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def self.hook_before_create(item)
hook_common(item)
end

def self.hook_before_modify(item)
hook_common(item)
end

def self.hook_common(item)
pconfig_default = {
:default_group => 'users',
:min_uid => 1000,
:max_uid => 65535,
:step_uid => 100,
:default_home_base => "/home"
}
pconfig = pconfig_default.merge(self.parameters[:plugin])

unless item.attribute_present?('gidNumber')
item.primaryGroup = item.class.shadow.get_object(:group).find(:first, pconfig[:default_group])
end

if item.attribute_present?('uidNumber')
user = ActiveLdap::Base.find(:first, :scope => :sub, :filter => "(&(objectClass=posixAccount)(uidNumber=#{item.uidNumber}))", :attributes => ['uidNumber'])
unless user.nil? or user.dn == item.dn
raise_error "UID already used by another item"
end
else
users = ActiveLdap::Base.find(:all, :scope => :sub, :filter => "(&(objectClass=posixAccount)(uidNumber=*))", :attributes => ['uidNumber'])
uidnumbers = users.collect {|user| user.uidNumber }

avail_uidnumber = nil
min_uidn = pconfig[:min_uid]
max_uidn = [min_uidn + pconfig[:step_uid], pconfig[:max_uid]].min
while avail_uidnumber.nil?
avail = (min_uidn..max_uidn).to_a - uidnumbers
unless avail.empty?
avail_uidnumber = avail.first
break
end
min_uidn = max_uidn
max_uidn = [min_uidn + pconfig[:step_uid], pconfig[:max_uid]].min
end

if avail_uidnumber.nil?
raise_error "Available UID range is depleted."
else
item.uidNumber = avail_uidnumber
end
end

unless item.attribute_present?('homeDirectory')
item.homeDirectory = File.join(pconfig[:default_home_base], item.uid)
end
end
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