def is_encodable(_type, value):
try:
base, sub, arrlist = _type
except ValueError:
base, sub, arrlist = process_type(_type)
if arrlist:
if not is_list_like(value):
return False
if arrlist[-1] and len(value) != arrlist[-1][0]:
return False
sub_type = (base, sub, arrlist[:-1])
return all(is_encodable(sub_type, sub_value) for sub_value in value)
elif base == 'address' and is_ens_name(value):
# ENS names can be used anywhere an address is needed
# Web3.py will resolve the name to an address before encoding it
return True
elif base == 'bytes' and isinstance(value, str):
# Hex-encoded bytes values can be used anywhere a bytes value is needed
if is_hex(value) and len(value) % 2 == 0:
# Require hex-encoding of full bytes (even length)
bytes_val = to_bytes(hexstr=value)
return eth_abi_is_encodable(_type, bytes_val)
else:
return False
elif base == 'string' and isinstance(value, bytes):
# bytes that were encoded with utf-8 can be used anywhere a string is needed
try:
string_val = to_text(value)
except UnicodeDecodeError:
return False
else:
return eth_abi_is_encodable(_type, string_val)
else:
return eth_abi_is_encodable(_type, value)
def is_encodable(_type, value):
if not isinstance(_type, str):
raise ValueError("is_encodable only accepts type strings")
base, sub, arrlist = process_type(_type)
if arrlist:
if not is_list_like(value):
return False
if arrlist[-1] and len(value) != arrlist[-1][0]:
return False
sub_type = (base, sub, arrlist[:-1])
return all(is_encodable(collapse_type(*sub_type), sub_value) for sub_value in value)
elif base == 'address' and is_ens_name(value):
# ENS names can be used anywhere an address is needed
# Web3.py will resolve the name to an address before encoding it
return True
elif base == 'bytes' and isinstance(value, str):
# Hex-encoded bytes values can be used anywhere a bytes value is needed
if is_hex(value) and len(value) % 2 == 0:
# Require hex-encoding of full bytes (even length)
bytes_val = to_bytes(hexstr=value)
return eth_abi_is_encodable(_type, bytes_val)
else:
return False
elif base == 'string' and isinstance(value, bytes):
# bytes that were encoded with utf-8 can be used anywhere a string is needed
try:
string_val = to_text(value)
except UnicodeDecodeError:
return False
else:
return eth_abi_is_encodable(_type, string_val)
else:
return eth_abi_is_encodable(_type, value)