NAME
    DBIx::Class::DigestColumns - Automatic digest columns

SYNOPSIS
    In your DBIx::Class table class:

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

      __PACKAGE__->digestcolumns(
          columns   => [qw/ password /],
          algorithm => 'MD5',
          encoding  => 'base64',
          auto      => 1,
      );

    Note: 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_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');

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

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

  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".

  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.

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>

LICENSE
    You may distribute this code under the same terms as Perl itself.