[str, str], tuple[str, str]] = {}
+    for c in comments:
+        body = c.get("body", "") or ""
+        user = (c.get("user") or {}).get("login", "")
+        if not user:
+            continue
+        _, na_directives = parse_directives(body, {})
+        for gate, reason in na_directives:
+            if gate not in na_gates:
+                continue
+            latest_na[(user, gate)] = (gate, reason)
+
+    # Step 2: initialise all gates as undeclared.
+    result: dict[str, dict[str, Any]] = {
+        g: {"declared": False, "declared_by": "", "reason": "", "valid": False, "error": None}
+        for g in na_gates
+    }
+
+    # Step 3: evaluate each gate's most-recent N/A declaration.
+    for (user, gate), (gate_name, reason) in latest_na.items():
+        if gate_name not in na_gates:
+            continue
+        cfg = na_gates[gate_name]
+        required_teams: list[str] = cfg.get("required_teams", [])
+
+        entry: dict[str, Any] = {
+            "declared": True,
+            "declared_by": user,
+            "reason": reason,
+            "valid": False,
+            "error": None,
+        }
+
+        # Authors cannot self-declare N/A (gate script enforces same rule).
+        if user == pr_author:
+            entry["error"] = "self-declare N/A rejected"
+        else:
+            # Probe team membership: is the declarer in any required team?
+            approved = team_membership_probe(f"na:{gate_name}", [user])
+            if user in approved:
+                entry["valid"] = True
+            else:
+                # 403 from team API means token owner not in that team.
+                # Fail-closed: treat unknown membership as invalid.
+                entry["error"] = f"{user} not in required team {required_teams}"
+
+        result[gate_name] = entry
+
+    return result
+
+
 # ---------------------------------------------------------------------------
 # Gitea API client
 # ---------------------------------------------------------------------------
@@ -463,10 +553,29 @@ def _load_config_minimal(path: str) -> dict[str, Any]:
     tier_failure_mode), top-level list of maps (items:), and within an
     item map: scalars + lists of scalars. Does NOT support nested lists,
     YAML anchors, multi-doc, or flow style.
+
+    Key names containing '/' (e.g. n/a_gates) are handled by using
+    rpartition(':') — splitting at the LAST colon so embedded colons
+    in the key are preserved.
     """
     with open(path) as f:
         lines = f.readlines()
-    return _parse_minimal_yaml(lines)
+    # Preprocess: for lines at indent 0 that contain '/' before ':',
+    # use rpartition so the key keeps the '/'. e.g.
+    #   "n/a_gates:"  → key="n/a_gates", val=""
+    #   "n/a_gates: value" → key="n/a_gates", val="value"
+    processed: list[str] = []
+    for raw in lines:
+        stripped = raw.rstrip("\n")
+        indent = len(stripped) - len(stripped.lstrip(" "))
+        content = stripped.lstrip(" ")
+        if indent == 0 and "/" in content and ":" in content:
+            # Use rpartition so the last ':' is the key-value separator.
+            key, _, val = content.rpartition(":")
+            processed.append(" " * indent + key.strip() + ": " + val.strip())
+        else:
+            processed.append(stripped)
+    return _parse_minimal_yaml(processed)
 
 
 def _parse_minimal_yaml(lines: list[str]) -> dict[str, Any]:  # noqa: C901
@@ -803,6 +912,90 @@ def main(argv: list[str] | None = None) -> int:
             extra = " (" + "; ".join(extras) + ")" if extras else ""
             print(f"::notice::  [WAIT] {slug} — no valid peer-ack yet{extra}")
 
