funga/crypto_dev_signer/eth/web3ext/middleware.py

117 lines
3.9 KiB
Python
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

# standard imports
import logging
import re
import socket
import uuid
import json
logg = logging.getLogger(__file__)
def jsonrpc_request(method, params):
uu = uuid.uuid4()
return {
"jsonrpc": "2.0",
"id": str(uu),
"method": method,
"params": params,
}
class PlatformMiddleware:
# id for the request is not available, meaning we cannot easily short-circuit
# hack workaround
id_seq = -1
re_personal = re.compile('^personal_.*')
ipcaddr = None
def __init__(self, make_request, w3):
self.w3 = w3
self.make_request = make_request
if self.ipcaddr == None:
raise AttributeError('ipcaddr not set')
# TODO: understand what format input params come in
# single entry input gives a tuple on params, wtf...
# dict input comes as [{}] and fails if not passed on as an array
@staticmethod
def _translate_params(params):
#if params.__class__.__name__ == 'tuple':
# r = []
# for p in params:
# r.append(p)
# return r
if params.__class__.__name__ == 'list' and len(params) > 0:
return params[0]
return params
# TODO: DRY
def __call__(self, method, suspect_params):
self.id_seq += 1
logg.debug('in middleware method {} params {} ipcpath {}'.format(method, suspect_params, self.ipcaddr))
if self.re_personal.match(method) != None:
params = PlatformMiddleware._translate_params(suspect_params)
# multiple providers is removed in web3.py 5.12.0
# https://github.com/ethereum/web3.py/issues/1701
# thus we need a workaround to use the same web3 instance
s = socket.socket(family=socket.AF_UNIX, type=socket.SOCK_STREAM, proto=0)
ipc_provider_workaround = s.connect(self.ipcaddr)
logg.info('redirecting method {} params {} original params {}'.format(method, params, suspect_params))
o = jsonrpc_request(method, params[0])
j = json.dumps(o)
logg.debug('send {}'.format(j))
s.send(j.encode('utf-8'))
r = s.recv(4096)
s.close()
logg.debug('got recv {}'.format(str(r)))
jr = json.loads(r)
jr['id'] = self.id_seq
#return str(json.dumps(jr))
return jr
elif method == 'eth_signTransaction':
params = PlatformMiddleware._translate_params(suspect_params)
s = socket.socket(family=socket.AF_UNIX, type=socket.SOCK_STREAM, proto=0)
ipc_provider_workaround = s.connect(self.ipcaddr)
logg.info('redirecting method {} params {} original params {}'.format(method, params, suspect_params))
o = jsonrpc_request(method, params[0])
j = json.dumps(o)
logg.debug('send {}'.format(j))
s.send(j.encode('utf-8'))
r = s.recv(4096)
s.close()
logg.debug('got recv {}'.format(str(r)))
jr = json.loads(r)
jr['id'] = self.id_seq
#return str(json.dumps(jr))
return jr
elif method == 'eth_sign':
params = PlatformMiddleware._translate_params(suspect_params)
s = socket.socket(family=socket.AF_UNIX, type=socket.SOCK_STREAM, proto=0)
ipc_provider_workaround = s.connect(self.ipcaddr)
logg.info('redirecting method {} params {} original params {}'.format(method, params, suspect_params))
o = jsonrpc_request(method, params)
j = json.dumps(o)
logg.debug('send {}'.format(j))
s.send(j.encode('utf-8'))
r = s.recv(4096)
s.close()
logg.debug('got recv {}'.format(str(r)))
jr = json.loads(r)
jr['id'] = self.id_seq
return jr
r = self.make_request(method, suspect_params)
return r