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moderation.py
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import base64
import json
import nacl.signing
import os
import time
from binascii import unhexlify
from collections import OrderedDict
from config import DATA_FOLDER
from copy import deepcopy
from dht.utils import digest
from keys.keychain import KeyChain
from market.contracts import Contract
from protos.objects import PlaintextMessage
def process_dispute(contract, db, message_listener, notification_listener, testnet):
"""
This function processes a dispute message received from another node. It checks the
contract to see if this a dispute for a purchase we made, a dispute for one of our
sales, or a new case if we are the moderator.
If it's a purchase or sale it will
update the order status to disputed and push a notification to the listener.
If it's a new case it will validate the contract, create a new case in the db,
and push a notification to the listener.
Args:
contract: a json contract of the current order state. Should have a "dispute"
object attached with dispute info.
db: a `Database` object.
message_listener: a `MessageListenerImpl` object.
notification_listener: a `NotificationListenerImpl` object.
testnet: `bool` of whether we're on testnet or not.
"""
tmp_contract = deepcopy(contract)
if "vendor_order_confirmation" in tmp_contract:
del tmp_contract["vendor_order_confirmation"]
if "buyer_receipt" in tmp_contract:
del tmp_contract["buyer_receipt"]
del tmp_contract["dispute"]
order_id = digest(json.dumps(tmp_contract, indent=4)).encode("hex")
own_guid = KeyChain(db).guid.encode("hex")
if contract["dispute"]["info"]["guid"] == contract["vendor_offer"]["listing"]["id"]["guid"]:
guid = unhexlify(contract["vendor_offer"]["listing"]["id"]["guid"])
public_key = unhexlify(contract["vendor_offer"]["listing"]["id"]["pubkeys"]["guid"])
if "blockchain_id" in contract["vendor_offer"]["listing"]["id"]:
handle = contract["vendor_offer"]["listing"]["id"]["blockchain_id"]
else:
handle = ""
proof_sig = None
elif contract["dispute"]["info"]["guid"] == contract["buyer_order"]["order"]["id"]["guid"]:
guid = unhexlify(contract["buyer_order"]["order"]["id"]["guid"])
public_key = unhexlify(contract["buyer_order"]["order"]["id"]["pubkeys"]["guid"])
if "blockchain_id" in contract["buyer_order"]["order"]["id"]:
handle = contract["buyer_order"]["order"]["id"]["blockchain_id"]
else:
handle = ""
proof_sig = contract["dispute"]["info"]["proof_sig"]
else:
raise Exception("Dispute guid not in contract")
verify_key = nacl.signing.VerifyKey(public_key)
verify_key.verify(json.dumps(contract["dispute"]["info"], indent=4),
base64.b64decode(contract["dispute"]["signature"]))
p = PlaintextMessage()
p.sender_guid = guid
p.handle = handle
p.pubkey = public_key
p.subject = str(order_id)
p.type = PlaintextMessage.Type.Value("DISPUTE_OPEN")
p.message = str(contract["dispute"]["info"]["claim"])
p.timestamp = int(time.time())
p.avatar_hash = unhexlify(str(contract["dispute"]["info"]["avatar_hash"]))
if db.purchases.get_purchase(order_id) is not None:
db.purchases.update_status(order_id, 4)
elif db.sales.get_sale(order_id) is not None:
db.sales.update_status(order_id, 4)
elif "moderators" in contract["vendor_offer"]["listing"]:
# TODO: make sure a case isn't already open in the db
is_selected = False
for moderator in contract["vendor_offer"]["listing"]["moderators"]:
if moderator["guid"] == own_guid and contract["buyer_order"]["order"]["moderator"] == own_guid:
is_selected = True
if not is_selected:
raise Exception("Not a moderator for this contract")
else:
if "blockchain_id" in contract["vendor_offer"]["listing"]["id"] and \
contract["vendor_offer"]["listing"]["id"]["blockchain_id"] != "":
vendor = contract["vendor_offer"]["listing"]["id"]["blockchain_id"]
