=head1 NAME

Net::LDAP::LDIF - LDIF reading and writing

=head1 SYNOPSIS

 use Net::LDAP::LDIF;

 $ldif = Net::LDAP::LDIF->new( "file.ldif", "r", onerror => 'undef' );
 while ( not $ldif->eof ( ) ) {
   $entry = $ldif->read_entry ( );
   if ( $ldif->error ( ) ) {
     print "Error msg: ", $ldif->error ( ), "\n";
     print "Error lines:\n", $ldif->error_lines ( ), "\n";
   } else {
     # do stuff
   }
 }
 $ldif->done ( );

=head1 DESCRIPTION

B<Net::LDAP::LDIF> provides a means to convert between
L<Net::LDAP::Entry> objects and LDAP entries represented in LDIF
format files. Reading and writing are supported and may manipulate
single entries or lists of entries.

As when reading an entire file into memory with perl normally, take
into account the possibility of memory use when loading an LDIF file
in one go.


=head1 SPECIAL FEATURES

By default, Net::LDAP::LDIF supports reading attribute values from
URLs of type C<file://>.

When Gisle Aas' L<LWP> module package is installed, Net::LDAP::LDIF uses
it to also support reading data from the URL types supported by these
modules; most prominently C<http://>, C<https://>, and C<ftp://> resources.
This extended feature is dynamically detected at runtime.


=head1 CONSTRUCTOR

=over 4

=item new ( FILE [[, MODE ], OPTIONS ] )

Open the file with the given mode.

C<FILE> may be the name of a file or an already open filehandle. If C<FILE>
begins or ends with a C<|> then C<FILE> will be passed directly to C<open>.

C<MODE> can be any of the modes allowed for Perl's L<open()|perlfunc/open>
function, potentially extended by PerlIO layers as described in
L<perlopentut|perlopentut/IO Layers>.
Alternatively, it can be one of the mode indicators C<r>, C<r+>, C<w>,
C<w+>, C<a>, C<a+> known from C's L<fopen()|fopen> function, which get mapped to
their Perl counterparts.
If C<MODE> is omitted, it defaults to C<r> for reading.

C<OPTIONS> is a list of name/value pairs, recognizing:

=over 4

=item encode =E<gt> 'none' | 'canonical' | 'base64'

Some DN values in LDIF cannot be written verbatim and have to be encoded
in some way:

=over 4

=item 'none'

The default.

=item 'canonical'

See L<Net::LDAP::Util/canonical_dn>.

=item 'base64'

Use base64.

=back

=item onerror =E<gt> 'die' | 'warn' | 'undef'

Specify what happens when an error is detected.

=over 4

=item 'die'

C<Net::LDAP::LDIF> will croak with an appropriate message.

=item 'warn'

C<Net::LDAP::LDIF> will warn with an appropriate message.

=item 'undef'

C<Net::LDAP::LDIF> will warn with an appropriate message if C<-w> is
in effect.  The method that was called will return C<undef>.

Note this value is the string C<'undef'>, not the C<undef> value.

=back

=item change =E<gt> 1

Write entry changes to the LDIF file instead of the entries itself.
I.e. write LDAP operations acting on the entries to the file instead of the entries contents.

=item lowercase =E<gt> 1

Convert attribute names to lowercase when writing.

=item sort =E<gt> 1

Sort attribute names when writing entries according to the rule:
objectclass first then all other attributes alphabetically sorted

=item version =E<gt> '1'

Set the LDIF version to write to the resulting LDIF file.

According to RFC 2849 currently the only legal value for this option is I<1>.

When this option is set Net::LDAP::LDIF tries to adhere more strictly to the
LDIF specification in RFC2489 in a few places.

The default is I<undef> meaning no version information is written to the LDIF file.

=item wrap =E<gt> 78

Number of columns where output line wrapping shall occur.

Default is 78. Setting it to 40 or lower inhibits wrapping.

=item raw =E<gt> REGEX

Use REGEX to denote the names of attributes that are to be considered
binary when reading.

When this option is given, Net::LDAP converts all
values of attributes not matching this REGEX into Perl UTF-8 strings
so that the regular Perl operators (pattern matching, ...) can operate
as one expects even on strings with international characters.

If this option is not given, attribute values are treated as byte strings.

Example: raw =E<gt> qr/(?i:^jpegPhoto|;binary)/

=back

=back

=head1 METHODS

=over 4

=item read_entry ( )

Read one entry from the file and return it as a C<Net::LDAP::Entry>
object.

In scalar mode, the C<Net::LDAP::Entry> object is returned alone,
while in list mode a list is returned consisting of the
C<Net::LDAP::Entry> object as first element followed by  all
C<Net::LDAP::Control> objects that were part of the LDIF entry.
See RFC 2849 for details.

=item eof ( )

Returns I<true> when the end of the file is reached.

=item write_entry ( ENTRY [, OPTIONS ], ... )

Write entries to the LDIF file.

The arguments accepted are a list of entries, optionally interspersed with
options belonging to the preceding entry.

For each entry, C<OPTIONS> is a list of key-value pairs, recognizing:

=over 4

=item control =E<gt> CONTROL

=item control =E<gt> [ CONTROL, ... ]

See L<Net::LDAP/CONTROLS>.

=back

=item write_version ( )

If the object's version is defined, this method allows one to explicitly
write the version before an entry is written.

If  not called explicitly, it gets called automatically when writing
the first entry.

=item version ( [ VERSION ] )

If called without arguments it returns the version of the LDIF file
or undef if no version has been set.
If called with an argument it sets the LDIF version to VERSION.

According to RFC 2849 currently the only legal value for VERSION is I<1>.

=item handle ( )

Returns the file handle the C<Net::LDAP::LDIF> object reads from
or writes to.

=item done ( )

This method signals that the LDIF object is no longer needed. If a
file was opened automatically when the object was created it will be
closed. This method is called automatically via DESTROY when the
object goes out of scope.

=item error ( )

Returns error message if error was found.

=item error_lines ( )

Returns lines that resulted in error.

=item current_entry ( )

Returns the current C<Net::LDAP::Entry> object.

=item current_lines ( )

Returns the lines that generated the current C<Net::LDAP::Entry>
object.

=item next_lines ( )

Returns the lines that will generate the next C<Net::LDAP::Entry>
object.

=back

=head1 AUTHOR

Graham Barr E<lt>gbarr@pobox.comE<gt>.

Please report any bugs, or post any suggestions, to the perl-ldap
mailing list E<lt>perl-ldap@perl.orgE<gt>.

=head1 COPYRIGHT

Copyright (c) 1997-2004 Graham Barr. All rights reserved. This program
is free software; you can redistribute it and/or modify it under the
same terms as Perl itself.

=cut