#!/usr/bin/env bash
set -uo pipefail

# CASAN Plan-16 SEC-26 (X-01) — stored / second-order injection scan.
#
# "Trusted" data that later flows INTO a prompt — golden-runs, red-team corpus,
# traceability map, requirement docs — was never H4-scanned, because the gate only
# scanned DIRECT input. A payload planted in such a file becomes a stored injection
# the moment that file is loaded into the model context on a later step (the
# stored-XSS analog). This scans every such source with the SAME H4 layer
# (artifact-scan.sh → security-check.sh input mode) BEFORE it may enter a prompt,
# and BLOCKS on any hit. Fail-closed: a required source that is missing/unreadable,
# or any scan error, is treated as BLOCK (not silently skipped).
#
# Usage: stored-content-scan.sh <path> [<path> ...]
#   <path> = file or directory (directories scanned recursively; text files only).
# Exit: 0 all clean · 2 injection detected OR a required source missing/unreadable · 64 usage.

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
ARTIFACT_SCAN="$SCRIPT_DIR/artifact-scan.sh"
[[ "$#" -ge 1 ]] || { echo "Usage: stored-content-scan.sh <path> [<path> ...]" >&2; exit 64; }

TS="$(date -u +"%Y-%m-%dT%H:%M:%SZ")"
scanned=0; blocked=0; missing=0

scan_file() {
  local f="$1"
  scanned=$((scanned + 1))
  if ! bash "$ARTIFACT_SCAN" "$f" "stored:$f" >/dev/null 2>&1; then
    echo "STORED_SCAN_BLOCKED file=$f reason=injection_or_scan_error timestamp=$TS" >&2
    blocked=$((blocked + 1))
  fi
}

for p in "$@"; do
  if [[ -f "$p" ]]; then
    scan_file "$p"
  elif [[ -d "$p" ]]; then
    # Recurse; scan text files only (grep -I skips binaries), ignore VCS metadata.
    while IFS= read -r -d '' f; do
      grep -Iq . "$f" 2>/dev/null && scan_file "$f"
    done < <(find "$p" -type f -not -path '*/.git/*' -print0 2>/dev/null)
  else
    echo "STORED_SCAN_MISSING path=$p (required source absent/unreadable) timestamp=$TS" >&2
    missing=$((missing + 1))
  fi
done

if [[ "$blocked" -gt 0 || "$missing" -gt 0 ]]; then
  echo "STORED_SCAN_RESULT scanned=$scanned blocked=$blocked missing=$missing verdict=BLOCK timestamp=$TS" >&2
  exit 2
fi
echo "STORED_SCAN_RESULT scanned=$scanned blocked=0 missing=0 verdict=CLEAN timestamp=$TS"
exit 0