use 5.006;
use strict;
use warnings;
package CPAN::Meta::Validator;
our $VERSION = '2.120921'; # VERSION


#--------------------------------------------------------------------------#
# This code copied and adapted from Test::CPAN::Meta
# by Barbie, <[email protected]> for Miss Barbell Productions,
# L<http://www.missbarbell.co.uk>
#--------------------------------------------------------------------------#

#--------------------------------------------------------------------------#
# Specification Definitions
#--------------------------------------------------------------------------#

my %known_specs = (
'1.4' => 'http://module-build.sourceforge.net/META-spec-v1.4.html',
'1.3' => 'http://module-build.sourceforge.net/META-spec-v1.3.html',
'1.2' => 'http://module-build.sourceforge.net/META-spec-v1.2.html',
'1.1' => 'http://module-build.sourceforge.net/META-spec-v1.1.html',
'1.0' => 'http://module-build.sourceforge.net/META-spec-v1.0.html'
);
my %known_urls = map {$known_specs{$_} => $_} keys %known_specs;

my $module_map1 = { 'map' => { ':key' => { name => \&module, value => \&exversion } } };

my $module_map2 = { 'map' => { ':key' => { name => \&module, value => \&version } } };

my $no_index_2 = {
'map' => { file => { list => { value => \&string } },
directory => { list => { value => \&string } },
'package' => { list => { value => \&string } },
namespace => { list => { value => \&string } },
':key' => { name => \&custom_2, value => \&anything },
}
};

my $no_index_1_3 = {
'map' => { file => { list => { value => \&string } },
directory => { list => { value => \&string } },
'package' => { list => { value => \&string } },
namespace => { list => { value => \&string } },
':key' => { name => \&string, value => \&anything },
}
};

my $no_index_1_2 = {
'map' => { file => { list => { value => \&string } },
dir => { list => { value => \&string } },
'package' => { list => { value => \&string } },
namespace => { list => { value => \&string } },
':key' => { name => \&string, value => \&anything },
}
};

my $no_index_1_1 = {
'map' => { ':key' => { name => \&string, list => { value => \&string } },
}
};

my $prereq_map = {
map => {
':key' => {
name => \&phase,
'map' => {
':key' => {
name => \&relation,
%$module_map1,
},
},
}
},
};

my %definitions = (
'2' => {
# REQUIRED
'abstract' => { mandatory => 1, value => \&string },
'author' => { mandatory => 1, lazylist => { value => \&string } },
'dynamic_config' => { mandatory => 1, value => \&boolean },
'generated_by' => { mandatory => 1, value => \&string },
'license' => { mandatory => 1, lazylist => { value => \&license } },
'meta-spec' => {
mandatory => 1,
'map' => {
version => { mandatory => 1, value => \&version},
url => { value => \&url },
':key' => { name => \&custom_2, value => \&anything },
}
},
'name' => { mandatory => 1, value => \&string },
'release_status' => { mandatory => 1, value => \&release_status },
'version' => { mandatory => 1, value => \&version },

# OPTIONAL
'description' => { value => \&string },
'keywords' => { lazylist => { value => \&string } },
'no_index' => $no_index_2,
'optional_features' => {
'map' => {
':key' => {
name => \&string,
'map' => {
description => { value => \&string },
prereqs => $prereq_map,
':key' => { name => \&custom_2, value => \&anything },
}
}
}
},
'prereqs' => $prereq_map,
'provides' => {
'map' => {
':key' => {
name => \&module,
'map' => {
file => { mandatory => 1, value => \&file },
version => { value => \&version },
':key' => { name => \&custom_2, value => \&anything },
}
}
}
},
'resources' => {
'map' => {
license => { lazylist => { value => \&url } },
homepage => { value => \&url },
bugtracker => {
'map' => {
web => { value => \&url },
mailto => { value => \&string},
':key' => { name => \&custom_2, value => \&anything },
}
},
repository => {
'map' => {
web => { value => \&url },
url => { value => \&url },
type => { value => \&string },
':key' => { name => \&custom_2, value => \&anything },
}
},
':key' => { value => \&string, name => \&custom_2 },
}
},

# CUSTOM -- additional user defined key/value pairs
# note we can only validate the key name, as the structure is user defined
':key' => { name => \&custom_2, value => \&anything },
},

'1.4' => {
'meta-spec' => {
mandatory => 1,
'map' => {
version => { mandatory => 1, value => \&version},
url => { mandatory => 1, value => \&urlspec },
':key' => { name => \&string, value => \&anything },
},
},

