#!/bin/sh
# Master-Link API - ZKP Challenge Generation
# GET /api/master-link/zkp-challenge
# Returns: challenge_id and timestamp for ZKP authentication

echo "Content-Type: application/json"
echo "Access-Control-Allow-Origin: *"
echo "Access-Control-Allow-Methods: GET, OPTIONS"
echo "Access-Control-Allow-Headers: Content-Type"
echo ""

# Handle CORS preflight
if [ "$REQUEST_METHOD" = "OPTIONS" ]; then
	exit 0
fi

# Load library
. /usr/lib/secubox/master-link.sh >/dev/null 2>&1

# Check if ZKP is enabled
zkp_enabled=$(uci -q get master-link.main.zkp_enabled)
if [ "$zkp_enabled" != "1" ]; then
	echo '{"error":"zkp_disabled"}'
	exit 0
fi

# Generate challenge
ml_zkp_challenge