LDIF

Section: User Contributed Perl Documentation (3)
Updated: 2007-06-14
Index Return to Main Contents
 

NAME

Mozilla::LDAP::LDIF - read or write LDIF (LDAP Data Interchange Format)  

SYNOPSIS

 use Mozilla::LDAP::LDIF
    qw(set_Entry get_LDIF put_LDIF unpack_LDIF pack_LDIF
       sort_attributes references enlist_values delist_values
       read_v1 read_v0 read_file_URL_or_name);

 $ldif = Mozilla::LDAP::LDIF->new(*FILEHANDLE, \&read_reference, $comments);
 @record = get $ldif;
 @records = get $ldif ($maximum_number);
 $entry = set_Entry (\entry, \@record);
 $entry = readOneEntry $ldif;
 @entries = readEntries $ldif ($maximum_number);

 $ldif = Mozilla::LDAP::LDIF->new(*FILEHANDLE, $options);
 $success = put $ldif (@record);
 $success = put $ldif (\@record, \object ...);
 $success = writeOneEntry $ldif (\entry);
 $success = writeEntries  $ldif (\entry, \entry ...);

 @record = get_LDIF (*FILEHANDLE, $eof, \&read_reference, $comments);
 @record = get_LDIF; # *STDIN

 $success = put_LDIF (*FILEHANDLE, $options, @record);
 $success = put_LDIF (*FILEHANDLE, $options, \@record, \object ...);

 @record = unpack_LDIF ($string, \&read_reference, $comments);

 $string = pack_LDIF ($options, @record);
 $string = pack_LDIF ($options, \@record, \object ...);

 @record = enlist_values (@record);
 @record = delist_values (@record);

 @record = sort_attributes (@record);

 $DN  = LDIF_get_DN (@record); # alias get_DN
 @DNS = LDIF_get_DN (\@record, \object ...); # alias get_DN

 $offset = next_attribute (\@record, $offset, @options);

 @references = references (@record);
 @references = references (\@record, \object ...);

 $success = read_v1 (\$url);  # alias read_file_URL
 $success = read_v0 (\$name); # alias read_file_name
 $success = read_file_URL_or_name (\$url_or_name);

 

REQUIRES

MIME::Base64, Exporter, Carp  

INSTALLATION

Put the LDIF.pm file into a subdirectory named Mozilla/LDAP, in one of the directories named in @INC. site_perl is a good choice.  

EXPORTS

Nothing (unless you request it).  

DESCRIPTION

LDIF version 1 is defined by <draft-good-ldap-ldif-03>. An LDIF record like this:

    DN: cn=Foo Bar, o=ITU
    cn: Foo Bar
    Sn: Bar
    objectClass: person
    objectClass: organizatio
     nalPerson
    jpegPhoto:< file:foobar.jpg
    # comment

corresponds (in this module) to a Perl array like this:

    (DN => "cn=Foo Bar, o=ITU",
     cn => "Foo Bar",
     Sn => "Bar",
     objectClass => [ "person", "organizationalPerson" ],
     jpegPhoto => \"file:foobar.jpg",
     '# comment', undef
    )

URLs or file names are read by a separate function. This module provides functions to read a file name (LDIF version 0) or a file URL that names a local file (minimal LDIF version 1), or either. You can supply a similar function to read other forms of URL.

Most output and utility methods in this module accept a parameter list that is either an LDIF array (the first item is a string, usually ``dn''), or a list of references, with each reference pointing to either an LDIF array or an object from which this module can get LDIF arrays by calling the object's getLDIFrecords method. This module calls $object->getLDIFrecords(), expecting it to return a list of references to LDIF arrays. getLDIFrecords may return references to the object's own data, although it should not return references to anything that will be modified as a side-effect of another call to getLDIFrecords(), on any object.  

METHODS

 

Input

new Mozilla::LDAP::LDIF (*FILEHANDLE, \&read_reference, $comments)
Create and return an object to read LDIF from the given file. If *FILEHANDLE is not defined, return an object to read from *STDIN.

