ruby-net-ldap/lib/net/ldapfilter.rb

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# $Id$
#
#
#----------------------------------------------------------------------------
#
# Copyright (C) 2006 by Francis Cianfrocca. All Rights Reserved.
#
# Gmail: garbagecat10
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
#---------------------------------------------------------------------------
#
#
module Net
class LDAP
class Filter
def initialize op, a, b
@op = op
@left = a
@right = b
end
def Filter::eq a, b; Filter.new :eq, a, b; end
def Filter::ne a, b; Filter.new :ne, a, b; end
def Filter::gt a, b; Filter.new :gt, a, b; end
def Filter::lt a, b; Filter.new :lt, a, b; end
def Filter::ge a, b; Filter.new :ge, a, b; end
def Filter::le a, b; Filter.new :le, a, b; end
def & a; Filter.new :and, self, a; end
def | a; Filter.new :or, self, a; end
# This operator can't be !, evidently. Try it.
def ~@; Filter.new :not, self, nil; end
def to_s
case @op
when :ne
"(!(#{@left}=#{@right}))"
when :eq
"(#{@left}=#{@right})"
when :gt
"#{@left}>#{@right}"
when :lt
"#{@left}<#{@right}"
when :ge
"#{@left}>=#{@right}"
when :le
"#{@left}<=#{@right}"
when :and
"(&(#{@left})(#{@right}))"
when :or
"(|(#{@left})(#{@right}))"
when :not
"(!(#{@left}))"
else
raise "invalid or unsupported operator in LDAP Filter"
end
end
#
# to_ber
# Filter ::=
# CHOICE {
# and [0] SET OF Filter,
# or [1] SET OF Filter,
# not [2] Filter,
# equalityMatch [3] AttributeValueAssertion,
# substrings [4] SubstringFilter,
# greaterOrEqual [5] AttributeValueAssertion,
# lessOrEqual [6] AttributeValueAssertion,
# present [7] AttributeType,
# approxMatch [8] AttributeValueAssertion
# }
#
# SubstringFilter
# SEQUENCE {
# type AttributeType,
# SEQUENCE OF CHOICE {
# initial [0] LDAPString,
# any [1] LDAPString,
# final [2] LDAPString
# }
# }
#
# Parsing substrings is a little tricky.
# We use the split method to break a string into substrings
# delimited by the * (star) character. But we also need
# to know whether there is a star at the head and tail
# of the string. A Ruby particularity comes into play here:
# if you split on * and the first character of the string is
# a star, then split will return an array whose first element
# is an _empty_ string. But if the _last_ character of the
# string is star, then split will return an array that does
# _not_ add an empty string at the end. So we have to deal
# with all that specifically.
#
def to_ber
case @op
when :eq
if @right == "*" # present
@left.to_ber_application_string 7
elsif @right =~ /[\*]/ #substring
ary = @right.split( /[\*]+/ )
final_star = @right =~ /[\*]$/
initial_star = ary.first == "" and ary.shift
seq = []
unless initial_star
seq << ary.shift.to_ber_contextspecific(0)
end
n_any_strings = ary.length - (final_star ? 0 : 1)
p n_any_strings
n_any_strings.times {
seq << ary.shift.to_ber_contextspecific(1)
}
unless final_star
seq << ary.shift.to_ber_contextspecific(2)
end
[@left.to_ber, seq.to_ber].to_ber_contextspecific 4
else #equality
[@left.to_ber, @right.to_ber].to_ber_contextspecific 3
end
when :and
ary = [@left.coalesce(:and), @right.coalesce(:and)].flatten
ary.map {|a| a.to_ber}.to_ber_contextspecific( 0 )
when :or
ary = [@left.coalesce(:or), @right.coalesce(:or)].flatten
ary.map {|a| a.to_ber}.to_ber_contextspecific( 1 )
when :not
[@left.to_ber].to_ber_contextspecific 2
else
# ERROR, we'll return objectclass=* to keep things from blowing up,
# but that ain't a good answer and we need to kick out an error of some kind.
raise "unimplemented search filter"
end
end
#
# coalesce
# This is a private helper method for dealing with chains of ANDs and ORs
# that are longer than two. If BOTH of our branches are of the specified
# type of joining operator, then return both of them as an array (calling
# coalesce recursively). If they're not, then return an array consisting
# only of self.
#
def coalesce operator
if @op == operator
[@left.coalesce( operator ), @right.coalesce( operator )]
else
[self]
end
end
end # class Net::LDAP::Filter
end # class Net::LDAP
end # module Net
#-----------------------------------
if __FILE__ == $0
puts "No default action"
end