'name' => { mandatory => 1, value => \&string },
'version' => { mandatory => 1, value => \&version },
'abstract' => { mandatory => 1, value => \&string },
'author' => { mandatory => 1, list => { value => \&string } },
'license' => { mandatory => 1, value => \&license },
'generated_by' => { mandatory => 1, value => \&string },

'distribution_type' => { value => \&string },
'dynamic_config' => { value => \&boolean },

'requires' => $module_map1,
'recommends' => $module_map1,
'build_requires' => $module_map1,
'configure_requires' => $module_map1,
'conflicts' => $module_map2,

'optional_features' => {
'map' => {
':key' => { name => \&string,
'map' => { description => { value => \&string },
requires => $module_map1,
recommends => $module_map1,
build_requires => $module_map1,
conflicts => $module_map2,
':key' => { name => \&string, value => \&anything },
}
}
}
},

'provides' => {
'map' => {
':key' => { name => \&module,
'map' => {
file => { mandatory => 1, value => \&file },
version => { value => \&version },
':key' => { name => \&string, value => \&anything },
}
}
}
},

'no_index' => $no_index_1_3,
'private' => $no_index_1_3,

'keywords' => { list => { value => \&string } },

'resources' => {
'map' => { license => { value => \&url },
homepage => { value => \&url },
bugtracker => { value => \&url },
repository => { value => \&url },
':key' => { value => \&string, name => \&custom_1 },
}
},

# additional user defined key/value pairs
# note we can only validate the key name, as the structure is user defined
':key' => { name => \&string, value => \&anything },
},

'1.3' => {
'meta-spec' => {
mandatory => 1,
'map' => {
version => { mandatory => 1, value => \&version},
url => { mandatory => 1, value => \&urlspec },
':key' => { name => \&string, value => \&anything },
},
},

'name' => { mandatory => 1, value => \&string },
'version' => { mandatory => 1, value => \&version },
'abstract' => { mandatory => 1, value => \&string },
'author' => { mandatory => 1, list => { value => \&string } },
'license' => { mandatory => 1, value => \&license },
'generated_by' => { mandatory => 1, value => \&string },

'distribution_type' => { value => \&string },
'dynamic_config' => { value => \&boolean },

'requires' => $module_map1,
'recommends' => $module_map1,
'build_requires' => $module_map1,
'conflicts' => $module_map2,

'optional_features' => {
'map' => {
':key' => { name => \&string,
'map' => { description => { value => \&string },
requires => $module_map1,
recommends => $module_map1,
build_requires => $module_map1,
conflicts => $module_map2,
':key' => { name => \&string, value => \&anything },
}
}
}
},

'provides' => {
'map' => {
':key' => { name => \&module,
'map' => {
file => { mandatory => 1, value => \&file },
version => { value => \&version },
':key' => { name => \&string, value => \&anything },
}
}
}
},


'no_index' => $no_index_1_3,
'private' => $no_index_1_3,

'keywords' => { list => { value => \&string } },

'resources' => {
'map' => { license => { value => \&url },
homepage => { value => \&url },
bugtracker => { value => \&url },
repository => { value => \&url },
':key' => { value => \&string, name => \&custom_1 },
}
},

# additional user defined key/value pairs
# note we can only validate the key name, as the structure is user defined
':key' => { name => \&string, value => \&anything },
},

# v1.2 is misleading, it seems to assume that a number of fields where created
# within v1.1, when they were created within v1.2. This may have been an
# original mistake, and that a v1.1 was retro fitted into the timeline, when
# v1.2 was originally slated as v1.1. But I could be wrong ;)
'1.2' => {
'meta-spec' => {
mandatory => 1,
'map' => {
version => { mandatory => 1, value => \&version},
url => { mandatory => 1, value => \&urlspec },
':key' => { name => \&string, value => \&anything },
},
},


'name' => { mandatory => 1, value => \&string },
'version' => { mandatory => 1, value => \&version },
'license' => { mandatory => 1, value => \&license },
'generated_by' => { mandatory => 1, value => \&string },
'author' => { mandatory => 1, list => { value => \&string } },
'abstract' => { mandatory => 1, value => \&string },

'distribution_type' => { value => \&string },
'dynamic_config' => { value => \&boolean },

'keywords' => { list => { value => \&string } },

'private' => $no_index_1_2,
'$no_index' => $no_index_1_2,

'requires' => $module_map1,
'recommends' => $module_map1,
'build_requires' => $module_map1,
'conflicts' => $module_map2,

