=head1 NAME

Mozilla::Persona::Validate::Table - validate the existence via a simple table

=head1 INHERITANCE

 Mozilla::Persona::Validate::Table
   is a Mozilla::Persona::Validate

=head1 SYNOPSIS

  # add to the configation of $domain.json
  { ...
    "validate" : {
      "class"  : "Mozilla::Persona::Validator::Table",
      "pwfile" : "/etc/persona/passwords",
      "domain" : "example.com",
    },
    ...
  }

=head1 DESCRIPTION

The validator object must ensure that the user/password combination
is valid.  In this case, a simple password-file-like table is used
to authenticate the user.

You may put that file with the other configuration information
in F</etc/persona/>, for instance under the name C<passwords>.  This
is the default when you run C<persona setup>.

=head2 Password file syntax

Lines which are blank (visually empty) or start with a '#' (comment)
are ignored.  Other lines describe users.

The user definition lines contain (currently) three fields separated by a
colon ':'.  First a username, than the digest algorithm used (acceptable
to Digest, you may need to install additional Digest modules) and
finally the base64 encoded version of that digest.  The username may
either include the domain, or the domain must be set in the configuration.

Example of two lines in the C<passwords> file:

  # my test user
  test@example.com:MD5:47b0eb54a2f09e1b97881eb8746486ce

With "domain" set to "example.com", your usernames become easier

  test:MD5:47b0eb54a2f09e1b97881eb8746486ce

You may still use full usernames if you want.  Full usernames which
are in an other domain are silently dropped.

B<Be warned> that md5sum produces hex, where we need base64 here.
Other scripts output base64 directly, for instance F<sha256sum>.  You
may use that to produce the third field of a user defining line:

  echo -n "my-password" | sha256sum
  echo "my-password\c"  | sha256sum

=head1 METHODS

=head2 Constructors

=over 4

=item Mozilla::Persona::Validate::Table-E<gt>B<new>(OPTIONS)

 -Option--Default
  domain  undef
  pwfile  <required>

=over 2

=item domain => DOMAIN

Default domain for all users in the file.

=item pwfile => FILENAME

The password file.  Probably, you want to provide an absolute path.
When the file changes, it will automatically be reloaded.

=back

=back

=head2 Validation

=over 4

=item $obj-E<gt>B<isValid>(USER, PASSWORD)

See L<Mozilla::Persona::Validate/"Validation">

=back

=head2 Accessors

=over 4

=item $obj-E<gt>B<domain>()

=item $obj-E<gt>B<pwfile>()

=back

=head1 SEE ALSO

This module is part of Mozilla-Persona distribution version 0.12,
built on November 22, 2012. Website: F<http://perl.overmeer.net>.  The code is based on the MulkyID code by
Matthias Benkard.

Persona is described at F<http://www.mozilla.org/persona/>

=head1 COPYRIGHTS

Copyrights of the perl code and the related documentation by
2012 by [Mark Overmeer]. For other contributors see ChangeLog.

This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
See F<http://www.perl.com/perl/misc/Artistic.html>