NAME¶

Mail::SpamAssassin::PerMsgStatus - per-message status (spam or not-spam)

SYNOPSIS¶

  my $spamtest = new Mail::SpamAssassin ({
    'rules_filename'      => '/etc/spamassassin.rules',
    'userprefs_filename'  => $ENV{HOME}.'/.spamassassin/user_prefs'
  });
  my $mail = $spamtest->parse();
  my $status = $spamtest->check ($mail);
  my $rewritten_mail;
  if ($status->is_spam()) {
    $rewritten_mail = $status->rewrite_mail ();
  }
  ...

DESCRIPTION¶

The Mail::SpamAssassin "check()" method returns an object of this class. This object encapsulates all the per-message state.

METHODS¶

$status->check ()

Runs the SpamAssassin rules against the message pointed to by the object.

$status->learn()

After a mail message has been checked, this method can be called. If the score is outside a certain range around the threshold, ie. if the message is judged more-or-less definitely spam or definitely non-spam, it will be fed into SpamAssassin's learning systems (currently the naive Bayesian classifier), so that future similar mails will be caught.

$score = $status->get_autolearn_points()

Return the message's score as computed for auto-learning. Certain tests are ignored:

  - rules with tflags set to 'learn' (the Bayesian rules)
  - rules with tflags set to 'userconf' (user white/black-listing rules, etc)
  - rules with tflags set to 'noautolearn'
    

Also note that auto-learning occurs using scores from either scoreset 0 or 1, depending on what scoreset is used during message check. It is likely that the message check and auto-learn scores will be different.

$score = $status->get_head_only_points()

Return the message's score as computed for auto-learning, ignoring all rules except for header-based ones.

$score = $status->get_learned_points()

Return the message's score as computed for auto-learning, ignoring all rules except for learning-based ones.

$score = $status->get_body_only_points()

Return the message's score as computed for auto-learning, ignoring all rules except for body-based ones.

$score = $status->get_autolearn_force_status()

Return whether a message's score included any rules that are flagged as autolearn_force.

$rule_names = $status->get_autolearn_force_names()

Return a list of comma separated list of rule names if a message's score included any rules that are flagged as autolearn_force.

$isspam = $status->is_spam ()

After a mail message has been checked, this method can be called. It will return 1 for mail determined likely to be spam, 0 if it does not seem spam-like.

$list = $status->get_names_of_tests_hit ()

After a mail message has been checked, this method can be called. It will return a comma-separated string, listing all the symbolic test names of the tests which were triggered by the mail.

$list = $status->get_names_of_tests_hit_with_scores_hash ()

After a mail message has been checked, this method can be called. It will return a pointer to a hash for rule & score pairs for all the symbolic test names and individual scores of the tests which were triggered by the mail.

$list = $status->get_names_of_tests_hit_with_scores ()

After a mail message has been checked, this method can be called. It will return a comma-separated string of rule=score pairs for all the symbolic test names and individual scores of the tests which were triggered by the mail.

$list = $status->get_names_of_subtests_hit ()

After a mail message has been checked, this method can be called. It will return a comma-separated string, listing all the symbolic test names of the meta-rule sub-tests which were triggered by the mail. Sub-tests are the normally-hidden rules, which score 0 and have names beginning with two underscores, used in meta rules.

If a parameter of collapsed or dbg is passed, the output will be a condensed array of sub-tests with multiple hits reduced to one entry.

If the parameter of dbg is passed, the output will be a condensed string of sub-tests with multiple hits reduced to one entry with the number of hits in parentheses. Some information is also added at the end regarding the multiple hits.

$num = $status->get_score ()

After a mail message has been checked, this method can be called. It will return the message's score.

$num = $status->get_required_score ()

After a mail message has been checked, this method can be called. It will return the score required for a mail to be considered spam.

$num = $status->get_autolearn_status ()

After a mail message has been checked, this method can be called. It will return one of the following strings depending on whether the mail was auto-learned or not: "ham", "no", "spam", "disabled", "failed", "unavailable".

It also returns is flagged with auto_learn_force, it will also include the status and the rules hit. For example: "autolearn_force=yes (AUTOLEARNTEST_BODY)"

$report = $status->get_report ()

Deliver a "spam report" on the checked mail message. This contains details of how many spam detection rules it triggered.

The report is returned as a multi-line string, with the lines separated by "\n" characters.

$preview = $status->get_content_preview ()

Give a "preview" of the content.

This is returned as a multi-line string, with the lines separated by "\n" characters, containing a fully-decoded, safe, plain-text sample of the first few lines of the message body.

$msg = $status->get_message()

Return the object representing the message being scanned.