'optional_features' => {
'map' => {
':key' => { name => \&string,
'map' => { description => { value => \&string },
requires => $module_map1,
recommends => $module_map1,
build_requires => $module_map1,
conflicts => $module_map2,
':key' => { name => \&string, value => \&anything },
}
}
}
},

'provides' => {
'map' => {
':key' => { name => \&module,
'map' => {
file => { mandatory => 1, value => \&file },
version => { value => \&version },
':key' => { name => \&string, value => \&anything },
}
}
}
},

'resources' => {
'map' => { license => { value => \&url },
homepage => { value => \&url },
bugtracker => { value => \&url },
repository => { value => \&url },
':key' => { value => \&string, name => \&custom_1 },
}
},

# additional user defined key/value pairs
# note we can only validate the key name, as the structure is user defined
':key' => { name => \&string, value => \&anything },
},

# note that the 1.1 spec only specifies 'version' as mandatory
'1.1' => {
'name' => { value => \&string },
'version' => { mandatory => 1, value => \&version },
'license' => { value => \&license },
'generated_by' => { value => \&string },

'license_uri' => { value => \&url },
'distribution_type' => { value => \&string },
'dynamic_config' => { value => \&boolean },

'private' => $no_index_1_1,

'requires' => $module_map1,
'recommends' => $module_map1,
'build_requires' => $module_map1,
'conflicts' => $module_map2,

# additional user defined key/value pairs
# note we can only validate the key name, as the structure is user defined
':key' => { name => \&string, value => \&anything },
},

# note that the 1.0 spec doesn't specify optional or mandatory fields
# but we will treat version as mandatory since otherwise META 1.0 is
# completely arbitrary and pointless
'1.0' => {
'name' => { value => \&string },
'version' => { mandatory => 1, value => \&version },
'license' => { value => \&license },
'generated_by' => { value => \&string },

'license_uri' => { value => \&url },
'distribution_type' => { value => \&string },
'dynamic_config' => { value => \&boolean },

'requires' => $module_map1,
'recommends' => $module_map1,
'build_requires' => $module_map1,
'conflicts' => $module_map2,

# additional user defined key/value pairs
# note we can only validate the key name, as the structure is user defined
':key' => { name => \&string, value => \&anything },
},
);

#--------------------------------------------------------------------------#
# Code
#--------------------------------------------------------------------------#


sub new {
my ($class,$data) = @_;

# create an attributes hash
my $self = {
'data' => $data,
'spec' => $data->{'meta-spec'}{'version'} || "1.0",
'errors' => undef,
};

# create the object
return bless $self, $class;
}


sub is_valid {
my $self = shift;
my $data = $self->{data};
my $spec_version = $self->{spec};
$self->check_map($definitions{$spec_version},$data);
return ! $self->errors;
}


sub errors {
my $self = shift;
return () unless(defined $self->{errors});
return @{$self->{errors}};
}


my $spec_error = "Missing validation action in specification. "
. "Must be one of 'map', 'list', 'lazylist', or 'value'";

sub check_map {
my ($self,$spec,$data) = @_;

if(ref($spec) ne 'HASH') {
$self->_error( "Unknown META specification, cannot validate." );
return;
}

if(ref($data) ne 'HASH') {
$self->_error( "Expected a map structure from string or file." );
return;
}

for my $key (keys %$spec) {
next unless($spec->{$key}->{mandatory});
next if(defined $data->{$key});
push @{$self->{stack}}, $key;
$self->_error( "Missing mandatory field, '$key'" );
pop @{$self->{stack}};
}

for my $key (keys %$data) {
push @{$self->{stack}}, $key;
if($spec->{$key}) {
if($spec->{$key}{value}) {
$spec->{$key}{value}->($self,$key,$data->{$key});
} elsif($spec->{$key}{'map'}) {
$self->check_map($spec->{$key}{'map'},$data->{$key});
} elsif($spec->{$key}{'list'}) {
$self->check_list($spec->{$key}{'list'},$data->{$key});
} elsif($spec->{$key}{'lazylist'}) {
$self->check_lazylist($spec->{$key}{'lazylist'},$data->{$key});
} else {
$self->_error( "$spec_error for '$key'" );
}

