# standard imports
import logging

# external imports
from chainlib.eth.address import to_checksum_address
from hexathon import strip_0x

# local imports
from gas3.error import InvalidInput
from gas3.error import Used
from gas3.base import check

logg = logging.getLogger(__name__)


def register_address(a):
    pass

def do_register(req, env, data_dir):
    i = req.path.find('/', 1)
    if i == -1:
        raise InvalidInput(env.path)
    p = req.path[i+1:]
    r = None
    r = check(p, data_dir)
    if not r:
        raise Used('already used: ' + p)
   
    v = env['wsgi.input'].read(42)
    if type(v) == bytes:
        v = v.decode('utf-8')
    try:
        v = strip_0x(v)
        v = to_checksum_address(v)
    except:
        raise InvalidInput('invalid address: ' + str(v))

    data_dir.add(p, bytes.fromhex(v))
    return v