github.com/go-email-validator/go-email-validator@v0.0.0-20230409163946-b8b9e6a0552e/pkg/ev/validator_mx.go (about)

     1  package ev
     2  
     3  import (
     4  	"github.com/go-email-validator/go-email-validator/pkg/ev/evsmtp"
     5  	"github.com/go-email-validator/go-email-validator/pkg/ev/utils"
     6  )
     7  
     8  // MXValidatorName  is name of mx validator
     9  const MXValidatorName ValidatorName = "MXValidator"
    10  
    11  // EmptyMXsError is error of MXValidatorName
    12  type EmptyMXsError struct{}
    13  
    14  func (EmptyMXsError) Error() string {
    15  	return "EmptyMXsError"
    16  }
    17  
    18  // MXValidationResult is result of MXValidatorName
    19  type MXValidationResult interface {
    20  	MX() evsmtp.MXs
    21  	ValidationResult
    22  }
    23  
    24  // NewMXValidationResult instantiates result of MXValidatorName
    25  func NewMXValidationResult(mx evsmtp.MXs, result *AValidationResult) MXValidationResult {
    26  	return mxValidationResult{mx: mx, AValidationResult: result}
    27  }
    28  
    29  type mxValidationResult struct {
    30  	*AValidationResult
    31  	mx evsmtp.MXs
    32  }
    33  
    34  func (v mxValidationResult) MX() evsmtp.MXs {
    35  	return v.mx
    36  }
    37  
    38  // DefaultNewMXValidator instantiates default MXValidatorName based on evsmtp.LookupMX
    39  func DefaultNewMXValidator() Validator {
    40  	return NewMXValidator(evsmtp.LookupMX)
    41  }
    42  
    43  // NewMXValidator instantiates MXValidatorName based on evsmtp.FuncLookupMX
    44  func NewMXValidator(lookupMX evsmtp.FuncLookupMX) Validator {
    45  	return mxValidator{
    46  		lookupMX: lookupMX,
    47  	}
    48  }
    49  
    50  type mxValidator struct {
    51  	AValidatorWithoutDeps
    52  	lookupMX evsmtp.FuncLookupMX
    53  }
    54  
    55  func (v mxValidator) Validate(input Input, _ ...ValidationResult) ValidationResult {
    56  	var mxs evsmtp.MXs
    57  	var err error
    58  	mxs, err = v.lookupMX(input.Email().Domain())
    59  
    60  	if hasMXs := len(mxs) > 0; err == nil && !hasMXs {
    61  		err = EmptyMXsError{}
    62  	}
    63  
    64  	return NewMXValidationResult(
    65  		mxs,
    66  		NewResult(err == nil, utils.Errs(err), nil, MXValidatorName).(*AValidationResult),
    67  	)
    68  }