} elsif ($spec->{':key'}) {
$spec->{':key'}{name}->($self,$key,$key);
if($spec->{':key'}{value}) {
$spec->{':key'}{value}->($self,$key,$data->{$key});
} elsif($spec->{':key'}{'map'}) {
$self->check_map($spec->{':key'}{'map'},$data->{$key});
} elsif($spec->{':key'}{'list'}) {
$self->check_list($spec->{':key'}{'list'},$data->{$key});
} elsif($spec->{':key'}{'lazylist'}) {
$self->check_lazylist($spec->{':key'}{'lazylist'},$data->{$key});
} else {
$self->_error( "$spec_error for ':key'" );
}


} else {
$self->_error( "Unknown key, '$key', found in map structure" );
}
pop @{$self->{stack}};
}
}

# if it's a string, make it into a list and check the list
sub check_lazylist {
my ($self,$spec,$data) = @_;

if ( defined $data && ! ref($data) ) {
$data = [ $data ];
}

$self->check_list($spec,$data);
}

sub check_list {
my ($self,$spec,$data) = @_;

if(ref($data) ne 'ARRAY') {
$self->_error( "Expected a list structure" );
return;
}

if(defined $spec->{mandatory}) {
if(!defined $data->[0]) {
$self->_error( "Missing entries from mandatory list" );
}
}

for my $value (@$data) {
push @{$self->{stack}}, $value || "<undef>";
if(defined $spec->{value}) {
$spec->{value}->($self,'list',$value);
} elsif(defined $spec->{'map'}) {
$self->check_map($spec->{'map'},$value);
} elsif(defined $spec->{'list'}) {
$self->check_list($spec->{'list'},$value);
} elsif(defined $spec->{'lazylist'}) {
$self->check_lazylist($spec->{'lazylist'},$value);
} elsif ($spec->{':key'}) {
$self->check_map($spec,$value);
} else {
$self->_error( "$spec_error associated with '$self->{stack}[-2]'" );
}
pop @{$self->{stack}};
}
}


sub header {
my ($self,$key,$value) = @_;
if(defined $value) {
return 1 if($value && $value =~ /^--- #YAML:1.0/);
}
$self->_error( "file does not have a valid YAML header." );
return 0;
}

sub release_status {
my ($self,$key,$value) = @_;
if(defined $value) {
my $version = $self->{data}{version} || '';
if ( $version =~ /_/ ) {
return 1 if ( $value =~ /\A(?:testing|unstable)\z/ );
$self->_error( "'$value' for '$key' is invalid for version '$version'" );
}
else {
return 1 if ( $value =~ /\A(?:stable|testing|unstable)\z/ );
$self->_error( "'$value' for '$key' is invalid" );
}
}
else {
$self->_error( "'$key' is not defined" );
}
return 0;
}

# _uri_split taken from URI::Split by Gisle Aas, Copyright 2003
sub _uri_split {
return $_[0] =~ m,(?:([^:/?#]+):)?(?://([^/?#]*))?([^?#]*)(?:\?([^#]*))?(?:#(.*))?,;
}

sub url {
my ($self,$key,$value) = @_;
if(defined $value) {
my ($scheme, $auth, $path, $query, $frag) = _uri_split($value);
unless ( defined $scheme && length $scheme ) {
$self->_error( "'$value' for '$key' does not have a URL scheme" );
return 0;
}
unless ( defined $auth && length $auth ) {
$self->_error( "'$value' for '$key' does not have a URL authority" );
return 0;
}
return 1;
}
$value ||= '';
$self->_error( "'$value' for '$key' is not a valid URL." );
return 0;
}

sub urlspec {
my ($self,$key,$value) = @_;
if(defined $value) {
return 1 if($value && $known_specs{$self->{spec}} eq $value);
if($value && $known_urls{$value}) {
$self->_error( 'META specification URL does not match version' );
return 0;
}
}
$self->_error( 'Unknown META specification' );
return 0;
}

sub anything { return 1 }

sub string {
my ($self,$key,$value) = @_;
if(defined $value) {
return 1 if($value || $value =~ /^0$/);
}
$self->_error( "value is an undefined string" );
return 0;
}

sub string_or_undef {
my ($self,$key,$value) = @_;
return 1 unless(defined $value);
return 1 if($value || $value =~ /^0$/);
$self->_error( "No string defined for '$key'" );
return 0;
}

sub file {
my ($self,$key,$value) = @_;
return 1 if(defined $value);
$self->_error( "No file defined for '$key'" );
return 0;
}

sub exversion {
my ($self,$key,$value) = @_;
if(defined $value && ($value || $value =~ /0/)) {
my $pass = 1;
for(split(",",$value)) { $self->version($key,$_) or ($pass = 0); }
return $pass;
}
$value = '<undef>' unless(defined $value);
$self->_error( "'$value' for '$key' is not a valid version." );
return 0;
}

