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Mail-MboxParser-0.31
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/ Mail::MboxParser::Mail

NAME

Mail::MboxParser::Mail - Provide mail-objects and methods upon

SYNOPSIS

See Mail::MboxParser for examples on usage.

DESCRIPTION

Mail::MboxParser::Mail objects are usually not created directly though, in theory, they could be. A description of the provided methods can be found in Mail::MboxParser.

However, go on reading if you want to use methods from MIME::Entity and learn about overloading.

METHODS

new(header, body)

This is usually not called directly but instead by get_messages(). You could however create a mail-object manually providing the header and body each as either one string or as an array-ref representing the lines.

Returns the mail-header as a hash-ref with header-fields as keys. All keys are turned to lower-case, so $header{Subject} has to be written as $header{subject}.

from_line

Returns the "From "-line of the message.

trace

This method returns the "Received: "-lines of the message as a list.

body
body(n)

Returns a Mail::MboxParser::Mail::Body object. For methods upon that see further below. When called with the argument n, the n-th body of the message is retrieved. That is, the body of the n-th entity.

Sets $message->error if something went wrong.

find_body

This will return an index number that represents what Mail::MboxParser considers to be the actual (main)-body of an email. This is useful if you don't know about the structure of a message but want to retrieve the message's signature for instance:

$signature = $msg->body($msg->find_body)->signature;

Changes are good that find_body does what it is supposed to do.

make_convertable

Returns a Mail::MboxParser::Mail::Convertable object. For details on what you can do with it, read Mail::MboxParser::Mail::Convertable.

get_field(headerfield)

Returns the specified raw field from the message header, that is: no transformation or decoding is done. Returns multiple lines as needed if the field is "Received" or another multi-line field. Not case sensitive. Sets $mail->error() if the field was not found in which case get_field() returns undef.

from

Returns a hash-ref with the two fields 'name' and 'email'. Returns undef if empty. The name-field does not necessarily contain a value either. Example:

print $mail->from->{email};
to

Returns an array of hash-references of all to-fields in the mail-header. Fields are the same as those of $mail->from. Example:

for my $recipient ($mail->to) {
	print $recipient->{name} || "<no name>", "\n";
	print $recipient->{email};
}
cc

Identical with to() but returning the hash-refed "Cc: "-line.

id

Returns the message-id of a message cutting off the leading and trailing '<' and '>' respectively.

num_entities

Returns the number of MIME-entities. That is, the number of sub-entitities actually. If 0 is returned and you think this is wrong, check $mail->log.

get_entities
get_entities(n)

Either returns an array of all MIME::Entity objects or one particular if called with a number. If no entity whatsoever could be found, an empty list is returned.

$mail->log instantly called after get_entities will give you some information of what internally may have failed. If set, this will be an error raised by MIME::Entity but you don't need to worry about it at all. It's just for the record.

get_entity_body(n)

Returns the body of the n-th MIME::Entity as a single string, undef otherwise in which case you could check $mail->error.

store_entity_body(n, handle => FILEHANDLE)

Stores the stringified body of n-th entity to the specified filehandle. That's basically the same as:

my $body = $mail->get_entity_body(0);
print FILEHANDLE $body;

and could be shortened to this:

$mail->store_entity_body(0, handle => \*FILEHANDLE);

It returns a true value on success and undef on failure. In this case, examine the value of $mail->error since the entity you specified with 'n' might not exist.

store_attachment(n)
store_attachment(n, options)

It is really just a call to store_entity_body but it will take care that the n-th entity really is a saveable attachment. That is, it wont save anything with a MIME-type of, say, text/html or so.

Unless further 'options' have been given, an attachment (if found) is stored into the current directory under the recommended filename given in the MIME-header. 'options' are specified in key/value pairs:

key:       | value:        | description:
===========|===============|===============================
path       | relative or   | directory to store attachment
(".")      | absolute      |
           | path          |
-----------|---------------|-------------------------------
store_only | a compiled    | store only files whose file
           | regex-pattern | names match this pattern
-----------|---------------|-------------------------------
code       | an anonym     | first argument will be the 
           | subroutine    | $msg-object, second one the 
           |               | index-number of the current
           |               | MIME-part
           |               | should return a filename for
           |               | the attachment
-----------|---------------|-------------------------------
args       | additional    | this array-ref will be passed  
           | arguments as  | on to the 'code' subroutine
           | array-ref     | as a dereferenced array

