bemaniutils/bemani/client/protocol.py

import requests

from bemani.client.common import random_hex_string
from bemani.protocol import EAmuseProtocol, Node


class ClientProtocol:
    def __init__(self, address: str, port: int, encryption: bool, compression: bool, verbose: bool) -> None:
        self.__address = address
        self.__port = port
        self.__encryption = encryption
        self.__compression = compression
        self.__verbose = verbose

    def exchange(self, uri: str, tree: Node, text_encoding: str="shift-jis", packet_encoding: str="binary") -> Node:
        headers = {}

        if self.__verbose:
            print('Outgoing request:')
            print(tree)

        # Handle encoding
        if packet_encoding == "xml":
            _packet_encoding = EAmuseProtocol.XML
        elif packet_encoding == "binary":
            _packet_encoding = EAmuseProtocol.BINARY
        else:
            raise Exception(f"Unknown packet encoding {packet_encoding}")

        # Handle encryption
        if self.__encryption:
            encryption = f'1-{random_hex_string(8)}-{random_hex_string(4)}'
            headers['X-Eamuse-Info'] = encryption
        else:
            encryption = None

        # Handle compression
        if self.__compression:
            compression = 'lz77'
        else:
            compression = None
        headers['X-Compress'] = compression

        # Convert it
        proto = EAmuseProtocol()
        req = proto.encode(
            compression,
            encryption,
            tree,
            text_encoding=text_encoding,
            packet_encoding=_packet_encoding,
        )

        # Send the request, get the response
        r = requests.post(
            f'http://{self.__address}:{self.__port}/{uri}',
            headers=headers,
            data=req,
        )

        # Get the compression and encryption
        encryption = headers.get('X-Eamuse-Info')
        compression = headers.get('X-Compress')

        # Decode it
        packet = proto.decode(
            compression,
            encryption,
            r.content,
        )
        if self.__verbose:
            print('Incoming response:')
            print(packet)
        return packet