Initial commit

funga/eth/web3ext/__init__.py

@@ -0,0 +1,29 @@
+import logging
+import re
+
+from web3 import Web3 as Web3super
+from web3 import WebsocketProvider, HTTPProvider
+from .middleware import PlatformMiddleware
+
+re_websocket = re.compile('^wss?://')
+re_http = re.compile('^https?://')
+
+logg = logging.getLogger(__file__)
+
+
+def create_middleware(ipcpath):
+    PlatformMiddleware.ipcaddr = ipcpath
+    return PlatformMiddleware
+
+
+# overrides the original Web3 constructor
+#def Web3(blockchain_provider='ws://localhost:8546', ipcpath=None):
+def Web3(provider, ipcpath=None):
+    w3 = Web3super(provider)
+
+    if ipcpath != None:
+        logg.info('using signer middleware with ipc {}'.format(ipcpath))
+        w3.middleware_onion.add(create_middleware(ipcpath))
+
+    w3.eth.personal = w3.geth.personal
+    return w3

funga/eth/web3ext/middleware.py

@@ -0,0 +1,116 @@
+# 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