$status->rewrite_mail ()

Rewrite the mail message. This will at minimum add headers, and at maximum MIME-encapsulate the message text, to reflect its spam or not-spam status. The function will return a scalar of the rewritten message.

The actual modifications depend on the configuration (see "Mail::SpamAssassin::Conf" for more information).

The possible modifications are as follows:

$status->action_depends_on_tags($tags, $code, @args)

Enqueue the supplied subroutine reference $code, to become runnable when all the specified tags become available. The $tags may be a simple scalar - a tag name, or a listref of tag names. The subroutine &$code when called will be passed a "permessagestatus" object as its first argument, followed by the supplied (optional) list @args .

$status->set_tag($tagname, $value)

Set a template tag, as used in "add_header", report templates, etc. This API is intended for use by plugins. Tag names will be converted to an all-uppercase representation internally.

$value can be a simple scalar (string or number), or a reference to an array, in which case the public method get_tag will join array elements using a space as a separator, returning a single string for backward compatibility.

$value can also be a subroutine reference, which will be evaluated each time the template is expanded. The first argument passed by get_tag to a called subroutine will be a PerMsgStatus object (this module's object), followed by optional arguments provided a caller to get_tag.

Note that perl supports closures, which means that variables set in the caller's scope can be accessed inside this "sub". For example:

    my $text = "hello world!";
    $status->set_tag("FOO", sub {
              my $pms = shift;
              return $text;
            });
    

See "Mail::SpamAssassin::Conf"'s "TEMPLATE TAGS" section for more details on how template tags are used.

"undef" will be returned if a tag by that name has not been defined.

$string = $status->get_tag($tagname)

Get the current value of a template tag, as used in "add_header", report templates, etc. This API is intended for use by plugins. Tag names will be converted to an all-uppercase representation internally. See "Mail::SpamAssassin::Conf"'s "TEMPLATE TAGS" section for more details on tags.

"undef" will be returned if a tag by that name has not been defined.

$string = $status->get_tag_raw($tagname, @args)

Similar to "get_tag", but keeps a tag name unchanged (does not uppercase it), and does not convert arrayref tag values into a single string.

$status->set_spamd_result_item($subref)

Set an entry for the spamd result log line. $subref should be a code reference for a subroutine which will return a string in 'name=VALUE' format, similar to the other entries in the spamd result line:

  Jul 17 14:10:47 radish spamd[16670]: spamd: result: Y 22 - ALL_NATURAL,
  DATE_IN_FUTURE_03_06,DIET_1,DRUGS_ERECTILE,DRUGS_PAIN,
  TEST_FORGED_YAHOO_RCVD,TEST_INVALID_DATE,TEST_NOREALNAME,
  TEST_NORMAL_HTTP_TO_IP,UNDISC_RECIPS scantime=0.4,size=3138,user=jm,
  uid=1000,required_score=5.0,rhost=localhost,raddr=127.0.0.1,
  rport=33153,mid=<9PS291LhupY>,autolearn=spam
    

"name" and "VALUE" must not contain "=" or "," characters, as it is important that these log lines are easy to parse.

The code reference will be called by spamd after the message has been scanned, and the "PerMsgStatus::check()" method has returned.

$status->finish ()

Indicate that this $status object is finished with, and can be destroyed.

If you are using SpamAssassin in a persistent environment, or checking many mail messages from one "Mail::SpamAssassin" factory, this method should be called to ensure Perl's garbage collection will clean up old status objects.

$name = $status->get_current_eval_rule_name()

Return the name of the currently-running eval rule. "undef" is returned if no eval rule is currently being run. Useful for plugins to determine the current rule name while inside an eval test function call.

$status->get_decoded_body_text_array ()

Returns the message body, with base64 or quoted-printable encodings decoded, and non-text parts or non-inline attachments stripped.

This is the same result text as used in 'rawbody' rules.

It is returned as an array of strings, with each string being a 2-4kB chunk of the body, split from boundaries if possible.

$status->get_decoded_stripped_body_text_array ()

Returns the message body, decoded (as described in get_decoded_body_text_array()), with HTML rendered, and with whitespace normalized.

This is the same result text as used in 'body' rules.

It will always render text/html.

It is returned as an array of strings, with each string representing one 'paragraph'. Paragraphs, in plain-text mails, are double-newline-separated blocks of multi-line text.

$status->get (header_name [, default_value])

Returns a message header, pseudo-header, real name or address. "header_name" is the name of a mail header, such as 'Subject', 'To', etc. If "default_value" is given, it will be used if the requested "header_name" does not exist.

Appending ":raw" to the header name will inhibit decoding of quoted-printable or base-64 encoded strings.

