diff .svn/pristine/bc/bc0c969dde0ae26fdb5eed30992ca79327b8efb8.svn-base @ 926:b73a59a6acbd luisf

Merge from cannam_integration

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.svn/pristine/bc/bc0c969dde0ae26fdb5eed30992ca79327b8efb8.svn-base	Fri May 11 16:10:11 2012 +0100
@@ -0,0 +1,387 @@
+# $Id: filter.rb 151 2006-08-15 08:34:53Z blackhedd $
+#
+#
+#----------------------------------------------------------------------------
+#
+# 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 Net::LDAP::Filter is used to constrain
+# LDAP searches. An object of this class is
+# passed to Net::LDAP#search in the parameter :filter.
+#
+# Net::LDAP::Filter supports the complete set of search filters
+# available in LDAP, including conjunction, disjunction and negation
+# (AND, OR, and NOT). This class supplants the (infamous) RFC-2254
+# standard notation for specifying LDAP search filters.
+#
+# Here's how to code the familiar "objectclass is present" filter:
+#  f = Net::LDAP::Filter.pres( "objectclass" )
+# The object returned by this code can be passed directly to
+# the <tt>:filter</tt> parameter of Net::LDAP#search.
+#
+# See the individual class and instance methods below for more examples.
+#
+class Filter
+
+  def initialize op, a, b
+    @op = op
+    @left = a
+    @right = b
+  end
+
+  # #eq creates a filter object indicating that the value of
+  # a paticular attribute must be either <i>present</i> or must
+  # match a particular string.
+  #
+  # To specify that an attribute is "present" means that only
+  # directory entries which contain a value for the particular
+  # attribute will be selected by the filter. This is useful
+  # in case of optional attributes such as <tt>mail.</tt>
+  # Presence is indicated by giving the value "*" in the second
+  # parameter to #eq. This example selects only entries that have
+  # one or more values for <tt>sAMAccountName:</tt>
+  #  f = Net::LDAP::Filter.eq( "sAMAccountName", "*" )
+  #
+  # To match a particular range of values, pass a string as the
+  # second parameter to #eq. The string may contain one or more
+  # "*" characters as wildcards: these match zero or more occurrences
+  # of any character. Full regular-expressions are <i>not</i> supported
+  # due to limitations in the underlying LDAP protocol.
+  # This example selects any entry with a <tt>mail</tt> value containing
+  # the substring "anderson":
+  #  f = Net::LDAP::Filter.eq( "mail", "*anderson*" )
+  #--
+  # Removed gt and lt. They ain't in the standard!
+  #
+  def Filter::eq attribute, value; Filter.new :eq, attribute, value; end
+  def Filter::ne attribute, value; Filter.new :ne, attribute, value; end
+  #def Filter::gt attribute, value; Filter.new :gt, attribute, value; end
+  #def Filter::lt attribute, value; Filter.new :lt, attribute, value; end
+  def Filter::ge attribute, value; Filter.new :ge, attribute, value; end
+  def Filter::le attribute, value; Filter.new :le, attribute, value; end
+
+  # #pres( attribute ) is a synonym for #eq( attribute, "*" )
+  #
+  def Filter::pres attribute; Filter.eq attribute, "*"; end
+
+  # operator & ("AND") is used to conjoin two or more filters.
+  # This expression will select only entries that have an <tt>objectclass</tt>
+  # attribute AND have a <tt>mail</tt> attribute that begins with "George":
+  #  f = Net::LDAP::Filter.pres( "objectclass" ) & Net::LDAP::Filter.eq( "mail", "George*" )
+  #
+  def & filter; Filter.new :and, self, filter; end
+
+  # operator | ("OR") is used to disjoin two or more filters.
+  # This expression will select entries that have either an <tt>objectclass</tt>
+  # attribute OR a <tt>mail</tt> attribute that begins with "George":
+  #  f = Net::LDAP::Filter.pres( "objectclass" ) | Net::LDAP::Filter.eq( "mail", "George*" )
+  #
+  def | filter; Filter.new :or, self, filter; end
+
+
+  #
+  # operator ~ ("NOT") is used to negate a filter.
+  # This expression will select only entries that <i>do not</i> have an <tt>objectclass</tt>
+  # attribute:
+  #  f = ~ Net::LDAP::Filter.pres( "objectclass" )
+  #
+  #--
+  # This operator can't be !, evidently. Try it.
+  # Removed GT and LT. They're not in the RFC.
