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Mail::SPF::Result.3pm

NAME

Mail::SPF::Result - SPF result class

SYNOPSIS

For the general usage of Mail::SPF::Result objects in code that calls Mail::SPF, see Mail::SPF. For the detailed interface of Mail::SPF::Result and its derivatives, see below.

Throwing results

     package Mail::SPF::Foo;
     use Error ':try';
     use Mail::SPF::Result;
 
 

     sub foo {
         if (...) {
             throw Mail::SPF::Result::Pass($server, $request);
         }
         else {
             throw Mail::SPF::Result::PermError($server, $request, 'Invalid foo');
         }
     }
 
 

Catching results

     package Mail::SPF::Bar;
     use Error ':try';
     use Mail::SPF::Foo;
 
 

     try {
         Mail::SPF::Foo->foo();
     }
     catch Mail::SPF::Result with {
         my ($result) = @_;
         ...
     };
 
 

Using results

     my $result_code     = $result->code;
     my $request         = $result->request;
     my $local_exp       = $result->local_explanation;
     my $authority_exp   = $result->authority_explanation
         if $result->can('authority_explanation');
     my $spf_header      = $result->received_spf_header;
 
 

DESCRIPTION

An object of class Mail::SPF::Result represents the result of an SPF request.

There is usually no need to construct an SPF result object directly using the "new" constructor. Instead, use the "throw" class method to signal to the calling code that a definite SPF result has been determined. In other words, use Mail::SPF::Result and its derivatives just like exceptions. See Error or ``eval'' in perlfunc for how to handle exceptions in Perl.

Constructor

The following constructor is provided:

new($server, $request): returns Mail::SPF::Result

new($server, $request, $text): returns Mail::SPF::Result

Creates a new SPF result object and associates the given Mail::SPF::Server and Mail::SPF::Request objects with it. An optional result text may be specified.

Class methods

The following class methods are provided:

throw($server, $request): throws Mail::SPF::Result

throw($server, $request, $text): throws Mail::SPF::Result

Throws a new SPF result object, associating the given Mail::SPF::Server and Mail::SPF::Request objects with it. An optional result text may be specified.

name: returns string

Returns the trailing part of the name of the Mail::SPF::Result::* class on which it is invoked. For example, returns "NeutralByDefault" if invoked on Mail::SPF::Result::NeutralByDefault. This method may also be used as an instance method.

code: returns string

Returns the result code ("pass", "fail", "softfail", "neutral", "none", "error", "permerror", "permerror") of the Mail::SPF::Result::* class on which it is invoked. This method may also be used as an instance method.

class_by_code($code): returns class

Maps the given result code to the corresponding Mail::SPF::Result::* class. If an unknown result code was specified, returns undef.

is_code($code): returns boolean

If the class (or object) on which this method is invoked represents the given result code (or a derivative code), returns true. Returns false otherwise. This method may also be used as an instance method.

For example, "Mail::SPF::Result::Pass->is_code('pass')" returns true.

Instance methods

The following instance methods are provided:

throw: throws Mail::SPF::Result

throw($server, $request): throws Mail::SPF::Result

throw($server, $request, $text): throws Mail::SPF::Result

Re-throws an existing SPF result object. If Mail::SPF::Server and Mail::SPF::Request objects are specified, associates them with the result object, replacing the prior server and request objects. If a result text is specified as well, overrides the prior result text.

code: returns string

Returns the result code of the result object.

server: returns Mail::SPF::Server

Returns the Mail::SPF server object that produced the result at hand.

request: returns Mail::SPF::Request

Returns the SPF request that led to the result at hand.

text: returns string

Returns the text message of the result object.

stringify: returns string

Returns the result's name and text message formatted as a string. You can simply use a Mail::SPF::Result object as a string for the same effect, see ``OVERLOADING''.

local_explanation: returns string; throws Mail::SPF::EDNSError, Mail::SPF::EInvalidMacroString

Returns a locally generated explanation for the result.

The local explanation is prefixed with the authority domain whose sender policy is responsible for the result. If the responsible sender policy referred to another domain's policy (using the "include" mechanism or the "redirect" modifier), that other domain which is directly responsible for the result is also included in the local explanation's head. For example:

     example.com: <local-explanation>
 
 

The authority domain "example.com"'s sender policy is directly responsible for the result.

     example.com ... other.example.org: <local-explanation>
 
 

The authority domain "example.com" (directly or indirectly) referred to the domain "other.example.org", whose sender policy then led to the result.

received_spf_header: returns string

Returns a string containing an appropriate "Received-SPF" header field for the result object. The header field is not line-wrapped and contains no trailing newline character.

OVERLOADING

If a Mail::SPF::Result object is used as a string, the ``stringify'' method is used to convert the object into a string.

RESULT CLASSES

The following result classes are provided:

Mail::SPF::Result::Pass

Mail::SPF::Result::Fail

The following additional instance method is provided:

authority_explanation: returns string; throws Mail::SPF::EDNSError, Mail::SPF::EInvalidMacroString

Returns the authority domain's explanation for the result. Be aware that the authority domain may be a malicious party and thus the authority explanation should not be trusted blindly. See RFC 4408, 10.5, for a detailed discussion of this issue.

Mail::SPF::Result::SoftFail

Mail::SPF::Result::Neutral

Mail::SPF::Result::NeutralByDefault

This is a special-case of the "neutral" result that is thrown as a default when ``falling off'' the end of the record during evaluation. See RFC 4408, 4.7.

Mail::SPF::Result::None

Mail::SPF::Result::Error

The following sub-classes of Mail::SPF::Result::Error are provided:

Mail::SPF::Result::PermError

Mail::SPF::Result::TempError

SEE ALSO

Mail::SPF, Mail::SPF::Server, Error, ``eval'' in perlfunc

<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>