else:
vendor = contract["vendor_offer"]["listing"]["id"]["guid"]
if "blockchain_id" in contract["buyer_order"]["order"]["id"] and \
contract["buyer_order"]["order"]["id"]["blockchain_id"] != "":
buyer = contract["buyer_order"]["order"]["id"]["blockchain_id"]
else:
buyer = contract["buyer_order"]["order"]["id"]["guid"]
c = Contract(db, contract=contract, testnet=testnet)
validation_failures = c.validate_for_moderation(proof_sig)
db.cases.new_case(order_id,
contract["vendor_offer"]["listing"]["item"]["title"],
time.time(),
contract["buyer_order"]["order"]["date"],
float(contract["buyer_order"]["order"]["payment"]["amount"]),
contract["vendor_offer"]["listing"]["item"]["image_hashes"][0],
buyer, vendor, json.dumps(validation_failures),
contract["dispute"]["info"]["claim"])
with open(os.path.join(DATA_FOLDER, "cases", order_id + ".json"), 'wb') as outfile:
outfile.write(json.dumps(contract, indent=4))
else:
raise Exception("Order ID for dispute not found")
message_listener.notify(p, "")
notification_listener.notify(guid, handle, "dispute_open", order_id,
contract["vendor_offer"]["listing"]["item"]["title"],
unhexlify(contract["vendor_offer"]["listing"]["item"]["image_hashes"][0]))
def close_dispute(resolution_json, db, message_listener, notification_listener, testnet):
"""
This function processes a dispute close message received from the moderator. It will
store the resolution in the contract and send a notification to the listeners telling
them that the dispute is resolved.
Args:
resolution_json: The `dispute_resolution` portion of the contract received from the moderator.
db: a `Database` object.
message_listener: a `MessageListenerImpl` object.
notification_listener: a `NotificationListenerImpl` object.
testnet: `bool` of whether we're on testnet or not.
"""
order_id = resolution_json["dispute_resolution"]["resolution"]["order_id"]
if os.path.exists(os.path.join(DATA_FOLDER, "purchases", "in progress", order_id + ".json")):
file_path = os.path.join(DATA_FOLDER, "purchases", "in progress", order_id + ".json")
elif os.path.exists(os.path.join(DATA_FOLDER, "store", "contracts", "in progress", order_id + ".json")):
file_path = os.path.join(DATA_FOLDER, "store", "contracts", "in progress", order_id + ".json")
with open(file_path, 'r') as filename:
contract = json.load(filename, object_pairs_hook=OrderedDict)
for moderator in contract["vendor_offer"]["listing"]["moderators"]:
if moderator["guid"] == contract["buyer_order"]["order"]["moderator"]:
moderator_guid = unhexlify(moderator["guid"])
moderator_handle = moderator["blockchain_id"]
moderator_pubkey = unhexlify(moderator["pubkeys"]["guid"])
moderator_avatar = unhexlify(moderator["avatar"])
verify_key = nacl.signing.VerifyKey(moderator_pubkey)
verify_key.verify(json.dumps(resolution_json["dispute_resolution"]["resolution"], indent=4),
base64.b64decode(resolution_json["dispute_resolution"]["signature"]))
contract["dispute_resolution"] = resolution_json["dispute_resolution"]
if db.purchases.get_purchase(order_id) is not None:
db.purchases.update_status(order_id, 5)
elif db.sales.get_sale(order_id) is not None:
db.sales.update_status(order_id, 5)
with open(file_path, 'wb') as outfile:
outfile.write(json.dumps(contract, indent=4))
p = PlaintextMessage()
p.sender_guid = moderator_guid
p.handle = moderator_handle
p.pubkey = moderator_pubkey
p.subject = str(order_id)
p.type = PlaintextMessage.Type.Value("DISPUTE_CLOSE")
p.message = str(resolution_json["dispute_resolution"]["resolution"]["decision"])
p.timestamp = int(time.time())
p.avatar_hash = moderator_avatar
message_listener.notify(p, "")
notification_listener.notify(moderator_guid, moderator_handle, "dispute_close", order_id,
contract["vendor_offer"]["listing"]["item"]["title"],
contract["vendor_offer"]["listing"]["item"]["image_hashes"][0])