Onionr/src/onionrblocks/blockmetadata/fromdata.py

"""Onionr - Private P2P Communication.

    Return a useful tuple of (metadata (header), meta, and data) by accepting raw block data
"""
from json import JSONDecodeError
import ujson as json

from onionrutils import bytesconverter
import logger
"""
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
"""


def get_block_metadata_from_data(block_data):
    """
        accepts block contents as string, returns a tuple of
        metadata, meta (meta being internal metadata, which will be
        returned as an encrypted base64 string if it is encrypted, dict if not).
    """
    meta = {}
    metadata = {}
    data = block_data
    try:
        block_data = block_data.encode()
    except AttributeError:
        pass

    try:
        metadata = json.loads(bytesconverter.bytes_to_str(block_data[:block_data.find(b'\n')]))
    except JSONDecodeError:
        pass
    except ValueError:
        logger.warn("Could not get metadata from:", terminal=True)
        logger.warn(block_data, terminal=True)
    else:
        data = block_data[block_data.find(b'\n'):]

        meta = metadata['meta']
    return (metadata, meta, data)