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=head1 NAME
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Message::Header Perl module
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=head1 DESCRIPTION
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Perl module for RFC 822/2822 message C<header>.
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=cut
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package Message::Header;
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use strict;
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use vars qw($VERSION %REG %DEFAULT);
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$VERSION = '1.00';
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use overload '@{}' => sub {shift->_delete_empty_field()->{field}},
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'""' => sub {shift->stringify};
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$REG{WSP} = qr/[\x09\x20]/;
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$REG{FWS} = qr/[\x09\x20]*/;
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$REG{M_field} = qr/^([^\x3A]+):$REG{FWS}([\x00-\xFF]*)$/;
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$REG{M_fromline} = qr/^\x3E?From$REG{WSP}+([\x00-\xFF]*)$/;
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$REG{UNSAFE_field_name} = qr/[\x00-\x20\x3A\x7F-\xFF]/;
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=head2 options
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These options can be getten/set by C<get_option>/C<set_option>
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method.
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=head3 capitalize = 0/1
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(First character of) C<field-name> is capitalized
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when C<stringify>. (Default = 1)
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=head3 fold_length = numeric value
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Length of line used to fold. (Default = 70)
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=head3 mail_from = 0/1
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Outputs "From " line (known as Un*x From, Mail-From, and so on)
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when C<stringify>. (Default = 0)
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=cut
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%DEFAULT = (
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capitalize => 1,
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fold_length => 70,
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mail_from => 0,
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);
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=head2 Message::Header->new ([%option])
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Returns new Message::Header instance. Some options can be
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specified as hash.
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=cut
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sub new ($;%) {
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my $class = shift;
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my $self = bless {option => {@_}}, $class;
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for (keys %DEFAULT) {$self->{option}->{$_} ||= $DEFAULT{$_}}
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$self;
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}
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=head2 Message::Header->parse ($header, [%option])
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Parses given C<header> and return a new Message::Header
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object. Some options can be specified as hash.
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=cut
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sub parse ($$;%) {
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my $class = shift;
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my $header = shift;
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my $self = bless {option => {@_}}, $class;
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for (keys %DEFAULT) {$self->{option}->{$_} ||= $DEFAULT{$_}}
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$header =~ s/\x0D?\x0A$REG{WSP}+/\x20/gos; ## unfold
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for my $field (split /\x0D?\x0A/, $header) {
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if ($field =~ /$REG{M_fromline}/) {
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push @{$self->{field}}, {name => 'mail-from', body => $1};
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} elsif ($field =~ /$REG{M_field}/) {
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my ($name, $body) = ($1, $2);
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$name =~ s/$REG{WSP}+$//;
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$body =~ s/$REG{WSP}+$//;
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push @{$self->{field}}, {name => lc $name, body => $body};
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}
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}
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$self;
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}
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=head2 $self->field ($field_name)
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Returns C<field-body> of given C<field-name>.
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When there are two or more C<field>s whose name is C<field-name>,
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this method return all C<field-body>s as array. (On scalar
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context, only first one is returned.)
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=cut
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sub field ($$) {
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my $self = shift;
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my $name = lc shift;
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my @ret;
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for my $field (@{$self->{field}}) {
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if ($field->{name} eq $name) {
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unless (wantarray) {
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return $field->{body};
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} else {
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push @ret, $field->{body};
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}
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}
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}
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@ret;
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}
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=head2 $self->field_name_list ()
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Returns list of all C<field-name>s. (Even if there are two
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or more C<field>s which have same C<field-name>, this method
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returns ALL names.)
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=cut
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sub field_name_list ($) {
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my $self = shift;
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$self->_delete_empty_field ();
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map {$_->{name}} @{$self->{field}};
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}
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=head2 $self->add ($field_name, $field_body)
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Adds an new C<field>. It is not checked whether
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the field which named $field_body is already exist or not.
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If you don't want duplicated C<field>s, use C<replace> method.
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=cut
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sub add ($$$) {
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my $self = shift;
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my ($name, $body) = (lc shift, shift);
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return 0 if $name =~ /$REG{UNSAFE_field_name}/;
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push @{$self->{field}}, {name => $name, body => $body};
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$self;
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}
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=head2 $self->relace ($field_name, $field_body)
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Set the C<field-body> named C<field-name> as $field_body.
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If $field_name C<field> is already exists, it is replaced
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by new $field_body value. If not, new C<field> is inserted.
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(If there are some C<field> named as $field_name,
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first one is used and the others are not changed.)
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=cut
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sub replace ($$$) {
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my $self = shift;
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my ($name, $body) = (lc shift, shift);
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return 0 if $name =~ /$REG{UNSAFE_field_name}/;
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for my $field (@{$self->{field}}) {
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if ($field->{name} eq $name) {
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$field->{body} = $body;
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return $self;
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}
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}
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push @{$self->{field}}, {name => $name, body => $body};
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$self;
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}
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=head2 $self->delete ($field_name, [$index])
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Deletes C<field> named as $field_name.
