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Edit File : ETag.pm \| Size : 2.50 KB
package HTTP::Headers::ETag; use strict; use warnings; our $VERSION = '6.18'; require HTTP::Date; require HTTP::Headers; package HTTP::Headers; sub _etags { my $self = shift; my $header = shift; my @old = _split_etag_list($self->_header($header)); if (@_) { $self->_header($header => join(", ", _split_etag_list(@_))); } wantarray ? @old : join(", ", @old); } sub etag { shift->_etags("ETag", @_); } sub if_match { shift->_etags("If-Match", @_); } sub if_none_match { shift->_etags("If-None-Match", @_); } sub if_range { # Either a date or an entity-tag my $self = shift; my @old = $self->_header("If-Range"); if (@_) { my $new = shift; if (!defined $new) { $self->remove_header("If-Range"); } elsif ($new =~ /^\d+$/) { $self->_date_header("If-Range", $new); } else { $self->_etags("If-Range", $new); } } return unless defined(wantarray); for (@old) { my $t = HTTP::Date::str2time($_); $_ = $t if $t; } wantarray ? @old : join(", ", @old); } # Split a list of entity tag values. The return value is a list # consisting of one element per entity tag. Suitable for parsing # headers like C<If-Match>, C<If-None-Match>. You might even want to # use it on C<ETag> and C<If-Range> entity tag values, because it will # normalize them to the common form. # # entity-tag = [ weak ] opaque-tag # weak = "W/" # opaque-tag = quoted-string sub _split_etag_list { my(@val) = @_; my @res; for (@val) { while (length) { my $weak = ""; $weak = "W/" if s,^\s[wW]/,,; my $etag = ""; if (s/^\s(\"[^\"\\](?:\\.[^\"\\])\")//) { push(@res, "$weak$1"); } elsif (s/^\s,//) { push(@res, qq(W/"")) if $weak; } elsif (s/^\s*([^,\s]+)//) { $etag = $1; $etag =~ s/([\"\\])/\\$1/g; push(@res, qq($weak"$etag")); } elsif (s/^\s+// \|\| !length) { push(@res, qq(W/"")) if $weak; } else { die "This should not happen: '$_'"; } } } @res; } 1; __END__ =pod =encoding UTF-8 =head1 NAME HTTP::Headers::ETag =head1 VERSION version 6.18 =head1 AUTHOR Gisle Aas <gisle@activestate.com> =head1 COPYRIGHT AND LICENSE This software is copyright (c) 1994-2017 by Gisle Aas. 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 Back

Edit File : ETag.pm | Size : 2.50 KB

package HTTP::Headers::ETag;

use strict;
use warnings;

our $VERSION = '6.18';

require HTTP::Date;

require HTTP::Headers;
package
    HTTP::Headers;

sub _etags
{
    my $self = shift;
    my $header = shift;
    my @old = _split_etag_list($self->_header($header));
    if (@_) {
	$self->_header($header => join(", ", _split_etag_list(@_)));
    }
    wantarray ? @old : join(", ", @old);
}

sub etag          { shift->_etags("ETag", @_); }
sub if_match      { shift->_etags("If-Match", @_); }
sub if_none_match { shift->_etags("If-None-Match", @_); }

sub if_range {
    # Either a date or an entity-tag
    my $self = shift;
    my @old = $self->_header("If-Range");
    if (@_) {
	my $new = shift;
	if (!defined $new) {
	    $self->remove_header("If-Range");
	}
	elsif ($new =~ /^\d+$/) {
	    $self->_date_header("If-Range", $new);
	}
	else {
	    $self->_etags("If-Range", $new);
	}
    }
    return unless defined(wantarray);
    for (@old) {
	my $t = HTTP::Date::str2time($_);
	$_ = $t if $t;
    }
    wantarray ? @old : join(", ", @old);
}

# Split a list of entity tag values.  The return value is a list
# consisting of one element per entity tag.  Suitable for parsing
# headers like C<If-Match>, C<If-None-Match>.  You might even want to
# use it on C<ETag> and C<If-Range> entity tag values, because it will
# normalize them to the common form.
#
#  entity-tag	  = [ weak ] opaque-tag
#  weak		  = "W/"
#  opaque-tag	  = quoted-string

sub _split_etag_list
{
    my(@val) = @_;
    my @res;
    for (@val) {
        while (length) {
            my $weak = "";
	    $weak = "W/" if s,^\s*[wW]/,,;
            my $etag = "";
	    if (s/^\s*(\"[^\"\\]*(?:\\.[^\"\\]*)*\")//) {
		push(@res, "$weak$1");
            }
            elsif (s/^\s*,//) {
                push(@res, qq(W/"")) if $weak;
            }
            elsif (s/^\s*([^,\s]+)//) {
                $etag = $1;
		$etag =~ s/([\"\\])/\\$1/g;
	        push(@res, qq($weak"$etag"));
            }
            elsif (s/^\s+// || !length) {
                push(@res, qq(W/"")) if $weak;
            }
            else {
	 	die "This should not happen: '$_'";
            }
        }
   }
   @res;
}

__END__

=pod

=encoding UTF-8

=head1 NAME

HTTP::Headers::ETag

=head1 VERSION

version 6.18

=head1 AUTHOR

Gisle Aas <gisle@activestate.com>

=head1 COPYRIGHT AND LICENSE

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

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