package HTTP::Headers::Auth;
use strict;
use vars qw($VERSION);
$VERSION = "5.810";
use HTTP::Headers;
package HTTP::Headers;
BEGIN {
    # we provide a new (and better) implementations below
    undef(&www_authenticate);
    undef(&proxy_authenticate);
}
require HTTP::Headers::Util;
sub _parse_authenticate
{
    my @ret;
    for (HTTP::Headers::Util::split_header_words(@_)) {
        if (!defined($_->[1])) {
            # this is a new auth scheme
            push(@ret, lc(shift @$_) => {});
            shift @$_;
        }
        if (@ret) {
            # this a new parameter pair for the last auth scheme
            while (@$_) {
                my $k = lc(shift @$_);
                my $v = shift @$_;
                $ret[-1]{$k} = $v;
            }
        }
        else {
            # something wrong, parameter pair without any scheme seen
            # IGNORE
        }
    }
    @ret;
}
sub _authenticate
{
    my $self = shift;
    my $header = shift;
    my @old = $self->_header($header);
    if (@_) {
        $self->remove_header($header);
        my @new = @_;
        while (@new) {
            my $a_scheme = shift(@new);
            if ($a_scheme =~ /\s/) {
                # assume complete valid value, pass it through
                $self->push_header($header, $a_scheme);
            }
            else {
                my @param;
                if (@new) {
                    my $p = $new[0];
                    if (ref($p) eq "ARRAY") {
                        @param = @$p;
                        shift(@new);
                    }
                    elsif (ref($p) eq "HASH") {
                        @param = %$p;
                        shift(@new);
                    }
                }
                my $val = ucfirst(lc($a_scheme));
                if (@param) {
                    my $sep = " ";
                    while (@param) {
                        my $k = shift @param;
                        my $v = shift @param;
                        if ($v =~ /[^0-9a-zA-Z]/ || lc($k) eq "realm") {
                            # must quote the value
                            $v =~ s,([\\\"]),\\$1,g;
                            $v = qq("$v");
                        }
                        $val .= "$sep$k=$v";
                        $sep = ", ";
                    }
                }
                $self->push_header($header, $val);
            }
        }
    }
    return unless defined wantarray;
    wantarray ? _parse_authenticate(@old) : join(", ", @old);
}
sub www_authenticate    { shift->_authenticate("WWW-Authenticate", @_)   }
sub proxy_authenticate  { shift->_authenticate("Proxy-Authenticate", @_) }
1;