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Mail::SPF::Mod(3)                    User Contributed Perl Documentation                   Mail::SPF::Mod(3)



NAME
       Mail::SPF::Mod - SPF record modifier base class

DESCRIPTION
       An object of class Mail::SPF::Mod represents a modifier within an SPF record.  Mail::SPF::Mod cannot
       be instantiated directly.  Create an instance of a concrete sub-class instead.

   Constructors
       The following constructors are provided:

       new(%options): returns Mail::SPF::Mod
           Abstract.  Creates a new SPF record modifier object.

           %options is a list of key/value pairs representing any of the following options:

           text
               A string denoting the unparsed text of the modifier.

           name
               A string denoting the name of the modifier.  Required if a generic Mail::SPF::Mod object (as
               opposed to a specific sub-class) is being constructed.

           domain_spec
               Either a plain string or a Mail::SPF::MacroString object denoting an optional "domain-spec"
               parameter of the mechanism.

       new_from_string($text, %options): returns Mail::SPF::Mod; throws Mail::SPF::ENothingToParse,
       Mail::SPF::EInvalidMod
           Abstract.  Creates a new SPF record modifier object by parsing the string and any options given.

   Class methods
       The following class methods are provided:

       name_pattern: returns Regexp
           Returns a regular expression that matches any legal modifier name.

   Instance methods
       The following instance methods are provided:

       text: returns string; throws Mail::SPF::ENoUnparsedText
           Returns the unparsed text of the modifier.  Throws a Mail::SPF::ENoUnparsedText exception if the
           modifier was created synthetically instead of being parsed, and no text was provided.

       name: returns string
           Returns the name of the modifier.

       params: returns string
           Abstract.  Returns the modifier's parameters formatted as a string.

           A sub-class of Mail::SPF::Mod does not have to implement this method if it supports no
           parameters, although this is highly unlikely.

       stringify: returns string
           Formats the modifier's name and parameters as a string and returns it.  You can simply use a
           Mail::SPF::Mod object as a string for the same effect, see "OVERLOADING".

       process: throws Mail::SPF::Result, Mail::SPF::Result::Error, Mail::SPF::Exception
           Abstract.  Processes the modifier.  What that means depends on the actual implementation in sub-classes. subclasses.
           classes.  See "MODIFIER TYPES" below.

           This method is abstract and must be implemented by sub-classes of Mail::SPF::Mod.

MODIFIER TYPES
       There are different basic types of modifiers, which are described below.  All of them are provided by
       the Mail::SPF::Mod module.

   Global modifiers - Mail::SPF::GlobalMod
       SPFv1 (RFC 4408) only knows "global" modifiers.  A global modifier may appear anywhere in an SPF
       record, but only once.  During evaluation of the record, global modifiers are processed after the
       last mechanism has been evaluated and an SPF result has been determined.

       The following additional class method is provided by Mail::SPF::GlobalMod:

       precedence: returns real
           Abstract.  Returns a real number between 0 and 1 denoting the precedence of the type of the
           global modifier.  Global modifiers present in an SPF record are processed in the order of their
           precedence values, 0 meaning "first".

           This method is abstract and must be implemented by sub-classes of Mail::SPF::GlobalMod.

       The following specific instance method is provided by Mail::SPF::GlobalMod:

       process($server, $request, $result): throws Mail::SPF::Result
           Abstract.  Processes the modifier.  What that means depends on the actual implementation in sub-classes. subclasses.
           classes.  Takes both a Mail::SPF::Server and a Mail::SPF::Request object.  As global modifiers
           are generally processed after an SPF result has already been determined, takes also the current
           Mail::SPF::Result.  If the modifier wishes to modify the SPF result, it may throw a different
           Mail::SPF::Result object.

           This method is abstract and must be implemented by sub-classes of Mail::SPF::GlobalMod.

   Positional modifiers - Mail::SPF::PositionalMod
       Sender ID (RFC 4406) introduces the concept of "positional" modifiers.  According to RFC 4406, a
       positional modifier must follow a mechanism and applies to that, and only that, mechanism.  However,
       because this definition is not very useful, and because no positional modifiers have been defined
       based on it as of yet, Mail::SPF deviates from RFC 4406 as follows:

       A positional modifier may appear anywhere in an SPF record, and it is stateful, i.e. it applies to
       all mechanisms and modifiers that follow it.  Positional modifiers are generally multiple, i.e. they
       may appear any number of times throughout the record.  During evaluation of the record, positional
       modifiers are processed at exactly the time when they are encountered by the evaluator.
       Consequently, all positional modifiers are processed before an SPF result is determined.

       The following specific instance method is provided by Mail::SPF::PositionalMod:

       process($server, $request): throws Mail::SPF::Result::Error, Mail::SPF::Exception
           Abstract.  Processes the modifier.  What that means depends on the actual implementation in sub-classes. subclasses.
           classes.  Takes both a Mail::SPF::Server and a Mail::SPF::Request object.  As global modifiers
           are generally processed before an SPF result has been determined, no result object is available
           to the modifier.  The modifier can (at least at this time) not directly modify the final SPF
           result, however it may throw an exception to signal an error condition.

           This method is abstract and must be implemented by sub-classes of Mail::SPF::PositionalMod.

   Unknown modifiers - Mail::SPF::UnknownMod
       Both SPFv1 and Sender ID allow unknown modifiers to appear in SPF records in order to allow new
       modifiers to be introduced without breaking existing implementations.  Obviously, unknown modifiers
       are neither global nor positional, but they may appear any number of times throughout the record and
       are simply ignored during evaluation of the record.

       Also obviously, Mail::SPF::UnknownMod does not support a "process" method.

       The following specific instance method is provided by Mail::SPF::UnknownMod:

       params: returns string
           Returns the modifier's unparsed value as a string.

OVERLOADING
       If a Mail::SPF::Mod object is used as a string, the "stringify" method is used to convert the object
       into a string.

SEE ALSO
       Mail::SPF::Mod::Redirect, Mail::SPF::Mod::Exp

       Mail::SPF, Mail::SPF::Record, Mail::SPF::Term

       <http://www.ietf.org/rfc/rfc4408.txt>

       For availability, support, and license information, see the README file included with Mail::SPF.

AUTHORS
       Julian Mehnle <julian@mehnle.net>, Shevek <cpan@anarres.org>



perl v5.12.5                                     2013-08-25                                Mail::SPF::Mod(3)