Appending a modifier ":addr" to a header field name will cause everything except the first email address to be removed from the header field. It is mainly applicable to header fields 'From', 'Sender', 'To', 'Cc' along with their 'Resent-*' counterparts, and the 'Return-Path'. For example, all of the following will result in "example@foo":

$status->get_uri_list ()

Returns an array of all unique URIs found in the message. It takes a combination of the URIs found in the rendered (decoded and HTML stripped) body and the URIs found when parsing the HTML in the message. Will also set $status->{uri_list} (the array as returned by this function).

The returned array will include the "raw" URI as well as "slightly cooked" versions. For example, the single URI 'http://%77w%77.example.com/' will get turned into: ( 'http://%77w%77.example.com/', 'http://www.example.com/' )

$status->get_uri_detail_list ()

Returns a hash reference of all unique URIs found in the message and various data about where the URIs were found in the message. It takes a combination of the URIs found in the rendered (decoded and HTML stripped) body and the URIs found when parsing the HTML in the message. Will also set $status->{uri_detail_list} (the hash reference as returned by this function).

The hash format looks something like this:

  raw_uri => {
    types => { a => 1, img => 1, parsed => 1, domainkeys => 1,
               unlinked => 1, schemeless => 1 },
    cleaned => [ canonicalized_uri ],
    anchor_text => [ "click here", "no click here" ],
    domains => { domain1 => 1, domain2 => 1 },
    hosts => { host1 => domain1, host2 => domain2 },
  }
    

"raw_uri" is whatever the URI was in the message itself (http://spamassassin.apache%2Eorg/). Uris parsed from text will be prefixed with scheme if missing (http://, mailto: etc). HTML uris are as found.

"types" is a hash of the HTML tags (lowercase) which referenced the raw_uri. parsed is a faked type which specifies that the raw_uri was seen in the rendered text. domainkeys is defined when raw_uri was found from DK/DKIM d= field. unlinked is defined when it's assumed that MUA will not linkify uri (found in body without scheme or www. prefix). schemeless is always added for uris without scheme, regardless of linkifying (i.e. email address found in body without mailto:).

"cleaned" is an array of the raw and canonicalized version of the raw_uri (http://spamassassin.apache%2Eorg/, https://spamassassin.apache.org/).

"anchor_text" is an array of the anchor text (text between <a> and </a>), if any, which linked to the URI.

"domains" is a hash of the domains found in the canonicalized URIs.

"hosts" is a hash of unstripped hostnames found in the canonicalized URIs as hash keys, with their domain part stored as a value of each hash entry.

$status->add_uri_detail_list ($raw_uri, $types, $source, $valid_domain)

Adds values to internal uri_detail_list. When used from Plugins, recommended to call from parsed_metadata (along with register_method_priority, -10) so other Plugins calling get_uri_detail_list() will see it.

"raw_uri" is the URI to be added. The only required parameter.

"types" is an optional hash reference, contents are added to uri_detail_list->{types} (see get_uri_detail_list for known keys). parsed is default is no hash given. nocanon does not run uri_list_canonicalize (no redirector, uri fixing). noclean skips adding uri_detail_list->{cleaned}, so it would not be used in "uri" rule checks, but domain/hosts would still be used for URIBL/RBL purposes.

"source" is an optional simple string, only used for debug logging purposes to identify where uri originates from (default: "parsed").

"valid_domain" is an optional boolean (0/1). If true, uri will not be added unless hostname/domain is in valid format and contains a valid TLD. (default: 0)

$status->clear_test_state()

Clear test state, including test log messages from "$status->test_log()".

$status->got_hit ($rulename, $desc_prepend [, name => value, ...])

Register a hit against a rule in the ruleset.

There are two mandatory arguments. These are $rulename, the name of the rule that fired, and $desc_prepend, which is a short string that will be prepended to the rules "describe" string in output reports.

In addition, callers can supplement that with the following optional data:

$status->create_fulltext_tmpfile (fulltext_ref)

This function creates a temporary file containing the passed scalar reference data (typically the full/pristine text of the message). This is typically used by external programs like pyzor and dccproc, to avoid hangs due to buffering issues. Methods that need this, should call $self->create_fulltext_tmpfile($fulltext) to retrieve the temporary filename; it will be created if it has not already been.

Note: This can only be called once until $status->delete_fulltext_tmpfile() is called.

$status->delete_fulltext_tmpfile ()

Will cleanup after a $status->create_fulltext_tmpfile() call. Deletes the temporary file and uncaches the filename.

all_from_addrs_domains

This function returns all the various from addresses in a message using all_from_addrs() and then returns only the domain names.

SEE ALSO¶

Mail::SpamAssassin(3) spamassassin(1)