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package URI::URL::data;
# Implements data:-URLs as specified in draft-masinter-url-data-02.txt
#
# Abstract
#
# A new URL scheme, "data", is defined. It allows inclusion of small
# data items as "immediate" data, as if it had been included externally.
#
# Description
#
# Some applications that use URLs also have a need to embed (small)
# media type data directly inline. This document defines a new URL
# scheme that would work like 'immediate addressing'. The URLs are of
# the form:
#
# data:[<mediatype>][;base64],<data>
#
require URI::URL;
@ISA = qw(URI::URL);
use URI::Escape;
use MIME::Base64 ();
# as defined in rfc1522.txt
my $tspecial = qq(()<>@,;:/[]?.=);
my $tokenchar = qq([^\\s\000-\037\177-\377\Q$tspecial\E]);
sub new {
my($class, $init, $base) = @_;
my $self = bless { }, $class;
$self->{'scheme'} = lc($1) if $init =~ s/^\s*([\w\+\.\-]+)://;
$self->{'frag'} = $1 if $init =~ s/\#(.*)$//;
my $type = "";
if ($init =~ s/^($tokenchar+\/$tokenchar+)//o) {
$type = $1;
}
while ($init =~ s/^;($tokenchar+)=([^,;]*)//o) {
# XXX should we unescape the parst
$type .= ";$1=$2";
}
$self->{'media_type'} = $type;
my $base64;
if ($init =~ s/^;base64//i) {
$base64 = 1;
}
$init =~ s/^,//;
if ($base64) {
$self->{'base64'} = uri_unescape($init);
} else {
$self->{'data'} = uri_unescape($init);
}
$self->base($base) if $base;
$self;
}
sub media_type
{
my $self = shift;
my $old = $self->{'media_type'};
if (@_) {
$self->{'media_type'} = shift || "";
delete $self->{'_str'};
}
my($type, $param) = split(/;/, $old, 2);
if ($type) {
$type = lc $type;
} else {
$type = "text/plain";
$param = "charset=US-ASCII" unless $param;
}
if (wantarray) {
return ($type, $param);
} else {
return $type;
}
}
sub data
{
my $self = shift;
my $old_data;
my $old_base64;
$old_data = $self->{'data'};
$old_base64 = $self->{'base64'};
if (@_) {
if ($_[1]) { # base64 flag
$self->{'base64'} = $_[0];
delete $self->{'data'};
} else {
$self->{'data'} = $_[0];
delete $self->{'base64'};
}
delete $self->{'_str'};
}
unless (defined $old_data) {
$old_data = MIME::Base64::decode($old_base64);
$self->{'data'} = $old_data unless @_;
}
$old_data;
}
sub crack
{
my $self = shift;
($self->{'scheme'}
|| 'data', # scheme
undef, # user
undef, # passwd
undef, # host
undef, # port
$self->data, # path
$self->{'media_type'}, # params
undef, # query
$self->{'frag'} # fragment
)
}
sub as_string {
my $self = shift;
return $self->{'_str'} if $self->{'_str'};
my $str = ($self->{'scheme'} || 'data') . ":";
$str .= $self->{'media_type'};
if (defined $self->{'base64'}) {
$str .= ";base64,$self->{'base64'}";
} else {
my $urlenc = uri_escape($self->{'data'});
my $base64 = MIME::Base64::encode($self->{'data'});
if (length($base64) + 7 < length($urlenc)) {
$str .= ";base64,$base64";
$self->{'base64'} = $base64;
} else {
$str .= ",$urlenc";
}
}
$self->{'_str'} = $str;
}
sub eq {
my($self, $other) = @_;
return 0 if ref($self) ne ref($other);
return 0 if $self->scheme ne $other->scheme;
my $mt1 = join(";", $self->media_type);
my $mt2 = join(";", $other->media_type);
return 0 if $mt1 ne $mt2;
$self->data eq $other->data;
}
1;
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