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Edit File : Util.pm \| Size : 4.96 KB
package HTTP::Headers::Util; use strict; use warnings; our $VERSION = '6.18'; use base 'Exporter'; our @EXPORT_OK=qw(split_header_words _split_header_words join_header_words); sub split_header_words { my @res = &_split_header_words; for my $arr (@res) { for (my $i = @$arr - 2; $i >= 0; $i -= 2) { $arr->[$i] = lc($arr->[$i]); } } return @res; } sub _split_header_words { my(@val) = @_; my @res; for (@val) { my @cur; while (length) { if (s/^\s(=[^\s=;,]+)//) { # 'token' or parameter 'attribute' push(@cur, $1); # a quoted value if (s/^\s=\s\"([^\"\\](?:\\.[^\"\\]))\"//) { my $val = $1; $val =~ s/\\(.)/$1/g; push(@cur, $val); # some unquoted value } elsif (s/^\s=\s([^;,\s])//) { my $val = $1; $val =~ s/\s+$//; push(@cur, $val); # no value, a lone token } else { push(@cur, undef); } } elsif (s/^\s,//) { push(@res, [@cur]) if @cur; @cur = (); } elsif (s/^\s;// \|\| s/^\s+//) { # continue } else { die "This should not happen: '$_'"; } } push(@res, \@cur) if @cur; } @res; } sub join_header_words { @_ = ([@_]) if @_ && !ref($_[0]); my @res; for (@_) { my @cur = @$_; my @attr; while (@cur) { my $k = shift @cur; my $v = shift @cur; if (defined $v) { if ($v =~ /[\x00-\x20()<>@,;:\\\"\/\[\]?={}\x7F-\xFF]/ \|\| !length($v)) { $v =~ s/([\"\\])/\\$1/g; # escape " and \ $k .= qq(="$v"); } else { # token $k .= "=$v"; } } push(@attr, $k); } push(@res, join("; ", @attr)) if @attr; } join(", ", @res); } 1; =pod =encoding UTF-8 =head1 NAME HTTP::Headers::Util - Header value parsing utility functions =head1 VERSION version 6.18 =head1 SYNOPSIS use HTTP::Headers::Util qw(split_header_words); @values = split_header_words($h->header("Content-Type")); =head1 DESCRIPTION This module provides a few functions that helps parsing and construction of valid HTTP header values. None of the functions are exported by default. The following functions are available: =over 4 =item split_header_words( @header_values ) This function will parse the header values given as argument into a list of anonymous arrays containing key/value pairs. The function knows how to deal with ",", ";" and "=" as well as quoted values after "=". A list of space separated tokens are parsed as if they were separated by ";". If the @header_values passed as argument contains multiple values, then they are treated as if they were a single value separated by comma ",". This means that this function is useful for parsing header fields that follow this syntax (BNF as from the HTTP/1.1 specification, but we relax the requirement for tokens). headers = #header header = (token \| parameter) ( [";"] (token \| parameter)) token = 1<any CHAR except CTLs or separators> separators = "(" \| ")" \| "<" \| ">" \| "@" \| "," \| ";" \| ":" \| "\" \| <"> \| "/" \| "[" \| "]" \| "?" \| "=" \| "{" \| "}" \| SP \| HT quoted-string = ( <"> *(qdtext \| quoted-pair ) <"> ) qdtext = <any TEXT except <">> quoted-pair = "\" CHAR parameter = attribute "=" value attribute = token value = token \| quoted-string Each I<header> is represented by an anonymous array of key/value pairs. The keys will be all be forced to lower case. The value for a simple token (not part of a parameter) is C<undef>. Syntactically incorrect headers will not necessarily be parsed as you would want. This is easier to describe with some examples: split_header_words('foo="bar"; port="80,81"; DISCARD, BAR=baz'); split_header_words('text/html; charset="iso-8859-1"'); split_header_words('Basic realm="\\"foo\\\\bar\\""'); will return [foo=>'bar', port=>'80,81', discard=> undef], [bar=>'baz' ] ['text/html' => undef, charset => 'iso-8859-1'] [basic => undef, realm => "\"foo\\bar\""] If you don't want the function to convert tokens and attribute keys to lower case you can call it as C<_split_header_words> instead (with a leading underscore). =item join_header_words( @arrays ) This will do the opposite of the conversion done by split_header_words(). It takes a list of anonymous arrays as arguments (or a list of key/value pairs) and produces a single header value. Attribute values are quoted if needed. Example: join_header_words(["text/plain" => undef, charset => "iso-8859/1"]); join_header_words("text/plain" => undef, charset => "iso-8859/1"); will both return the string: text/plain; charset="iso-8859/1" =back =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 __END__ #ABSTRACT: Header value parsing utility functions Back