Example:

	$msg->store_attachment(1, 
                           path => "/home/ethan/", 
                           code => sub {
                                       my ($msg, $n, @args) = @_;
                                       return $msg->id."+$n";
                                       },
                           args => [ "Foo", "Bar" ]);

This will save the attachment found in the second entity under the name that consists of the message-ID and the appendix "+1" since the above code works on the second entity (that is, with index = 1). 'args' isn't used in this example but should demonstrate how to pass additional arguments. Inside the 'code' sub, @args equals ("Foo", "Bar").

If 'path' does not exist, it will try to create the directory for you.

You can specify to save only files matching a certain pattern. To do that, use the store-only switch:

$msg->store_attachment(1, path       => "/home/ethan/", 
                          store_only => qr/\.jpg$/i);

The above will only save files that end on '.jpg', not case-sensitive. You could also use a non-compiled pattern if you want, but that would make for instance case-insensitive matching a little cumbersome:

store_only => '(?i)\.jpg$'

Returns the filename under which the attachment has been saved. undef is returned in case the entity did not contain a saveable attachement, there was no such entity at all or there was something wrong with the 'path' you specified. Check $mail->error to find out which of these possibilities appliy.

store_all_attachments
store_all_attachments(options)

Walks through an entire mail and stores all apparent attachments. 'options' are exactly the same as in store_attachement() with the same behaviour if no options are given.

Returns a list of files that has been succesfully saved and an empty list if no attachment could be extracted.

$mail->error will tell you possible failures and a possible explanation for that.

get_attachments
get_attachments(file)

This method returns a mapping from attachment-names (if those are savable) to index-numbers of the MIME-part that represents this attachment. It returns a hash-reference, the file-names being the key and the index the value:

my $mapping = $msg->get_attachments;
for my $filename (keys %$mapping) {
    print "$filename => $mapping->{$filename}\n";
}

If called with a string as argument, it tries to look up this filename. If it can't be found, undef is returned. In this case you also should have an error-massage patiently awaiting you in the return value of $msg->error().

Even though it looks tempting, don't do the following:

# BAD!

for my $file (qw/file1.ext file2.ext file3.ext file4.ext/) {
    print "$file is in message" 
        if defined $msg->get_attachments($file);
}

The reason is that get_attachments is currently *not* optimized to cache the filename mapping. So, each time you call it on (even the same) message, it will scan it from beginning to end. Better would be:

# GOOD!

my $mapping = $msg->get_attachments;
for my $file (qw/file1.ext file2.ext file3.ext file4.ext/) {
    print "$file is in message", $msg->id, "\n" 
        if exists $mapping->{$file};
}

EXTERNAL METHODS

Mail::MboxParser::Mail implements an autoloader that will do the appropriate type-casts for you if you invoke methods from external modules. This, however, currently only works with MIME::Entity. Support for other modules will follow. Example:

my $mb = Mail::MboxParser->new("/home/user/Mail/received");
for my $msg ($mb->get_messages) {
	print $msg->effective_type, "\n";
}

effective_type() is not implemented by Mail::MboxParser::Mail and thus the corresponding method of MIME::Entity is automatically called.

To learn about what methods might be useful for you, you should read the "Access"-part of the section "PUBLIC INTERFACE" in the MIME::Entity manpage. It may become handy if you have mails with a lot of MIME-parts and you not just want to handle binary-attachments but any kind of MIME-data.

OVERLOADING

Mail::MboxParser::Mail overloads the " " operator. Overloading operators is a fancy feature of Perl and some other languages (C++ for instance) which will change the behaviour of an object when one of those overloaded operators is applied onto it. Here you get the stringified mail when you write "$mail" while otherwise you'd get the stringified reference: Mail::MboxParser::Mail=HASH(...).

VERSION

This is version 0.31.

AUTHOR AND COPYRIGHT

Tassilo von Parseval <tassilo.parseval@post.rwth-aachen.de>

Copyright (c) 2001-2002 Tassilo von Parseval. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO

MIME::Entity

Mail::MboxParser, Mail::MboxParser::Mail::Body, Mail::MboxParser::Mail::Convertable