+    # ----- N/A gate declarations (RFC#324 §N/A follow-up) -----
+    # sop-checklist.yml fires on /sop-n/a comments; this step posts the
+    # `sop-checklist / na-declarations (pull_request)` status that
+    # review-check.sh reads to waive the Gitea-APPROVE requirement.
+    na_gates: dict[str, Any] = cfg.get("n/a_gates") or {}
+
+    # Build a team-membership probe for N/A gates (separate cache from items probe).
+    na_cache: dict[tuple[str, int], bool | None] = {}
+
+    def na_probe(slug_hint: str, users: list[str]) -> list[str]:
+        # slug_hint is "na:{gate_name}" — extract gate name and required teams.
+        gate_name = slug_hint.removeprefix("na:")
+        gate_cfg = na_gates.get(gate_name, {})
+        team_names: list[str] = gate_cfg.get("required_teams", [])
+        # Resolve team names → ids.
+        team_ids: list[int] = []
+        for tn in team_names:
+            tid = client.resolve_team_id(args.owner, tn)  # noqa: SLF001
+            if tid is None:
+                code, data = client._req(  # noqa: SLF001
+                    "GET", f"/orgs/{args.owner}/teams"
+                )
+                if code == 200 and isinstance(data, list):
+                    for t in data:
+                        if t.get("name") == tn:
+                            tid = t.get("id")
+                            client._team_id_cache[(args.owner, tn)] = tid  # noqa: SLF001
+                            break
+            if tid is not None:
+                team_ids.append(tid)
+        approved: list[str] = []
+        for u in users:
+            for tid in team_ids:
+                ck = (u, tid)
+                if ck not in na_cache:
+                    na_cache[ck] = client.is_team_member(tid, u)  # noqa: SLF001
+                res = na_cache[ck]
+                if res is True:
+                    approved.append(u)
+                    break
+                if res is None:
+                    print(
+                        f"::warning::team-probe for {u} (N/A gate {gate_name}) "
+                        "returned 403 — token owner not in that team; "
+                        "fail-closed for this declaration",
+                        file=sys.stderr,
+                    )
+        return approved
+
+    na_state = compute_na_state(comments, author, na_gates, na_probe)
+    # Build description: list of validly-declared N/A gates.
+    na_approved_gates = [
+        g for g, entry in na_state.items() if entry["valid"]
+    ]
+    na_invalid = [
+        f"{g}({entry['declared_by']})" for g, entry in na_state.items()
+        if entry["declared"] and not entry["valid"]
+    ]
+
+    if na_approved_gates:
+        na_desc = "N/A: " + ", ".join(na_approved_gates)
+    elif na_invalid:
+        na_desc = "invalid N/A: " + ", ".join(na_invalid)
+    else:
+        na_desc = "no N/A declarations"
+    na_state_str = "success" if na_approved_gates else "failure"
+    print(f"::notice::  N/A state: {na_state_str} — {na_desc}")
+    for g, entry in na_state.items():
+        if entry["declared"]:
+            status_flag = "valid" if entry["valid"] else f"invalid: {entry['error']}"
+            print(f"::notice::    {g}: declared by {entry['declared_by']} — {status_flag}")
+
+    target_url = f"https://{args.gitea_host}/{args.owner}/{args.repo}/pulls/{args.pr}"
+
+    if not args.dry_run:
+        na_context = "sop-checklist / na-declarations (pull_request)"
+        client.post_status(
+            args.owner, args.repo, head_sha,
+            state=na_state_str, context=na_context,
+            description=na_desc, target_url=target_url,
+        )
+        print(f"::notice::status posted: {na_context} → {na_state_str}")
+    # ----- end N/A gate declarations -----
+
     print(f"::notice::posting status: state={state} desc={description!r}")
 
     if args.dry_run:
@@ -810,8 +1003,6 @@ def main(argv: list[str] | None = None) -> int:
         if args.exit_on_state:
             return 0 if state in ("success", "pending") else 1
         return 0
-
-    target_url = f"https://{args.gitea_host}/{args.owner}/{args.repo}/pulls/{args.pr}"
     client.post_status(
         args.owner, args.repo, head_sha,
         state=state, context=args.status_context,