sub version {
my ($self,$key,$value) = @_;
if(defined $value) {
return 0 unless($value || $value =~ /0/);
return 1 if($value =~ /^\s*((<|<=|>=|>|!=|==)\s*)?v?\d+((\.\d+((_|\.)\d+)?)?)/);
} else {
$value = '<undef>';
}
$self->_error( "'$value' for '$key' is not a valid version." );
return 0;
}

sub boolean {
my ($self,$key,$value) = @_;
if(defined $value) {
return 1 if($value =~ /^(0|1|true|false)$/);
} else {
$value = '<undef>';
}
$self->_error( "'$value' for '$key' is not a boolean value." );
return 0;
}

my %v1_licenses = (
'perl' => 'http://dev.perl.org/licenses/',
'gpl' => 'http://www.opensource.org/licenses/gpl-license.php',
'apache' => 'http://apache.org/licenses/LICENSE-2.0',
'artistic' => 'http://opensource.org/licenses/artistic-license.php',
'artistic_2' => 'http://opensource.org/licenses/artistic-license-2.0.php',
'lgpl' => 'http://www.opensource.org/licenses/lgpl-license.php',
'bsd' => 'http://www.opensource.org/licenses/bsd-license.php',
'gpl' => 'http://www.opensource.org/licenses/gpl-license.php',
'mit' => 'http://opensource.org/licenses/mit-license.php',
'mozilla' => 'http://opensource.org/licenses/mozilla1.1.php',
'open_source' => undef,
'unrestricted' => undef,
'restrictive' => undef,
'unknown' => undef,
);

my %v2_licenses = map { $_ => 1 } qw(
agpl_3
apache_1_1
apache_2_0
artistic_1
artistic_2
bsd
freebsd
gfdl_1_2
gfdl_1_3
gpl_1
gpl_2
gpl_3
lgpl_2_1
lgpl_3_0
mit
mozilla_1_0
mozilla_1_1
openssl
perl_5
qpl_1_0
ssleay
sun
zlib
open_source
restricted
unrestricted
unknown
);

sub license {
my ($self,$key,$value) = @_;
my $licenses = $self->{spec} < 2 ? \%v1_licenses : \%v2_licenses;
if(defined $value) {
return 1 if($value && exists $licenses->{$value});
} else {
$value = '<undef>';
}
$self->_error( "License '$value' is invalid" );
return 0;
}

sub custom_1 {
my ($self,$key) = @_;
if(defined $key) {
# a valid user defined key should be alphabetic
# and contain at least one capital case letter.
return 1 if($key && $key =~ /^[_a-z]+$/i && $key =~ /[A-Z]/);
} else {
$key = '<undef>';
}
$self->_error( "Custom resource '$key' must be in CamelCase." );
return 0;
}

sub custom_2 {
my ($self,$key) = @_;
if(defined $key) {
return 1 if($key && $key =~ /^x_/i); # user defined
} else {
$key = '<undef>';
}
$self->_error( "Custom key '$key' must begin with 'x_' or 'X_'." );
return 0;
}

sub identifier {
my ($self,$key) = @_;
if(defined $key) {
return 1 if($key && $key =~ /^([a-z][_a-z]+)$/i); # spec 2.0 defined
} else {
$key = '<undef>';
}
$self->_error( "Key '$key' is not a legal identifier." );
return 0;
}

sub module {
my ($self,$key) = @_;
if(defined $key) {
return 1 if($key && $key =~ /^[A-Za-z0-9_]+(::[A-Za-z0-9_]+)*$/);
} else {
$key = '<undef>';
}
$self->_error( "Key '$key' is not a legal module name." );
return 0;
}

my @valid_phases = qw/ configure build test runtime develop /;
sub phase {
my ($self,$key) = @_;
if(defined $key) {
return 1 if( length $key && grep { $key eq $_ } @valid_phases );
return 1 if $key =~ /x_/i;
} else {
$key = '<undef>';
}
$self->_error( "Key '$key' is not a legal phase." );
return 0;
}

my @valid_relations = qw/ requires recommends suggests conflicts /;
sub relation {
my ($self,$key) = @_;
if(defined $key) {
return 1 if( length $key && grep { $key eq $_ } @valid_relations );
return 1 if $key =~ /x_/i;
} else {
$key = '<undef>';
}
$self->_error( "Key '$key' is not a legal prereq relationship." );
return 0;
}

sub _error {
my $self = shift;
my $mess = shift;

