def validate_subasset_longname(subasset_longname, subasset_child=None):
if subasset_child is None:
chunks = subasset_longname.split('.', 1)
if (len(chunks) == 2):
subasset_child = chunks[1]
else:
subasset_child = ''
if len(subasset_child) < 1:
raise exceptions.AssetNameError('subasset name too short')
if len(subasset_longname) > 250:
raise exceptions.AssetNameError('subasset name too long')
# can't start with period, can't have consecutive periods, can't contain anything not in SUBASSET_DIGITS
previous_digit = '.'
for c in subasset_child:
if c not in SUBASSET_DIGITS:
raise exceptions.AssetNameError(
'subasset name contains invalid character:', c)
if c == '.' and previous_digit == '.':
raise exceptions.AssetNameError(
'subasset name contains consecutive periods')
previous_digit = c
if previous_digit == '.':
raise exceptions.AssetNameError('subasset name ends with a period')
return True
def generate_asset_id(asset_name, block_index):
"""Create asset_id from asset_name."""
if asset_name == config.BTC: return 0
elif asset_name == config.XCP: return 1
if len(asset_name) < 4:
raise exceptions.AssetNameError('too short')
# Numeric asset names.
if enabled('numeric_asset_names'): # Protocol change.
if asset_name[0] == 'A':
# Must be numeric.
try:
asset_id = int(asset_name[1:])
except ValueError:
raise exceptions.AssetNameError(
'non‐numeric asset name starts with ‘A’')
# Number must be in range.
if not (26**12 + 1 <= asset_id <= 2**64 - 1):
raise exceptions.AssetNameError(
'numeric asset name not in range')
return asset_id
elif len(asset_name) >= 13:
raise exceptions.AssetNameError('long asset names must be numeric')
if asset_name[0] == 'A':
raise exceptions.AssetNameError(
'non‐numeric asset name starts with ‘A’')
# Convert the Base 26 string to an integer.
n = 0
for c in asset_name:
n *= 26
if c not in B26_DIGITS:
raise exceptions.AssetNameError('invalid character:', c)
digit = B26_DIGITS.index(c)
n += digit
asset_id = n
if asset_id < 26**3:
raise exceptions.AssetNameError('too short')
return asset_id
def validate_subasset_parent_name(asset_name):
if asset_name == config.BTC:
raise exceptions.AssetNameError('parent asset cannot be {}'.format(config.BTC))
if asset_name == config.XCP:
raise exceptions.AssetNameError('parent asset cannot be {}'.format(config.XCP))
if len(asset_name) < 4:
raise exceptions.AssetNameError('parent asset name too short')
if len(asset_name) >= 13:
raise exceptions.AssetNameError('parent asset name too long')
if asset_name[0] == 'A':
raise exceptions.AssetNameError('parent asset name starts with ‘A’')
for c in asset_name:
if c not in B26_DIGITS:
raise exceptions.AssetNameError('parent asset name contains invalid character:', c)
return True
def unpack(db, message, block_index):
try:
# account for memo bytes
memo_bytes_length = len(message) - LENGTH
if memo_bytes_length < 0:
raise exceptions.UnpackError('invalid message length')
if memo_bytes_length > MAX_MEMO_LENGTH:
raise exceptions.UnpackError('memo too long')
struct_format = FORMAT + ('{}s'.format(memo_bytes_length))
asset_id, quantity, short_address_bytes, memo_bytes = struct.unpack(
struct_format, message)
if len(memo_bytes) == 0:
memo_bytes = None
# unpack address
full_address = address.unpack(short_address_bytes)
# asset id to name
asset = util.generate_asset_name(asset_id, block_index)
if asset == config.BTC:
raise exceptions.AssetNameError('{} not allowed'.format(
config.BTC))
except (struct.error) as e:
logger.warning("enhanced send unpack error: {}".format(e))
raise exceptions.UnpackError('could not unpack')
except (exceptions.AssetNameError, exceptions.AssetIDError) as e:
logger.warning("enhanced send invalid asset id: {}".format(e))
raise exceptions.UnpackError('asset id invalid')
unpacked = {
'asset': asset,
'quantity': quantity,
'address': full_address,
'memo': memo_bytes,
}
return unpacked
