ruby-net-ldap/lib/net/ldap/entry.rb
2010-04-19 01:54:25 -04:00

185 lines
5.6 KiB
Ruby

##
# Objects of this class represent individual entries in an LDAP directory.
# User code generally does not instantiate this class. Net::LDAP#search
# provides objects of this class to user code, either as block parameters or
# as return values.
#
# In LDAP-land, an "entry" is a collection of attributes that are uniquely
# and globally identified by a DN ("Distinguished Name"). Attributes are
# identified by short, descriptive words or phrases. Although a directory is
# free to implement any attribute name, most of them follow rigorous
# standards so that the range of commonly-encountered attribute names is not
# large.
#
# An attribute name is case-insensitive. Most directories also restrict the
# range of characters allowed in attribute names. To simplify handling
# attribute names, Net::LDAP::Entry internally converts them to a standard
# format. Therefore, the methods which take attribute names can take Strings
# or Symbols, and work correctly regardless of case or capitalization.
#
# An attribute consists of zero or more data items called <i>values.</i> An
# entry is the combination of a unique DN, a set of attribute names, and a
# (possibly-empty) array of values for each attribute.
#
# Class Net::LDAP::Entry provides convenience methods for dealing with LDAP
# entries. In addition to the methods documented below, you may access
# individual attributes of an entry simply by giving the attribute name as
# the name of a method call. For example:
#
# ldap.search( ... ) do |entry|
# puts "Common name: #{entry.cn}"
# puts "Email addresses:"
# entry.mail.each {|ma| puts ma}
# end
#
# If you use this technique to access an attribute that is not present in a
# particular Entry object, a NoMethodError exception will be raised.
#
#--
# Ugly problem to fix someday: We key off the internal hash with a canonical
# form of the attribute name: convert to a string, downcase, then take the
# symbol. Unfortunately we do this in at least three places. Should do it in
# ONE place.
class Net::LDAP::Entry
##
# This constructor is not generally called by user code.
def initialize(dn = nil) #:nodoc:
@myhash = {}
@myhash[:dn] = [dn]
end
##
# Use the LDIF format for Marshal serialization.
def _dump(depth) #:nodoc:
to_ldif
end
##
# Use the LDIF format for Marshal serialization.
def self._load(entry) #:nodoc:
from_single_ldif_string(entry)
end
class << self
##
# Converts a single LDIF entry string into an Entry object. Useful for
# Marshal serialization. If a string with multiple LDIF entries is
# provided, an exception will be raised.
def from_single_ldif_string(ldif)
ds = Net::LDAP::Dataset.read_ldif(::StringIO.new(ldif))
return nil if ds.empty?
raise Net::LDAP::LdapError, "Too many LDIF entries" unless ds.size == 1
entry = ds.to_entries.first
return nil if entry.dn.nil?
entry
end
##
# Canonicalizes an LDAP attribute name as a \Symbol. The name is
# lowercased and, if present, a trailing equals sign is removed.
def attribute_name(name)
name = name.to_s.downcase
name = name[0..-2] if name[-1] == ?=
name.to_sym
end
end
##
# Sets or replaces the array of values for the provided attribute. The
# attribute name is canonicalized prior to assignment.
#
# When an attribute is set using this, that attribute is now made
# accessible through methods as well.
#
# entry = Net::LDAP::Entry.new("dc=com")
# entry.foo # => NoMethodError
# entry["foo"] = 12345 # => [12345]
# entry.foo # => [12345]
def []=(name, value)
@myhash[self.class.attribute_name(name)] = Kernel::Array(value)
end
##
# Reads the array of values for the provided attribute. The attribute name
# is canonicalized prior to reading. Returns an empty array if the
# attribute does not exist.
def [](name)
name = self.class.attribute_name(name)
@myhash[name] || []
end
##
# Returns the first distinguished name (dn) of the Entry as a \String.
def dn
self[:dn].first.to_s
end
##
# Returns an array of the attribute names present in the Entry.
def attribute_names
@myhash.keys
end
##
# Accesses each of the attributes present in the Entry.
#
# Calls a user-supplied block with each attribute in turn, passing two
# arguments to the block: a Symbol giving the name of the attribute, and a
# (possibly empty) \Array of data values.
def each # :yields: attribute-name, data-values-array
if block_given?
attribute_names.each {|a|
attr_name,values = a,self[a]
yield attr_name, values
}
end
end
alias_method :each_attribute, :each
##
# Converts the Entry to an LDIF-formatted String
def to_ldif
Net::LDAP::Dataset.from_entry(self).to_ldif_string
end
def respond_to?(sym) #:nodoc:
return true if valid_attribute?(self.class.attribute_name(sym))
return super
end
def method_missing(sym, *args, &block) #:nodoc:
name = self.class.attribute_name(sym)
if valid_attribute?(name )
if setter?(sym) && args.size == 1
value = args.first
value = Array(value)
self[name]= value
return value
elsif args.empty?
return self[name]
end
end
super
end
# Given a valid attribute symbol, returns true.
def valid_attribute?(attr_name)
attribute_names.include?(attr_name)
end
private :valid_attribute?
# Returns true if the symbol ends with an equal sign.
def setter?(sym)
sym.to_s[-1] == ?=
end
private :setter?
end # class Entry
require 'net/ldap/dataset' unless defined? Net::LDAP::Dataset