If \&read_reference is defined, call it when reading each reference to another data source, with ${$_[$[]} equal to the reference. The function should copy the referent (for example, the contents of the named file) into $_[$[].

Ignore LDIF comment lines, unless $comments eq ``comments''.

get $ldif
Read an LDIF record from the given file. Combine continuation lines and base64-decode attribute values. Return an array of strings, representing the record. Return a false value if end of file is encountered before an LDIF record.
get $ldif ($maximum_number)
Read LDIF records from the given file, until end of file is encountered or the given $maximum_number of records are read. If $maximum_number is undef (or negative), read until end of file. Return an array of references to arrays, each representing one record. Return a false value if end of file is encountered before an LDIF record, or $maximum_number is zero.
readOneEntry $ldif
readEntries $ldif ($maximum_number)
Read Mozilla::LDAP::Entry objects from the given file, and return references to them. Call Mozilla::LDAP::Conn->newEntry() to create each returned object. Return a false value if end of file is encountered before an LDIF record, or $maximum_number is zero. readOneEntry returns a reference to a single object. readEntries returns an array of references to as many as $maximum_number objects. See get (above) for more information.
set_Entry (\entry, \@record)
Set the DN and attributes of the given Mozilla::LDAP::Entry object from the given LDIF record. Return a reference to the entry.
get_LDIF (*FILEHANDLE, $eof, \&read_reference, $comments)
Read an LDIF record from the given file. Return an array of strings, representing the record. Return a false value if end of file is encountered before an LDIF record.

If *FILEHANDLE is not defined, read from *STDIN.

If $eof is passed, set it true if the end of the given file was encountered; otherwise set it false. This function may set $eof false and also return a record (if the record was terminated by the end of file).

If \&read_reference is defined, call it when reading each reference to another data source, with ${$_[$[]} equal to the reference. The function should copy the referent (for example, the contents of the named file) into $_[$[].

Ignore LDIF comment lines, unless $comments eq ``comments''.

unpack_LDIF ($string, \&read_reference, $comments)
Read one LDIF record from the given string. Return an array of strings, representing the record. Return a false value if the given string doesn't contain an LDIF record.

If \&read_reference is defined, call it when reading each reference to another data source, with ${$_[$[]} equal to the reference. The function should copy the referent (for example, the contents of the named file) into $_[$[].

Ignore LDIF comment lines, unless $comments eq ``comments''.

read_v1 (\$url)
read_file_URL (\$url)
Change the parameter, from a reference to a URL (string) to a string containing a copy of the contents of the file named by that URL, and return true. Return false if the URL doesn't name a local file, or the file can't be read.

This implements LDIF version 1, although it doesn't support URLs that refer to anything but a local file (e.g. HTTP or FTP URLs).

read_v0 (\$name)
read_file_name (\$name)
Change the parameter, from a reference to a file name to a string containing a copy of the contents of that file, and return true. Return false if the file can't be read.

This implements LDIF version 0.

read_file_URL_or_name (\$url_or_name)
Change the parameter, from a reference to a URL or file name, to a string containing a copy of the contents of the file it names, and return true. Return false if the file can't be read.
 

Output

Mozilla::LDAP::LDIF->new(*FILEHANDLE, $options)
Create and return an object used to write LDIF to the given file. $options are described below.
put $ldif (@record)
put $ldif (\@record, \object ...)
put_LDIF (*FILEHANDLE, $options, @record)
put_LDIF (*FILEHANDLE, $options, \@record, \object ...)
Write LDIF records to the given file. $options are described below.
writeOneEntry $ldif (\entry)
writeEntries $ldif (\entry, \entry ...)
Write Mozilla::LDAP::Entry objects to the given file.
pack_LDIF ($options, @record)
pack_LDIF ($options, \@record, \object ...)
Return an LDIF string, representing the given records.
$options
The options parameter (above) may be either "undef", indicating all default options, or a number, which is equivalent to "[max_line =>" number"]", or a reference to an array that contains a list of options, composed from:
max_line => number
If number > 1, break output into continuation lines, so no line is longer than number bytes (not counting the end-of-line marker).