+  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_s.to_ber_contextspecific 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_s.to_ber, seq.to_ber].to_ber_contextspecific 4
+      else                      #equality
+        [@left.to_s.to_ber, @right.to_ber].to_ber_contextspecific 3
+      end
+    when :ge
+      [@left.to_s.to_ber, @right.to_ber].to_ber_contextspecific 5
+    when :le
+      [@left.to_s.to_ber, @right.to_ber].to_ber_contextspecific 6
+    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
+
+
+
+  #--
+  # We get a Ruby object which comes from parsing an RFC-1777 "Filter"
+  # object. Convert it to a Net::LDAP::Filter.
+  # TODO, we're hardcoding the RFC-1777 BER-encodings of the various
+  # filter types. Could pull them out into a constant.
+  #
+  def Filter::parse_ldap_filter obj
+    case obj.ber_identifier
+    when 0x87         # present. context-specific primitive 7.
+      Filter.eq( obj.to_s, "*" )
+    when 0xa3         # equalityMatch. context-specific constructed 3.
+      Filter.eq( obj[0], obj[1] )
+    else
+      raise LdapError.new( "unknown ldap search-filter type: #{obj.ber_identifier}" )
+    end
+  end
+
+
+  #--
+  # We got a hash of attribute values.
+  # Do we match the attributes?
+  # Return T/F, and call match recursively as necessary.
+  def match entry
+    case @op
+    when :eq
+      if @right == "*"
+        l = entry[@left] and l.length > 0
+      else
+        l = entry[@left] and l = l.to_a and l.index(@right)
+      end
+    else
+      raise LdapError.new( "unknown filter type in match: #{@op}" )
+    end
+  end
+
+  # Converts an LDAP filter-string (in the prefix syntax specified in RFC-2254)
+  # to a Net::LDAP::Filter.
+  def self.construct ldap_filter_string
+    FilterParser.new(ldap_filter_string).filter
+  end
+
+  # Synonym for #construct.
+  # to a Net::LDAP::Filter.
+  def self.from_rfc2254 ldap_filter_string
+    construct ldap_filter_string
+  end
+
+end # class Net::LDAP::Filter
+
+
+
+class FilterParser #:nodoc:
+
+  attr_reader :filter
+
+  def initialize str
+    require 'strscan'
+    @filter = parse( StringScanner.new( str )) or raise Net::LDAP::LdapError.new( "invalid filter syntax" )
+  end
+
+  def parse scanner
+    parse_filter_branch(scanner) or parse_paren_expression(scanner)
+  end
+
+  def parse_paren_expression scanner
+    if scanner.scan(/\s*\(\s*/)
+      b = if scanner.scan(/\s*\&\s*/)
+        a = nil
+        branches = []
+        while br = parse_paren_expression(scanner)
+          branches << br
+        end
+        if branches.length >= 2
+          a = branches.shift
+          while branches.length > 0
+            a = a & branches.shift
+          end
+          a
+        end
+      elsif scanner.scan(/\s*\|\s*/)
+        # TODO: DRY!
+        a = nil
+        branches = []
+        while br = parse_paren_expression(scanner)
+          branches << br
+        end
+        if branches.length >= 2
+          a = branches.shift
+          while branches.length > 0
+            a = a | branches.shift
+          end
+          a
+        end
+      elsif scanner.scan(/\s*\!\s*/)
+        br = parse_paren_expression(scanner)
+        if br
+          ~ br
+        end
+      else
+        parse_filter_branch( scanner )
+      end
+
+      if b and scanner.scan( /\s*\)\s*/ )
+        b
+      end
+    end
+  end
+
+  # Added a greatly-augmented filter contributed by Andre Nathan
+  # for detecting special characters in values. (15Aug06)
+  def parse_filter_branch scanner
+    scanner.scan(/\s*/)
+    if token = scanner.scan( /[\w\-_]+/ )
+      scanner.scan(/\s*/)
+      if op = scanner.scan( /\=|\<\=|\<|\>\=|\>|\!\=/ )
+        scanner.scan(/\s*/)
+        #if value = scanner.scan( /[\w\*\.]+/ ) (ORG)
+        if value = scanner.scan( /[\w\*\.\+\-@=#\$%&!]+/ )
+          case op
+          when "="
+            Filter.eq( token, value )
+          when "!="
+            Filter.ne( token, value )
+          when "<"
+            Filter.lt( token, value )
+          when "<="
+            Filter.le( token, value )
+          when ">"
+            Filter.gt( token, value )
+          when ">="
+            Filter.ge( token, value )
+          end
+        end
+      end
+    end
+  end
+
+end # class Net::LDAP::FilterParser
+
+end # class Net::LDAP
+end # module Net
+
+