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Man Pages


Manual Reference Pages  -  MAIL::SPF::RESULT (3)

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NAME

Mail::SPF::Result - SPF result class

CONTENTS

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 (...) {
            $server->throw_result(pass, $request)
        }
        else {
            $server->throw_result(permerror, $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_name     = $result->name;
    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 <B>Mail::SPF::ResultB> 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:
<B>new($server, B>$request<B>)B>: returns Mail::SPF::Result
<B>new($server, B>$request<B>, B>$text<B>)B>: 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:
<B>throw($server, B>$request<B>)B>: throws Mail::SPF::Result
<B>throw($server, B>$request<B>, B>$text<B>)B>: 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.

Note: Do not write code invoking throw on literal result class names as this would ignore any derivative result classes provided by <B>Mail::SPFB> extension modules. Invoke the throw_result method on a Mail::SPF::Server object instead.

<B>nameB>: returns string Abstract. Returns the result name of the result class (or object). For classes of the Mail::SPF::Result::* hierarchy, this roughly corresponds to the trailing part of the class name. For example, returns neutral-by-default if invoked on Mail::SPF::Result::NeutralByDefault. Also see the code method. This method may also be used as an instance method.

This method must be implemented by sub-classes of Mail::SPF::Result for which the result name differs from the result code.

<B>classB>: returns class
<B>class($name)B>: returns class Maps the given result name to the corresponding Mail::SPF::Result::* class, or returns the result base class (the class on which it is invoked) if no result name is given. If an unknown result name is specified, returns <B>undefB>.
<B>isa_by_name($name)B>: returns boolean If the class (or object) on which this method is invoked represents the given result name (or a derivative name), returns <B>trueB>. Returns <B>falseB> otherwise. This method may also be used as an instance method.

For example, Mail::SPF::Result::NeutralByDefault->isa_by_name(neutral) returns <B>trueB>.

<B>codeB>: returns string Abstract. Returns the basic SPF result code ("pass", "fail", "softfail", "neutral", "none", "error", "permerror", "temperror") of the result class on which it is invoked. All valid result codes are valid result names as well, the reverse however does not apply. This method may also be used as an instance method.

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

<B>is_code($code)B>: returns boolean If the class (or object) on which this method is invoked represents the given result code, returns <B>trueB>. Returns <B>falseB> otherwise. This method may also be used as an instance method.

Note: The isa_by_name method provides a superset of this method’s functionality.

<B>received_spf_header_nameB>: returns string Returns <B>’Received-SPF’B> as the field name for Received-SPF header fields. This method should be overridden by <B>Mail::SPFB> extension modules that provide non-standard features (such as local policy) with the capacity to dilute the purity of SPF results, in order not to deceive users of the header field into mistaking it as an indication of a natural SPF result.

    Instance methods

The following instance methods are provided:
<B>throwB>: throws Mail::SPF::Result
<B>throw($server, B>$request<B>)B>: throws Mail::SPF::Result
<B>throw($server, B>$request<B>, B>$text<B>)B>: 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.
<B>serverB>: returns Mail::SPF::Server Returns the Mail::SPF server object that produced the result at hand.
<B>requestB>: returns Mail::SPF::Request Returns the SPF request that led to the result at hand.
<B>textB>: returns string Returns the text message of the result object.
<B>stringifyB>: 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.
<B>local_explanationB>: 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.

<B>received_spf_headerB>: 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:
o Mail::SPF::Result::Pass
o Mail::SPF::Result::Fail
o Mail::SPF::Result::SoftFail
o Mail::SPF::Result::Neutral
o 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.

o Mail::SPF::Result::None
o Mail::SPF::Result::Error
o Mail::SPF::Result::PermError
o Mail::SPF::Result::TempError
The following result classes have additional functionality:
Mail::SPF::Result::Fail The following additional instance method is provided:
<B>authority_explanationB>: 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.

SEE ALSO

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

<http://tools.ietf.org/html/rfc4408>

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

AUTHORS

Julian Mehnle <julian@mehnle.net>
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perl v5.20.3 MAIL::SPF::RESULT (3) 2016-04-03

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