cic-eth: Introduce transfer authorization contract

apps/cic-eth/cic_eth/runnable/daemons/filters/__init__.py

@@ -2,3 +2,4 @@ from .callback import CallbackFilter
 from .tx import TxFilter
 from .gas import GasFilter
 from .register import RegistrationFilter
+from .transferauth import TransferAuthFilter

apps/cic-eth/cic_eth/runnable/daemons/filters/gas.py

@@ -1,7 +1,7 @@
 # standard imports
 import logging
 
-# third-party imports
+# external imports
 from cic_registry.chain import ChainSpec
 from hexathon import add_0x
 
@@ -24,7 +24,7 @@ class GasFilter(SyncFilter):
         self.chain_spec = chain_spec
 
 
-    def filter(self, conn, block, tx, session): #rcpt, chain_str, session=None):
+    def filter(self, conn, block, tx, session):
         tx_hash_hex = add_0x(tx.hash)
         if tx.value > 0:
             logg.debug('gas refill tx {}'.format(tx_hash_hex))

apps/cic-eth/cic_eth/runnable/daemons/filters/transferauth.py

@@ -0,0 +1,89 @@
+# standard imports
+import logging
+
+# external imports
+import celery
+from hexathon import (
+        strip_0x,
+        add_0x,
+        )
+from chainlib.eth.address import to_checksum
+from .base import SyncFilter
+
+
+logg = logging.getLogger(__name__)
+
+transfer_request_signature = 'ed71262a'
+
+def unpack_create_request(data):
+
+    data = strip_0x(data)
+    cursor = 0
+    f = data[cursor:cursor+8]
+    cursor += 8
+
+    if f != transfer_request_signature:
+        raise ValueError('Invalid create request data ({})'.format(f))
+
+    o = {}
+    o['sender'] = data[cursor+24:cursor+64]
+    cursor += 64
+    o['recipient'] = data[cursor+24:cursor+64]
+    cursor += 64
+    o['token'] = data[cursor+24:cursor+64]
+    cursor += 64
+    o['value'] = int(data[cursor:], 16)
+    return o
+
+
+class TransferAuthFilter(SyncFilter):
+
+    def __init__(self, registry, chain_spec, queue=None):
+        self.queue = queue
+        self.chain_spec = chain_spec
+        self.transfer_request_contract = registry.get_contract(self.chain_spec, 'TransferAuthorization')
+
+
+    def filter(self, conn, block, tx, session): #rcpt, chain_str, session=None):
+
+        if tx.payload == None:
+            logg.debug('no payload')
+            return False
+
+        payloadlength = len(tx.payload)
+        if payloadlength != 8+256:
+            logg.debug('{} below minimum length for a transfer auth call'.format(payloadlength))
+            logg.debug('payload {}'.format(tx.payload))
+            return False
+
+        recipient = tx.inputs[0]
+        if recipient != self.transfer_request_contract.address():
+            logg.debug('not our transfer auth contract address {}'.format(recipient))
+            return False
+
+        o = unpack_create_request(tx.payload) 
+           
+        sender = add_0x(to_checksum(o['sender']))
+        recipient = add_0x(to_checksum(recipient))
+        token = add_0x(to_checksum(o['token']))
+        s = celery.signature(
+            'cic_eth.eth.token.approve',
+            [
+                [
+                    {
+                        'address': token,
+                        },
+                    ],
+                sender,
+                recipient,
+                o['value'],
+                str(self.chain_spec),
+                ],
+            queue=self.queue,
+            )
+        t = s.apply_async()
+        return True
+
+
+    def __str__(self):
+        return 'cic-eth transfer auth filter'

