#!/usr/bin/env bash
# Scenario B: decrypt a transit blob produced by secret-encrypt.sh.
#   secret-decrypt.sh <encfile> [outfile]   (default outfile: <encfile> w/o .vaultenc, +.dec)
set -euo pipefail
ADDR="${BAO_ADDR:-http://127.0.0.1:8200}"
TOKF="$HOME/.config/openbao/personal-transit.token"
KEY="personal-backup"
in="${1:?usage: secret-decrypt.sh <encfile> [outfile]}"
out="${2:-${in%.vaultenc}.dec}"
[ -r "$TOKF" ] || { echo "no token at $TOKF" >&2; exit 1; }
[ -r "$in" ]   || { echo "no input file: $in" >&2; exit 1; }

b64="$(cat "$in" \
  | python3 -c 'import json,sys;print(json.dumps({"ciphertext":sys.stdin.read().strip()}))' \
  | curl -sS -H "X-Vault-Token: $(cat "$TOKF")" --data @- "$ADDR/v1/transit-personal/decrypt/$KEY" \
  | jq -r '.data.plaintext // empty')"
[ -n "$b64" ] || { echo "decrypt failed (wrong key/blob?)" >&2; exit 1; }
printf '%s' "$b64" | base64 -d > "$out"
echo "decrypted $in -> $out"