Default: 0 (output is not broken into continuation lines).

encode => pattern
Base64 encode output values that match pattern. Warning: As a rule, your pattern should match any value that contains an output line separator (see the SEP option, below). If any such value is not Base64 encoded, it will be output in a form that does not represent the separator bytes in LDIF form. That is, if the output is parsed as LDIF, the resulting value will be like the original value, except the separator bytes will be removed.

Default: "^[:< ]|[^ -\x7E]"

For example:

    pack_LDIF ([encode=>"^ |[^ -\xFD]"], @record)

returns a string in which UTF-8 strings are not encoded (unless they begin with a space or contain control characters) and lines are not continued. Such a string may be easier to view or edit than standard LDIF, although it's more prone to be garbled when sent in email or processed by software designed for ASCII. It can be parsed without loss of information (by unpack_LDIF).

sep => string
Output string at the end of each line.

Default: "\n" (the usual line separator, for output text).

output_separator ()
Return the standard LDIF line separator most similar to ``\n''. The output option "[sep => output_separator()]" is recommended, if you want to produce standard LDIF output.
 

Utilities

sort_attributes (@record)
sort_attributes (\@record, \object ...)
Return a record equivalent to each parameter, except with the attributes sorted, primarily by attribute name (ignoring case) and secondarily by attribute value (using &cmp). If the parameter list is a single record, return a single record; otherwise return a list of references to records.
enlist_values (@record)
enlist_values (\@record, \object ...)
Return a record equivalent to the parameter, except with values of the same attribute type combined into a nested array. For example,

    enlist_values (givenName => "Joe", givenname => "Joey", GivenName => "Joseph")

returns

    (givenName => ["Joe", "Joey", "Joseph"])

If the parameter list is a single record, return a single record; otherwise return a list of references to records.

delist_values (@record)
delist_values (\@record, \object ...)
Return a record equivalent to the parameter, except with all values contained directly (not in a nested array). For example,

    delist_values (givenName => ["Joe", "Joey", "Joseph"])

returns

    (givenName => "Joe", givenName => "Joey", givenName => "Joseph")

If the parameter list is a single record, return a single record; otherwise return a list of references to records.

references (@record)
references (\@record, \object ...)
In list context, return a list of references to each of the references to external data sources, in the given records. In scalar context, return the length of that list; that is, the total number of references to external data sources.
LDIF_get_DN (@record)
get_DN (@record)
Return the DN of the given record. Return undef if the first attribute of the record isn't a DN.
LDIF_get_DN (\@record, \object ...)
get_DN (\@record, \object ...)
Return the DN of each of the given records, as an array with one element for each parameter. If a given record's first attribute isn't a DN, the corresponding element of the returned array is undef.
next_attribute (\@record, $offset, @options)
Return the offset of an attribute type in the given record. Search forward, starting at $offset + 1, or 0 if $offset is not defined. Return undef if no attribute is found. The @options list is composed of zero or more of the following:
name => expression
type => expression
Don't return an offset unless the given expression evaluates to TRUE, with $_ aliased to the attribute type name.
value => expression
Don't return an offset unless the given expression evaluates to TRUE, with $_ aliased to one of the attribute values.

In either case, the expression may be a string, which is simply evaluated (using eval), or a reference to a subroutine, which is called with $_ as its only parameter. The value returned by eval or the subroutine is taken as the result of evaluation.

If no options are given, the offset of the next attribute is returned.

Option expressions can modify the record, since they are passed an alias to an element of the record. An option can selectively prevent the evaluation of subsequent options: options are evaluated in the order they appear in the @options list, and if an option evaluates to FALSE, subsequent options are not evaluated.

