NAME

Mail::SpamAssassin::ArchiveIterator - find and process messages one at a time

SYNOPSIS

  my $iter = Mail::SpamAssassin::ArchiveIterator->new(
    { 
      'opt_max_size' => 500 * 1024,  # 0 implies no limit
      'opt_cache' => 1,
    }
  );

  $iter->set_functions( \&wanted, sub { } );

  eval { $iter->run(@ARGV); };

  sub wanted {
    my($class, $filename, $recv_date, $msg_array) = @_;


    ...
  }

DESCRIPTION

The Mail::SpamAssassin::ArchiveIterator module will go through a set of mbox files, mbx files, and directories (with a single message per file) and generate a list of messages. It will then call the wanted_sub and result_sub functions appropriately per message.

METHODS

$item = Mail::SpamAssassin::ArchiveIterator->new( [ { opt => val, ... } ] )

Constructs a new Mail::SpamAssassin::ArchiveIterator object. You may pass the following attribute-value pairs to the constructor. The pairs are optional unless otherwise noted.

opt_max_size

A value of option opt_max_size determines a limit (number of bytes) beyond which a message is considered large and is skipped by ArchiveIterator.

A value 0 implies no size limit, all messages are examined. An undefined value implies a default limit of 500 KiB.

opt_all

Setting this option to true implicitly sets opt_max_size to 0, i.e. no limit of a message size, all messages are processes by ArchiveIterator. For compatibility with SpamAssassin versions older than 3.4.0 which lacked option opt_max_size.

opt_scanprob

Randomly select messages to scan, with a probability of N, where N ranges from 0.0 (no messages scanned) to 1.0 (all messages scanned). Default is 1.0.

This setting can be specified separately for each target.

opt_before

Only use messages which are received after the given time_t value. Negative values are an offset from the current time, e.g. -86400 = last 24 hours; or as parsed by Time::ParseDate (e.g. '-6 months')

This setting can be specified separately for each target.

opt_after

Same as opt_before, except the messages are only used if after the given time_t value.

This setting can be specified separately for each target.

opt_want_date

Set to 1 (default) if you want the received date to be filled in in the wanted_sub callback below. Set this to 0 to avoid this; it's a good idea to set this to 0 if you can, as it imposes a performance hit.

opt_skip_empty_messages

Set to 1 if you want to skip corrupt, 0-byte messages. The default is 0.

opt_cache

Set to 0 (default) if you don't want to use cached information to help speed up ArchiveIterator. Set to 1 to enable. This setting requires opt_cachedir also be set.

opt_cachedir

Set to the path of a directory where you wish to store cached information for opt_cache, if you don't want to mix them with the input files (as is the default). The directory must be both readable and writable.

wanted_sub

Reference to a subroutine which will process message data. Usually set via set_functions(). The routine will be passed 5 values: class (scalar), filename (scalar), received date (scalar), message content (array reference, one message line per element), and the message format key ('f' for file, 'm' for mbox, 'b' for mbx).

Note that if opt_want_date is set to 0, the received date scalar will be undefined.

result_sub

Reference to a subroutine which will process the results of the wanted_sub for each message processed. Usually set via set_functions(). The routine will be passed 3 values: class (scalar), result (scalar, returned from wanted_sub), and received date (scalar).

Note that if opt_want_date is set to 0, the received date scalar will be undefined.

scan_progress_sub

Reference to a subroutine which will be called intermittently during the 'scan' phase of the mass-check. No guarantees are made as to how frequently this may happen, mind you.

opt_from_regex

This setting allows for flexibility in specifying the mbox format From separator.

It defaults to the regular expression:

/^From \S+ ?(\S\S\S \S\S\S .?\d .?\d:\d\d:\d\d \d{4}|.?\d-\d\d-\d{4}_\d\d:\d\d:\d\d_)/

Some SpamAssassin programs such as sa-learn will use the configuration option 'mbox_format_from_regex' to override the default regular expression.

set_functions( \&wanted_sub, \&result_sub )

Sets the subroutines used for message processing (wanted_sub), and result reporting. For more information, see new() above.

run ( @target_paths )

Generates the list of messages to process, then runs each message through the configured wanted subroutine.

Compressed files are detected and uncompressed automatically regardless of file extension. Supported formats are gzip, bzip2, xz, lz4, lzip, lzo. Gzip is uncompressed via IO::Zlib module, others use their specific command line tool (bzip2/xz/lz4/lzip/lzop). Compressed mailbox/mbox files are not supported.

The target_paths array is expected to be either one element per path in the following format: class:format:raw_location, or a hash reference containing key-value option pairs and a 'target' key with a value in that format.

The key-value option pairs that can be used are: opt_scanprob, opt_after, opt_before. See the constructor method's documentation for more information on their effects.

run() returns 0 if there was an error (can't open a file, etc,) and 1 if there were no errors.

class

Either 'h' for ham or 's' for spam. If the class is longer than 1 character, it will be truncated. If blank, 'h' is default.

format

Specifies the format of the raw_location. dir is a directory whose files are individual messages, file a file with a single message, mbox an mbox formatted file, or mbx for an mbx formatted directory.

detect can also be used. This assumes mbox for any file whose path contains the pattern /\.mbox/i, file anything that is not a directory, or directory otherwise.

raw_location

Path to file or directory. File globbing is allowed using the standard csh-style globbing (see perldoc -f glob). ~ at the front of the value will be replaced by the HOME environment variable. Escaped whitespace is protected as well.

NOTE: ~user is not allowed.

NOTE 2: - is not allowed as a raw location. To have ArchiveIterator deal with STDIN, generate a temp file.

SEE ALSO

Mail::SpamAssassin(3) spamassassin(1) mass-check(1)