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Fix bug when permission overwrites could be applied out of order.

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The bug was due to the fact that the way overwrites work is by doing
a loop of all the values and then applying deny first and then allow.
That way the overwrite is defined if role A and role B deny a
permission but role C allows it (and said member has A, B, C roles)
then the resolution should allow it rather than deny it regardless of
the order of the data it is received in.
This commit is contained in:
Rapptz 2016-09-10 16:11:52 -04:00
parent bca6b2a133
commit 26f5bcd725
1 changed files with 7 additions and 1 deletions
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8
discord/channel.py
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@ -245,16 +245,22 @@ class Channel(Hashable):
return Permissions.all()
member_role_ids = set(map(lambda r: r.id, member.roles))
denies = 0
allows = 0
# Apply channel specific role permission overwrites
for overwrite in self._permission_overwrites:
if overwrite.type == 'role' and overwrite.id in member_role_ids:
base.handle_overwrite(allow=overwrite.allow, deny=overwrite.deny)
denies |= overwrite.deny
allows |= overwrite.allow
base.handle_overwrite(allow=allows, deny=denies)
# Apply member specific permission overwrites
for overwrite in self._permission_overwrites:
if overwrite.type == 'member' and overwrite.id == member.id:
base.handle_overwrite(allow=overwrite.allow, deny=overwrite.deny)
break
# default channels can always be read
if self.is_default: