GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages


Manual Reference Pages  -  DBIX::CLASS::DIGESTCOLUMNS (3)

.ds Aq ’

NAME

DBIx::Class::DigestColumns - Automatic digest columns

CONTENTS

SYNOPSIS

In your DBIx::Class table class:



  __PACKAGE__->load_components(qw/DigestColumns ... Core/);

  #automatically generate a method "check_password" in result class
  __PACKAGE__->add_columns(
    password => {
      data_type => char,
      size      => 32,
      digest_check_method => check_password,
  }
  __PACKAGE__->digestcolumns(
      columns   => [qw/ password /],
      algorithm => MD5,
      encoding  => base64,
      dirty     => 1,
      auto      => 1,
  );



<B>Note:B> The component needs to be loaded before Core.

Alternatively you could call each method individually



  __PACKAGE__->digest_columns(qw/ password /);
  __PACKAGE__->digest_algorithm(MD5);
  __PACKAGE__->digest_encoding(base64);
  __PACKAGE__->digest_dirty(1);
  __PACKAGE__->digest_auto(1);



DESCRIPTION

This DBIx::Class component can be used to automatically insert a message digest of selected columns. By default DigestColumns will use Digest::MD5 to insert a 128-bit hexadecimal message digest of the column value.

The length of the inserted string will be 32 and it will only contain characters from this set: ’0’..’9’ and ’a’..’f’.

If you would like to use a specific digest module to create your message digest, you can set digest_algorithm:



  __PACKAGE__->digest_algorithm(SHA-1);



Options added to add_column

digest_check_method => CW$method_name

By using the digest_check_method attribute when you declare a column you can create a check method for that column. The check method accepts a plain text string, performs the correct digest on it and returns a boolean value indicating whether this method matches the currently_stored value.



  $row->password(old_password);
  $row->update;
  $row->password(new_password);
  $row->check_password(new_password); #returns true
  $row->check_password(old_password); #returns false
  $row->update;



METHODS

    digestcolumns



  __PACKAGE__->digestcolumns(
      columns   => [qw/ password /],
      algorithm => $algorithm,
      encoding  => $encoding,
      dirty     => 1,
      auto      => 1,
  );



Calls digest_columns, digest_algorithm, and digest_encoding and digest_auto if the corresponding argument is defined.

    register_column

Override the original register_column to handle the creation of check methods.

    digest_columns

Takes a list of columns to be convert to a message digest during insert.



  __PACKAGE__->digest_columns(qw/ password /);



    digest_algorithm

Takes the name of a digest algorithm to be used to calculate the message digest.



  __PACKAGE__->digest_algorithm(SHA-1);



If a suitible digest module could not be loaded an exception will be thrown.

Supported digest algorithms are:



  MD5
  MD4
  MD2
  SHA-1
  SHA-256
  SHA-384
  SHA-512
  CRC-16
  CRC-32
  CRC-CCITT
  HMAC-SHA-1
  HMAC-MD5
  Whirlpool
  Adler-32



digest_algorithm defaults to MD5.

    digest_encoding

Selects the encoding to use for the message digest.



  __PACKAGE__->digest_encoding(base64);



Possilbe encoding schemes are:



  binary
  hex
  base64



digest_encoding defaults to hex.

_get_digest_string CW$value

Handles the actual encoding of column values into digests. When given a $value it will return the digest string for that value. This is the method used by _digest_column_values So you can use it to create an identical digest if you need one for comparison (e.g. password authentication).

    _digest_column_values

Go through the columns and digest the values that need it.

This method is called by insert and update when automatic digests are turned on. If dirty is enabled it will only digest the values of dirtied columns.

    digest_auto



  __PACKAGE__->digest_auto(1);



Turns on and off automatic digest columns. When on, this feature makes all UPDATEs and INSERTs automatically insert a message digest of selected columns.

The default is for digest_auto is to be on.

    digest_dirty



  __PACKAGE__->digest_dirty(1);



Turns on and off the limiting of automatic digests to only dirty columns. When on, only columns that have been dirtied will have their values digested during UPDATEs and INSERTs. If auto is set to off this option does nothing.

The default is for digest_dirty is to be off to mantain compatibility with older versions of this module.

EXTENDED METHODS

The following DBIx::Class::Row methods are extended by this module:-
insert
update

SEE ALSO

DBIx::Class, Digest

AUTHOR

Tom Kirkpatrick (tkp) <tkp@cpan.org>

With contributions from Guillermo Roditi (groditi) <groditi@cpan.org> and Marc Mims <marc@questright.com>

LICENSE

You may distribute this code under the same terms as Perl itself.
Search for    or go to Top of page |  Section 3 |  Main Index


perl v5.20.3 DBIX::CLASS::DIGESTCOLUMNS (3) 2016-04-03

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.