 

DIAGNOSTICS

$0 can't open %s: $!
(W) Mozilla::LDAP::LDIF::read_file_* failed to open a file, probably named in an LDIF attrval-spec.
$0 non-LDIF line: %s
(D) The input contains a line that can't be parsed as LDIF. It is carried along in place of an attribute name, with an undefined value. For example, unpack_LDIF(``abc'') outputs this warning, and returns (``abc'', undef).
Can't use MIME::Base64
(F) The MIME::Base64 module isn't installed. To rectify this, get a copy of MIME::Base64 from http://www.perl.com/CPAN/modules/by-module/MIME/ and install it. If you have trouble, try simply putting Base64.pm in a subdirectory named MIME, in one of the directories named in @INC (site_perl is a good choice). You'll get a correct, but relatively slow implementation.
Useless use of %s in scalar or void context
(W) The function returns multiple records, of which all but the last will be ignored by the caller. Time and space were wasted to create them. It would probably be better to call the function in list context, or to pass it only a single record.
 

EXAMPLES

    use Mozilla::LDAP::LDIF qw(read_file_URL_or_name);

    $in  = Mozilla::LDAP::LDIF->new(*STDIN, \&read_file_URL_or_name);
    $out = Mozilla::LDAP::LDIF->new(*STDOUT, 78);
    @records = get $in (undef); # read to end of file (^D)
    put $out (@records);

    use Mozilla::LDAP::Conn();

    $conn = Mozilla::LDAP::Conn->new(...);
    while ($entry = readOneEntry $in) {
        add $conn ($entry);
    }

    use Mozilla::LDAP::LDIF qw(get_LDIF put_LDIF
        references read_v1 next_attribute sort_attributes);

    while (@record = get_LDIF (*STDIN, $eof)) {
        # Resolve all the file URLs:
        foreach my $r (references (@record)) {
            read_v1 ($$r);
        }
        # Capitalize all the attribute names:
        for ($r = undef; defined ($r = next_attribute (\@record, $r)); ) {
            $record[$r] = ucfirst $record[$r];
        }
        # Capitalize all the title values:
        next_attribute (\@record, undef,
                        type => '"title" eq lc $_',
                        value => '$_ = ucfirst; 0');
        # Sort the attributes and output the record, 78 characters per line:
        put_LDIF (*STDOUT, 78, sort_attributes (@record));
        last if $eof;
    }

 

BUGS

Output Line Separator
Output lines are separated by ``\n'', by default. Although this works well in many cases, it is not standard LDIF unless ``\n'' is ``\012'' or ``\015\012''. It is not, on some platforms (Macintosh, for example). To get standard output, use the output option "[sep => Mozilla::LDAP::LDIF::output_separator()]".
Input Line Separator
This package may fail to read standard LDIF correctly, if the input record separator is not LF. To avoid this bug, set $/ = ``\012''. Other values of $/ work less well: CR ($/ eq ``\015'') handles input separated by CR or CR LF, but not LF alone; and CR LF ($/ eq ``\015\012'') handles input separated by CR LF, but not LF alone.

This bug arises when handling standard LDIF received 'raw' via the Internet (via HTTP, for example). There's no problem with an input file that has been converted (as generic text) from standard Internet line separators to $/ (that is, the usual line separator for the local platform).

 

AUTHOR

John Kristian <kristian@netscape.com>

Thanks to Leif Hedstrom, from whose code I took ideas; and to the users who took the trouble to correct my mistakes. But I accept all blame.  

SEE ALSO

Mozilla::LDAP::Entry, Mozilla::LDAP::Conn, and of course Perl.


 

Index

NAME
SYNOPSIS
REQUIRES
INSTALLATION
EXPORTS
DESCRIPTION
METHODS
Input
Output
Utilities
DIAGNOSTICS
EXAMPLES
BUGS
AUTHOR
SEE ALSO

linux.jgfs.net manual pages