import argparse
import http.server
import json
import os
import ssl


class Handler(http.server.BaseHTTPRequestHandler):
    protocol_version = 'HTTP/1.1'

    def do_POST(self):
        length = int(self.headers.get('Content-Length', '0'))
        if length < 0 or length > 1024 * 1024:
            self.send_error(413)
            return
        self.rfile.read(length)
        self.send_response(204)
        self.send_header('Content-Length', '0')
        self.send_header('Retry-After', '1')
        self.end_headers()

    def log_message(self, _format, *_args):
        pass


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('--cert', required=True)
    parser.add_argument('--key', required=True)
    parser.add_argument('--port', required=True, type=int)
    parser.add_argument('--ready-file', required=True)
    args = parser.parse_args()

    server = http.server.ThreadingHTTPServer(('127.0.0.1', args.port), Handler)
    context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
    context.load_cert_chain(args.cert, args.key)
    server.socket = context.wrap_socket(server.socket, server_side=True)
    with open(args.ready_file, 'x', encoding='ascii') as handle:
        json.dump({'port': server.server_port}, handle, separators=(',', ':'))
        handle.write('\n')
    os.chmod(args.ready_file, 0o600)
    server.serve_forever()


if __name__ == '__main__':
    main()