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If $index is specified, only $index'th C<field> is deleted.
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If not, ($index == 0), all C<field>s that have the C<field-name>
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$field_name are deleted.
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=cut
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sub delete ($$;$) {
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my $self = shift;
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my ($name, $index) = (lc shift, shift);
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my $i = 0;
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for my $field (@{$self->{field}}) {
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if ($field->{name} eq $name) {
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$i++;
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if ($index == 0 || $i == $index) {
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undef $field;
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return $self if $i == $index;
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}
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}
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}
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$self;
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}
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=head2 $self->count ($field_name)
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Returns the number of times the given C<field> appears.
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=cut
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sub count ($$) {
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my $self = shift;
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my ($name) = (lc shift);
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my $count = 0;
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for my $field (@{$self->{field}}) {
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if ($field->{name} eq $name) {
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$count++;
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}
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}
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$count;
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}
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=head2 $self->stringify ([%option])
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Returns the C<header> as a string.
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=cut
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sub stringify ($;%) {
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my $self = shift;
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my %OPT = @_;
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my @ret;
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$OPT{capitalize} ||= $self->{option}->{capitalize};
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$OPT{mail_from} ||= $self->{option}->{mail_from};
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push @ret, 'From '.$self->field ('mail-from') if $OPT{mail_from};
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for my $field (@{$self->{field}}) {
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my $name = $field->{name};
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next unless $field->{name};
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next if !$OPT{mail_from} && $name eq 'mail-from';
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$name =~ s/((?:^|-)[a-z])/uc($1)/ge if $OPT{capitalize};
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push @ret, $name.': '.$self->fold ($field->{body});
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}
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join "\n", @ret;
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}
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=head2 $self->get_option ($option_name)
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Returns value of the option.
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=head2 $self->set_option ($option_name, $option_value)
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Set new value of the option.
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=cut
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sub get_option ($$) {
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my $self = shift;
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my ($name) = @_;
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$self->{option}->{$name};
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}
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sub set_option ($$$) {
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my $self = shift;
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my ($name, $value) = @_;
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$self->{option}->{$name} = $value;
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$self;
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}
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sub _delete_empty_field ($) {
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my $self = shift;
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my @ret;
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for my $field (@{$self->{field}}) {
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push @ret, $field if $field->{name};
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}
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$self->{field} = \@ret;
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$self;
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}
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sub fold ($$;$) {
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my $self = shift;
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my $string = shift;
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my $len = shift || $self->{option}->{fold_length};
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$len = 60 if $len < 60;
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## This code is taken from Mail::Header 1.43 in MailTools,
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## by Graham Barr (Maintained by Mark Overmeer <mailtools@overmeer.net>).
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my $max = int($len - 5); # 4 for leading spcs + 1 for [\,\;]
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my $min = int($len * 4 / 5) - 4;
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my $ml = $len;
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if (length($string) > $ml) {
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#Split the line up
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# first bias towards splitting at a , or a ; >4/5 along the line
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# next split a whitespace
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# else we are looking at a single word and probably don't want to split
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my $x = "";
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$x .= "$1\n "
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while($string =~ s/^$REG{WSP}*(
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[^"]{$min,$max}?[\,\;]
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|[^"]{1,$max}$REG{WSP}
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|[^\s"]*(?:"[^"]*"[^\s"]*)+$REG{WSP}
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|[^\s"]+$REG{WSP}
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)
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//x);
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$x .= $string;
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$string = $x;
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$string =~ s/(\A$REG{WSP}+|$REG{WSP}+\Z)//sog;
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$string =~ s/\s+\n/\n/sog;
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}
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$string;
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}
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=head1 EXAMPLE
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## Print field list
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use Message::Header;
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my $header = Message::Header->parse ($header);
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for my $field (@$header) {
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print $field->{name}, "\t=> ", $field->{body}, "\n";
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}
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## Make simple header
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use Message::Field::Address;
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my $header = new Message::Header;
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my $from = new Message::Field::Address;
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$from->add ('foo@foo.example', name => 'F. Foo');
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my $to = new Message::Field::Address;
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$to->add ('bar@bar.example', name => 'Mr. Bar');
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$to->add ('hoge@foo.example', name => 'Hoge-san');
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$header->add ('From' => $from);
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$header->add ('To' => $to);
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$header->add ('Subject' => 'Re: Meeting');
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$header->add ('References' => '<hoge.msgid%foo@foo.example>');
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print $header;
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=head1 LICENSE
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Copyright 2002 wakaba E<lt>w@suika.fam.cxE<gt>.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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=head1 CHANGE
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See F<ChangeLog>.
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=cut
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