apps/cic-eth/cic_eth/runnable/daemons/server.py

@@ -0,0 +1,136 @@
+# standard imports
+import os
+import re
+import logging
+import argparse
+import json
+
+# third-party imports
+import web3
+import confini
+import celery
+from json.decoder import JSONDecodeError
+from cic_registry.chain import ChainSpec
+
+# local imports
+from cic_eth.db import dsn_from_config
+from cic_eth.db.models.base import SessionBase
+from cic_eth.eth.util import unpack_signed_raw_tx
+
+logging.basicConfig(level=logging.WARNING)
+logg = logging.getLogger()
+
+rootdir = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
+dbdir = os.path.join(rootdir, 'cic_eth', 'db')
+migrationsdir = os.path.join(dbdir, 'migrations')
+
+config_dir = os.path.join('/usr/local/etc/cic-eth')
+
+argparser = argparse.ArgumentParser()
+argparser.add_argument('-c', type=str, default=config_dir, help='config file')
+argparser.add_argument('-i', '--chain-spec', dest='i', type=str, help='chain spec')
+argparser.add_argument('--env-prefix', default=os.environ.get('CONFINI_ENV_PREFIX'), dest='env_prefix', type=str, help='environment prefix for variables to overwrite configuration')
+argparser.add_argument('-q', type=str, default='cic-eth', help='queue name for worker tasks')
+argparser.add_argument('-v', action='store_true', help='be verbose')
+argparser.add_argument('-vv', action='store_true', help='be more verbose')
+args = argparser.parse_args()
+
+if args.vv:
+    logging.getLogger().setLevel(logging.DEBUG)
+elif args.v:
+    logging.getLogger().setLevel(logging.INFO)
+
+config = confini.Config(args.c, args.env_prefix)
+config.process()
+args_override = {
+        'CIC_CHAIN_SPEC': getattr(args, 'i'),
+        }
+config.censor('PASSWORD', 'DATABASE')
+config.censor('PASSWORD', 'SSL')
+logg.debug('config:\n{}'.format(config))
+
+dsn = dsn_from_config(config)
+SessionBase.connect(dsn)
+
+celery_app = celery.Celery(backend=config.get('CELERY_RESULT_URL'),  broker=config.get('CELERY_BROKER_URL'))
+queue = args.q
+
+re_something = r'^/something/?'
+
+chain_spec = ChainSpec.from_chain_str(config.get('CIC_CHAIN_SPEC'))
+
+
+def process_something(session, env):
+    r = re.match(re_something, env.get('PATH_INFO'))
+    if not r:
+        return None
+
+    #if env.get('CONTENT_TYPE') != 'application/json':
+    #    raise AttributeError('content type')
+
+    #if env.get('REQUEST_METHOD') != 'POST':
+    #    raise AttributeError('method')
+
+    #post_data = json.load(env.get('wsgi.input'))
+    
+    #return ('text/plain', 'foo'.encode('utf-8'),)
+
+
+# uwsgi application
+def application(env, start_response):
+    
+    for k in env.keys():
+        logg.debug('env {} {}'.format(k, env[k]))
+
+    headers = []
+    content = b''
+    err = None
+
+    session = SessionBase.create_session()
+    for handler in [
+            process_something,
+            ]:
+        try:
+            r = handler(session, env)
+        except AttributeError as e:
+            logg.error('handler fail attribute {}'.format(e))
+            err = '400 Impertinent request'
+            break
+        except JSONDecodeError as e:
+            logg.error('handler fail json {}'.format(e))
+            err = '400 Invalid data format'
+            break
+        except KeyError as e:
+            logg.error('handler fail key {}'.format(e))
+            err = '400 Invalid JSON'
+            break
+        except ValueError as e:
+            logg.error('handler fail value {}'.format(e))
+            err = '400 Invalid data'
+            break
+        except RuntimeError as e:
+            logg.error('task fail value {}'.format(e))
+            err = '500 Task failed, sorry I cannot tell you more'
+            break
+        if r != None:
+            (mime_type, content) = r
+            break
+    session.close()
+
+    if err != None:
+        headers.append(('Content-Type', 'text/plain, charset=UTF-8',))
+        start_response(err, headers)
+        session.close()
+        return [content]
+
+    headers.append(('Content-Length', str(len(content))),)
+    headers.append(('Access-Control-Allow-Origin', '*',));
+
+    if len(content) == 0:
+        headers.append(('Content-Type', 'text/plain, charset=UTF-8',))
+        start_response('404 Looked everywhere, sorry', headers)
+    else:
+        headers.append(('Content-Type', mime_type,))
+        start_response('200 OK', headers)
+
+    return [content]

apps/cic-eth/cic_eth/runnable/daemons/tasker.py

@@ -26,7 +26,6 @@ from cic_eth.eth import bancor
 from cic_eth.eth import token
 from cic_eth.eth import tx
 from cic_eth.eth import account
-from cic_eth.eth import request
 from cic_eth.admin import debug
 from cic_eth.admin import ctrl
 from cic_eth.eth.rpc import RpcClient
@@ -40,6 +39,7 @@ from cic_eth.callbacks import redis
 from cic_eth.db.models.base import SessionBase
 from cic_eth.db.models.otx import Otx
 from cic_eth.db import dsn_from_config
+from cic_eth.ext import tx
 
 logging.basicConfig(level=logging.WARNING)
 logg = logging.getLogger()

apps/cic-eth/cic_eth/runnable/daemons/tracker.py

@@ -58,6 +58,7 @@ from cic_eth.runnable.daemons.filters import (
         GasFilter,
         TxFilter,
         RegistrationFilter,
+        TransferAuthFilter,
         )
 
 script_dir = os.path.realpath(os.path.dirname(__file__))
@@ -146,6 +147,8 @@ def main():
 
     gas_filter = GasFilter(chain_spec, config.get('_CELERY_QUEUE'))
 
+    transfer_auth_filter = TransferAuthFilter(registry, chain_spec, config.get('_CELERY_QUEUE'))
+
     i = 0
     for syncer in syncers:
         logg.debug('running syncer index {}'.format(i))
@@ -153,6 +156,7 @@ def main():
         syncer.add_filter(registration_filter)
         # TODO: the two following filter functions break the filter loop if return uuid. Pro: less code executed. Con: Possibly unintuitive flow break
         syncer.add_filter(tx_filter)
+        syncer.add_filter(transfer_auth_filter)
         for cf in callback_filters:
             syncer.add_filter(cf)