NAME

DBIx::Class::EncodedColumn - Automatically encode columns

SYNOPSIS

In your DBIx::Class Result class (sometimes erroneously referred to as the 'table' class):

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

  #Digest encoder with hex format and SHA-1 algorithm
  __PACKAGE__->add_columns(
    'password' => {
      data_type     => 'CHAR',
      size          => 40,
      encode_column => 1,
      encode_class  => 'Digest',
      encode_args   => {algorithm => 'SHA-1', format => 'hex'},
  }

  #SHA-1 / hex encoding / generate check method
  __PACKAGE__->add_columns(
    'password' => {
      data_type   => 'CHAR',
      size        => 40 + 10,
      encode_column => 1,
      encode_class  => 'Digest',
      encode_args   => {algorithm => 'SHA-1', format => 'hex', salt_length => 10},
      encode_check_method => 'check_password',
  }

  #MD5 /  base64 encoding / generate check method
  __PACKAGE__->add_columns(
    'password' => {
      data_type => 'CHAR',
      size      => 22,
      encode_column => 1,
      encode_class  => 'Digest',
      encode_args   => {algorithm => 'MD5', format => 'base64'},
      encode_check_method => 'check_password',
  }

  #Eksblowfish bcrypt / cost of 8/ no key_nul / generate check method
  __PACKAGE__->add_columns(
    'password' => {
      data_type => 'CHAR',
      size      => 59,
      encode_column => 1,
      encode_class  => 'Crypt::Eksblowfish::Bcrypt',
      encode_args   => { key_nul => 0, cost => 8 },
      encode_check_method => 'check_password',
  }

In your application code:

   #updating the value.
   $row->password('plaintext');
   my $digest = $row->password;

   #checking against an existing value with a check_method
   $row->check_password('old_password'); #true
   $row->password('new_password');
   $row->check_password('new_password'); #returns true
   $row->check_password('old_password'); #returns false

Note: The component needs to be loaded before Core and other components such as Timestamp. Core should always be last.

   E.g:
   __PACKAGE__->load_components(qw/EncodedColumn TimeStamp Core/);

DESCRIPTION

This DBIx::Class component can be used to automatically encode a column's contents whenever the value of that column is set.

This module is similar to the existing DBIx::Class::DigestColumns, but there is some key differences:

"DigestColumns" performs the encode operation on "insert" and "update", and "EncodedColumn" performs the operation when the value is set, or on "new".
"DigestColumns" supports only algorithms of the Digest family. "EncodedColumn" employs a set of thin wrappers around different cipher modules to provide support for any cipher you wish to use and wrappers are very simple to write (typically less than 30 lines).
"EncodedColumn" supports having more than one encoded column per table and each column can use a different cipher.
"Encode" adds only one item to the namespace of the object utilizing it ("_column_encoders").

There is, unfortunately, some features that "EncodedColumn" doesn't support. "DigestColumns" supports changing certain options at runtime, as well as the option to not automatically encode values on set. The author of this module found these options to be non-essential and omitted them by design.

Options added to add_column

encode_column => 1

Enable automatic encoding of column values. If this option is not set to true any other options will become no-ops.

encode_check_method => $method_name

By using the encode_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, and returns a boolean that indicates whether the digest of the provided value matches the current value.

encode_class

The class to use for encoding. Available classes are:

"Crypt::Eksblowfish::Bcrypt" - uses DBIx::Class::EncodedColumn::Crypt::Eksblowfish::Bcrypt and requires Crypt::Eksblowfish::Bcrypt to be installed
"Digest" - uses DBIx::Class::EncodedColumn::Digest requires Digest to be installed as well as the algorithm required (Digest::SHA, Digest::Whirlpool, etc)
"Crypt::OpenPGP" - DBIx::Class::EncodedColumn::Crypt::OpenPGP and requires Crypt::OpenPGP to be installed

Please see the relevant class's documentation for information about the specific arguments accepted by each and make sure you include the encoding algorithm (e.g. Crypt::OpenPGP) in your application's requirements.

EXTENDED METHODS

The following DBIx::Class::ResultSource method is extended:

register_column - Handle the options described above.

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

new - Encode the columns on new() so that copy and create DWIM.
set_column - Encode values whenever column is set.

AUTHOR

Guillermo Roditi (groditi) <groditi@cpan.org>

Inspired by the original module written by Tom Kirkpatrick (tkp) <tkp@cpan.org> featuring contributions from Guillermo Roditi (groditi) <groditi@cpan.org> and Marc Mims <marc@questright.com>

CONTRIBUTORS

jshirley - J. Shirley <cpan@coldhardcode.com>

kentnl - Kent Fredric <kentnl@cpan.org>

mst - Matt S Trout <mst@shadowcat.co.uk>

wreis - Wallace reis <wreis@cpan.org>

COPYRIGHT

LICENSE

This library is free software and may be distributed under the same terms as perl itself.