Edit File : Util.pm | Size : 4.96 KB

package HTTP::Headers::Util;

use strict;
use warnings;

our $VERSION = '6.18';

use base 'Exporter';

our @EXPORT_OK=qw(split_header_words _split_header_words join_header_words);

sub split_header_words {
    my @res = &_split_header_words;
    for my $arr (@res) {
	for (my $i = @$arr - 2; $i >= 0; $i -= 2) {
	    $arr->[$i] = lc($arr->[$i]);
	}
    }
    return @res;
}

sub _split_header_words
{
    my(@val) = @_;
    my @res;
    for (@val) {
	my @cur;
	while (length) {
	    if (s/^\s*(=*[^\s=;,]+)//) {  # 'token' or parameter 'attribute'
		push(@cur, $1);
		# a quoted value
		if (s/^\s*=\s*\"([^\"\\]*(?:\\.[^\"\\]*)*)\"//) {
		    my $val = $1;
		    $val =~ s/\\(.)/$1/g;
		    push(@cur, $val);
		# some unquoted value
		}
		elsif (s/^\s*=\s*([^;,\s]*)//) {
		    my $val = $1;
		    $val =~ s/\s+$//;
		    push(@cur, $val);
		# no value, a lone token
		}
		else {
		    push(@cur, undef);
		}
	    }
	    elsif (s/^\s*,//) {
		push(@res, [@cur]) if @cur;
		@cur = ();
	    }
	    elsif (s/^\s*;// || s/^\s+//) {
		# continue
	    }
	    else {
		die "This should not happen: '$_'";
	    }
	}
	push(@res, \@cur) if @cur;
    }
    @res;
}

sub join_header_words
{
    @_ = ([@_]) if @_ && !ref($_[0]);
    my @res;
    for (@_) {
	my @cur = @$_;
	my @attr;
	while (@cur) {
	    my $k = shift @cur;
	    my $v = shift @cur;
	    if (defined $v) {
		if ($v =~ /[\x00-\x20()<>@,;:\\\"\/\[\]?={}\x7F-\xFF]/ || !length($v)) {
		    $v =~ s/([\"\\])/\\$1/g;  # escape " and \
		    $k .= qq(="$v");
		}
		else {
		    # token
		    $k .= "=$v";
		}
	    }
	    push(@attr, $k);
	}
	push(@res, join("; ", @attr)) if @attr;
    }
    join(", ", @res);
}

=pod

=encoding UTF-8

=head1 NAME

HTTP::Headers::Util - Header value parsing utility functions

=head1 VERSION

version 6.18

=head1 SYNOPSIS

use HTTP::Headers::Util qw(split_header_words);
  @values = split_header_words($h->header("Content-Type"));

=head1 DESCRIPTION

This module provides a few functions that helps parsing and
construction of valid HTTP header values.  None of the functions are
exported by default.

The following functions are available:

=over 4

=item split_header_words( @header_values )

This function will parse the header values given as argument into a
list of anonymous arrays containing key/value pairs.  The function
knows how to deal with ",", ";" and "=" as well as quoted values after
"=".  A list of space separated tokens are parsed as if they were
separated by ";".

If the @header_values passed as argument contains multiple values,
then they are treated as if they were a single value separated by
comma ",".

This means that this function is useful for parsing header fields that
follow this syntax (BNF as from the HTTP/1.1 specification, but we relax
the requirement for tokens).

headers           = #header
  header            = (token | parameter) *( [";"] (token | parameter))

token             = 1*<any CHAR except CTLs or separators>
  separators        = "(" | ")" | "<" | ">" | "@"
                    | "," | ";" | ":" | "\" | <">
                    | "/" | "[" | "]" | "?" | "="
                    | "{" | "}" | SP | HT

quoted-string     = ( <"> *(qdtext | quoted-pair ) <"> )
  qdtext            = <any TEXT except <">>
  quoted-pair       = "\" CHAR

parameter         = attribute "=" value
  attribute         = token
  value             = token | quoted-string

Each I<header> is represented by an anonymous array of key/value
pairs.  The keys will be all be forced to lower case.
The value for a simple token (not part of a parameter) is C<undef>.
Syntactically incorrect headers will not necessarily be parsed as you
would want.

This is easier to describe with some examples:

split_header_words('foo="bar"; port="80,81"; DISCARD, BAR=baz');
   split_header_words('text/html; charset="iso-8859-1"');
   split_header_words('Basic realm="\\"foo\\\\bar\\""');

will return

[foo=>'bar', port=>'80,81', discard=> undef], [bar=>'baz' ]
   ['text/html' => undef, charset => 'iso-8859-1']
   [basic => undef, realm => "\"foo\\bar\""]

If you don't want the function to convert tokens and attribute keys to
lower case you can call it as C<_split_header_words> instead (with a
leading underscore).

=item join_header_words( @arrays )

This will do the opposite of the conversion done by split_header_words().
It takes a list of anonymous arrays as arguments (or a list of
key/value pairs) and produces a single header value.  Attribute values
are quoted if needed.

Example:

join_header_words(["text/plain" => undef, charset => "iso-8859/1"]);
   join_header_words("text/plain" => undef, charset => "iso-8859/1");

will both return the string:

text/plain; charset="iso-8859/1"

=back

=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

__END__

#ABSTRACT: Header value parsing utility functions

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