$mess .= ' ('.join(' -> ',@{$self->{stack}}).')' if($self->{stack});
$mess .= " [Validation: $self->{spec}]";

push @{$self->{errors}}, $mess;
}

1;

# ABSTRACT: validate CPAN distribution metadata structures



=pod

=head1 NAME

CPAN::Meta::Validator - validate CPAN distribution metadata structures

=head1 VERSION

version 2.120921

=head1 SYNOPSIS

my $struct = decode_json_file('META.json');

my $cmv = CPAN::Meta::Validator->new( $struct );

unless ( $cmv->is_valid ) {
my $msg = "Invalid META structure. Errors found:\n";
$msg .= join( "\n", $cmv->errors );
die $msg;
}

=head1 DESCRIPTION

This module validates a CPAN Meta structure against the version of the
the specification claimed in the C<meta-spec> field of the structure.

=head1 METHODS

=head2 new

my $cmv = CPAN::Meta::Validator->new( $struct )

The constructor must be passed a metadata structure.

=head2 is_valid

if ( $cmv->is_valid ) {
...
}

Returns a boolean value indicating whether the metadata provided
is valid.

=head2 errors

warn( join "\n", $cmv->errors );

Returns a list of errors seen during validation.

=begin :internals

=head2 Check Methods

=over

=item *

check_map($spec,$data)

Checks whether a map (or hash) part of the data structure conforms to the
appropriate specification definition.

=item *

check_list($spec,$data)

Checks whether a list (or array) part of the data structure conforms to
the appropriate specification definition.

=item *

check_lazylist($spec,$data)

Checks whether a list conforms, but converts strings to a single-element list

=back

=head2 Validator Methods

=over

=item *

header($self,$key,$value)

Validates that the header is valid.

Note: No longer used as we now read the data structure, not the file.

=item *

url($self,$key,$value)

Validates that a given value is in an acceptable URL format

=item *

urlspec($self,$key,$value)

Validates that the URL to a META specification is a known one.

=item *

string_or_undef($self,$key,$value)

Validates that the value is either a string or an undef value. Bit of a
catchall function for parts of the data structure that are completely user
defined.

=item *

string($self,$key,$value)

Validates that a string exists for the given key.

=item *

file($self,$key,$value)

Validate that a file is passed for the given key. This may be made more
thorough in the future. For now it acts like \&string.

=item *

exversion($self,$key,$value)

Validates a list of versions, e.g. '<= 5, >=2, ==3, !=4, >1, <6, 0'.

=item *

version($self,$key,$value)

Validates a single version string. Versions of the type '5.8.8' and '0.00_00'
are both valid. A leading 'v' like 'v1.2.3' is also valid.

=item *

boolean($self,$key,$value)

Validates for a boolean value. Currently these values are '1', '0', 'true',
'false', however the latter 2 may be removed.

=item *

license($self,$key,$value)

Validates that a value is given for the license. Returns 1 if an known license
type, or 2 if a value is given but the license type is not a recommended one.

=item *

custom_1($self,$key,$value)

Validates that the given key is in CamelCase, to indicate a user defined
keyword and only has characters in the class [-_a-zA-Z]. In version 1.X
of the spec, this was only explicitly stated for 'resources'.

=item *

custom_2($self,$key,$value)

Validates that the given key begins with 'x_' or 'X_', to indicate a user
defined keyword and only has characters in the class [-_a-zA-Z]

=item *

identifier($self,$key,$value)

Validates that key is in an acceptable format for the META specification,
for an identifier, i.e. any that matches the regular expression
qr/[a-z][a-z_]/i.

=item *

module($self,$key,$value)

Validates that a given key is in an acceptable module name format, e.g.
'Test::CPAN::Meta::Version'.

=back

=end :internals

=for Pod::Coverage anything boolean check_lazylist check_list custom_1 custom_2 exversion file
identifier license module phase relation release_status string string_or_undef
url urlspec version header check_map

=head1 BUGS

Please report any bugs or feature using the CPAN Request Tracker.
Bugs can be submitted through the web interface at
L<http://rt.cpan.org/Dist/Display.html?Queue=CPAN-Meta>

When submitting a bug or request, please include a test-file or a patch to an
existing test-file that illustrates the bug or desired feature.

=head1 AUTHORS

=over 4

=item *

David Golden <[email protected]>

=item *

Ricardo Signes <[email protected]>

=back

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2010 by David Golden and Ricardo Signes.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=cut


__END__