def on_packet(packet, user, to_server):
if not to_server:
return packet
# ENTRY
if packet.name() in ('Player position', 'Player position & look') and not check_acls(ENTRY, user):
tell(user, "You are not allowed to enter here.", delay=0.2, lock=("acl-entry-lock",user))
new_stance = packet.data['stance'] - packet.data['y'] + user.position_old[1]
packet.data['x'], packet.data['y'], packet.data['z'] = user.position_old
packet.data['stance'] = new_stance
back_packet = Packet()
back_packet.ident = 0x0B # Player position
back_packet.direction = SERVER_TO_CLIENT
back_packet.data['x'] = packet.data['x']
back_packet.data['y'] = packet.data['y']
back_packet.data['z'] = packet.data['z']
back_packet.data['stance'] = packet.data['stance']
back_packet.data['on_ground'] = packet.data['on_ground']
send_packet(back_packet, user, False)
return packet
# MODIFY (block digging)
if packet.name() == 'Player digging' and packet.data['status'] == 0:
position = (packet.data['x'], packet.data['y'], packet.data['z'])
if not check_acls(MODIFY, user, position):
tell(user, "You are not allowed to dig here.")
return []
# MODIFY/INTERACT (block placement)
if packet.name() == 'Player block placement' and not all(packet.data[key] == -1 for key in ('x','y','z','direction')):
position = add_direction((packet.data['x'], packet.data['y'], packet.data['z']), packet.data['direction'])
if packet.data['slot']['id'] in INTERACT_IDS:
if not check_acls(INTERACT, user, position):
tell(user, "You are not allowed to interact with things here.")
return []
else:
if not check_acls(MODIFY, user, position):
tell(user, "You are not allowed to place blocks here.")
# For now, we tell the client that the block in the indicated direction is empty.
# This should work almost all the time and is by far the easiest option.
back_packet = Packet()
back_packet.ident = 0x35 # Block change
back_packet.direction = SERVER_TO_CLIENT
back_packet.data['x'], back_packet.data['y'], back_packet.data['z'] = position
back_packet.data['id'] = 0
back_packet.data['metadata'] = 0
send_packet(back_packet, user, False)
# We also invalidate the packet rather than drop it, so the server auto-corrects the client's inventory
packet.data['x'] += 100
return packet
def tell(user, message, prefix=""):
"""Send a server message to user.
Note: Splits multiline messages. See prefix, below.
Optional args:
prefix: Add given prefix to every line sent, eg '<server>: '.
"""
message = unicode(message)
reverse = dict([(y, x) for x, y in packet_names.items()])
for line in message.split("\n"):
packet = Packet()
packet.ident = reverse["Chat message"]
packet.direction = SERVER_TO_CLIENT
packet.data = {"text": line}
send_packet(packet, user, False)