MRZ API

#!/usr/bin/env bash
set -euo pipefail
: "${MRZ_BASE_URL:?Set MRZ_BASE_URL}"
: "${MRZ_API_KEY:?Set MRZ_API_KEY}"
timeout="${MRZ_TIMEOUT_SECONDS:-95}"
if ! python3 -c 'import math, sys; n = float(sys.argv[1]); assert math.isfinite(n) and n > 0' "$timeout" 2>/dev/null; then
  printf '%s\n' 'Set a positive MRZ_TIMEOUT_SECONDS.' >&2
  exit 1
fi

# Keep the request and response in memory, not in temporary document files.
if ! wire="$(python3 -c '
import base64, json
from pathlib import Path
print(json.dumps({"image_base64": base64.b64encode(Path("document.jpg").read_bytes()).decode("ascii")}))
' 2>/dev/null | curl --disable --silent \
  --max-time "$timeout" --proto '=http,https' \
  --request POST "${MRZ_BASE_URL%/}/v1/mrz?include_crop=false" \
  --header "Authorization: Bearer ${MRZ_API_KEY}" \
  --header 'Content-Type: application/json' --header 'Accept: application/json' \
  --data-binary @- --write-out '\n%{http_code}')"; then
  printf '%s\n' 'MRZ request failed.' >&2
  exit 1
fi
status="${wire##*$'\n'}"
body="${wire%$'\n'*}"
case "$status" in
  2??) ;;
  *) printf 'MRZ HTTP %s.\n' "$status" >&2; exit 1 ;;
esac
printf '%s' "$body" | python3 -c '
import json, sys
try:
    result = json.load(sys.stdin, parse_constant=lambda _: (_ for _ in ()).throw(ValueError()))
except (ValueError, UnicodeError):
    sys.exit("Invalid JSON response.")
# Use result in your application; do not print document data.
print("MRZ response received.")
'